public function run()
 {
     if (!kernel()->currentUser->hasLoggedIn()) {
         return $this->error('無上傳權限。');
     }
     parent::run();
     $filePath = $this->arg('file');
     $session = kernel()->session;
     $session->set('_current_upload', $filePath);
     return $this->success('上傳成功', ['filepath' => $filePath]);
 }