versitygw/s3api/utils/utils_test.go

// Copyright 2023 Versity Software
// This file is licensed under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package utils

import (
	"bufio"
	"bytes"
	"encoding/xml"
	"errors"
	"math/rand"
	"net/http"
	"net/url"
	"reflect"
	"strings"
	"testing"
	"time"

	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/gofiber/fiber/v2"
	"github.com/stretchr/testify/assert"
	"github.com/valyala/fasthttp"
	"github.com/versity/versitygw/backend"
	"github.com/versity/versitygw/s3err"
	"github.com/versity/versitygw/s3response"
)

func TestCreateHttpRequestFromCtx(t *testing.T) {
	type args struct {
		ctx *fiber.Ctx
	}

	app := fiber.New()

	// Expected output, Case 1
	ctx := app.AcquireCtx(&fasthttp.RequestCtx{})
	req := ctx.Request()
	request, _ := http.NewRequest(string(req.Header.Method()), req.URI().String(), bytes.NewReader(req.Body()))

	// Case 2
	ctx2 := app.AcquireCtx(&fasthttp.RequestCtx{})
	req2 := ctx2.Request()
	req2.Header.Add("X-Amz-Mfa", "Some valid Mfa")

	request2, _ := http.NewRequest(string(req2.Header.Method()), req2.URI().String(), bytes.NewReader(req2.Body()))
	request2.Header.Add("X-Amz-Mfa", "Some valid Mfa")

	tests := []struct {
		name    string
		args    args
		want    *http.Request
		wantErr bool
		hdrs    []string
	}{
		{
			name: "Success-response",
			args: args{
				ctx: ctx,
			},
			want:    request,
			wantErr: false,
			hdrs:    []string{},
		},
		{
			name: "Success-response-With-Headers",
			args: args{
				ctx: ctx2,
			},
			want:    request2,
			wantErr: false,
			hdrs:    []string{"X-Amz-Mfa"},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := createHttpRequestFromCtx(tt.args.ctx, tt.hdrs, 0)
			if (err != nil) != tt.wantErr {
				t.Errorf("CreateHttpRequestFromCtx() error = %v, wantErr %v", err, tt.wantErr)
				return
			}

			if !reflect.DeepEqual(got.Header, tt.want.Header) {
				t.Errorf("CreateHttpRequestFromCtx() got = %v, want %v", got, tt.want)
			}
		})
	}
}

// a helper method to construct a raw http request with the given http request headers
// to further parse with fasthttp.Request.Read and return fasthttp.RequestHeader
func createHeadersFromRawRequest(t *testing.T, hdrs [][2]string) *fasthttp.RequestHeader {
	t.Helper()

	var b strings.Builder
	b.WriteString("PUT / HTTP/1.1\r\n")
	b.WriteString("Host: example.com\r\n")
	for _, kv := range hdrs {
		b.WriteString(kv[0])
		b.WriteString(": ")
		b.WriteString(kv[1])
		b.WriteString("\r\n")
	}
	b.WriteString("\r\n")

	var req fasthttp.Request
	if err := req.Read(bufio.NewReader(bytes.NewReader([]byte(b.String())))); err != nil {
		t.Fatalf("failed to parse raw request: %v", err)
	}
	return &req.Header
}

func TestGetUserMetaData(t *testing.T) {
	tests := []struct {
		name    string
		hdrs    [][2]string
		want    map[string]string
		wantErr error
	}{
		{
			name: "no metadata headers",
			hdrs: [][2]string{
				{"Content-Type", "application/json"},
			},
			want: map[string]string{},
		},
		{
			name: "single metadata header",
			hdrs: [][2]string{
				{"x-amz-meta-foo", "bar"},
			},
			want: map[string]string{"foo": "bar"},
		},
		{
			name: "multiple metadata headers",
			hdrs: [][2]string{
				{"x-amz-meta-foo", "bar"},
				{"x-amz-meta-baz", "qux"},
			},
			want: map[string]string{"foo": "bar", "baz": "qux"},
		},
		{
			name: "case-insensitive prefix and key lowercasing",
			hdrs: [][2]string{
				{"X-Amz-Meta-TestKey", "Value"},
			},
			want: map[string]string{"testkey": "Value"},
		},
		{
			name: "ignores non-metadata headers",
			hdrs: [][2]string{
				{"authorization", "token"},
				{"x-amz-meta-foo", "bar"},
			},
			want: map[string]string{"foo": "bar"},
		},
		{
			name: "metadata size exceeds limit (single header)",
			hdrs: [][2]string{
				{"x-amz-meta-big", strings.Repeat("a", maxMetadataSize+1)},
			},
			wantErr: s3err.GetMetadataTooLargeErr(2052, maxMetadataSize),
		},
		{
			name: "metadata cumulative size exceeds limit (multiple headers)",
			hdrs: [][2]string{
				{"x-amz-meta-a", strings.Repeat("a", maxMetadataSize/2)},
				{"x-amz-meta-b", strings.Repeat("b", maxMetadataSize/2+10)},
			},
			wantErr: s3err.GetMetadataTooLargeErr(2060, maxMetadataSize),
		},
		{
			name: "duplicate keys combined",
			hdrs: [][2]string{
				{"x-amz-meta-Foo", "first"},
				{"x-amz-meta-foo", "second"},
			},
			want: map[string]string{"foo": "first,second"},
		},
		{
			name: "duplicate same value keys combined",
			hdrs: [][2]string{
				{"x-amz-meta-Foo", "value"},
				{"x-amz-meta-foo", "value"},
			},
			want: map[string]string{"foo": "value,value"},
		},
		{
			name: "mixed keys",
			hdrs: [][2]string{
				{"x-amz-meta-Foo", "value2"},
				{"x-amz-meta-fOo", "value1"},
				{"x-amz-meta-foO", "value3"},
				{"x-amz-meta-bar", "baz"},
				{"x-amz-meta-quxx", "efg"},
				{"x-amz-meta-abc", "value"},
				{"x-amz-meta-Abc", "value"},
				{"x-amz-meta-aBc", "value"},
				{"x-amz-meta-abC", "value"},
				{"x-amz-meta-ABC", "value"},
			},
			want: map[string]string{
				"foo":  "value2,value1,value3",
				"bar":  "baz",
				"quxx": "efg",
				"abc":  "value,value,value,value,value",
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			h := createHeadersFromRawRequest(t, tt.hdrs)

			got, err := GetUserMetaData(h)
			assert.Equal(t, tt.wantErr, err)
			assert.Equal(t, tt.want, got)
		})
	}
}

func Test_includeHeader(t *testing.T) {
	type args struct {
		hdr        string
		signedHdrs []string
	}
	tests := []struct {
		name string
		args args
		want bool
	}{
		{
			name: "include-header-falsy-case",
			args: args{
				hdr:        "Content-Type",
				signedHdrs: []string{"X-Amz-Acl", "Content-Encoding"},
			},
			want: false,
		},
		{
			name: "include-header-falsy-case",
			args: args{
				hdr:        "Content-Type",
				signedHdrs: []string{"X-Amz-Acl", "Content-Type"},
			},
			want: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := includeHeader(tt.args.hdr, tt.args.signedHdrs); got != tt.want {
				t.Errorf("includeHeader() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestIsValidBucketName(t *testing.T) {
	type args struct {
		bucket string
	}
	tests := []struct {
		name string
		args args
		want bool
	}{
		{
			name: "IsValidBucketName-short-name",
			args: args{
				bucket: "a",
			},
			want: false,
		},
		{
			name: "IsValidBucketName-start-with-hyphen",
			args: args{
				bucket: "-bucket",
			},
			want: false,
		},
		{
			name: "IsValidBucketName-start-with-dot",
			args: args{
				bucket: ".bucket",
			},
			want: false,
		},
		{
			name: "IsValidBucketName-contain-invalid-character",
			args: args{
				bucket: "my@bucket",
			},
			want: false,
		},
		{
			name: "IsValidBucketName-end-with-hyphen",
			args: args{
				bucket: "bucket-",
			},
			want: false,
		},
		{
			name: "IsValidBucketName-end-with-dot",
			args: args{
				bucket: "bucket.",
			},
			want: false,
		},
		{
			name: "IsValidBucketName-valid-bucket-name",
			args: args{
				bucket: "my-bucket",
			},
			want: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := IsValidBucketName(tt.args.bucket); got != tt.want {
				t.Errorf("IsValidBucketName() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestSetBucketNameValidationStrict(t *testing.T) {
	SetBucketNameValidationStrict(true)
	t.Cleanup(func() {
		SetBucketNameValidationStrict(true)
	})

	invalidBucket := "Invalid_Bucket"
	if IsValidBucketName(invalidBucket) {
		t.Fatalf("expected %q to be invalid with strict validation", invalidBucket)
	}

	SetBucketNameValidationStrict(false)
	if !IsValidBucketName(invalidBucket) {
		t.Fatalf("expected %q to be accepted when strict validation disabled", invalidBucket)
	}

	SetBucketNameValidationStrict(true)
	if IsValidBucketName(invalidBucket) {
		t.Fatalf("expected %q to be invalid after re-enabling strict validation", invalidBucket)
	}
}

func TestParseMaxLimiter(t *testing.T) {
	type args struct {
		str string
		lt  LimiterType
	}
	type expected struct {
		err error
		res int32
	}
	tests := []struct {
		name     string
		args     args
		expected expected
	}{
		{
			name: "empty_string",
			args: args{
				str: "",
				lt:  LimiterTypeMaxKeys,
			},
			expected: expected{
				err: nil,
				res: 1000,
			},
		},
		{
			name: "empty_max-buckets",
			args: args{
				str: "",
				lt:  LimiterTypeMaxBuckets,
			},
			expected: expected{
				err: nil,
				res: 10000,
			},
		},
		{
			name: "invalid_max-parts",
			args: args{
				str: "bla",
				lt:  LimiterTypeMaxParts,
			},
			expected: expected{
				err: s3err.GetInvalidArgMaxLimiter(string(LimiterTypeMaxParts), "bla"),
				res: 0,
			},
		},
		{
			name: "invalid_max-uploads",
			args: args{
				str: "invalid",
				lt:  LimiterTypeMaxUploads,
			},
			expected: expected{
				err: s3err.GetInvalidArgMaxLimiter(string(LimiterTypeMaxUploads), "invalid"),
				res: 0,
			},
		},
		{
			name: "invalid_max-buckets",
			args: args{
				str: "invalid",
				lt:  LimiterTypeMaxBuckets,
			},
			expected: expected{
				err: s3err.GetInvalidArgMaxLimiter(string(LimiterTypeMaxBuckets), "invalid"),
				res: 0,
			},
		},
		{
			name: "invalid_versions_max-keys",
			args: args{
				str: "invalid",
				lt:  LimiterTypeMaxKeys,
			},
			expected: expected{
				err: s3err.GetInvalidArgMaxLimiter(string(LimiterTypeMaxKeys), "invalid"),
				res: 0,
			},
		},
		{
			name: "negative_max-keys",
			args: args{
				str: "-5",
				lt:  LimiterTypeMaxKeys,
			},
			expected: expected{
				err: s3err.GetInvalidArgNegativeMaxLimiter(string(LimiterTypeMaxKeys), "-5"),
				res: 0,
			},
		},
		{
			name: "negative_part-number-marker",
			args: args{
				str: "-5",
				lt:  LimiterTypePartNumberMarker,
			},
			expected: expected{
				err: s3err.GetInvalidArgNegativeMaxLimiter(string(LimiterTypePartNumberMarker), "-5"),
				res: 0,
			},
		},
		{
			name: "negative_max-buckets",
			args: args{
				str: "-12",
				lt:  LimiterTypeMaxBuckets,
			},
			expected: expected{
				err: s3err.GetInvalidArgumentErr(s3err.InvalidArgMaxBuckets, "-12"),
				res: 0,
			},
		},
		{
			name: "negative_versions_max-keys",
			args: args{
				str: "-12",
				lt:  LimiterTypeVersionsMaxKeys,
			},
			expected: expected{
				err: s3err.GetInvalidArgumentErr(s3err.InvalidArgNegativeMaxKeys, "-12"),
				res: 0,
			},
		},
		{
			name: "greater_than_10000_max-buckets",
			args: args{
				str: "25000",
				lt:  LimiterTypeMaxBuckets,
			},
			expected: expected{
				err: s3err.GetInvalidArgumentErr(s3err.InvalidArgMaxBuckets, "25000"),
				res: 0,
			},
		},
		{
			name: "greater_than_1000_max-buckets",
			args: args{
				str: "1300",
				lt:  LimiterTypeMaxBuckets,
			},
			expected: expected{
				err: nil,
				res: 1300,
			},
		},
		{
			name: "greater_than_1000",
			args: args{
				str: "25000",
				lt:  LimiterTypeMaxParts,
			},
			expected: expected{
				err: nil,
				res: 1000,
			},
		},
		{
			name: "success",
			args: args{
				str: "23",
				lt:  LimiterTypeMaxUploads,
			},
			expected: expected{
				err: nil,
				res: 23,
			},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := ParseMaxLimiter(tt.args.str, tt.args.lt)
			assert.Equal(t, tt.expected.err, err)
			assert.Equal(t, tt.expected.res, got)
		})
	}
}

func TestFilterObjectAttributes(t *testing.T) {
	type args struct {
		attrs  map[s3response.ObjectAttributes]struct{}
		output s3response.GetObjectAttributesResponse
	}

	etag, objSize := "etag", int64(3222)
	delMarker := true

	tests := []struct {
		name string
		args args
		want s3response.GetObjectAttributesResponse
	}{
		{
			name: "keep only ETag",
			args: args{
				attrs: map[s3response.ObjectAttributes]struct{}{
					s3response.ObjectAttributesEtag: {},
				},
				output: s3response.GetObjectAttributesResponse{
					ObjectSize: &objSize,
					ETag:       &etag,
				},
			},
			want: s3response.GetObjectAttributesResponse{ETag: &etag},
		},
		{
			name: "keep multiple props",
			args: args{
				attrs: map[s3response.ObjectAttributes]struct{}{
					s3response.ObjectAttributesEtag:         {},
					s3response.ObjectAttributesObjectSize:   {},
					s3response.ObjectAttributesStorageClass: {},
				},
				output: s3response.GetObjectAttributesResponse{
					ObjectSize:  &objSize,
					ETag:        &etag,
					ObjectParts: &s3response.ObjectParts{},
					VersionId:   &etag,
				},
			},
			want: s3response.GetObjectAttributesResponse{
				ETag:       &etag,
				ObjectSize: &objSize,
			},
		},
		{
			name: "make sure LastModified, DeleteMarker and VersionId are removed",
			args: args{
				attrs: map[s3response.ObjectAttributes]struct{}{
					s3response.ObjectAttributesEtag: {},
				},
				output: s3response.GetObjectAttributesResponse{
					ObjectSize:   &objSize,
					ETag:         &etag,
					ObjectParts:  &s3response.ObjectParts{},
					VersionId:    &etag,
					LastModified: backend.GetTimePtr(time.Now()),
					DeleteMarker: &delMarker,
				},
			},
			want: s3response.GetObjectAttributesResponse{
				ETag: &etag,
			},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := FilterObjectAttributes(tt.args.attrs, tt.args.output); !reflect.DeepEqual(got, tt.want) {
				t.Errorf("FilterObjectAttributes() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestIsValidOwnership(t *testing.T) {
	type args struct {
		val types.ObjectOwnership
	}
	tests := []struct {
		name string
		args args
		want bool
	}{
		{
			name: "valid-BucketOwnerEnforced",
			args: args{
				val: types.ObjectOwnershipBucketOwnerEnforced,
			},
			want: true,
		},
		{
			name: "valid-BucketOwnerPreferred",
			args: args{
				val: types.ObjectOwnershipBucketOwnerPreferred,
			},
			want: true,
		},
		{
			name: "valid-ObjectWriter",
			args: args{
				val: types.ObjectOwnershipObjectWriter,
			},
			want: true,
		},
		{
			name: "invalid_value",
			args: args{
				val: types.ObjectOwnership("invalid_value"),
			},
			want: false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := IsValidOwnership(tt.args.val); got != tt.want {
				t.Errorf("IsValidOwnership() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestIsChecksumAlgorithmValid(t *testing.T) {
	type args struct {
		alg types.ChecksumAlgorithm
	}
	tests := []struct {
		name    string
		args    args
		wantErr bool
	}{
		{
			name: "empty",
			args: args{
				alg: "",
			},
			wantErr: false,
		},
		{
			name: "crc32",
			args: args{
				alg: types.ChecksumAlgorithmCrc32,
			},
			wantErr: false,
		},
		{
			name: "crc32c",
			args: args{
				alg: types.ChecksumAlgorithmCrc32c,
			},
			wantErr: false,
		},
		{
			name: "sha1",
			args: args{
				alg: types.ChecksumAlgorithmSha1,
			},
			wantErr: false,
		},
		{
			name: "sha256",
			args: args{
				alg: types.ChecksumAlgorithmSha256,
			},
			wantErr: false,
		},
		{
			name: "crc64nvme",
			args: args{
				alg: types.ChecksumAlgorithmCrc64nvme,
			},
			wantErr: false,
		},
		{
			name: "sha512",
			args: args{
				alg: types.ChecksumAlgorithmSha512,
			},
			wantErr: false,
		},
		{
			name: "md5",
			args: args{
				alg: types.ChecksumAlgorithmMd5,
			},
			wantErr: false,
		},
		{
			name: "xxhash64",
			args: args{
				alg: types.ChecksumAlgorithmXxhash64,
			},
			wantErr: false,
		},
		{
			name: "xxhash3",
			args: args{
				alg: types.ChecksumAlgorithmXxhash3,
			},
			wantErr: false,
		},
		{
			name: "xxhash128",
			args: args{
				alg: types.ChecksumAlgorithmXxhash128,
			},
			wantErr: false,
		},
		{
			name: "invalid",
			args: args{
				alg: types.ChecksumAlgorithm("invalid_checksum_algorithm"),
			},
			wantErr: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if err := IsChecksumAlgorithmValid(tt.args.alg); (err != nil) != tt.wantErr {
				t.Errorf("IsChecksumAlgorithmValid() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}

func TestIsValidChecksum(t *testing.T) {
	type args struct {
		checksum  string
		algorithm types.ChecksumAlgorithm
	}
	tests := []struct {
		name string
		args args
		want bool
	}{
		{
			name: "invalid-base64",
			args: args{
				checksum:  "invalid_base64_string",
				algorithm: types.ChecksumAlgorithmCrc32,
			},
			want: false,
		},
		{
			name: "invalid-crc32",
			args: args{
				checksum:  "YXNkZmFzZGZhc2Rm",
				algorithm: types.ChecksumAlgorithmCrc32,
			},
			want: false,
		},
		{
			name: "valid-crc32",
			args: args{
				checksum:  "ww2FVQ==",
				algorithm: types.ChecksumAlgorithmCrc32,
			},
			want: true,
		},
		{
			name: "invalid-crc32c",
			args: args{
				checksum:  "Zmdoa2doZmtnZmhr",
				algorithm: types.ChecksumAlgorithmCrc32c,
			},
			want: false,
		},
		{
			name: "valid-crc32c",
			args: args{
				checksum:  "DOsb4w==",
				algorithm: types.ChecksumAlgorithmCrc32c,
			},
			want: true,
		},
		{
			name: "invalid-sha1",
			args: args{
				checksum:  "YXNkZmFzZGZhc2RmYXNkZnNhZGZzYWRm",
				algorithm: types.ChecksumAlgorithmSha1,
			},
			want: false,
		},
		{
			name: "valid-sha1",
			args: args{
				checksum:  "L4q6V59Zcwn12wyLIytoE2c1ugk=",
				algorithm: types.ChecksumAlgorithmSha1,
			},
			want: true,
		},
		{
			name: "invalid-sha256",
			args: args{
				checksum:  "Zmdoa2doZmtnZmhrYXNkZmFzZGZhc2RmZHNmYXNkZg==",
				algorithm: types.ChecksumAlgorithmSha256,
			},
			want: false,
		},
		{
			name: "valid-sha256",
			args: args{
				checksum:  "d1SPCd/kZ2rAzbbLUC0n/bEaOSx70FNbXbIqoIxKuPY=",
				algorithm: types.ChecksumAlgorithmSha256,
			},
			want: true,
		},
		{
			name: "invalid-crc64nvme",
			args: args{
				checksum:  "ww2FVQ==",
				algorithm: types.ChecksumAlgorithmCrc64nvme,
			},
			want: false,
		},
		{
			name: "valid-crc64nvme",
			args: args{
				checksum:  "AAAAAAAAAAA=",
				algorithm: types.ChecksumAlgorithmCrc64nvme,
			},
			want: true,
		},
		{
			name: "invalid-sha512",
			args: args{
				checksum:  "d1SPCd/kZ2rAzbbLUC0n/bEaOSx70FNbXbIqoIxKuPY=",
				algorithm: types.ChecksumAlgorithmSha512,
			},
			want: false,
		},
		{
			name: "valid-sha512",
			args: args{
				checksum:  "z4PhNX7vuL3xVChQ1m2AB9Yg5AULVxXcg/SpIdNs6c5H0NE8XYXysP+DGNKHfuwvY7kxvUdBeoGlODJ6+SfaPg==",
				algorithm: types.ChecksumAlgorithmSha512,
			},
			want: true,
		},
		{
			name: "invalid-md5",
			args: args{
				checksum:  "L4q6V59Zcwn12wyLIytoE2c1ugk=",
				algorithm: types.ChecksumAlgorithmMd5,
			},
			want: false,
		},
		{
			name: "valid-md5",
			args: args{
				checksum:  "1B2M2Y8AsgTpgAmY7PhCfg==",
				algorithm: types.ChecksumAlgorithmMd5,
			},
			want: true,
		},
		{
			name: "invalid-xxhash64",
			args: args{
				checksum:  "1B2M2Y8AsgTpgAmY7PhCfg==",
				algorithm: types.ChecksumAlgorithmXxhash64,
			},
			want: false,
		},
		{
			name: "valid-xxhash64",
			args: args{
				checksum:  "70bbN1HY6Zk=",
				algorithm: types.ChecksumAlgorithmXxhash64,
			},
			want: true,
		},
		{
			name: "invalid-xxhash3",
			args: args{
				checksum:  "L4q6V59Zcwn12wyLIytoE2c1ugk=",
				algorithm: types.ChecksumAlgorithmXxhash3,
			},
			want: false,
		},
		{
			name: "valid-xxhash3",
			args: args{
				checksum:  "LQaABTjTlMI=",
				algorithm: types.ChecksumAlgorithmXxhash3,
			},
			want: true,
		},
		{
			name: "invalid-xxhash128",
			args: args{
				checksum:  "70bbN1HY6Zk=",
				algorithm: types.ChecksumAlgorithmXxhash128,
			},
			want: false,
		},
		{
			name: "valid-xxhash128",
			args: args{
				checksum:  "maoG0wFHmNhgAcMkRo1Jfw==",
				algorithm: types.ChecksumAlgorithmXxhash128,
			},
			want: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := IsValidChecksum(tt.args.checksum, tt.args.algorithm); got != tt.want {
				t.Errorf("IsValidChecksum() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestExtractMetadataFromFields(t *testing.T) {
	tests := []struct {
		name    string
		fields  map[string]string
		want    map[string]string
		wantErr error
	}{
		{
			name: "extracts metadata only",
			fields: map[string]string{
				"x-amz-meta-owner": "alice",
				"x-amz-meta-env":   "prod",
				"key":              "uploads/report.pdf",
			},
			want: map[string]string{
				"owner": "alice",
				"env":   "prod",
			},
		},
		{
			name: "returns empty map when no metadata fields exist",
			fields: map[string]string{
				"key":  "uploads/report.pdf",
				"acl":  "private",
				"file": "ignored",
			},
			want: map[string]string{},
		},
		{
			name: "allows empty metadata value",
			fields: map[string]string{
				"x-amz-meta-owner": "",
			},
			want: map[string]string{
				"owner": "",
			},
		},
		{
			name: "metadata too large",
			fields: map[string]string{
				"x-amz-meta-big": strings.Repeat("a", maxMetadataSize-len("big")+1),
			},
			wantErr: s3err.GetMetadataTooLargeErr(2049, maxMetadataSize),
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := ExtractMetadataFromFields(tt.fields)
			if !errors.Is(err, tt.wantErr) {
				t.Fatalf("expected error %v, got %v", tt.wantErr, err)
			}
			if err != nil {
				return
			}
			if !reflect.DeepEqual(got, tt.want) {
				t.Fatalf("unexpected metadata: got %v want %v", got, tt.want)
			}
		})
	}
}

func TestParseCalculatedChecksumFields(t *testing.T) {
	tests := []struct {
		name    string
		fields  map[string]string
		want    ChecksumValues
		wantErr error
	}{
		{
			name: "empty fields",
			fields: map[string]string{
				"key": "uploads/file.txt",
			},
			want: ChecksumValues{},
		},
		{
			name: "single valid checksum field",
			fields: map[string]string{
				"x-amz-checksum-crc32": "ww2FVQ==",
			},
			want: ChecksumValues{
				types.ChecksumAlgorithmCrc32: "ww2FVQ==",
			},
		},
		{
			name: "ignores algorithm and type helper fields",
			fields: map[string]string{
				"x-amz-checksum-algorithm": "CRC32",
				"x-amz-checksum-type":      "FULL_OBJECT",
				"x-amz-checksum-crc32":     "ww2FVQ==",
			},
			want: ChecksumValues{
				types.ChecksumAlgorithmCrc32: "ww2FVQ==",
			},
		},
		{
			name: "invalid checksum field name",
			fields: map[string]string{
				"x-amz-checksum-madeup": "abc",
			},
			wantErr: s3err.GetAPIError(s3err.ErrInvalidChecksumHeader),
		},
		{
			name: "multiple checksum fields",
			fields: map[string]string{
				"x-amz-checksum-crc32":  "ww2FVQ==",
				"x-amz-checksum-sha256": "d1SPCd/kZ2rAzbbLUC0n/bEaOSx70FNbXbIqoIxKuPY=",
			},
			wantErr: s3err.GetAPIError(s3err.ErrMultipleChecksumHeaders),
		},
		{
			name: "invalid checksum value",
			fields: map[string]string{
				"x-amz-checksum-crc32": "invalid_base64_string",
			},
			wantErr: s3err.GetInvalidChecksumHeaderErr("x-amz-checksum-crc32"),
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := ParseCalculatedChecksumFields(tt.fields)
			if !errors.Is(err, tt.wantErr) {
				t.Fatalf("expected error %v, got %v", tt.wantErr, err)
			}
			if err != nil {
				return
			}
			if !reflect.DeepEqual(got, tt.want) {
				t.Fatalf("unexpected checksums: got %v want %v", got, tt.want)
			}
		})
	}
}

func TestIsChecksumTypeValid(t *testing.T) {
	type args struct {
		t types.ChecksumType
	}
	tests := []struct {
		name    string
		args    args
		wantErr bool
	}{
		{
			name: "valid_FULL_OBJECT",
			args: args{
				t: types.ChecksumTypeFullObject,
			},
			wantErr: false,
		},
		{
			name: "valid_COMPOSITE",
			args: args{
				t: types.ChecksumTypeComposite,
			},
			wantErr: false,
		},
		{
			name: "invalid",
			args: args{
				t: types.ChecksumType("invalid_checksum_type"),
			},
			wantErr: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if err := IsChecksumTypeValid(tt.args.t); (err != nil) != tt.wantErr {
				t.Errorf("IsChecksumTypeValid() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}

func Test_checkChecksumTypeAndAlgo(t *testing.T) {
	type args struct {
		algo types.ChecksumAlgorithm
		t    types.ChecksumType
	}
	tests := []struct {
		name    string
		args    args
		wantErr bool
	}{
		{
			name: "full_object-crc32",
			args: args{
				algo: types.ChecksumAlgorithmCrc32,
				t:    types.ChecksumTypeFullObject,
			},
			wantErr: false,
		},
		{
			name: "full_object-crc32c",
			args: args{
				algo: types.ChecksumAlgorithmCrc32c,
				t:    types.ChecksumTypeFullObject,
			},
			wantErr: false,
		},
		{
			name: "full_object-sha1",
			args: args{
				algo: types.ChecksumAlgorithmSha1,
				t:    types.ChecksumTypeFullObject,
			},
			wantErr: true,
		},
		{
			name: "full_object-sha256",
			args: args{
				algo: types.ChecksumAlgorithmSha1,
				t:    types.ChecksumTypeFullObject,
			},
			wantErr: true,
		},
		{
			name: "full_object-crc64nvme",
			args: args{
				algo: types.ChecksumAlgorithmCrc64nvme,
				t:    types.ChecksumTypeFullObject,
			},
			wantErr: false,
		},
		{
			name: "full_object-crc32",
			args: args{
				algo: types.ChecksumAlgorithmCrc32,
				t:    types.ChecksumTypeFullObject,
			},
			wantErr: false,
		},
		{
			name: "composite-crc32",
			args: args{
				algo: types.ChecksumAlgorithmCrc32,
				t:    types.ChecksumTypeComposite,
			},
			wantErr: false,
		},
		{
			name: "composite-crc32c",
			args: args{
				algo: types.ChecksumAlgorithmCrc32c,
				t:    types.ChecksumTypeComposite,
			},
			wantErr: false,
		},
		{
			name: "composite-sha1",
			args: args{
				algo: types.ChecksumAlgorithmSha1,
				t:    types.ChecksumTypeComposite,
			},
			wantErr: false,
		},
		{
			name: "composite-sha256",
			args: args{
				algo: types.ChecksumAlgorithmSha256,
				t:    types.ChecksumTypeComposite,
			},
			wantErr: false,
		},
		{
			name: "composite-crc64nvme",
			args: args{
				algo: types.ChecksumAlgorithmCrc64nvme,
				t:    types.ChecksumTypeComposite,
			},
			wantErr: true,
		},
		{
			name: "full_object-sha512",
			args: args{
				algo: types.ChecksumAlgorithmSha512,
				t:    types.ChecksumTypeFullObject,
			},
			wantErr: true,
		},
		{
			name: "full_object-md5",
			args: args{
				algo: types.ChecksumAlgorithmMd5,
				t:    types.ChecksumTypeFullObject,
			},
			wantErr: true,
		},
		{
			name: "full_object-xxhash64",
			args: args{
				algo: types.ChecksumAlgorithmXxhash64,
				t:    types.ChecksumTypeFullObject,
			},
			wantErr: true,
		},
		{
			name: "full_object-xxhash3",
			args: args{
				algo: types.ChecksumAlgorithmXxhash3,
				t:    types.ChecksumTypeFullObject,
			},
			wantErr: true,
		},
		{
			name: "full_object-xxhash128",
			args: args{
				algo: types.ChecksumAlgorithmXxhash128,
				t:    types.ChecksumTypeFullObject,
			},
			wantErr: true,
		},
		{
			name: "composite-sha512",
			args: args{
				algo: types.ChecksumAlgorithmSha512,
				t:    types.ChecksumTypeComposite,
			},
			wantErr: false,
		},
		{
			name: "composite-md5",
			args: args{
				algo: types.ChecksumAlgorithmMd5,
				t:    types.ChecksumTypeComposite,
			},
			wantErr: false,
		},
		{
			name: "composite-xxhash64",
			args: args{
				algo: types.ChecksumAlgorithmXxhash64,
				t:    types.ChecksumTypeComposite,
			},
			wantErr: false,
		},
		{
			name: "composite-xxhash3",
			args: args{
				algo: types.ChecksumAlgorithmXxhash3,
				t:    types.ChecksumTypeComposite,
			},
			wantErr: false,
		},
		{
			name: "composite-xxhash128",
			args: args{
				algo: types.ChecksumAlgorithmXxhash128,
				t:    types.ChecksumTypeComposite,
			},
			wantErr: false,
		},
		{
			name: "composite-empty",
			args: args{
				t: types.ChecksumTypeComposite,
			},
			wantErr: true,
		},
		{
			name: "full_object-empty",
			args: args{
				t: types.ChecksumTypeFullObject,
			},
			wantErr: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if err := checkChecksumTypeAndAlgo(tt.args.algo, tt.args.t); (err != nil) != tt.wantErr {
				t.Errorf("checkChecksumTypeAndAlgo() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}

func TestParseTagging(t *testing.T) {
	genRandStr := func(lgth int) string {
		b := make([]byte, lgth)
		for i := range b {
			b[i] = byte(rand.Intn(95) + 32) // 126 - 32 + 1 = 95 printable characters
		}
		return string(b)
	}
	getTagSet := func(lgth int) s3response.Tagging {
		res := s3response.Tagging{
			TagSet: s3response.TagSet{
				Tags: []s3response.Tag{},
			},
		}

		for range lgth {
			res.TagSet.Tags = append(res.TagSet.Tags, s3response.Tag{
				Key:   genRandStr(10),
				Value: genRandStr(20),
			})
		}

		return res
	}
	type args struct {
		data        s3response.Tagging
		overrideXML []byte
		limit       TagLimit
	}
	tests := []struct {
		name    string
		args    args
		want    map[string]string
		wantErr error
	}{
		{
			name: "valid tags within limit",
			args: args{
				data: s3response.Tagging{
					TagSet: s3response.TagSet{
						Tags: []s3response.Tag{
							{Key: "key1", Value: "value1"},
							{Key: "key2", Value: "value2"},
						},
					},
				},
				limit: TagLimitObject,
			},
			want:    map[string]string{"key1": "value1", "key2": "value2"},
			wantErr: nil,
		},
		{
			name: "malformed XML",
			args: args{
				overrideXML: []byte("invalid xml"),
				limit:       TagLimitObject,
			},
			want:    nil,
			wantErr: s3err.GetAPIError(s3err.ErrMalformedXML),
		},
		{
			name: "valid tags without namespace",
			args: args{
				overrideXML: []byte(`<?xml version="1.0"?><Tagging><TagSet><Tag><Key>key1</Key><Value>value1</Value></Tag><Tag><Key>key2</Key><Value>value2</Value></Tag></TagSet></Tagging>`),
				limit:       TagLimitObject,
			},
			want:    map[string]string{"key1": "value1", "key2": "value2"},
			wantErr: nil,
		},
		{
			name: "valid tags with namespace",
			args: args{
				overrideXML: []byte(`<?xml version="1.0"?><Tagging xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><TagSet><Tag><Key>key1</Key><Value>value1</Value></Tag><Tag><Key>key2</Key><Value>value2</Value></Tag></TagSet></Tagging>`),
				limit:       TagLimitObject,
			},
			want:    map[string]string{"key1": "value1", "key2": "value2"},
			wantErr: nil,
		},
		{
			name: "exceeds bucket tag limit",
			args: args{
				data:  getTagSet(51),
				limit: TagLimitBucket,
			},
			want:    nil,
			wantErr: s3err.GetAPIError(s3err.ErrBucketTaggingLimited),
		},
		{
			name: "exceeds object tag limit",
			args: args{
				data:  getTagSet(11),
				limit: TagLimitObject,
			},
			want:    nil,
			wantErr: s3err.GetAPIError(s3err.ErrObjectTaggingLimited),
		},
		{
			name: "invalid 0 length tag key",
			args: args{
				data: s3response.Tagging{
					TagSet: s3response.TagSet{
						Tags: []s3response.Tag{{Key: "", Value: "value1"}},
					},
				},
				limit: TagLimitObject,
			},
			want:    nil,
			wantErr: s3err.GetAPIError(s3err.ErrInvalidTagKey),
		},
		{
			name: "invalid long tag key",
			args: args{
				data: s3response.Tagging{
					TagSet: s3response.TagSet{
						Tags: []s3response.Tag{{Key: genRandStr(130), Value: "value1"}},
					},
				},
				limit: TagLimitObject,
			},
			want:    nil,
			wantErr: s3err.GetAPIError(s3err.ErrInvalidTagKey),
		},
		{
			name: "invalid long tag value",
			args: args{
				data: s3response.Tagging{
					TagSet: s3response.TagSet{
						Tags: []s3response.Tag{{Key: "key", Value: genRandStr(257)}},
					},
				},
				limit: TagLimitBucket,
			},
			want:    nil,
			wantErr: s3err.GetAPIError(s3err.ErrInvalidTagValue),
		},
		{
			name: "duplicate tag key",
			args: args{
				data: s3response.Tagging{
					TagSet: s3response.TagSet{
						Tags: []s3response.Tag{
							{Key: "key", Value: "value1"},
							{Key: "key", Value: "value2"},
						},
					},
				},
				limit: TagLimitObject,
			},
			want:    nil,
			wantErr: s3err.GetAPIError(s3err.ErrDuplicateTagKey),
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			var data []byte
			if tt.args.overrideXML != nil {
				data = tt.args.overrideXML
			} else {
				var err error
				data, err = xml.Marshal(tt.args.data)
				if err != nil {
					t.Fatalf("error marshalling input: %v", err)
				}
			}
			got, err := ParseTagging(data, tt.args.limit)

			if !errors.Is(err, tt.wantErr) {
				t.Errorf("expected error %v, got %v", tt.wantErr, err)
			}
			if err == nil && !reflect.DeepEqual(got, tt.want) {
				t.Errorf("expected result %v, got %v", tt.want, got)
			}
		})
	}
}

func TestConvertTaggingXMLToQueryString(t *testing.T) {
	tests := []struct {
		name    string
		data    s3response.Tagging
		rawXML  []byte
		want    string
		wantErr error
	}{
		{
			name: "success",
			data: s3response.Tagging{
				TagSet: s3response.TagSet{
					Tags: []s3response.Tag{
						{Key: "project", Value: "versity gw"},
						{Key: "team", Value: "storage"},
					},
				},
			},
			want: "project=versity+gw&team=storage",
		},
		{
			name:    "parse error",
			rawXML:  []byte("not xml"),
			wantErr: s3err.GetAPIError(s3err.ErrMalformedXML),
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			var data []byte
			if tt.rawXML != nil {
				data = tt.rawXML
			} else {
				var err error
				data, err = xml.Marshal(tt.data)
				if err != nil {
					t.Fatalf("error marshalling input: %v", err)
				}
			}

			got, err := ConvertTaggingXMLToQueryString(data)
			if !errors.Is(err, tt.wantErr) {
				t.Fatalf("expected error %v, got %v", tt.wantErr, err)
			}
			if err != nil {
				return
			}

			if got != tt.want {
				t.Fatalf("unexpected tagging string: got %q want %q", got, tt.want)
			}

			values, err := url.ParseQuery(got)
			if err != nil {
				t.Fatalf("parse query: %v", err)
			}
			for _, tag := range tt.data.TagSet.Tags {
				if values.Get(tag.Key) != tag.Value {
					t.Fatalf("unexpected query value for %q: got %q want %q", tag.Key, values.Get(tag.Key), tag.Value)
				}
			}
		})
	}
}

func TestValidateCopySource(t *testing.T) {
	tests := []struct {
		name       string
		copysource string
		err        error
	}{
		// invalid encoding
		{"invalid encoding 1", "%", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%")},
		{"invalid encoding 2", "%2", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%2")},
		{"invalid encoding 3", "%G1", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%G1")},
		{"invalid encoding 4", "%1Z", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%1Z")},
		{"invalid encoding 5", "%0H", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%0H")},
		{"invalid encoding 6", "%XY", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%XY")},
		{"invalid encoding 7", "%E", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%E")},
		{"invalid encoding 8", "hello%", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "hello%")},
		{"invalid encoding 9", "%%", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%%")},
		{"invalid encoding 10", "%2Gmore", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%2Gmore")},
		{"invalid encoding 11", "100%%sure", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "100%%sure")},
		{"invalid encoding 12", "%#00", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%#00")},
		{"invalid encoding 13", "%0%0", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%0%0")},
		{"invalid encoding 14", "%?versionId=id", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceEncoding, "%?versionId=id")},
		// invalid bucket name
		{"invalid bucket name 1", "168.200.1.255/obj/foo", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceBucket, "168.200.1.255/obj/foo")},
		{"invalid bucket name 2", "/0000:0db8:85a3:0000:0000:8a2e:0370:7224/smth", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceBucket, "/0000:0db8:85a3:0000:0000:8a2e:0370:7224/smth")},
		{"invalid bucket name 3", "", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceBucket, "")},
		{"invalid bucket name 4", "//obj/foo", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceBucket, "//obj/foo")},
		{"invalid bucket name 5", "//obj/foo?versionId=id", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceBucket, "//obj/foo?versionId=id")},
		// invalid object name
		{"invalid object name 1", "bucket/../foo", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceObject, "../foo")},
		{"invalid object name 2", "bucket/", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceObject, "")},
		{"invalid object name 3", "bucket", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceObject, "")},
		{"invalid object name 4", "bucket/../foo/dir/../../../", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceObject, "../foo/dir/../../../")},
		{"invalid object name 5", "bucket/.?versionId=smth", s3err.GetInvalidArgumentErr(s3err.InvalidArgCopySourceObject, ".")},
		// success
		{"no error 1", "bucket/object", nil},
		{"no error 2", "bucket/object/key", nil},
		{"no error 3", "bucket/4*&(*&(89765))", nil},
		{"no error 4", "bucket/foo/../bar", nil},
		{"no error 5", "bucket/foo/bar/baz?versionId=01BX5ZZKBKACTAV9WEVGEMMVRZ", nil},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := ValidateCopySource(tt.copysource)
			assert.Equal(t, tt.err, err)
		})
	}
}