Fix S3 object tagging issue #7589

- Add X-Amz-Tagging header parsing in putToFiler function for PUT object operations
- Store tags with X-Amz-Tagging- prefix in entry.Extended metadata
- Add comprehensive test suite for S3 object tagging functionality
- Tests cover upload tagging, API operations, special characters, and edge cases

test/s3/tagging/Makefile

@@ -0,0 +1,23 @@
+# S3 Object Tagging Tests
+# Tests for GitHub issue #7589: S3 object Tags query comes back empty
+
+.PHONY: test
+
+# Run all tagging tests
+test:
+	go test -v ./...
+
+# Run specific test
+test-upload:
+	go test -v -run TestObjectTaggingOnUpload
+
+test-special-chars:
+	go test -v -run TestObjectTaggingOnUploadWithSpecialCharacters
+
+test-api:
+	go test -v -run TestPutObjectTaggingAPI
+
+# Test configuration (override these for different environments)
+S3_ENDPOINT ?= http://localhost:8333
+S3_ACCESS_KEY ?= some_access_key1
+S3_SECRET_KEY ?= some_secret_key1

test/s3/tagging/README.md

@@ -0,0 +1,53 @@
+# S3 Object Tagging Tests
+
+This directory contains tests for S3 object tagging functionality.
+
+## Issue Reference
+
+These tests were created to verify the fix for [GitHub Issue #7589](https://github.com/seaweedfs/seaweedfs/issues/7589):
+**S3 object Tags query comes back empty**
+
+## Problem Description
+
+When uploading an object with tags using the `X-Amz-Tagging` header, the tags were not being stored. 
+When querying the object tagging with `GetObjectTagging`, the response was empty.
+
+This was a regression between SeaweedFS 4.00 and 4.01.
+
+## Root Cause
+
+The `putToFiler` function in `s3api_object_handlers_put.go` was not parsing the `X-Amz-Tagging` header
+and storing the tags in the entry's Extended metadata. The code was only copying user metadata 
+(headers starting with `X-Amz-Meta-`) but not object tags.
+
+## Fix
+
+Added tag parsing logic to `putToFiler` that:
+1. Reads the `X-Amz-Tagging` header
+2. Parses it using `url.ParseQuery()` for proper URL decoding
+3. Stores each tag with the prefix `X-Amz-Tagging-` in the entry's Extended metadata
+
+## Running Tests
+
+```bash
+# Run all tagging tests
+cd test/s3/tagging
+make test
+
+# Run specific test
+make test-upload
+
+# Or using go test directly
+go test -v ./...
+```
+
+## Test Cases
+
+1. **TestObjectTaggingOnUpload** - Basic test for tags sent during object upload
+2. **TestObjectTaggingOnUploadWithSpecialCharacters** - Tests URL-encoded tag values
+3. **TestObjectTaggingOnUploadWithEmptyValue** - Tests tags with empty values
+4. **TestPutObjectTaggingAPI** - Tests the PutObjectTagging API separately
+5. **TestDeleteObjectTagging** - Tests tag deletion
+6. **TestTagsNotPreservedAfterObjectOverwrite** - Verifies AWS S3 behavior on overwrite
+7. **TestMaximumNumberOfTags** - Tests storing the maximum 10 tags
+8. **TestTagCountHeader** - Tests the x-amz-tagging-count header in HeadObject

test/s3/tagging/s3_tagging_test.go

@@ -0,0 +1,433 @@
+package tagging
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/credentials"
+	"github.com/aws/aws-sdk-go-v2/service/s3"
+	"github.com/aws/aws-sdk-go-v2/service/s3/types"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// S3TestConfig holds configuration for S3 tests
+type S3TestConfig struct {
+	Endpoint      string
+	AccessKey     string
+	SecretKey     string
+	Region        string
+	BucketPrefix  string
+	UseSSL        bool
+	SkipVerifySSL bool
+}
+
+// getDefaultConfig returns a fresh instance of the default test configuration
+func getDefaultConfig() *S3TestConfig {
+	return &S3TestConfig{
+		Endpoint:      "http://localhost:8333", // Default SeaweedFS S3 port
+		AccessKey:     "some_access_key1",
+		SecretKey:     "some_secret_key1",
+		Region:        "us-east-1",
+		BucketPrefix:  "test-tagging-",
+		UseSSL:        false,
+		SkipVerifySSL: true,
+	}
+}
+
+// getS3Client creates an AWS S3 client for testing
+func getS3Client(t *testing.T) *s3.Client {
+	defaultConfig := getDefaultConfig()
+	cfg, err := config.LoadDefaultConfig(context.TODO(),
+		config.WithRegion(defaultConfig.Region),
+		config.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(
+			defaultConfig.AccessKey,
+			defaultConfig.SecretKey,
+			"",
+		)),
+		config.WithEndpointResolverWithOptions(aws.EndpointResolverWithOptionsFunc(
+			func(service, region string, options ...interface{}) (aws.Endpoint, error) {
+				return aws.Endpoint{
+					URL:           defaultConfig.Endpoint,
+					SigningRegion: defaultConfig.Region,
+				}, nil
+			})),
+	)
+	require.NoError(t, err)
+
+	client := s3.NewFromConfig(cfg, func(o *s3.Options) {
+		o.UsePathStyle = true
+	})
+	return client
+}
+
+// createTestBucket creates a test bucket with a unique name
+func createTestBucket(t *testing.T, client *s3.Client) string {
+	defaultConfig := getDefaultConfig()
+	bucketName := fmt.Sprintf("%s%d", defaultConfig.BucketPrefix, time.Now().UnixNano())
+
+	_, err := client.CreateBucket(context.TODO(), &s3.CreateBucketInput{
+		Bucket: aws.String(bucketName),
+	})
+	require.NoError(t, err)
+
+	// Wait for bucket metadata to be fully processed
+	time.Sleep(50 * time.Millisecond)
+
+	return bucketName
+}
+
+// cleanupTestBucket removes the test bucket and all its contents
+func cleanupTestBucket(t *testing.T, client *s3.Client, bucketName string) {
+	// First, delete all objects in the bucket
+	listResp, err := client.ListObjectsV2(context.TODO(), &s3.ListObjectsV2Input{
+		Bucket: aws.String(bucketName),
+	})
+	if err == nil {
+		for _, obj := range listResp.Contents {
+			_, err := client.DeleteObject(context.TODO(), &s3.DeleteObjectInput{
+				Bucket: aws.String(bucketName),
+				Key:    obj.Key,
+			})
+			if err != nil {
+				t.Logf("Warning: failed to delete object %s: %v", *obj.Key, err)
+			}
+		}
+	}
+
+	// Then delete the bucket
+	_, err = client.DeleteBucket(context.TODO(), &s3.DeleteBucketInput{
+		Bucket: aws.String(bucketName),
+	})
+	if err != nil {
+		t.Logf("Warning: failed to delete bucket %s: %v", bucketName, err)
+	}
+}
+
+// TestObjectTaggingOnUpload tests that tags sent during object upload (via X-Amz-Tagging header)
+// are properly stored and can be retrieved. This is the fix for GitHub issue #7589.
+func TestObjectTaggingOnUpload(t *testing.T) {
+	client := getS3Client(t)
+	bucketName := createTestBucket(t, client)
+	defer cleanupTestBucket(t, client, bucketName)
+
+	objectKey := "test-object-with-tags"
+	objectContent := "Hello, World!"
+
+	// Put object with tags using the Tagging parameter (X-Amz-Tagging header)
+	_, err := client.PutObject(context.TODO(), &s3.PutObjectInput{
+		Bucket:  aws.String(bucketName),
+		Key:     aws.String(objectKey),
+		Body:    strings.NewReader(objectContent),
+		Tagging: aws.String("env=production&team=platform"),
+	})
+	require.NoError(t, err, "Should be able to put object with tags")
+
+	// Get the tags back
+	tagResp, err := client.GetObjectTagging(context.TODO(), &s3.GetObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to get object tags")
+
+	// Verify tags were stored correctly
+	require.Len(t, tagResp.TagSet, 2, "Should have 2 tags")
+
+	// Build a map for easier assertion
+	tagMap := make(map[string]string)
+	for _, tag := range tagResp.TagSet {
+		tagMap[*tag.Key] = *tag.Value
+	}
+
+	assert.Equal(t, "production", tagMap["env"], "env tag should be 'production'")
+	assert.Equal(t, "platform", tagMap["team"], "team tag should be 'platform'")
+}
+
+// TestObjectTaggingOnUploadWithSpecialCharacters tests tags with URL-encoded characters
+func TestObjectTaggingOnUploadWithSpecialCharacters(t *testing.T) {
+	client := getS3Client(t)
+	bucketName := createTestBucket(t, client)
+	defer cleanupTestBucket(t, client, bucketName)
+
+	objectKey := "test-object-with-special-tags"
+	objectContent := "Hello, World!"
+
+	// Put object with tags containing special characters
+	// AWS SDK will URL-encode these automatically
+	_, err := client.PutObject(context.TODO(), &s3.PutObjectInput{
+		Bucket:  aws.String(bucketName),
+		Key:     aws.String(objectKey),
+		Body:    strings.NewReader(objectContent),
+		Tagging: aws.String("timestamp=2025-07-16 14:40:39&path=/tmp/file.txt"),
+	})
+	require.NoError(t, err, "Should be able to put object with special character tags")
+
+	// Get the tags back
+	tagResp, err := client.GetObjectTagging(context.TODO(), &s3.GetObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to get object tags")
+
+	// Verify tags were stored and URL-decoded correctly
+	require.Len(t, tagResp.TagSet, 2, "Should have 2 tags")
+
+	tagMap := make(map[string]string)
+	for _, tag := range tagResp.TagSet {
+		tagMap[*tag.Key] = *tag.Value
+	}
+
+	assert.Equal(t, "2025-07-16 14:40:39", tagMap["timestamp"], "timestamp tag should be decoded correctly")
+	assert.Equal(t, "/tmp/file.txt", tagMap["path"], "path tag should be decoded correctly")
+}
+
+// TestObjectTaggingOnUploadWithEmptyValue tests tags with empty values
+func TestObjectTaggingOnUploadWithEmptyValue(t *testing.T) {
+	client := getS3Client(t)
+	bucketName := createTestBucket(t, client)
+	defer cleanupTestBucket(t, client, bucketName)
+
+	objectKey := "test-object-with-empty-tag"
+	objectContent := "Hello, World!"
+
+	// Put object with a tag that has an empty value
+	_, err := client.PutObject(context.TODO(), &s3.PutObjectInput{
+		Bucket:  aws.String(bucketName),
+		Key:     aws.String(objectKey),
+		Body:    strings.NewReader(objectContent),
+		Tagging: aws.String("marker=&env=dev"),
+	})
+	require.NoError(t, err, "Should be able to put object with empty tag value")
+
+	// Get the tags back
+	tagResp, err := client.GetObjectTagging(context.TODO(), &s3.GetObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to get object tags")
+
+	// Verify tags were stored correctly
+	require.Len(t, tagResp.TagSet, 2, "Should have 2 tags")
+
+	tagMap := make(map[string]string)
+	for _, tag := range tagResp.TagSet {
+		tagMap[*tag.Key] = *tag.Value
+	}
+
+	assert.Equal(t, "", tagMap["marker"], "marker tag should have empty value")
+	assert.Equal(t, "dev", tagMap["env"], "env tag should be 'dev'")
+}
+
+// TestPutObjectTaggingAPI tests the PutObjectTagging API separately from upload
+func TestPutObjectTaggingAPI(t *testing.T) {
+	client := getS3Client(t)
+	bucketName := createTestBucket(t, client)
+	defer cleanupTestBucket(t, client, bucketName)
+
+	objectKey := "test-object-for-tagging-api"
+	objectContent := "Hello, World!"
+
+	// First, put object without tags
+	_, err := client.PutObject(context.TODO(), &s3.PutObjectInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+		Body:   strings.NewReader(objectContent),
+	})
+	require.NoError(t, err, "Should be able to put object without tags")
+
+	// Get tags - should be empty
+	tagResp, err := client.GetObjectTagging(context.TODO(), &s3.GetObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to get object tags")
+	assert.Len(t, tagResp.TagSet, 0, "Should have no tags initially")
+
+	// Now add tags using PutObjectTagging API
+	_, err = client.PutObjectTagging(context.TODO(), &s3.PutObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+		Tagging: &types.Tagging{
+			TagSet: []types.Tag{
+				{Key: aws.String("env"), Value: aws.String("staging")},
+				{Key: aws.String("version"), Value: aws.String("1.0")},
+			},
+		},
+	})
+	require.NoError(t, err, "Should be able to put object tags via API")
+
+	// Get tags - should now have the tags
+	tagResp, err = client.GetObjectTagging(context.TODO(), &s3.GetObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to get object tags after PutObjectTagging")
+	require.Len(t, tagResp.TagSet, 2, "Should have 2 tags")
+
+	tagMap := make(map[string]string)
+	for _, tag := range tagResp.TagSet {
+		tagMap[*tag.Key] = *tag.Value
+	}
+
+	assert.Equal(t, "staging", tagMap["env"], "env tag should be 'staging'")
+	assert.Equal(t, "1.0", tagMap["version"], "version tag should be '1.0'")
+}
+
+// TestDeleteObjectTagging tests the DeleteObjectTagging API
+func TestDeleteObjectTagging(t *testing.T) {
+	client := getS3Client(t)
+	bucketName := createTestBucket(t, client)
+	defer cleanupTestBucket(t, client, bucketName)
+
+	objectKey := "test-object-for-delete-tags"
+	objectContent := "Hello, World!"
+
+	// Put object with tags
+	_, err := client.PutObject(context.TODO(), &s3.PutObjectInput{
+		Bucket:  aws.String(bucketName),
+		Key:     aws.String(objectKey),
+		Body:    strings.NewReader(objectContent),
+		Tagging: aws.String("env=production"),
+	})
+	require.NoError(t, err, "Should be able to put object with tags")
+
+	// Verify tags exist
+	tagResp, err := client.GetObjectTagging(context.TODO(), &s3.GetObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to get object tags")
+	require.Len(t, tagResp.TagSet, 1, "Should have 1 tag")
+
+	// Delete tags
+	_, err = client.DeleteObjectTagging(context.TODO(), &s3.DeleteObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to delete object tags")
+
+	// Verify tags are deleted
+	tagResp, err = client.GetObjectTagging(context.TODO(), &s3.GetObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to get object tags after deletion")
+	assert.Len(t, tagResp.TagSet, 0, "Should have no tags after deletion")
+}
+
+// TestTagsNotPreservedAfterObjectOverwrite tests that tags are NOT preserved when an object is overwritten
+// This matches AWS S3 behavior where overwriting an object replaces all metadata including tags
+func TestTagsNotPreservedAfterObjectOverwrite(t *testing.T) {
+	client := getS3Client(t)
+	bucketName := createTestBucket(t, client)
+	defer cleanupTestBucket(t, client, bucketName)
+
+	objectKey := "test-object-overwrite-tags"
+	objectContent := "Original content"
+
+	// Put object with tags
+	_, err := client.PutObject(context.TODO(), &s3.PutObjectInput{
+		Bucket:  aws.String(bucketName),
+		Key:     aws.String(objectKey),
+		Body:    strings.NewReader(objectContent),
+		Tagging: aws.String("original=true"),
+	})
+	require.NoError(t, err, "Should be able to put object with tags")
+
+	// Verify original tags exist
+	tagResp, err := client.GetObjectTagging(context.TODO(), &s3.GetObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to get object tags")
+	require.Len(t, tagResp.TagSet, 1, "Should have 1 tag")
+	assert.Equal(t, "original", *tagResp.TagSet[0].Key)
+
+	// Overwrite the object WITHOUT tags
+	_, err = client.PutObject(context.TODO(), &s3.PutObjectInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+		Body:   strings.NewReader("New content"),
+	})
+	require.NoError(t, err, "Should be able to overwrite object")
+
+	// Tags should be gone after overwrite (matches AWS S3 behavior)
+	tagResp, err = client.GetObjectTagging(context.TODO(), &s3.GetObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to get object tags after overwrite")
+	assert.Len(t, tagResp.TagSet, 0, "Tags should be cleared after object overwrite")
+}
+
+// TestMaximumNumberOfTags tests that we can store the maximum 10 tags per object
+func TestMaximumNumberOfTags(t *testing.T) {
+	client := getS3Client(t)
+	bucketName := createTestBucket(t, client)
+	defer cleanupTestBucket(t, client, bucketName)
+
+	objectKey := "test-object-max-tags"
+	objectContent := "Hello, World!"
+
+	// Build 10 tags (S3 max)
+	tags := []string{}
+	for i := 1; i <= 10; i++ {
+		tags = append(tags, fmt.Sprintf("key%d=value%d", i, i))
+	}
+	tagging := strings.Join(tags, "&")
+
+	// Put object with 10 tags
+	_, err := client.PutObject(context.TODO(), &s3.PutObjectInput{
+		Bucket:  aws.String(bucketName),
+		Key:     aws.String(objectKey),
+		Body:    strings.NewReader(objectContent),
+		Tagging: aws.String(tagging),
+	})
+	require.NoError(t, err, "Should be able to put object with 10 tags")
+
+	// Get the tags back
+	tagResp, err := client.GetObjectTagging(context.TODO(), &s3.GetObjectTaggingInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to get object tags")
+	assert.Len(t, tagResp.TagSet, 10, "Should have 10 tags")
+}
+
+// TestTagCountHeader tests that the x-amz-tagging-count header is returned in HeadObject
+func TestTagCountHeader(t *testing.T) {
+	client := getS3Client(t)
+	bucketName := createTestBucket(t, client)
+	defer cleanupTestBucket(t, client, bucketName)
+
+	objectKey := "test-object-tag-count"
+	objectContent := "Hello, World!"
+
+	// Put object with tags
+	_, err := client.PutObject(context.TODO(), &s3.PutObjectInput{
+		Bucket:  aws.String(bucketName),
+		Key:     aws.String(objectKey),
+		Body:    strings.NewReader(objectContent),
+		Tagging: aws.String("env=prod&team=backend&version=2.0"),
+	})
+	require.NoError(t, err, "Should be able to put object with tags")
+
+	// Head object to get tag count
+	headResp, err := client.HeadObject(context.TODO(), &s3.HeadObjectInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	})
+	require.NoError(t, err, "Should be able to head object")
+
+	// Check tag count header
+	if headResp.TagCount != nil {
+		assert.Equal(t, int32(3), *headResp.TagCount, "Tag count should be 3")
+	} else {
+		t.Log("Warning: TagCount header not returned - this may be expected depending on implementation")
+	}
+}

weed/s3api/s3api_object_handlers_put.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/url"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -548,6 +549,28 @@ func (s3a *S3ApiServer) putToFiler(r *http.Request, filePath string, dataReader
 		}
 	}
 
+	// Parse and store object tags from X-Amz-Tagging header
+	// Fix for GitHub issue #7589: Tags sent during object upload were not being stored
+	if tagging := r.Header.Get(s3_constants.AmzObjectTagging); tagging != "" {
+		parsedTags, err := url.ParseQuery(tagging)
+		if err != nil {
+			glog.Warningf("putToFiler: Invalid S3 tag format in header '%s': %v", tagging, err)
+			return "", s3err.ErrInvalidTag, SSEResponseMetadata{}
+		}
+		for key, values := range parsedTags {
+			if len(values) > 1 {
+				glog.Warningf("putToFiler: Duplicate tag key '%s' in header", key)
+				return "", s3err.ErrInvalidTag, SSEResponseMetadata{}
+			}
+			value := ""
+			if len(values) > 0 {
+				value = values[0]
+			}
+			entry.Extended[s3_constants.AmzObjectTagging+"-"+key] = []byte(value)
+		}
+		glog.V(3).Infof("putToFiler: stored %d tags from X-Amz-Tagging header", len(parsedTags))
+	}
+
 	// Set SSE-C metadata
 	if customerKey != nil && len(sseIV) > 0 {
 		// Store IV as RAW bytes (matches filer behavior - filer decodes base64 headers and stores raw bytes)