fix: report the last upload in ListMultipartUploads next markers on a single page

NextKeyMarker and NextUploadIdMarker were only set for a truncated
listing, so a ListMultipartUploads response that fit in one page
returned them empty. S3 still sets them to the key and upload ID of
the last upload in the response.

Fill both markers from the last listed upload when the listing is not
truncated, including the case where the page ends exactly at
max-uploads. A page of common prefixes only keeps them empty, as
before. Enable the REST test that covers it.

Fixes #2144

tests/integration/ListMultipartUploads.go

@@ -152,6 +152,57 @@ func ListMultipartUploads_max_uploads(s *S3Conf) error {
 	})
 }
 
+func ListMultipartUploads_next_markers_not_truncated(s *S3Conf) error {
+	testName := "ListMultipartUploads_next_markers_not_truncated"
+	return actionHandler(s, testName, func(s3client *s3.Client, bucket string) error {
+		uploads := []types.MultipartUpload{}
+		for _, key := range []string{"bar", "baz", "foo"} {
+			out, err := createMp(s3client, bucket, key)
+			if err != nil {
+				return err
+			}
+			uploads = append(uploads, types.MultipartUpload{
+				UploadId:     out.UploadId,
+				Key:          out.Key,
+				StorageClass: types.StorageClassStandard,
+			})
+		}
+		last := uploads[len(uploads)-1]
+
+		// a single page still reports the last upload in the next markers,
+		// with the default max-uploads and with one equal to the upload count
+		for _, maxUploads := range []*int32{nil, getPtr(int32(len(uploads)))} {
+			ctx, cancel := context.WithTimeout(context.Background(), shortTimeout)
+			out, err := s3client.ListMultipartUploads(ctx, &s3.ListMultipartUploadsInput{
+				Bucket:     &bucket,
+				MaxUploads: maxUploads,
+			})
+			cancel()
+			if err != nil {
+				return err
+			}
+
+			if out.IsTruncated == nil || *out.IsTruncated {
+				return fmt.Errorf("expected a non-truncated response")
+			}
+			if ok := compareMultipartUploads(out.Uploads, uploads); !ok {
+				return fmt.Errorf("expected multipart uploads to be %v, instead got %v",
+					uploads, out.Uploads)
+			}
+			if getString(out.NextKeyMarker) != getString(last.Key) {
+				return fmt.Errorf("expected next-key-marker to be %v, instead got %v",
+					getString(last.Key), getString(out.NextKeyMarker))
+			}
+			if getString(out.NextUploadIdMarker) != getString(last.UploadId) {
+				return fmt.Errorf("expected next-upload-id-marker to be %v, instead got %v",
+					getString(last.UploadId), getString(out.NextUploadIdMarker))
+			}
+		}
+
+		return nil
+	})
+}
+
 func ListMultipartUploads_exceeding_max_uploads(s *S3Conf) error {
 	testName := "ListMultipartUploads_exceeding_max_uploads"
 	return actionHandler(s, testName, func(s3client *s3.Client, bucket string) error {

tests/integration/group-tests.go

@@ -542,6 +542,7 @@ func TestListMultipartUploads(ts *TestState) {
 	ts.Run(ListMultipartUploads_empty_result)
 	ts.Run(ListMultipartUploads_invalid_max_uploads)
 	ts.Run(ListMultipartUploads_max_uploads)
+	ts.Run(ListMultipartUploads_next_markers_not_truncated)
 	ts.Run(ListMultipartUploads_exceeding_max_uploads)
 	ts.Run(ListMultipartUploads_ignore_upload_id_marker)
 	ts.Run(ListMultipartUploads_invalid_uploadId_marker)
@@ -3250,6 +3251,7 @@ func GetIntTests() IntTests {
 		"ListMultipartUploads_empty_result":                                                ListMultipartUploads_empty_result,
 		"ListMultipartUploads_invalid_max_uploads":                                         ListMultipartUploads_invalid_max_uploads,
 		"ListMultipartUploads_max_uploads":                                                 ListMultipartUploads_max_uploads,
+		"ListMultipartUploads_next_markers_not_truncated":                                  ListMultipartUploads_next_markers_not_truncated,
 		"ListMultipartUploads_exceeding_max_uploads":                                       ListMultipartUploads_exceeding_max_uploads,
 		"ListMultipartUploads_ignore_upload_id_marker":                                     ListMultipartUploads_ignore_upload_id_marker,
 		"ListMultipartUploads_invalid_uploadId_marker":                                     ListMultipartUploads_invalid_uploadId_marker,

tests/test_rest_list_multipart_uploads.sh

@@ -50,9 +50,6 @@ source ./tests/setup.sh
 
 # tags: curl,ListMultipartUploads,multipart,uploadId,next-key-marker,next-upload-id-marker
 @test "REST - ListMultipartUploads - NextKeyMarker and NextUploadIdMarker set to last item" {
-  if [ "$DIRECT" != "true" ]; then
-    skip "https://github.com/versity/versitygw/issues/2144"
-  fi
   run setup_bucket_and_files_v3 "$BUCKET_ONE_NAME" 2
   assert_success
   read -r bucket_name test_file_one test_file_two <<< "$output"