private function commandReply($message)
 {
     $telegramId = $message['from']['id'];
     $tg = TelegramUser::findByTelegramId($telegramId);
     $params = array('chat_id' => $telegramId);
     if ($tg->status == 'revoke_access') {
         $clientId = preg_replace('/[^0-9,.]/', '', $message['text']);
         try {
             $app = App::findByClientId($clientId);
             $auth = Auth::findByAppAndTelegramUser($app, $tg);
             $auth->active = false;
             $auth->save();
             $text = 'Access to this app has been revoked.';
             $tg->status = 'access_revoked';
             $params['reply_markup'] = json_encode(['hide_keyboard' => true]);
         } catch (ModelNotFoundException $e) {
             $text = 'Unknown app. Please choose an app from the given list:';
         }
     } else {
         $text = 'Unknown command.';
         $tg->status = 'unknown_command';
         $params['reply_markup'] = json_encode(['hide_keyboard' => true]);
     }
     $params['text'] = $text;
     $this->send($params);
     $tg->save();
 }