S3 Object Lock: ensure x-amz-bucket-object-lock-enabled header (#6990)

* ensure x-amz-bucket-object-lock-enabled header

* fix tests

* combine 2 metadata changes into one

* address comments

* Update s3api_bucket_handlers.go

* Update weed/s3api/s3api_bucket_handlers.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update test/s3/retention/object_lock_reproduce_test.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update test/s3/retention/object_lock_validation_test.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update test/s3/retention/s3_bucket_object_lock_test.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/s3api/s3api_bucket_handlers.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/s3api/s3api_bucket_handlers.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update test/s3/retention/s3_bucket_object_lock_test.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update weed/s3api/s3api_bucket_handlers.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* package name

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

test/s3/retention/object_lock_validation_test.go

@@ -0,0 +1,105 @@
+package retention
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/aws-sdk-go-v2/service/s3"
+	"github.com/aws/aws-sdk-go-v2/service/s3/types"
+	"github.com/stretchr/testify/require"
+)
+
+// TestObjectLockValidation tests that S3 Object Lock functionality works end-to-end
+// This test focuses on the complete Object Lock workflow that S3 clients expect
+func TestObjectLockValidation(t *testing.T) {
+	client := getS3Client(t)
+	bucketName := fmt.Sprintf("object-lock-test-%d", time.Now().UnixNano())
+
+	t.Logf("=== Validating S3 Object Lock Functionality ===")
+	t.Logf("Bucket: %s", bucketName)
+
+	// Step 1: Create bucket with Object Lock header
+	t.Log("\n1. Creating bucket with x-amz-bucket-object-lock-enabled: true")
+	_, err := client.CreateBucket(context.TODO(), &s3.CreateBucketInput{
+		Bucket:                     aws.String(bucketName),
+		ObjectLockEnabledForBucket: true, // This sends x-amz-bucket-object-lock-enabled: true
+	})
+	require.NoError(t, err, "Bucket creation should succeed")
+	defer client.DeleteBucket(context.TODO(), &s3.DeleteBucketInput{Bucket: aws.String(bucketName)})
+	t.Log("   ✅ Bucket created successfully")
+
+	// Step 2: Check if Object Lock is supported (standard S3 client behavior)
+	t.Log("\n2. Testing Object Lock support detection")
+	_, err = client.GetObjectLockConfiguration(context.TODO(), &s3.GetObjectLockConfigurationInput{
+		Bucket: aws.String(bucketName),
+	})
+	require.NoError(t, err, "GetObjectLockConfiguration should succeed for Object Lock enabled bucket")
+	t.Log("   ✅ GetObjectLockConfiguration succeeded - Object Lock is properly enabled")
+
+	// Step 3: Verify versioning is enabled (required for Object Lock)
+	t.Log("\n3. Verifying versioning is automatically enabled")
+	versioningResp, err := client.GetBucketVersioning(context.TODO(), &s3.GetBucketVersioningInput{
+		Bucket: aws.String(bucketName),
+	})
+	require.NoError(t, err)
+	require.Equal(t, types.BucketVersioningStatusEnabled, versioningResp.Status, "Versioning should be automatically enabled")
+	t.Log("   ✅ Versioning automatically enabled")
+
+	// Step 4: Test actual Object Lock functionality
+	t.Log("\n4. Testing Object Lock retention functionality")
+
+	// Create an object
+	key := "protected-object.dat"
+	content := "Important data that needs immutable protection"
+	putResp, err := client.PutObject(context.TODO(), &s3.PutObjectInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(key),
+		Body:   strings.NewReader(content),
+	})
+	require.NoError(t, err)
+	require.NotNil(t, putResp.VersionId, "Object should have a version ID")
+	t.Log("   ✅ Object created with versioning")
+
+	// Apply Object Lock retention
+	retentionUntil := time.Now().Add(24 * time.Hour)
+	_, err = client.PutObjectRetention(context.TODO(), &s3.PutObjectRetentionInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(key),
+		Retention: &types.ObjectLockRetention{
+			Mode:            types.ObjectLockRetentionModeCompliance,
+			RetainUntilDate: aws.Time(retentionUntil),
+		},
+	})
+	require.NoError(t, err, "Setting Object Lock retention should succeed")
+	t.Log("   ✅ Object Lock retention applied successfully")
+
+	// Verify retention is in effect
+	_, err = client.DeleteObject(context.TODO(), &s3.DeleteObjectInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(key),
+	})
+	require.Error(t, err, "Object should be protected by retention and cannot be deleted")
+	t.Log("   ✅ Object is properly protected by retention policy")
+
+	// Verify we can read the object (should still work)
+	getResp, err := client.GetObject(context.TODO(), &s3.GetObjectInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(key),
+	})
+	require.NoError(t, err, "Reading protected object should still work")
+	defer getResp.Body.Close()
+	t.Log("   ✅ Protected object can still be read")
+
+	t.Log("\n🎉 S3 OBJECT LOCK VALIDATION SUCCESSFUL!")
+	t.Log("   - Bucket creation with Object Lock header works")
+	t.Log("   - Object Lock support detection works (GetObjectLockConfiguration succeeds)")
+	t.Log("   - Versioning is automatically enabled")
+	t.Log("   - Object Lock retention functionality works")
+	t.Log("   - Objects are properly protected from deletion")
+	t.Log("")
+	t.Log("✅ S3 clients will now recognize SeaweedFS as supporting Object Lock!")
+}