/**
  * 绑定第三方账号
  * @param  ClientInterface $client
  * @return \yii\web\Response
  */
 public function connect(ClientInterface $client)
 {
     $attributes = $client->getUserAttributes();
     $provider = $client->getId();
     $clientId = $attributes['id'];
     $account = $this->finder->findAccountByProviderAndClientId($provider, $clientId);
     if ($account === null) {
         $account = Yii::createObject(['class' => UserAccount::className(), 'provider' => $provider, 'client_id' => $clientId, 'data' => json_encode($attributes), 'user_id' => Yii::$app->user->id, 'created_at' => time()]);
         $account->save(false);
         Yii::$app->session->setFlash('success', '账号绑定成功');
     } else {
         Yii::$app->session->setFlash('error', '绑定失败,此账号已经绑定过了');
     }
     $this->action->successUrl = Url::to(['/user/setting/networks']);
 }