fix typo in file name

site: fetch latest version client-side instead of embedding at build time (#2072 )
* site: fetch latest version client-side instead of embedding at build time The header version badge was filled in by site/src/data/github.js calling the GitHub releases API at Eleventy build time and baking data[0].tag_name into every page. This had three failure modes: 1. Layered cache: Buildx caches the yarn build layer; on a release-triggered workflow nothing under ./site changes, so the cached HTML (with the previous tag baked in) gets shipped. v1.16.0 went out and remark42.com kept showing v1.15.0 until a separate site/ commit landed and naturally invalidated the COPY layer. 2. Tag mismatch: the deploy pulls ghcr.io/umputun/remark42-site:master, but release events build :v1.16.0 and :latest only. A cache-skip workflow tweak wouldn't even reach the served image. 3. API propagation race: the workflow fires ~2s after release publish, so even with cache disabled the API might still return the previous tag from a stale read replica. All three vanish if the version is fetched in the browser. GitHub serves the /releases/latest response with Cache-Control: public, max-age=60 so per-visitor cost is bounded; failures fall through silently and the badge stays empty rather than wrong. Changes: - header.njk: replace {{ github.latestVersion }} with a <span data-remark42-version></span> placeholder. - inline.js: add a fetch of /releases/latest that fills any [data-remark42-version] element on the page. fallback is no-op on any network/parse failure. - delete site/src/data/github.js (Eleventy data file is no longer used). - drop node-fetch from devDependencies (was used only by github.js). * site: address PR review on version badge fetch - gate DOM update on DOMContentLoaded — inline.js is loaded sync in <head>, so a cache-hit fetch can resolve before the placeholder span is parsed. - hide placeholder span by default (`hidden`) so a failed/blocked fetch doesn't leave a 0.5rem stray gap before the github icon. - log fetch failures (rate limit, offline, blocked) instead of silently swallowing — matches the prior behaviour of build-time github.js. * site: cache latest version in sessionStorage with 1h TTL avoids hitting the GitHub API on every page load — repeated navigations within a tab read from sessionStorage instead. TTL caps stale display at 1h for very long-lived tabs. cleared on tab close, so each new session fetches once and reuses the result throughout. * site: address PR review on header & version fetch Copilot review on the cache commit raised three points: 1. inline.js had a hard-coded `https://api.github.com/repos/umputun/remark42` while the templates use `site.githubUrl`. Rename inline.js → inline.njk so nunjucks evaluates it, add `githubApiUrl` to site.json, and template the fetch URL from it. One place to update if the repo ever moves. 2. header.njk aria-label said "Remark42's GitHub Repository" but the link target is `/releases`. Change to "{{ site.name }} releases on GitHub" so screen readers describe the actual destination. 3. console.warn on fetch failure (kept after umputun's prior review noted the trade-off): addressed in the PR description, no code change. * site: actually template fetch URL via site.githubApiUrl Copilot's second pass caught that 7697dcf3 added site.githubApiUrl, renamed inline.js → inline.njk, and pointed head.njk at the .njk file — but the fetch() call itself was never changed to use the template variable. Build output looked correct because the literal hard-coded URL happened to match what {{ site.githubApiUrl }} would expand to. * site: normalise Nunjucks spacing in header.njk {{ site.githubUrl}}/releases → {{ site.githubUrl }}/releases. Cosmetic only; matches the spacing used everywhere else in the templates.
2026-05-28 17:53:37 -05:00 · 2026-05-28 13:10:35 -05:00 · 2026-05-28 13:02:25 -05:00 · 2026-05-28 12:56:33 -05:00 · 2026-05-26 14:12:07 -05:00 · 2026-05-22 16:15:37 -05:00
2280 changed files with 173844 additions and 179819 deletions
@@ -0,0 +1,72 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    groups:
+      "GitHub Actions updates":
+        patterns:
+          - "*"
+  - package-ecosystem: "gomod"
+    directory: "/backend"
+    schedule:
+      interval: "monthly"
+    groups:
+      "Go modules updates":
+        dependency-type: "production"
+  - package-ecosystem: "npm"
+    directory: "/frontend"
+    open-pull-requests-limit: 0
+    schedule:
+      interval: "monthly"
+    groups:
+      "NPM modules updates":
+        dependency-type: "production"
+      "NPM modules updates for tests":
+        dependency-type: "development"
+  - package-ecosystem: "npm"
+    directory: "/frontend/packages/api"
+    open-pull-requests-limit: 0
+    schedule:
+      interval: "monthly"
+    groups:
+      "NPM modules updates":
+        dependency-type: "production"
+      "NPM modules updates for tests":
+        dependency-type: "development"
+  - package-ecosystem: "npm"
+    directory: "/frontend/e2e"
+    open-pull-requests-limit: 0
+    schedule:
+      interval: "monthly"
+    groups:
+      "NPM modules updates":
+        dependency-type: "production"
+      "NPM modules updates for tests":
+        dependency-type: "development"
+  - package-ecosystem: "npm"
+    directory: "/frontend/apps/remark42"
+    open-pull-requests-limit: 0
+    schedule:
+      interval: "monthly"
+    groups:
+      "NPM modules updates":
+        dependency-type: "production"
+      "NPM modules updates for tests":
+        dependency-type: "development"
+  - package-ecosystem: "npm"
+    directory: "/site"
+    open-pull-requests-limit: 0
+    schedule:
+      interval: "monthly"
+    groups:
+      "NPM modules updates":
+        dependency-type: "production"
+      "NPM modules updates for tests":
+        dependency-type: "development"
@@ -5,24 +5,29 @@ on:
    branches:
    tags:
    paths:
-      - ".github/workflows/ci-test-backend.yml"
+      - ".github/workflows/ci-backend.yml"
      - "backend/**"
      - "!backend/scripts/**"
      - "!**.md"
  pull_request:
    types: [opened, reopened]
    paths:
-      - ".github/workflows/ci-test-backend.yml"
+      - ".github/workflows/ci-backend.yml"
      - "backend/**"
      - "!backend/scripts/**"
      - "!**.md"
+
 jobs:
  test:
    name: Test & Coverage
    runs-on: ubuntu-latest
+    permissions:
+      contents: read

    steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
+        with:
+          persist-credentials: false

      - name: debug if needed
        run: if [[ "$DEBUG" == "true" ]]; then env; fi
@@ -30,9 +35,10 @@ jobs:
          DEBUG: ${{secrets.DEBUG}}

      - name: install go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v6
        with:
-          go-version: "1.20"
+          go-version: "1.25"
+          cache-dependency-path: backend

      - name: test and build backend
        run: |
@@ -52,15 +58,15 @@ jobs:
          TZ: "America/Chicago"

      - name: golangci-lint
-        uses: golangci/golangci-lint-action@v3
+        uses: golangci/golangci-lint-action@v9
        with:
-          version: latest
+          version: "v2.10.1"
          working-directory: backend/app

      - name: golangci-lint on example directory
-        uses: golangci/golangci-lint-action@v3
+        uses: golangci/golangci-lint-action@v9
        with:
-          version: latest
+          version: "v2.10.1"
          args: --config ../../.golangci.yml
          working-directory: backend/_example/memory_store

@@ -1,18 +1,6 @@
 name: build

 on:
-  push:
-    branches:
-    tags:
-    paths:
-      - ".github/workflows/ci-build.yml"
-      - "backend/**"
-      - "frontend/apps/**"
-      - ".dockerignore"
-      - "docker-init.sh"
-      - "Dockerfile"
-      - "!**.md"
-      - "!frontend/packages/**"
  pull_request:
    paths:
      - ".github/workflows/ci-build.yml"
@@ -23,79 +11,56 @@ on:
      - "Dockerfile"
      - "!**.md"

+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
  build-images:
-    name: Build Docker images
+    name: Validate Docker build
    runs-on: ubuntu-latest
+    permissions:
+      contents: read

    steps:
-      - uses: actions/checkout@v3
-
-      - name: set up QEMU
-        uses: docker/setup-qemu-action@v2
+      - uses: actions/checkout@v6
+        with:
+          persist-credentials: false

      - name: set up Docker Buildx
-        id: buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v4

-      - name: available platforms
-        run: echo ${{ steps.buildx.outputs.platforms }}
+      - name: expose GitHub Actions cache
+        uses: actions/cache@v5
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-

-      - name: build docker image without pushing (only outside master)
-        if: ${{ github.ref != 'refs/heads/master' }}
+      - name: free disk space
        run: |
-          docker buildx build \
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /opt/ghc
+          sudo rm -rf /usr/local/share/boost
+          docker system prune -af
+
+      - name: build docker image without pushing
+        run: |
+          docker buildx build --load \
+              --cache-from type=local,src=/tmp/.buildx-cache \
+              --cache-to type=local,dest=/tmp/.buildx-cache-new,mode=max \
              --build-arg SKIP_BACKEND_TEST=true --build-arg SKIP_FRONTEND_TEST=true \
              --platform linux/amd64 .

-      - name: build example docker image without pushing (only outside master)
-        if: ${{ github.ref != 'refs/heads/master' }}
+      - name: build example docker image without pushing
        run: |
-          docker buildx build \
+          docker buildx build --load \
+              --cache-from type=local,src=/tmp/.buildx-cache \
              --build-arg SKIP_BACKEND_TEST=true --build-arg SKIP_FRONTEND_TEST=true \
              --platform linux/amd64 -f backend/_example/memory_store/Dockerfile .

-      - name: build and deploy master image to ghcr.io and dockerhub
-        if: ${{ github.ref == 'refs/heads/master' }}
-        env:
-          GITHUB_PACKAGE_TOKEN: ${{ secrets.PKG_TOKEN }}
-          DOCKER_HUB_TOKEN: ${{ secrets.DOCKER_HUB_TOKEN }}
-          USERNAME: ${{ github.actor }}
-          GITHUB_SHA: ${{ github.sha}}
-          GITHUB_REF: ${{ github.ref}}
+      - name: rotate cache
        run: |
-          ref="$(echo ${GITHUB_REF} | cut -d'/' -f3)"
-          echo "GITHUB_REF=${GITHUB_REF}, GITHUB_SHA=${GITHUB_SHA}, GIT_BRANCH=${ref}"
-          echo ${GITHUB_PACKAGE_TOKEN} | docker login ghcr.io -u ${USERNAME} --password-stdin
-          echo ${DOCKER_HUB_TOKEN} | docker login -u umputun --password-stdin
-          docker buildx build --push \
-              --build-arg SKIP_BACKEND_TEST=true --build-arg SKIP_FRONTEND_TEST=true --build-arg CI=github \
-              --build-arg GITHUB_SHA=${GITHUB_SHA} --build-arg GIT_BRANCH=${ref} --build-arg GITHUB_REF=${GITHUB_REF} \
-              --platform linux/amd64,linux/arm/v7,linux/arm64 \
-              -t ghcr.io/umputun/remark42:${ref} -t umputun/remark42:${ref} .
-
-      - name: deploy tagged (latest) to ghcr.io and dockerhub
-        if: ${{ startsWith(github.ref, 'refs/tags/') }}
-        env:
-          GITHUB_PACKAGE_TOKEN: ${{ secrets.PKG_TOKEN }}
-          DOCKER_HUB_TOKEN: ${{ secrets.DOCKER_HUB_TOKEN }}
-          USERNAME: ${{ github.actor }}
-          GITHUB_SHA: ${{ github.sha}}
-          GITHUB_REF: ${{ github.ref}}
-        run: |
-          ref="$(echo ${GITHUB_REF} | cut -d'/' -f3)"
-          echo "GITHUB_REF=${GITHUB_REF}, GITHUB_SHA=${GITHUB_SHA}, GIT_BRANCH=${ref}"
-          echo ${GITHUB_PACKAGE_TOKEN} | docker login ghcr.io -u ${USERNAME} --password-stdin
-          echo ${DOCKER_HUB_TOKEN} | docker login -u umputun --password-stdin
-          docker buildx build --push \
-              --build-arg SKIP_BACKEND_TEST=true --build-arg SKIP_FRONTEND_TEST=true --build-arg CI=github \
-              --build-arg GITHUB_SHA=${GITHUB_SHA} --build-arg GIT_BRANCH=${ref} --build-arg GITHUB_REF=${GITHUB_REF} \
-              --platform linux/amd64,linux/arm/v7,linux/arm64 \
-              -t ghcr.io/umputun/remark42:${ref} -t ghcr.io/umputun/remark42:latest \
-              -t umputun/remark42:${ref} -t umputun/remark42:latest .
-
-      - name: remote deployment to remark42.com from master
-        if: ${{ github.ref == 'refs/heads/master' }}
-        env:
-          UPDATER_KEY: ${{ secrets.UPDATER_KEY }}
-        run: curl -s https://jess.umputun.com/update/remark42-core/${UPDATER_KEY}
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache || true
@@ -18,38 +18,30 @@ jobs:
  type-check:
    name: Type check
    runs-on: ubuntu-latest
+    permissions:
+      contents: read
    strategy:
      matrix:
-        node: [16.15.1]
+        node: [ 16 ]

    steps:
      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Install node
-        uses: actions/setup-node@v3
+        uses: actions/checkout@v6
        with:
-          node-version: ${{ matrix.node }}
+          persist-credentials: false

      - name: Install pnpm
-        uses: pnpm/action-setup@v2.0.1
-        id: pnpm-install
+        uses: pnpm/action-setup@v6.0.4
        with:
-          version: 7
+          version: 8
          run_install: false

-      - name: Get pnpm store directory
-        id: pnpm-cache
-        run: |
-          echo "::set-output name=pnpm_cache_dir::$(pnpm store path)"
-
-      - name: Setup pnpm cache
-        uses: actions/cache@v3
+      - name: Install node
+        uses: actions/setup-node@v6
        with:
-          path: ${{ steps.pnpm-cache.outputs.pnpm_cache_dir }}
-          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
-          restore-keys: |
-            ${{ runner.os }}-pnpm-store-
+          node-version: ${{ matrix.node }}
+          cache: "pnpm"
+          cache-dependency-path: frontend/pnpm-lock.yaml

      - name: Install dependencies
        run: pnpm i
@@ -62,38 +54,30 @@ jobs:
  lint:
    name: Lint
    runs-on: ubuntu-latest
+    permissions:
+      contents: read
    strategy:
      matrix:
-        node: [16.15.1]
+        node: [ 16 ]

    steps:
      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Install node
-        uses: actions/setup-node@v3
+        uses: actions/checkout@v6
        with:
-          node-version: ${{ matrix.node }}
+          persist-credentials: false

      - name: Install pnpm
-        uses: pnpm/action-setup@v2.0.1
-        id: pnpm-install
+        uses: pnpm/action-setup@v6.0.4
        with:
-          version: 7
+          version: 8
          run_install: false

-      - name: Get pnpm store directory
-        id: pnpm-cache
-        run: |
-          echo "::set-output name=pnpm_cache_dir::$(pnpm store path)"
-
-      - name: Setup pnpm cache
-        uses: actions/cache@v3
+      - name: Install node
+        uses: actions/setup-node@v6
        with:
-          path: ${{ steps.pnpm-cache.outputs.pnpm_cache_dir }}
-          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
-          restore-keys: |
-            ${{ runner.os }}-pnpm-store-
+          node-version: ${{ matrix.node }}
+          cache: "pnpm"
+          cache-dependency-path: frontend/pnpm-lock.yaml

      - name: Install dependencies
        run: pnpm i
@@ -106,38 +90,30 @@ jobs:
  test:
    name: Tests & Coverage
    runs-on: ubuntu-latest
+    permissions:
+      contents: read
    strategy:
      matrix:
-        node: [16.15.1]
+        node: [ 16 ]

    steps:
      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Install node
-        uses: actions/setup-node@v3
+        uses: actions/checkout@v6
        with:
-          node-version: ${{ matrix.node }}
+          persist-credentials: false

      - name: Install pnpm
-        uses: pnpm/action-setup@v2.0.1
-        id: pnpm-install
+        uses: pnpm/action-setup@v6.0.4
        with:
-          version: 7
+          version: 8
          run_install: false

-      - name: Get pnpm store directory
-        id: pnpm-cache
-        run: |
-          echo "::set-output name=pnpm_cache_dir::$(pnpm store path)"
-
-      - name: Setup pnpm cache
-        uses: actions/cache@v3
+      - name: Install node
+        uses: actions/setup-node@v6
        with:
-          path: ${{ steps.pnpm-cache.outputs.pnpm_cache_dir }}
-          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
-          restore-keys: |
-            ${{ runner.os }}-pnpm-store-
+          node-version: ${{ matrix.node }}
+          cache: "pnpm"
+          cache-dependency-path: frontend/pnpm-lock.yaml

      - name: Install dependencies
        run: pnpm i
@@ -147,7 +123,9 @@ jobs:
        run: pnpm coverage:api
        working-directory: ./frontend

-      - name: Submit coverage
-        run: ${{ github.workspace }}/frontend/apps/remark42/node_modules/.bin/codecov
-        env:
-          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v6
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          working-directory: ./frontend
+          codecov_yml_path: ./frontend/apps/remark42/codecov.yml
@@ -18,38 +18,30 @@ jobs:
  translations-check:
    name: Translations check
    runs-on: ubuntu-latest
+    permissions:
+      contents: read
    strategy:
      matrix:
-        node: [16.15.1]
+        node: [16]

    steps:
      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Install node
-        uses: actions/setup-node@v3
+        uses: actions/checkout@v6
        with:
-          node-version: ${{ matrix.node }}
+          persist-credentials: false

      - name: Install pnpm
-        uses: pnpm/action-setup@v2.0.1
-        id: pnpm-install
+        uses: pnpm/action-setup@v6.0.4
        with:
-          version: 7
+          version: 8
          run_install: false

-      - name: Get pnpm store directory
-        id: pnpm-cache
-        run: |
-          echo "::set-output name=pnpm_cache_dir::$(pnpm store path)"
-
-      - name: Setup pnpm cache
-        uses: actions/cache@v3
+      - name: Install node
+        uses: actions/setup-node@v6
        with:
-          path: ${{ steps.pnpm-cache.outputs.pnpm_cache_dir }}
-          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
-          restore-keys: |
-            ${{ runner.os }}-pnpm-store-
+          node-version: ${{ matrix.node }}
+          cache: "pnpm"
+          cache-dependency-path: frontend/pnpm-lock.yaml

      - name: Install dependencies
        run: pnpm i
@@ -62,38 +54,30 @@ jobs:
  type-check:
    name: Type check
    runs-on: ubuntu-latest
+    permissions:
+      contents: read
    strategy:
      matrix:
-        node: [16.15.1]
+        node: [16]

    steps:
      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Install node
-        uses: actions/setup-node@v3
+        uses: actions/checkout@v6
        with:
-          node-version: ${{ matrix.node }}
+          persist-credentials: false

      - name: Install pnpm
-        uses: pnpm/action-setup@v2.0.1
-        id: pnpm-install
+        uses: pnpm/action-setup@v6.0.4
        with:
-          version: 7
+          version: 8
          run_install: false

-      - name: Get pnpm store directory
-        id: pnpm-cache
-        run: |
-          echo "::set-output name=pnpm_cache_dir::$(pnpm store path)"
-
-      - name: Setup pnpm cache
-        uses: actions/cache@v3
+      - name: Install node
+        uses: actions/setup-node@v6
        with:
-          path: ${{ steps.pnpm-cache.outputs.pnpm_cache_dir }}
-          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
-          restore-keys: |
-            ${{ runner.os }}-pnpm-store-
+          node-version: ${{ matrix.node }}
+          cache: "pnpm"
+          cache-dependency-path: frontend/pnpm-lock.yaml

      - name: Install dependencies
        run: pnpm i
@@ -106,38 +90,30 @@ jobs:
  lint:
    name: Eslint & Stylelint
    runs-on: ubuntu-latest
+    permissions:
+      contents: read
    strategy:
      matrix:
-        node: [16.15.1]
+        node: [16]

    steps:
      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Install node
-        uses: actions/setup-node@v3
+        uses: actions/checkout@v6
        with:
-          node-version: ${{ matrix.node }}
+          persist-credentials: false

      - name: Install pnpm
-        uses: pnpm/action-setup@v2.0.1
-        id: pnpm-install
+        uses: pnpm/action-setup@v6.0.4
        with:
-          version: 7
+          version: 8
          run_install: false

-      - name: Get pnpm store directory
-        id: pnpm-cache
-        run: |
-          echo "::set-output name=pnpm_cache_dir::$(pnpm store path)"
-
-      - name: Setup pnpm cache
-        uses: actions/cache@v3
+      - name: Install node
+        uses: actions/setup-node@v6
        with:
-          path: ${{ steps.pnpm-cache.outputs.pnpm_cache_dir }}
-          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
-          restore-keys: |
-            ${{ runner.os }}-pnpm-store-
+          node-version: ${{ matrix.node }}
+          cache: "pnpm"
+          cache-dependency-path: frontend/pnpm-lock.yaml

      - name: Install dependencies
        run: pnpm i
@@ -151,21 +127,25 @@ jobs:
    name: Size limit
    runs-on: ubuntu-latest
    if: github.event_name == 'pull_request'
+    permissions:
+      contents: read
+      pull-requests: write
    env:
      CI_JOB_NUMBER: 1
    steps:
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false

      - name: Install pnpm
-        uses: pnpm/action-setup@v2.0.1
-        id: pnpm-install
+        uses: pnpm/action-setup@v6.0.4
        with:
-          version: 7
+          version: 8
          run_install: false

      - name: Check bundle size
-        uses: andresz1/size-limit-action@dd31dce7dcc72a041fd3e49abf0502b13fc4ce05
+        uses: andresz1/size-limit-action@94bc357df29c36c8f8d50ea497c3e225c3c95d1d
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          directory: ./frontend/apps/remark42
@@ -174,38 +154,30 @@ jobs:
  test:
    name: Tests & Coverage
    runs-on: ubuntu-latest
+    permissions:
+      contents: read
    strategy:
      matrix:
-        node: [16.15.1]
+        node: [16]

    steps:
      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Install node
-        uses: actions/setup-node@v3
+        uses: actions/checkout@v6
        with:
-          node-version: ${{ matrix.node }}
+          persist-credentials: false

      - name: Install pnpm
-        uses: pnpm/action-setup@v2.0.1
-        id: pnpm-install
+        uses: pnpm/action-setup@v6.0.4
        with:
-          version: 7
+          version: 8
          run_install: false

-      - name: Get pnpm store directory
-        id: pnpm-cache
-        run: |
-          echo "::set-output name=pnpm_cache_dir::$(pnpm store path)"
-
-      - name: Setup pnpm cache
-        uses: actions/cache@v3
+      - name: Install node
+        uses: actions/setup-node@v6
        with:
-          path: ${{ steps.pnpm-cache.outputs.pnpm_cache_dir }}
-          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
-          restore-keys: |
-            ${{ runner.os }}-pnpm-store-
+          node-version: ${{ matrix.node }}
+          cache: "pnpm"
+          cache-dependency-path: frontend/pnpm-lock.yaml

      - name: Install dependencies
        run: pnpm i
@@ -215,7 +187,9 @@ jobs:
        run: pnpm coverage
        working-directory: ./frontend/apps/remark42

-      - name: Submit coverage
-        run: ${{ github.workspace }}/frontend/apps/remark42/node_modules/.bin/codecov
-        env:
-          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v6
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          working-directory: ./frontend/apps/remark42
+          codecov_yml_path: ./frontend/apps/remark42/codecov.yml
@@ -1,10 +1,11 @@
 name: site

 on:
+  release:
+    types: [published]
  push:
    branches:
      - master
-    tags:
    paths:
      - ".github/workflows/ci-site.yml"
      - "site/**"
@@ -13,57 +14,131 @@ on:
      - ".github/workflows/ci-site.yml"
      - "site/**"

+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
  build:
-    name: Build
-    runs-on: ubuntu-latest
+    name: Build site image (${{ matrix.platform }})
+    if: github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags/')
+    runs-on: ${{ matrix.runner }}
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux/amd64
+            runner: ubuntu-latest
+            artifact: linux-amd64
+          - platform: linux/arm64
+            runner: ubuntu-24.04-arm
+            artifact: linux-arm64

    steps:
      - name: checkout
-        uses: actions/checkout@v3
-
-      - name: set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false

      - name: set up Docker Buildx
-        id: buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v4

-      - name: available platforms
-        run: echo ${{ steps.buildx.outputs.platforms }}
+      - name: login to ghcr.io
+        uses: docker/login-action@v4
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.PKG_TOKEN }}

-      - name: build and deploy master image to ghcr.io and dockerhub
-        if: ${{ github.ref == 'refs/heads/master' }}
+      - name: build and push by digest
+        id: build
+        uses: docker/build-push-action@v7
+        with:
+          context: ./site
+          platforms: ${{ matrix.platform }}
+          cache-from: type=gha,scope=site-${{ matrix.platform }}
+          cache-to: type=gha,scope=site-${{ matrix.platform }},mode=max
+          outputs: type=image,name=ghcr.io/umputun/remark42-site,push-by-digest=true,name-canonical=true,push=true
+
+      - name: export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+
+      - name: upload digest
+        uses: actions/upload-artifact@v7
+        with:
+          name: site-digests-${{ matrix.artifact }}
+          path: /tmp/digests/*
+          retention-days: 1
+
+  merge:
+    name: Create site multi-arch manifest
+    runs-on: ubuntu-latest
+    needs: build
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: download digests
+        uses: actions/download-artifact@v8
+        with:
+          path: /tmp/digests
+          pattern: site-digests-*
+          merge-multiple: true
+
+      - name: verify all digests present
+        run: |
+          expected=2
+          actual=$(find /tmp/digests -maxdepth 1 -type f | wc -l)
+          if [ "$actual" -ne "$expected" ]; then
+            echo "Expected $expected digests, found $actual"
+            ls -la /tmp/digests
+            exit 1
+          fi
+          echo "All $expected digests present"
+
+      - name: set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
+      - name: login to ghcr.io
+        uses: docker/login-action@v4
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.PKG_TOKEN }}
+
+      - name: create manifest and push
+        working-directory: /tmp/digests
        env:
-          GITHUB_PACKAGE_TOKEN: ${{ secrets.PKG_TOKEN }}
-          USERNAME: ${{ github.actor }}
-          GITHUB_SHA: ${{ github.sha}}
-          GITHUB_REF: ${{ github.ref}}
-        working-directory: ./site
+          GITHUB_REF: ${{ github.ref }}
        run: |
          ref="$(echo ${GITHUB_REF} | cut -d'/' -f3)"
-          echo GITHUB_REF - $ref
-          echo ${GITHUB_PACKAGE_TOKEN} | docker login ghcr.io -u ${USERNAME} --password-stdin
-          docker buildx build --push --no-cache --platform linux/amd64,linux/arm/v7,linux/arm64 \
-            -t ghcr.io/umputun/remark42-site:${ref} .
+          if [[ "$GITHUB_REF" == refs/tags/* ]]; then
+            docker buildx imagetools create \
+              -t ghcr.io/umputun/remark42-site:${ref} \
+              -t ghcr.io/umputun/remark42-site:latest \
+              $(printf 'ghcr.io/umputun/remark42-site@sha256:%s ' *)
+          else
+            docker buildx imagetools create \
+              -t ghcr.io/umputun/remark42-site:${ref} \
+              $(printf 'ghcr.io/umputun/remark42-site@sha256:%s ' *)
+          fi

-      - name: deploy tagged (latest) to ghcr.io and dockerhub
-        if: ${{ startsWith(github.ref, 'refs/tags/') }}
-        env:
-          GITHUB_PACKAGE_TOKEN: ${{ secrets.PKG_TOKEN }}
-          USERNAME: ${{ github.actor }}
-          GITHUB_SHA: ${{ github.sha}}
-          GITHUB_REF: ${{ github.ref}}
-        working-directory: ./site
-        run: |
-          ref="$(echo ${GITHUB_REF} | cut -d'/' -f3)"
-          echo "GITHUB_REF=$ref, GITHUB_SHA=${GITHUB_SHA}"
-          echo ${GITHUB_PACKAGE_TOKEN} | docker login ghcr.io -u ${USERNAME} --password-stdin
-          docker buildx build --push --no-cache --platform linux/amd64,linux/arm/v7,linux/arm64 \
-            -t ghcr.io/umputun/remark42-site:${ref} -t ghcr.io/umputun/remark42-site:latest .
+  deploy:
+    name: Deploy site
+    runs-on: ubuntu-latest
+    needs: merge
+    if: github.ref == 'refs/heads/master' || github.event_name == 'release'
+    permissions: {} # only calls an external URL via curl, no GitHub API access needed

-      - name: remote site deployment from master
-        if: ${{ github.ref == 'refs/heads/master' }}
+    steps:
+      - name: trigger deployment
        env:
          UPDATER_KEY: ${{ secrets.UPDATER_KEY }}
-        run: curl https://jess.umputun.com/update/remark42-site/${UPDATER_KEY}
+        run: curl -sf https://jess.umputun.com/update/remark42-site/${UPDATER_KEY}
@@ -0,0 +1,215 @@
+name: docker
+
+on:
+  workflow_run:
+    workflows: [backend]
+    types: [completed]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.workflow_run.head_branch }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Build Docker image (${{ matrix.platform }})
+    if: >-
+      github.event.workflow_run.conclusion == 'success' &&
+      github.event.workflow_run.event != 'pull_request' &&
+      (github.event.workflow_run.head_branch == 'master' ||
+       startsWith(github.event.workflow_run.head_branch, 'v'))
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux/amd64
+            runner: ubuntu-latest
+            artifact: linux-amd64
+          - platform: linux/arm64
+            runner: ubuntu-24.04-arm
+            artifact: linux-arm64
+    runs-on: ${{ matrix.runner }}
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v6
+        with:
+          ref: ${{ github.event.workflow_run.head_sha }}
+          persist-credentials: false
+
+      - name: set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
+      - name: login to ghcr.io
+        uses: docker/login-action@v4
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.PKG_TOKEN }}
+
+      - name: login to DockerHub
+        uses: docker/login-action@v4
+        with:
+          username: umputun
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+
+      - name: free disk space
+        run: |
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /opt/ghc
+          sudo rm -rf /usr/local/share/boost
+          docker system prune -af
+
+      - name: build and push to ghcr.io by digest
+        id: build-ghcr
+        uses: docker/build-push-action@v7
+        with:
+          context: .
+          platforms: ${{ matrix.platform }}
+          cache-from: type=gha,scope=${{ matrix.platform }}
+          cache-to: type=gha,scope=${{ matrix.platform }},mode=max
+          build-args: |
+            SKIP_BACKEND_TEST=true
+            SKIP_FRONTEND_TEST=true
+            CI=github
+            GITHUB_SHA=${{ github.event.workflow_run.head_sha }}
+            GIT_BRANCH=${{ github.event.workflow_run.head_branch }}
+            GITHUB_REF=refs/heads/${{ github.event.workflow_run.head_branch }}
+          outputs: type=image,name=ghcr.io/umputun/remark42,push-by-digest=true,name-canonical=true,push=true
+
+      - name: build and push to DockerHub by digest
+        id: build-dockerhub
+        uses: docker/build-push-action@v7
+        with:
+          context: .
+          platforms: ${{ matrix.platform }}
+          cache-from: type=gha,scope=${{ matrix.platform }}
+          build-args: |
+            SKIP_BACKEND_TEST=true
+            SKIP_FRONTEND_TEST=true
+            CI=github
+            GITHUB_SHA=${{ github.event.workflow_run.head_sha }}
+            GIT_BRANCH=${{ github.event.workflow_run.head_branch }}
+            GITHUB_REF=refs/heads/${{ github.event.workflow_run.head_branch }}
+          outputs: type=image,name=umputun/remark42,push-by-digest=true,name-canonical=true,push=true
+
+      - name: export digests
+        run: |
+          mkdir -p /tmp/digests/ghcr /tmp/digests/dockerhub
+          digest_ghcr="${{ steps.build-ghcr.outputs.digest }}"
+          digest_dockerhub="${{ steps.build-dockerhub.outputs.digest }}"
+          touch "/tmp/digests/ghcr/${digest_ghcr#sha256:}"
+          touch "/tmp/digests/dockerhub/${digest_dockerhub#sha256:}"
+
+      - name: upload ghcr digest
+        uses: actions/upload-artifact@v7
+        with:
+          name: digests-ghcr-${{ matrix.artifact }}
+          path: /tmp/digests/ghcr/*
+          retention-days: 1
+
+      - name: upload dockerhub digest
+        uses: actions/upload-artifact@v7
+        with:
+          name: digests-dockerhub-${{ matrix.artifact }}
+          path: /tmp/digests/dockerhub/*
+          retention-days: 1
+
+  merge:
+    name: Create multi-arch manifest
+    runs-on: ubuntu-latest
+    needs: build
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: download ghcr digests
+        uses: actions/download-artifact@v8
+        with:
+          path: /tmp/digests/ghcr
+          pattern: digests-ghcr-*
+          merge-multiple: true
+
+      - name: download dockerhub digests
+        uses: actions/download-artifact@v8
+        with:
+          path: /tmp/digests/dockerhub
+          pattern: digests-dockerhub-*
+          merge-multiple: true
+
+      - name: verify all digests present
+        run: |
+          expected=2
+          for registry in ghcr dockerhub; do
+            actual=$(find /tmp/digests/$registry -maxdepth 1 -type f | wc -l)
+            if [ "$actual" -ne "$expected" ]; then
+              echo "Expected $expected digests for $registry, found $actual"
+              ls -la /tmp/digests/$registry
+              exit 1
+            fi
+          done
+          echo "All digests present for both registries"
+
+      - name: set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
+      - name: login to ghcr.io
+        uses: docker/login-action@v4
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.PKG_TOKEN }}
+
+      - name: login to DockerHub
+        uses: docker/login-action@v4
+        with:
+          username: umputun
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+
+      - name: create ghcr.io manifest and push
+        working-directory: /tmp/digests/ghcr
+        env:
+          HEAD_BRANCH: ${{ github.event.workflow_run.head_branch }}
+        run: |
+          if [[ "$HEAD_BRANCH" == v* ]]; then
+            docker buildx imagetools create \
+              -t ghcr.io/umputun/remark42:${HEAD_BRANCH} \
+              -t ghcr.io/umputun/remark42:latest \
+              $(printf 'ghcr.io/umputun/remark42@sha256:%s ' *)
+          else
+            docker buildx imagetools create \
+              -t ghcr.io/umputun/remark42:${HEAD_BRANCH} \
+              $(printf 'ghcr.io/umputun/remark42@sha256:%s ' *)
+          fi
+
+      - name: create DockerHub manifest and push
+        working-directory: /tmp/digests/dockerhub
+        env:
+          HEAD_BRANCH: ${{ github.event.workflow_run.head_branch }}
+        run: |
+          if [[ "$HEAD_BRANCH" == v* ]]; then
+            docker buildx imagetools create \
+              -t umputun/remark42:${HEAD_BRANCH} \
+              -t umputun/remark42:latest \
+              $(printf 'umputun/remark42@sha256:%s ' *)
+          else
+            docker buildx imagetools create \
+              -t umputun/remark42:${HEAD_BRANCH} \
+              $(printf 'umputun/remark42@sha256:%s ' *)
+          fi
+
+  deploy:
+    name: Deploy to remark42.com
+    runs-on: ubuntu-latest
+    needs: merge
+    if: github.event.workflow_run.head_branch == 'master'
+    permissions: {} # only calls an external URL via curl, no GitHub API access needed
+
+    steps:
+      - name: trigger deployment
+        env:
+          UPDATER_KEY: ${{ secrets.UPDATER_KEY }}
+        run: curl -sf https://jess.umputun.com/update/remark42-core/${UPDATER_KEY}
@@ -4,29 +4,37 @@ on:
  push:
    branches: [master]
    paths:
+      - ".github/workflows/e2e-tests.yml"
      - "frontend/apps/remark42/**"
      - "frontend/e2e/**"
+      - "frontend/Dockerfile.e2e"

  pull_request:
    branches: [master]
    paths:
+      - ".github/workflows/e2e-tests.yml"
      - "frontend/apps/remark42/**"
      - "frontend/e2e/**"
+      - "frontend/Dockerfile.e2e"

 jobs:
  tests:
    name: Tests
    timeout-minutes: 60
    runs-on: ubuntu-latest
+    permissions:
+      contents: read
    steps:
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false

      - name: Build & run containers
        id: tests
        run: COMPOSE_DOCKER_CLI_BUILD=1 DOCKER_BUILDKIT=1 docker compose -f compose-e2e-test.yml up --build --quiet-pull --exit-code-from tests

-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v7
        if: always()
        with:
          name: playwright-report
@@ -0,0 +1,143 @@
+name: release
+
+on:
+  push:
+    tags:
+      - "v*"
+  pull_request:
+    paths:
+      - ".github/workflows/release.yml"
+      - ".goreleaser.yml"
+      - "Makefile"
+      - "scripts/**"
+      - "backend/**"
+      - "frontend/**"
+      - "README.md"
+      - "LICENSE"
+      - "CLAUDE.md"
+      - "site/src/docs/getting-started/installation/index.md"
+
+permissions:
+  contents: read
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: install go
+        uses: actions/setup-go@v6
+        with:
+          go-version: "1.25"
+          cache-dependency-path: backend/go.sum
+
+      - name: install pnpm
+        uses: pnpm/action-setup@v6.0.4
+        with:
+          version: 8
+          run_install: false
+
+      - name: install node
+        uses: actions/setup-node@v6
+        with:
+          node-version: 16
+          cache: "pnpm"
+          cache-dependency-path: frontend/pnpm-lock.yaml
+
+      - name: test and build backend
+        run: |
+          go test -race -timeout=120s ./...
+          go build -race ./...
+        working-directory: backend/app
+        env:
+          TZ: "America/Chicago"
+
+      - name: test examples
+        run: |
+          go test -race ./...
+          go build -race ./...
+        working-directory: backend/_example/memory_store
+        env:
+          TZ: "America/Chicago"
+
+      - name: install frontend dependencies
+        run: pnpm install --frozen-lockfile
+        working-directory: frontend
+        env:
+          CI: "true"
+
+      - name: check frontend
+        run: |
+          pnpm lint
+          pnpm type-check
+          pnpm test -- --runInBand
+        working-directory: frontend/apps/remark42
+        env:
+          CI: "true"
+
+      - name: check goreleaser snapshot
+        if: github.event_name == 'pull_request'
+        uses: goreleaser/goreleaser-action@v7
+        with:
+          version: latest
+          args: release --snapshot --clean --skip=publish
+        env:
+          SKIP_PNPM_INSTALL: "true"
+
+      - name: clean generated release assets
+        if: always()
+        run: ./scripts/cleanup-release-assets.sh
+
+  release:
+    if: github.event_name == 'push'
+    needs: validate
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: install go
+        uses: actions/setup-go@v6
+        with:
+          go-version: "1.25"
+          cache-dependency-path: backend/go.sum
+
+      - name: install pnpm
+        uses: pnpm/action-setup@v6.0.4
+        with:
+          version: 8
+          run_install: false
+
+      - name: install node
+        uses: actions/setup-node@v6
+        with:
+          node-version: 16
+          cache: "pnpm"
+          cache-dependency-path: frontend/pnpm-lock.yaml
+
+      - name: install frontend dependencies
+        run: pnpm install --frozen-lockfile
+        working-directory: frontend
+        env:
+          CI: "true"
+
+      - name: run goreleaser
+        uses: goreleaser/goreleaser-action@v7
+        with:
+          version: latest
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SKIP_PNPM_INSTALL: "true"
+
+      - name: clean generated release assets
+        if: always()
+        run: ./scripts/cleanup-release-assets.sh
@@ -15,6 +15,7 @@ debug.test
 .mongo
 remark42
 /bin/
+/dist/
 /backend/var/
 /backend/app/var/
 /backend/app/cmd/web/
@@ -26,3 +27,6 @@ compose-private.yml
 http-client.env.json
 /playwright-report/
 /backend/app/cmd/var
+
+# ralphex progress logs
+.ralphex/progress/
@@ -0,0 +1,69 @@
+version: 2
+
+project_name: remark42
+
+git:
+  ignore_tags:
+    - backend/*
+
+before:
+  hooks:
+    - ./scripts/prepare-release-assets.sh
+
+builds:
+  - id: remark42
+    dir: backend
+    main: ./app
+    binary: "remark42.{{ .Os }}-{{ .Arch }}"
+    env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - darwin
+      - freebsd
+      - windows
+    goarch:
+      - amd64
+      - arm64
+      - "386"
+      - arm
+    goarm:
+      - "7"
+    ignore:
+      - goos: darwin
+        goarch: "386"
+      - goos: darwin
+        goarch: arm
+      - goos: freebsd
+        goarch: arm64
+      - goos: freebsd
+        goarch: "386"
+      - goos: freebsd
+        goarch: arm
+      - goos: windows
+        goarch: arm64
+      - goos: windows
+        goarch: "386"
+      - goos: windows
+        goarch: arm
+    ldflags:
+      - -s -w -X main.revision={{ .Tag }}-{{ .ShortCommit }}-{{ trimsuffix (replace (replace .CommitDate "-" "") ":" "") "Z" }}
+
+archives:
+  - id: remark42
+    ids:
+      - remark42
+    name_template: "{{ .ProjectName }}.{{ .Os }}-{{ .Arch }}"
+    formats:
+      - tar.gz
+    format_overrides:
+      - goos: windows
+        formats:
+          - zip
+    files:
+      - LICENSE
+      - README.md
+
+release:
+  name_template: "Version {{ .Version }}"
+  mode: keep-existing
@@ -0,0 +1,59 @@
+# Remark42 Development Guidelines
+
+## Build/Test/Lint Commands
+- **Backend**:
+  - Run server: `make rundev`
+  - Build: `make backend`
+  - Race test: `make race_test`
+- **Backend Testing**:
+  - Run all tests: `cd backend/app && go test -timeout=60s -count 1 ./...`
+  - Run single test: `cd backend/app && go test -run TestName ./path/to/package`
+  - **IMPORTANT**: Run example tests: `cd backend/_example/memory_store && go test -race ./... && go build -race ./...`
+- **Frontend**:
+  - Development: `cd frontend && pnpm dev:app`
+  - Tests: `cd frontend && pnpm test`
+- **Lint**:
+  - Backend: `cd backend && golangci-lint run`
+  - **IMPORTANT**: Example lint: `cd backend/_example/memory_store && golangci-lint run --config ../../.golangci.yml`
+  - Frontend: `cd frontend && pnpm lint`
+  - **Before committing**: Always run tests and linter on both main backend AND examples
+- **Dependency Updates**:
+  - When updating Go modules in `backend/`, also run `go mod tidy` (and `go mod vendor`) in `backend/_example/memory_store` to keep indirect deps in sync. The example module replaces `github.com/umputun/remark42/backend` with `../../` so stale indirect deps there will break the example build.
+
+## Release Procedure
+
+Remark42 uses two tags for each release:
+- `vX.Y.Z` - product release tag used by GitHub releases, GoReleaser binary artifacts, and Docker image publishing.
+- `backend/vX.Y.Z` - nested Go module tag for `github.com/umputun/remark42/backend`.
+
+Release flow:
+1. Create the GitHub release for `vX.Y.Z` with title `Version X.Y.Z`. The GitHub release must exist before the `vX.Y.Z` tag reaches the remote; `gh release create vX.Y.Z` satisfies this because it creates and pushes the tag.
+2. The `vX.Y.Z` tag triggers GoReleaser, which builds and uploads binary artifacts to the existing release.
+3. Create and push the matching backend module tag pointing at the same commit:
+
+```bash
+git fetch origin --tags
+git tag backend/vX.Y.Z vX.Y.Z
+git push origin backend/vX.Y.Z
+```
+
+GoReleaser must ignore `backend/*` tags in `.goreleaser.yml` so release notes and current-tag detection use only product tags. Docker image publishing stays separate and is handled by the existing Docker workflow.
+
+For local artifact runs, install GoReleaser, Go 1.25, Node 16+, PNPM 8, and Perl, then use `make release`. The target runs a snapshot/no-publish GoReleaser build, leaves local artifacts and metadata in `dist/`, and cleans generated frontend embed files after GoReleaser exits. Do not run raw `goreleaser release` for local artifacts unless you also run `./scripts/cleanup-release-assets.sh` afterward.
+
+## Code Style
+- **Backend**: Formatting with golangci-lint, strict error handling
+- **Frontend**: TypeScript with ESLint, Stylelint and Prettier
+- **Imports**: Group stdlib, external packages, then internal packages
+- **CSS**: All components use CSS Modules (`component.module.css`). Class naming: BEM block = `.root`, elements = camelCase, modifiers = camelCase. Use `clsx` for conditional class composition. `raw-content.css` is the only global CSS file (syntax highlighting utility). Root wrapper keeps bare `.dark`/`.light` theme class — 8+ module CSS files depend on `:global(.dark)` ancestor. `comment_highlighting` uses `:global()` for imperative `classList` usage in root.tsx
+
+## Key Backend Packages
+- **Web/API**: `github.com/go-chi/chi/v5`, `github.com/go-pkgz/rest`
+- **Auth**: `github.com/go-pkgz/auth/v2`
+- **Logging**: `github.com/go-pkgz/lgr`
+- **Testing**: `github.com/stretchr/testify`
+- **Notifications**: `github.com/go-pkgz/notify`
+
+## Repository Structure
+- Backend: Go server using BoltDB for storage
+- Frontend: Preact/Redux-based UI with iframe embedding
@@ -1,4 +1,4 @@
-FROM --platform=$BUILDPLATFORM node:16.15.1-alpine AS frontend-deps
+FROM --platform=$BUILDPLATFORM node:16.20-alpine AS frontend-deps

 ARG SKIP_FRONTEND_TEST
 ARG SKIP_FRONTEND_BUILD
@@ -11,7 +11,7 @@ COPY ./frontend/apps/remark42/package.json /srv/frontend/apps/remark42/
 RUN \
  if [[ -z "$SKIP_FRONTEND_BUILD" || -z "$SKIP_FRONTEND_TEST" ]]; then \
    apk add --no-cache --update git && \
-    npm i -g pnpm@7; \
+    npm i -g pnpm@8; \
  fi

 RUN --mount=type=cache,id=pnpm,target=/root/.pnpm-store/v3 \
@@ -45,7 +45,7 @@ RUN \
    echo 'Skip frontend build'; \
  fi

-FROM umputun/baseimage:buildgo-v1.11.0 as build-backend
+FROM umputun/baseimage:buildgo-v1.17.0 AS build-backend

 ARG CI
 ARG GITHUB_REF
@@ -54,15 +54,15 @@ ARG GIT_BRANCH
 ARG SKIP_BACKEND_TEST
 ARG BACKEND_TEST_TIMEOUT

+# install gcc in order to be able to go test package with -race
+RUN apk --no-cache add gcc libc-dev
+
 ADD backend /build/backend
 # to embed the frontend files statically into Remark42 binary
 COPY --from=build-frontend /srv/frontend/apps/remark42/public/ /build/backend/app/cmd/web/
 RUN find /build/backend/app/cmd/web/ -regex '.*\.\(html\|js\|mjs\)$' -print -exec sed -i "s|{% REMARK_URL %}|http://127.0.0.1:8080|g" {} \;
 WORKDIR /build/backend

-# install gcc in order to be able to go test package with -race
-RUN apk --no-cache add gcc libc-dev
-
 RUN echo go version: `go version`

 # run tests
@@ -81,7 +81,7 @@ RUN \
    echo "version=$version" && \
    go build -o remark42 -ldflags "-X main.revision=${version} -s -w" ./app

-FROM umputun/baseimage:app-v1.11.0
+FROM umputun/baseimage:app-v1.17.0

 ARG GITHUB_SHA

@@ -89,7 +89,7 @@ LABEL org.opencontainers.image.authors="Umputun <umputun@gmail.com>" \
      org.opencontainers.image.description="Remark42 comment engine" \
      org.opencontainers.image.documentation="https://remark42.com/docs/getting-started/" \
      org.opencontainers.image.licenses="MIT" \
-      org.opencontainers.image.source="https://github.com/umputun/remark42.git" \
+      org.opencontainers.image.source="https://github.com/umputun/remark42" \
      org.opencontainers.image.title="Remark42" \
      org.opencontainers.image.url="https://remark42.com/" \
      org.opencontainers.image.revision="${GITHUB_SHA}"
@@ -1,64 +0,0 @@
-FROM node:16.15.1-alpine AS frontend-deps
-
-ENV CI=true
-
-WORKDIR /srv/frontend
-
-COPY ./frontend/package.json ./frontend/pnpm-lock.yaml ./frontend/pnpm-workspace.yaml /srv/frontend/
-COPY ./frontend/apps/remark42/package.json /srv/frontend/apps/remark42/package.json
-
-RUN apk add --no-cache --update git && npm i -g pnpm@7
-RUN --mount=type=cache,id=pnpm,target=/root/.pnpm-store/v3 pnpm i
-
-FROM frontend-deps AS build-frontend
-
-ENV NODE_ENV=production
-ENV CI=true
-
-WORKDIR /srv/frontend/apps/remark42/
-COPY ./frontend/apps/remark42/ /srv/frontend/apps/remark42/
-RUN pnpm build
-
-FROM umputun/baseimage:buildgo-v1.9.2 as build-backend
-
-ARG GITHUB_TOKEN
-ARG GITHUB_REF
-ARG GITHUB_SHA
-
-WORKDIR /build/backend
-ADD backend /build/backend
-ADD README.md /build/
-ADD LICENSE /build/
-
-COPY --from=build-frontend /srv/frontend/apps/remark42/public/ /build/backend/app/cmd/web/
-
-RUN find /build/backend/app/cmd/web/ -regex '.*\.\(html\|js\|mjs\)$' -print -exec sed -i "s|{% REMARK_URL %}|http://127.0.0.1:8080|g" {} \;
-
-RUN \
-  version=$("/script/version.sh") && echo "version=${version}" && \
-    GOOS=linux GOARCH=amd64 go build -o remark42.linux-amd64 -ldflags "-X main.revision=${version} -s -w" ./app && \
-    GOOS=linux GOARCH=386 go build -o remark42.linux-386 -ldflags "-X main.revision=${version} -s -w" ./app && \
-    GOOS=linux GOARCH=arm go build -o remark42.linux-arm -ldflags "-X main.revision=${version} -s -w" ./app && \
-    GOOS=linux GOARCH=arm64 go build -o remark42.linux-arm64 -ldflags "-X main.revision=${version} -s -w" ./app && \
-    GOOS=windows GOARCH=amd64 go build -o remark42.windows-amd64.exe -ldflags "-X main.revision=${version} -s -w" ./app && \
-    GOOS=darwin GOARCH=amd64 go build -o remark42.darwin-amd64 -ldflags "-X main.revision=${version} -s -w" ./app && \
-    GOOS=darwin GOARCH=arm64 go build -o remark42.darwin-arm64 -ldflags "-X main.revision=${version} -s -w" ./app && \
-    GOOS=freebsd GOARCH=amd64 go build -o remark42.freebsd-amd64 -ldflags "-X main.revision=${version} -s -w" ./app
-
-RUN \
-    apk add --no-cache --update zip && \
-    cp ../LICENSE ./LICENSE && cp ../README.md ./README.md && \
-    tar cvzf remark42.linux-amd64.tar.gz remark42.linux-amd64 LICENSE README.md && \
-    tar cvzf remark42.linux-386.tar.gz remark42.linux-386 LICENSE README.md && \
-    tar cvzf remark42.linux-arm.tar.gz remark42.linux-arm LICENSE README.md && \
-    tar cvzf remark42.linux-arm64.tar.gz remark42.linux-arm64 LICENSE README.md && \
-    tar cvzf remark42.darwin-amd64.tar.gz remark42.darwin-amd64 LICENSE README.md && \
-    tar cvzf remark42.darwin-arm64.tar.gz remark42.darwin-arm64 LICENSE README.md && \
-    tar cvzf remark42.freebsd-amd64.tar.gz remark42.freebsd-amd64 LICENSE README.md && \
-    zip remark42.windows-amd64.zip remark42.windows-amd64.exe LICENSE README.md
-
-
-FROM alpine
-COPY --from=build-backend /build/backend/remark42.* /artifacts/
-RUN ls -la /artifacts/*
-CMD ["sleep", "100"]
@@ -2,16 +2,16 @@ OS=linux
 ARCH=amd64
 GITHUB_REF=$(shell git rev-parse --symbolic-full-name HEAD)
 GITHUB_SHA=$(shell git rev-parse --short HEAD)
+CLEANUP_RELEASE_ASSETS=$(CURDIR)/scripts/cleanup-release-assets.sh

 bin:
-	docker build -f Dockerfile.artifacts -t remark42.bin .
-	- @docker rm -f remark42.bin 2>/dev/null || exit 0
-	docker run -d --name=remark42.bin remark42.bin
-	docker cp remark42.bin:/artifacts/remark42.$(OS)-$(ARCH) remark42
-	docker rm -f remark42.bin
+	@set -e; \
+		./scripts/prepare-release-assets.sh; \
+		trap '$(CLEANUP_RELEASE_ASSETS)' EXIT; \
+		cd backend && CGO_ENABLED=0 GOOS=$(OS) GOARCH=$(ARCH) go build -o ../remark42 -ldflags "-X main.revision=$(GITHUB_REF)-$(GITHUB_SHA) -s -w" ./app

 docker:
-	DOCKER_BUILDKIT=1 docker build -t umputun/remark42 --build-arg GITHUB_REF=$(GITHUB_REF) --build-arg GITHUB_SHA=$(GITHUB_SHA) \
+	DOCKER_BUILDKIT=1 docker build -t umputun/remark42 -t ghcr.io/umputun/remark42 --build-arg GITHUB_REF=$(GITHUB_REF) --build-arg GITHUB_SHA=$(GITHUB_SHA) \
 		--build-arg CI=true --build-arg SKIP_FRONTEND_TEST=true --build-arg SKIP_BACKEND_TEST=true .

 dockerx:
@@ -21,35 +21,25 @@ dockerx:
 		-t ghcr.io/umputun/remark42:master -t umputun/remark42:master .

 release:
-	docker build -f Dockerfile.artifacts --no-cache --pull --build-arg CI=true \
-		--build-arg GITHUB_REF=$(GITHUB_REF) --build-arg GITHUB_SHA=$(GITHUB_SHA) -t remark42.bin .
-	- @docker rm -f remark42.bin 2>/dev/null || exit 0
-	- @mkdir -p bin
-	docker run -d --name=remark42.bin remark42.bin
-	docker cp remark42.bin:/artifacts/remark42.linux-amd64.tar.gz bin/remark42.linux-amd64.tar.gz
-	docker cp remark42.bin:/artifacts/remark42.linux-386.tar.gz bin/remark42.linux-386.tar.gz
-	docker cp remark42.bin:/artifacts/remark42.linux-arm64.tar.gz bin/remark42.linux-arm64.tar.gz
-	docker cp remark42.bin:/artifacts/remark42.darwin-amd64.tar.gz bin/remark42.darwin-amd64.tar.gz
-	docker cp remark42.bin:/artifacts/remark42.darwin-arm64.tar.gz bin/remark42.darwin-arm64.tar.gz
-	docker cp remark42.bin:/artifacts/remark42.freebsd-amd64.tar.gz bin/remark42.freebsd-amd64.tar.gz
-	docker cp remark42.bin:/artifacts/remark42.windows-amd64.zip bin/remark42.windows-amd64.zip
-	docker rm -f remark42.bin
+	@set -e; \
+		trap '$(CLEANUP_RELEASE_ASSETS)' EXIT; \
+		goreleaser release --snapshot --clean --skip=publish

 race_test:
 	cd backend/app && go test -race -timeout=60s -count 1 ./...

 backend:
-	docker-compose -f compose-dev-backend.yml build
+	docker compose -f compose-dev-backend.yml build

 frontend:
-	docker-compose -f compose-dev-frontend.yml build
+	docker compose -f compose-dev-frontend.yml build

 rundev:
 	SKIP_BACKEND_TEST=true SKIP_FRONTEND_TEST=true GITHUB_REF=$(GITHUB_REF) GITHUB_SHA=$(GITHUB_SHA) CI=true \
-		docker-compose -f compose-private.yml build
-	docker-compose -f compose-private.yml up
+		docker compose -f compose-private.yml build
+	docker compose -f compose-private.yml up

 e2e:
 	docker compose -f compose-e2e-test.yml up --build --quiet-pull --exit-code-from tests

-.PHONY: bin backend
+.PHONY: bin docker dockerx release race_test backend frontend rundev e2e
@@ -2,7 +2,7 @@

 Remark42 is a self-hosted, lightweight and simple (yet functional) comment engine, which doesn't spy on users. It can be embedded into blogs, articles, or any other place where readers add comments.

-* Social login via Google, Twitter, Facebook, Microsoft, GitHub, Yandex, Patreon and Telegram
+* Social login via Google, Facebook, Microsoft, GitHub, Apple, Yandex, Patreon, Discord, Telegram and custom OAuth2 providers
 * Login via email
 * Optional anonymous access
 * Multi-level nested comments with both tree and plain presentations
@@ -12,4 +12,4 @@ We release patches for security vulnerabilities.

 ## Reporting a Vulnerability

-Please report (suspected) security vulnerabilities to umputun@gmail.com. You will receive a response from us within 48 hours. If the issue is confirmed, we will release a patch as soon as possible depending on complexity but historically within a few days.
+Please report (suspected) security vulnerabilities either by using GitHub's [private vulnerability reporting](https://github.com/umputun/remark42/security/advisories/new) (click the "Report a vulnerability" button on the [Security tab](https://github.com/umputun/remark42/security)) or by emailing umputun@gmail.com. You will receive a response within 48 hours. If the issue is confirmed, we will release a patch as soon as possible depending on complexity but historically within a few days.
@@ -1,68 +1,75 @@
-run:
-  timeout: 5m
-  output:
-    format: tab
-  skip-dirs:
-    - vendor
-
-linters-settings:
-  govet:
-    check-shadowing: true
-  maligned:
-    suggest-new: true
-  goconst:
-    min-len: 2
-    min-occurrences: 2
-  misspell:
-    locale: US
-  lll:
-    line-length: 140
-  gocritic:
-    enabled-tags:
-      - performance
-      - style
-      - experimental
-    disabled-checks:
-      - wrapperFunc
-# TODO: feel free to remove these excludes and fix the code
-      - hugeParam
-      - rangeValCopy
-
+version: "2"
 linters:
+  default: none
  enable:
    - bodyclose
-    - megacheck
-    - revive
-    - govet
-    - unconvert
-    - gas
-    - gocyclo
+    - copyloopvar
    - dupl
+    - gochecknoinits
+    - gocritic
+    - gocyclo
+    - gosec
+    - govet
+    - ineffassign
    - misspell
+    - nakedret
+    - prealloc
+    - revive
+    - staticcheck
+    - unconvert
    - unparam
    - unused
-    - typecheck
-    - ineffassign
-    - stylecheck
-    - gochecknoinits
-    - exportloopref
-    - gocritic
-    - nakedret
-    - gosimple
-    - prealloc
-  fast: false
-  disable-all: true
-
-issues:
-  exclude-rules:
-    - text: "at least one file in a package should have a package comment"
-      linters:
-        - stylecheck
-    - text: "package-comments: should have a package comment"
-      linters:
-        - revive
-    - path: _test\.go
-      linters:
-        - gosec
-        - dupl
-  exclude-use-default: false
+  settings:
+    goconst:
+      min-len: 2
+      min-occurrences: 2
+    gosec:
+      excludes:
+        - G117 # false positive: struct field name matches "secret" pattern
+    gocritic:
+      disabled-checks:
+        - wrapperFunc
+        - hugeParam
+        - rangeValCopy
+      enabled-tags:
+        - performance
+        - style
+        - experimental
+    govet:
+      enable:
+        - shadow
+    lll:
+      line-length: 140
+    misspell:
+      locale: US
+  exclusions:
+    generated: lax
+    rules:
+      - linters:
+          - staticcheck
+        text: at least one file in a package should have a package comment
+      - linters:
+          - revive
+        text: 'package-comments: should have a package comment'
+      - linters:
+          - revive
+        text: 'var-naming: avoid meaningless package names'
+      - linters:
+          - revive
+        text: 'var-naming: avoid package names that conflict with Go standard library package names'
+      - linters:
+          - dupl
+          - gosec
+        path: _test\.go
+    paths:
+      - vendor
+      - third_party$
+      - builtin$
+      - examples$
+formatters:
+  exclusions:
+    generated: lax
+    paths:
+      - third_party$
+      - builtin$
+      - examples$
@@ -1,11 +1,11 @@
-FROM umputun/baseimage:buildgo-v1.9.2 as build-backend
+FROM umputun/baseimage:buildgo-v1.17.0 AS build-backend

 ADD backend /build/backend
 WORKDIR /build/backend/_example/memory_store

 RUN go build -o /build/bin/memory_store -ldflags "-X main.revision=0.0.0 -s -w"

-FROM umputun/baseimage:app-v1.9.2
+FROM umputun/baseimage:app-v1.17.0

 ARG GITHUB_SHA

@@ -13,7 +13,7 @@ LABEL org.opencontainers.image.authors="Umputun <umputun@gmail.com>" \
      org.opencontainers.image.description="Remark42 comment engine example JRPC memory store" \
      org.opencontainers.image.documentation="https://github.com/umputun/remark42/tree/master/backend/_example/memory_store" \
      org.opencontainers.image.licenses="MIT" \
-      org.opencontainers.image.source="https://github.com/umputun/remark42.git" \
+      org.opencontainers.image.source="https://github.com/umputun/remark42" \
      org.opencontainers.image.title="Remark42 JRPC example memory store" \
      org.opencontainers.image.url="https://remark42.com/" \
      org.opencontainers.image.revision="${GITHUB_SHA}"
@@ -4,9 +4,9 @@

 In order to run remark42 with memory_store copy provided `compose-dev-memstore.yml` to the root directory and run:

-1. `docker-compose -f compose-dev-memstore.yml build`
-1. `docker-compose -f compose-dev-memstore.yml up`
+1. `docker compose -f compose-dev-memstore.yml build`
+1. `docker compose -f compose-dev-memstore.yml up`

 As usual, demo site will run on http://127.0.0.1:8080/web/

-note: in order to work with the latest (current) version of master `go.mod` uses replacement directive for the backend package. In real-life usage `replace github.com/umputun/remark42/backend => ../../`  should not be used. 
+note: in order to work with the latest (current) version of master `go.mod` uses replacement directive for the backend package. In real-life usage `replace github.com/umputun/remark42/backend => ../../`  should not be used. 
@@ -251,11 +251,11 @@ func (m *MemData) Flag(req engine.FlagRequest) (val bool, err error) {

 // ListFlags get list of flagged keys, like blocked & verified user
 // works for full locator (post flags) or with userID
-func (m *MemData) ListFlags(req engine.FlagRequest) (res []interface{}, err error) {
+func (m *MemData) ListFlags(req engine.FlagRequest) (res []any, err error) {
 	m.mu.RLock()
 	defer m.mu.RUnlock()

-	res = []interface{}{}
+	res = []any{}

 	switch req.Flag {
 	case engine.Verified:
@@ -293,17 +293,17 @@ func (m *MemData) UserDetail(req engine.UserDetailRequest) ([]engine.UserDetailE
 		defer m.mu.Unlock()

 		if req.Update == "" { // read detail value, no update requested
-			return m.getUserDetail(req)
+			return m.getUserDetail(req), nil
 		}

-		return m.setUserDetail(req)
+		return m.setUserDetail(req), nil
 	case engine.AllUserDetails:
 		// list of all details returned in case request is a read request
 		// (Update is not set) and does not have UserID or Detail set
 		if req.Update == "" && req.UserID == "" { // read list of all details
 			m.mu.Lock()
 			defer m.mu.Unlock()
-			return m.listDetails(req.Locator)
+			return m.listDetails(req.Locator), nil
 		}
 		return nil, fmt.Errorf("unsupported request with userdetail all")
 	default:
@@ -319,7 +319,8 @@ func (m *MemData) Delete(req engine.DeleteRequest) error {

 	switch {
 	case req.UserDetail != "": // delete user detail
-		return m.deleteUserDetail(req.Locator, req.UserID, req.UserDetail)
+		m.deleteUserDetail(req.Locator, req.UserID, req.UserDetail)
+		return nil
 	case req.Locator.URL != "" && req.CommentID != "" && req.UserDetail == "": // delete comment
 		return m.deleteComment(req.Locator, req.CommentID, req.DeleteMode)

@@ -332,7 +333,8 @@ func (m *MemData) Delete(req engine.DeleteRequest) error {
 				return e
 			}
 		}
-		return m.deleteUserDetail(req.Locator, req.UserID, engine.AllUserDetails)
+		m.deleteUserDetail(req.Locator, req.UserID, engine.AllUserDetails)
+		return nil

 	case req.Locator.SiteID != "" && req.Locator.URL == "" && req.CommentID == "" && req.UserID == "" && req.UserDetail == "": // delete site
 		if _, ok := m.posts[req.Locator.SiteID]; !ok {
@@ -389,10 +391,7 @@ func (m *MemData) checkFlag(req engine.FlagRequest) (val bool) {

 func (m *MemData) setFlag(req engine.FlagRequest) (res bool, err error) {

-	status := false
-	if req.Update == engine.FlagTrue {
-		status = true
-	}
+	status := req.Update == engine.FlagTrue

 	switch req.Flag {

@@ -437,29 +436,29 @@ func (m *MemData) setFlag(req engine.FlagRequest) (res bool, err error) {

 // getUserDetail returns UserDetailEntry with requested userDetail (omitting other details)
 // as an only element of the slice.
-func (m *MemData) getUserDetail(req engine.UserDetailRequest) ([]engine.UserDetailEntry, error) {
+func (m *MemData) getUserDetail(req engine.UserDetailRequest) []engine.UserDetailEntry {
 	if meta, ok := m.metaUsers[req.UserID]; ok {
 		if meta.SiteID != req.Locator.SiteID {
-			return []engine.UserDetailEntry{}, nil
+			return []engine.UserDetailEntry{}
 		}
 		switch req.Detail {
 		case engine.UserEmail:
-			return []engine.UserDetailEntry{{UserID: req.UserID, Email: meta.Details.Email}}, nil
+			return []engine.UserDetailEntry{{UserID: req.UserID, Email: meta.Details.Email}}
 		case engine.UserTelegram:
-			return []engine.UserDetailEntry{{UserID: req.UserID, Telegram: meta.Details.Telegram}}, nil
+			return []engine.UserDetailEntry{{UserID: req.UserID, Telegram: meta.Details.Telegram}}
 		}
 	}

-	return []engine.UserDetailEntry{}, nil
+	return []engine.UserDetailEntry{}
 }

 // setUserDetail sets requested userDetail, returning complete updated UserDetailEntry as an onlyIps
 // element of the slice in case of success
-func (m *MemData) setUserDetail(req engine.UserDetailRequest) ([]engine.UserDetailEntry, error) {
+func (m *MemData) setUserDetail(req engine.UserDetailRequest) []engine.UserDetailEntry {
 	var entry metaUser
 	if meta, ok := m.metaUsers[req.UserID]; ok {
 		if meta.SiteID != req.Locator.SiteID {
-			return []engine.UserDetailEntry{}, nil
+			return []engine.UserDetailEntry{}
 		}
 		entry = meta
 	}
@@ -476,42 +475,42 @@ func (m *MemData) setUserDetail(req engine.UserDetailRequest) ([]engine.UserDeta
 	case engine.UserEmail:
 		entry.Details.Email = req.Update
 		m.metaUsers[req.UserID] = entry
-		return []engine.UserDetailEntry{{UserID: req.UserID, Email: req.Update}}, nil
+		return []engine.UserDetailEntry{{UserID: req.UserID, Email: req.Update}}
 	case engine.UserTelegram:
 		entry.Details.Telegram = req.Update
 		m.metaUsers[req.UserID] = entry
-		return []engine.UserDetailEntry{{UserID: req.UserID, Telegram: req.Update}}, nil
+		return []engine.UserDetailEntry{{UserID: req.UserID, Telegram: req.Update}}
 	}

-	return []engine.UserDetailEntry{}, nil
+	return []engine.UserDetailEntry{}
 }

 // listDetails lists all available users details for given siteID
-func (m *MemData) listDetails(loc store.Locator) ([]engine.UserDetailEntry, error) {
+func (m *MemData) listDetails(loc store.Locator) []engine.UserDetailEntry {
 	var res []engine.UserDetailEntry
 	for _, u := range m.metaUsers {
 		if u.SiteID == loc.SiteID {
 			res = append(res, u.Details)
 		}
 	}
-	return res, nil
+	return res
 }

 // deleteUserDetail deletes requested UserDetail or whole UserDetailEntry,
 // deletion of the absent entry doesn't produce error.
 // Trying to delete user with wrong siteID doesn't to anything and doesn't produce error.
-func (m *MemData) deleteUserDetail(locator store.Locator, userID string, userDetail engine.UserDetail) error {
+func (m *MemData) deleteUserDetail(locator store.Locator, userID string, userDetail engine.UserDetail) {
 	var entry metaUser
 	if meta, ok := m.metaUsers[userID]; ok {
 		if meta.SiteID != locator.SiteID {
-			return nil
+			return
 		}
 		entry = meta
 	}

 	if entry == (metaUser{}) || entry.Details == (engine.UserDetailEntry{}) {
 		// absent entry means that we should not do anything
-		return nil
+		return
 	}

 	switch userDetail {
@@ -529,7 +528,6 @@ func (m *MemData) deleteUserDetail(locator store.Locator, userID string, userDet
 	}

 	m.metaUsers[userID] = entry
-	return nil
 }

 func (m *MemData) get(loc store.Locator, commentID string) (store.Comment, error) {
@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"sort"
 	"testing"
+	"testing/synctest"
 	"time"

 	"github.com/stretchr/testify/assert"
@@ -198,7 +199,7 @@ func TestMemData_FindForUserPagination(t *testing.T) {
 	}

 	// write 200 comments
-	for i := 0; i < 200; i++ {
+	for i := range 200 {
 		c.ID = fmt.Sprintf("idd-%d", i)
 		c.Text = fmt.Sprintf("text #%d", i)
 		c.Timestamp = time.Date(2017, 12, 20, 15, 18, i, 0, time.Local)
@@ -286,7 +287,7 @@ func TestMemData_CountUser(t *testing.T) {

 func TestMemData_InfoPost(t *testing.T) {
 	b := prepMem(t)
-	ts := func(min int) time.Time { return time.Date(2017, 12, 20, 15, 18, min, 0, time.Local).In(time.UTC) }
+	ts := func(minute int) time.Time { return time.Date(2017, 12, 20, 15, 18, minute, 0, time.Local).In(time.UTC) }

 	// add one more for https://radio-t.com/2
 	comment := store.Comment{
@@ -484,7 +485,7 @@ func TestMemData_FlagVerified(t *testing.T) {
 func TestMemData_FlagListVerified(t *testing.T) {

 	b := prepMem(t)
-	toIDs := func(inp []interface{}) (res []string) {
+	toIDs := func(inp []any) (res []string) {
 		res = make([]string, len(inp))
 		for i, v := range inp {
 			vv, ok := v.(string)
@@ -521,51 +522,52 @@ func TestMemData_FlagListVerified(t *testing.T) {
 }

 func TestMemData_FlagListBlocked(t *testing.T) {
-
-	b := prepMem(t)
-	setBlocked := func(site, user string, status engine.FlagStatus, ttl time.Duration) error {
-		req := engine.FlagRequest{Flag: engine.Blocked, Locator: store.Locator{SiteID: site}, UserID: user, Update: status,
-			TTL: ttl}
-		_, err := b.Flag(req)
-		return err
-	}
-
-	toBlocked := func(inp []interface{}) (res []store.BlockedUser) {
-		res = make([]store.BlockedUser, len(inp))
-		for i, v := range inp {
-			vv, ok := v.(store.BlockedUser)
-			require.True(t, ok)
-			res[i] = vv
+	synctest.Test(t, func(t *testing.T) {
+		b := prepMem(t)
+		setBlocked := func(site, user string, status engine.FlagStatus, ttl time.Duration) error {
+			req := engine.FlagRequest{Flag: engine.Blocked, Locator: store.Locator{SiteID: site}, UserID: user, Update: status,
+				TTL: ttl}
+			_, err := b.Flag(req)
+			return err
 		}
-		return res
-	}
-	assert.NoError(t, setBlocked("radio-t", "user1", engine.FlagTrue, 0))
-	assert.NoError(t, setBlocked("radio-t", "user2", engine.FlagTrue, 50*time.Millisecond))
-	assert.NoError(t, setBlocked("radio-t", "user3", engine.FlagFalse, 0))

-	vv, err := b.ListFlags(engine.FlagRequest{Flag: engine.Blocked, Locator: store.Locator{SiteID: "radio-t"}})
-	assert.NoError(t, err)
+		toBlocked := func(inp []any) (res []store.BlockedUser) {
+			res = make([]store.BlockedUser, len(inp))
+			for i, v := range inp {
+				vv, ok := v.(store.BlockedUser)
+				require.True(t, ok)
+				res[i] = vv
+			}
+			return res
+		}
+		assert.NoError(t, setBlocked("radio-t", "user1", engine.FlagTrue, 0))
+		assert.NoError(t, setBlocked("radio-t", "user2", engine.FlagTrue, 50*time.Millisecond))
+		assert.NoError(t, setBlocked("radio-t", "user3", engine.FlagFalse, 0))

-	blockedList := toBlocked(vv)
-	var blockedIds = make([]string, len(blockedList))
-	for i, x := range blockedList {
-		blockedIds[i] = x.ID
-	}
-	require.Equal(t, 2, len(blockedList), b.metaUsers)
-	assert.ElementsMatch(t, []string{"user1", "user2"}, blockedIds)
-	t.Logf("%+v", blockedList)
+		vv, err := b.ListFlags(engine.FlagRequest{Flag: engine.Blocked, Locator: store.Locator{SiteID: "radio-t"}})
+		assert.NoError(t, err)

-	// check block expiration
-	time.Sleep(50 * time.Millisecond)
-	vv, err = b.ListFlags(engine.FlagRequest{Flag: engine.Blocked, Locator: store.Locator{SiteID: "radio-t"}})
-	assert.NoError(t, err)
-	blockedList = toBlocked(vv)
-	require.Equal(t, 1, len(blockedList))
-	assert.Equal(t, "user1", blockedList[0].ID)
+		blockedList := toBlocked(vv)
+		var blockedIDs = make([]string, len(blockedList))
+		for i, x := range blockedList {
+			blockedIDs[i] = x.ID
+		}
+		require.Equal(t, 2, len(blockedList), b.metaUsers)
+		assert.ElementsMatch(t, []string{"user1", "user2"}, blockedIDs)
+		t.Logf("%+v", blockedList)

-	vv, err = b.ListFlags(engine.FlagRequest{Flag: engine.Blocked, Locator: store.Locator{SiteID: "bad"}})
-	assert.NoError(t, err)
-	assert.Equal(t, 0, len(vv))
+		// check block expiration
+		time.Sleep(50 * time.Millisecond)
+		vv, err = b.ListFlags(engine.FlagRequest{Flag: engine.Blocked, Locator: store.Locator{SiteID: "radio-t"}})
+		assert.NoError(t, err)
+		blockedList = toBlocked(vv)
+		require.Equal(t, 1, len(blockedList))
+		assert.Equal(t, "user1", blockedList[0].ID)
+
+		vv, err = b.ListFlags(engine.FlagRequest{Flag: engine.Blocked, Locator: store.Locator{SiteID: "bad"}})
+		assert.NoError(t, err)
+		assert.Equal(t, 0, len(vv))
+	})
 }

 func TestMemData_DeleteComment(t *testing.T) {
@@ -70,6 +70,17 @@ func (m *MemImage) Load(id string) ([]byte, error) {
 	return img, nil
 }

+// Delete image by ID
+func (m *MemImage) Delete(id string) error {
+	m.mu.Lock()
+	// delete key from permanent and staging storage
+	delete(m.images, id)
+	delete(m.insertTime, id)
+	delete(m.imagesStaging, id)
+	m.mu.Unlock()
+	return nil
+}
+
 // Commit moves image from staging to permanent
 func (m *MemImage) Commit(id string) error {
 	m.mu.RLock()
@@ -18,7 +18,7 @@ import (
 )

 // gopher png for test, from https://golang.org/src/image/png/example_test.go
-const gopher = "iVBORw0KGgoAAAANSUhEUgAAAEsAAAA8CAAAAAALAhhPAAAFfUlEQVRYw62XeWwUVRzHf2" +
+const rawGopher = "iVBORw0KGgoAAAANSUhEUgAAAEsAAAA8CAAAAAALAhhPAAAFfUlEQVRYw62XeWwUVRzHf2" +
 	"+OPbo9d7tsWyiyaZti6eWGAhISoIGKECEKCAiJJkYTiUgTMYSIosYYBBIUIxoSPIINEBDi2VhwkQrVsj1ESgu9doHWdrul7ba" +
 	"73WNm3vOPtsseM9MdwvvrzTs+8/t95ze/33sI5BqiabU6m9En8oNjduLnAEDLUsQXFF8tQ5oxK3vmnNmDSMtrncks9Hhtt" +
 	"/qeWZapHb1ha3UqYSWVl2ZmpWgaXMXGohQAvmeop3bjTRtv6SgaK/Pb9/bFzUrYslbFAmHPp+3WhAYdr+7GN/YnpN46Opv55VDs" +
@@ -38,7 +38,9 @@ const gopher = "iVBORw0KGgoAAAANSUhEUgAAAEsAAAA8CAAAAAALAhhPAAAFfUlEQVRYw62XeWwU
 	"1y98c3D27eppUjsZ6fql3jcd5rUe7+ZIlLNQny3Rd+E5Tct3WVhTM5RBCEdiEK0b6B+/ca2gYU393nFj/n1AygRQxPIUA043M42u85+z2S" +
 	"nssKrPl8Mx76NL3E6eXc3be7OD+H4WHbJkKI8AU8irbITQjZ+0hQcPEgId/Fn/pl9crKH02+5o2b9T/eMx7pKoskYgAAAABJRU5ErkJggg=="

-func gopherPNG() io.Reader { return base64.NewDecoder(base64.StdEncoding, strings.NewReader(gopher)) }
+func gopherPNG() io.Reader {
+	return base64.NewDecoder(base64.StdEncoding, strings.NewReader(rawGopher))
+}

 func TestMemImage_LoadAfterSave(t *testing.T) {
 	svc := NewMemImageStore()
@@ -57,7 +59,8 @@ func TestMemImage_LoadAfterSave(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, gopher, img)

-	svc.ResetCleanupTimer(id)
+	err = svc.ResetCleanupTimer(id)
+	assert.NoError(t, err)

 	err = svc.Commit(id)
 	assert.NoError(t, err)
@@ -70,6 +73,26 @@ func TestMemImage_LoadAfterSave(t *testing.T) {
 	assert.Equal(t, gopher, img)
 }

+func TestMemImage_LoadAfterDelete(t *testing.T) {
+	svc := NewMemImageStore()
+	gopher, err := io.ReadAll(gopherPNG())
+	assert.NoError(t, err)
+
+	id := "test_img"
+	err = svc.Save(id, gopher)
+	assert.NoError(t, err)
+
+	err = svc.Delete(id)
+	assert.NoError(t, err)
+
+	img, err := svc.Load(id)
+	assert.EqualError(t, err, "image test_img not found")
+	assert.Empty(t, img)
+
+	err = svc.ResetCleanupTimer(id)
+	assert.EqualError(t, err, "image test_img not found")
+}
+
 func TestMemImage_CommitFail(t *testing.T) {
 	svc := NewMemImageStore()
 	err := svc.Commit("test_id")
@@ -11,7 +11,7 @@ services:
      args:
        - SKIP_BACKEND_TEST=true
        - SKIP_FRONTEND_TEST=true
-    image: umputun/remark42:dev
+    image: ghcr.io/umputun/remark42:dev
    container_name: "remark42-dev"
    hostname: "remark42-dev"
    restart: always
@@ -1,41 +1,39 @@
 module github.com/umputun/remark42/memory_store

-go 1.20
+go 1.25.0

 require (
-	github.com/go-pkgz/jrpc v0.3.0
-	github.com/go-pkgz/lgr v0.11.0
-	github.com/jessevdk/go-flags v1.5.0
-	github.com/stretchr/testify v1.8.4
+	github.com/go-pkgz/jrpc v0.4.0
+	github.com/go-pkgz/lgr v0.12.3
+	github.com/jessevdk/go-flags v1.6.1
+	github.com/stretchr/testify v1.11.1
 	github.com/umputun/remark42/backend v1.1000.0
 )

 require (
 	github.com/Depado/bfchroma/v2 v2.0.0 // indirect
-	github.com/PuerkitoBio/goquery v1.8.1 // indirect
-	github.com/ajg/form v1.5.1 // indirect
-	github.com/alecthomas/chroma/v2 v2.8.0 // indirect
-	github.com/andybalholm/cascadia v1.3.2 // indirect
+	github.com/PuerkitoBio/goquery v1.12.0 // indirect
+	github.com/alecthomas/chroma/v2 v2.24.1 // indirect
+	github.com/andybalholm/cascadia v1.3.3 // indirect
 	github.com/aymerick/douceur v0.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/didip/tollbooth/v7 v7.0.1 // indirect
-	github.com/didip/tollbooth_chi v0.0.0-20220719025231-d662a7f6928f // indirect
-	github.com/dlclark/regexp2 v1.10.0 // indirect
-	github.com/go-chi/chi/v5 v5.0.10 // indirect
-	github.com/go-chi/render v1.0.3 // indirect
-	github.com/go-pkgz/expirable-cache v1.0.0 // indirect
-	github.com/go-pkgz/rest v1.17.0 // indirect
-	github.com/gorilla/css v1.0.0 // indirect
+	github.com/dlclark/regexp2 v1.12.0 // indirect
+	github.com/go-pkgz/rest v1.21.0 // indirect
+	github.com/go-pkgz/routegroup v1.6.0 // indirect
+	github.com/gorilla/css v1.0.1 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
-	github.com/microcosm-cc/bluemonday v1.0.25 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/microcosm-cc/bluemonday v1.0.27 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/rs/xid v1.5.0 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
+	github.com/rs/xid v1.6.0 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	go.etcd.io/bbolt v1.3.7 // indirect
-	golang.org/x/image v0.11.0 // indirect
-	golang.org/x/net v0.14.0 // indirect
-	golang.org/x/sys v0.11.0 // indirect
+	go.etcd.io/bbolt v1.4.3 // indirect
+	golang.org/x/crypto v0.51.0 // indirect
+	golang.org/x/image v0.40.0 // indirect
+	golang.org/x/net v0.54.0 // indirect
+	golang.org/x/sys v0.44.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

@@ -1,126 +1,136 @@
 github.com/Depado/bfchroma/v2 v2.0.0 h1:IRpN9BPkNwEpR6w1ectIcNWOuhDSLx+8f1pn83fzxx8=
 github.com/Depado/bfchroma/v2 v2.0.0/go.mod h1:wFwW/Pw8Tnd0irzgO9Zxtxgzp3aPS8qBWlyadxujxmw=
-github.com/PuerkitoBio/goquery v1.8.1 h1:uQxhNlArOIdbrH1tr0UXwdVFgDcZDrZVdcpygAcwmWM=
-github.com/PuerkitoBio/goquery v1.8.1/go.mod h1:Q8ICL1kNUJ2sXGoAhPGUdYDJvgQgHzJsnnd3H7Ho5jQ=
-github.com/ajg/form v1.5.1 h1:t9c7v8JUKu/XxOGBU0yjNpaMloxGEJhUkqFRq0ibGeU=
-github.com/ajg/form v1.5.1/go.mod h1:uL1WgH+h2mgNtvBq0339dVnzXdBETtL2LeUXaIv25UY=
-github.com/alecthomas/assert/v2 v2.2.1 h1:XivOgYcduV98QCahG8T5XTezV5bylXe+lBxLG2K2ink=
-github.com/alecthomas/chroma/v2 v2.8.0 h1:w9WJUjFFmHHB2e8mRpL9jjy3alYDlU0QLDezj1xE264=
-github.com/alecthomas/chroma/v2 v2.8.0/go.mod h1:yrkMI9807G1ROx13fhe1v6PN2DDeaR73L3d+1nmYQtw=
-github.com/alecthomas/repr v0.2.0 h1:HAzS41CIzNW5syS8Mf9UwXhNH1J9aix/BvDRf1Ml2Yk=
-github.com/andybalholm/cascadia v1.3.1/go.mod h1:R4bJ1UQfqADjvDa4P6HZHLh/3OxWWEqc0Sk8XGwHqvA=
-github.com/andybalholm/cascadia v1.3.2 h1:3Xi6Dw5lHF15JtdcmAHD3i1+T8plmv7BQ/nsViSLyss=
-github.com/andybalholm/cascadia v1.3.2/go.mod h1:7gtRlve5FxPPgIgX36uWBX58OdBsSS6lUvCFb+h7KvU=
+github.com/PuerkitoBio/goquery v1.12.0 h1:pAcL4g3WRXekcB9AU/y1mbKez2dbY2AajVhtkO8RIBo=
+github.com/PuerkitoBio/goquery v1.12.0/go.mod h1:802ej+gV2y7bbIhOIoPY5sT183ZW0YFofScC4q/hIpQ=
+github.com/alecthomas/assert/v2 v2.11.0 h1:2Q9r3ki8+JYXvGsDyBXwH3LcJ+WK5D0gc5E8vS6K3D0=
+github.com/alecthomas/assert/v2 v2.11.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
+github.com/alecthomas/chroma/v2 v2.24.1 h1:m5ffpfZbIb++k8AqFEKy9uVgY12xIQtBsQlc6DfZJQM=
+github.com/alecthomas/chroma/v2 v2.24.1/go.mod h1:l+ohZ9xRXIbGe7cIW+YZgOGbvuVLjMps/FYN/CwuabI=
+github.com/alecthomas/repr v0.5.2 h1:SU73FTI9D1P5UNtvseffFSGmdNci/O6RsqzeXJtP0Qs=
+github.com/alecthomas/repr v0.5.2/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
+github.com/andybalholm/cascadia v1.3.3 h1:AG2YHrzJIm4BZ19iwJ/DAua6Btl3IwJX+VI4kktS1LM=
+github.com/andybalholm/cascadia v1.3.3/go.mod h1:xNd9bqTn98Ln4DwST8/nG+H0yuB8Hmgu1YHNnWw0GeA=
 github.com/aymerick/douceur v0.2.0 h1:Mv+mAeH1Q+n9Fr+oyamOlAkUNPWPlA8PPGR0QAaYuPk=
 github.com/aymerick/douceur v0.2.0/go.mod h1:wlT5vV2O3h55X9m7iVYN0TBM0NH/MmbLnd30/FjWUq4=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/didip/tollbooth/v7 v7.0.0/go.mod h1:VZhDSGl5bDSPj4wPsih3PFa4Uh9Ghv8hgacaTm5PRT4=
-github.com/didip/tollbooth/v7 v7.0.1 h1:TkT4sBKoQoHQFPf7blQ54iHrZiTDnr8TceU+MulVAog=
-github.com/didip/tollbooth/v7 v7.0.1/go.mod h1:VZhDSGl5bDSPj4wPsih3PFa4Uh9Ghv8hgacaTm5PRT4=
-github.com/didip/tollbooth_chi v0.0.0-20220719025231-d662a7f6928f h1:jtKwihcLmUC9BAhoJ9adCUqdSSZcOdH2KL7mPTUm2aw=
-github.com/didip/tollbooth_chi v0.0.0-20220719025231-d662a7f6928f/go.mod h1:q9C80dnsuVRP2dAskjnXRNWdUJqtGgwG9wNrzt0019s=
-github.com/dlclark/regexp2 v1.10.0 h1:+/GIL799phkJqYW+3YbOd8LCcbHzT0Pbo8zl70MHsq0=
-github.com/dlclark/regexp2 v1.10.0/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
-github.com/go-chi/chi/v5 v5.0.7/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
-github.com/go-chi/chi/v5 v5.0.10 h1:rLz5avzKpjqxrYwXNfmjkrYYXOyLJd37pz53UFHC6vk=
-github.com/go-chi/chi/v5 v5.0.10/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
-github.com/go-chi/render v1.0.1/go.mod h1:pq4Rr7HbnsdaeHagklXub+p6Wd16Af5l9koip1OvJns=
-github.com/go-chi/render v1.0.3 h1:AsXqd2a1/INaIfUSKq3G5uA8weYx20FOsM7uSoCyyt4=
-github.com/go-chi/render v1.0.3/go.mod h1:/gr3hVkmYR0YlEy3LxCuVRFzEu9Ruok+gFqbIofjao0=
-github.com/go-pkgz/expirable-cache v0.1.0/go.mod h1:GTrEl0X+q0mPNqN6dtcQXksACnzCBQ5k/k1SwXJsZKs=
-github.com/go-pkgz/expirable-cache v1.0.0 h1:ns5+1hjY8hntGv8bPaQd9Gr7Jyo+Uw5SLyII40aQdtA=
-github.com/go-pkgz/expirable-cache v1.0.0/go.mod h1:GTrEl0X+q0mPNqN6dtcQXksACnzCBQ5k/k1SwXJsZKs=
-github.com/go-pkgz/jrpc v0.3.0 h1:Fls38KqPsHzvp0FWfivr6cGnncC+iFBodHBqvUPY+0U=
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+golang.org/x/term v0.20.0/go.mod h1:8UkIAJTvZgivsXaD6/pH6U9ecQzZ45awqEOzuCvwpFY=
+golang.org/x/term v0.27.0/go.mod h1:iMsnZpn0cago0GOrHO2+Y7u7JPn5AylBrcoWkElMTSM=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
-golang.org/x/text v0.12.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
+golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
@@ -73,7 +73,7 @@ func (s *RPC) admEnabledHndl(id uint64, params json.RawMessage) (rr jrpc.Respons
 // onEvent returns nothing, callback to OnEvent
 func (s *RPC) admEventHndl(id uint64, params json.RawMessage) (rr jrpc.Response) {
 	var siteID string
-	var ps []interface{}
+	var ps []any
 	if err := json.Unmarshal(params, &ps); err != nil {
 		return jrpc.Response{Error: err.Error()}
 	}
@@ -217,7 +217,7 @@ func TestRPC_listFlagsHndl(t *testing.T) {

 	flags, err = re.ListFlags(verifyFlagReq)
 	require.NoError(t, err)
-	assert.Equal(t, []interface{}{"u1"}, flags)
+	assert.Equal(t, []any{"u1"}, flags)
 	verifiedUsers := make([]string, 0, len(flags))
 	for _, v := range flags {
 		verifiedUsers = append(verifiedUsers, v.(string))
@@ -35,7 +35,6 @@ func (s *RPC) imgResetClnTimerHndl(id uint64, params json.RawMessage) (rr jrpc.R
 	}
 	err := s.img.ResetCleanupTimer(fileID)
 	return jrpc.EncodeResponse(id, nil, err)
-
 }

 func (s *RPC) imgLoadHndl(id uint64, params json.RawMessage) (rr jrpc.Response) {
@@ -47,6 +46,16 @@ func (s *RPC) imgLoadHndl(id uint64, params json.RawMessage) (rr jrpc.Response)
 	return jrpc.EncodeResponse(id, value, err)
 }

+func (s *RPC) imgDeleteHndl(id uint64, params json.RawMessage) (rr jrpc.Response) {
+	var fileID string
+	if err := json.Unmarshal(params, &fileID); err != nil {
+		return jrpc.Response{Error: err.Error()}
+	}
+	err := s.img.Delete(fileID)
+	return jrpc.EncodeResponse(id, nil, err)
+
+}
+
 func (s *RPC) imgCommitHndl(id uint64, params json.RawMessage) (rr jrpc.Response) {
 	var fileID string
 	if err := json.Unmarshal(params, &fileID); err != nil {
@@ -158,4 +158,9 @@ func TestRPC_imgInfoHndl(t *testing.T) {
 	info, err = ri.Info()
 	assert.NoError(t, err)
 	assert.False(t, info.FirstStagingImageTS.IsZero())
+
+	err = ri.Delete("test_img")
+	assert.NoError(t, err)
+	_, err = ri.Load("test_img")
+	assert.EqualError(t, err, "image test_img not found")
 }
@@ -60,6 +60,7 @@ func (s *RPC) addHandlers() {
 		"save_with_id":        s.imgSaveWithIDHndl,
 		"reset_cleanup_timer": s.imgResetClnTimerHndl,
 		"load":                s.imgLoadHndl,
+		"delete":              s.imgDeleteHndl,
 		"commit":              s.imgCommitHndl,
 		"cleanup":             s.imgCleanupHndl,
 		"info":                s.imgInfoHndl,
@@ -21,7 +21,7 @@ import (
 )

 func chooseRandomUnusedPort() (port int) {
-	for i := 0; i < 10; i++ {
+	for range 10 {
 		port = 40000 + int(rand.Int31n(10000))
 		if ln, err := net.Listen("tcp", fmt.Sprintf(":%d", port)); err == nil {
 			_ = ln.Close()
@@ -34,7 +34,7 @@ func chooseRandomUnusedPort() (port int) {
 func waitForHTTPServerStart(port int) {
 	// wait for up to 3 seconds for server to start before returning it
 	client := http.Client{Timeout: time.Second}
-	for i := 0; i < 300; i++ {
+	for range 300 {
 		time.Sleep(time.Millisecond * 10)
 		if resp, err := client.Get(fmt.Sprintf("http://localhost:%d", port)); err == nil {
 			_ = resp.Body.Close()
@@ -7,7 +7,7 @@ import (
 	log "github.com/go-pkgz/lgr"
 	bolt "go.etcd.io/bbolt"

-	"github.com/go-pkgz/auth/avatar"
+	"github.com/go-pkgz/auth/v2/avatar"
 )

 // AvatarCommand set of flags and command for avatar migration
@@ -5,7 +5,7 @@ import (
 	"os"
 	"testing"

-	"github.com/go-pkgz/auth/avatar"
+	"github.com/go-pkgz/auth/v2/avatar"
 	"github.com/jessevdk/go-flags"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -47,7 +47,7 @@ func (ec *BackupCommand) Execute(_ []string) error {
 	req.SetBasicAuth("admin", ec.AdminPasswd)

 	// get with timeout
-	resp, err := client.Do(req.WithContext(ctx))
+	resp, err := client.Do(req.WithContext(ctx)) //nolint:gosec // exportURL is built from operator-supplied CLI flags, not user input
 	if err != nil {
 		return fmt.Errorf("request failed for %s: %w", exportURL, err)
 	}
@@ -1,10 +1,12 @@
 package cmd

 import (
+	"encoding/base64"
 	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"os"
+	"strings"
 	"testing"

 	"github.com/jessevdk/go-flags"
@@ -16,6 +18,10 @@ func TestBackup_Execute(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		assert.Equal(t, r.URL.Path, "/api/v1/admin/export")
 		assert.Equal(t, "GET", r.Method)
+		t.Logf("Authorization header: %+v", r.Header.Get("Authorization"))
+		auth, err := base64.StdEncoding.DecodeString(strings.Split(r.Header.Get("Authorization"), " ")[1])
+		require.NoError(t, err)
+		assert.Equal(t, "admin:secret", string(auth))
 		fmt.Fprint(w, "blah\nblah2\n12345678\n")
 	}))
 	defer ts.Close()
@@ -34,6 +40,28 @@ func TestBackup_Execute(t *testing.T) {
 	assert.Equal(t, "blah\nblah2\n12345678\n", string(data))
 }

+func TestBackup_ExecuteNoPassword(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, r.URL.Path, "/api/v1/admin/export")
+		assert.Equal(t, "GET", r.Method)
+		t.Logf("Authorization: %+v", r.Header.Get("Authorization"))
+		auth, err := base64.StdEncoding.DecodeString(strings.Split(r.Header.Get("Authorization"), " ")[1])
+		require.NoError(t, err)
+		require.Equal(t, "admin:", string(auth))
+		w.WriteHeader(http.StatusUnauthorized)
+		fmt.Fprint(w, "Unauthorized")
+	}))
+	defer ts.Close()
+
+	cmd := BackupCommand{}
+	cmd.SetCommon(CommonOpts{RemarkURL: ts.URL})
+	p := flags.NewParser(&cmd, flags.Default)
+	_, err := p.ParseArgs([]string{"--site=remark", "--path=/tmp", "--file={{.SITE}}-test.export"})
+	require.NoError(t, err)
+	err = cmd.Execute(nil)
+	assert.EqualError(t, err, "error response \"401 Unauthorized\", ensure you have set ADMIN_PASSWD and provided it to the command you're running: Unauthorized")
+}
+
 func TestBackup_ExecuteFailedStatus(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		assert.Equal(t, r.URL.Path, "/api/v1/admin/export")
@@ -77,7 +77,7 @@ func (cc *CleanupCommand) procSpam(comments []store.Comment) int {
 					log.Printf("[WARN] can't remove comment, %v", err)
 				}
 			}
-			comment.Text = strings.Replace(comment.Text, "\n", " ", -1)
+			comment.Text = strings.ReplaceAll(comment.Text, "\n", " ")
 			log.Printf("[SPAM] %+v [%.0f%%]", comment, score)
 		}
 	}
@@ -179,7 +179,7 @@ func (cc *CleanupCommand) listComments(postURL string) ([]store.Comment, error)

 	commentsWithInfo := struct {
 		Comments []store.Comment `json:"comments"`
-		Info     store.PostInfo  `json:"info,omitempty"`
+		Info     store.PostInfo  `json:"info"`
 	}{}

 	if err = json.NewDecoder(r.Body).Decode(&commentsWithInfo); err != nil {
@@ -199,7 +199,7 @@ func (cc *CleanupCommand) deleteComment(c store.Comment) error { //nolint:dupl /

 	client := http.Client{}
 	defer client.CloseIdleConnections()
-	r, err := client.Do(req)
+	r, err := client.Do(req) //nolint:gosec // RemarkURL comes from operator CLI flag, not user input
 	if err != nil {
 		return fmt.Errorf("delete request failed for comment %s, %s: %w", c.ID, c.Locator.URL, err)
 	}
@@ -221,7 +221,7 @@ func (cc *CleanupCommand) setTitle(c store.Comment) error { //nolint:dupl // not

 	client := http.Client{}
 	defer client.CloseIdleConnections()
-	r, err := client.Do(req)
+	r, err := client.Do(req) //nolint:gosec // RemarkURL comes from operator CLI flag, not user input
 	if err != nil {
 		return fmt.Errorf("title request failed for comment %s, %s: %w", c.ID, c.Locator.URL, err)
 	}
@@ -46,7 +46,6 @@ func TestCleanup_IsSpam(t *testing.T) {
 	}

 	for n, tt := range tbl {
-		tt := tt
 		checkName := fmt.Sprintf("check-%d-%s", n, tt.name)
 		t.Run(checkName, func(t *testing.T) {
 			c := store.Comment{ID: checkName, Text: tt.text, Score: tt.score}
@@ -174,7 +173,7 @@ func cleanupRoutes(t *testing.T, r *chi.Mux, c *cleanedComments) {

 		commentsWithInfo := struct {
 			Comments []store.Comment `json:"comments"`
-			Info     store.PostInfo  `json:"info,omitempty"`
+			Info     store.PostInfo  `json:"info"`
 		}{}

 		switch r.URL.Query().Get("url") {
@@ -195,7 +194,7 @@ func cleanupRoutes(t *testing.T, r *chi.Mux, c *cleanedComments) {
 		require.NoError(t, json.NewEncoder(w).Encode(commentsWithInfo))
 	})

-	r.HandleFunc("/api/v1/admin/comment/{id}", func(w http.ResponseWriter, r *http.Request) {
+	r.HandleFunc("/api/v1/admin/comment/{id}", func(_ http.ResponseWriter, r *http.Request) {
 		require.Equal(t, "DELETE", r.Method)
 		t.Log("delete ", r.URL.Path)
 		c.lock.Lock()
@@ -203,7 +202,7 @@ func cleanupRoutes(t *testing.T, r *chi.Mux, c *cleanedComments) {
 		c.lock.Unlock()
 	})

-	r.HandleFunc("/api/v1/admin/title/{id}", func(w http.ResponseWriter, r *http.Request) {
+	r.HandleFunc("/api/v1/admin/title/{id}", func(_ http.ResponseWriter, r *http.Request) {
 		require.Equal(t, "PUT", r.Method)
 		t.Log("title for ", r.URL.Path)
 		c.lock.Lock()
@@ -115,13 +115,16 @@ func responseError(resp *http.Response) error {
 	if e != nil {
 		body = []byte("")
 	}
+	if resp.StatusCode == http.StatusUnauthorized {
+		return fmt.Errorf("error response %q, ensure you have set ADMIN_PASSWD and provided it to the command you're running: %s", resp.Status, body)
+	}
 	return fmt.Errorf("error response %q, %s", resp.Status, body)
 }

 // mkdir -p for all dirs
 func makeDirs(dirs ...string) error {
 	for _, dir := range dirs {
-		if err := os.MkdirAll(dir, 0o700); err != nil { // If path is already a directory, MkdirAll does nothing
+		if err := os.MkdirAll(dir, 0o700); err != nil { // if path is already a directory, MkdirAll does nothing
 			return fmt.Errorf("can't make directory %s: %w", dir, err)
 		}
 	}
@@ -42,7 +42,7 @@ func (ic *ImportCommand) Execute(_ []string) error {
 	}
 	req.SetBasicAuth("admin", ic.AdminPasswd)

-	resp, err := client.Do(req.WithContext(ctx)) // closes request's reader
+	resp, err := client.Do(req.WithContext(ctx)) //nolint:gosec // importURL built from operator CLI flags, not user input; closes request's reader
 	if err != nil {
 		return fmt.Errorf("request failed for %s: %w", importURL, err)
 	}
@@ -1,10 +1,12 @@
 package cmd

 import (
+	"encoding/base64"
 	"fmt"
 	"io"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 	"time"

@@ -18,6 +20,10 @@ func TestImport_Execute(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		assert.Equal(t, r.URL.Path, "/api/v1/admin/import")
 		assert.Equal(t, "POST", r.Method)
+		t.Logf("Authorization header: %+v", r.Header.Get("Authorization"))
+		auth, err := base64.StdEncoding.DecodeString(strings.Split(r.Header.Get("Authorization"), " ")[1])
+		require.NoError(t, err)
+		assert.Equal(t, "admin:secret", string(auth))
 		body, err := io.ReadAll(r.Body)
 		assert.NoError(t, err)
 		assert.Equal(t, "blah\nblah2\n12345678\n", string(body))
@@ -46,6 +52,42 @@ func TestImport_Execute(t *testing.T) {
 	assert.NoError(t, err)
 }

+func TestImport_ExecuteNoPassword(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, r.URL.Path, "/api/v1/admin/import")
+		assert.Equal(t, "POST", r.Method)
+		t.Logf("Authorization header: %+v", r.Header.Get("Authorization"))
+		auth, err := base64.StdEncoding.DecodeString(strings.Split(r.Header.Get("Authorization"), " ")[1])
+		require.NoError(t, err)
+		assert.Equal(t, "admin:", string(auth))
+		body, err := io.ReadAll(r.Body)
+		assert.NoError(t, err)
+		assert.Equal(t, "blah\nblah2\n12345678\n", string(body))
+
+		w.WriteHeader(401)
+		fmt.Fprint(w, "Unauthorized")
+	}))
+	defer ts.Close()
+
+	cmd := ImportCommand{}
+	cmd.SetCommon(CommonOpts{RemarkURL: ts.URL})
+
+	p := flags.NewParser(&cmd, flags.Default)
+	_, err := p.ParseArgs([]string{"--site=remark", "--file=testdata/import.txt"})
+	require.NoError(t, err)
+	err = cmd.Execute(nil)
+	assert.EqualError(t, err, "error response \"401 Unauthorized\", ensure you have set ADMIN_PASSWD and provided it to the command you're running: Unauthorized")
+
+	cmd = ImportCommand{}
+	cmd.SetCommon(CommonOpts{RemarkURL: ts.URL})
+
+	p = flags.NewParser(&cmd, flags.Default)
+	_, err = p.ParseArgs([]string{"--site=remark", "--file=testdata/import.txt.gz"})
+	require.NoError(t, err)
+	err = cmd.Execute(nil)
+	assert.EqualError(t, err, "error response \"401 Unauthorized\", ensure you have set ADMIN_PASSWD and provided it to the command you're running: Unauthorized")
+}
+
 func TestImport_ExecuteFailed(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		assert.Equal(t, r.URL.Path, "/api/v1/admin/import")
@@ -34,13 +34,13 @@ func (rc *RemapCommand) Execute(_ []string) error {
 	ctx, cancel := context.WithTimeout(context.Background(), rc.Timeout)
 	defer cancel()
 	remapURL := fmt.Sprintf("%s/api/v1/admin/remap?site=%s", rc.RemarkURL, rc.Site)
-	req, err := http.NewRequest(http.MethodPost, remapURL, rulesReader)
+	req, err := http.NewRequest(http.MethodPost, remapURL, rulesReader) //nolint:gosec // RemarkURL is operator CLI flag, not user input
 	if err != nil {
 		return fmt.Errorf("can't make remap request for %s: %w", remapURL, err)
 	}
 	req.SetBasicAuth("admin", rc.AdminPasswd)

-	resp, err := client.Do(req.WithContext(ctx))
+	resp, err := client.Do(req.WithContext(ctx)) //nolint:gosec // see above
 	if err != nil {
 		return fmt.Errorf("request failed for %s: %w", remapURL, err)
 	}
@@ -1,9 +1,12 @@
 package cmd

 import (
+	"encoding/base64"
+	"fmt"
 	"io"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"

 	"github.com/jessevdk/go-flags"
@@ -16,6 +19,10 @@ func TestRemap_Execute(t *testing.T) {
 		assert.Equal(t, r.URL.Path, "/api/v1/admin/remap")
 		assert.Equal(t, "POST", r.Method)
 		assert.Equal(t, "remark", r.URL.Query().Get("site"))
+		t.Logf("Authorization header: %+v", r.Header.Get("Authorization"))
+		auth, err := base64.StdEncoding.DecodeString(strings.Split(r.Header.Get("Authorization"), " ")[1])
+		require.NoError(t, err)
+		assert.Equal(t, "admin:secret", string(auth))
 		body, err := io.ReadAll(r.Body)
 		assert.NoError(t, err)
 		assert.Equal(t, "http://oldsite.com* https://newsite.com*\nhttp://oldsite.com/from-old-page/1 https://newsite.com/to-new-page/1", string(body))
@@ -33,3 +40,31 @@ func TestRemap_Execute(t *testing.T) {
 	err = cmd.Execute(nil)
 	assert.NoError(t, err)
 }
+
+func TestRemap_ExecuteNoPassword(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, r.URL.Path, "/api/v1/admin/remap")
+		assert.Equal(t, "POST", r.Method)
+		assert.Equal(t, "remark", r.URL.Query().Get("site"))
+		t.Logf("Authorization header: %+v", r.Header.Get("Authorization"))
+		auth, err := base64.StdEncoding.DecodeString(strings.Split(r.Header.Get("Authorization"), " ")[1])
+		require.NoError(t, err)
+		assert.Equal(t, "admin:", string(auth))
+		body, err := io.ReadAll(r.Body)
+		assert.NoError(t, err)
+		assert.Equal(t, "http://oldsite.com* https://newsite.com*\nhttp://oldsite.com/from-old-page/1 https://newsite.com/to-new-page/1", string(body))
+
+		w.WriteHeader(401)
+		fmt.Fprint(w, "Unauthorized")
+	}))
+	defer ts.Close()
+
+	cmd := RemapCommand{}
+	cmd.SetCommon(CommonOpts{RemarkURL: ts.URL})
+
+	p := flags.NewParser(&cmd, flags.Default)
+	_, err := p.ParseArgs([]string{"--site=remark", "--file=testdata/remap_urls.txt"})
+	require.NoError(t, err)
+	err = cmd.Execute(nil)
+	assert.EqualError(t, err, "error response \"401 Unauthorized\", ensure you have set ADMIN_PASSWD and provided it to the command you're running: Unauthorized")
+}
@@ -2,38 +2,44 @@ package cmd

 import (
 	"context"
+	"crypto/sha1" //nolint:gosec // used only for stable ID hashing, not for security
 	"embed"
+	"encoding/json"
 	"fmt"
+	"net"
 	"net/http"
 	"net/url"
 	"os"
 	"os/signal"
 	"path"
 	"regexp"
+	"slices"
 	"strings"
 	"syscall"
 	"time"

 	"github.com/go-pkgz/jrpc"
-	"github.com/go-pkgz/lcw/eventbus"
+	"github.com/go-pkgz/lcw/v2/eventbus"
 	log "github.com/go-pkgz/lgr"
 	ntf "github.com/go-pkgz/notify"
-	"github.com/golang-jwt/jwt"
+	"github.com/golang-jwt/jwt/v5"
 	"github.com/kyokomi/emoji/v2"
 	bolt "go.etcd.io/bbolt"
+	"golang.org/x/oauth2"

-	"github.com/go-pkgz/auth"
-	"github.com/go-pkgz/auth/avatar"
-	"github.com/go-pkgz/auth/provider"
-	"github.com/go-pkgz/auth/provider/sender"
-	"github.com/go-pkgz/auth/token"
-	cache "github.com/go-pkgz/lcw"
+	"github.com/go-pkgz/auth/v2"
+	"github.com/go-pkgz/auth/v2/avatar"
+	"github.com/go-pkgz/auth/v2/provider"
+	"github.com/go-pkgz/auth/v2/provider/sender"
+	"github.com/go-pkgz/auth/v2/token"
+	cache "github.com/go-pkgz/lcw/v2"

 	"github.com/umputun/remark42/backend/app/migrator"
 	"github.com/umputun/remark42/backend/app/notify"
 	"github.com/umputun/remark42/backend/app/providers"
 	"github.com/umputun/remark42/backend/app/rest/api"
 	"github.com/umputun/remark42/backend/app/rest/proxy"
+	"github.com/umputun/remark42/backend/app/safehttp"
 	"github.com/umputun/remark42/backend/app/store"
 	"github.com/umputun/remark42/backend/app/store/admin"
 	"github.com/umputun/remark42/backend/app/store/engine"
@@ -58,34 +64,36 @@ type ServerCommand struct {
 	SSL        SSLGroup        `group:"ssl" namespace:"ssl" env-namespace:"SSL"`
 	ImageProxy ImageProxyGroup `group:"image-proxy" namespace:"image-proxy" env-namespace:"IMAGE_PROXY"`

-	Sites            []string      `long:"site" env:"SITE" default:"remark" description:"site names" env-delim:","`
-	AnonymousVote    bool          `long:"anon-vote" env:"ANON_VOTE" description:"enable anonymous votes (works only with VOTES_IP enabled)"`
-	AdminPasswd      string        `long:"admin-passwd" env:"ADMIN_PASSWD" default:"" description:"admin basic auth password"`
-	BackupLocation   string        `long:"backup" env:"BACKUP_PATH" default:"./var/backup" description:"backups location"`
-	MaxBackupFiles   int           `long:"max-back" env:"MAX_BACKUP_FILES" default:"10" description:"max backups to keep"`
-	LegacyImageProxy bool          `long:"img-proxy" env:"IMG_PROXY" description:"[deprecated, use image-proxy.http2https] enable image proxy"`
-	MaxCommentSize   int           `long:"max-comment" env:"MAX_COMMENT_SIZE" default:"2048" description:"max comment size"`
-	MaxVotes         int           `long:"max-votes" env:"MAX_VOTES" default:"-1" description:"maximum number of votes per comment"`
-	RestrictVoteIP   bool          `long:"votes-ip" env:"VOTES_IP" description:"restrict votes from the same ip"`
-	DurationVoteIP   time.Duration `long:"votes-ip-time" env:"VOTES_IP_TIME" default:"5m" description:"same ip vote duration"`
-	LowScore         int           `long:"low-score" env:"LOW_SCORE" default:"-5" description:"low score threshold"`
-	CriticalScore    int           `long:"critical-score" env:"CRITICAL_SCORE" default:"-10" description:"critical score threshold"`
-	PositiveScore    bool          `long:"positive-score" env:"POSITIVE_SCORE" description:"enable positive score only"`
-	ReadOnlyAge      int           `long:"read-age" env:"READONLY_AGE" default:"0" description:"read-only age of comments, days"`
-	EditDuration     time.Duration `long:"edit-time" env:"EDIT_TIME" default:"5m" description:"edit window"`
-	AdminEdit        bool          `long:"admin-edit" env:"ADMIN_EDIT" description:"unlimited edit for admins"`
-	Port             int           `long:"port" env:"REMARK_PORT" default:"8080" description:"port"`
-	Address          string        `long:"address" env:"REMARK_ADDRESS" default:"" description:"listening address"`
-	WebRoot          string        `long:"web-root" env:"REMARK_WEB_ROOT" default:"./web" description:"web root directory"`
-	UpdateLimit      float64       `long:"update-limit" env:"UPDATE_LIMIT" default:"0.5" description:"updates/sec limit"`
-	RestrictedWords  []string      `long:"restricted-words" env:"RESTRICTED_WORDS" description:"words prohibited to use in comments" env-delim:","`
-	RestrictedNames  []string      `long:"restricted-names" env:"RESTRICTED_NAMES" description:"names prohibited to use by user" env-delim:","`
-	EnableEmoji      bool          `long:"emoji" env:"EMOJI" description:"enable emoji"`
-	SimpleView       bool          `long:"simple-view" env:"SIMPLE_VIEW" description:"minimal comment editor mode"`
-	ProxyCORS        bool          `long:"proxy-cors" env:"PROXY_CORS" description:"disable internal CORS and delegate it to proxy"`
-	AllowedHosts     []string      `long:"allowed-hosts" env:"ALLOWED_HOSTS" description:"limit hosts/sources allowed to embed comments" env-delim:","`
-	SubscribersOnly  bool          `long:"subscribers-only" env:"SUBSCRIBERS_ONLY" description:"enable commenting only for Patreon subscribers"`
-	DisableSignature bool          `long:"disable-signature" env:"DISABLE_SIGNATURE" description:"disable server signature in headers"`
+	Sites                      []string      `long:"site" env:"SITE" default:"remark" description:"site names" env-delim:","`
+	AnonymousVote              bool          `long:"anon-vote" env:"ANON_VOTE" description:"enable anonymous votes (works only with VOTES_IP enabled)"`
+	AdminPasswd                string        `long:"admin-passwd" env:"ADMIN_PASSWD" default:"" description:"admin basic auth password"`
+	BackupLocation             string        `long:"backup" env:"BACKUP_PATH" default:"./var/backup" description:"backups location"`
+	MaxBackupFiles             int           `long:"max-back" env:"MAX_BACKUP_FILES" default:"10" description:"max backups to keep"`
+	LegacyImageProxy           bool          `long:"img-proxy" env:"IMG_PROXY" description:"[deprecated, use image-proxy.http2https] enable image proxy"`
+	MinCommentSize             int           `long:"min-comment" env:"MIN_COMMENT_SIZE" default:"0" description:"min comment size"`
+	MaxCommentSize             int           `long:"max-comment" env:"MAX_COMMENT_SIZE" default:"2048" description:"max comment size"`
+	MaxVotes                   int           `long:"max-votes" env:"MAX_VOTES" default:"-1" description:"maximum number of votes per comment"`
+	RestrictVoteIP             bool          `long:"votes-ip" env:"VOTES_IP" description:"restrict votes from the same ip"`
+	DurationVoteIP             time.Duration `long:"votes-ip-time" env:"VOTES_IP_TIME" default:"5m" description:"same ip vote duration"`
+	LowScore                   int           `long:"low-score" env:"LOW_SCORE" default:"-5" description:"low score threshold"`
+	CriticalScore              int           `long:"critical-score" env:"CRITICAL_SCORE" default:"-10" description:"critical score threshold"`
+	PositiveScore              bool          `long:"positive-score" env:"POSITIVE_SCORE" description:"enable positive score only"`
+	ReadOnlyAge                int           `long:"read-age" env:"READONLY_AGE" default:"0" description:"read-only age of comments, days"`
+	EditDuration               time.Duration `long:"edit-time" env:"EDIT_TIME" default:"5m" description:"edit window; set to 0 to disable comment editing and staged image cleanup"`
+	AdminEdit                  bool          `long:"admin-edit" env:"ADMIN_EDIT" description:"unlimited edit for admins"`
+	Port                       int           `long:"port" env:"REMARK_PORT" default:"8080" description:"port"`
+	Address                    string        `long:"address" env:"REMARK_ADDRESS" default:"" description:"listening address"`
+	WebRoot                    string        `long:"web-root" env:"REMARK_WEB_ROOT" default:"./web" description:"web root directory"`
+	UpdateLimit                float64       `long:"update-limit" env:"UPDATE_LIMIT" default:"0.5" description:"updates/sec limit"`
+	RestrictedWords            []string      `long:"restricted-words" env:"RESTRICTED_WORDS" description:"words prohibited to use in comments" env-delim:","`
+	RestrictedNames            []string      `long:"restricted-names" env:"RESTRICTED_NAMES" description:"names prohibited to use by user" env-delim:","`
+	EnableEmoji                bool          `long:"emoji" env:"EMOJI" description:"enable emoji"`
+	SimpleView                 bool          `long:"simple-view" env:"SIMPLE_VIEW" description:"minimal comment editor mode"`
+	ProxyCORS                  bool          `long:"proxy-cors" env:"PROXY_CORS" description:"disable internal CORS and delegate it to proxy"`
+	AllowedHosts               []string      `long:"allowed-hosts" env:"ALLOWED_HOSTS" description:"limit hosts/sources allowed to embed comments via CSP 'frame-ancestors'" env-delim:","`
+	SubscribersOnly            bool          `long:"subscribers-only" env:"SUBSCRIBERS_ONLY" description:"enable commenting only for Patreon subscribers"`
+	DisableSignature           bool          `long:"disable-signature" env:"DISABLE_SIGNATURE" description:"disable server signature in headers"`
+	DisableFancyTextFormatting bool          `long:"disable-fancy-text-formatting" env:"DISABLE_FANCY_TEXT_FORMATTING" description:"disable fancy comments text formatting (replacement of quotes, dashes, fractions, etc)"`

 	Auth struct {
 		TTL struct {
@@ -93,30 +101,32 @@ type ServerCommand struct {
 			Cookie time.Duration `long:"cookie" env:"COOKIE" default:"200h" description:"auth cookie TTL"`
 		} `group:"ttl" namespace:"ttl" env-namespace:"TTL"`

-		SendJWTHeader bool   `long:"send-jwt-header" env:"SEND_JWT_HEADER" description:"send JWT as a header instead of cookie"`
+		SendJWTHeader bool   `long:"send-jwt-header" env:"SEND_JWT_HEADER" description:"send JWT as a header instead of server-set cookie; with this enabled, frontend stores the JWT in a client-side cookie (note: increases vulnerability to XSS attacks)"`
 		SameSite      string `long:"same-site" env:"SAME_SITE" description:"set same site policy for cookies" choice:"default" choice:"none" choice:"lax" choice:"strict" default:"default"` // nolint

-		Apple     AppleGroup `group:"apple" namespace:"apple" env-namespace:"APPLE" description:"Apple OAuth"`
-		Google    AuthGroup  `group:"google" namespace:"google" env-namespace:"GOOGLE" description:"Google OAuth"`
-		Github    AuthGroup  `group:"github" namespace:"github" env-namespace:"GITHUB" description:"Github OAuth"`
-		Facebook  AuthGroup  `group:"facebook" namespace:"facebook" env-namespace:"FACEBOOK" description:"Facebook OAuth"`
-		Microsoft AuthGroup  `group:"microsoft" namespace:"microsoft" env-namespace:"MICROSOFT" description:"Microsoft OAuth"`
-		Yandex    AuthGroup  `group:"yandex" namespace:"yandex" env-namespace:"YANDEX" description:"Yandex OAuth"`
-		Twitter   AuthGroup  `group:"twitter" namespace:"twitter" env-namespace:"TWITTER" description:"Twitter OAuth"`
-		Patreon   AuthGroup  `group:"patreon" namespace:"patreon" env-namespace:"PATREON" description:"Patreon OAuth"`
-		Telegram  bool       `long:"telegram" env:"TELEGRAM" description:"Enable Telegram auth (using token from telegram.token)"`
-		Dev       bool       `long:"dev" env:"DEV" description:"enable dev (local) oauth2"`
-		Anonymous bool       `long:"anon" env:"ANON" description:"enable anonymous login"`
+		Apple     AppleGroup         `group:"apple" namespace:"apple" env-namespace:"APPLE" description:"Apple OAuth"`
+		Google    AuthGroup          `group:"google" namespace:"google" env-namespace:"GOOGLE" description:"Google OAuth"`
+		Github    AuthGroup          `group:"github" namespace:"github" env-namespace:"GITHUB" description:"Github OAuth"`
+		Facebook  AuthGroup          `group:"facebook" namespace:"facebook" env-namespace:"FACEBOOK" description:"Facebook OAuth"`
+		Microsoft MicrosoftAuthGroup `group:"microsoft" namespace:"microsoft" env-namespace:"MICROSOFT" description:"Microsoft OAuth"`
+		Yandex    AuthGroup          `group:"yandex" namespace:"yandex" env-namespace:"YANDEX" description:"Yandex OAuth"`
+		Twitter   AuthGroup          `group:"twitter" namespace:"twitter" env-namespace:"TWITTER" description:"[deprecated, doesn't work] Twitter OAuth"`
+		Patreon   AuthGroup          `group:"patreon" namespace:"patreon" env-namespace:"PATREON" description:"Patreon OAuth"`
+		Discord   AuthGroup          `group:"discord" namespace:"discord" env-namespace:"DISCORD" description:"Discord OAuth"`
+		Custom    CustomAuthGroup    `group:"custom" namespace:"custom" env-namespace:"CUSTOM" description:"Custom OAuth2 provider"`
+		Telegram  bool               `long:"telegram" env:"TELEGRAM" description:"Enable Telegram auth (using token from telegram.token)"`
+		Dev       bool               `long:"dev" env:"DEV" description:"enable dev (local) oauth2"`
+		Anonymous bool               `long:"anon" env:"ANON" description:"enable anonymous login"`
 		Email     struct {
 			Enable       bool          `long:"enable" env:"ENABLE" description:"enable auth via email"`
 			From         string        `long:"from" env:"FROM" description:"from email address"`
 			Subject      string        `long:"subj" env:"SUBJ" default:"remark42 confirmation" description:"email's subject"`
 			ContentType  string        `long:"content-type" env:"CONTENT_TYPE" default:"text/html" description:"content type"`
 			Host         string        `long:"host" env:"HOST" description:"[deprecated, use --smtp.host] SMTP host"`
-			Port         int           `long:"port" env:"PORT" description:"[deprecated, use --smtp.port] SMTP password"`
-			SMTPPassword string        `long:"passwd" env:"PASSWD" description:"[deprecated, use --smtp.password] SMTP port"`
-			SMTPUserName string        `long:"user" env:"USER" description:"[deprecated, use --smtp.username] enable TLS"`
-			TLS          bool          `long:"tls" env:"TLS" description:"[deprecated, use --smtp.tls] SMTP TCP connection timeout"`
+			Port         int           `long:"port" env:"PORT" description:"[deprecated, use --smtp.port] SMTP port"`
+			SMTPPassword string        `long:"passwd" env:"PASSWD" description:"[deprecated, use --smtp.password] SMTP password"`
+			SMTPUserName string        `long:"user" env:"USER" description:"[deprecated, use --smtp.username] SMTP user name"`
+			TLS          bool          `long:"tls" env:"TLS" description:"[deprecated, use --smtp.tls] enable TLS"`
 			TimeOut      time.Duration `long:"timeout" env:"TIMEOUT" default:"10s" description:"[deprecated, use --smtp.timeout] SMTP TCP connection timeout"`
 			MsgTemplate  string        `long:"template" env:"TEMPLATE" description:"[deprecated] message template file" default:"email_confirmation_login.html.tmpl"`
 		} `group:"email" namespace:"email" env-namespace:"EMAIL"`
@@ -136,7 +146,7 @@ type ImageProxyGroup struct {

 // AppleGroup defines options for Apple auth params
 type AppleGroup struct {
-	CID                string `long:"cid" env:"CID" description:"Apple client ID"`
+	CID                string `long:"cid" env:"CID" description:"Apple client ID (App ID or Services ID)"`
 	TID                string `long:"tid" env:"TID" description:"Apple service ID"`
 	KID                string `long:"kid" env:"KID" description:"Private key ID"`
 	PrivateKeyFilePath string `long:"private-key-filepath" env:"PRIVATE_KEY_FILEPATH" description:"Private key file location" default:"/srv/var/apple.p8"`
@@ -148,6 +158,28 @@ type AuthGroup struct {
 	CSEC string `long:"csec" env:"CSEC" description:"OAuth client secret"`
 }

+// MicrosoftAuthGroup defines options group for Microsoft auth params
+type MicrosoftAuthGroup struct {
+	CID    string `long:"cid" env:"CID" description:"OAuth client ID"`
+	CSEC   string `long:"csec" env:"CSEC" description:"OAuth client secret"`
+	Tenant string `long:"tenant" env:"TENANT" description:"Azure AD tenant ID, domain, or 'common' (default)" default:"common"`
+}
+
+// CustomAuthGroup defines options group for custom OAuth2 provider params
+type CustomAuthGroup struct {
+	Name         string   `long:"name" env:"NAME" description:"custom provider name used in auth route"`
+	CID          string   `long:"cid" env:"CID" description:"OAuth client ID"`
+	CSEC         string   `long:"csec" env:"CSEC" description:"OAuth client secret"`
+	AuthURL      string   `long:"auth-url" env:"AUTH_URL" description:"OAuth authorization endpoint"`
+	TokenURL     string   `long:"token-url" env:"TOKEN_URL" description:"OAuth token endpoint"`
+	InfoURL      string   `long:"info-url" env:"INFO_URL" description:"OAuth user info endpoint"`
+	Scopes       []string `long:"scopes" env:"SCOPES" env-delim:"," description:"OAuth scopes"`
+	IDField      string   `long:"id-field" env:"ID_FIELD" default:"sub" description:"user info field used as unique id"`
+	NameField    string   `long:"name-field" env:"NAME_FIELD" default:"name" description:"user info field used as display name"`
+	PictureField string   `long:"picture-field" env:"PICTURE_FIELD" default:"picture" description:"user info field used as avatar url"`
+	EmailField   string   `long:"email-field" env:"EMAIL_FIELD" default:"email" description:"user info field used as email"`
+}
+
 // StoreGroup defines options group for store params
 type StoreGroup struct {
 	Type string `long:"type" env:"TYPE" description:"type of storage" choice:"bolt" choice:"rpc" default:"bolt"` // nolint
@@ -217,14 +249,15 @@ type TelegramGroup struct {

 // SMTPGroup defines options for SMTP server connection, used in auth and notify modules
 type SMTPGroup struct {
-	Host      string        `long:"host" env:"HOST" description:"SMTP host"`
-	Port      int           `long:"port" env:"PORT" description:"SMTP port"`
-	Username  string        `long:"username" env:"USERNAME" description:"SMTP user name"`
-	Password  string        `long:"password" env:"PASSWORD" description:"SMTP password"`
-	TLS       bool          `long:"tls" env:"TLS" description:"enable TLS"`
-	LoginAuth bool          `long:"login_auth" env:"LOGIN_AUTH" description:"enable LOGIN auth instead of PLAIN"`
-	StartTLS  bool          `long:"starttls" env:"STARTTLS" description:"enable StartTLS"`
-	TimeOut   time.Duration `long:"timeout" env:"TIMEOUT" default:"10s" description:"SMTP TCP connection timeout"`
+	Host               string        `long:"host" env:"HOST" description:"SMTP host"`
+	Port               int           `long:"port" env:"PORT" description:"SMTP port"`
+	Username           string        `long:"username" env:"USERNAME" description:"SMTP user name"`
+	Password           string        `long:"password" env:"PASSWORD" description:"SMTP password"`
+	TLS                bool          `long:"tls" env:"TLS" description:"enable TLS"`
+	InsecureSkipVerify bool          `long:"insecure_skip_verify" env:"INSECURE_SKIP_VERIFY" description:"skip certificate verification"`
+	LoginAuth          bool          `long:"login_auth" env:"LOGIN_AUTH" description:"enable LOGIN auth instead of PLAIN"`
+	StartTLS           bool          `long:"starttls" env:"STARTTLS" description:"enable StartTLS"`
+	TimeOut            time.Duration `long:"timeout" env:"TIMEOUT" default:"10s" description:"SMTP TCP connection timeout"`
 }

 // NotifyGroup defines options for notification
@@ -250,8 +283,8 @@ type NotifyGroup struct {
 	} `group:"slack" namespace:"slack" env-namespace:"SLACK"`
 	Webhook struct {
 		URL      string        `long:"url" env:"URL" description:"webhook URL for admin notifications"`
-		Template string        `long:"template" env:"TEMPLATE" description:"webhook authentication template" default:"{\"text\": \"{{.Text}}\"}"`
-		Headers  []string      `long:"headers" description:"webhook authentication headers in format --notify.webhook.headers=Header1:Value1,Value2,... [$NOTIFY_WEBHOOK_HEADERS]"` // env NOTIFY_WEBHOOK_HEADERS split in code bellow to allow , inside ""
+		Template string        `long:"template" env:"TEMPLATE" description:"webhook payload template (Go text/template); falls back to {\"text\": {{.Text | escapeJSONString}}} when empty"`
+		Headers  []string      `long:"headers" description:"webhook headers in format --notify.webhook.headers=Header1:Value1,Value2,... [$NOTIFY_WEBHOOK_HEADERS]"` // env NOTIFY_WEBHOOK_HEADERS split in code below to allow , inside ""
 		Timeout  time.Duration `long:"timeout" env:"TIMEOUT" description:"webhook timeout" default:"5s"`
 	} `group:"webhook" namespace:"webhook" env-namespace:"WEBHOOK"`
 }
@@ -309,6 +342,7 @@ func (s *ServerCommand) Execute(_ []string) error {
 	log.Printf("[INFO] start server on port %s:%d", s.Address, s.Port)
 	resetEnv(
 		"SECRET",
+		"AUTH_APPLE_KID",
 		"AUTH_GOOGLE_CSEC",
 		"AUTH_GITHUB_CSEC",
 		"AUTH_FACEBOOK_CSEC",
@@ -316,6 +350,8 @@ func (s *ServerCommand) Execute(_ []string) error {
 		"AUTH_TWITTER_CSEC",
 		"AUTH_YANDEX_CSEC",
 		"AUTH_PATREON_CSEC",
+		"AUTH_DISCORD_CSEC",
+		"AUTH_CUSTOM_CSEC",
 		"TELEGRAM_TOKEN",
 		"SMTP_PASSWORD",
 		"ADMIN_PASSWD",
@@ -402,6 +438,12 @@ func (s *ServerCommand) HandleDeprecatedFlags() (result []DeprecatedFlag) {
 	if s.Notify.Telegram.API != "https://api.telegram.org/bot" {
 		result = append(result, DeprecatedFlag{Old: "notify.telegram.api", Version: "1.9"})
 	}
+	if s.Auth.Twitter.CID != "" {
+		result = append(result, DeprecatedFlag{Old: "auth.twitter.cid", Version: "1.14"})
+	}
+	if s.Auth.Twitter.CSEC != "" {
+		result = append(result, DeprecatedFlag{Old: "auth.twitter.csec", Version: "1.14"})
+	}
 	return append(result, s.findDeprecatedFlagsCollisions()...)
 }

@@ -459,12 +501,87 @@ func stringsSetAndDifferent(s1, s2 string) bool {
 }

 func contains(s string, a []string) bool {
-	for _, t := range a {
-		if t == s {
-			return true
+	return slices.Contains(a, s)
+}
+
+var reservedCustomProviderNames = map[string]struct{}{
+	"email":     {},
+	"anonymous": {},
+	"google":    {},
+	"github":    {},
+	"facebook":  {},
+	"yandex":    {},
+	"twitter":   {},
+	"microsoft": {},
+	"patreon":   {},
+	"discord":   {},
+	"telegram":  {},
+	"dev":       {},
+	"apple":     {},
+}
+
+var validCustomProviderName = regexp.MustCompile(`^[a-z0-9][a-z0-9_-]*$`)
+
+func isReservedCustomProviderName(name string) bool {
+	_, ok := reservedCustomProviderNames[name]
+	return ok
+}
+
+func isValidCustomProviderName(name string) bool {
+	return validCustomProviderName.MatchString(name)
+}
+
+func customProviderSourceID(data provider.UserData, cfg CustomAuthGroup) string {
+	sourceID := data.Value(cfg.IDField)
+	if sourceID == "" {
+		sourceID = data.Value(cfg.EmailField)
+	}
+	if sourceID == "" {
+		sourceID = data.Value(cfg.NameField)
+	}
+	if sourceID == "" {
+		sourceID = data.Value(cfg.PictureField)
+	}
+	if sourceID == "" {
+		payload, err := json.Marshal(data)
+		if err != nil {
+			log.Printf("[WARN] failed to serialize custom oauth user data for ID fallback: %v", err)
+		} else {
+			sourceID = string(payload)
 		}
 	}
-	return false
+	if sourceID == "" || sourceID == "{}" {
+		log.Printf("[WARN] custom oauth provider returned no stable user identifier fields, falling back to hashed payload")
+	}
+	return sourceID
+}
+
+func (c CustomAuthGroup) isConfigured() bool {
+	return c.Name != "" || c.CID != "" || c.CSEC != "" || c.AuthURL != "" || c.TokenURL != "" || c.InfoURL != "" ||
+		len(c.Scopes) > 0 || c.IDField != "sub" || c.NameField != "name" || c.PictureField != "picture" || c.EmailField != "email"
+}
+
+func (c CustomAuthGroup) missingRequired() []string {
+	missing := []string{}
+	if c.Name == "" {
+		missing = append(missing, "AUTH_CUSTOM_NAME")
+	}
+	if c.CID == "" {
+		missing = append(missing, "AUTH_CUSTOM_CID")
+	}
+	if c.CSEC == "" {
+		missing = append(missing, "AUTH_CUSTOM_CSEC")
+	}
+	if c.AuthURL == "" {
+		missing = append(missing, "AUTH_CUSTOM_AUTH_URL")
+	}
+	if c.TokenURL == "" {
+		missing = append(missing, "AUTH_CUSTOM_TOKEN_URL")
+	}
+	if c.InfoURL == "" {
+		missing = append(missing, "AUTH_CUSTOM_INFO_URL")
+	}
+	return missing
 }

 // newServerApp prepares application and return it with all active parts
@@ -500,11 +617,12 @@ func (s *ServerCommand) newServerApp(ctx context.Context) (*serverApp, error) {
 		EditDuration:           s.EditDuration,
 		AdminEdits:             s.AdminEdit,
 		AdminStore:             adminStore,
+		MinCommentSize:         s.MinCommentSize,
 		MaxCommentSize:         s.MaxCommentSize,
 		MaxVotes:               s.MaxVotes,
 		PositiveScore:          s.PositiveScore,
 		ImageService:           imageService,
-		TitleExtractor:         service.NewTitleExtractor(http.Client{Timeout: time.Second * 5}),
+		TitleExtractor:         service.NewTitleExtractor(http.Client{Timeout: time.Second * 5, Transport: safehttp.Transport()}, s.getAllowedDomains()),
 		RestrictedWordsMatcher: service.NewRestrictedWordsMatcher(service.StaticRestrictedWordsLister{Words: s.RestrictedWords}),
 	}
 	dataService.RestrictSameIPVotes.Enabled = s.RestrictVoteIP
@@ -540,7 +658,7 @@ func (s *ServerCommand) newServerApp(ctx context.Context) (*serverApp, error) {
 		Cache:             loadingCache,
 		NativeImporter:    &migrator.Native{DataStore: dataService},
 		DisqusImporter:    &migrator.Disqus{DataStore: dataService},
-		WordPressImporter: &migrator.WordPress{DataStore: dataService},
+		WordPressImporter: &migrator.WordPress{DataStore: dataService, DisableFancyTextFormatting: s.DisableFancyTextFormatting},
 		CommentoImporter:  &migrator.Commento{DataStore: dataService},
 		NativeExporter:    &migrator.Native{DataStore: dataService},
 		URLMapperMaker:    migrator.NewURLMapper,
@@ -575,33 +693,35 @@ func (s *ServerCommand) newServerApp(ctx context.Context) (*serverApp, error) {
 	}

 	srv := &api.Rest{
-		Version:               s.Revision,
-		DataService:           dataService,
-		WebRoot:               s.WebRoot,
-		WebFS:                 webFS,
-		RemarkURL:             s.RemarkURL,
-		ImageProxy:            imgProxy,
-		CommentFormatter:      commentFormatter,
-		Migrator:              migr,
-		ReadOnlyAge:           s.ReadOnlyAge,
-		SharedSecret:          s.SharedSecret,
-		Authenticator:         authenticator,
-		Cache:                 loadingCache,
-		NotifyService:         notifyService,
-		TelegramService:       telegramService,
-		SSLConfig:             sslConfig,
-		UpdateLimiter:         s.UpdateLimit,
-		ImageService:          imageService,
-		EmailNotifications:    contains("email", s.Notify.Users),
-		TelegramNotifications: contains("telegram", s.Notify.Users) && telegramService != nil,
-		EmojiEnabled:          s.EnableEmoji,
-		AnonVote:              s.AnonymousVote && s.RestrictVoteIP,
-		SimpleView:            s.SimpleView,
-		ProxyCORS:             s.ProxyCORS,
-		AllowedAncestors:      s.AllowedHosts,
-		SendJWTHeader:         s.Auth.SendJWTHeader,
-		SubscribersOnly:       s.SubscribersOnly,
-		DisableSignature:      s.DisableSignature,
+		Version:                    s.Revision,
+		DataService:                dataService,
+		WebRoot:                    s.WebRoot,
+		WebFS:                      webFS,
+		RemarkURL:                  s.RemarkURL,
+		ImageProxy:                 imgProxy,
+		CommentFormatter:           commentFormatter,
+		Migrator:                   migr,
+		ReadOnlyAge:                s.ReadOnlyAge,
+		SharedSecret:               s.SharedSecret,
+		Authenticator:              authenticator,
+		Cache:                      loadingCache,
+		NotifyService:              notifyService,
+		TelegramService:            telegramService,
+		SSLConfig:                  sslConfig,
+		UpdateLimiter:              s.UpdateLimit,
+		ImageService:               imageService,
+		EmailNotifications:         contains("email", s.Notify.Users),
+		TelegramNotifications:      contains("telegram", s.Notify.Users) && telegramService != nil,
+		EmojiEnabled:               s.EnableEmoji,
+		AnonVote:                   s.AnonymousVote && s.RestrictVoteIP,
+		SimpleView:                 s.SimpleView,
+		ProxyCORS:                  s.ProxyCORS,
+		AllowedAncestors:           s.AllowedHosts,
+		SendJWTHeader:              s.Auth.SendJWTHeader,
+		SubscribersOnly:            s.SubscribersOnly,
+		DisableSignature:           s.DisableSignature,
+		DisableFancyTextFormatting: s.DisableFancyTextFormatting,
+		ExternalImageProxy:         s.ImageProxy.CacheExternal,
 	}

 	srv.ScoreThresholds.Low, srv.ScoreThresholds.Critical = s.LowScore, s.CriticalScore
@@ -633,6 +753,83 @@ func (s *ServerCommand) newServerApp(ctx context.Context) (*serverApp, error) {
 	}, nil
 }

+// Extract domains from s.AllowedHosts and second level domain from s.RemarkURL.
+// It can be and IP like http://127.0.0.1 in which case we need to use whole IP as domain
+// Beware, if s.RemarkURL is in third-level domain like https://example.co.uk, co.uk will be returned.
+func (s *ServerCommand) getAllowedDomains() []string {
+	rawDomains := s.AllowedHosts
+	rawDomains = append(rawDomains, s.RemarkURL)
+	allowedDomains := []string{}
+	for _, rawURL := range rawDomains {
+		// case of 'self' AllowedHosts, which is not a valid rawURL name
+		if rawURL == "self" || rawURL == "'self'" || rawURL == "\"self\"" {
+			continue
+		}
+		// AllowedHosts usually don't have https:// prefix, so we're adding it just to make parsing below work the same way as for RemarkURL
+		if !strings.HasPrefix(rawURL, "http://") && !strings.HasPrefix(rawURL, "https://") {
+			rawURL = "https://" + rawURL
+		}
+		parsedURL, err := url.Parse(rawURL)
+		if err != nil {
+			log.Printf("[WARN] failed to parse URL %s for TitleExtract whitelist: %v", rawURL, err)
+			continue
+		}
+		domain := parsedURL.Hostname()
+
+		if domain == "" || // don't add empty domain as it will allow everything to be extracted
+			(len(strings.Split(domain, ".")) < 2 && // don't allow single-word domains like "com"
+				domain != "localhost") { // localhost is an exceptional single-word domain which is allowed
+			continue
+		}
+
+		// only for RemarkURL if domain is not IP and has more than two levels, extract second level domain.
+		// for AllowedHosts we don't do this as they are exact list of domains which can host comments, but
+		// remarkURL might be on a subdomain and we must allow parent domain to be used for TitleExtract.
+		if rawURL == s.RemarkURL && net.ParseIP(domain) == nil && len(strings.Split(domain, ".")) > 2 {
+			domain = strings.Join(strings.Split(domain, ".")[len(strings.Split(domain, "."))-2:], ".")
+		}
+
+		allowedDomains = append(allowedDomains, domain)
+	}
+	return allowedDomains
+}
+
+// getAllowedRedirectHosts normalises s.AllowedHosts into the form that
+// go-pkgz/auth's redirect validator expects. Strips http(s) schemes and
+// paths; preserves explicit ports (the validator matches both host-only
+// and host:port, so an entry without a port accepts any port while an
+// entry with a port restricts to that port). Skips CSP sentinels
+// ('self' / "self") and wildcard entries (*, *.example.com) that are
+// valid CSP source expressions but not valid hostnames.
+func (s *ServerCommand) getAllowedRedirectHosts() []string {
+	out := make([]string, 0, len(s.AllowedHosts))
+	for _, raw := range s.AllowedHosts {
+		raw = strings.TrimSpace(raw)
+		if raw == "" || raw == "self" || raw == "'self'" || raw == `"self"` {
+			continue
+		}
+		if strings.ContainsRune(raw, '*') { // CSP wildcard, not a host
+			continue
+		}
+		// add scheme so url.Parse populates Hostname()/Host consistently for bare hosts
+		toParse := raw
+		if !strings.HasPrefix(toParse, "http://") && !strings.HasPrefix(toParse, "https://") {
+			toParse = "https://" + toParse
+		}
+		u, err := url.Parse(toParse)
+		if err != nil || u.Hostname() == "" {
+			log.Printf("[WARN] skipping invalid AllowedHosts entry %q for redirect allowlist: %v", raw, err)
+			continue
+		}
+		if u.Port() != "" {
+			out = append(out, u.Host) // preserve explicit host:port so allowlist is port-specific
+			continue
+		}
+		out = append(out, u.Hostname())
+	}
+	return out
+}
+
 // Run all application objects
 func (a *serverApp) run(ctx context.Context) error {
 	if a.AdminPasswd != "" {
@@ -822,27 +1019,28 @@ func (s *ServerCommand) makeAdminStore() (admin.Store, error) {

 func (s *ServerCommand) makeCache() (LoadingCache, error) {
 	log.Printf("[INFO] make cache, type=%s", s.Cache.Type)
+	o := cache.NewOpts[[]byte]()
 	switch s.Cache.Type {
 	case "redis_pub_sub":
 		redisPubSub, err := eventbus.NewRedisPubSub(s.Cache.RedisAddr, "remark42-cache")
 		if err != nil {
 			return nil, fmt.Errorf("cache backend initialization, redis PubSub initialisation: %w", err)
 		}
-		backend, err := cache.NewLruCache(cache.MaxCacheSize(s.Cache.Max.Size), cache.MaxValSize(s.Cache.Max.Value),
-			cache.MaxKeys(s.Cache.Max.Items), cache.EventBus(redisPubSub))
+		backend, err := cache.NewLruCache(o.MaxCacheSize(s.Cache.Max.Size), o.MaxValSize(s.Cache.Max.Value),
+			o.MaxKeys(s.Cache.Max.Items), o.EventBus(redisPubSub))
 		if err != nil {
 			return nil, fmt.Errorf("cache backend initialization: %w", err)
 		}
-		return cache.NewScache(backend), nil
+		return cache.NewScache[[]byte](backend), nil
 	case "mem":
-		backend, err := cache.NewLruCache(cache.MaxCacheSize(s.Cache.Max.Size), cache.MaxValSize(s.Cache.Max.Value),
-			cache.MaxKeys(s.Cache.Max.Items))
+		backend, err := cache.NewLruCache(o.MaxCacheSize(s.Cache.Max.Size), o.MaxValSize(s.Cache.Max.Value),
+			o.MaxKeys(s.Cache.Max.Items))
 		if err != nil {
 			return nil, fmt.Errorf("cache backend initialization: %w", err)
 		}
-		return cache.NewScache(backend), nil
+		return cache.NewScache[[]byte](backend), nil
 	case "none":
-		return cache.NewScache(&cache.Nop{}), nil
+		return cache.NewScache[[]byte](&cache.Nop[[]byte]{}), nil
 	}
 	return nil, fmt.Errorf("unsupported cache type %s", s.Cache.Type)
 }
@@ -857,10 +1055,9 @@ func (s *ServerCommand) addAuthProviders(authenticator *auth.Service) error {
 	if s.Auth.Apple.CID != "" && s.Auth.Apple.TID != "" && s.Auth.Apple.KID != "" {
 		err := authenticator.AddAppleProvider(
 			provider.AppleConfig{
-				ClientID:     s.Auth.Apple.CID,
-				TeamID:       s.Auth.Apple.TID,
-				KeyID:        s.Auth.Apple.KID,
-				ResponseMode: "query", // default is form_post which wouldn't work here
+				ClientID: s.Auth.Apple.CID,
+				TeamID:   s.Auth.Apple.TID,
+				KeyID:    s.Auth.Apple.KID,
 			},
 			provider.LoadApplePrivateKeyFromFile(s.Auth.Apple.PrivateKeyFilePath),
 		)
@@ -882,7 +1079,7 @@ func (s *ServerCommand) addAuthProviders(authenticator *auth.Service) error {
 		providersCount++
 	}
 	if s.Auth.Microsoft.CID != "" && s.Auth.Microsoft.CSEC != "" {
-		authenticator.AddProvider("microsoft", s.Auth.Microsoft.CID, s.Auth.Microsoft.CSEC)
+		authenticator.AddMicrosoftProvider(s.Auth.Microsoft.CID, s.Auth.Microsoft.CSEC, s.Auth.Microsoft.Tenant)
 		providersCount++
 	}
 	if s.Auth.Yandex.CID != "" && s.Auth.Yandex.CSEC != "" {
@@ -897,6 +1094,49 @@ func (s *ServerCommand) addAuthProviders(authenticator *auth.Service) error {
 		authenticator.AddProvider("patreon", s.Auth.Patreon.CID, s.Auth.Patreon.CSEC)
 		providersCount++
 	}
+	if s.Auth.Discord.CID != "" && s.Auth.Discord.CSEC != "" {
+		authenticator.AddProvider("discord", s.Auth.Discord.CID, s.Auth.Discord.CSEC)
+		providersCount++
+	}
+
+	if s.Auth.Custom.isConfigured() {
+		missing := s.Auth.Custom.missingRequired()
+		if len(missing) > 0 {
+			return fmt.Errorf("custom oauth provider configuration is incomplete, missing: %s", strings.Join(missing, ", "))
+		}
+
+		customName := strings.ToLower(strings.TrimSpace(s.Auth.Custom.Name))
+		if !isValidCustomProviderName(customName) {
+			return fmt.Errorf("custom oauth provider name %q is invalid, expected pattern %q", customName, validCustomProviderName.String())
+		}
+		if isReservedCustomProviderName(customName) {
+			return fmt.Errorf("custom oauth provider name %q is reserved", customName)
+		}
+
+		authenticator.AddCustomProvider(customName, auth.Client{Cid: s.Auth.Custom.CID, Csecret: s.Auth.Custom.CSEC}, provider.CustomHandlerOpt{
+			Endpoint: oauth2.Endpoint{
+				AuthURL:  s.Auth.Custom.AuthURL,
+				TokenURL: s.Auth.Custom.TokenURL,
+			},
+			InfoURL: s.Auth.Custom.InfoURL,
+			Scopes:  s.Auth.Custom.Scopes,
+			MapUserFn: func(data provider.UserData, _ []byte) token.User {
+				sourceID := customProviderSourceID(data, s.Auth.Custom)
+				hashID := token.HashID(sha1.New(), sourceID) //nolint:gosec // stable provider user id hash
+				user := token.User{
+					ID:      customName + "_" + hashID,
+					Name:    data.Value(s.Auth.Custom.NameField),
+					Picture: data.Value(s.Auth.Custom.PictureField),
+					Email:   data.Value(s.Auth.Custom.EmailField),
+				}
+				if user.Name == "" {
+					user.Name = "noname_" + hashID[:4]
+				}
+				return user
+			},
+		})
+		providersCount++
+	}

 	if s.Auth.Dev {
 		log.Print("[INFO] dev access enabled")
@@ -910,18 +1150,19 @@ func (s *ServerCommand) addAuthProviders(authenticator *auth.Service) error {

 	if s.Auth.Email.Enable {
 		params := sender.EmailParams{
-			Host:         s.SMTP.Host,
-			Port:         s.SMTP.Port,
-			SMTPUserName: s.SMTP.Username,
-			SMTPPassword: s.SMTP.Password,
-			TimeOut:      s.SMTP.TimeOut,
-			StartTLS:     s.SMTP.StartTLS,
-			LoginAuth:    s.SMTP.LoginAuth,
-			TLS:          s.SMTP.TLS,
-			Charset:      "UTF-8",
-			From:         s.Auth.Email.From,
-			Subject:      s.Auth.Email.Subject,
-			ContentType:  s.Auth.Email.ContentType,
+			Host:               s.SMTP.Host,
+			Port:               s.SMTP.Port,
+			SMTPUserName:       s.SMTP.Username,
+			SMTPPassword:       s.SMTP.Password,
+			TimeOut:            s.SMTP.TimeOut,
+			StartTLS:           s.SMTP.StartTLS,
+			LoginAuth:          s.SMTP.LoginAuth,
+			TLS:                s.SMTP.TLS,
+			InsecureSkipVerify: s.SMTP.InsecureSkipVerify,
+			Charset:            "UTF-8",
+			From:               s.Auth.Email.From,
+			Subject:            s.Auth.Email.Subject,
+			ContentType:        s.Auth.Email.ContentType,
 		}
 		sndr := sender.NewEmailClient(params, log.Default())
 		tmpl, err := templates.Read(s.Auth.Email.MsgTemplate)
@@ -958,7 +1199,7 @@ func (s *ServerCommand) addAuthProviders(authenticator *auth.Service) error {
 			}
 			return true, nil
 		}),
-			// Custom user ID generator, used to distinguish anonymous users with the same login
+			// custom user ID generator, used to distinguish anonymous users with the same login
 			// coming from different IPs
 			func(user string, r *http.Request) string {
 				return user + r.RemoteAddr
@@ -1043,14 +1284,14 @@ func (s *ServerCommand) makeNotifyDestinations(authenticator *auth.Service) ([]n
 			VerificationSubject: s.Notify.Email.VerificationSubject,
 			UnsubscribeURL:      s.RemarkURL + "/email/unsubscribe.html",
 			// TODO: uncomment after #560 frontend part is ready and URL is known
-			// SubscribeURL:        s.RemarkURL + "/subscribe.html?token=",
+			// subscribeURL:        s.RemarkURL + "/subscribe.html?token=",
 			TokenGenFn: func(userID, email, site string) (string, error) {
 				claims := token.Claims{
 					Handshake: &token.Handshake{ID: userID + "::" + email},
-					StandardClaims: jwt.StandardClaims{
-						Audience:  site,
-						ExpiresAt: time.Now().Add(100 * 365 * 24 * time.Hour).Unix(),
-						NotBefore: time.Now().Add(-1 * time.Minute).Unix(),
+					RegisteredClaims: jwt.RegisteredClaims{
+						Audience:  jwt.ClaimStrings{site},
+						ExpiresAt: jwt.NewNumericDate(time.Now().Add(100 * 365 * 24 * time.Hour)),
+						NotBefore: jwt.NewNumericDate(time.Now().Add(-1 * time.Minute)),
 						Issuer:    "remark42",
 					},
 				}
@@ -1065,16 +1306,17 @@ func (s *ServerCommand) makeNotifyDestinations(authenticator *auth.Service) ([]n
 			emailParams.AdminEmails = s.Admin.Shared.Email
 		}
 		smtpParams := ntf.SMTPParams{
-			Host:        s.SMTP.Host,
-			Port:        s.SMTP.Port,
-			TLS:         s.SMTP.TLS,
-			StartTLS:    s.SMTP.StartTLS,
-			LoginAuth:   s.SMTP.LoginAuth,
-			Username:    s.SMTP.Username,
-			Password:    s.SMTP.Password,
-			TimeOut:     s.SMTP.TimeOut,
-			ContentType: "text/html",
-			Charset:     "UTF-8",
+			Host:               s.SMTP.Host,
+			Port:               s.SMTP.Port,
+			TLS:                s.SMTP.TLS,
+			StartTLS:           s.SMTP.StartTLS,
+			InsecureSkipVerify: s.SMTP.InsecureSkipVerify,
+			LoginAuth:          s.SMTP.LoginAuth,
+			Username:           s.SMTP.Username,
+			Password:           s.SMTP.Password,
+			TimeOut:            s.SMTP.TimeOut,
+			ContentType:        "text/html",
+			Charset:            "UTF-8",
 		}
 		emailService, err := notify.NewEmail(emailParams, smtpParams)
 		if err != nil {
@@ -1145,6 +1387,12 @@ func (s *ServerCommand) getAuthenticator(ds *service.DataStore, avas avatar.Stor
 		SendJWTHeader:  s.Auth.SendJWTHeader,
 		SameSiteCookie: s.parseSameSite(s.Auth.SameSite),
 		SecureCookies:  strings.HasPrefix(s.RemarkURL, "https://"),
+		// enable the `from` redirect allowlist in go-pkgz/auth v2.1.2+ — limits
+		// post-auth redirects to RemarkURL's own host plus any configured
+		// AllowedHosts. Prevents the OAuth open-redirect / phishing vector.
+		AllowedRedirectHosts: token.AllowedHostsFunc(func() ([]string, error) {
+			return s.getAllowedRedirectHosts(), nil
+		}),
 		SecretReader: token.SecretFunc(func(aud string) (string, error) { // get secret per site
 			return admns.Key(aud)
 		}),
@@ -1152,10 +1400,16 @@ func (s *ServerCommand) getAuthenticator(ds *service.DataStore, avas avatar.Stor
 			if c.User == nil {
 				return c
 			}
-			c.User.SetAdmin(ds.IsAdmin(c.Audience, c.User.ID))
-			c.User.SetBoolAttr("blocked", ds.IsBlocked(c.Audience, c.User.ID))
+			// audience is a slice but we set it to a single element, and situation when there is no audience or there are more than one is unexpected
+			if len(c.Audience) != 1 {
+				return c
+			}
+			audience := c.Audience[0]
+
+			c.User.SetAdmin(ds.IsAdmin(audience, c.User.ID))
+			c.User.SetBoolAttr("blocked", ds.IsBlocked(audience, c.User.ID))
 			var err error
-			c.User.Email, err = ds.GetUserEmail(c.Audience, c.User.ID)
+			c.User.Email, err = ds.GetUserEmail(audience, c.User.ID)
 			if err != nil {
 				log.Printf("[WARN] can't read email for %s, %v", c.User.ID, err)
 			}
@@ -1175,7 +1429,7 @@ func (s *ServerCommand) getAuthenticator(ds *service.DataStore, avas avatar.Stor
 			return c
 		}),
 		AdminPasswd: s.AdminPasswd,
-		Validator: token.ValidatorFunc(func(token string, claims token.Claims) bool { // check on each auth call (in middleware)
+		Validator: token.ValidatorFunc(func(_ string, claims token.Claims) bool { // check on each auth call (in middleware)
 			if claims.User == nil {
 				return false
 			}
@@ -1277,20 +1531,21 @@ func splitAtCommas(s string) []string {

 // authRefreshCache used by authenticator to minimize repeatable token refreshes
 type authRefreshCache struct {
-	cache.LoadingCache
+	cache.LoadingCache[token.Claims]
 }

 func newAuthRefreshCache() *authRefreshCache {
-	expirableCache, _ := cache.NewExpirableCache(cache.TTL(5 * time.Minute))
+	o := cache.NewOpts[token.Claims]()
+	expirableCache, _ := cache.NewExpirableCache(o.TTL(5 * time.Minute))
 	return &authRefreshCache{LoadingCache: expirableCache}
 }

 // Get implements cache getter with key converted to string
-func (c *authRefreshCache) Get(key interface{}) (interface{}, bool) {
-	return c.LoadingCache.Peek(key.(string))
+func (c *authRefreshCache) Get(key string) (token.Claims, bool) {
+	return c.Peek(key)
 }

 // Set implements cache setter with key converted to string
-func (c *authRefreshCache) Set(key, value interface{}) {
-	_, _ = c.LoadingCache.Get(key.(string), func() (interface{}, error) { return value, nil })
+func (c *authRefreshCache) Set(key string, value token.Claims) {
+	_, _ = c.LoadingCache.Get(key, func() (token.Claims, error) { return value, nil })
 }
@@ -15,8 +15,9 @@ import (
 	"testing"
 	"time"

-	"github.com/go-pkgz/auth/token"
-	"github.com/golang-jwt/jwt"
+	"github.com/go-pkgz/auth/v2/provider"
+	"github.com/go-pkgz/auth/v2/token"
+	"github.com/golang-jwt/jwt/v5"
 	"github.com/jessevdk/go-flags"
 	"go.uber.org/goleak"

@@ -47,7 +48,7 @@ func TestServerApp(t *testing.T) {
 	// add comment
 	client := http.Client{Timeout: 10 * time.Second}
 	defer client.CloseIdleConnections()
-	req, err := http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment", port),
+	req, err := http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment?site=remark", port),
 		strings.NewReader(`{"text": "test 123", "locator":{"url": "https://radio-t.com/blah1", "site": "remark"}}`))
 	require.NoError(t, err)
 	req.SetBasicAuth("admin", "password")
@@ -79,7 +80,7 @@ func TestServerApp_DevMode(t *testing.T) {
 	waitForHTTPServerStart(port)

 	providers := app.restSrv.Authenticator.Providers()
-	require.Equal(t, 10+1, len(providers), "extra auth provider")
+	require.Equal(t, 11+1, len(providers), "extra auth provider")
 	assert.Equal(t, "dev", providers[len(providers)-2].Name(), "dev auth provider")
 	// send ping
 	resp, err := http.Get(fmt.Sprintf("http://localhost:%d/api/v1/ping", port))
@@ -95,6 +96,30 @@ func TestServerApp_DevMode(t *testing.T) {
 	app.Wait()
 }

+func TestServerApp_CustomOAuthProvider(t *testing.T) {
+	port := chooseRandomUnusedPort()
+	app, ctx, cancel := prepServerApp(t, func(o ServerCommand) ServerCommand {
+		o.Port = port
+		o.Auth.Custom.Name = "oidc"
+		o.Auth.Custom.CID = "cid"
+		o.Auth.Custom.CSEC = "csec"
+		o.Auth.Custom.AuthURL = "https://example.com/oauth2/authorize"
+		o.Auth.Custom.TokenURL = "https://example.com/oauth2/token"
+		o.Auth.Custom.InfoURL = "https://example.com/oauth2/userinfo"
+		return o
+	})
+
+	go func() { _ = app.run(ctx) }()
+	waitForHTTPServerStart(port)
+
+	providers := app.restSrv.Authenticator.Providers()
+	require.Equal(t, 11+1, len(providers), "extra auth provider")
+	assert.Equal(t, "oidc", providers[len(providers)-2].Name(), "custom auth provider")
+
+	cancel()
+	app.Wait()
+}
+
 func TestServerApp_AnonMode(t *testing.T) {
 	port := chooseRandomUnusedPort()
 	app, ctx, cancel := prepServerApp(t, func(o ServerCommand) ServerCommand {
@@ -107,7 +132,7 @@ func TestServerApp_AnonMode(t *testing.T) {
 	waitForHTTPServerStart(port)

 	providers := app.restSrv.Authenticator.Providers()
-	require.Equal(t, 10+1, len(providers), "extra auth provider for anon")
+	require.Equal(t, 11+1, len(providers), "extra auth provider for anon")
 	assert.Equal(t, "anonymous", providers[len(providers)-1].Name(), "anon auth provider")

 	client := http.Client{Timeout: 10 * time.Second}
@@ -129,7 +154,7 @@ func TestServerApp_AnonMode(t *testing.T) {
 	assert.Equal(t, http.StatusOK, resp.StatusCode)

 	// try to add a comment as good anonymous
-	req, err := http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment", port),
+	req, err := http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment?site=remark", port),
 		strings.NewReader(`{"text": "test 123", "locator":{"url": "https://radio-t.com/blah1", "site": "remark"}}`))
 	require.NoError(t, err)

@@ -194,7 +219,7 @@ func TestServerApp_AnonMode(t *testing.T) {

 	// try to add a comment as anonymous with admin name
 	time.Sleep(time.Second)
-	req, err = http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment", port),
+	req, err = http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment?site=remark", port),
 		strings.NewReader(`{"text": "test 123", "locator":{"url": "https://radio-t.com/blah1", "site": "remark"}}`))
 	require.NoError(t, err)

@@ -250,7 +275,7 @@ func TestServerApp_WithSSL(t *testing.T) {

 	client := http.Client{
 		// prevent http redirect
-		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+		CheckRedirect: func(*http.Request, []*http.Request) error {
 			return http.ErrUseLastResponse
 		},

@@ -389,6 +414,95 @@ func TestServerApp_Failed(t *testing.T) {
 		"failed to make authenticator: an AppleProvider creating failed: "+
 			"provided private key is not ECDSA")
 	t.Log(err)
+
+	// incomplete custom oauth config
+	opts = ServerCommand{}
+	opts.SetCommon(CommonOpts{RemarkURL: "https://demo.remark42.com", SharedSecret: "123456"})
+	p = flags.NewParser(&opts, flags.Default)
+	_, err = p.ParseArgs([]string{"--store.bolt.path=/tmp", "--backup=/tmp", "--image.fs.path=/tmp", "--auth.custom.name=oidc", "--auth.custom.cid=123"})
+	assert.NoError(t, err)
+	_, err = opts.newServerApp(context.Background())
+	assert.EqualError(t, err,
+		"failed to make authenticator: custom oauth provider configuration is incomplete, missing: "+
+			"AUTH_CUSTOM_CSEC, AUTH_CUSTOM_AUTH_URL, AUTH_CUSTOM_TOKEN_URL, AUTH_CUSTOM_INFO_URL")
+	t.Log(err)
+}
+
+func TestIsReservedCustomProviderName(t *testing.T) {
+	reserved := []string{
+		"email", "anonymous", "google", "github", "facebook", "yandex", "twitter",
+		"microsoft", "patreon", "discord", "telegram", "dev", "apple",
+	}
+
+	for _, name := range reserved {
+		t.Run(name, func(t *testing.T) {
+			assert.True(t, isReservedCustomProviderName(name))
+		})
+	}
+
+	assert.False(t, isReservedCustomProviderName("oidc"))
+}
+
+func TestIsValidCustomProviderName(t *testing.T) {
+	valid := []string{"oidc", "codeberg", "provider_1", "provider-1", "a1"}
+	for _, name := range valid {
+		t.Run("valid_"+name, func(t *testing.T) {
+			assert.True(t, isValidCustomProviderName(name))
+		})
+	}
+
+	invalid := []string{"", " has-space", "has space", "Uppercase", "provider!", "-provider", "_provider"}
+	for _, name := range invalid {
+		t.Run("invalid_"+strings.ReplaceAll(name, " ", "_"), func(t *testing.T) {
+			assert.False(t, isValidCustomProviderName(name))
+		})
+	}
+}
+
+func TestCustomProviderSourceID(t *testing.T) {
+	cfg := CustomAuthGroup{IDField: "sub", EmailField: "email", NameField: "name", PictureField: "picture"}
+
+	assert.Equal(t, "user-1", customProviderSourceID(provider.UserData{"sub": "user-1", "email": "a@example.com"}, cfg))
+	assert.Equal(t, "a@example.com", customProviderSourceID(provider.UserData{"email": "a@example.com"}, cfg))
+	assert.Equal(t, "alice", customProviderSourceID(provider.UserData{"name": "alice"}, cfg))
+	assert.Equal(t, "https://example.com/avatar.png", customProviderSourceID(provider.UserData{"picture": "https://example.com/avatar.png"}, cfg))
+	assert.Equal(t, `{"login":"alice"}`, customProviderSourceID(provider.UserData{"login": "alice"}, cfg))
+	assert.Equal(t, "{}", customProviderSourceID(provider.UserData{}, cfg))
+}
+
+func TestServerApp_InvalidCustomOAuthProviderName(t *testing.T) {
+	baseArgs := []string{
+		"--store.bolt.path=/tmp",
+		"--backup=/tmp",
+		"--image.fs.path=/tmp",
+		"--auth.custom.cid=123",
+		"--auth.custom.csec=456",
+		"--auth.custom.auth-url=https://example.com/oauth2/authorize",
+		"--auth.custom.token-url=https://example.com/oauth2/token",
+		"--auth.custom.info-url=https://example.com/oauth2/userinfo",
+	}
+
+	t.Run("reserved", func(t *testing.T) {
+		opts := ServerCommand{}
+		opts.SetCommon(CommonOpts{RemarkURL: "https://demo.remark42.com", SharedSecret: "123456"})
+		p := flags.NewParser(&opts, flags.Default)
+		_, err := p.ParseArgs(append(baseArgs, "--auth.custom.name=twitter"))
+		require.NoError(t, err)
+
+		_, err = opts.newServerApp(context.Background())
+		assert.EqualError(t, err, `failed to make authenticator: custom oauth provider name "twitter" is reserved`)
+	})
+
+	t.Run("not_url_safe", func(t *testing.T) {
+		opts := ServerCommand{}
+		opts.SetCommon(CommonOpts{RemarkURL: "https://demo.remark42.com", SharedSecret: "123456"})
+		p := flags.NewParser(&opts, flags.Default)
+		_, err := p.ParseArgs(append(baseArgs, "--auth.custom.name=bad name"))
+		require.NoError(t, err)
+
+		_, err = opts.newServerApp(context.Background())
+		assert.EqualError(t, err, `failed to make authenticator: custom oauth provider name "bad name" is invalid, expected pattern "^[a-z0-9][a-z0-9_-]*$"`)
+	})
 }

 func TestServerApp_Shutdown(t *testing.T) {
@@ -457,6 +571,8 @@ func TestServerApp_DeprecatedArgs(t *testing.T) {
 		"--notify.telegram.token=abcd",
 		"--notify.telegram.timeout=3m",
 		"--notify.telegram.api=http://example.org",
+		"--auth.twitter.cid=123",
+		"--auth.twitter.csec=456",
 	}
 	assert.Empty(t, s.SMTP.Host)
 	assert.Empty(t, s.SMTP.Port)
@@ -482,6 +598,8 @@ func TestServerApp_DeprecatedArgs(t *testing.T) {
 			{Old: "notify.telegram.token", New: "telegram.token", Version: "1.9"},
 			{Old: "notify.telegram.timeout", New: "telegram.timeout", Version: "1.9"},
 			{Old: "notify.telegram.api", Version: "1.9"},
+			{Old: "auth.twitter.cid", Version: "1.14"},
+			{Old: "auth.twitter.csec", Version: "1.14"},
 		},
 		deprecatedFlags)
 	assert.Equal(t, "smtp.example.org", s.SMTP.Host)
@@ -605,11 +723,11 @@ func TestServerAuthHooks(t *testing.T) {
 	tkService.TokenDuration = time.Second

 	claims := token.Claims{
-		StandardClaims: jwt.StandardClaims{
-			Audience:  "remark",
+		RegisteredClaims: jwt.RegisteredClaims{
+			Audience:  jwt.ClaimStrings{"remark"},
 			Issuer:    "remark",
-			ExpiresAt: time.Now().Add(time.Second).Unix(),
-			NotBefore: time.Now().Add(-1 * time.Minute).Unix(),
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Second)),
+			NotBefore: jwt.NewNumericDate(time.Now().Add(-1 * time.Minute)),
 		},
 		User: &token.User{
 			ID:   "github_dev",
@@ -624,7 +742,7 @@ func TestServerAuthHooks(t *testing.T) {
 	defer client.CloseIdleConnections()

 	// add comment
-	req, err := http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment", port),
+	req, err := http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment?site=remark", port),
 		strings.NewReader(`{"text": "test 123", "locator":{"url": "https://radio-t.com/p/2018/12/29/podcast-630/", "site": "remark"}}`))
 	require.NoError(t, err)
 	req.Header.Set("X-JWT", tk)
@@ -633,13 +751,13 @@ func TestServerAuthHooks(t *testing.T) {
 	require.NoError(t, resp.Body.Close())
 	assert.Equal(t, http.StatusCreated, resp.StatusCode, "non-blocked user able to post")

-	// add comment with no-aud claim
-	claimsNoAud := claims
-	claimsNoAud.Audience = ""
-	tkNoAud, err := tkService.Token(claimsNoAud)
+	// try to add comment with no-aud claim
+	badClaimsNoAud := claims
+	badClaimsNoAud.Audience = jwt.ClaimStrings{""}
+	tkNoAud, err := tkService.Token(badClaimsNoAud)
 	require.NoError(t, err)
 	t.Logf("no-aud claims: %s", tkNoAud)
-	req, err = http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment", port),
+	req, err = http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment?site=remark", port),
 		strings.NewReader(`{"text": "test 123", "locator":{"url": "https://radio-t.com/p/2018/12/29/podcast-631/",
 	"site": "remark"}}`))
 	require.NoError(t, err)
@@ -651,6 +769,43 @@ func TestServerAuthHooks(t *testing.T) {
 	require.NoError(t, resp.Body.Close())
 	assert.Equal(t, http.StatusUnauthorized, resp.StatusCode, "user without aud claim rejected, \n"+tkNoAud+"\n"+string(body))

+	// try to add comment with multiple auds
+	badClaimsMultipleAud := claims
+	badClaimsMultipleAud.Audience = jwt.ClaimStrings{"remark", "second_aud"}
+	tkMultipleAuds, err := tkService.Token(badClaimsMultipleAud)
+	require.NoError(t, err)
+	t.Logf("multiple aud claims: %s", tkMultipleAuds)
+	req, err = http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment?site=remark", port),
+		strings.NewReader(`{"text": "test 123", "locator":{"url": "https://radio-t.com/p/2018/12/29/podcast-631/",
+	"site": "remark"}}`))
+	require.NoError(t, err)
+	req.Header.Set("X-JWT", tkMultipleAuds)
+	resp, err = client.Do(req)
+	require.NoError(t, err)
+	body, err = io.ReadAll(resp.Body)
+	require.NoError(t, err)
+	require.NoError(t, resp.Body.Close())
+	assert.Equal(t, http.StatusUnauthorized, resp.StatusCode, "user with multiple auds claim rejected, \n"+tkMultipleAuds+"\n"+string(body))
+
+	// try to add comment without user set
+	badClaimsNoUser := claims
+	badClaimsNoUser.Audience = jwt.ClaimStrings{"remark"}
+	badClaimsNoUser.User = nil
+	tkNoUser, err := tkService.Token(badClaimsNoUser)
+	require.NoError(t, err)
+	t.Logf("no user claims: %s", tkNoUser)
+	req, err = http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment?site=remark", port),
+		strings.NewReader(`{"text": "test 123", "locator":{"url": "https://radio-t.com/p/2018/12/29/podcast-631/",
+	"site": "remark"}}`))
+	require.NoError(t, err)
+	req.Header.Set("X-JWT", tkNoUser)
+	resp, err = client.Do(req)
+	require.NoError(t, err)
+	body, err = io.ReadAll(resp.Body)
+	require.NoError(t, err)
+	require.NoError(t, resp.Body.Close())
+	assert.Equal(t, http.StatusUnauthorized, resp.StatusCode, "user without user information rejected, \n"+tkNoUser+"\n"+string(body))
+
 	// block user github_dev as admin
 	req, err = http.NewRequest(http.MethodPut,
 		fmt.Sprintf("http://localhost:%d/api/v1/admin/user/github_dev?site=remark&block=1&ttl=10d", port), http.NoBody)
@@ -665,7 +820,7 @@ func TestServerAuthHooks(t *testing.T) {
 	t.Log(string(b))

 	// try add a comment with blocked user
-	req, err = http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment", port),
+	req, err = http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/api/v1/comment?site=remark", port),
 		strings.NewReader(`{"text": "test 123 blah", "locator":{"url": "https://radio-t.com/blah1", "site": "remark"}}`))
 	require.NoError(t, err)
 	req.Header.Set("X-JWT", tk)
@@ -697,7 +852,6 @@ func TestServerCommand_parseSameSite(t *testing.T) {

 	cmd := ServerCommand{}
 	for i, tt := range tbl {
-		tt := tt
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			assert.Equal(t, tt.res, cmd.parseSameSite(tt.inp))
 		})
@@ -726,8 +880,58 @@ func Test_splitAtCommas(t *testing.T) {
 	}
 }

+func Test_getAllowedDomains(t *testing.T) {
+	tbl := []struct {
+		s              ServerCommand
+		allowedDomains []string
+	}{
+		// correct example, parsed and returned as allowed domain
+		{ServerCommand{AllowedHosts: []string{}, CommonOpts: CommonOpts{RemarkURL: "https://remark42.example.org"}}, []string{"example.org"}},
+		{ServerCommand{AllowedHosts: []string{}, CommonOpts: CommonOpts{RemarkURL: "http://remark42.example.org"}}, []string{"example.org"}},
+		{ServerCommand{AllowedHosts: []string{}, CommonOpts: CommonOpts{RemarkURL: "http://localhost"}}, []string{"localhost"}},
+		// incorrect URLs, so Hostname is empty but returned list doesn't include empty string as it would allow any domain
+		{ServerCommand{AllowedHosts: []string{}, CommonOpts: CommonOpts{RemarkURL: "bad hostname"}}, []string{}},
+		{ServerCommand{AllowedHosts: []string{}, CommonOpts: CommonOpts{RemarkURL: "not_a_hostname"}}, []string{}},
+		// test removal of 'self', multiple AllowedHosts. No deduplication is expected
+		{ServerCommand{AllowedHosts: []string{"'self'", "example.org", "test.example.org", "remark42.com"}, CommonOpts: CommonOpts{RemarkURL: "https://example.org"}}, []string{"example.org", "test.example.org", "remark42.com", "example.org"}},
+	}
+	for i, tt := range tbl {
+		t.Run(strconv.Itoa(i), func(t *testing.T) {
+			assert.Equal(t, tt.allowedDomains, tt.s.getAllowedDomains())
+		})
+	}
+}
+
+func Test_getAllowedRedirectHosts(t *testing.T) {
+	tbl := []struct {
+		name  string
+		hosts []string
+		want  []string
+	}{
+		{name: "empty", hosts: nil, want: []string{}},
+		{name: "bare hostnames pass through", hosts: []string{"example.com", "admin.example.com"}, want: []string{"example.com", "admin.example.com"}},
+		{name: "https scheme stripped", hosts: []string{"https://example.com"}, want: []string{"example.com"}},
+		{name: "http scheme stripped", hosts: []string{"http://example.com"}, want: []string{"example.com"}},
+		{name: "scheme with path strips path", hosts: []string{"https://example.com/embed"}, want: []string{"example.com"}},
+		{name: "explicit port preserved as host:port", hosts: []string{"example.com:8080"}, want: []string{"example.com:8080"}},
+		{name: "scheme with explicit port preserved", hosts: []string{"https://example.com:8443"}, want: []string{"example.com:8443"}},
+		{name: "scheme without port stays bare host", hosts: []string{"https://example.com"}, want: []string{"example.com"}},
+		{name: "self sentinel filtered", hosts: []string{"'self'", "self", `"self"`, "example.com"}, want: []string{"example.com"}},
+		{name: "wildcards filtered", hosts: []string{"*", "*.example.com", "https://*.example.com", "example.com"}, want: []string{"example.com"}},
+		{name: "empty entries filtered", hosts: []string{"", "  ", "example.com"}, want: []string{"example.com"}},
+		{name: "mixed real-world", hosts: []string{"'self'", "https://blog.example.com", "admin.example.com:8443", "*.cdn.example.com"},
+			want: []string{"blog.example.com", "admin.example.com:8443"}},
+	}
+	for _, tt := range tbl {
+		t.Run(tt.name, func(t *testing.T) {
+			s := ServerCommand{AllowedHosts: tt.hosts}
+			assert.Equal(t, tt.want, s.getAllowedRedirectHosts())
+		})
+	}
+}
+
 func chooseRandomUnusedPort() (port int) {
-	for i := 0; i < 10; i++ {
+	for range 10 {
 		port = 40000 + int(rand.Int31n(10000))
 		if ln, err := net.Listen("tcp", fmt.Sprintf(":%d", port)); err == nil {
 			_ = ln.Close()
@@ -741,7 +945,7 @@ func waitForHTTPServerStart(port int) {
 	// wait for up to 3 seconds for server to start before returning it
 	client := http.Client{Timeout: time.Second}
 	defer client.CloseIdleConnections()
-	for i := 0; i < 300; i++ {
+	for range 300 {
 		time.Sleep(time.Millisecond * 10)
 		if resp, err := client.Get(fmt.Sprintf("http://localhost:%d", port)); err == nil {
 			_ = resp.Body.Close()
@@ -752,7 +956,7 @@ func waitForHTTPServerStart(port int) {

 func waitForHTTPSServerStart(port int) {
 	// wait for up to 3 seconds for HTTPS server to start
-	for i := 0; i < 300; i++ {
+	for range 300 {
 		time.Sleep(time.Millisecond * 10)
 		conn, _ := net.DialTimeout("tcp", fmt.Sprintf("localhost:%d", port), time.Millisecond*10)
 		if conn != nil {
@@ -771,7 +975,6 @@ func prepServerApp(t *testing.T, fn func(o ServerCommand) ServerCommand) (*serve
 	_, err := p.ParseArgs([]string{"--admin-passwd=password", "--site=remark"})
 	require.NoError(t, err)
 	cmd.Avatar.FS.Path, cmd.Avatar.Type, cmd.BackupLocation, cmd.Image.FS.Path = "/tmp/remark42_test", "fs", "/tmp/remark42_test", "/tmp/remark42_test"
-	cmd.Store.Bolt.Path = fmt.Sprintf("/tmp/%d", cmd.Port)
 	cmd.Store.Bolt.Timeout = 10 * time.Second
 	cmd.Auth.Apple.CID, cmd.Auth.Apple.KID, cmd.Auth.Apple.TID = "cid", "kid", "tid"
 	cmd.Auth.Apple.PrivateKeyFilePath = "testdata/apple.p8"
@@ -782,6 +985,7 @@ func prepServerApp(t *testing.T, fn func(o ServerCommand) ServerCommand) (*serve
 	cmd.Auth.Microsoft.CSEC, cmd.Auth.Microsoft.CID = "csec", "cid"
 	cmd.Auth.Twitter.CSEC, cmd.Auth.Twitter.CID = "csec", "cid"
 	cmd.Auth.Patreon.CSEC, cmd.Auth.Patreon.CID = "csec", "cid"
+	cmd.Auth.Discord.CSEC, cmd.Auth.Discord.CID = "csec", "cid"
 	cmd.Auth.Telegram = true
 	cmd.Telegram.Token = "token"
 	cmd.Auth.Email.Enable = true
@@ -802,7 +1006,10 @@ func prepServerApp(t *testing.T, fn func(o ServerCommand) ServerCommand) (*serve
 	cmd.RestrictedNames = []string{"umputun", "bobuk"}
 	cmd.emailMsgTemplatePath = "../../templates/email_reply.html.tmpl"
 	cmd.emailVerificationTemplatePath = "../../templates/email_confirmation_subscription.html.tmpl"
+
 	cmd = fn(cmd)
+	// as is uses port, call it after fn which could set it
+	cmd.Store.Bolt.Path = fmt.Sprintf("/tmp/%d", cmd.Port)

 	app, ctx, cancel := createAppFromCmd(t, cmd)

@@ -826,5 +1033,10 @@ func createAppFromCmd(t *testing.T, cmd ServerCommand) (*serverApp, context.Cont

 func TestMain(m *testing.M) {
 	// ignore is added only for GitHub Actions, can't reproduce locally
-	goleak.VerifyTestMain(m, goleak.IgnoreTopFunction("net/http.(*Server).Shutdown"))
+	goleak.VerifyTestMain(
+		m,
+		goleak.IgnoreTopFunction("net/http.(*Server).Shutdown"),
+		// this will be fixed in https://github.com/hashicorp/golang-lru/issues/159
+		goleak.IgnoreTopFunction("github.com/hashicorp/golang-lru/v2/expirable.NewLRU[...].func1"),
+	)
 }
@@ -1,6 +1,7 @@
 package main

 import (
+	"errors"
 	"fmt"
 	"os"
 	"os/signal"
@@ -55,7 +56,8 @@ func main() {
 	}

 	if _, err := p.Parse(); err != nil {
-		if flagsErr, ok := err.(*flags.Error); ok && flagsErr.Type == flags.ErrHelp {
+		var flagsErr *flags.Error
+		if errors.As(err, &flagsErr) && flagsErr.Type == flags.ErrHelp {
 			os.Exit(0)
 		}
 		os.Exit(1)
@@ -90,14 +92,11 @@ func logDeprecatedParams(params []cmd.DeprecatedFlag) {
 func getDump() string {
 	maxSize := 5 * 1024 * 1024
 	stacktrace := make([]byte, maxSize)
-	length := runtime.Stack(stacktrace, true)
-	if length > maxSize {
-		length = maxSize
-	}
+	length := min(runtime.Stack(stacktrace, true), maxSize)
 	return string(stacktrace[:length])
 }

-// nolint:gochecknoinits // can't avoid it in this place
+//nolint:gochecknoinits // can't avoid it in this place
 func init() {
 	// catch SIGQUIT and print stack traces
 	sigChan := make(chan os.Signal, 1)
@@ -64,7 +64,7 @@ func TestMain_WithWebhook(t *testing.T) {
 	defer os.RemoveAll(dir)

 	var webhookSent int32
-	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	ts := httptest.NewServer(http.HandlerFunc(func(_ http.ResponseWriter, r *http.Request) {
 		atomic.StoreInt32(&webhookSent, 1)
 		assert.Equal(t, "application/json", r.Header.Get("Content-Type"))

@@ -98,9 +98,6 @@ func TestMain_WithWebhook(t *testing.T) {
 	finished := make(chan struct{})
 	go func() {
 		main()
-		assert.Eventually(t, func() bool {
-			return atomic.LoadInt32(&webhookSent) == int32(1)
-		}, time.Second, 100*time.Millisecond, "webhook was not sent")
 		close(finished)
 	}()

@@ -117,18 +114,23 @@ func TestMain_WithWebhook(t *testing.T) {
 	require.NoError(t, err)
 	defer resp.Body.Close()
 	assert.Equal(t, http.StatusCreated, resp.StatusCode)
+
+	// wait for webhook to be sent before shutting down
+	assert.Eventually(t, func() bool {
+		return atomic.LoadInt32(&webhookSent) == int32(1)
+	}, time.Second, 100*time.Millisecond, "webhook was not sent")
 }

 func TestGetDump(t *testing.T) {
 	dump := getDump()
-	assert.True(t, strings.Contains(dump, "goroutine"))
-	assert.True(t, strings.Contains(dump, "[running]"))
-	assert.True(t, strings.Contains(dump, "backend/app/main.go"))
+	assert.Contains(t, dump, "goroutine")
+	assert.Contains(t, dump, "[running]")
+	assert.Contains(t, dump, "backend/app/main.go")
 	t.Logf("\n dump: %s", dump)
 }

 func chooseRandomUnusedPort() (port int) {
-	for i := 0; i < 10; i++ {
+	for range 10 {
 		port = 40000 + int(rand.Int31n(10000))
 		if ln, err := net.Listen("tcp", fmt.Sprintf(":%d", port)); err == nil {
 			_ = ln.Close()
@@ -142,7 +144,7 @@ func waitForHTTPServerStart(port int) {
 	// wait for up to 10 seconds for server to start before returning it
 	client := http.Client{Timeout: time.Second}
 	defer client.CloseIdleConnections()
-	for i := 0; i < 100; i++ {
+	for range 100 {
 		time.Sleep(time.Millisecond * 100)
 		if resp, err := client.Get(fmt.Sprintf("http://localhost:%d", port)); err == nil {
 			_ = resp.Body.Close()
@@ -157,5 +159,7 @@ func TestMain(m *testing.M) {
 		m,
 		goleak.IgnoreTopFunction("github.com/umputun/remark42/backend/app.init.0.func1"),
 		goleak.IgnoreTopFunction("net/http.(*Server).Shutdown"),
+		// this will be fixed in https://github.com/hashicorp/golang-lru/issues/159
+		goleak.IgnoreTopFunction("github.com/hashicorp/golang-lru/v2/expirable.NewLRU[...].func1"),
 	)
 }
@@ -6,6 +6,7 @@ import (
 	"io"
 	"os"
 	"testing"
+	"testing/synctest"
 	"time"

 	"github.com/stretchr/testify/assert"
@@ -59,19 +60,21 @@ func TestBackup_Do(t *testing.T) {
 	defer os.RemoveAll(loc)
 	assert.NoError(t, os.MkdirAll(loc, 0o700))

-	ctx, cancel := context.WithCancel(context.Background())
-	go func() {
-		time.Sleep(time.Second)
-		cancel()
-	}()
+	synctest.Test(t, func(t *testing.T) {
+		ctx, cancel := context.WithCancel(context.Background())
+		go func() {
+			time.Sleep(time.Second)
+			cancel()
+		}()

-	bk := AutoBackup{BackupLocation: loc, SiteID: "site1", KeepMax: 3, Exporter: &mockExporter{}, Duration: 600 * time.Millisecond}
-	bk.Do(ctx)
+		bk := AutoBackup{BackupLocation: loc, SiteID: "site1", KeepMax: 3, Exporter: &mockExporter{}, Duration: 600 * time.Millisecond}
+		bk.Do(ctx)

-	expFile := fmt.Sprintf("/tmp/remark-backups.test/backup-site1-%s.gz", time.Now().Format("20060102"))
-	fi, err := os.Lstat(expFile)
-	assert.NoError(t, err)
-	assert.Equal(t, int64(52), fi.Size())
+		expFile := fmt.Sprintf("/tmp/remark-backups.test/backup-site1-%s.gz", time.Now().Format("20060102"))
+		fi, err := os.Lstat(expFile)
+		assert.NoError(t, err)
+		assert.Equal(t, int64(52), fi.Size())
+	})
 }

 type mockExporter struct{}
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"net/url"
 	"time"

 	"github.com/umputun/remark42/backend/app/store"
@@ -47,7 +48,7 @@ type commentoCommenter struct {
 	Link         string    `json:"link"`
 	Photo        string    `json:"photo"`
 	Provider     string    `json:"provider,omitempty"`
-	JoinDate     time.Time `json:"joinDate,omitempty"`
+	JoinDate     time.Time `json:"joinDate"`
 	IsModerator  bool      `json:"isModerator"`
 }

@@ -100,6 +101,11 @@ func (d *Commento) convert(r io.Reader, siteID string) (ch chan store.Comment) {
 			}
 		}

+		usersMap["anonymous"] = store.User{
+			Name: "Anonymous",
+			ID:   "commento_" + store.EncodeID("anonymous"),
+		}
+
 		for _, comment := range exportedData.Comments {
 			u, ok := usersMap[comment.CommenterHex]
 			if !ok {
@@ -110,16 +116,28 @@ func (d *Commento) convert(r io.Reader, siteID string) (ch chan store.Comment) {
 				continue
 			}

+			parentID := comment.ParentHex
+			// comments with ParentHex == "root" are top-level comments
+			if parentID == "root" {
+				parentID = ""
+			}
+
+			commentURL, e := url.JoinPath("https://", comment.Domain, comment.Path)
+			if e != nil {
+				log.Printf("[WARN] can't construct comment URL in commento import, %s", err.Error())
+			}
+			log.Printf("[ERROR] commentoURL: %s", commentURL)
+
 			c := store.Comment{
 				ID: comment.CommentHex,
 				Locator: store.Locator{
-					URL:    comment.Path,
+					URL:    commentURL,
 					SiteID: siteID,
 				},
 				User:      u,
 				Text:      comment.Markdown,
 				Timestamp: comment.CreationDate,
-				ParentID:  comment.ParentHex,
+				ParentID:  parentID,
 				Imported:  true,
 			}

@@ -27,11 +27,11 @@ func TestCommento_Import(t *testing.T) {
 	require.NoError(t, err)
 	size, err := d.Import(fh, "test")
 	assert.NoError(t, err)
-	assert.Equal(t, 2, size)
+	assert.Equal(t, 3, size)

 	last, err := dataStore.Last("test", 10, time.Time{}, adminUser)
 	assert.NoError(t, err)
-	require.Equal(t, 2, len(last), "2 comments imported")
+	require.Equal(t, 3, len(last), "3 comments imported")

 	t.Log(last[0])

@@ -44,11 +44,24 @@ func TestCommento_Import(t *testing.T) {
 	assert.Equal(t, "commento_35369aeb6ac5255de30410a0f86dc71eb9c6d0ca", c.User.ID)
 	assert.True(t, c.Imported)

+	c = last[2] // anonymous comment
+	assert.Equal(t, "Example comment created by user.", c.Text)
+	assert.Equal(t, "e7069a7dfcfaed43caf62300a9b0edb1c124ad79d0f5887c93649c15d7f69945", c.ID)
+	assert.Equal(t, "", c.ParentID)
+	assert.Equal(t, store.Locator{SiteID: "test", URL: "https://example.com/blog/post/2"}, c.Locator)
+	assert.Equal(t, "Anonymous", c.User.Name)
+	assert.Equal(t, "commento_0a92fab3230134cca6eadd9898325b9b2ae67998", c.User.ID)
+	assert.True(t, c.Imported)
+
 	posts, err := dataStore.List("test", 0, 0)
 	assert.NoError(t, err)
-	assert.Equal(t, 1, len(posts), "1 post")
+	assert.Equal(t, 2, len(posts), "2 posts")

 	count, err := dataStore.Count(store.Locator{SiteID: "test", URL: "https://example.com/blog/post/1"})
 	assert.NoError(t, err)
 	assert.Equal(t, 2, count)
+
+	count, err = dataStore.Count(store.Locator{SiteID: "test", URL: "https://example.com/blog/post/2"})
+	assert.NoError(t, err)
+	assert.Equal(t, 1, count)
 }
@@ -175,7 +175,7 @@ func (d *Disqus) convert(r io.Reader, siteID string) (ch chan store.Comment) {

 func (*Disqus) cleanText(text string) string {
 	text = strings.TrimSpace(text)
-	text = strings.Replace(text, "\n", "", -1)
-	text = strings.Replace(text, "\t", "", -1)
+	text = strings.ReplaceAll(text, "\n", "")
+	text = strings.ReplaceAll(text, "\t", "")
 	return text
 }
@@ -122,7 +122,7 @@ func TestDisqus_Convert(t *testing.T) {
 	require.NoError(t, err)
 	ch := d.convert(fh, "test")

-	res := []store.Comment{}
+	res := make([]store.Comment, 0, 4)
 	for comment := range ch {
 		res = append(res, comment)
 	}
@@ -38,7 +38,7 @@ func (u *URLMapper) loadRules(reader io.Reader) error {

 	u.rules = make(map[string]string)

-	for _, row := range strings.Split(rulesText, "\n") {
+	for row := range strings.SplitSeq(rulesText, "\n") {
 		row = strings.TrimSpace(row)
 		urls := strings.Split(row, " ")
 		if len(urls) != 2 {
@@ -64,8 +64,8 @@ func (u *URLMapper) URL(url string) string {
 		}
 		oldURL = strings.TrimSuffix(oldURL, "*")
 		newURL = strings.TrimSuffix(newURL, "*")
-		if strings.HasPrefix(url, oldURL) {
-			return newURL + strings.TrimPrefix(url, oldURL)
+		if after, ok := strings.CutPrefix(url, oldURL); ok {
+			return newURL + after
 		}
 	}
 	// search failed, return given url
@@ -77,11 +77,11 @@ func TestMigrator_ImportCommento(t *testing.T) {
 		Provider:  "commento",
 	})
 	assert.NoError(t, err)
-	assert.Equal(t, 2, size)
+	assert.Equal(t, 3, size)

 	last, err := dataStore.Last("test", 10, time.Time{}, store.User{})
 	assert.NoError(t, err)
-	assert.Equal(t, 2, len(last), "2 comments imported")
+	assert.Equal(t, 3, len(last), "3 comments imported")
 }

 func TestMigrator_ImportNative(t *testing.T) {
@@ -162,7 +162,7 @@ func TestNative_ImportManyWithError(t *testing.T) {

 	buf := &bytes.Buffer{}
 	buf.WriteString(`{"version":1, "users":[], "posts":[]}` + "\n")
-	for i := 0; i < 100; i++ {
+	for i := range 100 {
 		fmt.Fprintf(buf, goodRec, i)
 	}
 	buf.WriteString("{}\n")
@@ -4,7 +4,7 @@
 	{
 	  "commentHex": "e7069a7dfcfaed43caf62300a9b0edb1c124ad79d0f5887c93649c15d7f69945",
 	  "domain": "example.com",
-	  "url": "https://example.com/blog/post/1",
+	  "url": "/blog/post/2",
 	  "commenterHex": "anonymous",
 	  "markdown": "Example comment created by user.",
 	  "html": "",
@@ -18,7 +18,7 @@
 	{
 	  "commentHex": "7d77e39fcd813241d6281478cc8f21ab5f807d043c750bc1a936bc23b34fb854",
 	  "domain": "example.com",
-	  "url": "https://example.com/blog/post/1",
+	  "url": "/blog/post/1",
 	  "commenterHex": "a1ac58ed1146bd7fe3feff6a7276f73955c3bfd23cacee00e2e0a7a89b1a8c10",
 	  "markdown": "Example 2 comment created by user.",
 	  "html": "",
@@ -32,7 +32,7 @@
 	{
 	  "commentHex": "ea5f7bcd6ac9bb7b657f7d0569831104e1bcf9c253d03c1e16bf9654c49a5ce9",
 	  "domain": "example.com",
-	  "url": "https://example.com/blog/post/1",
+	  "url": "/blog/post/1",
 	  "commenterHex": "bd1290ab5c858cf2a05903c2a9a61fd63399c6635db38cc6597002195e22e061",
 	  "markdown": "Great reply!",
 	  "html": "",
@@ -16,7 +16,8 @@ const wpTimeLayout = "2006-01-02 15:04:05"

 // WordPress implements Importer from WP xml
 type WordPress struct {
-	DataStore Store
+	DataStore                  Store
+	DisableFancyTextFormatting bool
 }

 type wpItem struct {
@@ -138,7 +139,7 @@ func (w *WordPress) convert(r io.Reader, siteID string) chan store.Comment {
 								ParentID:  comment.PID,
 								Imported:  true,
 							}
-							commentsCh <- commentFormatter.Format(c)
+							commentsCh <- commentFormatter.Format(c, w.DisableFancyTextFormatting)
 							stats.inpComments++
 							if stats.inpComments%1000 == 0 {
 								log.Printf("[DEBUG] processed %d comments", stats.inpComments)
@@ -24,7 +24,7 @@ func TestWordPress_Import(t *testing.T) {

 	dataStore := service.DataStore{Engine: b, AdminStore: admin.NewStaticStore("12345", nil, []string{}, "")}
 	defer dataStore.Close()
-	wp := WordPress{DataStore: &dataStore}
+	wp := WordPress{DataStore: &dataStore, DisableFancyTextFormatting: false}
 	size, err := wp.Import(strings.NewReader(xmlTestWP), siteID)
 	assert.NoError(t, err)
 	assert.Equal(t, 3, size)
@@ -41,7 +41,7 @@ func TestWordPress_Import(t *testing.T) {
 	assert.Equal(t, "e8b1e92bbcf5b9bb88472f9bdb82d1b8c7ed39d6", c.User.IP)
 	ts, _ := time.Parse(wpTimeLayout, "2010-08-18 15:19:14")
 	assert.Equal(t, ts, c.Timestamp)
-	assert.Equal(t, c.Text, "<p>Mekkatorque was over in that tent up to the right</p>\n")
+	assert.Equal(t, "<p>«Mekkatorque» was over in that tent up to the right</p>\n", c.Text)
 	assert.True(t, c.Imported)

 	posts, err := dataStore.List(siteID, 0, 0)
@@ -54,13 +54,25 @@ func TestWordPress_Import(t *testing.T) {
 	count, err := dataStore.Count(store.Locator{URL: "https://realmenweardress.es/2010/07/do-you-rp/", SiteID: siteID})
 	assert.NoError(t, err)
 	assert.Equal(t, 3, count)
+
+	// test with DisableFancyTextFormatting
+	wp = WordPress{DataStore: &dataStore, DisableFancyTextFormatting: true}
+	size, err = wp.Import(strings.NewReader(xmlTestWP), siteID)
+	assert.NoError(t, err)
+	assert.Equal(t, 3, size)
+
+	last, err = dataStore.Last(siteID, 10, time.Time{}, adminUser)
+	assert.NoError(t, err)
+	require.Equal(t, 3, len(last), "3 comments imported")
+
+	assert.Equal(t, "<p>&#34;Mekkatorque&#34; was over in that tent up to the right</p>\n", last[0].Text)
 }

 func TestWordPress_Convert(t *testing.T) {
 	wp := WordPress{}
 	ch := wp.convert(strings.NewReader(xmlTestWP), "testWP")

-	comments := []store.Comment{}
+	comments := make([]store.Comment, 0, 3)
 	for c := range ch {
 		comments = append(comments, c)
 	}
@@ -88,7 +100,7 @@ func TestWP_Convert_MD(t *testing.T) {
 	wp := WordPress{}
 	ch := wp.convert(strings.NewReader(xmlTestWPmd), "siteID")

-	comments := []store.Comment{}
+	comments := make([]store.Comment, 0, 3)
 	for c := range ch {
 		comments = append(comments, c)
 	}
@@ -247,7 +259,7 @@ var xmlTestWP = `
 			<wp:comment_author_IP><![CDATA[128.243.253.117]]></wp:comment_author_IP>
 			<wp:comment_date><![CDATA[2010-08-18 15:19:14]]></wp:comment_date>
 			<wp:comment_date_gmt><![CDATA[2010-08-18 15:19:14]]></wp:comment_date_gmt>
-			<wp:comment_content><![CDATA[Mekkatorque was over in that tent up to the right]]></wp:comment_content>
+			<wp:comment_content><![CDATA["Mekkatorque" was over in that tent up to the right]]></wp:comment_content>
 			<wp:comment_approved><![CDATA[1]]></wp:comment_approved>
 			<wp:comment_type><![CDATA[]]></wp:comment_type>
 			<wp:comment_parent>13</wp:comment_parent>
@@ -10,7 +10,7 @@ import (

 	log "github.com/go-pkgz/lgr"
 	ntf "github.com/go-pkgz/notify"
-	"github.com/go-pkgz/repeater"
+	"github.com/go-pkgz/repeater/v2"
 	"github.com/hashicorp/go-multierror"

 	"github.com/umputun/remark42/backend/app/templates"
@@ -26,7 +26,7 @@ type EmailParams struct {
 	SubscribeURL             string   // full subscribe handler URL
 	UnsubscribeURL           string   // full unsubscribe handler URL

-	TokenGenFn func(userID, email, site string) (string, error) // Unsubscribe token generation function
+	TokenGenFn func(userID, email, site string) (string, error) // unsubscribe token generation function
 }

 // Email implements notify.Destination for email
@@ -161,14 +161,14 @@ func (e *Email) buildAndSendMessage(ctx context.Context, req Request, email stri
 		return err
 	}

-	return repeater.NewDefault(5, time.Millisecond*250).Do(
+	return repeater.NewFixed(5, time.Millisecond*250).Do(
 		ctx,
 		func() error {
 			return e.Email.Send(
 				ctx,
 				fmt.Sprintf("mailto:%s?from=%s&unsubscribeLink=%s&subject=%s",
 					email,
-					e.From,
+					url.QueryEscape(e.From),
 					url.QueryEscape(msg.unsubscribeLink),
 					url.QueryEscape(msg.subject),
 				),
@@ -196,14 +196,14 @@ func (e *Email) SendVerification(ctx context.Context, req VerificationRequest) e
 		return err
 	}

-	return repeater.NewDefault(5, time.Millisecond*250).Do(
+	return repeater.NewFixed(5, time.Millisecond*250).Do(
 		ctx,
 		func() error {
 			return e.Email.Send(
 				ctx,
 				fmt.Sprintf("mailto:%s?from=%s&subject=%s",
 					req.Email,
-					e.From,
+					url.QueryEscape(e.From),
 					url.QueryEscape(e.VerificationSubject),
 				),
 				msg,
@@ -34,7 +34,7 @@ func TestEmailNew(t *testing.T) {
 	assert.NotNil(t, email, "email returned")

 	assert.NotNil(t, email.msgTmpl, "e.template is set")
-	assert.Equal(t, emailParams.From, email.EmailParams.From, "emailParams.From unchanged after creation")
+	assert.Equal(t, emailParams.From, email.From, "emailParams.From unchanged after creation")
 	if smtpParams.TimeOut == 0 {
 		assert.Equal(t, defaultEmailTimeout, email.TimeOut, "empty emailParams.TimeOut changed to default")
 	} else {
@@ -88,7 +88,6 @@ func Test_initTemplatesErr(t *testing.T) {
 	}

 	for _, d := range testSet {
-		d := d
 		t.Run(d.name, func(t *testing.T) {
 			e, err := NewEmail(d.emailParams, ntf.SMTPParams{})
 			require.Error(t, err)
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"sync"
-	"time"

 	log "github.com/go-pkgz/lgr"
 )
@@ -22,14 +21,13 @@ type MockDest struct {
 func (m *MockDest) Send(ctx context.Context, r Request) error {
 	m.lock.Lock()
 	defer m.lock.Unlock()
-	select {
-	case <-time.After(10 * time.Millisecond):
-		m.data = append(m.data, r)
-		log.Printf("sent %s -> %d", r.Comment.ID, m.id)
-	case <-ctx.Done():
+	if err := ctx.Err(); err != nil {
 		log.Printf("ctx closed %d", m.id)
 		m.closed = true
+		return nil
 	}
+	m.data = append(m.data, r)
+	log.Printf("sent %s -> %d", r.Comment.ID, m.id)
 	return nil
 }

@@ -37,14 +35,13 @@ func (m *MockDest) Send(ctx context.Context, r Request) error {
 func (m *MockDest) SendVerification(ctx context.Context, v VerificationRequest) error {
 	m.lock.Lock()
 	defer m.lock.Unlock()
-	select {
-	case <-time.After(10 * time.Millisecond):
-		m.verificationData = append(m.verificationData, v)
-		log.Printf("sent verification %s -> %d", v.User, m.id)
-	case <-ctx.Done():
+	if err := ctx.Err(); err != nil {
 		log.Printf("verification ctx closed %d", m.id)
 		m.closed = true
+		return nil
 	}
+	m.verificationData = append(m.verificationData, v)
+	log.Printf("sent verification %s -> %d", v.User, m.id)
 	return nil
 }

@@ -66,4 +63,15 @@ func (m *MockDest) GetVerify() []VerificationRequest {
 	return res
 }

-func (m *MockDest) String() string { return fmt.Sprintf("mock id=%d, closed=%v", m.id, m.closed) }
+// IsClosed returns closed status safely
+func (m *MockDest) IsClosed() bool {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	return m.closed
+}
+
+func (m *MockDest) String() string {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	return fmt.Sprintf("mock id=%d, closed=%v", m.id, m.closed)
+}
@@ -2,10 +2,9 @@ package notify

 import (
 	"fmt"
-	"math/rand"
 	"sync/atomic"
 	"testing"
-	"time"
+	"testing/synctest"

 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -26,248 +25,256 @@ func TestService_NoDestinations(t *testing.T) {
 }

 func TestService_WithDestinations(t *testing.T) {
-	d1, d2 := &MockDest{id: 1}, &MockDest{id: 2}
-	s := NewService(nil, 1, d1, d2)
-	assert.NotNil(t, s)
+	synctest.Test(t, func(t *testing.T) {
+		d1, d2 := &MockDest{id: 1}, &MockDest{id: 2}
+		s := NewService(nil, 1, d1, d2)
+		assert.NotNil(t, s)

-	s.Submit(Request{Comment: store.Comment{ID: "100"}})
-	time.Sleep(time.Millisecond * 110)
-	s.Submit(Request{Comment: store.Comment{ID: "101"}})
-	time.Sleep(time.Millisecond * 110)
-	s.Submit(Request{Comment: store.Comment{ID: "102"}})
-	time.Sleep(time.Millisecond * 110)
-	s.Close()
+		s.Submit(Request{Comment: store.Comment{ID: "100"}})
+		synctest.Wait()
+		s.Submit(Request{Comment: store.Comment{ID: "101"}})
+		synctest.Wait()
+		s.Submit(Request{Comment: store.Comment{ID: "102"}})
+		synctest.Wait()
+		s.Close()

-	require.Equal(t, 3, len(d1.Get()), "got all comments to d1")
-	require.Equal(t, 3, len(d2.Get()), "got all comments to d2")
+		require.Equal(t, 3, len(d1.Get()), "got all comments to d1")
+		require.Equal(t, 3, len(d2.Get()), "got all comments to d2")

-	assert.Equal(t, "100", d1.Get()[0].Comment.ID)
-	assert.Equal(t, "101", d1.Get()[1].Comment.ID)
-	assert.Equal(t, "102", d1.Get()[2].Comment.ID)
+		assert.Equal(t, "100", d1.Get()[0].Comment.ID)
+		assert.Equal(t, "101", d1.Get()[1].Comment.ID)
+		assert.Equal(t, "102", d1.Get()[2].Comment.ID)
+	})
 }

 func TestService_WithDrops(t *testing.T) {
-	d1, d2 := &MockDest{id: 1}, &MockDest{id: 2}
-	s := NewService(nil, 1, d1, d2)
-	assert.NotNil(t, s)
+	synctest.Test(t, func(t *testing.T) {
+		d1, d2 := &MockDest{id: 1}, &MockDest{id: 2}
+		s := NewService(nil, 1, d1, d2)
+		assert.NotNil(t, s)

-	s.Submit(Request{Comment: store.Comment{ID: "100"}})
-	s.Submit(Request{Comment: store.Comment{ID: "101"}})
-	s.Submit(Request{Comment: store.Comment{ID: "102"}})
-	time.Sleep(time.Millisecond * 21)
-	s.Close()
+		s.Submit(Request{Comment: store.Comment{ID: "100"}})
+		s.Submit(Request{Comment: store.Comment{ID: "101"}})
+		s.Submit(Request{Comment: store.Comment{ID: "102"}})
+		synctest.Wait()
+		s.Close()

-	s.Submit(Request{Comment: store.Comment{ID: "111"}}) // safe to send after close
+		s.Submit(Request{Comment: store.Comment{ID: "111"}}) // safe to send after close

-	assert.LessOrEqual(t, len(d1.Get()), 2, "at least one comment from three dropped from d1, got: %v", d1.Get())
-	assert.LessOrEqual(t, len(d2.Get()), 2, "at least one comment from three dropped from d2, got: %v", d2.Get())
+		assert.LessOrEqual(t, len(d1.Get()), 2, "at least one comment from three dropped from d1, got: %v", d1.Get())
+		assert.LessOrEqual(t, len(d2.Get()), 2, "at least one comment from three dropped from d2, got: %v", d2.Get())
+	})
 }

 func TestService_SubmitVerificationWithDrops(t *testing.T) {
-	d1, d2 := &MockDest{id: 1}, &MockDest{id: 2}
-	s := NewService(nil, 1, d1, d2)
-	assert.NotNil(t, s)
+	synctest.Test(t, func(t *testing.T) {
+		d1, d2 := &MockDest{id: 1}, &MockDest{id: 2}
+		s := NewService(nil, 1, d1, d2)
+		assert.NotNil(t, s)

-	s.SubmitVerification(VerificationRequest{
-		SiteID: "remark",
-		User:   "testUser",
-		Email:  "test@example.org",
-		Token:  "testToken",
+		s.SubmitVerification(VerificationRequest{
+			SiteID: "remark",
+			User:   "testUser",
+			Email:  "test@example.org",
+			Token:  "testToken",
+		})
+		s.SubmitVerification(VerificationRequest{})
+		s.SubmitVerification(VerificationRequest{})
+		synctest.Wait()
+		s.Close()
+
+		s.SubmitVerification(VerificationRequest{}) // safe to send after close
+
+		assert.LessOrEqual(t, len(d2.GetVerify()), 2, "one request from three dropped from d2, got: %v", d2.GetVerify())
+
+		verifyDest := d1.GetVerify()
+		require.LessOrEqual(t, len(verifyDest), 2, "one request from three dropped from d1, got: %v", verifyDest)
+		assert.Equal(t, "remark", verifyDest[0].SiteID)
+		assert.Equal(t, "testUser", verifyDest[0].User)
+		assert.Equal(t, "test@example.org", verifyDest[0].Email)
+		assert.Equal(t, "testToken", verifyDest[0].Token)
 	})
-	s.SubmitVerification(VerificationRequest{})
-	s.SubmitVerification(VerificationRequest{})
-	time.Sleep(time.Millisecond * 21)
-	s.Close()
-
-	s.SubmitVerification(VerificationRequest{}) // safe to send after close
-
-	assert.LessOrEqual(t, len(d2.GetVerify()), 2, "one request from three dropped from d2, got: %v", d2.GetVerify())
-
-	verifyDest := d1.GetVerify()
-	require.LessOrEqual(t, len(verifyDest), 2, "one request from three dropped from d1, got: %v", verifyDest)
-	assert.Equal(t, "remark", verifyDest[0].SiteID)
-	assert.Equal(t, "testUser", verifyDest[0].User)
-	assert.Equal(t, "test@example.org", verifyDest[0].Email)
-	assert.Equal(t, "testToken", verifyDest[0].Token)
 }

 func TestService_Many(t *testing.T) {
-	d1, d2 := &MockDest{id: 1}, &MockDest{id: 2}
-	s := NewService(nil, 5, d1, d2)
-	assert.NotNil(t, s)
+	synctest.Test(t, func(t *testing.T) {
+		d1, d2 := &MockDest{id: 1}, &MockDest{id: 2}
+		s := NewService(nil, 5, d1, d2)
+		assert.NotNil(t, s)

-	for i := 0; i < 10; i++ {
-		s.Submit(Request{Comment: store.Comment{ID: fmt.Sprintf("%d", 100+i)}})
-		s.SubmitVerification(VerificationRequest{User: fmt.Sprintf("%d", 100+i)})
-		time.Sleep(time.Millisecond * time.Duration(rand.Int31n(20)))
-	}
-	s.Close()
-	time.Sleep(time.Millisecond * 10)
+		for i := range 10 {
+			s.Submit(Request{Comment: store.Comment{ID: fmt.Sprintf("%d", 100+i)}})
+			s.SubmitVerification(VerificationRequest{User: fmt.Sprintf("%d", 100+i)})
+		}
+		s.Close()

-	assert.NotEqual(t, 10, len(d1.Get()), "some comments dropped from d1")
-	assert.NotEqual(t, 10, len(d1.GetVerify()), "some verifications dropped from d1")
-	assert.NotEqual(t, 10, len(d2.Get()), "some comments dropped from d2")
-	assert.NotEqual(t, 10, len(d2.GetVerify()), "some verifications dropped from d2")
-
-	assert.True(t, d1.closed)
-	assert.True(t, d2.closed)
-	assert.Equal(t, "mock id=1, closed=true", d1.String())
+		assert.NotEqual(t, 10, len(d1.Get()), "some comments dropped from d1")
+		assert.NotEqual(t, 10, len(d1.GetVerify()), "some verifications dropped from d1")
+		assert.NotEqual(t, 10, len(d2.Get()), "some comments dropped from d2")
+		assert.NotEqual(t, 10, len(d2.GetVerify()), "some verifications dropped from d2")
+	})
 }

 func TestService_WithParent(t *testing.T) {
-	dest := &MockDest{id: 1}
-	dataStore := &mockStore{data: map[string]store.Comment{}}
+	synctest.Test(t, func(t *testing.T) {
+		dest := &MockDest{id: 1}
+		dataStore := &mockStore{data: map[string]store.Comment{}}

-	dataStore.data["p1"] = store.Comment{ID: "p1"}
-	dataStore.data["p2"] = store.Comment{ID: "p2"}
+		dataStore.data["p1"] = store.Comment{ID: "p1"}
+		dataStore.data["p2"] = store.Comment{ID: "p2"}

-	s := NewService(dataStore, 1, dest)
-	assert.NotNil(t, s)
+		s := NewService(dataStore, 1, dest)
+		assert.NotNil(t, s)

-	s.Submit(Request{Comment: store.Comment{ID: "c1", ParentID: "p1"}})
-	time.Sleep(time.Millisecond * 110)
-	s.Submit(Request{Comment: store.Comment{ID: "c11", ParentID: "p11"}})
-	time.Sleep(time.Millisecond * 110)
-	s.Close()
+		s.Submit(Request{Comment: store.Comment{ID: "c1", ParentID: "p1"}})
+		synctest.Wait()
+		s.Submit(Request{Comment: store.Comment{ID: "c11", ParentID: "p11"}})
+		synctest.Wait()
+		s.Close()

-	destRes := dest.Get()
-	require.Equal(t, 2, len(destRes), "two comment notified")
-	assert.Equal(t, "p1", destRes[0].Comment.ParentID)
-	assert.Equal(t, "p1", destRes[0].parent.ID)
-	assert.Equal(t, "p11", destRes[1].Comment.ParentID)
-	assert.Equal(t, "", destRes[1].parent.ID)
+		destRes := dest.Get()
+		require.Equal(t, 2, len(destRes), "two comment notified")
+		assert.Equal(t, "p1", destRes[0].Comment.ParentID)
+		assert.Equal(t, "p1", destRes[0].parent.ID)
+		assert.Equal(t, "p11", destRes[1].Comment.ParentID)
+		assert.Equal(t, "", destRes[1].parent.ID)
+	})
 }

 func TestService_EmailRetrieval(t *testing.T) {
-	dest := &MockDest{id: 1}
-	dataStore := &mockStore{data: map[string]store.Comment{}, userDetails: map[string]string{}}
+	synctest.Test(t, func(t *testing.T) {
+		dest := &MockDest{id: 1}
+		dataStore := &mockStore{data: map[string]store.Comment{}, userDetails: map[string]string{}}

-	dataStore.data["p1"] = store.Comment{ID: "p1", User: store.User{ID: "u1"}}
-	dataStore.data["p2"] = store.Comment{ID: "p2", ParentID: "p1", User: store.User{ID: "u1"}}
-	dataStore.data["p3"] = store.Comment{ID: "p3", ParentID: "p1", User: store.User{ID: "u2"}}
-	dataStore.data["p4"] = store.Comment{ID: "p4", ParentID: "p3", User: store.User{ID: "u1"}}
-	dataStore.userDetails["u1"] = "u1@example.com"
+		dataStore.data["p1"] = store.Comment{ID: "p1", User: store.User{ID: "u1"}}
+		dataStore.data["p2"] = store.Comment{ID: "p2", ParentID: "p1", User: store.User{ID: "u1"}}
+		dataStore.data["p3"] = store.Comment{ID: "p3", ParentID: "p1", User: store.User{ID: "u2"}}
+		dataStore.data["p4"] = store.Comment{ID: "p4", ParentID: "p3", User: store.User{ID: "u1"}}
+		dataStore.userDetails["u1"] = "u1@example.com"

-	s := NewService(dataStore, 1, dest)
-	assert.NotNil(t, s)
+		s := NewService(dataStore, 1, dest)
+		assert.NotNil(t, s)

-	// one comment, one notification
-	s.Submit(Request{Comment: dataStore.data["p1"]})
-	time.Sleep(time.Millisecond * 110)
+		// one comment, one notification
+		s.Submit(Request{Comment: dataStore.data["p1"]})
+		synctest.Wait()

-	destRes := dest.Get()
-	require.Equal(t, 1, len(destRes), "one comment notified")
-	assert.Equal(t, "p1", destRes[0].Comment.ID)
-	assert.Empty(t, destRes[0].parent)
-	assert.Empty(t, destRes[0].Emails)
+		destRes := dest.Get()
+		require.Equal(t, 1, len(destRes), "one comment notified")
+		assert.Equal(t, "p1", destRes[0].Comment.ID)
+		assert.Empty(t, destRes[0].parent)
+		assert.Empty(t, destRes[0].Emails)

-	// reply to the first comment, same comment as one in original comment
-	s.Submit(Request{Comment: dataStore.data["p2"]})
-	time.Sleep(time.Millisecond * 110)
+		// reply to the first comment, same comment as one in original comment
+		s.Submit(Request{Comment: dataStore.data["p2"]})
+		synctest.Wait()

-	destRes = dest.Get()
-	require.Equal(t, 2, len(destRes), "two comment notified")
-	assert.Equal(t, "p2", destRes[1].Comment.ID)
-	assert.Equal(t, "p1", destRes[1].parent.ID)
-	assert.Equal(t, "u1", destRes[1].parent.User.ID)
-	assert.Empty(t, destRes[1].Emails, "u1 is not notified they are the one who left the comment")
+		destRes = dest.Get()
+		require.Equal(t, 2, len(destRes), "two comment notified")
+		assert.Equal(t, "p2", destRes[1].Comment.ID)
+		assert.Equal(t, "p1", destRes[1].parent.ID)
+		assert.Equal(t, "u1", destRes[1].parent.User.ID)
+		assert.Empty(t, destRes[1].Emails, "u1 is not notified they are the one who left the comment")

-	// another reply to the first comment, another user
-	s.Submit(Request{Comment: dataStore.data["p3"]})
-	time.Sleep(time.Millisecond * 110)
+		// another reply to the first comment, another user
+		s.Submit(Request{Comment: dataStore.data["p3"]})
+		synctest.Wait()

-	destRes = dest.Get()
-	require.Equal(t, 3, len(destRes), "three comment notified")
-	assert.Equal(t, "p3", destRes[2].Comment.ID)
-	assert.Equal(t, "p1", destRes[2].parent.ID)
-	assert.Equal(t, "u1", destRes[2].parent.User.ID)
-	assert.ElementsMatch(t, []string{"u1@example.com"}, destRes[2].Emails)
+		destRes = dest.Get()
+		require.Equal(t, 3, len(destRes), "three comment notified")
+		assert.Equal(t, "p3", destRes[2].Comment.ID)
+		assert.Equal(t, "p1", destRes[2].parent.ID)
+		assert.Equal(t, "u1", destRes[2].parent.User.ID)
+		assert.ElementsMatch(t, []string{"u1@example.com"}, destRes[2].Emails)

-	// reply to the last comment by another user, should trigger email retrieval error
-	s.Submit(Request{Comment: dataStore.data["p4"]})
-	time.Sleep(time.Millisecond * 110)
+		// reply to the last comment by another user, should trigger email retrieval error
+		s.Submit(Request{Comment: dataStore.data["p4"]})
+		synctest.Wait()

-	destRes = dest.Get()
-	require.Equal(t, 4, len(destRes), "four comment notified")
-	assert.Equal(t, "p4", destRes[3].Comment.ID)
-	assert.Equal(t, "p3", destRes[3].parent.ID)
-	assert.Equal(t, "u2", destRes[3].parent.User.ID)
-	assert.Empty(t, destRes[3].Emails, "no email can be retrieved for u2")
+		destRes = dest.Get()
+		require.Equal(t, 4, len(destRes), "four comment notified")
+		assert.Equal(t, "p4", destRes[3].Comment.ID)
+		assert.Equal(t, "p3", destRes[3].parent.ID)
+		assert.Equal(t, "u2", destRes[3].parent.User.ID)
+		assert.Empty(t, destRes[3].Emails, "no email can be retrieved for u2")

-	s.Close()
+		s.Close()
+	})
 }

 func TestService_Recursive(t *testing.T) {
-	dest := &MockDest{id: 1}
-	dataStore := &mockStore{data: map[string]store.Comment{}, userDetails: map[string]string{}}
+	synctest.Test(t, func(t *testing.T) {
+		dest := &MockDest{id: 1}
+		dataStore := &mockStore{data: map[string]store.Comment{}, userDetails: map[string]string{}}

-	dataStore.data["p1"] = store.Comment{ID: "p1", User: store.User{ID: "u1"}}
-	dataStore.data["p2"] = store.Comment{ID: "p2", ParentID: "p1", User: store.User{ID: "u2"}}
-	dataStore.data["p3"] = store.Comment{ID: "p3", ParentID: "p2", User: store.User{ID: "u3"}}
-	dataStore.data["p4"] = store.Comment{ID: "p4", ParentID: "p3", User: store.User{ID: "u1"}}
-	dataStore.data["p5"] = store.Comment{ID: "p5", ParentID: "p4", User: store.User{ID: "u4"}}
-	dataStore.userDetails["u1"] = "u1@example.com"
-	// second comment goes without email address for notification
-	dataStore.userDetails["u3"] = "u3@example.com"
+		dataStore.data["p1"] = store.Comment{ID: "p1", User: store.User{ID: "u1"}}
+		dataStore.data["p2"] = store.Comment{ID: "p2", ParentID: "p1", User: store.User{ID: "u2"}}
+		dataStore.data["p3"] = store.Comment{ID: "p3", ParentID: "p2", User: store.User{ID: "u3"}}
+		dataStore.data["p4"] = store.Comment{ID: "p4", ParentID: "p3", User: store.User{ID: "u1"}}
+		dataStore.data["p5"] = store.Comment{ID: "p5", ParentID: "p4", User: store.User{ID: "u4"}}
+		dataStore.userDetails["u1"] = "u1@example.com"
+		// second comment goes without email address for notification
+		dataStore.userDetails["u3"] = "u3@example.com"

-	s := NewService(dataStore, 1, dest)
-	assert.NotNil(t, s)
+		s := NewService(dataStore, 1, dest)
+		assert.NotNil(t, s)

-	// one comment from u1 with email set
-	s.Submit(Request{Comment: dataStore.data["p1"]})
-	time.Sleep(time.Millisecond * 110)
+		// one comment from u1 with email set
+		s.Submit(Request{Comment: dataStore.data["p1"]})
+		synctest.Wait()

-	destRes := dest.Get()
-	require.Equal(t, 1, len(destRes), "one comment notified")
-	assert.Equal(t, "p1", destRes[0].Comment.ID)
-	assert.Empty(t, destRes[0].parent)
-	assert.Empty(t, destRes[0].Emails)
+		destRes := dest.Get()
+		require.Equal(t, 1, len(destRes), "one comment notified")
+		assert.Equal(t, "p1", destRes[0].Comment.ID)
+		assert.Empty(t, destRes[0].parent)
+		assert.Empty(t, destRes[0].Emails)

-	// reply to the first comment from u2 without email set
-	s.Submit(Request{Comment: dataStore.data["p2"]})
-	time.Sleep(time.Millisecond * 110)
+		// reply to the first comment from u2 without email set
+		s.Submit(Request{Comment: dataStore.data["p2"]})
+		synctest.Wait()

-	destRes = dest.Get()
-	require.Equal(t, 2, len(destRes), "two comment notified")
-	assert.Equal(t, "p2", destRes[1].Comment.ID)
-	assert.Equal(t, "p1", destRes[1].parent.ID)
-	assert.Equal(t, "u1", destRes[1].parent.User.ID)
-	assert.ElementsMatch(t, []string{"u1@example.com"}, destRes[1].Emails)
+		destRes = dest.Get()
+		require.Equal(t, 2, len(destRes), "two comment notified")
+		assert.Equal(t, "p2", destRes[1].Comment.ID)
+		assert.Equal(t, "p1", destRes[1].parent.ID)
+		assert.Equal(t, "u1", destRes[1].parent.User.ID)
+		assert.ElementsMatch(t, []string{"u1@example.com"}, destRes[1].Emails)

-	// reply to the second comment from u3 with email set
-	s.Submit(Request{Comment: dataStore.data["p3"]})
-	time.Sleep(time.Millisecond * 110)
+		// reply to the second comment from u3 with email set
+		s.Submit(Request{Comment: dataStore.data["p3"]})
+		synctest.Wait()

-	destRes = dest.Get()
-	require.Equal(t, 3, len(destRes), "three comment notified")
-	assert.Equal(t, "p3", destRes[2].Comment.ID)
-	assert.Equal(t, "p2", destRes[2].parent.ID)
-	assert.Equal(t, "u2", destRes[2].parent.User.ID)
-	assert.ElementsMatch(t, []string{"u1@example.com"}, destRes[2].Emails)
+		destRes = dest.Get()
+		require.Equal(t, 3, len(destRes), "three comment notified")
+		assert.Equal(t, "p3", destRes[2].Comment.ID)
+		assert.Equal(t, "p2", destRes[2].parent.ID)
+		assert.Equal(t, "u2", destRes[2].parent.User.ID)
+		assert.ElementsMatch(t, []string{"u1@example.com"}, destRes[2].Emails)

-	// reply to the third comment from u1 (author of the first comment), only u3 should be notified
-	s.Submit(Request{Comment: dataStore.data["p4"]})
-	time.Sleep(time.Millisecond * 110)
+		// reply to the third comment from u1 (author of the first comment), only u3 should be notified
+		s.Submit(Request{Comment: dataStore.data["p4"]})
+		synctest.Wait()

-	destRes = dest.Get()
-	require.Equal(t, 4, len(destRes), "four comment notified once each")
-	assert.Equal(t, "p4", destRes[3].Comment.ID)
-	assert.Equal(t, "p3", destRes[3].parent.ID)
-	assert.Equal(t, "u3", destRes[3].parent.User.ID)
-	assert.ElementsMatch(t, []string{"u3@example.com"}, destRes[3].Emails, "u1 is not notified they are the one who left the comment")
+		destRes = dest.Get()
+		require.Equal(t, 4, len(destRes), "four comment notified once each")
+		assert.Equal(t, "p4", destRes[3].Comment.ID)
+		assert.Equal(t, "p3", destRes[3].parent.ID)
+		assert.Equal(t, "u3", destRes[3].parent.User.ID)
+		assert.ElementsMatch(t, []string{"u3@example.com"}, destRes[3].Emails, "u1 is not notified they are the one who left the comment")

-	// reply to the fourth comment from u4, u1 and u3 should be notified once as a result
-	s.Submit(Request{Comment: dataStore.data["p5"]})
-	time.Sleep(time.Millisecond * 110)
+		// reply to the fourth comment from u4, u1 and u3 should be notified once as a result
+		s.Submit(Request{Comment: dataStore.data["p5"]})
+		synctest.Wait()

-	destRes = dest.Get()
-	require.Equal(t, 5, len(destRes), "four comment notified once each")
-	assert.Equal(t, "p5", destRes[4].Comment.ID)
-	assert.Equal(t, "p4", destRes[4].parent.ID)
-	assert.Equal(t, "u1", destRes[4].parent.User.ID)
-	assert.ElementsMatch(t, []string{"u1@example.com", "u3@example.com"}, destRes[4].Emails, "u3 and u1 notified once")
+		destRes = dest.Get()
+		require.Equal(t, 5, len(destRes), "four comment notified once each")
+		assert.Equal(t, "p5", destRes[4].Comment.ID)
+		assert.Equal(t, "p4", destRes[4].parent.ID)
+		assert.Equal(t, "u1", destRes[4].parent.User.ID)
+		assert.ElementsMatch(t, []string{"u1@example.com", "u3@example.com"}, destRes[4].Emails, "u3 and u1 notified once")

-	s.Close()
+		s.Close()
+	})
 }

 func TestService_Nop(t *testing.T) {
@@ -0,0 +1,77 @@
+package notify
+
+import (
+	"fmt"
+	"strings"
+
+	"golang.org/x/net/html"
+)
+
+// pruneHTML prunes string keeping HTML closing tags.
+// maxLength applies to visible text only, not HTML tags.
+func pruneHTML(htmlText string, maxLength int) string {
+	var result strings.Builder
+	var endTokens []string
+	visibleLen := 0
+
+	suffix := "..."
+	suffixLen := len(suffix)
+
+	tokenizer := html.NewTokenizer(strings.NewReader(htmlText))
+	for {
+		if tokenizer.Next() == html.ErrorToken {
+			return result.String()
+		}
+		token := tokenizer.Token()
+
+		switch token.Type {
+		case html.CommentToken, html.DoctypeToken:
+			continue
+
+		case html.StartTagToken:
+			endTokens = append([]string{fmt.Sprintf("</%s>", token.Data)}, endTokens...)
+			result.WriteString(token.String())
+
+		case html.EndTagToken:
+			if len(endTokens) > 0 {
+				endTokens = endTokens[1:]
+			}
+			result.WriteString(token.String())
+
+		case html.SelfClosingTagToken:
+			result.WriteString(token.String())
+
+		case html.TextToken:
+			text := token.String()
+			if visibleLen+len(text)+suffixLen > maxLength {
+				remaining := maxLength - visibleLen - suffixLen
+				text = pruneStringToWord(text, remaining)
+				result.WriteString(text)
+				result.WriteString(suffix)
+				for _, endTag := range endTokens {
+					result.WriteString(endTag)
+				}
+				return result.String()
+			}
+			visibleLen += len(text)
+			result.WriteString(text)
+		}
+	}
+}
+
+// pruneStringToWord prunes string to specified length respecting word boundaries
+func pruneStringToWord(text string, maxLength int) string {
+	if maxLength <= 0 {
+		return ""
+	}
+	if len(text) <= maxLength {
+		return text
+	}
+
+	// find last space at or before maxLength to cut at word boundary
+	lastSpace := strings.LastIndex(text[:maxLength+1], " ")
+	if lastSpace <= 0 {
+		return ""
+	}
+	return text[:lastSpace]
+}
@@ -0,0 +1,47 @@
+package notify
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPruneHTML(t *testing.T) {
+	tests := []struct {
+		name      string
+		html      string
+		maxLength int
+		expected  string
+	}{
+		{"within limit", "<p>Hello</p>", 20, "<p>Hello</p>"},
+		{"exceeds limit", "<p>Hello world, this is a long text</p>", 15, "<p>Hello world,...</p>"},
+		{"nested tags", "<div><p>Hello world</p><p>More text</p></div>", 20, "<div><p>Hello world</p><p>More...</p></div>"},
+		{"html comment stripped", "<!-- comment --><p>Hello</p>", 20, "<p>Hello</p>"},
+		{"self-closing tag", "<p>Hello<br/>World</p>", 8, "<p>Hello<br/>...</p>"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equal(t, tt.expected, pruneHTML(tt.html, tt.maxLength))
+		})
+	}
+}
+
+func TestPruneStringToWord(t *testing.T) {
+	tests := []struct {
+		name      string
+		text      string
+		maxLength int
+		expected  string
+	}{
+		{"within limit", "hello world", 15, "hello world"},
+		{"cut at word boundary", "hello world and more", 11, "hello world"},
+		{"zero length", "hello", 0, ""},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equal(t, tt.expected, pruneStringToWord(tt.text, tt.maxLength))
+		})
+	}
+}
@@ -10,6 +10,8 @@ import (
 	"github.com/hashicorp/go-multierror"
 )

+const commentTextLengthLimit = 100
+
 // TelegramParams contain settings for telegram notifications
 type TelegramParams struct {
 	AdminChannelID       string        // unique identifier for the target chat or username of the target channel (in the format @channelusername)
@@ -85,10 +87,10 @@ func (t *Telegram) buildMessage(req Request) string {
 		msg += fmt.Sprintf(" -> <a href=%q>%s</a>", commentURLPrefix+req.parent.ID, ntf.EscapeTelegramText(req.parent.User.Name))
 	}

-	msg += fmt.Sprintf("\n\n%s", ntf.TelegramSupportedHTML(req.Comment.Text))
+	msg += fmt.Sprintf("\n\n%s", pruneHTML(ntf.TelegramSupportedHTML(req.Comment.Text), commentTextLengthLimit))

 	if req.Comment.ParentID != "" {
-		msg += fmt.Sprintf("\n\n\"<i>%s</i>\"", ntf.TelegramSupportedHTML(req.parent.Text))
+		msg += fmt.Sprintf("\n\n\"<i>%s</i>\"", pruneHTML(ntf.TelegramSupportedHTML(req.parent.Text), commentTextLengthLimit))
 	}

 	if req.Comment.PostTitle != "" {
@@ -53,6 +53,15 @@ some text

 <b>Hello</b><i><b>World</b></i>`,
 		res)
+
+	// prune string keeping HTML closing tags
+	c = store.Comment{
+		Text: "<b>Lorem ipsum <i>dolor sit amet</i>, consectetur adipiscing <code>elit, sed do eiusmod tempor incididunt</code> ut labore et dolore magna aliqua.</b>",
+	}
+	res = tb.buildMessage(Request{Comment: c})
+	assert.Equal(t, `<a href="#remark42__comment-"></a>
+
+<b>Lorem ipsum <i>dolor sit amet</i>, consectetur adipiscing <code>elit, sed do eiusmod tempor incididunt</code> ut...</b>`, res)
 }

 func TestTelegram_SendVerification(t *testing.T) {
@@ -3,6 +3,7 @@ package notify
 import (
 	"bytes"
 	"context"
+	"encoding/json"
 	"fmt"
 	"text/template"
 	"time"
@@ -12,7 +13,7 @@ import (
 )

 const (
-	webhookDefaultTemplate = `{"text": "{{.Text}}"}`
+	webhookDefaultTemplate = `{"text": {{.Text | escapeJSONString}}}`
 )

 // WebhookParams contain settings for webhook notifications
@@ -49,7 +50,7 @@ func NewWebhook(params WebhookParams) (*Webhook, error) {
 		params.Template = webhookDefaultTemplate
 	}

-	payloadTmpl, err := template.New("webhook").Parse(params.Template)
+	payloadTmpl, err := template.New("webhook").Funcs(template.FuncMap{"escapeJSONString": escapeJSONString}).Parse(params.Template)
 	if err != nil {
 		return nil, fmt.Errorf("unable to parse webhook template: %w", err)
 	}
@@ -82,3 +83,12 @@ func (w *Webhook) SendVerification(_ context.Context, _ VerificationRequest) err
 func (w *Webhook) String() string {
 	return fmt.Sprintf("%s to %s", w.Webhook.String(), w.url)
 }
+
+// escapeJSONString escapes string for JSON
+func escapeJSONString(s string) (string, error) {
+	b, err := json.Marshal(s)
+	if err != nil {
+		return "", err
+	}
+	return string(b), nil
+}
@@ -2,6 +2,9 @@ package notify

 import (
 	"context"
+	"io"
+	"net/http"
+	"net/http/httptest"
 	"testing"
 	"time"

@@ -34,6 +37,32 @@ func TestWebhook_NewWebhook(t *testing.T) {
 	assert.Contains(t, err.Error(), "unable to parse webhook template")
 }

+// https://github.com/umputun/remark42/issues/1791
+func TestWebhook_ReceiveValidJSON(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(_ http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, r.URL.Path, "/webhook-notify")
+		assert.Equal(t, "POST", r.Method)
+		body, err := io.ReadAll(r.Body)
+		assert.NoError(t, err)
+		t.Log("received body", string(body))
+		assert.JSONEq(t, `{"text": "<p>testme</p>\n"}`, string(body))
+	}))
+	defer ts.Close()
+
+	wh, err := NewWebhook(WebhookParams{
+		URL:     ts.URL + "/webhook-notify",
+		Headers: []string{"Content-Type:application/json,text/plain"},
+	})
+	assert.NoError(t, err)
+	assert.NotNil(t, wh)
+
+	f := store.NewCommentFormatter()
+	c := store.Comment{Text: f.FormatText("testme", false), ParentID: "1", ID: "999"}
+
+	err = wh.Send(context.Background(), Request{Comment: c})
+	assert.NoError(t, err)
+}
+
 func TestWebhook_Send(t *testing.T) {
 	wh, err := NewWebhook(WebhookParams{
 		URL:     "bad-url",
@@ -15,7 +15,7 @@ import (
 )

 type tgRequester interface {
-	Request(ctx context.Context, method string, b []byte, data interface{}) error
+	Request(ctx context.Context, method string, b []byte, data any) error
 }

 // TGUpdatesReceiver used to dispatch telegram updates to multiple receivers
@@ -27,8 +27,8 @@ type TGUpdatesReceiver interface {
 // DispatchTelegramUpdates dispatches telegram updates to provided list of receivers
 // Blocks caller
 func DispatchTelegramUpdates(ctx context.Context, requester tgRequester, receivers []TGUpdatesReceiver, period time.Duration) {
-	// Identifier of the first update to be requested.
-	// Should be equal to LastSeenUpdateID + 1
+	// identifier of the first update to be requested.
+	// should be equal to LastSeenUpdateID + 1
 	// See https://core.telegram.org/bots/api#getupdates
 	var updateOffset int

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"testing"
+	"testing/synctest"
 	"time"

 	ntf "github.com/go-pkgz/notify"
@@ -12,12 +13,14 @@ import (
 )

 func TestDispatchTelegramUpdates(t *testing.T) {
-	ctx, cancel := context.WithCancel(context.Background())
-	poolPeriod := time.Millisecond * 100
-	go DispatchTelegramUpdates(ctx, &mockTGRequester{t: t}, []TGUpdatesReceiver{&mockTGUpdatesReceiver{t: t}}, poolPeriod)
-	time.Sleep(poolPeriod * 3)
-	cancel()
-	time.Sleep(poolPeriod)
+	synctest.Test(t, func(t *testing.T) {
+		ctx, cancel := context.WithCancel(context.Background())
+		poolPeriod := time.Millisecond * 100
+		go DispatchTelegramUpdates(ctx, &mockTGRequester{t: t}, []TGUpdatesReceiver{&mockTGUpdatesReceiver{t: t}}, poolPeriod)
+		time.Sleep(poolPeriod * 3)
+		cancel()
+		synctest.Wait()
+	})
 }

 const getUpdatesResp = `{
@@ -39,7 +42,7 @@ type mockTGRequester struct {
 	t   *testing.T
 }

-func (m *mockTGRequester) Request(_ context.Context, _ string, _ []byte, data interface{}) error {
+func (m *mockTGRequester) Request(_ context.Context, _ string, _ []byte, data any) error {
 	if m.hit < 2 {
 		m.hit++
 		assert.NoError(m.t, json.Unmarshal([]byte(getUpdatesResp), data))
@@ -7,9 +7,8 @@ import (
 	"time"

 	"github.com/go-chi/chi/v5"
-	"github.com/go-chi/render"
-	"github.com/go-pkgz/auth"
-	cache "github.com/go-pkgz/lcw"
+	"github.com/go-pkgz/auth/v2"
+	cache "github.com/go-pkgz/lcw/v2"
 	log "github.com/go-pkgz/lgr"
 	R "github.com/go-pkgz/rest"

@@ -54,8 +53,7 @@ func (a *admin) deleteCommentCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	a.cache.Flush(cache.Flusher(locator.SiteID).Scopes(locator.SiteID, locator.URL, lastCommentsScope))
-	render.Status(r, http.StatusOK)
-	render.JSON(w, r, R.JSON{"id": id, "locator": locator})
+	R.RenderJSON(w, R.JSON{"id": id, "locator": locator})
 }

 // DELETE /user/{userid}?site=side-id - delete all user comments for requested userid
@@ -69,8 +67,7 @@ func (a *admin) deleteUserCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	a.cache.Flush(cache.Flusher(siteID).Scopes(userID, siteID, lastCommentsScope))
-	render.Status(r, http.StatusOK)
-	render.JSON(w, r, R.JSON{"user_id": userID, "site_id": siteID})
+	R.RenderJSON(w, R.JSON{"user_id": userID, "site_id": siteID})
 }

 // GET /user/{userid}?site=side-id - get user info for requested userid
@@ -84,8 +81,7 @@ func (a *admin) getUserInfoCtrl(w http.ResponseWriter, r *http.Request) {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't get user info", rest.ErrInternal)
 		return
 	}
-	render.Status(r, http.StatusOK)
-	render.JSON(w, r, ucomments[0].User)
+	R.RenderJSON(w, ucomments[0].User)
 }

 // GET /deleteme?token=jwt - delete all user comments and details by user's request. Gets info about deleted used from provided token
@@ -107,13 +103,21 @@ func (a *admin) deleteMeRequestCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}

-	if err = a.dataService.DeleteUserDetail(claims.Audience, claims.User.ID, engine.AllUserDetails); err != nil {
+	// audience is a slice but we set it to a single element, and situation when there is no audience or there are more than one is unexpected
+	if len(claims.Audience) != 1 {
+		rest.SendErrorJSON(w, r, http.StatusBadRequest, fmt.Errorf("bad request"), "can't process token, claims.Audience expected to be a single element but it's not", rest.ErrActionRejected)
+		return
+	}
+
+	audience := claims.Audience[0]
+
+	if err = a.dataService.DeleteUserDetail(audience, claims.User.ID, engine.AllUserDetails); err != nil {
 		code := parseError(err, rest.ErrInternal)
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't delete user details for user", code)
 		return
 	}

-	if err = a.dataService.DeleteUser(claims.Audience, claims.User.ID, store.HardDelete); err != nil {
+	if err = a.dataService.DeleteUser(audience, claims.User.ID, store.HardDelete); err != nil {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't delete user", rest.ErrNoAccess)
 		return
 	}
@@ -126,9 +130,8 @@ func (a *admin) deleteMeRequestCtrl(w http.ResponseWriter, r *http.Request) {
 		}
 	}

-	a.cache.Flush(cache.Flusher(claims.Audience).Scopes(claims.Audience, claims.User.ID, lastCommentsScope))
-	render.Status(r, http.StatusOK)
-	render.JSON(w, r, R.JSON{"user_id": claims.User.ID, "site_id": claims.Audience})
+	a.cache.Flush(cache.Flusher(audience).Scopes(audience, claims.User.ID, lastCommentsScope))
+	R.RenderJSON(w, R.JSON{"user_id": claims.User.ID, "site_id": claims.Audience})
 }

 // PUT /user/{userid}?site=side-id&block=1&ttl=7d - block or unblock user
@@ -156,7 +159,7 @@ func (a *admin) setBlockCtrl(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 	a.cache.Flush(cache.Flusher(siteID).Scopes(userID, siteID, lastCommentsScope))
-	render.JSON(w, r, R.JSON{"user_id": userID, "site_id": siteID, "block": blockStatus})
+	R.RenderJSON(w, R.JSON{"user_id": userID, "site_id": siteID, "block": blockStatus})
 }

 // GET /blocked?site=siteID - list blocked users
@@ -167,7 +170,7 @@ func (a *admin) blockedUsersCtrl(w http.ResponseWriter, r *http.Request) {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't get blocked users", rest.ErrSiteNotFound)
 		return
 	}
-	render.JSON(w, r, users)
+	R.RenderJSON(w, users)
 }

 // PUT /readonly?site=siteID&url=post-url&ro=1 - set or reset read-only status for the post
@@ -194,7 +197,7 @@ func (a *admin) setReadOnlyCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	a.cache.Flush(cache.Flusher(locator.SiteID).Scopes(locator.URL, locator.SiteID))
-	render.JSON(w, r, R.JSON{"locator": locator, "read-only": roStatus})
+	R.RenderJSON(w, R.JSON{"locator": locator, "read-only": roStatus})
 }

 // PUT /title/{id}?site=siteID&url=post-url - set comment PostTitle to page's title
@@ -210,8 +213,7 @@ func (a *admin) setTitleCtrl(w http.ResponseWriter, r *http.Request) {
 	log.Printf("[INFO] set comment's title %s to %q", id, c.PostTitle)

 	a.cache.Flush(cache.Flusher(locator.SiteID).Scopes(locator.URL, lastCommentsScope))
-	render.Status(r, http.StatusOK)
-	render.JSON(w, r, R.JSON{"id": id, "locator": locator})
+	R.RenderJSON(w, R.JSON{"id": id, "locator": locator})
 }

 // PUT /verify?site=siteID&url=post-url&ro=1 - set or reset read-only status for the post
@@ -225,7 +227,7 @@ func (a *admin) setVerifyCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	a.cache.Flush(cache.Flusher(siteID).Scopes(siteID, userID))
-	render.JSON(w, r, R.JSON{"user": userID, "verified": verifyStatus})
+	R.RenderJSON(w, R.JSON{"user": userID, "verified": verifyStatus})
 }

 // PUT /pin/{id}?site=siteID&url=post-url&pin=1
@@ -240,5 +242,5 @@ func (a *admin) setPinCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	a.cache.Flush(cache.Flusher(locator.SiteID).Scopes(locator.URL))
-	render.JSON(w, r, R.JSON{"id": commentID, "locator": locator, "pin": pinStatus})
+	R.RenderJSON(w, R.JSON{"id": commentID, "locator": locator, "pin": pinStatus})
 }
@@ -13,10 +13,10 @@ import (
 	"testing"
 	"time"

-	"github.com/go-pkgz/auth/token"
-	cache "github.com/go-pkgz/lcw"
+	"github.com/go-pkgz/auth/v2/token"
+	cache "github.com/go-pkgz/lcw/v2"
 	R "github.com/go-pkgz/rest"
-	"github.com/golang-jwt/jwt"
+	"github.com/golang-jwt/jwt/v5"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"

@@ -87,7 +87,7 @@ func TestAdmin_Delete(t *testing.T) {
 	// check count updated
 	res, code = get(t, ts.URL+"/api/v1/count?site=remark42&url=https://radio-t.com/blah")
 	assert.Equal(t, http.StatusOK, code)
-	b := map[string]interface{}{}
+	b := map[string]any{}
 	err = json.Unmarshal([]byte(res), &b)
 	assert.NoError(t, err)
 	t.Logf("%#v", b)
@@ -111,7 +111,7 @@ func TestAdmin_Title(t *testing.T) {
 	ts, srv, teardown := startupT(t)
 	defer teardown()

-	srv.DataService.TitleExtractor = service.NewTitleExtractor(http.Client{Timeout: time.Second})
+	srv.DataService.TitleExtractor = service.NewTitleExtractor(http.Client{Timeout: time.Second}, []string{"127.0.0.1"})
 	tss := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.URL.String() == "/post1" {
 			_, err := w.Write([]byte("<html><title>post1 blah 123</title><body> 2222</body></html>"))
@@ -348,7 +348,7 @@ func TestAdmin_Block(t *testing.T) {
 	assert.Equal(t, "test test #1", comments.Comments[2].Text, "comment not removed and not cleared")
 	assert.False(t, comments.Comments[2].Deleted, "not deleted")

-	srv.pubRest.cache = cache.NewScache(cache.NewNopCache()) // TODO: with lru cache it won't be refreshed and invalidated for long
+	srv.pubRest.cache = cache.NewScache[[]byte](cache.NewNopCache[[]byte]()) // TODO: with lru cache it won't be refreshed and invalidated for long
 	// time
 	time.Sleep(50 * time.Millisecond)
 	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah&sort=+time")
@@ -465,7 +465,7 @@ func TestAdmin_ReadOnly(t *testing.T) {
 		Locator: store.Locator{SiteID: "remark42", URL: "https://radio-t.com/blah"}}
 	b, err := json.Marshal(c)
 	assert.NoError(t, err, "can't marshal comment %+v", c)
-	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment", bytes.NewBuffer(b))
+	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment?site=remark42", bytes.NewBuffer(b))
 	require.NoError(t, err)
 	resp, err = sendReq(t, req, adminUmputunToken)
 	require.NoError(t, err)
@@ -489,7 +489,7 @@ func TestAdmin_ReadOnly(t *testing.T) {
 		Locator: store.Locator{SiteID: "remark42", URL: "https://radio-t.com/blah"}}
 	b, err = json.Marshal(c)
 	assert.NoError(t, err, "can't marshal comment %+v", c)
-	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment", bytes.NewBuffer(b))
+	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment?site="+c.Locator.SiteID, bytes.NewBuffer(b))
 	require.NoError(t, err)
 	resp, err = sendReq(t, req, adminUmputunToken)
 	require.NoError(t, err)
@@ -513,6 +513,7 @@ func TestAdmin_ReadOnlyNoComments(t *testing.T) {
 	_, err = srv.DataService.Info(store.Locator{SiteID: "remark42", URL: "https://radio-t.com/blah"}, 0)
 	assert.Error(t, err)

+	// test format "tree"
 	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah&format=tree")
 	assert.Equal(t, http.StatusOK, code)
 	comments := commentsWithInfo{}
@@ -521,6 +522,16 @@ func TestAdmin_ReadOnlyNoComments(t *testing.T) {
 	assert.Equal(t, 0, len(comments.Comments), "should have 0 comments")
 	assert.True(t, comments.Info.ReadOnly)
 	t.Logf("%+v", comments)
+
+	// test format "plain"
+	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah")
+	assert.Equal(t, http.StatusOK, code)
+	comments = commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	assert.NoError(t, err)
+	assert.Equal(t, 0, len(comments.Comments), "should have 0 comments")
+	assert.True(t, comments.Info.ReadOnly)
+	t.Logf("%+v", comments)
 }

 func TestAdmin_ReadOnlyWithAge(t *testing.T) {
@@ -697,17 +708,17 @@ func TestAdmin_DeleteMeRequest(t *testing.T) {

 	claims := token.Claims{
 		SessionOnly: true,
-		StandardClaims: jwt.StandardClaims{
-			Audience:  "remark42",
-			Id:        "1234567",
+		RegisteredClaims: jwt.RegisteredClaims{
+			Audience:  jwt.ClaimStrings{"remark42"},
+			ID:        "1234567",
 			Issuer:    "remark42",
-			NotBefore: time.Now().Add(-1 * time.Minute).Unix(),
-			ExpiresAt: time.Now().Add(30 * time.Minute).Unix(),
+			NotBefore: jwt.NewNumericDate(time.Now().Add(-1 * time.Minute)),
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(30 * time.Minute)),
 		},
 		User: &token.User{
 			ID:      "user1",
 			Picture: "pic.image",
-			Attributes: map[string]interface{}{
+			Attributes: map[string]any{
 				"delete_me": true,
 			},
 		},
@@ -766,16 +777,16 @@ func TestAdmin_DeleteMeRequestFailed(t *testing.T) {
 	// try with bad auth
 	claims := token.Claims{
 		SessionOnly: true,
-		StandardClaims: jwt.StandardClaims{
-			Audience:  "remark42",
-			Id:        "provider1_1234567",
+		RegisteredClaims: jwt.RegisteredClaims{
+			Audience:  jwt.ClaimStrings{"remark42"},
+			ID:        "provider1_1234567",
 			Issuer:    "remark42",
-			NotBefore: time.Now().Add(-1 * time.Minute).Unix(),
-			ExpiresAt: time.Now().Add(30 * time.Minute).Unix(),
+			NotBefore: jwt.NewNumericDate(time.Now().Add(-1 * time.Minute)),
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(30 * time.Minute)),
 		},
 		User: &token.User{
 			ID: "provider1_user1",
-			Attributes: map[string]interface{}{
+			Attributes: map[string]any{
 				"delete_me": true,
 			},
 		},
@@ -792,9 +803,9 @@ func TestAdmin_DeleteMeRequestFailed(t *testing.T) {
 	assert.Equal(t, http.StatusForbidden, resp.StatusCode)

 	// try bad user
-	badClaims := claims
-	badClaims.User.ID = "no-such-id"
-	tkn, err = srv.Authenticator.TokenService().Token(badClaims)
+	badClaimsUser := claims
+	badClaimsUser.User.ID = "no-such-id"
+	tkn, err = srv.Authenticator.TokenService().Token(badClaimsUser)
 	assert.NoError(t, err)
 	req, err = http.NewRequest(http.MethodGet, fmt.Sprintf("%s/api/v1/admin/deleteme?token=%s", ts.URL, tkn), http.NoBody)
 	assert.NoError(t, err)
@@ -803,11 +814,12 @@ func TestAdmin_DeleteMeRequestFailed(t *testing.T) {
 	assert.NoError(t, err)
 	assert.NoError(t, resp.Body.Close())
 	assert.Equal(t, http.StatusBadRequest, resp.StatusCode, resp.Status)
+	badClaimsUser.User.ID = "provider1_user1"

 	// try without deleteme flag
-	badClaims2 := claims
-	badClaims2.User.SetBoolAttr("delete_me", false)
-	tkn, err = srv.Authenticator.TokenService().Token(badClaims2)
+	badClaimsWithoutDeleteMe := claims
+	badClaimsWithoutDeleteMe.User.SetBoolAttr("delete_me", false)
+	tkn, err = srv.Authenticator.TokenService().Token(badClaimsWithoutDeleteMe)
 	assert.NoError(t, err)
 	req, err = http.NewRequest(http.MethodGet, fmt.Sprintf("%s/api/v1/admin/deleteme?token=%s", ts.URL, tkn), http.NoBody)
 	assert.NoError(t, err)
@@ -818,7 +830,25 @@ func TestAdmin_DeleteMeRequestFailed(t *testing.T) {
 	b, err := io.ReadAll(resp.Body)
 	assert.NoError(t, err)
 	assert.NoError(t, resp.Body.Close())
-	assert.True(t, strings.Contains(string(b), "can't use provided token"))
+	assert.Contains(t, string(b), "can't use provided token")
+	badClaimsWithoutDeleteMe.User.SetBoolAttr("delete_me", true)
+
+	// try with wrong audience
+	badClaimsMultipleAudience := claims
+	badClaimsMultipleAudience.Audience = jwt.ClaimStrings{"remark42", "something else"}
+	tkn, err = srv.Authenticator.TokenService().Token(badClaimsMultipleAudience)
+	assert.NoError(t, err)
+	req, err = http.NewRequest(http.MethodGet, fmt.Sprintf("%s/api/v1/admin/deleteme?token=%s", ts.URL, tkn), http.NoBody)
+	assert.NoError(t, err)
+	req.SetBasicAuth("admin", "password")
+	resp, err = client.Do(req)
+	assert.NoError(t, err)
+	assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
+	b, err = io.ReadAll(resp.Body)
+	assert.NoError(t, err)
+	assert.NoError(t, resp.Body.Close())
+	assert.Contains(t, string(b), "can't process token, claims.Audience expected to be a single element but it's not")
+	badClaimsMultipleAudience.Audience = jwt.ClaimStrings{"remark42"}
 }

 func TestAdmin_GetUserInfo(t *testing.T) {
@@ -1,17 +1,18 @@
 package api

 import (
+	"bytes"
 	"compress/gzip"
 	"context"
 	"fmt"
 	"io"
 	"net/http"
 	"os"
+	"strconv"
 	"sync"
 	"time"

-	"github.com/go-chi/render"
-	cache "github.com/go-pkgz/lcw"
+	cache "github.com/go-pkgz/lcw/v2"
 	log "github.com/go-pkgz/lgr"
 	R "github.com/go-pkgz/rest"

@@ -58,8 +59,7 @@ func (m *Migrator) importCtrl(w http.ResponseWriter, r *http.Request) {

 	go m.runImport(siteID, r.URL.Query().Get("provider"), tmpfile) // import runs in background and sets busy flag for site

-	render.Status(r, http.StatusAccepted)
-	render.JSON(w, r, R.JSON{"status": "import request accepted"})
+	_ = R.EncodeJSON(w, http.StatusAccepted, R.JSON{"status": "import request accepted"})
 }

 // POST /import/form?secret=key&site=site-id&provider=disqus|remark|wordpress
@@ -73,6 +73,7 @@ func (m *Migrator) importFormCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}

+	r.Body = http.MaxBytesReader(w, r.Body, 256*1024*1024) // hard cap on upload to prevent memory exhaustion
 	if err := r.ParseMultipartForm(20 * 1024 * 1024); err != nil { // 20M max memory, if bigger will make a file
 		rest.SendErrorJSON(w, r, http.StatusInternalServerError, err, "can't parse multipart form", rest.ErrDecode)
 		return
@@ -93,8 +94,7 @@ func (m *Migrator) importFormCtrl(w http.ResponseWriter, r *http.Request) {

 	go m.runImport(siteID, r.URL.Query().Get("provider"), tmpfile) // import runs in background and sets busy flag for site

-	render.Status(r, http.StatusAccepted)
-	render.JSON(w, r, R.JSON{"status": "import request accepted"})
+	_ = R.EncodeJSON(w, http.StatusAccepted, R.JSON{"status": "import request accepted"})
 }

 // GET /wait?site=site-id
@@ -110,20 +110,16 @@ func (m *Migrator) waitCtrl(w http.ResponseWriter, r *http.Request) {

 	ctx, cancel := context.WithTimeout(context.Background(), timeOut)
 	defer cancel()
-	for {
-		if !m.isBusy(siteID) {
-			break
-		}
+	for m.isBusy(siteID) {
+
 		select {
 		case <-ctx.Done():
-			render.Status(r, http.StatusGatewayTimeout)
-			render.JSON(w, r, R.JSON{"status": "timeout expired", "site_id": siteID})
+			_ = R.EncodeJSON(w, http.StatusGatewayTimeout, R.JSON{"status": "timeout expired", "site_id": siteID})
 			return
 		case <-time.After(100 * time.Millisecond):
 		}
 	}
-	render.Status(r, http.StatusOK)
-	render.JSON(w, r, R.JSON{"status": "completed", "site_id": siteID})
+	R.RenderJSON(w, R.JSON{"status": "completed", "site_id": siteID})
 }

 // GET /export?site=site-id&secret=12345&?mode=file|stream
@@ -131,24 +127,32 @@ func (m *Migrator) waitCtrl(w http.ResponseWriter, r *http.Request) {
 func (m *Migrator) exportCtrl(w http.ResponseWriter, r *http.Request) {
 	siteID := r.URL.Query().Get("site")

-	var writer io.Writer = w
 	if r.URL.Query().Get("mode") == "file" {
+		// buffer to memory to handle errors before committing to response
+		var buf bytes.Buffer
+		gzWriter := gzip.NewWriter(&buf)
+		if _, err := m.NativeExporter.Export(gzWriter, siteID); err != nil {
+			rest.SendErrorJSON(w, r, http.StatusInternalServerError, err, "export failed", rest.ErrInternal)
+			return
+		}
+		if err := gzWriter.Close(); err != nil {
+			rest.SendErrorJSON(w, r, http.StatusInternalServerError, err, "export failed", rest.ErrInternal)
+			return
+		}
+
 		exportFile := fmt.Sprintf("%s-%s.json.gz", siteID, time.Now().Format("20060102"))
 		w.Header().Set("Content-Type", "application/gzip")
 		w.Header().Set("Content-Disposition", "attachment;filename="+exportFile)
-		w.WriteHeader(http.StatusOK)
-		gzWriter := gzip.NewWriter(w)
-		defer func() {
-			if e := gzWriter.Close(); e != nil {
-				log.Printf("[WARN] can't close gzip writer, %s", e)
-			}
-		}()
-		writer = gzWriter
+		w.Header().Set("Content-Length", strconv.Itoa(buf.Len()))
+		if _, err := io.Copy(w, &buf); err != nil {
+			log.Printf("[WARN] failed to write export response: %v", err)
+		}
+		return
 	}

-	if _, err := m.NativeExporter.Export(writer, siteID); err != nil {
+	// stream mode - write directly to response
+	if _, err := m.NativeExporter.Export(w, siteID); err != nil {
 		rest.SendErrorJSON(w, r, http.StatusInternalServerError, err, "export failed", rest.ErrInternal)
-		return
 	}
 }

@@ -177,7 +181,7 @@ func (m *Migrator) remapCtrl(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 		defer func() {
-			if e = os.Remove(fh.Name()); e != nil {
+			if e = os.Remove(fh.Name()); e != nil { //nolint:gosec // fh.Name() is from os.CreateTemp, server-controlled
 				log.Printf("[WARN] failed to remove temp file %+v", e)
 			}
 		}()
@@ -204,8 +208,7 @@ func (m *Migrator) remapCtrl(w http.ResponseWriter, r *http.Request) {
 		log.Printf("[DEBUG] convert request completed. site=%s, comments=%d", siteID, size)
 	}()

-	render.Status(r, http.StatusAccepted)
-	render.JSON(w, r, R.JSON{"status": "convert request accepted"})
+	_ = R.EncodeJSON(w, http.StatusAccepted, R.JSON{"status": "convert request accepted"})
 }

 // runImport reads from tmpfile and import for given siteID and provider
@@ -9,6 +9,7 @@ import (
 	"mime/multipart"
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"strings"
 	"testing"
 	"time"
@@ -49,6 +50,22 @@ func TestMigrator_Import(t *testing.T) {
 	assert.NoError(t, resp.Body.Close())

 	waitForMigrationCompletion(t, ts)
+
+	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah1")
+	require.Equal(t, http.StatusOK, code)
+	comments := commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 1, comments.Info.Count)
+	require.Equal(t, 1, len(comments.Comments))
+
+	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&format=tree&url=https://radio-t.com/blah1")
+	require.Equal(t, http.StatusOK, code)
+	comments = commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 1, comments.Info.Count)
+	require.Equal(t, 1, len(comments.Comments))
 }

 func TestMigrator_ImportForm(t *testing.T) {
@@ -84,13 +101,29 @@ func TestMigrator_ImportForm(t *testing.T) {
 	assert.NoError(t, resp.Body.Close())

 	waitForMigrationCompletion(t, ts)
+
+	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah1")
+	require.Equal(t, http.StatusOK, code)
+	comments := commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 1, comments.Info.Count)
+	require.Equal(t, 1, len(comments.Comments))
+
+	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&format=tree&url=https://radio-t.com/blah1")
+	require.Equal(t, http.StatusOK, code)
+	comments = commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 1, comments.Info.Count)
+	require.Equal(t, 1, len(comments.Comments))
 }

 func TestMigrator_ImportFromWP(t *testing.T) {
 	ts, _, teardown := startupT(t)
 	defer teardown()

-	r := strings.NewReader(strings.Replace(xmlTestWP, "'", "`", -1))
+	r := strings.NewReader(strings.ReplaceAll(xmlTestWP, "'", "`"))

 	client := &http.Client{Timeout: 1 * time.Second}
 	defer client.CloseIdleConnections()
@@ -108,6 +141,22 @@ func TestMigrator_ImportFromWP(t *testing.T) {
 	assert.NoError(t, resp.Body.Close())

 	waitForMigrationCompletion(t, ts)
+
+	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://realmenweardress.es/2010/07/do-you-rp/")
+	require.Equal(t, http.StatusOK, code)
+	comments := commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 3, comments.Info.Count)
+	require.Equal(t, 3, len(comments.Comments))
+
+	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&format=tree&url=https://realmenweardress.es/2010/07/do-you-rp/")
+	require.Equal(t, http.StatusOK, code)
+	comments = commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 3, comments.Info.Count)
+	require.Equal(t, 2, len(comments.Comments), "2 comments with 1 reply")
 }

 func TestMigrator_ImportFromCommento(t *testing.T) {
@@ -115,7 +164,7 @@ func TestMigrator_ImportFromCommento(t *testing.T) {
 	defer teardown()

 	r := strings.NewReader(`{"version":1,"comments":[{"commentHex":"7d77e39fcd813241d6281478cc8f21ab5f807d043c750bc1a936bc23b34fb854",
-"domain":"example.com","url":"https://example.com/blog/post/1","commenterHex":"a1ac58ed1146bd7fe3feff6a7276f73955c3bfd23cacee00e2e0a7a89b1a8c10",
+"domain":"example.com","url":"/blog/post/1","commenterHex":"a1ac58ed1146bd7fe3feff6a7276f73955c3bfd23cacee00e2e0a7a89b1a8c10",
 "markdown":"Example content","html":"","parentHex":"root","score":0,"state":"approved","creationDate":"2021-03-17T12:09:47.722181Z",
 "direction":0,"deleted":false}],"commenters":[{"commenterHex":"a1ac58ed1146bd7fe3feff6a7276f73955c3bfd23cacee00e2e0a7a89b1a8c10",
 "email":"somegreatmail@gmail.com","name":"User5276","link":"https://example.com/profile/257","photo":"https://secure.gravatar.com/avatar/8f279626d26175134b0d5c88648172f7",
@@ -137,6 +186,63 @@ func TestMigrator_ImportFromCommento(t *testing.T) {
 	assert.NoError(t, resp.Body.Close())

 	waitForMigrationCompletion(t, ts)
+
+	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://example.com/blog/post/1")
+	require.Equal(t, http.StatusOK, code)
+	comments := commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 1, comments.Info.Count)
+	require.Equal(t, 1, len(comments.Comments))
+
+	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&format=tree&url=https://example.com/blog/post/1")
+	require.Equal(t, http.StatusOK, code)
+	comments = commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 1, comments.Info.Count)
+	require.Equal(t, 1, len(comments.Comments))
+}
+
+func TestMigrator_ImportFromCommentoJSON(t *testing.T) {
+	ts, _, teardown := startupT(t)
+	defer teardown()
+
+	r, err := os.Open("testdata/commento.json")
+	require.NoError(t, err)
+
+	client := &http.Client{Timeout: 1 * time.Second}
+	defer client.CloseIdleConnections()
+	req, err := http.NewRequest("POST", ts.URL+"/api/v1/admin/import?site=remark42&provider=commento", r)
+	assert.NoError(t, err)
+	req.Header.Add("Content-Type", "application/json; charset=utf-8")
+	req.SetBasicAuth("admin", "password")
+	resp, err := client.Do(req)
+	assert.NoError(t, err)
+	assert.Equal(t, http.StatusAccepted, resp.StatusCode)
+
+	b, err := io.ReadAll(resp.Body)
+	assert.NoError(t, err)
+	assert.Equal(t, "{\"status\":\"import request accepted\"}\n", string(b))
+	assert.NoError(t, resp.Body.Close())
+
+	waitForMigrationCompletion(t, ts)
+
+	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://example.com/example")
+	require.Equal(t, http.StatusOK, code)
+	comments := commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 7, comments.Info.Count)
+	require.Equal(t, 7, len(comments.Comments))
+
+	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&format=tree&url=https://example.com/example")
+	require.Equal(t, http.StatusOK, code)
+	comments = commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 7, comments.Info.Count)
+	require.Equal(t, 5, len(comments.Comments), "five comments with two replies")
 }

 func TestMigrator_ImportRejected(t *testing.T) {
@@ -170,8 +276,8 @@ func TestMigrator_ImportDouble(t *testing.T) {
 "picture":"/api/v1/avatar/remark.image","profile":"https://remark42.com","admin":true,
 "ip":"ae12fe3b5f129b5cc4cdd2b136b7b7947c4d2741"},"locator":{"site":"remark42","url":"https://radio-t.com/blah1"},"score":0,
 "votes":{},"time":"2018-04-30T01:37:00.849053725-05:00"}`
-	recs := []string{}
-	for i := 0; i < 50; i++ {
+	recs := make([]string, 0, 50)
+	for i := range 50 {
 		recs = append(recs, fmt.Sprintf(tmpl, i))
 	}
 	r := strings.NewReader(`{"version":1}` + strings.Join(recs, "\n")) // reader with 10k records
@@ -197,6 +303,20 @@ func TestMigrator_ImportDouble(t *testing.T) {
 	assert.NoError(t, resp.Body.Close())
 	assert.Equal(t, http.StatusConflict, resp.StatusCode)
 	waitForMigrationCompletion(t, ts)
+
+	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah1")
+	require.Equal(t, http.StatusOK, code)
+	comments := commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 50, comments.Info.Count)
+
+	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah1")
+	require.Equal(t, http.StatusOK, code)
+	comments = commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 50, comments.Info.Count)
 }

 func TestMigrator_ImportWaitExpired(t *testing.T) {
@@ -209,7 +329,7 @@ func TestMigrator_ImportWaitExpired(t *testing.T) {
 "votes":{},"time":"2018-04-30T01:37:00.849053725-05:00"}`
 	nRecs := 50
 	recs := make([]string, 0, nRecs)
-	for i := 0; i < nRecs; i++ {
+	for i := range nRecs {
 		recs = append(recs, fmt.Sprintf(tmpl, i))
 	}
 	r := strings.NewReader(`{"version":1}` + strings.Join(recs, "\n")) // reader with `nRecs` records
@@ -236,6 +356,14 @@ func TestMigrator_ImportWaitExpired(t *testing.T) {
 	assert.Equal(t, http.StatusGatewayTimeout, resp.StatusCode)

 	waitForMigrationCompletion(t, ts)
+
+	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://example.com/example")
+	require.Equal(t, http.StatusOK, code)
+	comments := commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 0, comments.Info.Count)
+	require.Equal(t, 0, len(comments.Comments))
 }

 func TestMigrator_Export(t *testing.T) {
@@ -263,6 +391,16 @@ func TestMigrator_Export(t *testing.T) {
 	require.Equal(t, http.StatusAccepted, resp.StatusCode)
 	waitForMigrationCompletion(t, ts)

+	// export wrong site, should result in error
+	req, err = http.NewRequest("GET", ts.URL+"/api/v1/admin/export?mode=file&site=test", http.NoBody)
+	require.NoError(t, err)
+	req.SetBasicAuth("admin", "password")
+	resp, err = client.Do(req)
+	require.NoError(t, err)
+	resp.Body.Close()
+	require.Equal(t, http.StatusInternalServerError, resp.StatusCode)
+	require.Equal(t, "application/json", resp.Header.Get("Content-Type"))
+
 	// check file mode
 	req, err = http.NewRequest("GET", ts.URL+"/api/v1/admin/export?mode=file&site=remark42", http.NoBody)
 	require.NoError(t, err)
@@ -339,6 +477,7 @@ func TestMigrator_Remap(t *testing.T) {
 	err = json.Unmarshal([]byte(res), &comments)
 	require.NoError(t, err)
 	require.Equal(t, 2, comments.Info.Count)
+	require.Equal(t, 2, len(comments.Comments))
 	require.False(t, comments.Info.ReadOnly)

 	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&url=https://remark42.com/demo-another/")
@@ -347,6 +486,7 @@ func TestMigrator_Remap(t *testing.T) {
 	err = json.Unmarshal([]byte(res), &comments)
 	require.NoError(t, err)
 	require.Equal(t, 1, comments.Info.Count)
+	require.Equal(t, 1, len(comments.Comments))
 	require.True(t, comments.Info.ReadOnly)

 	// we want remap urls to another domain - www.remark42.com
@@ -364,6 +504,16 @@ func TestMigrator_Remap(t *testing.T) {
 	err = json.Unmarshal([]byte(res), &comments)
 	require.NoError(t, err)
 	require.Equal(t, 2, comments.Info.Count)
+	require.Equal(t, 2, len(comments.Comments))
+	require.False(t, comments.Info.ReadOnly)
+
+	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&format=tree&url=https://www.remark42.com/demo/")
+	require.Equal(t, http.StatusOK, code)
+	comments = commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 2, comments.Info.Count)
+	require.Equal(t, 2, len(comments.Comments))
 	require.False(t, comments.Info.ReadOnly)

 	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&url=https://www.remark42.com/demo-another/")
@@ -372,6 +522,16 @@ func TestMigrator_Remap(t *testing.T) {
 	err = json.Unmarshal([]byte(res), &comments)
 	require.NoError(t, err)
 	require.Equal(t, 1, comments.Info.Count)
+	require.Equal(t, 1, len(comments.Comments))
+	require.True(t, comments.Info.ReadOnly)
+
+	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&format=tree&url=https://www.remark42.com/demo-another/")
+	require.Equal(t, http.StatusOK, code)
+	comments = commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	require.NoError(t, err)
+	require.Equal(t, 1, comments.Info.Count)
+	require.Equal(t, 1, len(comments.Comments))
 	require.True(t, comments.Info.ReadOnly)

 	// should find nothing from previous url
@@ -381,6 +541,7 @@ func TestMigrator_Remap(t *testing.T) {
 	err = json.Unmarshal([]byte(res), &comments)
 	require.NoError(t, err)
 	require.Equal(t, 0, comments.Info.Count)
+	require.Equal(t, 0, len(comments.Comments))

 	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&url=https://remark42.com/demo-another/")
 	require.Equal(t, http.StatusOK, code)
@@ -388,6 +549,7 @@ func TestMigrator_Remap(t *testing.T) {
 	err = json.Unmarshal([]byte(res), &comments)
 	require.NoError(t, err)
 	require.Equal(t, 0, comments.Info.Count)
+	require.Equal(t, 0, len(comments.Comments))
 }

 func TestMigrator_RemapReject(t *testing.T) {
@@ -15,14 +15,13 @@ import (
 	"sync"
 	"time"

-	"github.com/didip/tollbooth/v7"
-	"github.com/didip/tollbooth_chi"
+	"github.com/didip/tollbooth/v8"
+	"github.com/didip/tollbooth/v8/limiter"
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
 	"github.com/go-chi/cors"
-	"github.com/go-chi/render"
-	"github.com/go-pkgz/auth"
-	"github.com/go-pkgz/lcw"
+	"github.com/go-pkgz/auth/v2"
+	"github.com/go-pkgz/lcw/v2"
 	log "github.com/go-pkgz/lgr"
 	R "github.com/go-pkgz/rest"
 	"github.com/go-pkgz/rest/logger"
@@ -59,26 +58,29 @@ type Rest struct {
 		Low      int
 		Critical int
 	}
-	UpdateLimiter         float64
-	EmailNotifications    bool
-	TelegramNotifications bool
-	EmojiEnabled          bool
-	SimpleView            bool
-	ProxyCORS             bool
-	SendJWTHeader         bool
-	AllowedAncestors      []string // sets Content-Security-Policy "frame-ancestors ..."
-	SubscribersOnly       bool
-	DisableSignature      bool // prevent signature from being added to headers
+	UpdateLimiter              float64
+	EmailNotifications         bool
+	TelegramNotifications      bool
+	EmojiEnabled               bool
+	SimpleView                 bool
+	ProxyCORS                  bool
+	SendJWTHeader              bool
+	AllowedAncestors           []string // sets Content-Security-Policy "frame-ancestors ..."
+	SubscribersOnly            bool
+	DisableSignature           bool // prevent signature from being added to headers
+	DisableFancyTextFormatting bool // disables SmartyPants in the comment text rendering of the posted comments
+	ExternalImageProxy         bool

 	SSLConfig   SSLConfig
 	httpsServer *http.Server
 	httpServer  *http.Server
 	lock        sync.Mutex

-	pubRest   public
-	privRest  private
-	adminRest admin
-	rssRest   rss
+	pubRest          public
+	privRest         private
+	adminRest        admin
+	rssRest          rss
+	openRouteLimiter float64
 }

 // LoadingCache defines interface for caching
@@ -89,12 +91,17 @@ type LoadingCache interface {
 }

 const hardBodyLimit = 1024 * 64 // limit size of body
-
+const openRouteLimiter = 10     // limit for open routes
 const lastCommentsScope = "last"

 type commentsWithInfo struct {
 	Comments []store.Comment `json:"comments"`
-	Info     store.PostInfo  `json:"info,omitempty"`
+	Info     store.PostInfo  `json:"info"`
+}
+
+type treeWithInfo struct {
+	*service.Tree
+	Info store.PostInfo `json:"info"`
 }

 // Run the lister and request's router, activate rest server
@@ -192,8 +199,13 @@ func (s *Rest) makeHTTPServer(address string, port int, router http.Handler) *ht
 }

 func (s *Rest) routes() chi.Router {
+	if s.openRouteLimiter == 0 {
+		// set the default open route limiter. Just a safety measure as it should be set by Run method anyway
+		s.openRouteLimiter = openRouteLimiter
+	}
 	router := chi.NewRouter()
 	router.Use(middleware.Throttle(1000), middleware.RealIP, R.Recoverer(log.Default()))
+	router.Use(securityHeadersMiddleware(s.ExternalImageProxy, s.AllowedAncestors))
 	if !s.DisableSignature {
 		router.Use(R.AppInfo("remark42", "umputun", s.Version))
 	}
@@ -215,11 +227,6 @@ func (s *Rest) routes() chi.Router {
 		router.Use(corsMiddleware.Handler)
 	}

-	if len(s.AllowedAncestors) > 0 {
-		log.Printf("[INFO] allowed from %+v only", s.AllowedAncestors)
-		router.Use(frameAncestors(s.AllowedAncestors))
-	}
-
 	ipFn := func(ip string) string { return store.HashValue(ip, s.SharedSecret)[:12] } // logger uses it for anonymization
 	logInfoWithBody := logger.New(logger.Log(log.Default()), logger.WithBody, logger.IPfn(ipFn), logger.Prefix("[INFO]")).Handler

@@ -227,14 +234,14 @@ func (s *Rest) routes() chi.Router {

 	router.Group(func(r chi.Router) {
 		r.Use(middleware.Timeout(5 * time.Second))
-		r.Use(logInfoWithBody, tollbooth_chi.LimitHandler(tollbooth.NewLimiter(2, nil)), middleware.NoCache)
+		r.Use(logInfoWithBody, rateLimiter(2), middleware.NoCache)
 		r.Use(validEmailAuth()) // reject suspicious email logins
 		r.Mount("/auth", authHandler)
 	})

 	router.Group(func(r chi.Router) {
 		r.Use(middleware.Timeout(5 * time.Second))
-		r.Use(tollbooth_chi.LimitHandler(tollbooth.NewLimiter(100, nil)))
+		r.Use(rateLimiter(100))
 		r.Mount("/avatar", avatarHandler)
 	})

@@ -242,16 +249,17 @@ func (s *Rest) routes() chi.Router {

 	// api routes
 	router.Route("/api/v1", func(rapi chi.Router) {
+		rapi.Use(apiCSPMiddleware)
 		rapi.Group(func(rava chi.Router) {
 			rava.Use(middleware.Timeout(5 * time.Second))
-			rava.Use(tollbooth_chi.LimitHandler(tollbooth.NewLimiter(100, nil)))
+			rava.Use(rateLimiter(100))
 			rava.Mount("/avatar", avatarHandler)
 		})

 		// open routes
 		rapi.Group(func(ropen chi.Router) {
 			ropen.Use(middleware.Timeout(30 * time.Second))
-			ropen.Use(tollbooth_chi.LimitHandler(tollbooth.NewLimiter(10, nil)))
+			ropen.Use(rateLimiter(s.openRouteLimiter))
 			ropen.Use(authMiddleware.Trace, middleware.NoCache, logInfoWithBody)
 			ropen.Get("/config", s.configCtrl)
 			ropen.Get("/find", s.pubRest.findCommentsCtrl)
@@ -262,7 +270,6 @@ func (s *Rest) routes() chi.Router {
 			ropen.Post("/counts", s.pubRest.countMultiCtrl)
 			ropen.Get("/list", s.pubRest.listCtrl)
 			ropen.Get("/info", s.pubRest.infoCtrl)
-			ropen.Get("/img", s.ImageProxy.Handler)

 			ropen.Route("/rss", func(rrss chi.Router) {
 				rrss.Get("/post", s.rssRest.postCommentsCtrl)
@@ -271,11 +278,17 @@ func (s *Rest) routes() chi.Router {
 			})
 		})

-		// open routes, cached
+		// open routes, cached. /img lives here (not in the NoCache group above) because
+		// middleware.NoCache strips If-None-Match from incoming requests, which would
+		// defeat the proxy handler's 304 short-circuit. The handler sets a 30-day
+		// max-age on validated success responses (with a versioned etag for cache
+		// invalidation on revalidation); error responses get Cache-Control: no-store
+		// so transient failures aren't pinned in the cache.
 		rapi.Group(func(ropen chi.Router) {
 			ropen.Use(middleware.Timeout(30 * time.Second))
-			ropen.Use(tollbooth_chi.LimitHandler(tollbooth.NewLimiter(10, nil)))
+			ropen.Use(rateLimiter(10))
 			ropen.Use(authMiddleware.Trace, logInfoWithBody)
+			ropen.Get("/img", s.ImageProxy.Handler)
 			ropen.Get("/picture/{user}/{id}", s.pubRest.loadPictureCtrl)
 			ropen.Get("/qr/telegram", s.pubRest.telegramQrCtrl)
 		})
@@ -283,7 +296,7 @@ func (s *Rest) routes() chi.Router {
 		// protected routes, require auth
 		rapi.Group(func(rauth chi.Router) {
 			rauth.Use(middleware.Timeout(30 * time.Second))
-			rauth.Use(tollbooth_chi.LimitHandler(tollbooth.NewLimiter(10, nil)))
+			rauth.Use(rateLimiter(10))
 			rauth.Use(authMiddleware.Auth, matchSiteID, middleware.NoCache, logInfoWithBody)
 			rauth.Get("/user", s.privRest.userInfoCtrl)
 			rauth.Get("/userdata", s.privRest.userAllDataCtrl)
@@ -292,7 +305,7 @@ func (s *Rest) routes() chi.Router {
 		// admin routes, require auth and admin users only
 		rapi.Route("/admin", func(radmin chi.Router) {
 			radmin.Use(middleware.Timeout(30 * time.Second))
-			radmin.Use(tollbooth_chi.LimitHandler(tollbooth.NewLimiter(10, nil)))
+			radmin.Use(rateLimiter(10))
 			radmin.Use(authMiddleware.Auth, authMiddleware.AdminOnly, matchSiteID)
 			radmin.Use(middleware.NoCache, logInfoWithBody)

@@ -318,7 +331,7 @@ func (s *Rest) routes() chi.Router {
 		// protected routes, throttled to 10/s by default, controlled by external UpdateLimiter param
 		rapi.Group(func(rauth chi.Router) {
 			rauth.Use(middleware.Timeout(10 * time.Second))
-			rauth.Use(tollbooth_chi.LimitHandler(tollbooth.NewLimiter(s.updateLimiter(), nil)))
+			rauth.Use(rateLimiter(s.updateLimiter()))
 			rauth.Use(authMiddleware.Auth, matchSiteID, subscribersOnly(s.SubscribersOnly))
 			rauth.Use(middleware.NoCache, logInfoWithBody)

@@ -338,7 +351,7 @@ func (s *Rest) routes() chi.Router {
 		// protected routes, anonymous rejected
 		rapi.Group(func(rauth chi.Router) {
 			rauth.Use(middleware.Timeout(10 * time.Second))
-			rauth.Use(tollbooth_chi.LimitHandler(tollbooth.NewLimiter(s.updateLimiter(), nil)))
+			rauth.Use(rateLimiter(s.updateLimiter()))
 			rauth.Use(authMiddleware.Auth, rejectAnonUser, matchSiteID)
 			rauth.Use(logger.New(logger.Log(log.Default()), logger.Prefix("[DEBUG]"), logger.IPfn(ipFn)).Handler)
 			rauth.Post("/picture", s.privRest.savePictureCtrl)
@@ -348,7 +361,7 @@ func (s *Rest) routes() chi.Router {
 	// open routes on root level
 	router.Group(func(rroot chi.Router) {
 		rroot.Use(middleware.Timeout(10 * time.Second))
-		rroot.Use(tollbooth_chi.LimitHandler(tollbooth.NewLimiter(50, nil)))
+		rroot.Use(rateLimiter(50))
 		rroot.Get("/robots.txt", s.pubRest.robotsCtrl)
 		rroot.Get("/email/unsubscribe.html", s.privRest.emailUnsubscribeCtrl)
 		rroot.Post("/email/unsubscribe.html", s.privRest.emailUnsubscribeCtrl)
@@ -369,16 +382,17 @@ func (s *Rest) controllerGroups() (public, private, admin, rss) {
 	}

 	privGrp := private{
-		dataService:      s.DataService,
-		cache:            s.Cache,
-		imageService:     s.ImageService,
-		commentFormatter: s.CommentFormatter,
-		readOnlyAge:      s.ReadOnlyAge,
-		authenticator:    s.Authenticator,
-		notifyService:    s.NotifyService,
-		telegramService:  s.TelegramService,
-		remarkURL:        s.RemarkURL,
-		anonVote:         s.AnonVote,
+		dataService:                s.DataService,
+		cache:                      s.Cache,
+		imageService:               s.ImageService,
+		commentFormatter:           s.CommentFormatter,
+		readOnlyAge:                s.ReadOnlyAge,
+		authenticator:              s.Authenticator,
+		notifyService:              s.NotifyService,
+		telegramService:            s.TelegramService,
+		remarkURL:                  s.RemarkURL,
+		anonVote:                   s.AnonVote,
+		disableFancyTextFormatting: s.DisableFancyTextFormatting,
 	}

 	admGrp := admin{
@@ -417,6 +431,7 @@ func (s *Rest) configCtrl(w http.ResponseWriter, r *http.Request) {
 		Version               string   `json:"version"`
 		EditDuration          int      `json:"edit_duration"`
 		AdminEdit             bool     `json:"admin_edit"`
+		MinCommentSize        int      `json:"min_comment_size"`
 		MaxCommentSize        int      `json:"max_comment_size"`
 		Admins                []string `json:"admins"`
 		AdminEmail            string   `json:"admin_email"`
@@ -437,6 +452,7 @@ func (s *Rest) configCtrl(w http.ResponseWriter, r *http.Request) {
 		Version:               s.Version,
 		EditDuration:          int(s.DataService.EditDuration.Seconds()),
 		AdminEdit:             s.DataService.AdminEdits,
+		MinCommentSize:        s.DataService.MinCommentSize,
 		MaxCommentSize:        s.DataService.MaxCommentSize,
 		Admins:                admins,
 		AdminEmail:            emails,
@@ -462,8 +478,7 @@ func (s *Rest) configCtrl(w http.ResponseWriter, r *http.Request) {
 	if cnf.Admins == nil { // prevent json serialization to nil
 		cnf.Admins = []string{}
 	}
-	render.Status(r, http.StatusOK)
-	render.JSON(w, r, cnf)
+	R.RenderJSON(w, cnf)
 }

 // serves static files from the webRoot directory or files embedded into the compiled binary if that directory is absent
@@ -482,7 +497,7 @@ func addFileServer(r chi.Router, embedFS embed.FS, webRoot, version string) {
 	webFS = http.StripPrefix("/web", webFS)
 	r.Get("/web", http.RedirectHandler("/web/", http.StatusMovedPermanently).ServeHTTP)

-	r.With(tollbooth_chi.LimitHandler(tollbooth.NewLimiter(20, nil)),
+	r.With(rateLimiter(20),
 		middleware.Timeout(10*time.Second),
 		cacheControl(time.Hour, version),
 	).Get("/web/*", func(w http.ResponseWriter, r *http.Request) {
@@ -495,7 +510,7 @@ func addFileServer(r chi.Router, embedFS embed.FS, webRoot, version string) {
 	})
 }

-func encodeJSONWithHTML(v interface{}) ([]byte, error) {
+func encodeJSONWithHTML(v any) ([]byte, error) {
 	buf := &bytes.Buffer{}
 	enc := json.NewEncoder(buf)
 	enc.SetEscapeHTML(false)
@@ -575,7 +590,9 @@ func matchSiteID(next http.Handler) http.Handler {
 		}

 		siteID := r.URL.Query().Get("site")
-		if siteID != "" && user.SiteID != siteID {
+		// require an explicit site so the user.SiteID check below cannot be bypassed
+		// by simply omitting the query parameter
+		if siteID == "" || user.SiteID != siteID {
 			http.Error(w, "Access denied", http.StatusForbidden)
 			return
 		}
@@ -609,19 +626,52 @@ func cacheControl(expiration time.Duration, version string) func(http.Handler) h
 	}
 }

-// frameAncestors is a middleware setting Content-Security-Policy "frame-ancestors host1 host2 ..."
-// prevents loading of comments widgets from any other origins. In case if the list of allowed empty, ignored.
-func frameAncestors(hosts []string) func(http.Handler) http.Handler {
-	return func(h http.Handler) http.Handler {
-		fn := func(w http.ResponseWriter, r *http.Request) {
-			if len(hosts) == 0 {
-				h.ServeHTTP(w, r)
-				return
+// apiCSPMiddleware overrides the global Content-Security-Policy on /api/v1 routes
+// with a strict, default-deny policy. The global CSP (securityHeadersMiddleware) keeps
+// 'self' 'unsafe-inline' for script-src/style-src because the widget HTML pages
+// (/web/*.html) need inline bootstrap blocks. API responses serve JSON, XML/RSS, or
+// images — none of those should ever execute scripts when rendered, so they get the
+// strictest policy available as defense-in-depth against future trust-boundary bugs.
+//
+// Image-serving handlers (/api/v1/img, /api/v1/picture/{user}/{id}) re-apply the same
+// rest.StrictImageCSP value at the handler level and additionally set Content-Disposition:
+// inline; filename="image" (framing the response as a file rather than a renderable
+// document) and X-Content-Type-Options: nosniff. The CSP re-apply is intentional belt-and-
+// braces: if a future route refactor bypasses this middleware, the image handlers still
+// emit the policy.
+func apiCSPMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Security-Policy", rest.StrictImageCSP)
+		next.ServeHTTP(w, r)
+	})
+}
+
+// securityHeadersMiddleware sets security-related headers:
+//   - Content-Security-Policy: controls which resources the browser is allowed to load
+//   - Permissions-Policy: disables browser features (camera, mic, etc.) not needed by a comment widget
+//   - X-Content-Type-Options: prevents browsers from MIME-sniffing responses away from the declared type,
+//     stopping e.g. a user-uploaded image from being reinterpreted as executable HTML/JS
+//   - Referrer-Policy: controls how much URL information leaks in the Referer header on cross-origin
+//     requests; "strict-origin-when-cross-origin" sends only the origin (no path) to other domains
+//     and nothing at all on HTTPS→HTTP downgrades
+func securityHeadersMiddleware(imageProxyEnabled bool, allowedAncestors []string) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			imgSrc := "*"
+			if imageProxyEnabled {
+				imgSrc = "'self'"
 			}
-			w.Header().Set("Content-Security-Policy", "frame-ancestors "+strings.Join(hosts, " ")+";")
-			h.ServeHTTP(w, r)
-		}
-		return http.HandlerFunc(fn)
+			frameAncestors := "*"
+			if len(allowedAncestors) > 0 {
+				frameAncestors = strings.Join(allowedAncestors, " ")
+			}
+			// font-src is set to 'none' (no @font-face / no base64 fonts in the bundle).
+			w.Header().Set("Content-Security-Policy", fmt.Sprintf("default-src 'none'; base-uri 'none'; form-action 'none'; connect-src 'self'; frame-src 'self' mailto:; img-src %s; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; font-src 'none'; object-src 'none'; frame-ancestors %s;", imgSrc, frameAncestors))
+			w.Header().Set("Permissions-Policy", "accelerometer=(), autoplay=(), camera=(), cross-origin-isolated=(), display-capture=(), encrypted-media=(), fullscreen=(), geolocation=(), gyroscope=(), keyboard-map=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), publickey-credentials-get=(), screen-wake-lock=(), sync-xhr=(), usb=(), xr-spatial-tracking=(), clipboard-read=(), clipboard-write=(), gamepad=(), hid=(), idle-detection=(), interest-cohort=(), serial=(), unload=(), window-management=()")
+			w.Header().Set("X-Content-Type-Options", "nosniff")
+			w.Header().Set("Referrer-Policy", "strict-origin-when-cross-origin")
+			next.ServeHTTP(w, r)
+		})
 	}
 }

@@ -715,3 +765,16 @@ func parseError(err error, defaultCode int) (code int) {

 	return code
 }
+
+// rateLimiter creates a rate limiting middleware with proper IP lookup configuration.
+// tollbooth v8 requires explicit IP lookup method to be set.
+// uses RemoteAddr which is set by chi's middleware.RealIP to the real client IP
+// from X-Forwarded-For, X-Real-IP, or True-Client-IP headers.
+func rateLimiter(maxReq float64) func(http.Handler) http.Handler {
+	lmt := tollbooth.NewLimiter(maxReq, nil)
+	lmt.SetIPLookup(limiter.IPLookup{
+		Name:           "RemoteAddr",
+		IndexFromRight: 0,
+	})
+	return tollbooth.HTTPMiddleware(lmt)
+}
@@ -6,21 +6,22 @@ import (
 	"crypto/rand"
 	"crypto/sha1" //nolint:gosec //not used for security
 	"encoding/json"
+	"errors"
 	"fmt"
 	"html/template"
 	"io"
+	"net"
 	"net/http"
 	"strings"
 	"time"

 	"github.com/go-chi/chi/v5"
-	"github.com/go-chi/render"
-	"github.com/go-pkgz/auth"
-	"github.com/go-pkgz/auth/token"
-	cache "github.com/go-pkgz/lcw"
+	"github.com/go-pkgz/auth/v2"
+	"github.com/go-pkgz/auth/v2/token"
+	cache "github.com/go-pkgz/lcw/v2"
 	log "github.com/go-pkgz/lgr"
 	R "github.com/go-pkgz/rest"
-	"github.com/golang-jwt/jwt"
+	"github.com/golang-jwt/jwt/v5"
 	"github.com/hashicorp/go-multierror"

 	"github.com/umputun/remark42/backend/app/notify"
@@ -33,16 +34,17 @@ import (
 )

 type private struct {
-	dataService      privStore
-	cache            LoadingCache
-	readOnlyAge      int
-	commentFormatter *store.CommentFormatter
-	imageService     *image.Service
-	notifyService    *notify.Service
-	authenticator    *auth.Service
-	telegramService  telegramService
-	remarkURL        string
-	anonVote         bool
+	dataService                privStore
+	cache                      LoadingCache
+	readOnlyAge                int
+	commentFormatter           *store.CommentFormatter
+	imageService               *image.Service
+	notifyService              *notify.Service
+	authenticator              *auth.Service
+	telegramService            telegramService
+	remarkURL                  string
+	anonVote                   bool
+	disableFancyTextFormatting bool // disables SmartyPants in the comment text rendering of the posted comments
 }

 // telegramService is a subset of Telegram service used for setting up user telegram notifications
@@ -75,7 +77,7 @@ func (s *private) previewCommentCtrl(w http.ResponseWriter, r *http.Request) {
 	user := rest.MustGetUserInfo(r)

 	comment := store.Comment{}
-	if err := render.DecodeJSON(http.MaxBytesReader(w, r.Body, hardBodyLimit), &comment); err != nil {
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, hardBodyLimit)).Decode(&comment); err != nil {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't bind comment", rest.ErrDecode)
 		return
 	}
@@ -87,7 +89,7 @@ func (s *private) previewCommentCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}

-	comment = s.commentFormatter.Format(comment)
+	comment = s.commentFormatter.Format(comment, s.disableFancyTextFormatting)
 	comment.Sanitize()

 	// check if images are valid, omit proxied images as they are lazy-loaded
@@ -98,14 +100,13 @@ func (s *private) previewCommentCtrl(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	}
-
-	render.HTML(w, r, comment.Text)
+	rest.HTMLResponse(w, http.StatusOK, comment.Text)
 }

 // POST /comment - adds comment, resets all immutable fields
 func (s *private) createCommentCtrl(w http.ResponseWriter, r *http.Request) {
 	comment := store.Comment{}
-	if err := render.DecodeJSON(http.MaxBytesReader(w, r.Body, hardBodyLimit), &comment); err != nil {
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, hardBodyLimit)).Decode(&comment); err != nil {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't bind comment", rest.ErrDecode)
 		return
 	}
@@ -120,14 +121,14 @@ func (s *private) createCommentCtrl(w http.ResponseWriter, r *http.Request) {

 	comment.PrepareUntrusted() // clean all fields user not supposed to set
 	comment.User = user
-	comment.User.IP = strings.Split(r.RemoteAddr, ":")[0]
+	comment.User.IP = extractIP(r.RemoteAddr)

 	comment.Orig = comment.Text // original comment text, prior to md render
 	if err := s.dataService.ValidateComment(&comment); err != nil {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "invalid comment", rest.ErrCommentValidation)
 		return
 	}
-	comment = s.commentFormatter.Format(comment)
+	comment = s.commentFormatter.Format(comment, s.disableFancyTextFormatting)

 	// check if images are valid, omit proxied images as they are lazy-loaded
 	for _, id := range s.imageService.ExtractNonProxiedPictures(comment.Text) {
@@ -150,7 +151,7 @@ func (s *private) createCommentCtrl(w http.ResponseWriter, r *http.Request) {
 	}

 	id, err := s.dataService.Create(comment)
-	if err == service.ErrRestrictedWordsFound {
+	if errors.Is(err, service.ErrRestrictedWordsFound) {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "invalid comment", rest.ErrCommentRestrictWords)
 		return
 	}
@@ -174,8 +175,7 @@ func (s *private) createCommentCtrl(w http.ResponseWriter, r *http.Request) {

 	log.Printf("[DEBUG] created comment %+v", finalComment)

-	render.Status(r, http.StatusCreated)
-	render.JSON(w, r, &finalComment)
+	_ = R.EncodeJSON(w, http.StatusCreated, &finalComment)
 }

 // PUT /comment/{id}?site=siteID&url=post-url - update comment
@@ -186,7 +186,7 @@ func (s *private) updateCommentCtrl(w http.ResponseWriter, r *http.Request) {
 		Delete  bool
 	}{}

-	if err := render.DecodeJSON(http.MaxBytesReader(w, r.Body, hardBodyLimit), &edit); err != nil {
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, hardBodyLimit)).Decode(&edit); err != nil {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't read comment details from body", rest.ErrDecode)
 		return
 	}
@@ -211,7 +211,7 @@ func (s *private) updateCommentCtrl(w http.ResponseWriter, r *http.Request) {
 	}

 	editReq := service.EditRequest{
-		Text:    s.commentFormatter.FormatText(edit.Text),
+		Text:    s.commentFormatter.FormatText(edit.Text, s.disableFancyTextFormatting),
 		Orig:    edit.Text,
 		Summary: edit.Summary,
 		Delete:  edit.Delete,
@@ -219,7 +219,7 @@ func (s *private) updateCommentCtrl(w http.ResponseWriter, r *http.Request) {
 	}

 	res, err := s.dataService.EditComment(locator, id, editReq)
-	if err == service.ErrRestrictedWordsFound {
+	if errors.Is(err, service.ErrRestrictedWordsFound) {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "invalid comment", rest.ErrCommentValidation)
 		return
 	}
@@ -231,7 +231,7 @@ func (s *private) updateCommentCtrl(w http.ResponseWriter, r *http.Request) {
 	}

 	s.cache.Flush(cache.Flusher(locator.SiteID).Scopes(locator.SiteID, locator.URL, lastCommentsScope, user.ID))
-	render.JSON(w, r, res)
+	R.RenderJSON(w, res)
 }

 // GET /user?site=siteID - returns user info
@@ -244,12 +244,12 @@ func (s *private) userInfoCtrl(w http.ResponseWriter, r *http.Request) {
 		if err != nil {
 			log.Printf("[WARN] can't read email for %s, %v", user.ID, err)
 		}
-		if len(email) > 0 {
+		if email != "" {
 			user.EmailSubscription = true
 		}
 	}

-	render.JSON(w, r, user)
+	R.RenderJSON(w, user)
 }

 // PUT /vote/{id}?site=siteID&url=post-url&vote=1 - vote for/against comment
@@ -280,7 +280,7 @@ func (s *private) voteCtrl(w http.ResponseWriter, r *http.Request) {
 		Locator:   locator,
 		CommentID: id,
 		UserID:    user.ID,
-		UserIP:    strings.Split(r.RemoteAddr, ":")[0],
+		UserIP:    extractIP(r.RemoteAddr),
 		Val:       vote,
 	}
 	comment, err := s.dataService.Vote(req)
@@ -290,7 +290,7 @@ func (s *private) voteCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	s.cache.Flush(cache.Flusher(locator.SiteID).Scopes(locator.URL, comment.User.ID))
-	render.JSON(w, r, R.JSON{"id": comment.ID, "score": comment.Score})
+	R.RenderJSON(w, R.JSON{"id": comment.ID, "score": comment.Score})
 }

 // getEmailCtrl gets email address for authenticated user.
@@ -303,7 +303,7 @@ func (s *private) getEmailCtrl(w http.ResponseWriter, r *http.Request) {
 		log.Printf("[WARN] can't read email for %s, %v", user.ID, err)
 	}

-	render.JSON(w, r, R.JSON{"user": user, "address": address})
+	R.RenderJSON(w, R.JSON{"user": user, "address": address})
 }

 // sendEmailConfirmationCtrl gets address and siteID from query, makes confirmation token and sends it to user.
@@ -320,7 +320,7 @@ func (s *private) sendEmailConfirmationCtrl(w http.ResponseWriter, r *http.Reque
 		Address     string
 		autoConfirm bool
 	}{autoConfirm: true}
-	if err := render.DecodeJSON(http.MaxBytesReader(w, r.Body, hardBodyLimit), &subscribe); err != nil {
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, hardBodyLimit)).Decode(&subscribe); err != nil {
 		if err != io.EOF {
 			rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't parse request body", rest.ErrDecode)
 			return
@@ -360,10 +360,10 @@ func (s *private) sendEmailConfirmationCtrl(w http.ResponseWriter, r *http.Reque

 	claims := token.Claims{
 		Handshake: &token.Handshake{ID: user.ID + "::" + subscribe.Address},
-		StandardClaims: jwt.StandardClaims{
-			Audience:  r.URL.Query().Get("site"),
-			ExpiresAt: time.Now().Add(30 * time.Minute).Unix(),
-			NotBefore: time.Now().Add(-1 * time.Minute).Unix(),
+		RegisteredClaims: jwt.RegisteredClaims{
+			Audience:  jwt.ClaimStrings{r.URL.Query().Get("site")},
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(30 * time.Minute)),
+			NotBefore: jwt.NewNumericDate(time.Now().Add(-1 * time.Minute)),
 			Issuer:    "remark42",
 		},
 	}
@@ -383,7 +383,7 @@ func (s *private) sendEmailConfirmationCtrl(w http.ResponseWriter, r *http.Reque
 		},
 	)

-	render.JSON(w, r, R.JSON{"user": user, "address": subscribe.Address, "updated": false})
+	R.RenderJSON(w, R.JSON{"user": user, "address": subscribe.Address, "updated": false})
 }

 // telegramSubscribeCtrl generates and verifies telegram notification request
@@ -411,7 +411,7 @@ func (s *private) telegramSubscribeCtrl(w http.ResponseWriter, r *http.Request)
 				fmt.Errorf("already subscribed"), "telegram subscription is already set for this user, delete if first to re-subscribe", rest.ErrActionRejected)
 			return
 		}
-		// Generate and send token
+		// generate and send token
 		tkn, err := randToken()
 		if err != nil {
 			rest.SendErrorJSON(w, r, http.StatusForbidden, err, "failed to generate verification token", rest.ErrInternal)
@@ -421,7 +421,7 @@ func (s *private) telegramSubscribeCtrl(w http.ResponseWriter, r *http.Request)

 		s.telegramService.AddToken(tkn, user.ID, siteID, expires)

-		render.JSON(w, r, R.JSON{"token": tkn, "bot": s.telegramService.GetBotUsername()})
+		R.RenderJSON(w, R.JSON{"token": tkn, "bot": s.telegramService.GetBotUsername()})

 		return
 	}
@@ -443,7 +443,7 @@ func (s *private) telegramSubscribeCtrl(w http.ResponseWriter, r *http.Request)
 		return
 	}

-	render.JSON(w, r, R.JSON{"updated": true, "address": val})
+	R.RenderJSON(w, R.JSON{"updated": true, "address": val})
 }

 // setConfirmedEmailCtrl uses provided token parameter (generated by sendEmailConfirmationCtrl) to set email and add it to user token
@@ -455,7 +455,7 @@ func (s *private) setConfirmedEmailCtrl(w http.ResponseWriter, r *http.Request)
 		Site  string
 		Token string
 	}{}
-	if err := render.DecodeJSON(http.MaxBytesReader(w, r.Body, hardBodyLimit), &confirm); err != nil {
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, hardBodyLimit)).Decode(&confirm); err != nil {
 		if err != io.EOF {
 			rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't parse request body", rest.ErrDecode)
 			return
@@ -480,7 +480,7 @@ func (s *private) setConfirmedEmailCtrl(w http.ResponseWriter, r *http.Request)
 		return
 	}

-	// Handshake.ID is user.ID + "::" + address
+	// handshake.ID is user.ID + "::" + address
 	elems := strings.Split(confClaims.Handshake.ID, "::")
 	if len(elems) != 2 || elems[0] != user.ID {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, fmt.Errorf("%s", confClaims.Handshake.ID), "invalid handshake token", rest.ErrInternal)
@@ -511,7 +511,7 @@ func (s *private) setEmail(w http.ResponseWriter, r *http.Request, userID, siteI
 		rest.SendErrorJSON(w, r, http.StatusInternalServerError, err, "failed to set token", rest.ErrInternal)
 		return
 	}
-	render.JSON(w, r, R.JSON{"updated": true, "address": val})
+	R.RenderJSON(w, R.JSON{"updated": true, "address": val})
 }

 // POST/GET /email/unsubscribe.html?site=siteID&tkn=jwt - unsubscribe the user in token from email notifications
@@ -534,7 +534,7 @@ func (s *private) emailUnsubscribeCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}

-	// Handshake.ID is user.ID + "::" + address
+	// handshake.ID is user.ID + "::" + address
 	elems := strings.Split(confClaims.Handshake.ID, "::")
 	if len(elems) != 2 {
 		rest.SendErrorHTML(w, r, http.StatusBadRequest, fmt.Errorf("%s", confClaims.Handshake.ID), "invalid handshake token", rest.ErrInternal)
@@ -579,7 +579,7 @@ func (s *private) emailUnsubscribeCtrl(w http.ResponseWriter, r *http.Request) {
 	}

 	// MustExecute behaves like template.Execute, but panics if an error occurs.
-	MustExecute := func(tmpl *template.Template, wr io.Writer, data interface{}) {
+	MustExecute := func(tmpl *template.Template, wr io.Writer, data any) {
 		if err := tmpl.Execute(wr, data); err != nil {
 			panic(err)
 		}
@@ -595,7 +595,7 @@ func (s *private) emailUnsubscribeCtrl(w http.ResponseWriter, r *http.Request) {
 	tmpl := template.Must(template.New("unsubscribe").Parse(tmplstr))
 	msg := bytes.Buffer{}
 	MustExecute(tmpl, &msg, nil)
-	render.HTML(w, r, msg.String())
+	rest.HTMLResponse(w, http.StatusOK, msg.String())
 }

 // DELETE /email?site=siteID - removes user's email
@@ -622,7 +622,7 @@ func (s *private) deleteEmailCtrl(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	}
-	render.JSON(w, r, R.JSON{"deleted": true})
+	R.RenderJSON(w, R.JSON{"deleted": true})
 }

 // DELETE /telegram?site=siteID - removes user's telegram
@@ -636,7 +636,7 @@ func (s *private) deleteTelegramCtrl(w http.ResponseWriter, r *http.Request) {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't delete telegram for user", code)
 		return
 	}
-	render.JSON(w, r, R.JSON{"deleted": true})
+	R.RenderJSON(w, R.JSON{"deleted": true})
 }

 // GET /userdata?site=siteID - exports all data about the user as a json with user info and list of all comments
@@ -670,7 +670,7 @@ func (s *private) userAllDataCtrl(w http.ResponseWriter, r *http.Request) {
 	merr = multierror.Append(merr, write([]byte(`, "comments":`))) // send comments prefix

 	// get comments in 100 in each paginated request
-	for i := 0; i < 100; i++ {
+	for i := range 100 {
 		comments, errUser := s.dataService.User(siteID, user.ID, 100, i*100, rest.GetUserOrEmpty(r))
 		if errUser != nil {
 			rest.SendErrorJSON(w, r, http.StatusInternalServerError, errUser, "can't get user comments", rest.ErrInternal)
@@ -702,16 +702,16 @@ func (s *private) deleteMeCtrl(w http.ResponseWriter, r *http.Request) {
 	siteID := r.URL.Query().Get("site")

 	claims := token.Claims{
-		StandardClaims: jwt.StandardClaims{
-			Audience:  siteID,
+		RegisteredClaims: jwt.RegisteredClaims{
+			Audience:  jwt.ClaimStrings{siteID},
 			Issuer:    "remark42",
-			ExpiresAt: time.Now().AddDate(0, 3, 0).Unix(),
-			NotBefore: time.Now().Add(-1 * time.Minute).Unix(),
+			ExpiresAt: jwt.NewNumericDate(time.Now().AddDate(0, 3, 0)),
+			NotBefore: jwt.NewNumericDate(time.Now().Add(-1 * time.Minute)),
 		},
 		User: &token.User{
 			ID:   user.ID,
 			Name: user.Name,
-			Attributes: map[string]interface{}{
+			Attributes: map[string]any{
 				"delete_me": true, // prevents this token from being used for login
 			},
 		},
@@ -724,14 +724,18 @@ func (s *private) deleteMeCtrl(w http.ResponseWriter, r *http.Request) {
 	}

 	link := fmt.Sprintf("%s/web/deleteme.html?token=%s", s.remarkURL, tokenStr)
-	render.JSON(w, r, R.JSON{"site": siteID, "user_id": user.ID, "token": tokenStr, "link": link})
+	R.RenderJSON(w, R.JSON{"site": siteID, "user_id": user.ID, "token": tokenStr, "link": link})
 }

 // POST /image - save image with form request
 func (s *private) savePictureCtrl(w http.ResponseWriter, r *http.Request) {
 	user := rest.MustGetUserInfo(r)

-	if err := r.ParseMultipartForm(5 * 1024 * 1024); err != nil { // 5M max memory, if bigger will make a file
+	r.Body = http.MaxBytesReader(w, r.Body, 32*1024*1024) // hard cap on upload to prevent memory exhaustion
+	// gosec G120: r.Body is already bounded by MaxBytesReader on the line above (32 MB),
+	// so ParseMultipartForm cannot read more than that regardless of the in-memory threshold.
+	// The 5 MB argument is the soft threshold above which the form is spilled to disk.
+	if err := r.ParseMultipartForm(5 * 1024 * 1024); err != nil { //nolint:gosec // bounded by MaxBytesReader above
 		rest.SendErrorJSON(w, r, http.StatusInternalServerError, err, "can't parse multipart form", rest.ErrDecode)
 		return
 	}
@@ -749,7 +753,7 @@ func (s *private) savePictureCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}

-	render.JSON(w, r, R.JSON{"id": id})
+	R.RenderJSON(w, R.JSON{"id": id})
 }

 func (s *private) isReadOnly(locator store.Locator) bool {
@@ -773,3 +777,13 @@ func randToken() (string, error) {
 	}
 	return fmt.Sprintf("%x", s.Sum(nil)), nil
 }
+
+// extractIP returns the IP portion of the remote address, handling both IPv4 and IPv6 formats.
+// supports "ip:port", "[ip]:port", and bare "ip" formats.
+func extractIP(remoteAddr string) string {
+	ip, _, err := net.SplitHostPort(remoteAddr)
+	if err != nil {
+		return remoteAddr // already a bare IP (no port)
+	}
+	return ip
+}
@@ -16,11 +16,10 @@ import (
 	"testing"
 	"time"

-	"github.com/go-chi/render"
-	"github.com/go-pkgz/auth/token"
+	"github.com/go-pkgz/auth/v2/token"
 	"github.com/go-pkgz/lgr"
 	R "github.com/go-pkgz/rest"
-	"github.com/golang-jwt/jwt"
+	"github.com/golang-jwt/jwt/v5"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"

@@ -39,7 +38,7 @@ func TestRest_Create(t *testing.T) {
 	ts, _, teardown := startupT(t)
 	defer teardown()

-	resp, err := post(t, ts.URL+"/api/v1/comment",
+	resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42",
 		`{"text": "test 123", "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`)
 	assert.NoError(t, err)
 	b, err := io.ReadAll(resp.Body)
@@ -50,7 +49,7 @@ func TestRest_Create(t *testing.T) {
 	c := R.JSON{}
 	err = json.Unmarshal(b, &c)
 	assert.NoError(t, err)
-	loc := c["locator"].(map[string]interface{})
+	loc := c["locator"].(map[string]any)
 	assert.Equal(t, "remark42", loc["site"])
 	assert.Equal(t, "https://radio-t.com/blah1", loc["url"])
 	assert.True(t, len(c["id"].(string)) > 8)
@@ -61,7 +60,7 @@ func TestRest_CreateFilteredCode(t *testing.T) {
 	ts, _, teardown := startupT(t)
 	defer teardown()

-	resp, err := post(t, ts.URL+"/api/v1/comment",
+	resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42",
 		`{"text": "`+"`foo<bar>`"+`", "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`)
 	assert.NoError(t, err)
 	b, err := io.ReadAll(resp.Body)
@@ -72,7 +71,7 @@ func TestRest_CreateFilteredCode(t *testing.T) {
 	c := R.JSON{}
 	err = json.Unmarshal(b, &c)
 	require.NoError(t, err, string(b))
-	loc := c["locator"].(map[string]interface{})
+	loc := c["locator"].(map[string]any)
 	assert.Equal(t, "remark42", loc["site"])
 	assert.Equal(t, "https://radio-t.com/blah1", loc["url"])
 	assert.Equal(t, "`foo<bar>`", c["orig"])
@@ -94,6 +93,7 @@ func TestRest_CreateAndPreviewWithImage(t *testing.T) {
 		RoutePath:     "/api/v1/img",
 		RemarkURL:     srv.RemarkURL,
 		ImageService:  srv.ImageService,
+		Transport:     http.DefaultTransport,
 	}
 	srv.CommentFormatter = store.NewCommentFormatter(srv.ImageProxy)
 	// need to recreate the server with new ImageProxy, otherwise old one will be used
@@ -102,7 +102,7 @@ func TestRest_CreateAndPreviewWithImage(t *testing.T) {

 	var pngRead bool
 	// server with the test PNG image
-	pngServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	pngServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
 		_, e := io.Copy(w, gopherPNG())
 		assert.NoError(t, e)
 		pngRead = true
@@ -110,7 +110,7 @@ func TestRest_CreateAndPreviewWithImage(t *testing.T) {
 	defer pngServer.Close()

 	t.Run("create", func(t *testing.T) {
-		resp, err := post(t, ts.URL+"/api/v1/comment",
+		resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42",
 			`{"text": "![](`+pngServer.URL+`/gopher.png)", "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`)
 		assert.NoError(t, err)
 		b, err := io.ReadAll(resp.Body)
@@ -123,7 +123,7 @@ func TestRest_CreateAndPreviewWithImage(t *testing.T) {
 		require.NoError(t, err, string(b))
 		assert.NotContains(t, c["text"], pngServer.URL)
 		assert.Contains(t, c["text"], srv.RemarkURL)
-		loc := c["locator"].(map[string]interface{})
+		loc := c["locator"].(map[string]any)
 		assert.Equal(t, "remark42", loc["site"])
 		assert.Equal(t, "https://radio-t.com/blah1", loc["url"])
 		assert.True(t, len(c["id"].(string)) > 8)
@@ -176,7 +176,7 @@ func TestRest_CreateOldPost(t *testing.T) {
 	assert.Equal(t, 1, len(comments))

 	// try to add new comment to the same old post
-	resp, err := post(t, ts.URL+"/api/v1/comment",
+	resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42",
 		`{"text": "test 123", "locator":{"site": "remark42","url": "https://radio-t.com/blah1"}}`)
 	assert.NoError(t, err)
 	assert.NoError(t, resp.Body.Close())
@@ -189,7 +189,7 @@ func TestRest_CreateOldPost(t *testing.T) {
 	_, err = srv.DataService.Create(old)
 	assert.NoError(t, err)

-	resp, err = post(t, ts.URL+"/api/v1/comment",
+	resp, err = post(t, ts.URL+"/api/v1/comment?site=remark42",
 		`{"text": "test 123", "locator":{"site": "remark42","url": "https://radio-t.com/blah1"}}`)
 	assert.NoError(t, err)
 	assert.NoError(t, resp.Body.Close())
@@ -202,7 +202,7 @@ func TestRest_CreateTooBig(t *testing.T) {

 	longComment := fmt.Sprintf(`{"text": "%4001s", "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`, "Щ")

-	resp, err := post(t, ts.URL+"/api/v1/comment", longComment)
+	resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42", longComment)
 	assert.NoError(t, err)
 	assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
 	b, err := io.ReadAll(resp.Body)
@@ -215,7 +215,7 @@ func TestRest_CreateTooBig(t *testing.T) {
 	assert.Equal(t, "invalid comment", c["details"])

 	veryLongComment := fmt.Sprintf(`{"text": "%70000s", "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`, "Щ")
-	resp, err = post(t, ts.URL+"/api/v1/comment", veryLongComment)
+	resp, err = post(t, ts.URL+"/api/v1/comment?site=remark42", veryLongComment)
 	assert.NoError(t, err)
 	assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
 	b, err = io.ReadAll(resp.Body)
@@ -235,7 +235,7 @@ func TestRest_CreateWithRestrictedWord(t *testing.T) {
 	badComment := `{"text": "What the duck is that?", "locator":{"url": "https://radio-t.com/blah1",
 "site": "remark42"}}`

-	resp, err := post(t, ts.URL+"/api/v1/comment", badComment)
+	resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42", badComment)
 	assert.NoError(t, err)
 	assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
 	b, err := io.ReadAll(resp.Body)
@@ -254,7 +254,7 @@ func TestRest_CreateRelativeURL(t *testing.T) {

 	// check that it's not possible to click insert URL button and not alter the URL in it (which is `url` by default)
 	relativeURLText := `{"text": "here is a link with relative URL: [google.com](url)", "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`
-	resp, err := post(t, ts.URL+"/api/v1/comment", relativeURLText)
+	resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42", relativeURLText)
 	assert.NoError(t, err)
 	assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
 	b, err := io.ReadAll(resp.Body)
@@ -273,7 +273,7 @@ func TestRest_CreateRejected(t *testing.T) {
 	body := `{"text": "test 123", "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`

 	// try to create without auth
-	resp, err := http.Post(ts.URL+"/api/v1/comment", "", strings.NewReader(body))
+	resp, err := http.Post(ts.URL+"/api/v1/comment?site=remark42", "", strings.NewReader(body))
 	require.NoError(t, err)
 	require.NoError(t, resp.Body.Close())
 	assert.Equal(t, http.StatusUnauthorized, resp.StatusCode)
@@ -281,7 +281,7 @@ func TestRest_CreateRejected(t *testing.T) {
 	// try with wrong aud
 	client := &http.Client{Timeout: 5 * time.Second}
 	defer client.CloseIdleConnections()
-	req, err := http.NewRequest("POST", ts.URL+"/api/v1/comment", strings.NewReader(body))
+	req, err := http.NewRequest("POST", ts.URL+"/api/v1/comment?site=remark42", strings.NewReader(body))
 	require.NoError(t, err)
 	req.Header.Add("X-JWT", devTokenBadAud)
 	resp, err = client.Do(req)
@@ -295,7 +295,7 @@ func TestRest_CreateWithWrongImage(t *testing.T) {
 	defer teardown()

 	// create comment
-	resp, err := post(t, ts.URL+"/api/v1/comment", fmt.Sprintf(`{"text": "![non-existent.jpg](%s/api/v1/picture/dev_user/bad_picture)", "locator":{"url": "https://radio-t.com/blah1", "site": "radio-t"}}`, srv.RemarkURL))
+	resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42", fmt.Sprintf(`{"text": "![non-existent.jpg](%s/api/v1/picture/dev_user/bad_picture)", "locator":{"url": "https://radio-t.com/blah1", "site": "radio-t"}}`, srv.RemarkURL))
 	assert.NoError(t, err)
 	assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
 	b, err := io.ReadAll(resp.Body)
@@ -317,7 +317,7 @@ func TestRest_CreateWithLazyImage(t *testing.T) {
 	defer teardown()
 	body := `{"text": "test 123 ![](http://example.com/image.png)", "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`
 	// create comment
-	resp, err := post(t, ts.URL+"/api/v1/comment", body)
+	resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42", body)
 	require.NoError(t, err)
 	require.Equal(t, http.StatusCreated, resp.StatusCode)
 	b, err := io.ReadAll(resp.Body)
@@ -334,7 +334,7 @@ func TestRest_CreateAndGet(t *testing.T) {
 	defer teardown()

 	// create comment
-	resp, err := post(t, ts.URL+"/api/v1/comment",
+	resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42",
 		`{"text": "**test** *123*\n\n http://radio-t.com", "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`)
 	require.NoError(t, err)
 	require.Equal(t, http.StatusCreated, resp.StatusCode)
@@ -368,6 +368,56 @@ func TestRest_CreateAndGet(t *testing.T) {
 	assert.Equal(t, store.User{Name: "admin", ID: "admin", Admin: true, Blocked: false, IP: ""}, comment.User, "no ip")
 }

+func TestRest_CreateWithQuotes(t *testing.T) {
+	ts, srv, teardown := startupT(t)
+	defer teardown()
+
+	// create comment with quotes with smartypants
+	resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42",
+		`{"text": "smartpants \"quoted\" text", "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`)
+	require.NoError(t, err)
+	require.Equal(t, http.StatusCreated, resp.StatusCode)
+	b, err := io.ReadAll(resp.Body)
+	assert.NoError(t, err)
+	assert.NoError(t, resp.Body.Close())
+	c := R.JSON{}
+	err = json.Unmarshal(b, &c)
+	assert.NoError(t, err)
+	id := c["id"].(string)
+
+	// get created comment by id as non-admin
+	res, code := getWithDevAuth(t, fmt.Sprintf("%s/api/v1/id/%s?site=remark42&url=https://radio-t.com/blah1", ts.URL, id))
+	assert.Equal(t, http.StatusOK, code)
+	comment := store.Comment{}
+	err = json.Unmarshal([]byte(res), &comment)
+	assert.NoError(t, err)
+	assert.Equal(t, "<p>smartpants «quoted» text</p>\n", comment.Text)
+	assert.Equal(t, "smartpants \"quoted\" text", comment.Orig)
+
+	// create comment with quotes without smartypants
+	srv.privRest.disableFancyTextFormatting = true
+	resp, err = post(t, ts.URL+"/api/v1/comment?site=remark42",
+		`{"text": "no_smartpants \"quoted\" text", "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`)
+	require.NoError(t, err)
+	require.Equal(t, http.StatusCreated, resp.StatusCode)
+	b, err = io.ReadAll(resp.Body)
+	assert.NoError(t, err)
+	assert.NoError(t, resp.Body.Close())
+	c = R.JSON{}
+	err = json.Unmarshal(b, &c)
+	assert.NoError(t, err)
+	id = c["id"].(string)
+
+	// get created comment by id as non-admin
+	res, code = getWithDevAuth(t, fmt.Sprintf("%s/api/v1/id/%s?site=remark42&url=https://radio-t.com/blah1", ts.URL, id))
+	assert.Equal(t, http.StatusOK, code)
+	comment = store.Comment{}
+	err = json.Unmarshal([]byte(res), &comment)
+	assert.NoError(t, err)
+	assert.Equal(t, "<p>no_smartpants &#34;quoted&#34; text</p>\n", comment.Text)
+	assert.Equal(t, "no_smartpants \"quoted\" text", comment.Orig)
+}
+
 func TestRest_Update(t *testing.T) {
 	ts, _, teardown := startupT(t)
 	defer teardown()
@@ -811,10 +861,10 @@ func TestRest_EmailAndTelegram(t *testing.T) {
 	// issue good token
 	claims := token.Claims{
 		Handshake: &token.Handshake{ID: "provider1_dev::good@example.com"},
-		StandardClaims: jwt.StandardClaims{
-			Audience:  "remark42",
-			ExpiresAt: time.Now().Add(10 * time.Minute).Unix(),
-			NotBefore: time.Now().Add(-1 * time.Minute).Unix(),
+		RegisteredClaims: jwt.RegisteredClaims{
+			Audience:  jwt.ClaimStrings{"remark42"},
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(10 * time.Minute)),
+			NotBefore: jwt.NewNumericDate(time.Now().Add(-1 * time.Minute)),
 			Issuer:    "remark42",
 		},
 	}
@@ -832,30 +882,30 @@ func TestRest_EmailAndTelegram(t *testing.T) {
 		body         string
 	}{
 		{description: "issue delete request without auth", url: "/api/v1/email", method: http.MethodDelete, responseCode: http.StatusUnauthorized, noAuth: true},
-		{description: "issue delete request without site_id", url: "/api/v1/email", method: http.MethodDelete, responseCode: http.StatusBadRequest},
+		{description: "issue delete request without site_id", url: "/api/v1/email", method: http.MethodDelete, responseCode: http.StatusForbidden},
 		{description: "delete non-existent user email", url: "/api/v1/email?site=remark42", method: http.MethodDelete, responseCode: http.StatusOK},
-		{description: "set user email, token not set", url: "/api/v1/email/confirm", method: http.MethodPost, responseCode: http.StatusBadRequest, body: `{"site":"remark42"}`},
+		{description: "set user email, token not set", url: "/api/v1/email/confirm?site=remark42", method: http.MethodPost, responseCode: http.StatusBadRequest, body: `{"site":"remark42"}`},
 		{description: "set user email, token not set, old query param", url: "/api/v1/email/confirm?site=remark42", method: http.MethodPost, responseCode: http.StatusBadRequest},
-		{description: "send email confirmation without address", url: "/api/v1/email/subscribe", method: http.MethodPost, responseCode: http.StatusBadRequest, body: `{"site":"remark42"}`},
+		{description: "send email confirmation without address", url: "/api/v1/email/subscribe?site=remark42", method: http.MethodPost, responseCode: http.StatusBadRequest, body: `{"site":"remark42"}`},
 		{description: "send email confirmation without address, old query param", url: "/api/v1/email/subscribe?site=remark42", method: http.MethodPost, responseCode: http.StatusBadRequest},
-		{description: "send email confirmation", url: "/api/v1/email/subscribe", method: http.MethodPost, responseCode: http.StatusOK, body: `{"site":"remark42","address":"good@example.com"}`},
+		{description: "send email confirmation", url: "/api/v1/email/subscribe?site=remark42", method: http.MethodPost, responseCode: http.StatusOK, body: `{"site":"remark42","address":"good@example.com"}`},
 		{description: "send email confirmation, old query param", url: "/api/v1/email/subscribe?site=remark42&address=good@example.com", method: http.MethodPost, responseCode: http.StatusOK},
-		{description: "set user email, token is good", url: "/api/v1/email/confirm", method: http.MethodPost, responseCode: http.StatusOK, cookieEmail: "good@example.com", body: fmt.Sprintf(`{"site":"remark42","token":%q}`, goodToken)},
+		{description: "set user email, token is good", url: "/api/v1/email/confirm?site=remark42", method: http.MethodPost, responseCode: http.StatusOK, cookieEmail: "good@example.com", body: fmt.Sprintf(`{"site":"remark42","token":%q}`, goodToken)},
 		{description: "set user email, token is good, old query param", url: fmt.Sprintf("/api/v1/email/confirm?site=remark42&tkn=%s", goodToken), method: http.MethodPost, responseCode: http.StatusOK, cookieEmail: "good@example.com"},
 		{description: "send confirmation with same address", url: "/api/v1/email/subscribe?site=remark42&address=good@example.com", method: http.MethodPost, responseCode: http.StatusConflict},
 		{description: "get user email", url: "/api/v1/email?site=remark42", method: http.MethodGet, responseCode: http.StatusOK},
 		{description: "delete user email", url: "/api/v1/email?site=remark42", method: http.MethodDelete, responseCode: http.StatusOK},
 		{description: "send another confirmation", url: "/api/v1/email/subscribe?site=remark42&address=good@example.com", method: http.MethodPost, responseCode: http.StatusOK},
-		{description: "set user email, token is good", url: "/api/v1/email/confirm", method: http.MethodPost, responseCode: http.StatusOK, cookieEmail: "good@example.com", body: fmt.Sprintf(`{"site":"remark42","token":%q}`, goodToken)},
+		{description: "set user email, token is good", url: "/api/v1/email/confirm?site=remark42", method: http.MethodPost, responseCode: http.StatusOK, cookieEmail: "good@example.com", body: fmt.Sprintf(`{"site":"remark42","token":%q}`, goodToken)},
 		{description: "set user email, token is good, old query param", url: fmt.Sprintf("/api/v1/email/confirm?site=remark42&tkn=%s", goodToken), method: http.MethodPost, responseCode: http.StatusOK, cookieEmail: "good@example.com"},
 		{description: "unsubscribe user, no token", url: "/email/unsubscribe.html?site=remark42", method: http.MethodPost, responseCode: http.StatusBadRequest},
 		{description: "unsubscribe user, wrong token", url: "/email/unsubscribe.html?site=remark42&tkn=jwt", method: http.MethodGet, responseCode: http.StatusForbidden},
 		{description: "unsubscribe user, good token", url: fmt.Sprintf("/email/unsubscribe.html?site=remark42&tkn=%s", goodToken), method: http.MethodPost, responseCode: http.StatusOK},
 		{description: "unsubscribe user second time, good token", url: fmt.Sprintf("/email/unsubscribe.html?site=remark42&tkn=%s", goodToken), method: http.MethodPost, responseCode: http.StatusConflict},
 		{description: "issue delete request without auth", url: "/api/v1/telegram", method: http.MethodDelete, responseCode: http.StatusUnauthorized, noAuth: true},
-		{description: "issue delete request without site_id", url: "/api/v1/telegram", method: http.MethodDelete, responseCode: http.StatusBadRequest},
+		{description: "issue delete request without site_id", url: "/api/v1/telegram", method: http.MethodDelete, responseCode: http.StatusForbidden},
 		{description: "delete non-existent user telegram", url: "/api/v1/telegram?site=remark42", method: http.MethodDelete, responseCode: http.StatusOK},
-		{description: "send telegram confirmation, no siteID", url: "/api/v1/telegram/subscribe", method: http.MethodGet, responseCode: http.StatusBadRequest},
+		{description: "send telegram confirmation, no siteID", url: "/api/v1/telegram/subscribe", method: http.MethodGet, responseCode: http.StatusForbidden},
 		{description: "send telegram confirmation", url: "/api/v1/telegram/subscribe?site=remark42", method: http.MethodGet, responseCode: http.StatusOK},
 		{description: "set user telegram, token is good", url: "/api/v1/telegram/subscribe?site=remark42&tkn=good_token", method: http.MethodGet, responseCode: http.StatusOK},
 		{description: "send confirmation with same address", url: "/api/v1/telegram/subscribe?site=remark42", method: http.MethodGet, responseCode: http.StatusConflict},
@@ -866,7 +916,6 @@ func TestRest_EmailAndTelegram(t *testing.T) {
 	client := http.Client{}
 	defer client.CloseIdleConnections()
 	for _, x := range testData {
-		x := x
 		t.Run(x.description, func(t *testing.T) {
 			reqBody := io.NopCloser(strings.NewReader(x.body))
 			if x.body == "" {
@@ -907,7 +956,7 @@ func TestRest_EmailNotification(t *testing.T) {
 	defer client.CloseIdleConnections()

 	// create new comment from dev user
-	req, err := http.NewRequest("POST", ts.URL+"/api/v1/comment", strings.NewReader(
+	req, err := http.NewRequest("POST", ts.URL+"/api/v1/comment?site=remark42", strings.NewReader(
 		`{"text": "test 123",
 "user": {"name": "provider1_dev::good@example.com"},
 "locator":{"url": "https://radio-t.com/blah1",
@@ -921,14 +970,14 @@ func TestRest_EmailNotification(t *testing.T) {
 	require.NoError(t, resp.Body.Close())
 	require.Equal(t, http.StatusCreated, resp.StatusCode, string(body))
 	parentComment := store.Comment{}
-	require.NoError(t, render.DecodeJSON(strings.NewReader(string(body)), &parentComment))
+	require.NoError(t, json.Unmarshal(body, &parentComment))
 	// wait for mock notification Submit to kick off
 	time.Sleep(time.Millisecond * 30)
 	require.Equal(t, 1, len(mockDestination.Get()))
 	assert.Empty(t, mockDestination.Get()[0].Emails)

 	// create child comment from another user, email notification only to admin expected
-	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment", strings.NewReader(fmt.Sprintf(
+	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment?site=remark42", strings.NewReader(fmt.Sprintf(
 		`{"text": "test 456",
 	"pid": %q,
 	"user": {"name": "other_user"},
@@ -950,7 +999,7 @@ func TestRest_EmailNotification(t *testing.T) {
 	// send confirmation token for email
 	req, err = http.NewRequest(
 		http.MethodPost,
-		ts.URL+"/api/v1/email/subscribe",
+		ts.URL+"/api/v1/email/subscribe?site=remark42",
 		io.NopCloser(strings.NewReader(`{"site": "remark42", "address": "good@example.com"}`)),
 	)
 	require.NoError(t, err)
@@ -989,7 +1038,7 @@ func TestRest_EmailNotification(t *testing.T) {
 	// verify email
 	req, err = http.NewRequest(
 		http.MethodPost,
-		ts.URL+"/api/v1/email/confirm",
+		ts.URL+"/api/v1/email/confirm?site=remark42",
 		io.NopCloser(strings.NewReader(fmt.Sprintf(`{"site": "remark42", "token": %q}`, verificationToken))),
 	)
 	require.NoError(t, err)
@@ -1021,7 +1070,7 @@ func TestRest_EmailNotification(t *testing.T) {
 		Picture: "http://example.com/pic.png", IP: "127.0.0.1", SiteID: "remark42"}, subscribedUser)

 	// create child comment from another user, email notification expected
-	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment", strings.NewReader(fmt.Sprintf(
+	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment?site=remark42", strings.NewReader(fmt.Sprintf(
 		`{"text": "test 789",
 	"pid": %q,
 	"user": {"name": "other_user"},
@@ -1052,7 +1101,7 @@ func TestRest_EmailNotification(t *testing.T) {
 	assert.Equal(t, http.StatusOK, resp.StatusCode, string(body))

 	// create child comment from another user, no email notification
-	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment", strings.NewReader(
+	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment?site=remark42", strings.NewReader(
 		`{"text": "test 321",
 	"user": {"name": "other_user"},
 	"locator":{"url": "https://radio-t.com/blah1",
@@ -1110,7 +1159,7 @@ func TestRest_EmailNotification(t *testing.T) {
 	// confirm email via subscribe call, no email notification is expected
 	req, err = http.NewRequest(
 		http.MethodPost,
-		ts.URL+"/api/v1/email/subscribe",
+		ts.URL+"/api/v1/email/subscribe?site=remark42",
 		io.NopCloser(strings.NewReader(`{"site": "remark42", "address": "good@example.com"}`)),
 	)
 	require.NoError(t, err)
@@ -1157,7 +1206,7 @@ func TestRest_TelegramNotification(t *testing.T) {
 	defer client.CloseIdleConnections()

 	// create new comment from dev user
-	req, err := http.NewRequest("POST", ts.URL+"/api/v1/comment", strings.NewReader(
+	req, err := http.NewRequest("POST", ts.URL+"/api/v1/comment?site=remark42", strings.NewReader(
 		`{"text": "test 123",
 "user": {"name": "provider1_dev::good@example.com"},
 "locator":{"url": "https://radio-t.com/blah1",
@@ -1171,14 +1220,14 @@ func TestRest_TelegramNotification(t *testing.T) {
 	require.NoError(t, resp.Body.Close())
 	require.Equal(t, http.StatusCreated, resp.StatusCode, string(body))
 	parentComment := store.Comment{}
-	require.NoError(t, render.DecodeJSON(strings.NewReader(string(body)), &parentComment))
+	require.NoError(t, json.Unmarshal(body, &parentComment))
 	// wait for mock notification Submit to kick off
 	time.Sleep(time.Millisecond * 30)
 	require.Equal(t, 1, len(mockDestination.Get()))
 	assert.Empty(t, mockDestination.Get()[0].Telegrams)

 	// create child comment from another user, telegram notification only to admin expected
-	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment", strings.NewReader(fmt.Sprintf(
+	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment?site=remark42", strings.NewReader(fmt.Sprintf(
 		`{"text": "test 456",
 	"pid": %q,
 	"user": {"name": "other_user"},
@@ -1291,7 +1340,7 @@ func TestRest_TelegramNotification(t *testing.T) {
 		Picture: "http://example.com/pic.png", IP: "127.0.0.1", SiteID: "remark42"}, user)

 	// create child comment from another user, telegram notification expected
-	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment", strings.NewReader(fmt.Sprintf(
+	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment?site=remark42", strings.NewReader(fmt.Sprintf(
 		`{"text": "test 789",
 	"pid": %q,
 	"user": {"name": "other_user"},
@@ -1322,7 +1371,7 @@ func TestRest_TelegramNotification(t *testing.T) {
 	assert.Equal(t, http.StatusOK, resp.StatusCode, string(body))

 	// create child comment from another user, no telegram notification
-	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment", strings.NewReader(
+	req, err = http.NewRequest("POST", ts.URL+"/api/v1/comment?site=remark42", strings.NewReader(
 		`{"text": "test 321",
 	"user": {"name": "other_user"},
 	"locator":{"url": "https://radio-t.com/blah1",
@@ -1407,7 +1456,7 @@ func TestRest_UserAllDataManyComments(t *testing.T) {
 	c := store.Comment{User: user, Text: "test test #1", Locator: store.Locator{SiteID: "remark42",
 		URL: "https://radio-t.com/blah1"}, Timestamp: time.Date(2018, 5, 27, 1, 14, 10, 0, time.Local)}

-	for i := 0; i < 51; i++ {
+	for i := range 51 {
 		c.ID = fmt.Sprintf("id-%03d", i)
 		c.Timestamp = c.Timestamp.Add(time.Second)
 		_, err := srv.DataService.Create(c)
@@ -1487,7 +1536,7 @@ func TestRest_SavePictureCtrl(t *testing.T) {

 		client := http.Client{}
 		defer client.CloseIdleConnections()
-		req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s/api/v1/picture", ts.URL), bodyBuf)
+		req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s/api/v1/picture?site=remark42", ts.URL), bodyBuf)
 		require.NoError(t, err)
 		req.Header.Add("Content-Type", contentType)
 		req.Header.Add("X-JWT", devToken)
@@ -1579,7 +1628,7 @@ func TestRest_CreateWithPictures(t *testing.T) {
 		require.NoError(t, bodyWriter.Close())
 		client := http.Client{}
 		defer client.CloseIdleConnections()
-		req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s/api/v1/picture", ts.URL), bodyBuf)
+		req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s/api/v1/picture?site=remark42", ts.URL), bodyBuf)
 		require.NoError(t, err)
 		req.Header.Add("Content-Type", contentType)
 		req.Header.Add("X-JWT", devToken)
@@ -1605,7 +1654,7 @@ func TestRest_CreateWithPictures(t *testing.T) {
 	text := fmt.Sprintf(`text 123  ![](%s/api/v1/picture/%s) *xxx* ![](%s/api/v1/picture/%s) ![](%s/api/v1/picture/%s)`, svc.RemarkURL, ids[0], svc.RemarkURL, ids[1], svc.RemarkURL, ids[2])
 	body := fmt.Sprintf(`{"text": %q, "locator":{"url": "https://radio-t.com/blah1", "site": "remark42"}}`, text)

-	resp, err := post(t, ts.URL+"/api/v1/comment", body)
+	resp, err := post(t, ts.URL+"/api/v1/comment?site=remark42", body)
 	assert.NoError(t, err)
 	b, err := io.ReadAll(resp.Body)
 	assert.NoError(t, err)
@@ -1642,3 +1691,26 @@ func (m *mockTelegram) CheckToken(string, string) (telegram, site string, err er
 	}
 	return "good_telegram", m.site, nil
 }
+
+func TestExtractIP(t *testing.T) {
+	tbl := []struct {
+		addr string
+		exp  string
+	}{
+		{"127.0.0.1:8080", "127.0.0.1"},
+		{"127.0.0.1", "127.0.0.1"},
+		{"192.168.1.1:443", "192.168.1.1"},
+		{"[::1]:8080", "::1"},
+		{"::1", "::1"},
+		{"[2001:db8::1]:8080", "2001:db8::1"},
+		{"2001:db8::1", "2001:db8::1"},
+		{"[fe80::1%25eth0]:80", "fe80::1%25eth0"},
+		{"", ""},
+	}
+
+	for _, tt := range tbl {
+		t.Run(tt.addr, func(t *testing.T) {
+			assert.Equal(t, tt.exp, extractIP(tt.addr))
+		})
+	}
+}
@@ -4,18 +4,20 @@ import (
 	"bytes"
 	"crypto/sha1" // nolint
 	"encoding/base64"
+	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
 	"strconv"
 	"strings"
 	"time"
+	"unicode"

 	"github.com/go-chi/chi/v5"
-	"github.com/go-chi/render"
-	cache "github.com/go-pkgz/lcw"
+	cache "github.com/go-pkgz/lcw/v2"
 	log "github.com/go-pkgz/lgr"
 	R "github.com/go-pkgz/rest"
+	"github.com/google/uuid"
 	"github.com/skip2/go-qrcode"

 	"github.com/umputun/remark42/backend/app/rest"
@@ -48,8 +50,18 @@ type pubStore interface {
 	Counts(siteID string, postIDs []string) ([]store.PostInfo, error)
 }

-// GET /find?site=siteID&url=post-url&format=[tree|plain]&sort=[+/-time|+/-score|+/-controversy]&view=[user|all]&since=unix_ts_msec
-// find comments for given post. Returns in tree or plain formats, sorted
+// GET /find?site=siteID&url=post-url&format=[tree|plain]&sort=[+/-time|+/-score|+/-controversy]&view=[user|all]&since=unix_ts_msec&limit=100&offset_id={id}
+// find comments for given post. Returns in tree or plain formats, sorted.
+//
+// When `url` parameter is not set (e.g. request is for site-wide comments), does not return deleted comments.
+//
+// When `limit` is set, first {limit} comments are returned. When `offset_id` is set, comments are returned starting
+// after the comment with the given id.
+// format="tree" limits comments by top-level comments and all their replies,
+// and never returns parent comment with only part of replies.
+//
+// `count` in the response refers to total number of non-deleted comments,
+// `count_left` to amount of comments left to be returned _including deleted_.
 func (s *public) findCommentsCtrl(w http.ResponseWriter, r *http.Request) {
 	locator := store.Locator{SiteID: r.URL.Query().Get("site"), URL: r.URL.Query().Get("url")}
 	sort := r.URL.Query().Get("sort")
@@ -68,7 +80,24 @@ func (s *public) findCommentsCtrl(w http.ResponseWriter, r *http.Request) {
 		since = time.Time{} // since doesn't make sense for tree
 	}

-	log.Printf("[DEBUG] get comments for %+v, sort %s, format %s, since %v", locator, sort, format, since)
+	limitParam := r.URL.Query().Get("limit")
+	var limit int
+	if limitParam != "" {
+		if limit, err = strconv.Atoi(limitParam); err != nil {
+			rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "bad limit value", rest.ErrCommentNotFound)
+			return
+		}
+	}
+
+	offsetID := r.URL.Query().Get("offset_id")
+	if offsetID != "" {
+		if _, err = uuid.Parse(offsetID); err != nil {
+			rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "bad offset_id value", rest.ErrCommentNotFound)
+			return
+		}
+	}
+
+	log.Printf("[DEBUG] get comments for %+v, sort %s, format %s, since %v, limit %d, offset %s", locator, sort, format, since, limit, offsetID)

 	key := cache.NewKey(locator.SiteID).ID(URLKeyWithUser(r)).Scopes(locator.SiteID, locator.URL)
 	data, err := s.cache.Get(key, func() ([]byte, error) {
@@ -77,22 +106,44 @@ func (s *public) findCommentsCtrl(w http.ResponseWriter, r *http.Request) {
 			comments = []store.Comment{} // error should clear comments and continue for post info
 		}
 		comments = s.applyView(comments, view)
+
+		var commentsInfo store.PostInfo
+		if info, ee := s.dataService.Info(locator, s.readOnlyAge); ee == nil {
+			commentsInfo = info
+		}
+
+		if !since.IsZero() { // if since is set, number of comments can be different from total in the DB
+			commentsInfo.Count = 0
+			for _, c := range comments {
+				if !c.Deleted {
+					commentsInfo.Count++
+				}
+			}
+		}
+
+		// post might be readonly without any comments, Info call will fail then and ReadOnly flag should be checked separately
+		if !commentsInfo.ReadOnly && locator.URL != "" && s.dataService.IsReadOnly(locator) {
+			commentsInfo.ReadOnly = true
+		}
+
 		var b []byte
 		switch format {
 		case "tree":
-			tree := service.MakeTree(comments, sort, s.readOnlyAge)
-			if tree.Nodes == nil { // eliminate json nil serialization
-				tree.Nodes = []*service.Node{}
+			withInfo := treeWithInfo{Tree: service.MakeTree(comments, sort, limit, offsetID), Info: commentsInfo}
+			withInfo.Info.CountLeft = withInfo.CountLeft()
+			withInfo.Info.LastComment = withInfo.LastComment()
+			if withInfo.Nodes == nil { // eliminate json nil serialization
+				withInfo.Nodes = []*service.Node{}
 			}
-			if s.dataService.IsReadOnly(locator) {
-				tree.Info.ReadOnly = true
-			}
-			b, e = encodeJSONWithHTML(tree)
+			b, e = encodeJSONWithHTML(withInfo)
 		default:
-			withInfo := commentsWithInfo{Comments: comments}
-			if info, ee := s.dataService.Info(locator, s.readOnlyAge); ee == nil {
-				withInfo.Info = info
+			if limit > 0 || offsetID != "" {
+				comments, commentsInfo.CountLeft = limitComments(comments, limit, offsetID)
 			}
+			if limit > 0 && len(comments) > 0 {
+				commentsInfo.LastComment = comments[len(comments)-1].ID
+			}
+			withInfo := commentsWithInfo{Comments: comments, Info: commentsInfo}
 			b, e = encodeJSONWithHTML(withInfo)
 		}
 		return b, e
@@ -182,7 +233,6 @@ func (s *public) commentByIDCtrl(w http.ResponseWriter, r *http.Request) {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't get comment by id", rest.ErrCommentNotFound)
 		return
 	}
-	render.Status(r, http.StatusOK)

 	if err = R.RenderJSONWithHTML(w, r, comment); err != nil {
 		log.Printf("[WARN] can't render last comments for url=%s, id=%s", url, id)
@@ -247,7 +297,7 @@ func (s *public) countCtrl(w http.ResponseWriter, r *http.Request) {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't get count", rest.ErrPostNotFound)
 		return
 	}
-	render.JSON(w, r, R.JSON{"count": count, "locator": locator})
+	R.RenderJSON(w, R.JSON{"count": count, "locator": locator})
 }

 // POST /counts?site=siteID - get number of comments for posts from post body
@@ -255,7 +305,7 @@ func (s *public) countMultiCtrl(w http.ResponseWriter, r *http.Request) {
 	const countBodyLimit int64 = 1024 * 128 // count request can be big for some site because it lists all urls
 	siteID := r.URL.Query().Get("site")
 	posts := []string{}
-	if err := render.DecodeJSON(http.MaxBytesReader(w, r.Body, countBodyLimit), &posts); err != nil {
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, countBodyLimit)).Decode(&posts); err != nil {
 		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't get list of posts from request", rest.ErrSiteNotFound)
 		return
 	}
@@ -315,26 +365,81 @@ func (s *public) listCtrl(w http.ResponseWriter, r *http.Request) {
 	}
 }

+// safePictureSegment reports whether seg is acceptable as a path segment in
+// the picture URL (no traversal markers, no path separators, no control
+// characters). Picture IDs are server-generated hashes plus a known
+// extension, so any value carrying these characters is hostile and must be
+// rejected before reaching the store. Rejecting controls (CR, LF, TAB, NUL,
+// etc.) also closes a log-injection vector since the rejected segment is
+// echoed into the access log.
+func safePictureSegment(seg string) bool {
+	if seg == "" || seg == "." {
+		return false
+	}
+	if strings.ContainsAny(seg, "/\\") {
+		return false
+	}
+	if strings.Contains(seg, "..") { // also covers seg == ".."
+		return false
+	}
+	for _, r := range seg {
+		if unicode.IsControl(r) {
+			return false
+		}
+	}
+	return true
+}
+
+// sendPictureError writes a no-store Cache-Control header and delegates to rest.SendErrorJSON.
+// Used by every rejection branch in loadPictureCtrl so error responses never inherit the
+// 7-day client cache of the success path.
+func sendPictureError(w http.ResponseWriter, r *http.Request, status int, err error, details string, code int) {
+	w.Header().Set("Cache-Control", "no-store")
+	rest.SendErrorJSON(w, r, status, err, details, code)
+}
+
 // GET /picture/{user}/{id} - get picture
 func (s *public) loadPictureCtrl(w http.ResponseWriter, r *http.Request) {
-	id := chi.URLParam(r, "user") + "/" + chi.URLParam(r, "id")
-	img, err := s.imageService.Load(id)
-	if err != nil {
-		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't get image "+id, rest.ErrAssetNotFound)
+	rest.SetImageDefenseHeaders(w)
+
+	user, imgID := chi.URLParam(r, "user"), chi.URLParam(r, "id")
+	if user == "" || imgID == "" || !safePictureSegment(user) || !safePictureSegment(imgID) {
+		log.Printf("[WARN] rejected picture request with unsafe id segments user=%q id=%q", user, imgID)
+		sendPictureError(w, r, http.StatusBadRequest, fmt.Errorf("invalid picture id"), "invalid picture id", rest.ErrAssetNotFound)
 		return
 	}
-	// enforce client-side caching
+	id := user + "/" + imgID
+	img, err := s.imageService.Load(id)
+	if err != nil {
+		log.Printf("[WARN] can't load image %s: %v", id, err)
+		sendPictureError(w, r, http.StatusBadRequest, fmt.Errorf("image not found"), "can't get image", rest.ErrAssetNotFound)
+		return
+	}
+
+	contentType, err := rest.SafeImgContentType(img)
+	if err != nil {
+		log.Printf("[WARN] rejecting non-image picture %s: %v", id, err)
+		sendPictureError(w, r, http.StatusUnsupportedMediaType, err, "invalid image content", rest.ErrAssetNotFound)
+		return
+	}
+
+	// /picture/ does not need a security-version etag prefix — the upload flow
+	// validates input format (readAndValidateImage) and the serve path re-validates
+	// the stored bytes via rest.SafeImgContentType. Bytes within the resize dimension
+	// limits ARE preserved verbatim by resize, so the browser defense relies on the
+	// response headers (validated Content-Type + nosniff + strict CSP +
+	// Content-Disposition: inline), not on byte normalization. Picture IDs are limited
+	// to safePictureSegment (alphanumeric xid-generated guids), so the comma split
+	// inside rest.EtagMatches cannot collide; if the ID format ever changes, revisit.
 	etag := `"` + id + `"`
 	w.Header().Set("Etag", etag)
 	w.Header().Set("Cache-Control", "max-age=604800") // 7 days
-	if match := r.Header.Get("If-None-Match"); match != "" {
-		if strings.Contains(match, etag) {
-			w.WriteHeader(http.StatusNotModified)
-			return
-		}
+	if match := r.Header.Get("If-None-Match"); match != "" && rest.EtagMatches(match, etag) {
+		w.WriteHeader(http.StatusNotModified)
+		return
 	}

-	w.Header().Set("Content-Type", s.imageService.ImgContentType(img))
+	w.Header().Set("Content-Type", contentType)
 	w.Header().Set("Content-Length", strconv.Itoa(len(img)))
 	w.WriteHeader(http.StatusOK)
 	if _, err = io.Copy(w, bytes.NewReader(img)); err != nil {
@@ -343,13 +448,14 @@ func (s *public) loadPictureCtrl(w http.ResponseWriter, r *http.Request) {
 }

 // GET /robots.txt
-func (s *public) robotsCtrl(w http.ResponseWriter, r *http.Request) {
+func (s *public) robotsCtrl(w http.ResponseWriter, _ *http.Request) {
 	allowed := []string{"/find", "/last", "/id", "/count", "/counts", "/list", "/config", "/user",
 		"/img", "/avatar", "/picture"}
 	for i := range allowed {
 		allowed[i] = "Allow: /api/v1" + allowed[i]
 	}
-	render.PlainText(w, r, "User-agent: *\nDisallow: /auth/\nDisallow: /api/\n"+strings.Join(allowed, "\n")+"\n")
+	responseText := fmt.Sprintf("User-agent: *\nDisallow: /auth/\nDisallow: /api/\n%s\n", strings.Join(allowed, "\n"))
+	rest.PlainTextResponse(w, http.StatusOK, responseText)
 }

 // GET /qr/telegram - generates QR for provided URL, used for Telegram auth and notifications subscription. The first
@@ -381,7 +487,7 @@ func (s *public) telegramQrCtrl(w http.ResponseWriter, r *http.Request) {
 	}

 	w.Header().Set("Content-Type", "image/png")
-	if _, err = w.Write(png); err != nil {
+	if _, err = w.Write(png); err != nil { //nolint:gosec // png bytes from go-qrcode, not HTML
 		log.Printf("[WARN] can't render qr, %v", err)
 	}
 }
@@ -416,3 +522,25 @@ func (s *public) parseSince(r *http.Request) (time.Time, error) {
 	}
 	return sinceTS, nil
 }
+
+// limitComments returns limited list of comments and count of comments left after limit.
+// If offsetID is provided, the list will be sliced starting from the comment with this ID.
+// If offsetID is not found, the full list will be returned.
+// It's used for only "
+func limitComments(c []store.Comment, limit int, offsetID string) (comments []store.Comment, countLeft int) {
+	if offsetID != "" {
+		for i, comment := range c {
+			if comment.ID == offsetID {
+				c = c[i+1:]
+				break
+			}
+		}
+	}
+
+	if limit > 0 && len(c) > limit {
+		countLeft = len(c) - limit
+		c = c[:limit]
+	}
+
+	return c, countLeft
+}
@@ -1,21 +1,28 @@
 package api

 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"io"
+	"mime/multipart"
 	"net/http"
+	"net/http/httptest"
 	"os"
+	"strconv"
 	"strings"
 	"testing"
 	"time"

-	cache "github.com/go-pkgz/lcw"
+	"github.com/go-chi/chi/v5"
+	cache "github.com/go-pkgz/lcw/v2"
 	R "github.com/go-pkgz/rest"
+	"github.com/google/uuid"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"

 	"github.com/umputun/remark42/backend/app/store"
+	"github.com/umputun/remark42/backend/app/store/image"
 	"github.com/umputun/remark42/backend/app/store/service"
 )

@@ -83,6 +90,24 @@ func TestRest_Preview(t *testing.T) {
 		string(b),
 		"/pics-remark42/staging/dev_user/62/bad_picture: no such file or directory\"}\n",
 	)
+
+	// test quotes with and without smartypants
+	resp, err = post(t, ts.URL+"/api/v1/preview", `{"text": "\"quoted\" text", "locator":{"url": "https://radio-t.com/blah1", "site": "radio-t"}}`)
+	assert.NoError(t, err)
+	assert.Equal(t, http.StatusOK, resp.StatusCode)
+	b, err = io.ReadAll(resp.Body)
+	assert.NoError(t, err)
+	assert.NoError(t, resp.Body.Close())
+	assert.Equal(t, "<p>«quoted» text</p>\n", string(b))
+
+	srv.privRest.disableFancyTextFormatting = true
+	resp, err = post(t, ts.URL+"/api/v1/preview", `{"text": "\"quoted\" text", "locator":{"url": "https://radio-t.com/blah1", "site": "radio-t"}}`)
+	assert.NoError(t, err)
+	assert.Equal(t, http.StatusOK, resp.StatusCode)
+	b, err = io.ReadAll(resp.Body)
+	assert.NoError(t, err)
+	assert.NoError(t, resp.Body.Close())
+	assert.Equal(t, "<p>&#34;quoted&#34; text</p>\n", string(b))
 }

 func TestRest_PreviewWithWrongImage(t *testing.T) {
@@ -120,9 +145,9 @@ srv, ts := prep(t)
 }
 BKT
 `
-	text = strings.Replace(text, "BKT", "```", -1)
+	text = strings.ReplaceAll(text, "BKT", "```")
 	j := fmt.Sprintf(`{"text": %q, "locator":{"url": "https://radio-t.com/blah1", "site": "radio-t"}}`, text)
-	j = strings.Replace(j, "\n", "\\n", -1)
+	j = strings.ReplaceAll(j, "\n", "\\n")

 	resp, err := post(t, ts.URL+"/api/v1/preview", j)
 	assert.NoError(t, err)
@@ -131,10 +156,10 @@ BKT
 	assert.NoError(t, err)
 	assert.Equal(t,
 		`<h1>h1</h1>
-<pre class="chroma"><code><span class="line"><span class="cl">func TestRest_Preview(t *testing.T) {
-</span></span><span class="line"><span class="cl">srv, ts := prep(t)
-</span></span><span class="line"><span class="cl">  require.NotNil(t, srv)
-</span></span><span class="line"><span class="cl">}
+<pre class="chroma"><code><span class="line"><span class="cl"><span class="k">func</span> <span class="n">TestRest_Preview</span><span class="p">(</span><span class="n">t</span> <span class="o">*</span><span class="n">testing</span><span class="o">.</span><span class="n">T</span><span class="p">)</span> <span class="p">{</span>
+</span></span><span class="line"><span class="cl"><span class="n">srv</span><span class="p">,</span> <span class="n">ts</span> <span class="p">:</span><span class="o">=</span> <span class="n">prep</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
+</span></span><span class="line"><span class="cl">  <span class="n">require</span><span class="o">.</span><span class="n">NotNil</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">srv</span><span class="p">)</span>
+</span></span><span class="line"><span class="cl"><span class="p">}</span>
 </span></span></code></pre>`,
 		string(b))
 	assert.NoError(t, resp.Body.Close())
@@ -148,17 +173,17 @@ func TestRest_PreviewCode(t *testing.T) {
 func main(aa string) int {return 0}
 BKT
 `
-	text = strings.Replace(text, "BKT", "```", -1)
+	text = strings.ReplaceAll(text, "BKT", "```")
 	j := fmt.Sprintf(`{"text": %q, "locator":{"url": "https://radio-t.com/blah1", "site": "radio-t"}}`, text)
-	j = strings.Replace(j, "\n", "\\n", -1)
+	j = strings.ReplaceAll(j, "\n", "\\n")

 	resp, err := post(t, ts.URL+"/api/v1/preview", j)
 	assert.NoError(t, err)
 	assert.Equal(t, http.StatusOK, resp.StatusCode)
 	b, err := io.ReadAll(resp.Body)
 	assert.NoError(t, err)
-	assert.Equal(t, `<pre class="chroma"><code><span class="line"><span class="cl"><span class="kd">func</span> <span class="nf">main</span><span class="p">(</span><span class="nx">aa</span> <span class="kt">string</span><span class="p">)</span> <span class="kt">int</span> <span class="p">{</span><span class="k">return</span> <span class="mi">0</span><span class="p">}</span>
-</span></span></code></pre>`, string(b))
+	assert.Equal(t, `<pre class="chroma"><code><span class="line"><span class="cl"><span class="kd">func</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="nx">aa</span><span class="w"> </span><span class="kt">string</span><span class="p">)</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="p">{</span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">}</span><span class="w">
+</span></span></span></code></pre>`, string(b))
 	assert.NoError(t, resp.Body.Close())
 }

@@ -209,7 +234,7 @@ func TestRest_Find(t *testing.T) {
 	assert.Equal(t, id2, comments.Comments[0].ID)

 	// get in tree mode
-	tree := service.Tree{}
+	tree := treeWithInfo{}
 	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah1&format=tree")
 	assert.Equal(t, http.StatusOK, code)
 	err = json.Unmarshal([]byte(res), &tree)
@@ -235,7 +260,7 @@ func TestRest_FindAge(t *testing.T) {
 	_, err = srv.DataService.Create(c2)
 	require.NoError(t, err)

-	tree := service.Tree{}
+	tree := treeWithInfo{}

 	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah1&format=tree")
 	assert.Equal(t, http.StatusOK, code)
@@ -278,7 +303,7 @@ func TestRest_FindReadOnly(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, resp.Body.Close())

-	tree := service.Tree{}
+	tree := treeWithInfo{}
 	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah1&format=tree")
 	assert.Equal(t, http.StatusOK, code)
 	err = json.Unmarshal([]byte(res), &tree)
@@ -286,7 +311,7 @@ func TestRest_FindReadOnly(t *testing.T) {
 	assert.Equal(t, "https://radio-t.com/blah1", tree.Info.URL)
 	assert.True(t, tree.Info.ReadOnly, "post is ro")

-	tree = service.Tree{}
+	tree = treeWithInfo{}
 	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah2&format=tree")
 	assert.Equal(t, http.StatusOK, code)
 	err = json.Unmarshal([]byte(res), &tree)
@@ -477,6 +502,288 @@ func TestRest_FindUserComments(t *testing.T) {
 	}
 }

+func TestRest_FindUserComments_CWE_918(t *testing.T) {
+	ts, srv, teardown := startupT(t)
+	srv.DataService.TitleExtractor = service.NewTitleExtractor(http.Client{Timeout: time.Second}, []string{"radio-t.com"}) // required for extracting the title, bad URL test
+	defer srv.DataService.TitleExtractor.Close()
+	defer teardown()
+
+	backendRequestedArbitraryServer := false
+	arbitraryServer := httptest.NewServer(http.HandlerFunc(func(_ http.ResponseWriter, r *http.Request) {
+		t.Logf("request received: %+v", r)
+		backendRequestedArbitraryServer = true
+	}))
+	defer arbitraryServer.Close()
+
+	arbitraryURLComment := store.Comment{Text: "arbitrary URL request test",
+		Locator: store.Locator{SiteID: "remark42", URL: arbitraryServer.URL}}
+
+	assert.False(t, backendRequestedArbitraryServer)
+	addComment(t, arbitraryURLComment, ts)
+	assert.False(t, backendRequestedArbitraryServer,
+		"no request is expected to the test server as it's not in the list of the allowed domains for the title extractor")
+
+	res, code := get(t, ts.URL+"/api/v1/comments?site=remark42&user=provider1_dev")
+	assert.Equal(t, http.StatusOK, code)
+
+	resp := struct {
+		Comments []store.Comment
+		Count    int
+	}{}
+
+	err := json.Unmarshal([]byte(res), &resp)
+	assert.NoError(t, err)
+	require.Equal(t, 1, len(resp.Comments), "should have 2 comments")
+
+	assert.Equal(t, "", resp.Comments[0].PostTitle, "empty from the first post")
+	assert.Equal(t, arbitraryServer.URL, resp.Comments[0].Locator.URL, "arbitrary URL provided by the request")
+}
+
+func TestPublic_FindCommentsCtrl_ConsistentCount(t *testing.T) {
+	// test that comment counting is consistent between tree and plain formats
+	ts, srv, teardown := startupT(t)
+	defer teardown()
+
+	commentLocator := store.Locator{URL: "test-url", SiteID: "remark42"}
+
+	// vote for comment multiple times
+	setScore := func(locator store.Locator, id string, val int) {
+		abs := func(x int) int {
+			if x < 0 {
+				return -x
+			}
+			return x
+		}
+		for i := 0; i < abs(val); i++ {
+			_, err := srv.DataService.Vote(service.VoteReq{
+				Locator:   locator,
+				CommentID: id,
+				// unique user ID is needed for correct counting of controversial votes
+				UserID: "user" + strconv.Itoa(val) + strconv.Itoa(i),
+				Val:    val > 0,
+			})
+			require.NoError(t, err)
+		}
+	}
+
+	// adding initial comments (8 to test-url and 1 to another-url) and voting, and delete two of comments to the first post.
+	// with sleep so that at least few millisecond pass between each comment
+	// and later we would be able to use that in "since" filter with millisecond precision
+	ids := make([]string, 9)
+	timestamps := make([]time.Time, 9)
+	c1 := store.Comment{Text: "top-level comment 1", Locator: commentLocator}
+	ids[0], timestamps[0] = addCommentGetCreatedTime(t, c1, ts)
+	// #3 by score
+	setScore(commentLocator, ids[0], 1)
+	time.Sleep(time.Millisecond * 5)
+
+	c2 := store.Comment{Text: "top-level comment 2", Locator: commentLocator}
+	ids[1], timestamps[1] = addCommentGetCreatedTime(t, c2, ts)
+	// #2 by score
+	setScore(commentLocator, ids[1], 2)
+	time.Sleep(time.Millisecond * 5)
+
+	c3 := store.Comment{Text: "second-level comment 1", ParentID: ids[0], Locator: commentLocator}
+	ids[2], timestamps[2] = addCommentGetCreatedTime(t, c3, ts)
+	// #1 by score
+	setScore(commentLocator, ids[2], 10)
+	time.Sleep(time.Millisecond * 5)
+
+	c4 := store.Comment{Text: "third-level comment 1", ParentID: ids[2], Locator: commentLocator}
+	ids[3], timestamps[3] = addCommentGetCreatedTime(t, c4, ts)
+	// #5 by score, #1 by controversy
+	setScore(commentLocator, ids[3], 4)
+	setScore(commentLocator, ids[3], -4)
+	time.Sleep(time.Millisecond * 5)
+
+	c5 := store.Comment{Text: "second-level comment 2", ParentID: ids[1], Locator: commentLocator}
+	ids[4], timestamps[4] = addCommentGetCreatedTime(t, c5, ts)
+	// #5 by score, #2 by controversy
+	setScore(commentLocator, ids[4], 2)
+	setScore(commentLocator, ids[4], -3)
+	time.Sleep(time.Millisecond * 5)
+
+	c6 := store.Comment{Text: "deleted third-level comment 2", ParentID: ids[4], Locator: commentLocator}
+	ids[5], timestamps[5] = addCommentGetCreatedTime(t, c6, ts)
+	// deleted later so not visible in site-wide requests
+	setScore(commentLocator, ids[5], 10)
+	setScore(commentLocator, ids[5], -10)
+	time.Sleep(time.Millisecond * 5)
+
+	c7 := store.Comment{Text: "top-level comment 3", Locator: commentLocator}
+	ids[6], timestamps[6] = addCommentGetCreatedTime(t, c7, ts)
+	// #6 by score, #4 by controversy
+	setScore(commentLocator, ids[6], -3)
+	setScore(commentLocator, ids[6], 1)
+	time.Sleep(time.Millisecond * 5)
+
+	c8 := store.Comment{Text: "deleted second-level comment 3", ParentID: ids[6], Locator: commentLocator}
+	ids[7], timestamps[7] = addCommentGetCreatedTime(t, c8, ts)
+	// deleted later so not visible in site-wide requests
+	setScore(commentLocator, ids[7], -20)
+
+	c9 := store.Comment{Text: "comment to post 2", Locator: store.Locator{URL: "another-url", SiteID: "remark42"}}
+	ids[8], timestamps[8] = addCommentGetCreatedTime(t, c9, ts)
+	// #7 by score
+	setScore(store.Locator{URL: "another-url", SiteID: "remark42"}, ids[8], -25)
+
+	// delete two comments bringing the total from 9 to 6
+	err := srv.DataService.Delete(commentLocator, ids[7], store.SoftDelete)
+	assert.NoError(t, err)
+	err = srv.DataService.Delete(commentLocator, ids[5], store.HardDelete)
+	assert.NoError(t, err)
+	srv.Cache.Flush(cache.FlusherRequest{})
+
+	commentLocator.URL = "readonly-test"
+	// set post without comments to read-only
+	assert.NoError(t, srv.DataService.SetReadOnly(commentLocator, true))
+
+	sinceTenSecondsAgo := strconv.FormatInt(time.Now().Add(-time.Second*10).UnixNano()/1000000, 10)
+	sinceTS := make([]string, 9)
+	formattedTS := make([]string, 9)
+	for i, created := range timestamps {
+		sinceTS[i] = strconv.FormatInt(created.UnixNano()/1000000, 10)
+		formattedTS[i] = created.Format(time.RFC3339Nano)
+	}
+	t.Logf("last timestamp: %v", timestamps[7])
+
+	testCases := []struct {
+		params       string
+		expectedBody string
+	}{
+		// test parameters url, format, since, sort
+		{"", fmt.Sprintf(`"info":{"count":7,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[8])},
+		{"url=test-url", fmt.Sprintf(`"info":{"url":"test-url","count":6,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[7])},
+		{"format=plain", fmt.Sprintf(`"info":{"count":7,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[8])},
+		{"format=plain&url=test-url", fmt.Sprintf(`"info":{"url":"test-url","count":6,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[7])},
+		{"since=" + sinceTenSecondsAgo, fmt.Sprintf(`"info":{"count":7,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[8])},
+		{"url=test-url&since=" + sinceTenSecondsAgo, fmt.Sprintf(`"info":{"url":"test-url","count":6,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[7])},
+		{"since=" + sinceTS[0], fmt.Sprintf(`"info":{"count":7,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[8])},
+		{"url=test-url&since=" + sinceTS[0], fmt.Sprintf(`"info":{"url":"test-url","count":6,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[7])},
+		{"since=" + sinceTS[1], fmt.Sprintf(`"info":{"count":6,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[8])},
+		{"url=test-url&since=" + sinceTS[1], fmt.Sprintf(`"info":{"url":"test-url","count":5,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[7])},
+		{"since=" + sinceTS[4], fmt.Sprintf(`"info":{"count":3,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[8])},
+		{"url=test-url&since=" + sinceTS[4], fmt.Sprintf(`"info":{"url":"test-url","count":2,"count_left":0,"first_time":%q,"last_time":%q}`, formattedTS[0], formattedTS[7])},
+		{"format=tree", `"info":{"count":7`},
+		{"format=tree&url=test-url", `"info":{"url":"test-url","count":6`},
+		{"format=tree&sort=+time", `"info":{"count":7`},
+		{"format=tree&url=test-url&sort=+time", `"info":{"url":"test-url","count":6`},
+		{"format=tree&sort=-score", `"info":{"count":7`},
+		{"format=tree&url=test-url&sort=-score", `"info":{"url":"test-url","count":6`},
+		{"sort=+time", fmt.Sprintf(`"score":-25,"vote":0,"time":%q}],"info":{"count":7`, formattedTS[8])},
+		{"sort=-time", fmt.Sprintf(`"score":1,"vote":0,"time":%q}],"info":{"count":7`, formattedTS[0])},
+		{"sort=+score", fmt.Sprintf(`"score":10,"vote":0,"time":%q}],"info":{"count":7`, formattedTS[2])},
+		{"sort=+score&url=test-url", fmt.Sprintf(`"score":10,"vote":0,"time":%q}],"info":{"url":"test-url","count":6`, formattedTS[2])},
+		{"sort=-score", fmt.Sprintf(`"score":-25,"vote":0,"time":%q}],"info":{"count":7`, formattedTS[8])},
+		{"sort=-score&url=test-url", fmt.Sprintf(`"score":-2,"vote":0,"controversy":1.5874010519681994,"time":%q}],"info":{"url":"test-url","count":6`, formattedTS[6])},
+		{"sort=-time&since=" + sinceTS[4], fmt.Sprintf(`"score":-1,"vote":0,"controversy":2.924017738212866,"time":%q}],"info":{"count":3`, formattedTS[4])},
+		{"sort=-score&since=" + sinceTS[3], fmt.Sprintf(`"score":-25,"vote":0,"time":%q}],"info":{"count":4`, formattedTS[8])},
+		{"sort=-score&url=test-url&since=" + sinceTS[3], fmt.Sprintf(`"score":-2,"vote":0,"controversy":1.5874010519681994,"time":%q}],"info":{"url":"test-url","count":3`, formattedTS[6])},
+		{"sort=+controversy&url=test-url&since=" + sinceTS[5], fmt.Sprintf(`"score":-2,"vote":0,"controversy":1.5874010519681994,"time":%q}],"info":{"url":"test-url","count":1`, formattedTS[6])},
+		// three comments of which last one deleted and doesn't have controversy so returned last
+		{"sort=-controversy&url=test-url&since=" + sinceTS[5], fmt.Sprintf(`"score":0,"vote":0,"time":%q,"delete":true}],"info":{"url":"test-url","count":1`, formattedTS[7])},
+		// test readonly status for the post without comments
+		{"url=readonly-test", `"info":{"count":0,"count_left":0,"read_only":true`},
+		{"format=tree&url=readonly-test", `"info":{"count":0,"count_left":0,"read_only":true`},
+
+		// test parameters limit, offset_id for format=plain
+		{"limit=bad", `{"code":1,"details":"bad limit value","error":"strconv.Atoi: parsing \"bad\": invalid syntax"}`},
+		{"offset_id=bad", `{"code":1,"details":"bad offset_id value","error":"invalid UUID length: 3"}`},
+		{"limit=2", `"info":{"count":7,"count_left":5,"last_comment":"` + ids[1]},
+		{"limit=6", `"info":{"count":7,"count_left":1,"last_comment":"` + ids[6]},
+		{"limit=7", `"info":{"count":7,"count_left":0,"last_comment":"` + ids[8]},
+		{"limit=2&url=test-url", `"info":{"url":"test-url","count":6,"count_left":6,"last_comment":"` + ids[1]},
+		{"limit=6&url=test-url", `"info":{"url":"test-url","count":6,"count_left":2,"last_comment":"` + ids[5]},
+		{"limit=7&url=test-url", `"info":{"url":"test-url","count":6,"count_left":1,"last_comment":"` + ids[6]},
+		{fmt.Sprintf("limit=2&offset_id=%s", ids[2]), `"info":{"count":7,"count_left":2,"last_comment":"` + ids[4]},
+		{fmt.Sprintf("limit=2&offset_id=%s", ids[3]), `"info":{"count":7,"count_left":1,"last_comment":"` + ids[6]},
+		{fmt.Sprintf("limit=2&offset_id=%s", ids[4]), `"info":{"count":7,"count_left":0`},
+		{fmt.Sprintf("limit=1&offset_id=%s", ids[6]), `"info":{"count":7,"count_left":0`},
+		{fmt.Sprintf("limit=2&offset_id=%s", ids[8]), `"info":{"count":7,"count_left":0`},
+		{fmt.Sprintf("limit=2&url=test-url&offset_id=%s", ids[2]), `"info":{"url":"test-url","count":6,"count_left":3,"last_comment":"` + ids[4]},
+		{fmt.Sprintf("limit=2&url=test-url&offset_id=%s", ids[3]), `"info":{"url":"test-url","count":6,"count_left":2,"last_comment":"` + ids[5]},
+		{fmt.Sprintf("limit=2&url=test-url&offset_id=%s", ids[4]), `"info":{"url":"test-url","count":6,"count_left":1,"last_comment":"` + ids[6]},
+		{fmt.Sprintf("limit=1&url=test-url&offset_id=%s", ids[6]), `"info":{"url":"test-url","count":6,"count_left":0,"last_comment":"` + ids[7]},
+		{fmt.Sprintf("limit=2&url=test-url&offset_id=%s", ids[8]), `"info":{"url":"test-url","count":6,"count_left":6,`},
+		// deleted comment, offset is ignored in site-wide request but not for particular URL
+		{fmt.Sprintf("limit=2&offset_id=%s", ids[5]), `"info":{"count":7,"count_left":5,"last_comment":"` + ids[1]},
+		{fmt.Sprintf("limit=2&url=test-url&offset_id=%s", ids[5]), `"info":{"url":"test-url","count":6,"count_left":0,"last_comment":"` + ids[7]},
+		// non-existing comment, offset is ignored, deleted comments included into request with "url"
+		{fmt.Sprintf("limit=1&offset_id=%s", uuid.New().String()), `"info":{"count":7,"count_left":6,"last_comment":"` + ids[0]},
+		{fmt.Sprintf("limit=1&url=test-url&offset_id=%s", uuid.New().String()), `"info":{"url":"test-url","count":6,"count_left":7,"last_comment":"` + ids[0]},
+		// since is ignored for tree format, so we test it only for plain
+		{"limit=6&since=" + sinceTenSecondsAgo, `"info":{"count":7,"count_left":1,"last_comment":"` + ids[6]},
+		{"limit=1&since=" + sinceTS[4], `"info":{"count":3,"count_left":2,"last_comment":"` + ids[4]},
+		{"limit=6&url=test-url&since=" + sinceTenSecondsAgo, `"info":{"url":"test-url","count":6,"count_left":2,"last_comment":"` + ids[5]},
+		{"limit=1&url=test-url&since=" + sinceTS[4], `"info":{"url":"test-url","count":2,"count_left":3,"last_comment":"` + ids[4]},
+		// start with deleted comment timestamp
+		{"limit=1&since=" + sinceTS[5], `"info":{"count":2,"count_left":1,"last_comment":"` + ids[6]},
+		{"limit=1&since=" + sinceTS[6], `"info":{"count":2,"count_left":1,"last_comment":"` + ids[6]},
+		{"limit=1&url=test-url&since=" + sinceTS[5], `"info":{"url":"test-url","count":1,"count_left":2,"last_comment":"` + ids[5]},
+		{"limit=1&url=test-url&since=" + sinceTS[6], `"info":{"url":"test-url","count":1,"count_left":1,"last_comment":"` + ids[6]},
+		// test sort
+		{"limit=1&sort=+time&url=test-url", `"info":{"url":"test-url","count":6,"count_left":7,"last_comment":"` + ids[0]},
+		{"limit=1&sort=-time&url=test-url", `"info":{"url":"test-url","count":6,"count_left":7,"last_comment":"` + ids[7]},
+		{"limit=1&sort=+score&url=test-url", `"info":{"url":"test-url","count":6,"count_left":7,"last_comment":"` + ids[6]},
+		{"limit=1&sort=-score&url=test-url", `"info":{"url":"test-url","count":6,"count_left":7,"last_comment":"` + ids[2]},
+		{"limit=1&sort=+controversy&url=test-url", `"info":{"url":"test-url","count":6,"count_left":7,"last_comment":"` + ids[0]},
+		{"limit=1&sort=-controversy&url=test-url", `"info":{"url":"test-url","count":6,"count_left":7,"last_comment":"` + ids[3]},
+
+		// test parameters limit, offset_id for format=tree
+		{"format=tree&limit=bad", `{"code":1,"details":"bad limit value","error":"strconv.Atoi: parsing \"bad\": invalid syntax"}`},
+		{"format=tree&offset_id=bad", `{"code":1,"details":"bad offset_id value","error":"invalid UUID length: 3"}`},
+		{"format=tree&limit=2", `"info":{"count":7,"count_left":4,"last_comment":"` + ids[0]},
+		{"format=tree&limit=6", `"info":{"count":7,"count_left":2,"last_comment":"` + ids[1]},
+		{"format=tree&limit=7", `"info":{"count":7,"count_left":1,"last_comment":"` + ids[6]},
+		{"format=tree&url=test-url&limit=2", `"info":{"url":"test-url","count":6,"count_left":3,"last_comment":"` + ids[0]},
+		{"format=tree&url=test-url&limit=6", `"info":{"url":"test-url","count":6,"count_left":1,"last_comment":"` + ids[1]},
+		{"format=tree&url=test-url&limit=7", `"info":{"url":"test-url","count":6,"count_left":0,"last_comment":"` + ids[6]},
+		// start after first top-level comment
+		{fmt.Sprintf("format=tree&limit=2&offset_id=%s", ids[0]), `"info":{"count":7,"count_left":2,"last_comment":"` + ids[1]},
+		{fmt.Sprintf("format=tree&url=test-url&limit=2&offset_id=%s", ids[0]), `"info":{"url":"test-url","count":6,"count_left":1,"last_comment":"` + ids[1]},
+		// start after second top-level comment
+		{fmt.Sprintf("format=tree&limit=2&offset_id=%s", ids[1]), `"info":{"count":7,"count_left":1,"last_comment":"` + ids[6]},
+		{fmt.Sprintf("format=tree&url=test-url&limit=2&offset_id=%s", ids[1]), `"info":{"url":"test-url","count":6,"count_left":0,"last_comment":"` + ids[6]},
+		// start after third top-level comment, so expect comment to post 2, or no comments on post 1 if "url" is set
+		{fmt.Sprintf("format=tree&limit=1&offset_id=%s", ids[6]), `"info":{"count":7,"count_left":0,"last_comment":"` + ids[8]},
+		{fmt.Sprintf("format=tree&url=test-url&limit=1&offset_id=%s", ids[6]), `"info":{"url":"test-url","count":6,"count_left":0`},
+		// non-root comment IDs or non-existing IDs are ignored
+		{fmt.Sprintf("format=tree&limit=2&offset_id=%s", ids[2]), `"info":{"count":7,"count_left":4,"last_comment":"` + ids[0]},
+		{fmt.Sprintf("format=tree&limit=2&offset_id=%s", ids[3]), `"info":{"count":7,"count_left":4,"last_comment":"` + ids[0]},
+		{fmt.Sprintf("format=tree&limit=2&offset_id=%s", ids[4]), `"info":{"count":7,"count_left":4,"last_comment":"` + ids[0]},
+		{fmt.Sprintf("format=tree&limit=2&offset_id=%s", ids[7]), `"info":{"count":7,"count_left":4,"last_comment":"` + ids[0]},
+		{fmt.Sprintf("format=tree&limit=1&offset_id=%s", uuid.New().String()), `"info":{"count":7,"count_left":4,"last_comment":"` + ids[0]},
+		{fmt.Sprintf("format=tree&url=test-url&limit=2&offset_id=%s", ids[2]), `"info":{"url":"test-url","count":6,"count_left":3,"last_comment":"` + ids[0]},
+		{fmt.Sprintf("format=tree&url=test-url&limit=2&offset_id=%s", ids[3]), `"info":{"url":"test-url","count":6,"count_left":3,"last_comment":"` + ids[0]},
+		{fmt.Sprintf("format=tree&url=test-url&limit=2&offset_id=%s", ids[4]), `"info":{"url":"test-url","count":6,"count_left":3,"last_comment":"` + ids[0]},
+		{fmt.Sprintf("format=tree&url=test-url&limit=2&offset_id=%s", ids[7]), `"info":{"url":"test-url","count":6,"count_left":3,"last_comment":"` + ids[0]},
+		{fmt.Sprintf("format=tree&url=test-url&limit=1&offset_id=%s", uuid.New().String()), `"info":{"url":"test-url","count":6,"count_left":3,"last_comment":"` + ids[0]},
+		// test sort
+		{"format=tree&limit=1&sort=+time&url=test-url", `"info":{"url":"test-url","count":6,"count_left":3,"last_comment":"` + ids[0]},
+		{"format=tree&limit=1&sort=-time&url=test-url", `"info":{"url":"test-url","count":6,"count_left":5,"last_comment":"` + ids[6]},
+		{"format=tree&limit=1&sort=+score&url=test-url", `"info":{"url":"test-url","count":6,"count_left":5,"last_comment":"` + ids[6]},
+		{"format=tree&limit=1&sort=-score&url=test-url", `"info":{"url":"test-url","count":6,"count_left":4,"last_comment":"` + ids[1]},
+		{"format=tree&limit=1&sort=+controversy&url=test-url", `"info":{"url":"test-url","count":6,"count_left":3,"last_comment":"` + ids[0]},
+		{"format=tree&limit=1&sort=-controversy&url=test-url", `"info":{"url":"test-url","count":6,"count_left":5,"last_comment":"` + ids[6]},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.params, func(t *testing.T) {
+			url := fmt.Sprintf(ts.URL+"/api/v1/find?site=remark42&%s", tc.params)
+			body, code := get(t, url)
+			expectedStatus := http.StatusOK
+			if strings.Contains(tc.params, "=bad") {
+				expectedStatus = http.StatusBadRequest
+			}
+			assert.Equal(t, expectedStatus, code)
+			assert.Contains(t, body, tc.expectedBody)
+			t.Log(body)
+			// prevent hit limiter from engaging
+			time.Sleep(80 * time.Millisecond)
+		})
+	}
+}
+
 func TestRest_UserInfo(t *testing.T) {
 	ts, _, teardown := startupT(t)
 	defer teardown()
@@ -627,7 +934,7 @@ func TestRest_Config(t *testing.T) {
 	err := json.Unmarshal([]byte(body), &j)
 	assert.NoError(t, err)
 	assert.Equal(t, 300.0, j["edit_duration"])
-	assert.EqualValues(t, []interface{}{"a1", "a2"}, j["admins"])
+	assert.EqualValues(t, []any{"a1", "a2"}, j["admins"])
 	assert.Equal(t, "admin@remark-42.com", j["admin_email"])
 	assert.Equal(t, 4000.0, j["max_comment_size"])
 	assert.Equal(t, -5.0, j["low_score"])
@@ -725,3 +1032,189 @@ func TestRest_Robots(t *testing.T) {
 		"Allow: /api/v1/list\nAllow: /api/v1/config\nAllow: /api/v1/user\nAllow: /api/v1/img\n"+
 		"Allow: /api/v1/avatar\nAllow: /api/v1/picture\n", body)
 }
+
+// TestRest_LoadPictureRejectsPathTraversal reproduces the unauthenticated path-traversal
+// vulnerability in GET /api/v1/picture/{user}/{id}. Before the fix, the handler concatenated
+// the URL params verbatim into a filesystem path via path.Join, so a request like
+// `/api/v1/picture/../remark.db` would resolve to `<base>/../remark.db`, escaping the image
+// directory. Even when the file did not exist (default Partitions=100 mitigates direct hits),
+// the FS error message leaked the constructed internal path back to the unauthenticated caller.
+func TestRest_LoadPictureRejectsPathTraversal(t *testing.T) {
+	ts, _, teardown := startupT(t)
+	defer teardown()
+
+	cases := []struct {
+		name string
+		path string
+	}{
+		{name: "dotdot in user segment", path: "/api/v1/picture/../remark.db"},
+		{name: "dotdot in id segment", path: "/api/v1/picture/dev_user/..%2Fremark.db"},
+		{name: "encoded dotdot in user segment", path: "/api/v1/picture/%2E%2E/remark.db"},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			req, err := http.NewRequest(http.MethodGet, ts.URL+c.path, http.NoBody)
+			require.NoError(t, err)
+			resp, err := http.DefaultClient.Do(req)
+			require.NoError(t, err)
+			defer func() { _ = resp.Body.Close() }()
+
+			assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
+			body, err := io.ReadAll(resp.Body)
+			require.NoError(t, err)
+			s := string(body)
+			assert.NotContains(t, s, "..", "error body must not echo traversal marker")
+			assert.NotContains(t, s, "remark.db", "error body must not echo attacker-supplied filename")
+			assert.NotContains(t, s, "no such file", "error body must not leak filesystem state")
+			assert.NotContains(t, s, "/var/", "error body must not leak internal filesystem path")
+		})
+	}
+}
+
+// TestRest_LoadPictureRejectsControlCharsInSegment makes sure a CRLF / tab / NUL
+// in the URL segment is rejected by safePictureSegment. Without the rejection
+// the [WARN] log line constructed from %q-formatted segments would still be
+// safe (Go's %q escapes control chars), but a future log change to %s would
+// turn this into log forgery — and no legitimate picture id ever needs control
+// characters, so the right place to slam the door is in the validator.
+func TestRest_LoadPictureRejectsControlCharsInSegment(t *testing.T) {
+	ts, _, teardown := startupT(t)
+	defer teardown()
+
+	cases := []struct {
+		name string
+		path string
+	}{
+		{name: "lf in user segment", path: "/api/v1/picture/dev%0Auser/abc.png"},
+		{name: "cr in user segment", path: "/api/v1/picture/dev%0Duser/abc.png"},
+		{name: "tab in user segment", path: "/api/v1/picture/dev%09user/abc.png"},
+		{name: "lf in id segment", path: "/api/v1/picture/dev_user/abc%0A.png"},
+		{name: "nul in id segment", path: "/api/v1/picture/dev_user/abc%00.png"},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			req, err := http.NewRequest(http.MethodGet, ts.URL+c.path, http.NoBody)
+			require.NoError(t, err)
+			resp, err := http.DefaultClient.Do(req)
+			require.NoError(t, err)
+			defer func() { _ = resp.Body.Close() }()
+
+			assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
+			body, err := io.ReadAll(resp.Body)
+			require.NoError(t, err)
+			s := string(body)
+			assert.Contains(t, s, "invalid picture id", "must reject as invalid input, not fall through to storage")
+			assert.NotContains(t, s, "no such file", "must not reach the filesystem")
+		})
+	}
+}
+
+// TestRest_LoadPictureDefenseHeaders saves a real PNG via the standard upload handler
+// and asserts that GET /api/v1/picture/{user}/{id} carries the layered defense headers
+// (strict CSP, nosniff, Content-Disposition with filename) and that the strict ETag
+// matcher does not 304 on a substring-of-the-real-etag (the pre-fix matcher would).
+func TestRest_LoadPictureDefenseHeaders(t *testing.T) {
+	ts, _, teardown := startupT(t)
+	defer teardown()
+
+	// upload a real PNG via /api/v1/picture
+	bodyBuf := &bytes.Buffer{}
+	bodyWriter := multipart.NewWriter(bodyBuf)
+	fileWriter, err := bodyWriter.CreateFormFile("file", "picture.png")
+	require.NoError(t, err)
+	_, err = io.Copy(fileWriter, gopherPNG())
+	require.NoError(t, err)
+	contentType := bodyWriter.FormDataContentType()
+	require.NoError(t, bodyWriter.Close())
+
+	client := http.Client{}
+	defer client.CloseIdleConnections()
+	req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s/api/v1/picture?site=remark42", ts.URL), bodyBuf)
+	require.NoError(t, err)
+	req.Header.Add("Content-Type", contentType)
+	req.Header.Add("X-JWT", devToken)
+	resp, err := client.Do(req)
+	require.NoError(t, err)
+	require.Equal(t, http.StatusOK, resp.StatusCode)
+	body, err := io.ReadAll(resp.Body)
+	require.NoError(t, err)
+	require.NoError(t, resp.Body.Close())
+	m := map[string]string{}
+	require.NoError(t, json.Unmarshal(body, &m))
+	require.NotEmpty(t, m["id"])
+
+	// fetch the picture and assert defense headers
+	resp, err = http.Get(fmt.Sprintf("%s/api/v1/picture/%s", ts.URL, m["id"]))
+	require.NoError(t, err)
+	defer resp.Body.Close()
+	require.Equal(t, http.StatusOK, resp.StatusCode)
+	assert.Equal(t, "default-src 'none'; sandbox; frame-ancestors 'none'",
+		resp.Header.Get("Content-Security-Policy"))
+	assert.Equal(t, "nosniff", resp.Header.Get("X-Content-Type-Options"))
+	assert.Equal(t, `inline; filename="image"`, resp.Header.Get("Content-Disposition"))
+	assert.Equal(t, "image/png", resp.Header.Get("Content-Type"))
+	realEtag := resp.Header.Get("Etag")
+	require.NotEmpty(t, realEtag)
+
+	// strict matcher: an If-None-Match value that CONTAINS the real etag as a substring
+	// but is not equal to it must NOT trigger 304. The pre-fix matcher used
+	// strings.Contains(header, etag) and would have returned true here.
+	require.True(t, len(realEtag) > 4)
+	substringMatch := "prefix-" + realEtag + "-suffix"
+	req2, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/api/v1/picture/%s", ts.URL, m["id"]), http.NoBody)
+	require.NoError(t, err)
+	req2.Header.Set("If-None-Match", substringMatch)
+	resp2, err := client.Do(req2)
+	require.NoError(t, err)
+	defer resp2.Body.Close()
+	assert.Equal(t, http.StatusOK, resp2.StatusCode,
+		"strict etag matcher must NOT 304 when real etag appears only as a substring of If-None-Match; got %q vs real %q", substringMatch, realEtag)
+
+	// sanity: the exact real etag DOES validate
+	req3, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/api/v1/picture/%s", ts.URL, m["id"]), http.NoBody)
+	require.NoError(t, err)
+	req3.Header.Set("If-None-Match", realEtag)
+	resp3, err := client.Do(req3)
+	require.NoError(t, err)
+	defer resp3.Body.Close()
+	assert.Equal(t, http.StatusNotModified, resp3.StatusCode, "exact etag must round-trip as 304")
+}
+
+// TestRest_LoadPictureRejectsNonImage proves the /picture/ handler rejects bytes that
+// don't sniff as a real image — even when retrieved successfully from the image store.
+// Uses a StoreMock so we can return arbitrary attacker bytes for a valid-looking id.
+func TestRest_LoadPictureRejectsNonImage(t *testing.T) {
+	htmlBody := []byte("<html><body><script>alert(document.domain)</script></body></html>")
+
+	imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) {
+		return htmlBody, nil
+	}}
+	// minimal public struct on purpose: the reject path only exercises imageService.Load
+	// (other fields like dataService, cache, commentFormatter are not touched here).
+	p := &public{imageService: image.NewService(&imageStore, image.ServiceParams{})}
+
+	router := chi.NewRouter()
+	router.Get("/api/v1/picture/{user}/{id}", p.loadPictureCtrl)
+	ts := httptest.NewServer(router)
+	defer ts.Close()
+
+	resp, err := http.Get(ts.URL + "/api/v1/picture/dev_user/abc.png")
+	require.NoError(t, err)
+	body, err := io.ReadAll(resp.Body)
+	require.NoError(t, err)
+	require.NoError(t, resp.Body.Close())
+
+	assert.Equal(t, http.StatusUnsupportedMediaType, resp.StatusCode,
+		"non-image bytes must be rejected as 415")
+	assert.False(t, strings.HasPrefix(resp.Header.Get("Content-Type"), "text/html"),
+		"reject response must not be text/html; got %q", resp.Header.Get("Content-Type"))
+	assert.NotContains(t, string(body), "<script>",
+		"attacker payload must not be echoed back")
+	assert.Equal(t, "no-store", resp.Header.Get("Cache-Control"),
+		"rejection path must not be cacheable")
+	// defense headers still present on the reject path
+	assert.Equal(t, "default-src 'none'; sandbox; frame-ancestors 'none'",
+		resp.Header.Get("Content-Security-Policy"))
+	assert.Equal(t, "nosniff", resp.Header.Get("X-Content-Type-Options"))
+	assert.Equal(t, `inline; filename="image"`, resp.Header.Get("Content-Disposition"))
+}
@@ -16,11 +16,11 @@ import (
 	"testing"
 	"time"

-	"github.com/go-pkgz/auth"
-	"github.com/go-pkgz/auth/avatar"
-	"github.com/go-pkgz/auth/provider"
-	"github.com/go-pkgz/auth/token"
-	cache "github.com/go-pkgz/lcw"
+	"github.com/go-pkgz/auth/v2"
+	"github.com/go-pkgz/auth/v2/avatar"
+	"github.com/go-pkgz/auth/v2/provider"
+	"github.com/go-pkgz/auth/v2/token"
+	cache "github.com/go-pkgz/lcw/v2"
 	R "github.com/go-pkgz/rest"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -128,7 +128,7 @@ func TestRest_RunStaticSSLMode(t *testing.T) {

 	client := http.Client{
 		// prevent http redirect
-		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+		CheckRedirect: func(*http.Request, []*http.Request) error {
 			return http.ErrUseLastResponse
 		},

@@ -178,7 +178,7 @@ func TestRest_RunAutocertModeHTTPOnly(t *testing.T) {

 	client := http.Client{
 		// prevent http redirect
-		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+		CheckRedirect: func(*http.Request, []*http.Request) error {
 			return http.ErrUseLastResponse
 		},
 	}
@@ -194,7 +194,7 @@ func TestRest_RunAutocertModeHTTPOnly(t *testing.T) {
 }

 func TestRest_rejectAnonUser(t *testing.T) {
-	ts := httptest.NewServer(fakeAuth(rejectAnonUser(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	ts := httptest.NewServer(fakeAuth(rejectAnonUser(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
 		fmt.Fprintln(w, "Hello")
 	}))))
 	defer ts.Close()
@@ -227,7 +227,6 @@ func Test_URLKey(t *testing.T) {
 	}

 	for i, tt := range tbl {
-		tt := tt
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			r, err := http.NewRequest("GET", tt.url, http.NoBody)
 			require.NoError(t, err)
@@ -252,7 +251,6 @@ func Test_URLKeyWithUser(t *testing.T) {
 	}

 	for i, tt := range tbl {
-		tt := tt
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			r, err := http.NewRequest("GET", tt.url, http.NoBody)
 			require.NoError(t, err)
@@ -279,7 +277,6 @@ func TestRest_parseError(t *testing.T) {
 	}

 	for n, tt := range tbl {
-		tt := tt
 		t.Run(strconv.Itoa(n), func(t *testing.T) {
 			res := parseError(tt.err, rest.ErrInternal)
 			assert.Equal(t, tt.res, res)
@@ -302,12 +299,11 @@ func TestRest_cacheControl(t *testing.T) {
 	}

 	for i, tt := range tbl {
-		tt := tt
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			req := httptest.NewRequest("GET", tt.url, http.NoBody)
 			w := httptest.NewRecorder()

-			h := cacheControl(tt.exp, tt.version)(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
+			h := cacheControl(tt.exp, tt.version)(http.HandlerFunc(func(http.ResponseWriter, *http.Request) {}))
 			h.ServeHTTP(w, req)
 			resp := w.Result()
 			assert.Equal(t, http.StatusOK, resp.StatusCode)
@@ -320,30 +316,96 @@ func TestRest_cacheControl(t *testing.T) {
 }

 func TestRest_frameAncestors(t *testing.T) {
-	tbl := []struct {
-		hosts  []string
-		header string
-	}{
-		{[]string{"http://example.com"}, "frame-ancestors http://example.com;"},
-		{[]string{}, ""},
-		{[]string{"http://example.com", "http://example2.com"}, "frame-ancestors http://example.com http://example2.com;"},
-	}
+	ts, _, teardown := startupT(t, func(o *Rest) {
+		o.AllowedAncestors = []string{"'self'", "https://example.com"}
+	})

-	for i, tt := range tbl {
-		tt := tt
-		t.Run(strconv.Itoa(i), func(t *testing.T) {
-			req := httptest.NewRequest("GET", "http://example.com", http.NoBody)
-			w := httptest.NewRecorder()
+	// test case with frame-ancestors
+	client := http.Client{}
+	resp, err := client.Get(ts.URL + "/web/index.html")
+	require.NoError(t, err)
+	defer resp.Body.Close()
+	assert.Equal(t, http.StatusOK, resp.StatusCode)
+	assert.Contains(t, resp.Header.Get("Content-Security-Policy"), "frame-ancestors 'self' https://example.com;")
+	teardown()

-			h := frameAncestors(tt.hosts)(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
-			h.ServeHTTP(w, req)
-			resp := w.Result()
-			assert.Equal(t, http.StatusOK, resp.StatusCode)
-			assert.NoError(t, resp.Body.Close())
-			t.Logf("%+v", resp.Header)
-			assert.Equal(t, tt.header, resp.Header.Get("Content-Security-Policy"))
-		})
-	}
+	// test case without frame-ancestors
+	ts, _, teardown = startupT(t, func(srv *Rest) {
+		srv.AllowedAncestors = []string{}
+	})
+	defer teardown()
+	resp, err = client.Get(ts.URL + "/web/index.html")
+	require.NoError(t, err)
+	defer resp.Body.Close()
+	assert.Equal(t, http.StatusOK, resp.StatusCode)
+	assert.Contains(t, resp.Header.Get("Content-Security-Policy"), "frame-ancestors *;")
+}
+
+// TestRest_apiCSP locks in that /api/v1/* responses get a strict default-src 'none'
+// override regardless of what the global CSP allows. The widget HTML pages
+// (/web/*.html) still get the global CSP (with 'unsafe-inline' for bootstrap),
+// so the test asserts the two policies diverge across origins.
+func TestRest_apiCSP(t *testing.T) {
+	ts, _, teardown := startupT(t)
+	defer teardown()
+	client := http.Client{}
+
+	// JSON API endpoint — must carry the strict policy
+	resp, err := client.Get(ts.URL + "/api/v1/config")
+	require.NoError(t, err)
+	defer resp.Body.Close()
+	csp := resp.Header.Get("Content-Security-Policy")
+	assert.Contains(t, csp, "default-src 'none'",
+		"API responses must override the global CSP with default-src 'none'; got %q", csp)
+	assert.Contains(t, csp, "sandbox", "API CSP must include sandbox; got %q", csp)
+	assert.NotContains(t, csp, "'unsafe-inline'",
+		"API CSP must not allow inline scripts/styles; got %q", csp)
+
+	// RSS/XML endpoint — same strict policy, and the XML response itself must still be served
+	respRSS, err := client.Get(ts.URL + "/api/v1/rss/site?site=remark42")
+	require.NoError(t, err)
+	defer respRSS.Body.Close()
+	assert.Equal(t, http.StatusOK, respRSS.StatusCode, "RSS must still respond OK under strict CSP")
+	cspRSS := respRSS.Header.Get("Content-Security-Policy")
+	assert.Contains(t, cspRSS, "default-src 'none'", "RSS responses must carry the strict API CSP")
+	assert.Contains(t, cspRSS, "sandbox", "RSS CSP must include sandbox")
+
+	// widget HTML — must keep the global CSP (unchanged, lax to support inline bootstrap)
+	resp2, err := client.Get(ts.URL + "/web/index.html")
+	require.NoError(t, err)
+	defer resp2.Body.Close()
+	csp2 := resp2.Header.Get("Content-Security-Policy")
+	assert.Contains(t, csp2, "'unsafe-inline'",
+		"widget HTML CSP must keep unsafe-inline for bootstrap; got %q", csp2)
+}
+
+// check CSP, img-src should be 'self' with proxy enabled and * without it
+func TestRest_securityHeaders(t *testing.T) {
+	ts, _, teardown := startupT(t)
+
+	// with proxy disabled
+	client := http.Client{}
+	resp, err := client.Get(ts.URL + "/web/index.html")
+	require.NoError(t, err)
+	defer resp.Body.Close()
+	assert.Equal(t, http.StatusOK, resp.StatusCode)
+	assert.Contains(t, resp.Header.Get("Content-Security-Policy"), "img-src *;")
+	assert.Equal(t, "nosniff", resp.Header.Get("X-Content-Type-Options"))
+	assert.Equal(t, "strict-origin-when-cross-origin", resp.Header.Get("Referrer-Policy"))
+	teardown()
+
+	// check CSP with proxy enabled
+	ts, _, teardown = startupT(t, func(srv *Rest) {
+		srv.ExternalImageProxy = true
+	})
+	defer teardown()
+	resp, err = client.Get(ts.URL + "/web/index.html")
+	require.NoError(t, err)
+	defer resp.Body.Close()
+	assert.Equal(t, http.StatusOK, resp.StatusCode)
+	assert.Contains(t, resp.Header.Get("Content-Security-Policy"), "img-src 'self';")
+	assert.Equal(t, "nosniff", resp.Header.Get("X-Content-Type-Options"))
+	assert.Equal(t, "strict-origin-when-cross-origin", resp.Header.Get("Referrer-Policy"))
 }

 func TestRest_subscribersOnly(t *testing.T) {
@@ -364,14 +426,13 @@ func TestRest_subscribersOnly(t *testing.T) {
 	}

 	for i, tt := range tbl {
-		tt := tt
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			req := httptest.NewRequest("GET", "http://example.com", http.NoBody)
 			if tt.setUser {
 				req = token.SetUserInfo(req, tt.user)
 			}
 			w := httptest.NewRecorder()
-			h := subscribersOnly(tt.subsOnly)(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
+			h := subscribersOnly(tt.subsOnly)(http.HandlerFunc(func(http.ResponseWriter, *http.Request) {}))
 			h.ServeHTTP(w, req)
 			resp := w.Result()
 			assert.Equal(t, tt.status, resp.StatusCode)
@@ -403,7 +464,7 @@ func Test_validEmailAuth(t *testing.T) {
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			req := httptest.NewRequest("GET", "http://example.com"+tt.req, http.NoBody)
 			w := httptest.NewRecorder()
-			h := validEmailAuth()(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
+			h := validEmailAuth()(http.HandlerFunc(func(http.ResponseWriter, *http.Request) {}))
 			h.ServeHTTP(w, req)
 			resp := w.Result()
 			assert.Equal(t, tt.status, resp.StatusCode)
@@ -414,7 +475,7 @@ func Test_validEmailAuth(t *testing.T) {

 // randomPath pick a file or folder name which is not in use for sure
 func randomPath(tempDir, basename, suffix string) (string, error) {
-	for i := 0; i < 10; i++ {
+	for range 10 {
 		fname := fmt.Sprintf("/%s/%s-%d%s", tempDir, basename, rand.Int31(), suffix)
 		fmt.Printf("fname %q", fname)
 		_, err := os.Stat(fname)
@@ -438,7 +499,7 @@ func startupT(t *testing.T, srvHook ...func(srv *Rest)) (ts *httptest.Server, sr
 	b, err := engine.NewBoltDB(bolt.Options{}, engine.BoltSite{FileName: testDB, SiteID: "remark42"})
 	require.NoError(t, err)

-	memCache := cache.NewScache(cache.NewNopCache())
+	memCache := cache.NewScache[[]byte](cache.NewNopCache[[]byte]())

 	astore := adminstore.NewStaticStore("123456", []string{"remark42"}, []string{"a1", "a2"}, "admin@remark-42.com")
 	restrictedWordsMatcher := service.NewRestrictedWordsMatcher(service.StaticRestrictedWordsLister{Words: []string{"duck"}})
@@ -458,7 +519,7 @@ func startupT(t *testing.T, srvHook ...func(srv *Rest)) (ts *httptest.Server, sr
 		DataService: dataStore,
 		Authenticator: auth.NewService(auth.Opts{
 			AdminPasswd:  "password",
-			SecretReader: token.SecretFunc(func(aud string) (string, error) { return "secret", nil }),
+			SecretReader: token.SecretFunc(func(string) (string, error) { return "secret", nil }),
 			AvatarStore:  avatar.NewLocalFS(tmp + "/ava-remark42"),
 		}),
 		Cache:     memCache,
@@ -487,15 +548,16 @@ func startupT(t *testing.T, srvHook ...func(srv *Rest)) (ts *httptest.Server, sr
 			Cache:             memCache,
 			KeyStore:          astore,
 		},
-		NotifyService: notify.NopService,
-		EmojiEnabled:  true,
+		NotifyService:    notify.NopService,
+		EmojiEnabled:     true,
+		openRouteLimiter: 100,
 	}
 	srv.ScoreThresholds.Low, srv.ScoreThresholds.Critical = -5, -10

 	// add some providers. Needed because we don't allow users with unlisted providers to authenticate
 	providers := []string{"provider1", "anonymous", "github", "email"}
 	for _, p := range providers {
-		srv.Authenticator.AddDirectProvider(p, provider.CredCheckerFunc(func(user, password string) (ok bool, err error) {
+		srv.Authenticator.AddDirectProvider(p, provider.CredCheckerFunc(func(_, _ string) (ok bool, err error) {
 			return true, nil
 		}))
 	}
@@ -504,7 +566,8 @@ func startupT(t *testing.T, srvHook ...func(srv *Rest)) (ts *httptest.Server, sr
 		h(srv)
 	}

-	ts = httptest.NewServer(srv.routes())
+	routes := srv.routes()
+	ts = httptest.NewServer(routes)

 	teardown = func() {
 		ts.Close()
@@ -599,13 +662,17 @@ func post(t *testing.T, url, body string) (*http.Response, error) {
 	return client.Do(req)
 }

-func addComment(t *testing.T, c store.Comment, ts *httptest.Server) string {
+func addCommentGetCreatedTime(t *testing.T, c store.Comment, ts *httptest.Server) (id string, created time.Time) {
 	b, err := json.Marshal(c)
 	require.NoError(t, err, "can't marshal comment %+v", c)

 	client := &http.Client{Timeout: 5 * time.Second}
 	defer client.CloseIdleConnections()
-	req, err := http.NewRequest("POST", ts.URL+"/api/v1/comment", bytes.NewBuffer(b))
+	postURL := ts.URL + "/api/v1/comment"
+	if c.Locator.SiteID != "" {
+		postURL += "?site=" + c.Locator.SiteID
+	}
+	req, err := http.NewRequest("POST", postURL, bytes.NewBuffer(b))
 	require.NoError(t, err)
 	req.Header.Add("X-JWT", devToken)
 	resp, err := client.Do(req)
@@ -619,7 +686,14 @@ func addComment(t *testing.T, c store.Comment, ts *httptest.Server) string {
 	err = json.Unmarshal(b, &crResp)
 	require.NoError(t, err)
 	time.Sleep(time.Nanosecond * 10)
-	return crResp["id"].(string)
+	created, err = time.Parse(time.RFC3339, crResp["time"].(string))
+	require.NoError(t, err)
+	return crResp["id"].(string), created
+}
+
+func addComment(t *testing.T, c store.Comment, ts *httptest.Server) string {
+	id, _ := addCommentGetCreatedTime(t, c, ts)
+	return id
 }

 func requireAdminOnly(t *testing.T, req *http.Request) {
@@ -635,7 +709,7 @@ func requireAdminOnly(t *testing.T, req *http.Request) {
 }

 func chooseRandomUnusedPort() (port int) {
-	for i := 0; i < 10; i++ {
+	for range 10 {
 		port = 40000 + int(rand.Int31n(10000))
 		if ln, err := net.Listen("tcp", fmt.Sprintf(":%d", port)); err == nil {
 			_ = ln.Close()
@@ -647,7 +721,7 @@ func chooseRandomUnusedPort() (port int) {

 func waitForHTTPSServerStart(port int) {
 	// wait for up to 3 seconds for HTTPS server to start
-	for i := 0; i < 300; i++ {
+	for range 300 {
 		time.Sleep(time.Millisecond * 10)
 		conn, _ := net.DialTimeout("tcp", fmt.Sprintf("localhost:%d", port), time.Millisecond*10)
 		if conn != nil {
@@ -658,5 +732,49 @@ func waitForHTTPSServerStart(port int) {
 }

 func TestMain(m *testing.M) {
-	goleak.VerifyTestMain(m)
+	goleak.VerifyTestMain(
+		m,
+		// this will be fixed in https://github.com/hashicorp/golang-lru/issues/159
+		goleak.IgnoreTopFunction("github.com/hashicorp/golang-lru/v2/expirable.NewLRU[...].func1"),
+	)
+}
+
+// TestRest_matchSiteID reproduces the multi-tenant isolation gap in the matchSiteID
+// middleware. Before the fix, the check `if siteID != "" && user.SiteID != siteID`
+// silently allowed any authenticated request that omitted the ?site= query param.
+// On admin and user-mutation routes this meant the cross-site check was bypassable
+// just by dropping the parameter. The fix requires ?site= to be present and to match
+// the user's bound site.
+func TestRest_matchSiteID(t *testing.T) {
+	wrapped := matchSiteID(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte("ok"))
+	}))
+
+	cases := []struct {
+		name     string
+		userSite string
+		query    string
+		want     int
+	}{
+		{name: "matching site allowed", userSite: "site-a", query: "?site=site-a", want: http.StatusOK},
+		{name: "mismatched site forbidden", userSite: "site-a", query: "?site=site-b", want: http.StatusForbidden},
+		{name: "missing site param rejected", userSite: "site-a", query: "", want: http.StatusForbidden},
+		{name: "empty site param rejected", userSite: "site-a", query: "?site=", want: http.StatusForbidden},
+	}
+
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			h := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				r = rest.SetUserInfo(r, store.User{ID: "u", Name: "u", SiteID: c.userSite})
+				wrapped.ServeHTTP(w, r)
+			})
+			ts := httptest.NewServer(h)
+			defer ts.Close()
+			resp, err := http.Get(ts.URL + c.query)
+			require.NoError(t, err)
+			require.NoError(t, resp.Body.Close())
+			assert.Equal(t, c.want, resp.StatusCode)
+		})
+	}
 }
@@ -5,7 +5,7 @@ import (
 	"net/http"
 	"time"

-	cache "github.com/go-pkgz/lcw"
+	cache "github.com/go-pkgz/lcw/v2"
 	log "github.com/go-pkgz/lgr"
 	"github.com/gorilla/feeds"

@@ -56,8 +56,7 @@ func (s *rss) postCommentsCtrl(w http.ResponseWriter, r *http.Request) {

 	w.Header().Set("Content-Type", "application/xml; charset=utf-8")
 	w.WriteHeader(http.StatusOK)
-
-	if _, err = w.Write(data); err != nil {
+	if _, err = w.Write(data); err != nil { //nolint:gosec // xml feed bytes from gorilla/feeds, not HTML
 		log.Printf("[WARN] failed to send response to %s, %s", r.RemoteAddr, err)
 	}
 }
@@ -88,7 +87,7 @@ func (s *rss) siteCommentsCtrl(w http.ResponseWriter, r *http.Request) {

 	w.Header().Set("Content-Type", "application/xml; charset=utf-8")
 	w.WriteHeader(http.StatusOK)
-	if _, err = w.Write(data); err != nil {
+	if _, err = w.Write(data); err != nil { //nolint:gosec // xml feed bytes from gorilla/feeds, not HTML
 		log.Printf("[WARN] failed to send response to %s, %s", r.RemoteAddr, err)
 	}
 }
@@ -120,7 +119,7 @@ func (s *rss) repliesCtrl(w http.ResponseWriter, r *http.Request) {

 	w.Header().Set("Content-Type", "application/xml; charset=utf-8")
 	w.WriteHeader(http.StatusOK)
-	if _, err = w.Write(data); err != nil {
+	if _, err = w.Write(data); err != nil { //nolint:gosec // xml feed bytes from gorilla/feeds, not HTML
 		log.Printf("[WARN] failed to send response to %s, %s", r.RemoteAddr, err)
 	}
 }
@@ -271,10 +271,7 @@ func TestServer_RssReplies(t *testing.T) {
 }

 func waitOnSecChange() {
-	for {
-		if time.Now().Nanosecond() < 100000000 {
-			break
-		}
+	for time.Now().Nanosecond() >= 100000000 {
 		time.Sleep(10 * time.Nanosecond)
 	}
 }
@@ -283,11 +280,11 @@ func waitOnSecChange() {
 func cleanRssFormatting(expected, actual string) (cleanExp, cleanAct string) {
 	reSpaces := regexp.MustCompile(`[\s\p{Zs}]{2,}`)

-	expected = strings.Replace(expected, "\n", " ", -1)
-	expected = strings.Replace(expected, "\t", " ", -1)
+	expected = strings.ReplaceAll(expected, "\n", " ")
+	expected = strings.ReplaceAll(expected, "\t", " ")
 	expected = reSpaces.ReplaceAllString(expected, " ")

-	actual = strings.Replace(actual, "\n", " ", -1)
+	actual = strings.ReplaceAll(actual, "\n", " ")
 	actual = reSpaces.ReplaceAllString(actual, " ")
 	return expected, actual
 }
@@ -21,7 +21,7 @@ func TestSSL_Redirect(t *testing.T) {

 	client := http.Client{
 		// prevent http redirect
-		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+		CheckRedirect: func(*http.Request, []*http.Request) error {
 			return http.ErrUseLastResponse
 		},

@@ -56,7 +56,7 @@ func TestSSL_ACME_HTTPChallengeRouter(t *testing.T) {

 	client := http.Client{
 		// prevent http redirect
-		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+		CheckRedirect: func(*http.Request, []*http.Request) error {
 			return http.ErrUseLastResponse
 		},
 	}
@@ -0,0 +1,116 @@
+{
+  "version": 1,
+  "comments": [
+    {
+      "commentHex": "e7a2ef4b4aa1414a7ee65a989889aaecd9d5e7e3bca598ea7a967b4dbcaa8e11",
+      "domain": "example.com",
+      "url": "/example",
+      "commenterHex": "018407e4b12b35f43b1d804d82607b341bef80c4325dd047d93f2cbb439cff85",
+      "markdown": "",
+      "html": "",
+      "parentHex": "root",
+      "score": 0,
+      "state": "approved",
+      "creationDate": "2022-10-25T07:25:46.807555Z",
+      "direction": 0,
+      "deleted": false
+    },
+    {
+      "commentHex": "a29e741145daceb4ca5b3e5e279e05b56f73c04703d93b944718ef757e15317f",
+      "domain": "example.com",
+      "url": "/example",
+      "commenterHex": "018407e4b12b35f43b1d804d82607b341bef80c4325dd047d93f2cbb439cff85",
+      "markdown": "",
+      "html": "",
+      "parentHex": "root",
+      "score": 0,
+      "state": "approved",
+      "creationDate": "2023-07-26T12:24:55.058552Z",
+      "direction": 0,
+      "deleted": false
+    },
+    {
+      "commentHex": "46baf36433830a4e8bda1de56290cf5fd74c08bfa844fee4ec1744985dc77010",
+      "domain": "example.com",
+      "url": "/example",
+      "commenterHex": "018407e4b12b35f43b1d804d82607b341bef80c4325dd047d93f2cbb439cff85",
+      "markdown": "",
+      "html": "",
+      "parentHex": "root",
+      "score": 0,
+      "state": "approved",
+      "creationDate": "2023-10-31T11:03:25.403282Z",
+      "direction": 0,
+      "deleted": false
+    },
+    {
+      "commentHex": "6d3bb64ff73b5f9d6a959212ffde472a51abf8bdefaa5ed843659796bceef9de",
+      "domain": "example.com",
+      "url": "/example",
+      "commenterHex": "018407e4b12b35f43b1d804d82607b341bef80c4325dd047d93f2cbb439cff85",
+      "markdown": "",
+      "html": "",
+      "parentHex": "46baf36433830a4e8bda1de56290cf5fd74c08bfa844fee4ec1744985dc77010",
+      "score": 0,
+      "state": "approved",
+      "creationDate": "2023-11-01T22:23:47.112062Z",
+      "direction": 0,
+      "deleted": false
+    },
+    {
+      "commentHex": "23fcfcd03745ed71a9d23a9b59387a313df57e5c0faad8ba5dc96112766312c5",
+      "domain": "example.com",
+      "url": "/example",
+      "commenterHex": "018407e4b12b35f43b1d804d82607b341bef80c4325dd047d93f2cbb439cff85",
+      "markdown": "",
+      "html": "",
+      "parentHex": "root",
+      "score": 0,
+      "state": "approved",
+      "creationDate": "2023-10-23T12:33:03.370182Z",
+      "direction": 0,
+      "deleted": false
+    },
+    {
+      "commentHex": "d0ad6f11cf0c5f8e17457a378a6bb789f412c6b7ef7ada4ae06ec8451f7a18aa",
+      "domain": "example.com",
+      "url": "/example",
+      "commenterHex": "018407e4b12b35f43b1d804d82607b341bef80c4325dd047d93f2cbb439cff85",
+      "markdown": "",
+      "html": "",
+      "parentHex": "root",
+      "score": 0,
+      "state": "approved",
+      "creationDate": "2023-10-18T01:18:38.193625Z",
+      "direction": 0,
+      "deleted": false
+    },
+    {
+      "commentHex": "098960fd01c1fc7c0d3ea428f52fab97ea5c18aa52f3565bba679224daddc687",
+      "domain": "example.com",
+      "url": "/example",
+      "commenterHex": "018407e4b12b35f43b1d804d82607b341bef80c4325dd047d93f2cbb439cff85",
+      "markdown": "",
+      "html": "",
+      "parentHex": "23fcfcd03745ed71a9d23a9b59387a313df57e5c0faad8ba5dc96112766312c5",
+      "score": 0,
+      "state": "approved",
+      "creationDate": "2023-11-01T22:24:04.639965Z",
+      "direction": 0,
+      "deleted": false
+    }
+  ],
+  "commenters": [
+    {
+      "commenterHex": "018407e4b12b35f43b1d804d82607b341bef80c4325dd047d93f2cbb439cff85",
+      "email": "undefined",
+      "name": "blank",
+      "link": "undefined",
+      "photo": "undefined",
+      "provider": "anon",
+      "joinDate": "2022-06-09T15:54:29.865919Z",
+      "isModerator": false,
+      "deleted": false
+    }
+  ]
+}
@@ -10,7 +10,6 @@ import (
 	"runtime"
 	"strings"

-	"github.com/go-chi/render"
 	log "github.com/go-pkgz/lgr"
 	"github.com/go-pkgz/rest"

@@ -52,7 +51,7 @@ type errTmplData struct {
 // error code is not included in render as it is intended for UI developers and not for the users
 func SendErrorHTML(w http.ResponseWriter, r *http.Request, httpStatusCode int, err error, details string, errCode int) {
 	// MustExecute behaves like template.Execute, but panics if an error occurs.
-	MustExecute := func(tmpl *template.Template, wr io.Writer, data interface{}) {
+	MustExecute := func(tmpl *template.Template, wr io.Writer, data any) {
 		if err = tmpl.Execute(wr, data); err != nil {
 			panic(err)
 		}
@@ -67,20 +66,36 @@ func SendErrorHTML(w http.ResponseWriter, r *http.Request, httpStatusCode int, e
 	tmplstr := MustRead("error_response.html.tmpl")
 	tmpl := template.Must(template.New("error").Parse(tmplstr))
 	log.Printf("[WARN] %s", errDetailsMsg(r, httpStatusCode, err, details, errCode))
-	render.Status(r, httpStatusCode)
+
 	msg := bytes.Buffer{}
 	MustExecute(tmpl, &msg, errTmplData{
 		Error:   err.Error(),
 		Details: details,
 	})
-	render.HTML(w, r, msg.String())
+
+	HTMLResponse(w, httpStatusCode, msg.String())
 }

 // SendErrorJSON makes {error: blah, details: blah, code: 42} json body and responds with error code
 func SendErrorJSON(w http.ResponseWriter, r *http.Request, httpStatusCode int, err error, details string, errCode int) {
 	log.Printf("[WARN] %s", errDetailsMsg(r, httpStatusCode, err, details, errCode))
-	render.Status(r, httpStatusCode)
-	render.JSON(w, r, rest.JSON{"error": err.Error(), "details": details, "code": errCode})
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(httpStatusCode)
+	rest.RenderJSON(w, rest.JSON{"error": err.Error(), "details": details, "code": errCode})
+}
+
+// HTMLResponse writes HTML content with the given status code
+func HTMLResponse(w http.ResponseWriter, status int, html string) {
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	w.WriteHeader(status)
+	_, _ = w.Write([]byte(html))
+}
+
+// PlainTextResponse writes plain text content with the given status code
+func PlainTextResponse(w http.ResponseWriter, status int, text string) {
+	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+	w.WriteHeader(status)
+	_, _ = w.Write([]byte(text))
 }

 func errDetailsMsg(r *http.Request, httpStatusCode int, err error, details string, errCode int) string {
@@ -0,0 +1,76 @@
+package rest
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+// StrictImageCSP is the strictest default-deny Content-Security-Policy used both by
+// image-serving handlers (/api/v1/img, /api/v1/picture/{user}/{id}) and by the api-wide
+// apiCSPMiddleware (covering all /api/v1/* responses — JSON, XML/RSS, images). The name
+// keeps the "image" prefix for historical reasons; the policy itself is generic and
+// suitable for any non-document API response.
+//
+// Re-setting the same value inside the image handlers (after the middleware already set
+// it) is intentional defense-in-depth: if the middleware ever stops applying (route
+// refactor, mount point change), the handlers still emit the header.
+const StrictImageCSP = "default-src 'none'; sandbox; frame-ancestors 'none'"
+
+// SafeImgContentType returns the sniffed content type for provided bytes if and only
+// if it is in the strict allowlist of image formats safe to serve from a same-origin
+// proxy endpoint: image/png, image/jpeg, image/gif, image/webp, image/bmp, image/x-icon.
+// Anything else — HTML, XML, SVG, plain text, application/octet-stream, or any future
+// image format the stdlib sniffer may learn (e.g. AVIF, HEIC, JXL, TIFF) — is rejected.
+// SVG would also be rejected as it sniffs as text/xml or text/plain, never image/svg+xml.
+// The previous behavior silently mapped application/octet-stream to image/* and is gone.
+func SafeImgContentType(img []byte) (string, error) {
+	contentType := http.DetectContentType(img)
+	base, _, _ := strings.Cut(contentType, ";")
+	base = strings.TrimSpace(base)
+	switch base {
+	case "image/png", "image/jpeg", "image/gif", "image/webp", "image/bmp", "image/x-icon":
+		return base, nil
+	}
+	return "", fmt.Errorf("non-image content type %q", contentType)
+}
+
+// SetImageDefenseHeaders applies the layered defense headers shared by every response
+// from image-serving endpoints (success, 304, or error). Each header survives content-type
+// validation regressions, browser sniffing, and top-level navigation:
+//   - Content-Security-Policy: strict, with sandbox — blocks inline scripts and event handlers
+//   - X-Content-Type-Options: nosniff — prevents browsers from MIME-overriding the declared type
+//   - Content-Disposition: inline; filename="image" — frames the response as a file, not a document
+//
+// CSP is duplicated by apiCSPMiddleware for /api/v1/* — re-setting the same value here is
+// harmless and provides defense-in-depth if the middleware is bypassed or moved. The other
+// two headers (nosniff, Content-Disposition with filename) are image-specific and not set
+// by the middleware.
+func SetImageDefenseHeaders(w http.ResponseWriter) {
+	w.Header().Set("Content-Security-Policy", StrictImageCSP)
+	w.Header().Set("X-Content-Type-Options", "nosniff")
+	w.Header().Set("Content-Disposition", `inline; filename="image"`)
+}
+
+// EtagMatches reports whether If-None-Match header value contains the given etag.
+// Handles the * wildcard, comma-separated etag lists with the W/ weak-validator prefix.
+// NOTE: This is intentionally a simple splitter — it does not handle opaque-tags that
+// contain commas (allowed by RFC 7232 but never emitted by this codebase, whose etag
+// format is `"v2:<base64-url>"` or `"<user>/<xid>"`). If the etag format ever changes
+// to include comma-bearing values, revisit this parser.
+// Replaces a substring search that could match unrelated entries (e.g. an etag that
+// happens to be a prefix of another).
+func EtagMatches(header, etag string) bool {
+	header = strings.TrimSpace(header)
+	if header == "*" {
+		return true
+	}
+	for tag := range strings.SplitSeq(header, ",") {
+		tag = strings.TrimSpace(tag)
+		tag = strings.TrimPrefix(tag, "W/")
+		if tag == etag {
+			return true
+		}
+	}
+	return false
+}
@@ -0,0 +1,103 @@
+package rest
+
+import (
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestEtagMatches covers the strict If-None-Match parser that replaced a substring
+// search prone to false positives (etag "abc" being matched inside "fooabc").
+func TestEtagMatches(t *testing.T) {
+	tbl := []struct {
+		name   string
+		header string
+		etag   string
+		want   bool
+	}{
+		{"exact match", `"v2:abc"`, `"v2:abc"`, true},
+		{"comma-separated, second matches", `"x", "v2:abc"`, `"v2:abc"`, true},
+		{"weak validator prefix", `W/"v2:abc"`, `"v2:abc"`, true},
+		{"wildcard matches anything", `*`, `"v2:abc"`, true},
+		{"leading/trailing whitespace", `   "v2:abc"   `, `"v2:abc"`, true},
+		{"substring not enough", `"v2:abcdef"`, `"v2:abc"`, false},
+		{"prefix-only mismatch", `"v2:ab"`, `"v2:abc"`, false},
+		{"pre-fix etag no longer matches v2", `"abc"`, `"v2:abc"`, false},
+		{"empty header", ``, `"v2:abc"`, false},
+		{"different etag", `"v2:xyz"`, `"v2:abc"`, false},
+	}
+	for _, tt := range tbl {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equal(t, tt.want, EtagMatches(tt.header, tt.etag))
+		})
+	}
+}
+
+func TestSetImageDefenseHeaders(t *testing.T) {
+	w := httptest.NewRecorder()
+	SetImageDefenseHeaders(w)
+	assert.Equal(t, StrictImageCSP, w.Header().Get("Content-Security-Policy"))
+	assert.Equal(t, "nosniff", w.Header().Get("X-Content-Type-Options"))
+	assert.Equal(t, `inline; filename="image"`, w.Header().Get("Content-Disposition"))
+}
+
+// TestSafeImgContentType exercises the strict allowlist. The previous behavior
+// (HasPrefix "image/" with an explicit image/svg+xml carve-out) is gone — the
+// allowlist is the source of truth, and the explicit svg branch was dead code
+// because http.DetectContentType never returns image/svg+xml (real SVG bodies
+// sniff as text/xml or text/plain depending on whether they carry an XML decl,
+// so they are rejected implicitly by not matching the allowlist).
+func TestSafeImgContentType(t *testing.T) {
+	// minimal magic-byte bodies — verified via http.DetectContentType to produce
+	// the expected image/* result without needing testdata files for every format
+	pngMagic := []byte("\x89PNG\r\n\x1a\n")
+	jpegMagic := []byte("\xff\xd8\xff\xe0\x00\x10JFIF\x00")
+	gifBytes := []byte("GIF89a")
+	webpBytes := []byte("RIFF\x00\x00\x00\x00WEBPVP8 ")
+	bmpBytes := []byte("BM\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00")
+	icoBytes := []byte("\x00\x00\x01\x00\x01\x00")
+
+	// SVG with XML decl sniffs as text/xml — rejected because it's not in the allowlist
+	svgWithXMLDecl := []byte(`<?xml version="1.0"?><svg xmlns="http://www.w3.org/2000/svg" onload="alert(1)"></svg>`)
+	// SVG without XML decl sniffs as text/plain — also rejected
+	svgPlain := []byte(`<svg xmlns="http://www.w3.org/2000/svg" width="10"></svg>`)
+
+	tbl := []struct {
+		name    string
+		body    []byte
+		wantCT  string
+		wantErr bool
+	}{
+		{name: "nil rejected", body: nil, wantErr: true},
+		{name: "empty rejected", body: []byte{}, wantErr: true},
+		{name: "png magic accepted", body: pngMagic, wantCT: "image/png"},
+		{name: "jpeg magic accepted", body: jpegMagic, wantCT: "image/jpeg"},
+		{name: "gif accepted", body: gifBytes, wantCT: "image/gif"},
+		{name: "webp accepted", body: webpBytes, wantCT: "image/webp"},
+		{name: "bmp accepted", body: bmpBytes, wantCT: "image/bmp"},
+		{name: "ico accepted", body: icoBytes, wantCT: "image/x-icon"},
+		{name: "html doc rejected", body: []byte(`<!DOCTYPE html><html></html>`), wantErr: true},
+		{name: "html fragment rejected", body: []byte(`<body><img></body>`), wantErr: true},
+		{name: "plain text rejected", body: []byte("hello world"), wantErr: true},
+		{name: "octet-stream rejected", body: []byte{0x00, 0x01, 0x02, 0x03, 0x04}, wantErr: true},
+		{name: "svg with xml decl rejected (sniffs as text/xml)", body: svgWithXMLDecl, wantErr: true},
+		{name: "svg without xml decl rejected (sniffs as text/plain)", body: svgPlain, wantErr: true},
+	}
+	for _, tt := range tbl {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := SafeImgContentType(tt.body)
+			if tt.wantErr {
+				require.Error(t, err)
+				assert.Empty(t, got)
+				assert.Contains(t, err.Error(), "non-image content type")
+				return
+			}
+			require.NoError(t, err)
+			assert.Equal(t, tt.wantCT, got)
+			// returned type must never carry a charset suffix (the strip code path)
+			assert.NotContains(t, got, ";")
+		})
+	}
+}
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/base64"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -12,12 +13,18 @@ import (

 	"github.com/PuerkitoBio/goquery"
 	log "github.com/go-pkgz/lgr"
-	"github.com/go-pkgz/repeater"
+	"github.com/go-pkgz/repeater/v2"

 	"github.com/umputun/remark42/backend/app/rest"
+	"github.com/umputun/remark42/backend/app/safehttp"
 	"github.com/umputun/remark42/backend/app/store/image"
 )

+// errInvalidUpstreamContentType is returned by downloadImage when the upstream's
+// Content-Type header is not image/*. The handler checks via errors.Is to convert
+// it into a 400 (input rejected) instead of the generic 404 (fetch failed).
+var errInvalidUpstreamContentType = errors.New("invalid upstream content type")
+
 // Image extracts image src from comment's html and provides proxy for them
 // this is needed to keep remark42 running behind of HTTPS serve all images via https
 type Image struct {
@@ -27,6 +34,11 @@ type Image struct {
 	CacheExternal bool
 	Timeout       time.Duration
 	ImageService  *image.Service
+	// Transport, if non-nil, is used as-is for outbound image fetches and is the
+	// caller's responsibility to make SSRF-safe. When nil, safehttp.Transport()
+	// is installed, which blocks dialing any private/reserved IP and resolves
+	// hostnames to defeat DNS rebinding.
+	Transport http.RoundTripper
 }

 // Convert img src links to proxied links depends on enabled options
@@ -57,7 +69,7 @@ func (p Image) extract(commentHTML string, imgSrcPred func(string) bool) ([]stri
 		return nil, fmt.Errorf("can't create document: %w", err)
 	}
 	result := []string{}
-	doc.Find("img").Each(func(i int, s *goquery.Selection) {
+	doc.Find("img").Each(func(_ int, s *goquery.Selection) {
 		if im, ok := s.Attr("src"); ok {
 			if imgSrcPred(im) {
 				result = append(result, im)
@@ -72,33 +84,73 @@ func (p Image) replace(commentHTML string, imgs []string) string {
 	for _, img := range imgs {
 		encodedImgURL := base64.URLEncoding.EncodeToString([]byte(img))
 		resImgURL := p.RemarkURL + p.RoutePath + "?src=" + encodedImgURL
-		commentHTML = strings.Replace(commentHTML, img, resImgURL, -1)
+		commentHTML = strings.ReplaceAll(commentHTML, img, resImgURL)
 	}

 	return commentHTML
 }

+// etagVersionPrefix is the security-version tag bumped whenever cached responses for the
+// same src need to be invalidated. Pre-fix responses were served as text/html and cached
+// by browsers/proxies under ETag `"<base64(src)>"`; the prefix invalidates those validators
+// so revalidating clients get a fresh 200 instead of letting the cached HTML 304.
+//
+// LIMITATION: with the 30-day max-age below, browsers serve pre-fix bytes from their
+// local cache without contacting the server until that TTL expires or the cache is
+// evicted under memory pressure. The prefix only helps clients that revalidate during
+// the cached lifetime (Ctrl+R, intermediaries, post-expiry use). Operators running a
+// CDN/edge cache in front of remark42 should purge /api/v1/img after deploy. The
+// realistic exposure is narrow: cache carryover only affects users who navigated
+// top-level to an attacker URL pre-fix and still have that URL cached — the normal
+// <img> embed path cached text/html but never executed it.
+const etagVersionPrefix = "v2:"
+
 // Handler returns http handler respond to proxied request
 func (p Image) Handler(w http.ResponseWriter, r *http.Request) {
-	src, err := base64.URLEncoding.DecodeString(r.URL.Query().Get("src"))
+	rest.SetImageDefenseHeaders(w)
+
+	srcParam := r.URL.Query().Get("src")
+	src, err := base64.URLEncoding.DecodeString(srcParam)
 	if err != nil {
-		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't decode image url", rest.ErrDecode)
+		sendImageProxyError(w, r, http.StatusBadRequest, err, "can't decode image url", rest.ErrDecode)
 		return
 	}

 	imgURL := string(src)
-	var img []byte
 	imgID, err := image.CachedImgID(imgURL)
 	if err != nil {
-		rest.SendErrorJSON(w, r, http.StatusBadRequest, err, "can't parse image url "+imgURL, rest.ErrAssetNotFound)
+		sendImageProxyError(w, r, http.StatusBadRequest, fmt.Errorf("invalid image url"), "can't parse image url", rest.ErrAssetNotFound)
 		return
 	}
+
+	// compute the current-version etag once. We don't set it as a response header yet
+	// because error paths below must NOT inherit it — otherwise transient failures
+	// (4xx) would get cached alongside the 30-day Cache-Control of the success path.
+	// The etag (and Cache-Control) are set only on the 304 short-circuit and the
+	// validated 200 path.
+	etag := `"` + etagVersionPrefix + srcParam + `"`
+	// short-circuit revalidation before any cache lookup or upstream fetch: a matching
+	// current-version If-None-Match means the client already has bytes from a prior
+	// successful (post-fix, validated) 200, so a bodyless 304 is safe and avoids
+	// upstream DoS amplification on hot comment pages without CacheExternal.
+	if match := r.Header.Get("If-None-Match"); match != "" && rest.EtagMatches(match, etag) {
+		w.Header().Set("Etag", etag)
+		w.Header().Set("Cache-Control", "max-age=2592000") // 30 days
+		w.WriteHeader(http.StatusNotModified)
+		return
+	}
+
 	// try to load from cache for case it was saved when CacheExternal was enabled
-	img, _ = p.ImageService.Load(imgID)
+	img, _ := p.ImageService.Load(imgID)
 	if img == nil {
-		img, err = p.downloadImage(context.Background(), imgURL)
+		img, err = p.downloadImage(r.Context(), imgURL)
 		if err != nil {
-			rest.SendErrorJSON(w, r, http.StatusNotFound, err, "can't get image "+imgURL, rest.ErrAssetNotFound)
+			log.Printf("[WARN] failed to download image: %v", err)
+			if errors.Is(err, errInvalidUpstreamContentType) {
+				sendImageProxyError(w, r, http.StatusBadRequest, fmt.Errorf("invalid content type"), "invalid content type", rest.ErrImgNotFound)
+				return
+			}
+			sendImageProxyError(w, r, http.StatusNotFound, fmt.Errorf("failed to fetch"), "can't get image", rest.ErrAssetNotFound)
 			return
 		}
 		if p.CacheExternal {
@@ -106,24 +158,37 @@ func (p Image) Handler(w http.ResponseWriter, r *http.Request) {
 		}
 	}

-	// enforce client-side caching
-	etag := `"` + r.URL.Query().Get("src") + `"`
-	w.Header().Set("Etag", etag)
-	w.Header().Set("Cache-Control", "max-age=2592000") // 30 days
-	if match := r.Header.Get("If-None-Match"); match != "" {
-		if strings.Contains(match, etag) {
-			w.WriteHeader(http.StatusNotModified)
-			return
-		}
+	// validate body bytes are actually an image — never trust upstream Content-Type or cache
+	contentType, err := rest.SafeImgContentType(img)
+	if err != nil {
+		log.Printf("[WARN] rejecting non-image content from %s: %v", imgURL, err)
+		sendImageProxyError(w, r, http.StatusUnsupportedMediaType, err, "invalid image content", rest.ErrImgNotFound)
+		return
 	}

-	w.Header().Add("Content-Type", p.ImageService.ImgContentType(img))
+	// success path: long-lived client cache with etag for cheap revalidation. 30-day
+	// TTL keeps the proxy efficient for hot pages; when clients DO revalidate
+	// (Ctrl+R, intermediaries, post-expiry), the versioned etag ensures pre-fix
+	// poisoned validators don't match and a fresh validated 200 is returned. See
+	// etagVersionPrefix godoc for the limitation on browser-local caches.
+	w.Header().Set("Etag", etag)
+	w.Header().Set("Cache-Control", "max-age=2592000") // 30 days
+	w.Header().Set("Content-Type", contentType)
 	_, err = io.Copy(w, bytes.NewReader(img))
 	if err != nil {
 		log.Printf("[WARN] can't copy image stream, %s", err)
 	}
 }

+// sendImageProxyError writes a no-store error response so a transient failure (4xx)
+// cannot inherit the success path's 30-day Cache-Control or the versioned ETag, which
+// would otherwise pin the error in the browser/intermediary cache for that TTL.
+// Defense headers from SetImageDefenseHeaders at the top of the handler survive.
+func sendImageProxyError(w http.ResponseWriter, r *http.Request, status int, err error, details string, errCode int) {
+	w.Header().Set("Cache-Control", "no-store")
+	rest.SendErrorJSON(w, r, status, err, details, errCode)
+}
+
 // cache image from provided Reader using given ID
 func (p Image) cacheImage(r io.Reader, imgID string) {
 	err := p.ImageService.SaveWithID(imgID, r)
@@ -144,16 +209,26 @@ func (p Image) downloadImage(ctx context.Context, imgURL string) ([]byte, error)
 	ctx, cancel := context.WithTimeout(ctx, timeout)
 	defer cancel()

-	client := http.Client{Timeout: 30 * time.Second}
+	transport := p.Transport
+	if transport == nil {
+		transport = safehttp.Transport()
+	}
+	client := http.Client{
+		Timeout:   30 * time.Second,
+		Transport: transport,
+	}
 	defer client.CloseIdleConnections()
 	var resp *http.Response
-	err := repeater.NewDefault(5, time.Second).Do(ctx, func() error {
+	err := repeater.NewFixed(5, time.Second).Do(ctx, func() error {
 		var e error
-		req, e := http.NewRequest("GET", imgURL, http.NoBody)
+		// SSRF safety: client.Transport is safehttp.Transport() when p.Transport is nil
+		// (see Image.Transport contract above); when caller supplies a transport they
+		// own SSRF safety for that path.
+		req, e := http.NewRequest("GET", imgURL, http.NoBody) //nolint:gosec // see comment above
 		if e != nil {
 			return fmt.Errorf("failed to make request for %s: %w", imgURL, e)
 		}
-		resp, e = client.Do(req.WithContext(ctx)) //nolint:bodyclose // need a refactor to fix that
+		resp, e = client.Do(req.WithContext(ctx)) //nolint:bodyclose,gosec // body closed in defer; transport contract above
 		return e
 	})
 	if err != nil {
@@ -165,9 +240,22 @@ func (p Image) downloadImage(ctx context.Context, imgURL string) ([]byte, error)
 		return nil, fmt.Errorf("got unsuccessful response status %d while fetching %s", resp.StatusCode, imgURL)
 	}

-	imgData, err := io.ReadAll(resp.Body)
+	contentType := resp.Header.Get("Content-Type")
+	if !strings.HasPrefix(contentType, "image/") {
+		return nil, fmt.Errorf("%w: %s", errInvalidUpstreamContentType, contentType)
+	}
+
+	maxSize := 5 * 1024 * 1024 // 5MB default
+	if p.ImageService != nil && p.ImageService.MaxSize > 0 {
+		maxSize = p.ImageService.MaxSize
+	}
+	lr := io.LimitReader(resp.Body, int64(maxSize)+1)
+	imgData, err := io.ReadAll(lr)
 	if err != nil {
-		return nil, fmt.Errorf("unable to read image body")
+		return nil, fmt.Errorf("unable to read image body: %w", err)
+	}
+	if len(imgData) > maxSize {
+		return nil, fmt.Errorf("image is too large")
 	}
 	return imgData, nil
 }
@@ -77,7 +77,6 @@ func TestImage_Extract(t *testing.T) {
 	img := Image{HTTP2HTTPS: true}

 	for i, tt := range tbl {
-		tt := tt
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			res, err := img.extract(tt.inp, func(src string) bool { return strings.HasPrefix(src, "http://") })
 			assert.NoError(t, err)
@@ -95,12 +94,13 @@ func TestImage_Replace(t *testing.T) {

 func TestImage_Routes(t *testing.T) {
 	// no image supposed to be cached
-	imageStore := image.StoreMock{LoadFunc: func(id string) ([]byte, error) { return nil, nil }}
+	imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) { return nil, nil }}
 	img := Image{
 		HTTP2HTTPS:   true,
 		RemarkURL:    "https://demo.remark42.com",
 		RoutePath:    "/api/v1/proxy",
 		ImageService: image.NewService(&imageStore, image.ServiceParams{}),
+		Transport:    http.DefaultTransport,
 	}

 	ts := httptest.NewServer(http.HandlerFunc(img.Handler))
@@ -108,35 +108,50 @@ func TestImage_Routes(t *testing.T) {
 	httpSrv := imgHTTPTestsServer(t)
 	defer httpSrv.Close()

-	encodedImgURL := base64.URLEncoding.EncodeToString([]byte(httpSrv.URL + "/image/img1.png"))
+	t.Run("valid image", func(t *testing.T) {
+		encodedImgURL := base64.URLEncoding.EncodeToString([]byte(httpSrv.URL + "/image/img1.png"))
+		resp, err := http.Get(ts.URL + "/?src=" + encodedImgURL)
+		require.NoError(t, err)
+		assert.NoError(t, resp.Body.Close())
+		assert.Equal(t, http.StatusOK, resp.StatusCode)
+		assert.Equal(t, "1462", resp.Header["Content-Length"][0])
+		assert.Equal(t, "image/png", resp.Header["Content-Type"][0])
+	})

-	resp, err := http.Get(ts.URL + "/?src=" + encodedImgURL)
-	require.NoError(t, err)
-	assert.NoError(t, resp.Body.Close())
-	assert.Equal(t, http.StatusOK, resp.StatusCode)
-	assert.Equal(t, "1462", resp.Header["Content-Length"][0])
-	assert.Equal(t, "image/png", resp.Header["Content-Type"][0])
+	t.Run("no image", func(t *testing.T) {
+		encodedImgURL := base64.URLEncoding.EncodeToString([]byte(httpSrv.URL + "/image/no-such-image.png"))
+		resp, err := http.Get(ts.URL + "/?src=" + encodedImgURL)
+		require.NoError(t, err)
+		assert.NoError(t, resp.Body.Close())
+		assert.Equal(t, http.StatusNotFound, resp.StatusCode)
+	})

-	encodedImgURL = base64.URLEncoding.EncodeToString([]byte(httpSrv.URL + "/image/no-such-image.png"))
-	resp, err = http.Get(ts.URL + "/?src=" + encodedImgURL)
-	require.NoError(t, err)
-	assert.NoError(t, resp.Body.Close())
-	assert.Equal(t, http.StatusNotFound, resp.StatusCode)
+	t.Run("bad encoding", func(t *testing.T) {
+		encodedImgURL := base64.URLEncoding.EncodeToString([]byte(httpSrv.URL + "bad encoding"))
+		resp, err := http.Get(ts.URL + "/?src=" + encodedImgURL)
+		require.NoError(t, err)
+		assert.NoError(t, resp.Body.Close())
+		assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
+		assert.Equal(t, 2, len(imageStore.LoadCalls()))
+	})

-	encodedImgURL = base64.URLEncoding.EncodeToString([]byte(httpSrv.URL + "bad encoding"))
-	resp, err = http.Get(ts.URL + "/?src=" + encodedImgURL)
-	require.NoError(t, err)
-	assert.NoError(t, resp.Body.Close())
-	assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
-	assert.Equal(t, 2, len(imageStore.LoadCalls()))
+	t.Run("non-image reference", func(t *testing.T) {
+		encodedImgURL := base64.URLEncoding.EncodeToString([]byte("https://google.com"))
+		resp, err := http.Get(ts.URL + "/?src=" + encodedImgURL)
+		require.NoError(t, err)
+		assert.NoError(t, resp.Body.Close())
+		assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
+		assert.Equal(t, 3, len(imageStore.LoadCalls()))
+	})
 }

 func TestImage_DisabledCachingAndHTTP2HTTPS(t *testing.T) {
-	imageStore := image.StoreMock{LoadFunc: func(id string) ([]byte, error) { return nil, nil }}
+	imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) { return nil, nil }}
 	img := Image{
 		RemarkURL:    "https://demo.remark42.com",
 		RoutePath:    "/api/v1/proxy",
 		ImageService: image.NewService(&imageStore, image.ServiceParams{}),
+		Transport:    http.DefaultTransport,
 	}

 	ts := httptest.NewServer(http.HandlerFunc(img.Handler))
@@ -158,10 +173,10 @@ func TestImage_DisabledCachingAndHTTP2HTTPS(t *testing.T) {

 func TestImage_RoutesCachingImage(t *testing.T) {
 	imageStore := image.StoreMock{
-		LoadFunc: func(id string) ([]byte, error) {
+		LoadFunc: func(string) ([]byte, error) {
 			return nil, nil
 		},
-		SaveFunc: func(id string, img []byte) error {
+		SaveFunc: func(string, []byte) error {
 			return nil
 		},
 	}
@@ -170,6 +185,7 @@ func TestImage_RoutesCachingImage(t *testing.T) {
 		RemarkURL:     "https://demo.remark42.com",
 		RoutePath:     "/api/v1/proxy",
 		ImageService:  image.NewService(&imageStore, image.ServiceParams{MaxSize: 1500}),
+		Transport:     http.DefaultTransport,
 	}

 	ts := httptest.NewServer(http.HandlerFunc(img.Handler))
@@ -194,45 +210,71 @@ func TestImage_RoutesCachingImage(t *testing.T) {
 }

 func TestImage_RoutesUsingCachedImage(t *testing.T) {
-	// In order to validate that cached data used cache "will return" some other data from what http server would
-	testImage := []byte(fmt.Sprintf("%256s", "X"))
-	imageStore := image.StoreMock{LoadFunc: func(id string) ([]byte, error) {
-		return testImage, nil
-	}}
-	img := Image{
-		CacheExternal: true,
-		RemarkURL:     "https://demo.remark42.com",
-		RoutePath:     "/api/v1/proxy",
-		ImageService:  image.NewService(&imageStore, image.ServiceParams{}),
-	}
+	t.Run("cached image is served", func(t *testing.T) {
+		imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) {
+			return gopherPNGBytes(), nil
+		}}
+		img := Image{
+			CacheExternal: true,
+			RemarkURL:     "https://demo.remark42.com",
+			RoutePath:     "/api/v1/proxy",
+			ImageService:  image.NewService(&imageStore, image.ServiceParams{}),
+		}

-	ts := httptest.NewServer(http.HandlerFunc(img.Handler))
-	defer ts.Close()
-	httpSrv := imgHTTPTestsServer(t)
-	defer httpSrv.Close()
+		ts := httptest.NewServer(http.HandlerFunc(img.Handler))
+		defer ts.Close()
+		httpSrv := imgHTTPTestsServer(t)
+		defer httpSrv.Close()

-	encodedImgURL := base64.URLEncoding.EncodeToString([]byte(httpSrv.URL + "/image/img1.png"))
+		encodedImgURL := base64.URLEncoding.EncodeToString([]byte(httpSrv.URL + "/image/img1.png"))
+		resp, err := http.Get(ts.URL + "/?src=" + encodedImgURL)
+		require.NoError(t, err)
+		assert.NoError(t, resp.Body.Close())
+		assert.Equal(t, http.StatusOK, resp.StatusCode)
+		assert.Equal(t, "image/png", resp.Header.Get("Content-Type"))
+		assert.Equal(t, 1, len(imageStore.LoadCalls()))
+	})

-	resp, err := http.Get(ts.URL + "/?src=" + encodedImgURL)
-	require.NoError(t, err)
-	assert.NoError(t, resp.Body.Close())
-	assert.Equal(t, http.StatusOK, resp.StatusCode)
-	assert.Equal(t, "256", resp.Header["Content-Length"][0])
-	assert.Equal(t, "text/plain; charset=utf-8", resp.Header["Content-Type"][0],
-		"if you save text you receive text/plain in response, that's only fair option you got")
+	t.Run("non-image cached bytes are rejected (cache poisoning defense)", func(t *testing.T) {
+		nonImage := fmt.Appendf(nil, "%256s", "X")
+		imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) {
+			return nonImage, nil
+		}}
+		img := Image{
+			CacheExternal: true,
+			RemarkURL:     "https://demo.remark42.com",
+			RoutePath:     "/api/v1/proxy",
+			ImageService:  image.NewService(&imageStore, image.ServiceParams{}),
+		}

-	assert.Equal(t, 1, len(imageStore.LoadCalls()))
+		ts := httptest.NewServer(http.HandlerFunc(img.Handler))
+		defer ts.Close()
+		httpSrv := imgHTTPTestsServer(t)
+		defer httpSrv.Close()
+
+		encodedImgURL := base64.URLEncoding.EncodeToString([]byte(httpSrv.URL + "/image/img1.png"))
+		resp, err := http.Get(ts.URL + "/?src=" + encodedImgURL)
+		require.NoError(t, err)
+		body, _ := io.ReadAll(resp.Body)
+		assert.NoError(t, resp.Body.Close())
+		assert.Equal(t, http.StatusUnsupportedMediaType, resp.StatusCode,
+			"non-image bytes from cache must be rejected, not served as text/plain (XSS defense)")
+		assert.False(t, strings.HasPrefix(resp.Header.Get("Content-Type"), "text/html"),
+			"reject response must not be text/html; got %q", resp.Header.Get("Content-Type"))
+		assert.NotContains(t, string(body), "XXXXX", "non-image bytes must not be echoed back")
+	})
 }

 func TestImage_RoutesTimedOut(t *testing.T) {
 	// no image supposed to be cached
-	imageStore := image.StoreMock{LoadFunc: func(id string) ([]byte, error) { return nil, nil }}
+	imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) { return nil, nil }}
 	img := Image{
 		HTTP2HTTPS:   true,
 		RemarkURL:    "https://demo.remark42.com",
 		RoutePath:    "/api/v1/proxy",
 		Timeout:      50 * time.Millisecond,
 		ImageService: image.NewService(&imageStore, image.ServiceParams{}),
+		Transport:    http.DefaultTransport,
 	}

 	ts := httptest.NewServer(http.HandlerFunc(img.Handler))
@@ -249,7 +291,8 @@ func TestImage_RoutesTimedOut(t *testing.T) {
 	assert.NoError(t, resp.Body.Close())
 	require.NoError(t, err)
 	t.Log(string(b))
-	assert.True(t, strings.Contains(string(b), "deadline exceeded"))
+	assert.Contains(t, string(b), "failed to fetch")
+	assert.NotContains(t, string(b), "deadline exceeded", "should not leak transport details")
 	assert.Equal(t, 1, len(imageStore.LoadCalls()))
 }

@@ -291,6 +334,474 @@ func TestImage_ConvertCachingMode(t *testing.T) {
 	assert.Equal(t, `<img src="https://remark42.com/img?src=aHR0cDovL3JhZGlvLXQuY29tL2ltZzMucG5n"/> xyz <img src="https://remark42.com/img?src=aHR0cDovL2ltYWdlcy5wZXhlbHMuY29tLzY3NjM2L2ltZzQuanBlZw==">`, r)
 }

+func TestImage_PrivateIPBlocking(t *testing.T) {
+	imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) { return nil, nil }}
+	img := Image{
+		HTTP2HTTPS:   true,
+		RemarkURL:    "https://demo.remark42.com",
+		RoutePath:    "/api/v1/proxy",
+		Timeout:      100 * time.Millisecond,
+		ImageService: image.NewService(&imageStore, image.ServiceParams{}),
+		// no Transport override — uses SSRF-safe transport
+	}
+
+	ts := httptest.NewServer(http.HandlerFunc(img.Handler))
+	defer ts.Close()
+
+	tbl := []struct {
+		name string
+		url  string
+	}{
+		{"loopback", "http://127.0.0.1/image.png"},
+		{"rfc1918 10.x", "http://10.0.0.1/image.png"},
+		{"rfc1918 172.16.x", "http://172.16.0.1/image.png"},
+		{"rfc1918 192.168.x", "http://192.168.1.1/image.png"},
+		{"link-local", "http://169.254.1.1/image.png"},
+		{"ipv6 loopback", "http://[::1]/image.png"},
+	}
+
+	for _, tt := range tbl {
+		t.Run(tt.name, func(t *testing.T) {
+			encodedImgURL := base64.URLEncoding.EncodeToString([]byte(tt.url))
+			resp, err := http.Get(ts.URL + "/?src=" + encodedImgURL)
+			require.NoError(t, err)
+			b, err := io.ReadAll(resp.Body)
+			assert.NoError(t, resp.Body.Close())
+			require.NoError(t, err)
+			assert.Equal(t, http.StatusNotFound, resp.StatusCode)
+			assert.NotContains(t, string(b), "private address", "should not leak private IP check details")
+			assert.Contains(t, string(b), "failed to fetch")
+		})
+	}
+}
+
+func TestImage_ErrorSanitization(t *testing.T) {
+	// server that immediately closes connections to simulate transport errors
+	httpSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		hj, ok := w.(http.Hijacker)
+		if !ok {
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+		conn, _, _ := hj.Hijack()
+		conn.Close() // forcefully close to trigger transport error
+	}))
+	defer httpSrv.Close()
+
+	imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) { return nil, nil }}
+	img := Image{
+		RemarkURL:    "https://demo.remark42.com",
+		RoutePath:    "/api/v1/proxy",
+		Timeout:      2 * time.Second,
+		ImageService: image.NewService(&imageStore, image.ServiceParams{}),
+		Transport:    http.DefaultTransport,
+	}
+
+	ts := httptest.NewServer(http.HandlerFunc(img.Handler))
+	defer ts.Close()
+
+	encodedImgURL := base64.URLEncoding.EncodeToString([]byte(httpSrv.URL + "/image.png"))
+	resp, err := http.Get(ts.URL + "/?src=" + encodedImgURL)
+	require.NoError(t, err)
+	b, err := io.ReadAll(resp.Body)
+	assert.NoError(t, resp.Body.Close())
+	require.NoError(t, err)
+	assert.Equal(t, http.StatusNotFound, resp.StatusCode)
+	assert.Contains(t, string(b), "failed to fetch")
+	assert.NotContains(t, string(b), "EOF", "should not leak transport details")
+	assert.NotContains(t, string(b), "connection", "should not leak transport details")
+}
+
+func TestImage_ResponseSizeLimit(t *testing.T) {
+	// create a test server that returns a large image
+	largeImg := make([]byte, 2000)
+	for i := range largeImg {
+		largeImg[i] = 0xFF
+	}
+	httpSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.Header().Set("Content-Type", "image/png")
+		_, _ = w.Write(largeImg)
+	}))
+	defer httpSrv.Close()
+
+	imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) { return nil, nil }}
+	img := Image{
+		RemarkURL:    "https://demo.remark42.com",
+		RoutePath:    "/api/v1/proxy",
+		ImageService: image.NewService(&imageStore, image.ServiceParams{MaxSize: 1000}),
+		Transport:    http.DefaultTransport,
+	}
+
+	ts := httptest.NewServer(http.HandlerFunc(img.Handler))
+	defer ts.Close()
+
+	encodedImgURL := base64.URLEncoding.EncodeToString([]byte(httpSrv.URL + "/big-image.png"))
+	resp, err := http.Get(ts.URL + "/?src=" + encodedImgURL)
+	require.NoError(t, err)
+	b, err := io.ReadAll(resp.Body)
+	assert.NoError(t, resp.Body.Close())
+	require.NoError(t, err)
+	assert.Equal(t, http.StatusNotFound, resp.StatusCode)
+	assert.Contains(t, string(b), "failed to fetch")
+}
+
+// TestImage_ContentTypeHandling covers both the rock-solid acceptance of legitimate
+// images and the rejection of content-type-spoofing payloads (the XSS vector where
+// upstream lies about Content-Type and the proxy serves attacker HTML back from the
+// remark42 origin). Every response — accept or reject — must carry the layered
+// defense headers (strict CSP, nosniff, Content-Disposition: inline).
+//
+// The defense must not depend on the upstream Content-Type header: each row controls
+// it independently of the body so the matrix exercises attackers who flip the upstream
+// header on the fly, and polyglot bodies where image magic bytes prefix HTML payloads.
+func TestImage_ContentTypeHandling(t *testing.T) {
+	htmlBody := []byte("<html><body><script>alert(document.domain)</script></body></html>")
+	// polyglot: real PNG magic + trailing HTML. Sniffs as image/png, must be served
+	// as image/png so the browser renders as image (broken or otherwise) — never as HTML.
+	polyglot := append(append([]byte{}, gopherPNGBytes()...), []byte("<script>alert(1)</script>")...)
+
+	tbl := []struct {
+		name          string
+		upstreamCT    string // Content-Type header the upstream sends
+		body          []byte
+		accept        bool   // true: legitimate image, served back; false: attack, rejected
+		wantCT        string // exact Content-Type if accept
+		payloadMarker string // attack substring that must NOT appear in the response body
+	}{
+		// legitimate
+		{name: "real png", upstreamCT: "image/png", body: gopherPNGBytes(), accept: true, wantCT: "image/png"},
+
+		// upstream lies — body is HTML, header varies. All must be rejected at body-sniff.
+		{name: "html body claimed as image/png", upstreamCT: "image/png", body: htmlBody, payloadMarker: "<script>"},
+		{name: "html body claimed as image/jpeg", upstreamCT: "image/jpeg", body: htmlBody, payloadMarker: "<script>"},
+		{name: "html body claimed as image/gif", upstreamCT: "image/gif", body: htmlBody, payloadMarker: "<script>"},
+		// upstream claims svg+xml; body still sniffs as text/html (the stdlib sniffer
+		// never returns image/svg+xml, see rest.SafeImgContentType godoc).
+		{name: "html body upstream claims image/svg+xml", upstreamCT: "image/svg+xml", body: htmlBody, payloadMarker: "<script>"},
+		{name: "html body claimed as image/webp", upstreamCT: "image/webp", body: htmlBody, payloadMarker: "<script>"},
+
+		// svg payloads — even if upstream claims a valid image format, the sniffer sees XML/text and we must reject
+		{
+			name:          "svg with xml declaration and onload",
+			upstreamCT:    "image/png",
+			body:          []byte(`<?xml version="1.0"?><svg xmlns="http://www.w3.org/2000/svg" onload="alert(1)"></svg>`),
+			payloadMarker: "onload",
+		},
+		{
+			name:          "html fragment without doctype",
+			upstreamCT:    "image/png",
+			body:          []byte(`<body><img src=x onerror=alert(1)></body>`),
+			payloadMarker: "onerror",
+		},
+
+		// polyglot — image magic + appended HTML. Sniffs as image/png so we accept and serve as image/png.
+		// Safety comes from the response headers (Content-Type: image/png + X-Content-Type-Options: nosniff),
+		// not from body filtering: the bytes round-trip verbatim by design (assertion below). The browser
+		// cannot execute the trailing HTML when the response type is image/png with nosniff.
+		{name: "polyglot png+html served as png", upstreamCT: "image/png", body: polyglot, accept: true, wantCT: "image/png"},
+	}
+
+	for _, tt := range tbl {
+		t.Run(tt.name, func(t *testing.T) {
+			upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+				w.Header().Set("Content-Type", tt.upstreamCT)
+				_, _ = w.Write(tt.body)
+			}))
+			defer upstream.Close()
+
+			imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) { return nil, nil }}
+			img := Image{
+				RemarkURL:    "https://demo.remark42.com",
+				RoutePath:    "/api/v1/proxy",
+				ImageService: image.NewService(&imageStore, image.ServiceParams{}),
+				Transport:    http.DefaultTransport,
+			}
+
+			ts := httptest.NewServer(http.HandlerFunc(img.Handler))
+			defer ts.Close()
+
+			encodedURL := base64.URLEncoding.EncodeToString([]byte(upstream.URL + "/logo.png"))
+			resp, err := http.Get(ts.URL + "/?src=" + encodedURL)
+			require.NoError(t, err)
+			body, err := io.ReadAll(resp.Body)
+			require.NoError(t, err)
+			require.NoError(t, resp.Body.Close())
+
+			// every response — accept or reject — must carry the defense headers
+			assert.Equal(t, "nosniff", resp.Header.Get("X-Content-Type-Options"))
+			assert.Contains(t, resp.Header.Get("Content-Disposition"), "inline")
+			csp := resp.Header.Get("Content-Security-Policy")
+			assert.Contains(t, csp, "default-src 'none'", "strict CSP missing")
+			assert.Contains(t, csp, "sandbox", "CSP sandbox missing")
+
+			if tt.accept {
+				assert.Equal(t, http.StatusOK, resp.StatusCode)
+				assert.Equal(t, tt.wantCT, resp.Header.Get("Content-Type"))
+				assert.Equal(t, tt.body, body, "body bytes must round-trip")
+				assert.Contains(t, resp.Header.Get("Cache-Control"), "max-age=2592000",
+					"validated success path carries the 30-day TTL")
+				assert.True(t, strings.HasPrefix(resp.Header.Get("Etag"), `"v2:`),
+					"validated success path carries the versioned etag")
+				return
+			}
+
+			// reject path
+			assert.GreaterOrEqual(t, resp.StatusCode, 400, "must reject non-image content")
+			// reject responses must NOT inherit the success path's long-lived cache
+			// headers — a transient 4xx would otherwise be pinned in browser/intermediary
+			// caches alongside the versioned etag for 30 days.
+			assert.Contains(t, resp.Header.Get("Cache-Control"), "no-store",
+				"reject path must set Cache-Control: no-store; got %q", resp.Header.Get("Cache-Control"))
+			assert.NotContains(t, resp.Header.Get("Cache-Control"), "max-age=2592000",
+				"reject path must not carry the success-path 30-day TTL")
+			assert.Empty(t, resp.Header.Get("Etag"),
+				"reject path must not carry the versioned etag (would pin the failure in cache)")
+			ct := resp.Header.Get("Content-Type")
+			assert.False(t, strings.HasPrefix(ct, "text/html"),
+				"reject response must not be text/html; got %q", ct)
+			assert.NotContains(t, string(body), tt.payloadMarker,
+				"reject response must not echo attack payload; got body=%q", string(body))
+		})
+	}
+}
+
+// TestEtagMatches lives in the rest package alongside the shared EtagMatches helper
+// (see backend/app/rest/image_headers_test.go). The proxy handler delegates to it.
+
+// TestImage_ContentTypeHandling_CacheHit exercises the cache-hit branch of the handler:
+// the StoreMock returns attacker bytes directly, so the upstream is never contacted.
+// Without the body-sniff at serve time, pre-fix code would have echoed cached HTML as
+// text/html. After the fix the same content-type defense applies on the cache path.
+func TestImage_ContentTypeHandling_CacheHit(t *testing.T) {
+	htmlBody := []byte("<html><body><script>alert(document.domain)</script></body></html>")
+	polyglot := append(append([]byte{}, gopherPNGBytes()...), []byte("<script>alert(1)</script>")...)
+
+	tbl := []struct {
+		name          string
+		cached        []byte
+		accept        bool
+		wantCT        string
+		payloadMarker string
+	}{
+		{name: "html in cache claimed as image/png", cached: htmlBody, payloadMarker: "<script>"},
+		{name: "polyglot in cache served as png", cached: polyglot, accept: true, wantCT: "image/png"},
+	}
+
+	for _, tt := range tbl {
+		t.Run(tt.name, func(t *testing.T) {
+			imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) {
+				return tt.cached, nil
+			}}
+			img := Image{
+				CacheExternal: true,
+				RemarkURL:     "https://demo.remark42.com",
+				RoutePath:     "/api/v1/proxy",
+				ImageService:  image.NewService(&imageStore, image.ServiceParams{}),
+				// no Transport — cache hit must not reach upstream
+			}
+			ts := httptest.NewServer(http.HandlerFunc(img.Handler))
+			defer ts.Close()
+
+			encodedURL := base64.URLEncoding.EncodeToString([]byte("https://attacker.example.com/logo.png"))
+			resp, err := http.Get(ts.URL + "/?src=" + encodedURL)
+			require.NoError(t, err)
+			body, err := io.ReadAll(resp.Body)
+			require.NoError(t, err)
+			require.NoError(t, resp.Body.Close())
+
+			assert.Equal(t, 1, len(imageStore.LoadCalls()), "served from cache")
+			assert.Equal(t, "nosniff", resp.Header.Get("X-Content-Type-Options"))
+			assert.Contains(t, resp.Header.Get("Content-Disposition"), "inline")
+			assert.Contains(t, resp.Header.Get("Content-Security-Policy"),
+				"default-src 'none'; sandbox; frame-ancestors 'none'")
+
+			if tt.accept {
+				assert.Equal(t, http.StatusOK, resp.StatusCode)
+				assert.Equal(t, tt.wantCT, resp.Header.Get("Content-Type"))
+				return
+			}
+			assert.GreaterOrEqual(t, resp.StatusCode, 400, "must reject non-image cached content")
+			assert.False(t, strings.HasPrefix(resp.Header.Get("Content-Type"), "text/html"),
+				"reject response must not be text/html; got %q", resp.Header.Get("Content-Type"))
+			assert.NotContains(t, string(body), tt.payloadMarker,
+				"reject response must not echo cached attack payload")
+		})
+	}
+}
+
+// TestImage_EtagVersioned proves browser/proxy caches with pre-fix etags (the
+// unversioned base64 of src that used to be served alongside text/html bodies)
+// no longer satisfy revalidation: the server returns a fresh 200 with image
+// content instead of 304-ing the poisoned cached entry. The 30-day Cache-Control
+// max-age is unchanged — local browser caches still serving pre-fix bytes within
+// their TTL are not reached; the prefix only helps clients that revalidate during
+// the cached lifetime (Ctrl+R, intermediaries, post-expiry). See etagVersionPrefix
+// godoc for the tradeoff.
+func TestImage_EtagVersioned(t *testing.T) {
+	imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) { return nil, nil }}
+	img := Image{
+		RemarkURL:    "https://demo.remark42.com",
+		RoutePath:    "/api/v1/proxy",
+		ImageService: image.NewService(&imageStore, image.ServiceParams{}),
+		Transport:    http.DefaultTransport,
+	}
+	ts := httptest.NewServer(http.HandlerFunc(img.Handler))
+	defer ts.Close()
+	httpSrv := imgHTTPTestsServer(t)
+	defer httpSrv.Close()
+
+	srcRaw := httpSrv.URL + "/image/img1.png"
+	encodedSrc := base64.URLEncoding.EncodeToString([]byte(srcRaw))
+	preFixEtag := `"` + encodedSrc + `"` // what a pre-fix browser would have cached
+
+	req, err := http.NewRequest("GET", ts.URL+"/?src="+encodedSrc, http.NoBody)
+	require.NoError(t, err)
+	req.Header.Set("If-None-Match", preFixEtag)
+
+	resp, err := http.DefaultClient.Do(req)
+	require.NoError(t, err)
+	defer resp.Body.Close()
+
+	assert.Equal(t, http.StatusOK, resp.StatusCode,
+		"pre-fix etag must NOT validate as 304 — old cached text/html must be replaced")
+	assert.Equal(t, "image/png", resp.Header.Get("Content-Type"))
+	assert.NotEqual(t, preFixEtag, resp.Header.Get("Etag"), "new etag must differ from pre-fix")
+	assert.True(t, strings.HasPrefix(resp.Header.Get("Etag"), `"v2:`), "new etag must carry the version prefix")
+	cc := resp.Header.Get("Cache-Control")
+	assert.Contains(t, cc, "max-age=2592000", "success path keeps 30-day TTL for cache efficiency")
+
+	// sanity: the NEW etag round-trips as 304 when sent back
+	loadsBefore := len(imageStore.LoadCalls())
+	req2, err := http.NewRequest("GET", ts.URL+"/?src="+encodedSrc, http.NoBody)
+	require.NoError(t, err)
+	req2.Header.Set("If-None-Match", resp.Header.Get("Etag"))
+	resp2, err := http.DefaultClient.Do(req2)
+	require.NoError(t, err)
+	defer resp2.Body.Close()
+	assert.Equal(t, http.StatusNotModified, resp2.StatusCode, "new etag must validate against itself")
+	body, _ := io.ReadAll(resp2.Body)
+	assert.Empty(t, body, "304 must have no body")
+	// 304 path must skip the store lookup entirely — revalidation must not amplify load
+	assert.Equal(t, loadsBefore, len(imageStore.LoadCalls()),
+		"revalidation 304 must not trigger any store Load (avoids upstream DoS amplification)")
+	// 304 path must still carry the layered defense headers
+	assert.Equal(t, "nosniff", resp2.Header.Get("X-Content-Type-Options"))
+	assert.Contains(t, resp2.Header.Get("Content-Disposition"), "inline")
+	assert.Contains(t, resp2.Header.Get("Content-Security-Policy"), "default-src 'none'")
+	assert.Contains(t, resp2.Header.Get("Content-Security-Policy"), "sandbox")
+}
+
+// TestImage_RevalidationSkipsIO proves that a matching current-version If-None-Match
+// short-circuits before any cache lookup or upstream fetch. With no Transport and no
+// upstream server reachable, the only way this test can pass with 304 is if Load is
+// never called and downloadImage is never attempted. This closes the DoS amplification
+// where every reuse on a hot comment page would otherwise re-hit the upstream when
+// CacheExternal is false.
+func TestImage_RevalidationSkipsIO(t *testing.T) {
+	imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) {
+		t.Fatal("Load must not be called on the revalidation short-circuit path")
+		return nil, nil
+	}}
+	img := Image{
+		RemarkURL:    "https://demo.remark42.com",
+		RoutePath:    "/api/v1/proxy",
+		ImageService: image.NewService(&imageStore, image.ServiceParams{}),
+		// no Transport — any downloadImage attempt would also fail
+	}
+	ts := httptest.NewServer(http.HandlerFunc(img.Handler))
+	defer ts.Close()
+
+	encodedSrc := base64.URLEncoding.EncodeToString([]byte("https://example.com/whatever.png"))
+	currentEtag := `"v2:` + encodedSrc + `"`
+
+	req, err := http.NewRequest("GET", ts.URL+"/?src="+encodedSrc, http.NoBody)
+	require.NoError(t, err)
+	req.Header.Set("If-None-Match", currentEtag)
+
+	resp, err := http.DefaultClient.Do(req)
+	require.NoError(t, err)
+	defer resp.Body.Close()
+
+	assert.Equal(t, http.StatusNotModified, resp.StatusCode,
+		"matching current-version etag must short-circuit to 304 without I/O")
+	assert.Equal(t, 0, len(imageStore.LoadCalls()),
+		"revalidation must not trigger store Load")
+	body, _ := io.ReadAll(resp.Body)
+	assert.Empty(t, body, "304 must have no body")
+	// defense headers must still be set on the short-circuit path
+	assert.Equal(t, "nosniff", resp.Header.Get("X-Content-Type-Options"))
+	assert.Contains(t, resp.Header.Get("Content-Disposition"), "inline")
+	assert.Contains(t, resp.Header.Get("Content-Security-Policy"), "default-src 'none'")
+	assert.Contains(t, resp.Header.Get("Content-Security-Policy"), "sandbox")
+	assert.Equal(t, currentEtag, resp.Header.Get("Etag"))
+	assert.Contains(t, resp.Header.Get("Cache-Control"), "max-age=2592000")
+}
+
+// TestImage_PerRequestRevalidation proves the defense holds when upstream flips its
+// response body between requests (give a real PNG once, HTML next time, etc.). Each
+// proxy response is independently validated against the body actually returned, so
+// trust never accumulates and an earlier "good" response cannot grant the next one a
+// free pass.
+func TestImage_PerRequestRevalidation(t *testing.T) {
+	htmlBody := []byte("<html><script>alert(1)</script></html>")
+
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "image/png") // always lie consistently
+		switch r.URL.Path {
+		case "/png":
+			_, _ = w.Write(gopherPNGBytes())
+		case "/html":
+			_, _ = w.Write(htmlBody)
+		}
+	}))
+	defer upstream.Close()
+
+	imageStore := image.StoreMock{LoadFunc: func(string) ([]byte, error) { return nil, nil }}
+	img := Image{
+		RemarkURL:    "https://demo.remark42.com",
+		RoutePath:    "/api/v1/proxy",
+		ImageService: image.NewService(&imageStore, image.ServiceParams{}),
+		Transport:    http.DefaultTransport,
+	}
+	ts := httptest.NewServer(http.HandlerFunc(img.Handler))
+	defer ts.Close()
+
+	// alternate calls: PNG, HTML, PNG, HTML — each must be judged on its own bytes.
+	type step struct {
+		path       string
+		wantStatus int
+		wantCT     string // prefix match
+	}
+	steps := []step{
+		{path: "/png", wantStatus: http.StatusOK, wantCT: "image/png"},
+		{path: "/html", wantStatus: http.StatusUnsupportedMediaType, wantCT: "application/json"},
+		{path: "/png", wantStatus: http.StatusOK, wantCT: "image/png"},
+		{path: "/html", wantStatus: http.StatusUnsupportedMediaType, wantCT: "application/json"},
+	}
+	for i, s := range steps {
+		t.Run(fmt.Sprintf("step_%d_%s", i, s.path), func(t *testing.T) {
+			encodedURL := base64.URLEncoding.EncodeToString([]byte(upstream.URL + s.path))
+			resp, err := http.Get(ts.URL + "/?src=" + encodedURL)
+			require.NoError(t, err)
+			body, _ := io.ReadAll(resp.Body)
+			require.NoError(t, resp.Body.Close())
+
+			assert.Equal(t, s.wantStatus, resp.StatusCode)
+			assert.True(t, strings.HasPrefix(resp.Header.Get("Content-Type"), s.wantCT),
+				"expected Content-Type prefix %q, got %q", s.wantCT, resp.Header.Get("Content-Type"))
+			assert.False(t, strings.HasPrefix(resp.Header.Get("Content-Type"), "text/html"),
+				"must never serve text/html under any flip")
+			assert.NotContains(t, string(body), "<script>",
+				"attacker payload must never appear in response body")
+			// every response must still carry the defense headers
+			assert.Equal(t, "nosniff", resp.Header.Get("X-Content-Type-Options"))
+			assert.Contains(t, resp.Header.Get("Content-Disposition"), "inline")
+			assert.Contains(t, resp.Header.Get("Content-Security-Policy"),
+				"default-src 'none'; sandbox; frame-ancestors 'none'")
+		})
+	}
+}
+
 func imgHTTPTestsServer(t *testing.T) *httptest.Server {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.URL.Path == "/image/img1.png" {
@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"net/http"

-	"github.com/go-pkgz/auth/token"
+	"github.com/go-pkgz/auth/v2/token"

 	"github.com/umputun/remark42/backend/app/store"
 )
@@ -56,7 +56,7 @@ func SetUserInfo(r *http.Request, user store.User) *http.Request {
 		Picture:  user.Picture,
 		IP:       user.IP,
 		Audience: user.SiteID,
-		Attributes: map[string]interface{}{
+		Attributes: map[string]any{
 			"blocked":  user.Blocked,
 			"verified": user.Verified,
 		},
@@ -0,0 +1,86 @@
+// Package safehttp provides HTTP transports hardened against SSRF: outbound
+// connections are dialed using a pre-resolved IP, with a check that all
+// resolved IPs sit outside private/reserved ranges. This blocks both naive
+// SSRF (private IP literals in user-supplied URLs) and DNS rebinding.
+package safehttp
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"net/http"
+	"time"
+)
+
+// Transport returns an *http.Transport whose DialContext refuses any address
+// that resolves to a private/reserved IP, choosing the IP itself for the dial
+// to defeat DNS rebinding (an attacker cannot have the resolver hand back a
+// public IP at the check and a private one at the connect).
+//
+// The returned transport is a clone of http.DefaultTransport with only
+// DialContext overridden, preserving Proxy, HTTP/2, idle/keep-alive and
+// TLS handshake timeouts that bare &http.Transport{} would lose.
+func Transport() *http.Transport {
+	dialer := &net.Dialer{Timeout: 30 * time.Second}
+	t := http.DefaultTransport.(*http.Transport).Clone()
+	t.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+		host, port, err := net.SplitHostPort(addr)
+		if err != nil {
+			return nil, fmt.Errorf("invalid address %s: %w", addr, err)
+		}
+
+		ips, err := net.DefaultResolver.LookupIPAddr(ctx, host)
+		if err != nil {
+			return nil, fmt.Errorf("can't resolve host %s: %w", host, err)
+		}
+		if len(ips) == 0 {
+			return nil, fmt.Errorf("no IP addresses resolved for host %s", host)
+		}
+
+		for _, ip := range ips {
+			if IsPrivateIP(ip.IP) {
+				return nil, fmt.Errorf("access to private address is not allowed")
+			}
+		}
+
+		var lastErr error
+		for _, ip := range ips {
+			conn, dialErr := dialer.DialContext(ctx, network, net.JoinHostPort(ip.String(), port))
+			if dialErr == nil {
+				return conn, nil
+			}
+			lastErr = dialErr
+		}
+		return nil, fmt.Errorf("can't connect to %s: %w", host, lastErr)
+	}
+	return t
+}
+
+// privateCIDRs holds pre-parsed private/reserved CIDR blocks.
+var privateCIDRs = func() []*net.IPNet {
+	cidrs := []string{
+		"10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16",
+		"100.64.0.0/10", "127.0.0.0/8", "169.254.0.0/16",
+		"::1/128", "fc00::/7", "fe80::/10",
+	}
+	blocks := make([]*net.IPNet, 0, len(cidrs))
+	for _, cidr := range cidrs {
+		_, block, _ := net.ParseCIDR(cidr)
+		blocks = append(blocks, block)
+	}
+	return blocks
+}()
+
+// IsPrivateIP reports whether ip falls in any private, loopback, link-local,
+// CGNAT, or reserved range — including IPv4 and IPv6 unspecified addresses.
+func IsPrivateIP(ip net.IP) bool {
+	if ip.IsUnspecified() {
+		return true
+	}
+	for _, block := range privateCIDRs {
+		if block.Contains(ip) {
+			return true
+		}
+	}
+	return false
+}
@@ -0,0 +1,90 @@
+package safehttp
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestIsPrivateIP(t *testing.T) {
+	tbl := []struct {
+		ip      string
+		private bool
+	}{
+		{"127.0.0.1", true},
+		{"10.0.0.1", true},
+		{"10.255.255.255", true},
+		{"172.16.0.1", true},
+		{"172.31.255.255", true},
+		{"192.168.0.1", true},
+		{"192.168.255.255", true},
+		{"169.254.1.1", true},
+		{"100.64.0.1", true},
+		{"100.127.255.255", true},
+		{"::1", true},
+		{"fc00::1", true},
+		{"fe80::1", true},
+		{"0.0.0.0", true},
+		{"::", true},
+		{"8.8.8.8", false},
+		{"203.0.113.1", false},
+		{"1.1.1.1", false},
+		{"2001:db8::1", false},
+	}
+
+	for _, tt := range tbl {
+		t.Run(tt.ip, func(t *testing.T) {
+			ip := net.ParseIP(tt.ip)
+			require.NotNil(t, ip)
+			assert.Equal(t, tt.private, IsPrivateIP(ip))
+		})
+	}
+}
+
+func TestTransport_BlocksPrivate(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer srv.Close()
+
+	client := &http.Client{Transport: Transport(), Timeout: 2 * time.Second}
+	resp, err := client.Get(srv.URL) // httptest.NewServer binds 127.0.0.1
+	if resp != nil {
+		_ = resp.Body.Close()
+	}
+	require.Error(t, err, "private address must be refused")
+	assert.Contains(t, err.Error(), "access to private address is not allowed")
+}
+
+func TestTransport_AllowsPublic(t *testing.T) {
+	tr := Transport()
+	// the policy check must reject the loopback literal
+	_, err := tr.DialContext(context.Background(), "tcp", "127.0.0.1:1")
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "access to private address is not allowed")
+
+	// public IP literal passes the policy check; bound the dial with a tight context
+	// so the test does not depend on real-world routing of TEST-NET-3 (203.0.113.0/24).
+	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
+	defer cancel()
+	_, err = tr.DialContext(ctx, "tcp", "203.0.113.1:1")
+	require.Error(t, err)
+	assert.NotContains(t, err.Error(), "access to private address is not allowed")
+}
+
+func TestTransport_PreservesDefaultTransportSettings(t *testing.T) {
+	def := http.DefaultTransport.(*http.Transport)
+	tr := Transport()
+	assert.NotNil(t, tr.Proxy, "Proxy must be inherited from http.DefaultTransport")
+	assert.Equal(t, def.ForceAttemptHTTP2, tr.ForceAttemptHTTP2, "ForceAttemptHTTP2")
+	assert.Equal(t, def.MaxIdleConns, tr.MaxIdleConns, "MaxIdleConns")
+	assert.Equal(t, def.IdleConnTimeout, tr.IdleConnTimeout, "IdleConnTimeout")
+	assert.Equal(t, def.TLSHandshakeTimeout, tr.TLSHandshakeTimeout, "TLSHandshakeTimeout")
+	assert.Equal(t, def.ExpectContinueTimeout, tr.ExpectContinueTimeout, "ExpectContinueTimeout")
+}
@@ -8,6 +8,9 @@ import (
 	log "github.com/go-pkgz/lgr"
 )

+// NOTE: matryer/moq should be installed globally and works with `go generate ./...`
+//go:generate moq --out admin_mock.go . Store
+
 // Store defines interface returning admins info for given site
 type Store interface {
 	Key(siteID string) (key string, err error)
@@ -0,0 +1,256 @@
+// Code generated by moq; DO NOT EDIT.
+// github.com/matryer/moq
+
+package admin
+
+import (
+	"sync"
+)
+
+// Ensure, that StoreMock does implement Store.
+// If this is not the case, regenerate this file with moq.
+var _ Store = &StoreMock{}
+
+// StoreMock is a mock implementation of Store.
+//
+//	func TestSomethingThatUsesStore(t *testing.T) {
+//
+//		// make and configure a mocked Store
+//		mockedStore := &StoreMock{
+//			AdminsFunc: func(siteID string) ([]string, error) {
+//				panic("mock out the Admins method")
+//			},
+//			EmailFunc: func(siteID string) (string, error) {
+//				panic("mock out the Email method")
+//			},
+//			EnabledFunc: func(siteID string) (bool, error) {
+//				panic("mock out the Enabled method")
+//			},
+//			KeyFunc: func(siteID string) (string, error) {
+//				panic("mock out the Key method")
+//			},
+//			OnEventFunc: func(siteID string, et EventType) error {
+//				panic("mock out the OnEvent method")
+//			},
+//		}
+//
+//		// use mockedStore in code that requires Store
+//		// and then make assertions.
+//
+//	}
+type StoreMock struct {
+	// AdminsFunc mocks the Admins method.
+	AdminsFunc func(siteID string) ([]string, error)
+
+	// EmailFunc mocks the Email method.
+	EmailFunc func(siteID string) (string, error)
+
+	// EnabledFunc mocks the Enabled method.
+	EnabledFunc func(siteID string) (bool, error)
+
+	// KeyFunc mocks the Key method.
+	KeyFunc func(siteID string) (string, error)
+
+	// OnEventFunc mocks the OnEvent method.
+	OnEventFunc func(siteID string, et EventType) error
+
+	// calls tracks calls to the methods.
+	calls struct {
+		// Admins holds details about calls to the Admins method.
+		Admins []struct {
+			// SiteID is the siteID argument value.
+			SiteID string
+		}
+		// Email holds details about calls to the Email method.
+		Email []struct {
+			// SiteID is the siteID argument value.
+			SiteID string
+		}
+		// Enabled holds details about calls to the Enabled method.
+		Enabled []struct {
+			// SiteID is the siteID argument value.
+			SiteID string
+		}
+		// Key holds details about calls to the Key method.
+		Key []struct {
+			// SiteID is the siteID argument value.
+			SiteID string
+		}
+		// OnEvent holds details about calls to the OnEvent method.
+		OnEvent []struct {
+			// SiteID is the siteID argument value.
+			SiteID string
+			// Et is the et argument value.
+			Et EventType
+		}
+	}
+	lockAdmins  sync.RWMutex
+	lockEmail   sync.RWMutex
+	lockEnabled sync.RWMutex
+	lockKey     sync.RWMutex
+	lockOnEvent sync.RWMutex
+}
+
+// Admins calls AdminsFunc.
+func (mock *StoreMock) Admins(siteID string) ([]string, error) {
+	if mock.AdminsFunc == nil {
+		panic("StoreMock.AdminsFunc: method is nil but Store.Admins was just called")
+	}
+	callInfo := struct {
+		SiteID string
+	}{
+		SiteID: siteID,
+	}
+	mock.lockAdmins.Lock()
+	mock.calls.Admins = append(mock.calls.Admins, callInfo)
+	mock.lockAdmins.Unlock()
+	return mock.AdminsFunc(siteID)
+}
+
+// AdminsCalls gets all the calls that were made to Admins.
+// Check the length with:
+//
+//	len(mockedStore.AdminsCalls())
+func (mock *StoreMock) AdminsCalls() []struct {
+	SiteID string
+} {
+	var calls []struct {
+		SiteID string
+	}
+	mock.lockAdmins.RLock()
+	calls = mock.calls.Admins
+	mock.lockAdmins.RUnlock()
+	return calls
+}
+
+// Email calls EmailFunc.
+func (mock *StoreMock) Email(siteID string) (string, error) {
+	if mock.EmailFunc == nil {
+		panic("StoreMock.EmailFunc: method is nil but Store.Email was just called")
+	}
+	callInfo := struct {
+		SiteID string
+	}{
+		SiteID: siteID,
+	}
+	mock.lockEmail.Lock()
+	mock.calls.Email = append(mock.calls.Email, callInfo)
+	mock.lockEmail.Unlock()
+	return mock.EmailFunc(siteID)
+}
+
+// EmailCalls gets all the calls that were made to Email.
+// Check the length with:
+//
+//	len(mockedStore.EmailCalls())
+func (mock *StoreMock) EmailCalls() []struct {
+	SiteID string
+} {
+	var calls []struct {
+		SiteID string
+	}
+	mock.lockEmail.RLock()
+	calls = mock.calls.Email
+	mock.lockEmail.RUnlock()
+	return calls
+}
+
+// Enabled calls EnabledFunc.
+func (mock *StoreMock) Enabled(siteID string) (bool, error) {
+	if mock.EnabledFunc == nil {
+		panic("StoreMock.EnabledFunc: method is nil but Store.Enabled was just called")
+	}
+	callInfo := struct {
+		SiteID string
+	}{
+		SiteID: siteID,
+	}
+	mock.lockEnabled.Lock()
+	mock.calls.Enabled = append(mock.calls.Enabled, callInfo)
+	mock.lockEnabled.Unlock()
+	return mock.EnabledFunc(siteID)
+}
+
+// EnabledCalls gets all the calls that were made to Enabled.
+// Check the length with:
+//
+//	len(mockedStore.EnabledCalls())
+func (mock *StoreMock) EnabledCalls() []struct {
+	SiteID string
+} {
+	var calls []struct {
+		SiteID string
+	}
+	mock.lockEnabled.RLock()
+	calls = mock.calls.Enabled
+	mock.lockEnabled.RUnlock()
+	return calls
+}
+
+// Key calls KeyFunc.
+func (mock *StoreMock) Key(siteID string) (string, error) {
+	if mock.KeyFunc == nil {
+		panic("StoreMock.KeyFunc: method is nil but Store.Key was just called")
+	}
+	callInfo := struct {
+		SiteID string
+	}{
+		SiteID: siteID,
+	}
+	mock.lockKey.Lock()
+	mock.calls.Key = append(mock.calls.Key, callInfo)
+	mock.lockKey.Unlock()
+	return mock.KeyFunc(siteID)
+}
+
+// KeyCalls gets all the calls that were made to Key.
+// Check the length with:
+//
+//	len(mockedStore.KeyCalls())
+func (mock *StoreMock) KeyCalls() []struct {
+	SiteID string
+} {
+	var calls []struct {
+		SiteID string
+	}
+	mock.lockKey.RLock()
+	calls = mock.calls.Key
+	mock.lockKey.RUnlock()
+	return calls
+}
+
+// OnEvent calls OnEventFunc.
+func (mock *StoreMock) OnEvent(siteID string, et EventType) error {
+	if mock.OnEventFunc == nil {
+		panic("StoreMock.OnEventFunc: method is nil but Store.OnEvent was just called")
+	}
+	callInfo := struct {
+		SiteID string
+		Et     EventType
+	}{
+		SiteID: siteID,
+		Et:     et,
+	}
+	mock.lockOnEvent.Lock()
+	mock.calls.OnEvent = append(mock.calls.OnEvent, callInfo)
+	mock.lockOnEvent.Unlock()
+	return mock.OnEventFunc(siteID, et)
+}
+
+// OnEventCalls gets all the calls that were made to OnEvent.
+// Check the length with:
+//
+//	len(mockedStore.OnEventCalls())
+func (mock *StoreMock) OnEventCalls() []struct {
+	SiteID string
+	Et     EventType
+} {
+	var calls []struct {
+		SiteID string
+		Et     EventType
+	}
+	mock.lockOnEvent.RLock()
+	calls = mock.calls.OnEvent
+	mock.lockOnEvent.RUnlock()
+	return calls
+}
@@ -6,6 +6,20 @@ import (
 	"github.com/stretchr/testify/assert"
 )

+func TestStaticStore_StoreWithoutSites(t *testing.T) {
+	var ks Store = NewStaticKeyStore("key123")
+	enabled, err := ks.Enabled("any")
+	assert.NoError(t, err)
+	assert.True(t, enabled, "on empty store all sites are enabled")
+	assert.NoError(t, ks.OnEvent("test", EvCreate), "static store does nothing OnEvent")
+
+	// empty key
+	ks = NewStaticKeyStore("")
+	key, err := ks.Key("any")
+	assert.Error(t, err, "empty key")
+	assert.Empty(t, key)
+}
+
 func TestStaticStore_Get(t *testing.T) {
 	var ks Store = NewStaticStore("key123", []string{"s1", "s2", "s3"},
 		[]string{"123", "xyz"}, "aa@example.com")
@@ -45,11 +45,13 @@ type Edit struct {

 // PostInfo holds summary for given post url
 type PostInfo struct {
-	URL      string    `json:"url"`
-	Count    int       `json:"count"`
-	ReadOnly bool      `json:"read_only,omitempty" bson:"read_only,omitempty"`
-	FirstTS  time.Time `json:"first_time,omitempty" bson:"first_time,omitempty"`
-	LastTS   time.Time `json:"last_time,omitempty" bson:"last_time,omitempty"`
+	URL         string    `json:"url,omitempty"` // can be attached to site-wide comments but won't be set then
+	Count       int       `json:"count"`
+	CountLeft   int       `json:"count_left"`                                     // used only with returning search results limited by number, otherwise zero
+	LastComment string    `json:"last_comment,omitempty"`                         // used only with returning search results limited by number
+	ReadOnly    bool      `json:"read_only,omitempty" bson:"read_only,omitempty"` // can be attached to site-wide comments but won't be set then
+	FirstTS     time.Time `json:"first_time" bson:"first_time,omitempty"`
+	LastTS      time.Time `json:"last_time" bson:"last_time,omitempty"`
 }

 // BlockedUser holds id and ts for blocked user
@@ -98,6 +100,7 @@ func (c *Comment) SetDeleted(mode DeleteMode) {
 	c.Text = ""
 	c.Orig = ""
 	c.Score = 0
+	c.Controversy = 0
 	c.Votes = map[string]bool{}
 	c.VotedIPs = make(map[string]VotedIPInfo)
 	c.Edit = nil
@@ -141,7 +144,7 @@ func (c *Comment) Snippet(limit int) string {
 	if limit <= 0 {
 		limit = snippetLen
 	}
-	cleanText := strings.Replace(c.Text, "\n", " ", -1)
+	cleanText := strings.ReplaceAll(c.Text, "\n", " ")
 	size := len([]rune(cleanText))
 	if size < limit {
 		return cleanText
@@ -154,7 +157,7 @@ func (c *Comment) Snippet(limit int) string {
 			break
 		}
 	}
-	// Don't add a space if comment is just a one single word which has been truncated.
+	// don't add a space if comment is just a one single word which has been truncated.
 	if len(snippet) == limit {
 		return string(snippet) + "..."
 	}
@@ -176,14 +179,14 @@ func (c *Comment) SanitizeAsURL(inp string) string {

 func (c *Comment) escapeHTMLWithSome(inp string) string {
 	res := template.HTMLEscapeString(inp)
-	res = strings.Replace(res, "&amp;", "&", -1)
-	res = strings.Replace(res, "&#34;", "\"", -1)
-	res = strings.Replace(res, "&#39;", "'", -1)
+	res = strings.ReplaceAll(res, "&amp;", "&")
+	res = strings.ReplaceAll(res, "&#34;", "\"")
+	res = strings.ReplaceAll(res, "&#39;", "'")
 	return res
 }

-// SanitizeText used to sanitize any input string
+// SanitizeText used to sanitize any input string, and removes any HTML tags
 func (c *Comment) SanitizeText(inp string) string {
-	clean := bluemonday.UGCPolicy().Sanitize(inp)
-	return c.escapeHTMLWithSome(clean)
+	clean := bluemonday.StrictPolicy().Sanitize(inp)
+	return strings.TrimSpace(c.escapeHTMLWithSome(clean))
 }
@@ -22,7 +22,7 @@ func TestComment_Sanitize(t *testing.T) {
 			},
 			out: Comment{
 				Text: "blah XSS\n\t",
-				User: User{ID: `&lt;a href=&#34;http://blah.com&#34;&gt;username&lt;/a&gt;`, Name: "name &lt;b/&gt;"},
+				User: User{ID: `&lt;a href=&#34;http://blah.com&#34;&gt;username&lt;/a&gt;`, Name: "name"},
 			},
 		},
 		{
@@ -88,6 +88,14 @@ func TestComment_Sanitize(t *testing.T) {
 			inp: Comment{Text: "blah blah", PostTitle: "<script>alert()</script>something"},
 			out: Comment{Text: "blah blah", PostTitle: "something"},
 		},
+		{
+			inp: Comment{Text: "blah blah", PostTitle: "<a href=\"https://example.com\">test</a>"},
+			out: Comment{Text: "blah blah", PostTitle: "test"},
+		},
+		{
+			inp: Comment{Text: "blah blah", PostTitle: "https://example.com/blah"}, // link is left as-is, but not rendered as <a>
+			out: Comment{Text: "blah blah", PostTitle: "https://example.com/blah"},
+		},
 		{
 			inp: Comment{Text: `<blockquote class="twitter-tweet"><p lang="es" dir="ltr">Silicon iMac Concept<a href="https://t.co/7ga95QxVXn">https://t.co/7ga95QxVXn</a> by <a href="https://twitter.com/marcsheep?ref_src=twsrc%5Etfw">@marcsheep</a> <a href="https://t.co/ULnVpG8w55">pic.twitter.com/ULnVpG8w55</a></p>&mdash; Andreas Storm (@avstorm) <a href="https://twitter.com/avstorm/status/1325693387798933504?ref_src=twsrc%5Etfw">November 9, 2020</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>`, PostTitle: "Twitter quote"},
 			out: Comment{Text: `<blockquote class="twitter-tweet"><p lang="es" dir="ltr">Silicon iMac Concept<a href="https://t.co/7ga95QxVXn" rel="nofollow">https://t.co/7ga95QxVXn</a> by <a href="https://twitter.com/marcsheep?ref_src=twsrc%5Etfw" rel="nofollow">@marcsheep</a> <a href="https://t.co/ULnVpG8w55" rel="nofollow">pic.twitter.com/ULnVpG8w55</a></p>— Andreas Storm (@avstorm) <a href="https://twitter.com/avstorm/status/1325693387798933504?ref_src=twsrc%5Etfw" rel="nofollow">November 9, 2020</a></blockquote> `, PostTitle: "Twitter quote"},
@@ -112,7 +120,7 @@ func TestComment_PrepareUntrusted(t *testing.T) {
 		Score:       10,
 		Pin:         true,
 		Deleted:     true,
-		Timestamp:   time.Date(2018, 1, 1, 9, 30, 0, 0, time.Local),
+		Timestamp:   time.Date(2018, 1, 1, 9, 30, 0, 0, time.UTC),
 		Votes:       map[string]bool{"uu": true},
 		Controversy: 123,
 		Imported:    true,
@@ -142,7 +150,7 @@ func TestComment_SetDeleted(t *testing.T) {
 		Locator:   Locator{SiteID: "site", URL: "url"},
 		Score:     10,
 		Deleted:   false,
-		Timestamp: time.Date(2018, 1, 1, 9, 30, 0, 0, time.Local),
+		Timestamp: time.Date(2018, 1, 1, 9, 30, 0, 0, time.UTC),
 		Votes:     map[string]bool{"uu": true},
 		Pin:       true,
 	}
@@ -169,7 +177,7 @@ func TestComment_SetDeletedHard(t *testing.T) {
 		Locator:   Locator{SiteID: "site", URL: "url"},
 		Score:     10,
 		Deleted:   false,
-		Timestamp: time.Date(2018, 1, 1, 9, 30, 0, 0, time.Local),
+		Timestamp: time.Date(2018, 1, 1, 9, 30, 0, 0, time.UTC),
 		Votes:     map[string]bool{"uu": true},
 		Pin:       true,
 	}
@@ -201,7 +209,6 @@ func TestComment_Snippet(t *testing.T) {
 	}

 	for i, tt := range tbl {
-		tt := tt
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			c := Comment{Text: tt.inp}
 			out := c.Snippet(tt.limit)
@@ -237,7 +244,6 @@ func TestComment_sanitizeAsURL(t *testing.T) {
 	}

 	for i, tt := range tbl {
-		tt := tt
 		c := Comment{}
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			assert.Equal(t, tt.out, c.SanitizeAsURL(tt.inp))
@@ -263,12 +269,11 @@ func TestComment_sanitizeText(t *testing.T) {
 		},
 		{
 			"<a href=javascript:alert(document.domain)//>xxx</a>",
-			"xxx&lt;/a&gt;",
+			"xxx",
 		},
 	}

 	for i, tt := range tbl {
-		tt := tt
 		c := Comment{}
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			assert.Equal(t, tt.out, c.SanitizeText(tt.inp))
@@ -170,7 +170,7 @@ func (b *BoltDB) Find(req FindRequest) (comments []store.Comment, err error) {
 				return e
 			}

-			return bucket.ForEach(func(k, v []byte) error {
+			return bucket.ForEach(func(_, v []byte) error {
 				comment := store.Comment{}
 				if e = json.Unmarshal(v, &comment); e != nil {
 					return fmt.Errorf("failed to unmarshal: %w", e)
@@ -306,9 +306,8 @@ func (b *BoltDB) Info(req InfoRequest) ([]store.PostInfo, error) {
 		})

 		// set read-only from age and manual bucket
-		readOnlyAge := req.ReadOnlyAge
-		info.ReadOnly = readOnlyAge > 0 && !info.FirstTS.IsZero() && info.FirstTS.AddDate(0, 0, readOnlyAge).Before(time.Now())
-		if b.checkFlag(FlagRequest{Locator: req.Locator, Flag: ReadOnly}) {
+		info.ReadOnly = req.ReadOnlyAge > 0 && !info.FirstTS.IsZero() && info.FirstTS.AddDate(0, 0, req.ReadOnlyAge).Before(time.Now())
+		if !info.ReadOnly && b.checkFlag(FlagRequest{Locator: req.Locator, Flag: ReadOnly}) {
 			info.ReadOnly = true
 		}
 		return []store.PostInfo{info}, err
@@ -347,13 +346,13 @@ func (b *BoltDB) Info(req InfoRequest) ([]store.PostInfo, error) {

 // ListFlags get list of flagged keys, like blocked & verified user
 // works for full locator (post flags) or with userID
-func (b *BoltDB) ListFlags(req FlagRequest) (res []interface{}, err error) {
+func (b *BoltDB) ListFlags(req FlagRequest) (res []any, err error) {
 	bdb, e := b.db(req.Locator.SiteID)
 	if e != nil {
 		return nil, e
 	}

-	res = []interface{}{}
+	res = []any{}
 	switch req.Flag {
 	case Verified:
 		err = bdb.View(func(tx *bolt.Tx) error {
@@ -425,11 +424,11 @@ func (b *BoltDB) Close() error {
 }

 // Last returns up to max last comments for given siteID
-func (b *BoltDB) lastComments(siteID string, max int, since time.Time) (comments []store.Comment, err error) {
+func (b *BoltDB) lastComments(siteID string, maximum int, since time.Time) (comments []store.Comment, err error) {
 	comments = []store.Comment{}

-	if max > lastLimit || max == 0 {
-		max = lastLimit
+	if maximum > lastLimit || maximum == 0 {
+		maximum = lastLimit
 	}

 	bdb, err := b.db(siteID)
@@ -467,7 +466,7 @@ func (b *BoltDB) lastComments(siteID string, max int, since time.Time) (comments
 				continue
 			}
 			comments = append(comments, comment)
-			if len(comments) >= max {
+			if len(comments) >= maximum {
 				break
 			}
 		}
@@ -725,7 +724,7 @@ func (b *BoltDB) listDetails(loc store.Locator) (result []UserDetailEntry, err e
 	err = bdb.View(func(tx *bolt.Tx) error {
 		var entry UserDetailEntry
 		bucket := tx.Bucket([]byte(userDetailsBucketName))
-		return bucket.ForEach(func(userID, value []byte) error {
+		return bucket.ForEach(func(_, value []byte) error {
 			if err = json.Unmarshal(value, &entry); err != nil {
 				return fmt.Errorf("failed to unmarshal entry: %w", e)
 			}
@@ -866,11 +865,10 @@ func (b *BoltDB) deleteUser(bdb *bolt.DB, siteID, userID string, mode store.Dele
 	// get list of commentID for all user's comment
 	comments := []commentInfo{}
 	for _, postInfo := range posts {
-		postInfo := postInfo
 		err = bdb.View(func(tx *bolt.Tx) error {
 			postsBkt := tx.Bucket([]byte(postsBucketName))
 			postBkt := postsBkt.Bucket([]byte(postInfo.URL))
-			err = postBkt.ForEach(func(postURL []byte, commentVal []byte) error {
+			err = postBkt.ForEach(func(_ []byte, commentVal []byte) error {
 				comment := store.Comment{}
 				if err = json.Unmarshal(commentVal, &comment); err != nil {
 					return fmt.Errorf("failed to unmarshal: %w", err)
@@ -959,7 +957,7 @@ func (b *BoltDB) getUserBucket(tx *bolt.Tx, userID string) (*bolt.Bucket, error)
 }

 // save marshaled value to key for bucket. Should run in update tx
-func (b *BoltDB) save(bkt *bolt.Bucket, key string, value interface{}) (err error) {
+func (b *BoltDB) save(bkt *bolt.Bucket, key string, value any) (err error) {
 	if value == nil {
 		return fmt.Errorf("can't save nil value for %s", key)
 	}
@@ -974,7 +972,7 @@ func (b *BoltDB) save(bkt *bolt.Bucket, key string, value interface{}) (err erro
 }

 // load and unmarshal json value by key from bucket. Should run in view tx
-func (b *BoltDB) load(bkt *bolt.Bucket, key string, res interface{}) error {
+func (b *BoltDB) load(bkt *bolt.Bucket, key string, res any) error {
 	value := bkt.Get([]byte(key))
 	if value == nil {
 		return fmt.Errorf("no value for %s", key)
@@ -1029,7 +1027,7 @@ func (b *BoltDB) db(siteID string) (*bolt.DB, error) {

 // makeRef creates reference combining url and comment id
 func (b *BoltDB) makeRef(comment store.Comment) []byte {
-	return []byte(fmt.Sprintf("%s!!%s", comment.Locator.URL, comment.ID))
+	return fmt.Appendf(nil, "%s!!%s", comment.Locator.URL, comment.ID)
 }

 // parseRef gets parts of reference
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"testing"
+	"testing/synctest"
 	"time"

 	"github.com/stretchr/testify/assert"
@@ -48,7 +49,7 @@ func TestBoltDB_CreateFailedReadOnly(t *testing.T) {
 	comment := store.Comment{
 		ID:        "id-ro",
 		Text:      `some text, <a href="http://radio-t.com">link</a>`,
-		Timestamp: time.Date(2017, 12, 20, 15, 18, 22, 0, time.Local),
+		Timestamp: time.Date(2017, 12, 20, 15, 18, 22, 0, time.UTC),
 		Locator:   store.Locator{URL: "https://radio-t.com/ro", SiteID: "radio-t"},
 		User:      store.User{ID: "user1", Name: "user name"},
 	}
@@ -147,20 +148,20 @@ func TestBoltDB_FindLastSince(t *testing.T) {
 	var b, teardown = prep(t)
 	defer teardown()

-	ts := time.Date(2017, 12, 20, 15, 18, 21, 0, time.Local)
+	ts := time.Date(2017, 12, 20, 15, 18, 21, 0, time.UTC)
 	req := FindRequest{Locator: store.Locator{SiteID: "radio-t"}, Sort: "-time", Since: ts}
 	res, err := b.Find(req)
 	assert.NoError(t, err)
 	require.Equal(t, 2, len(res))
 	assert.Equal(t, "some text2", res[0].Text)

-	req.Since = time.Date(2017, 12, 20, 15, 18, 22, 0, time.Local)
+	req.Since = time.Date(2017, 12, 20, 15, 18, 22, 0, time.UTC)
 	res, err = b.Find(req)
 	assert.NoError(t, err)
 	require.Equal(t, 1, len(res))
 	assert.Equal(t, "some text2", res[0].Text)

-	req.Since = time.Date(2017, 12, 20, 16, 18, 22, 0, time.Local)
+	req.Since = time.Date(2017, 12, 20, 16, 18, 22, 0, time.UTC)
 	res, err = b.Find(req)
 	assert.NoError(t, err)
 	assert.Equal(t, 0, len(res))
@@ -170,20 +171,20 @@ func TestBoltDB_FindInPostSince(t *testing.T) {
 	var b, teardown = prep(t)
 	defer teardown()

-	ts := time.Date(2017, 12, 20, 15, 18, 21, 0, time.Local)
+	ts := time.Date(2017, 12, 20, 15, 18, 21, 0, time.UTC)
 	req := FindRequest{Locator: store.Locator{URL: "https://radio-t.com", SiteID: "radio-t"}, Sort: "-time", Since: ts}
 	res, err := b.Find(req)
 	assert.NoError(t, err)
 	require.Equal(t, 2, len(res))
 	assert.Equal(t, "some text2", res[0].Text)

-	req.Since = time.Date(2017, 12, 20, 15, 18, 22, 0, time.Local)
+	req.Since = time.Date(2017, 12, 20, 15, 18, 22, 0, time.UTC)
 	res, err = b.Find(req)
 	assert.NoError(t, err)
 	require.Equal(t, 1, len(res))
 	assert.Equal(t, "some text2", res[0].Text)

-	req.Since = time.Date(2017, 12, 20, 16, 18, 22, 0, time.Local)
+	req.Since = time.Date(2017, 12, 20, 16, 18, 22, 0, time.UTC)
 	res, err = b.Find(req)
 	assert.NoError(t, err)
 	assert.Equal(t, 0, len(res))
@@ -236,10 +237,10 @@ func TestBoltDB_FindForUserPagination(t *testing.T) {
 	}

 	// write 200 comments
-	for i := 0; i < 200; i++ {
+	for i := range 200 {
 		c.ID = fmt.Sprintf("id-%d", i)
 		c.Text = fmt.Sprintf("text #%d", i)
-		c.Timestamp = time.Date(2017, 12, 20, 15, 18, i, 0, time.Local)
+		c.Timestamp = time.Date(2017, 12, 20, 15, 18, i, 0, time.UTC)
 		_, err = b.Create(c)
 		require.NoError(t, err)
 	}
@@ -324,13 +325,13 @@ func TestBoltDB_InfoPost(t *testing.T) {
 	b, teardown := prep(t) // two comments for https://radio-t.com
 	defer teardown()

-	ts := func(min int) time.Time { return time.Date(2017, 12, 20, 15, 18, min, 0, time.Local) }
+	ts := func(minute int) time.Time { return time.Date(2017, 12, 20, 15, 18, minute, 0, time.UTC) }

 	// add one more for https://radio-t.com/2
 	comment := store.Comment{
 		ID:        "12345",
 		Text:      `some text, <a href="http://radio-t.com">link</a>`,
-		Timestamp: time.Date(2017, 12, 20, 15, 18, 24, 0, time.Local),
+		Timestamp: time.Date(2017, 12, 20, 15, 18, 24, 0, time.UTC),
 		Locator:   store.Locator{URL: "https://radio-t.com/2", SiteID: "radio-t"},
 		User:      store.User{ID: "user1", Name: "user name"},
 	}
@@ -379,14 +380,14 @@ func TestBoltDB_InfoList(t *testing.T) {
 	comment := store.Comment{
 		ID:        "12345",
 		Text:      `some text, <a href="http://radio-t.com">link</a>`,
-		Timestamp: time.Date(2017, 12, 20, 15, 18, 22, 0, time.Local),
+		Timestamp: time.Date(2017, 12, 20, 15, 18, 22, 0, time.UTC),
 		Locator:   store.Locator{URL: "https://radio-t.com/2", SiteID: "radio-t"},
 		User:      store.User{ID: "user1", Name: "user name"},
 	}
 	_, err := b.Create(comment)
 	assert.NoError(t, err)

-	ts := func(sec int) time.Time { return time.Date(2017, 12, 20, 15, 18, sec, 0, time.Local) }
+	ts := func(sec int) time.Time { return time.Date(2017, 12, 20, 15, 18, sec, 0, time.UTC) }

 	req := InfoRequest{Locator: store.Locator{SiteID: "radio-t"}}
 	res, err := b.Info(req)
@@ -540,7 +541,7 @@ func TestBolt_FlagListVerified(t *testing.T) {
 	b, teardown := prep(t)
 	defer teardown()

-	toIDs := func(inp []interface{}) (res []string) {
+	toIDs := func(inp []any) (res []string) {
 		res = make([]string, len(inp))
 		for i, v := range inp {
 			vv, ok := v.(string)
@@ -571,47 +572,49 @@ func TestBolt_FlagListVerified(t *testing.T) {
 }

 func TestBolt_FlagListBlocked(t *testing.T) {
-	b, teardown := prep(t)
-	defer teardown()
+	synctest.Test(t, func(t *testing.T) {
+		b, teardown := prep(t)
+		defer teardown()

-	setBlocked := func(site, user string, status FlagStatus, ttl time.Duration) error {
-		req := FlagRequest{Flag: Blocked, Locator: store.Locator{SiteID: site}, UserID: user, Update: status, TTL: ttl}
-		_, err := b.Flag(req)
-		return err
-	}
-
-	toBlocked := func(inp []interface{}) (res []store.BlockedUser) {
-		res = make([]store.BlockedUser, len(inp))
-		for i, v := range inp {
-			vv, ok := v.(store.BlockedUser)
-			require.True(t, ok)
-			res[i] = vv
+		setBlocked := func(site, user string, status FlagStatus, ttl time.Duration) error {
+			req := FlagRequest{Flag: Blocked, Locator: store.Locator{SiteID: site}, UserID: user, Update: status, TTL: ttl}
+			_, err := b.Flag(req)
+			return err
 		}
-		return res
-	}
-	assert.NoError(t, setBlocked("radio-t", "user1", FlagTrue, 0))
-	assert.NoError(t, setBlocked("radio-t", "user2", FlagTrue, 150*time.Millisecond))
-	assert.NoError(t, setBlocked("radio-t", "user3", FlagFalse, 0))

-	vv, err := b.ListFlags(FlagRequest{Flag: Blocked, Locator: store.Locator{SiteID: "radio-t"}})
-	assert.NoError(t, err)
+		toBlocked := func(inp []any) (res []store.BlockedUser) {
+			res = make([]store.BlockedUser, len(inp))
+			for i, v := range inp {
+				vv, ok := v.(store.BlockedUser)
+				require.True(t, ok)
+				res[i] = vv
+			}
+			return res
+		}
+		assert.NoError(t, setBlocked("radio-t", "user1", FlagTrue, 0))
+		assert.NoError(t, setBlocked("radio-t", "user2", FlagTrue, 150*time.Millisecond))
+		assert.NoError(t, setBlocked("radio-t", "user3", FlagFalse, 0))

-	blockedList := toBlocked(vv)
-	require.Equal(t, 2, len(blockedList))
-	assert.Equal(t, "user1", blockedList[0].ID)
-	assert.Equal(t, "user2", blockedList[1].ID)
-	t.Logf("%+v", blockedList)
+		vv, err := b.ListFlags(FlagRequest{Flag: Blocked, Locator: store.Locator{SiteID: "radio-t"}})
+		assert.NoError(t, err)

-	// check block expiration
-	time.Sleep(150 * time.Millisecond)
-	vv, err = b.ListFlags(FlagRequest{Flag: Blocked, Locator: store.Locator{SiteID: "radio-t"}})
-	assert.NoError(t, err)
-	blockedList = toBlocked(vv)
-	require.Equal(t, 1, len(blockedList))
-	assert.Equal(t, "user1", blockedList[0].ID)
+		blockedList := toBlocked(vv)
+		require.Equal(t, 2, len(blockedList))
+		assert.Equal(t, "user1", blockedList[0].ID)
+		assert.Equal(t, "user2", blockedList[1].ID)
+		t.Logf("%+v", blockedList)

-	_, err = b.ListFlags(FlagRequest{Flag: Blocked, Locator: store.Locator{SiteID: "bad"}})
-	assert.EqualError(t, err, `site "bad" not found`)
+		// check block expiration
+		time.Sleep(150 * time.Millisecond)
+		vv, err = b.ListFlags(FlagRequest{Flag: Blocked, Locator: store.Locator{SiteID: "radio-t"}})
+		assert.NoError(t, err)
+		blockedList = toBlocked(vv)
+		require.Equal(t, 1, len(blockedList))
+		assert.Equal(t, "user1", blockedList[0].ID)
+
+		_, err = b.ListFlags(FlagRequest{Flag: Blocked, Locator: store.Locator{SiteID: "bad"}})
+		assert.EqualError(t, err, `site "bad" not found`)
+	})
 }

 func TestBoltDB_UserDetail(t *testing.T) {
@@ -890,7 +893,7 @@ func TestBoltDB_ref(t *testing.T) {
 	comment := store.Comment{
 		ID:        "12345",
 		Text:      `some text, <a href="http://radio-t.com">link</a>`,
-		Timestamp: time.Date(2017, 12, 20, 15, 18, 22, 0, time.Local),
+		Timestamp: time.Date(2017, 12, 20, 15, 18, 22, 0, time.UTC),
 		Locator:   store.Locator{URL: "https://radio-t.com/2", SiteID: "radio-t"},
 		User:      store.User{ID: "user1", Name: "user name"},
 	}
@@ -929,7 +932,7 @@ func prep(t *testing.T) (b *BoltDB, teardown func()) {
 	comment := store.Comment{
 		ID:        "id-1",
 		Text:      `some text, <a href="http://radio-t.com">link</a>`,
-		Timestamp: time.Date(2017, 12, 20, 15, 18, 22, 0, time.Local),
+		Timestamp: time.Date(2017, 12, 20, 15, 18, 22, 0, time.UTC),
 		Locator:   store.Locator{URL: "https://radio-t.com", SiteID: "radio-t"},
 		User:      store.User{ID: "user1", Name: "user name"},
 	}
@@ -939,7 +942,7 @@ func prep(t *testing.T) (b *BoltDB, teardown func()) {
 	comment = store.Comment{
 		ID:        "id-2",
 		Text:      "some text2",
-		Timestamp: time.Date(2017, 12, 20, 15, 18, 23, 0, time.Local),
+		Timestamp: time.Date(2017, 12, 20, 15, 18, 23, 0, time.UTC),
 		Locator:   store.Locator{URL: "https://radio-t.com", SiteID: "radio-t"},
 		User:      store.User{ID: "user1", Name: "user name"},
 	}
--- a/Show More
+++ b/Show More