Let LimitReader read MaxFileSizeBytes + 1

mediaapi/routing/upload.go

@@ -147,7 +147,7 @@ func (r *uploadRequest) doUpload(
 	//   r.storeFileAndMetadata(ctx, tmpDir, ...)
 	// before you return from doUpload else we will leak a temp file. We could make this nicer with a `WithTransaction` style of
 	// nested function to guarantee either storage or cleanup.
-	lr := io.LimitReader(reqReader, int64(*cfg.MaxFileSizeBytes))
+	lr := io.LimitReader(reqReader, int64(*cfg.MaxFileSizeBytes)+1)
 	hash, bytesWritten, tmpDir, err := fileutils.WriteTempFile(ctx, lr, cfg.AbsBasePath)
 	if err != nil {
 		r.Logger.WithError(err).WithFields(log.Fields{
@@ -159,9 +159,8 @@ func (r *uploadRequest) doUpload(
 		}
 	}
 
-	// Check if temp file size is greater (should not happen, LimitReader stops when the defined size is reached.)
+	// Check if temp file size exceeds max file size configuration
-	// or equal to the max file size configuration.
+	if bytesWritten > types.FileSizeBytes(*cfg.MaxFileSizeBytes) {
-	if bytesWritten >= types.FileSizeBytes(*cfg.MaxFileSizeBytes) {
 		fileutils.RemoveDir(tmpDir, r.Logger) // delete temp file
 		return requestEntityTooLargeJSONResponse(*cfg.MaxFileSizeBytes)
 	}

mediaapi/routing/upload_test.go

@@ -83,6 +83,23 @@ func Test_uploadRequest_doUpload(t *testing.T) {
 			},
 			want: nil,
 		},
+		{
+			name: "upload ok (exact size)",
+			args: args{
+				ctx:       context.Background(),
+				reqReader: strings.NewReader("testtest"),
+				cfg:       cfg,
+				db:        db,
+			},
+			fields: fields{
+				Logger: logger,
+				MediaMetadata: &types.MediaMetadata{
+					MediaID:    "1338",
+					UploadName: "test ok (exact size)",
+				},
+			},
+			want: nil,
+		},
 		{
 			name: "upload not ok",
 			args: args{
@@ -94,7 +111,7 @@ func Test_uploadRequest_doUpload(t *testing.T) {
 			fields: fields{
 				Logger: logger,
 				MediaMetadata: &types.MediaMetadata{
-					MediaID:    "1337",
+					MediaID:    "1339",
 					UploadName: "test fail",
 				},
 			},