Add trait to support new interface in a backward compatible way

src/User/AuthClient/Facebook.php

@@ -12,10 +12,14 @@
 namespace Da\User\AuthClient;
 
 use Da\User\Contracts\AuthClientInterface;
+use Da\User\Traits\AuthClientUserIdTrait;
 use yii\authclient\clients\Facebook as BaseFacebook;
 
 class Facebook extends BaseFacebook implements AuthClientInterface
 {
+
+    use AuthClientUserIdTrait;
+    
     /**
      * {@inheritdoc}
      */

src/User/AuthClient/GitHub.php

@@ -12,10 +12,12 @@
 namespace Da\User\AuthClient;
 
 use Da\User\Contracts\AuthClientInterface;
+use Da\User\Traits\AuthClientUserIdTrait;
 use yii\authclient\clients\GitHub as BaseGitHub;
 
 class GitHub extends BaseGitHub implements AuthClientInterface
 {
+    use AuthClientUserIdTrait;
     /**
      * {@inheritdoc}
      */

src/User/AuthClient/Google.php

@@ -12,10 +12,12 @@
 namespace Da\User\AuthClient;
 
 use Da\User\Contracts\AuthClientInterface;
+use Da\User\Traits\AuthClientUserIdTrait;
 use yii\authclient\clients\Google as BaseGoogle;
 
 class Google extends BaseGoogle implements AuthClientInterface
 {
+    use AuthClientUserIdTrait;
     /**
      * {@inheritdoc}
      */

src/User/AuthClient/LinkedIn.php

@@ -12,10 +12,13 @@
 namespace Da\User\AuthClient;
 
 use Da\User\Contracts\AuthClientInterface;
+use Da\User\Traits\AuthClientUserIdTrait;
 use yii\authclient\clients\LinkedIn as BaseLinkedIn;
 
 class LinkedIn extends BaseLinkedIn implements AuthClientInterface
 {
+    use AuthClientUserIdTrait;
+    
     /**
      * {@inheritdoc}
      */

src/User/AuthClient/Twitter.php

@@ -12,10 +12,13 @@
 namespace Da\User\AuthClient;
 
 use Da\User\Contracts\AuthClientInterface;
+use Da\User\Traits\AuthClientUserIdTrait;
 use yii\authclient\clients\Twitter as BaseTwitter;
 
 class Twitter extends BaseTwitter implements AuthClientInterface
 {
+    use AuthClientUserIdTrait;
+    
     /**
      * @return string
      */

src/User/AuthClient/VKontakte.php

@@ -12,11 +12,14 @@
 namespace Da\User\AuthClient;
 
 use Da\User\Contracts\AuthClientInterface;
+use Da\User\Traits\AuthClientUserIdTrait;
 use Yii;
 use yii\authclient\clients\VKontakte as BaseVKontakte;
 
 class VKontakte extends BaseVKontakte implements AuthClientInterface
 {
+    use AuthClientUserIdTrait;
+    
     /**
      * {@inheritdoc}
      */

src/User/AuthClient/Yandex.php

@@ -12,11 +12,14 @@
 namespace Da\User\AuthClient;
 
 use Da\User\Contracts\AuthClientInterface;
+use Da\User\Traits\AuthClientUserIdTrait;
 use Yii;
 use yii\authclient\clients\Yandex as BaseYandex;
 
 class Yandex extends BaseYandex implements AuthClientInterface
 {
+    use AuthClientUserIdTrait;
+    
     /**
      * {@inheritdoc}
      */

src/User/Traits/AuthClientUserIdTrait.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Da\User\Traits;
+
+trait AuthClientUserIdTrait
+{
+    /**
+     * @see \Da\User\Contracts\AuthClientInterface::getUserId()
+     */
+    public function getUserId()
+    {
+        return $this->getUserAttributes()['id'] ?? null;
+    }
+}