anchor.diff:    }
   
     static void handleLogout(HttpContext ctx) {
  -    if (!filterIsMaster(ctx)) {
  +    if (!_filterIsMaster(ctx)) {
         return;
       }
       _removeSessionToken(ctx)
  
positive.code:   }
  
    static handleUpload(HttpContext ctx) {
      if (!filterIsMaster(ctx)) {
        return;
      }
      PinLogger.instance.fine('[CartAction] handleUpload: Start to handle file upload action.');
  
negative.code:     return isMaster;
    }
  
    static bool _filterIsMaster(HttpContext ctx) {
      bool isUserMaster = isMaster(ctx);
  
      if(!isUserMaster) {
  