* fix(s3): honor MetadataDirective=REPLACE for system metadata on CopyObject
* fix(s3): match copy metadata keys case-insensitively for legacy data
Legacy / non-S3 write paths (FUSE mount, direct filer HTTP API, older
versions) may persist Cache-Control etc. in lowercase form. Make
isManagedCopyMetadataKey case-insensitive so mergeCopyMetadata still
clears stale source values under REPLACE, and let the COPY branch of
processMetadataBytes fall back to a lowercase key on the source so
legacy values survive into the destination (re-emitted as canonical).
Mirrors the existing x-amz-meta-* backward-compat path.
* fix(s3): keep legacy non-canonical tag and system metadata across COPY
The previous case-insensitive isManagedCopyMetadataKey caused
mergeCopyMetadata to delete legacy lowercase x-amz-tagging-* and
mixed-case system headers, but the COPY branch in processMetadataBytes
only matched canonical or strict-lowercase keys when re-populating
them, so any non-canonical key was permanently dropped on COPY.
- COPY now scans existing in a single pass and uses strings.EqualFold
against the system header whitelist, re-emitting under the canonical
header name. Handles any case folding (CACHE-CONTROL, Cache-control,
etc.), not just strings.ToLower.
- COPY tagging branch now uses hasPrefixFold(k, AmzObjectTagging) and
re-emits the canonical X-Amz-Tagging-<suffix>, mirroring the existing
X-Amz-Meta-* migration path.
- Tests cover lowercase/uppercase/mixed-case system headers and tags
surviving COPY.
* fix(s3): make COPY of system metadata and tags deterministic across case variants
Single-pass EqualFold matching let Go's randomized map iteration pick
either the canonical or a legacy-cased value when both lived on the
source, so the COPY result varied between calls.
Both COPY branches now use two passes: a canonical-exact lookup first,
then a case-insensitive fallback that only writes when the canonical
slot is still empty. Mirrors the collision-check pattern used by the
X-Amz-Meta-* migration path.
Tests run the canonical-vs-legacy collision 32 times each to exercise
varied map orders.
* fix(s3): apply REPLACE Content-Type on in-place copy
The metadata-only self-copy path never set Attributes.Mime, so a same-key
CopyObject with REPLACE and a new Content-Type silently kept the old type.
Route in place only when the Mime is unchanged; otherwise take the locked
clone path (still metadata-only, reuses source chunks) and set the new Mime
there. Also covers the versioned self-copy path.
* perf(s3): drop per-key ToLower in isManagedCopyMetadataKey
Use the allocation-free hasPrefixFold helper instead of lowercasing the key
and both constant prefixes on every metadata-key check.
---------
Co-authored-by: Chris Lu <chris.lu@gmail.com>
see https://blog.aqwari.net/xml-schema-go/
1. go get aqwari.net/xml/cmd/xsdgen
2. Add EncodingType element for ListBucketResult in AmazonS3.xsd
3. xsdgen -o s3api_xsd_generated.go -pkg s3api AmazonS3.xsd
4. Remove empty Grantee struct in s3api_xsd_generated.go
5. Remove xmlns: sed s'/http:\/\/s3.amazonaws.com\/doc\/2006-03-01\/\ //' s3api_xsd_generated.go
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