Add support for groups

Author: InuSasha

Template/config/integration.php

@@ -40,6 +40,10 @@
     <?= $this->form->text('oauth2_email_domains', $values) ?>
     <p class="form-help"><?= t('Use a comma to enter multiple domains: domain1.tld, domain2.tld') ?></p>
 
+    <?= $this->form->label(t('Groups Key'), 'oauth2_key_groups') ?>
+    <?= $this->form->text('oauth2_key_groups', $values) ?>
+    <p class="form-help"><?= t('Leave empty, when no group mapping is wanted') ?></p>
+
     <div class="form-actions">
         <input type="submit" value="<?= t('Save') ?>" class="btn btn-blue"/>
     </div>

User/GenericOAuth2UserProvider.php

@@ -157,7 +157,21 @@ public function getEmail()
      */
     public function getExternalGroupIds()
     {
-        return array();
+        $groups = $this->getKey('oauth2_key_groups');
+
+        if (empty($groups)) {
+            $this->logger->debug('OAuth2: '.$this->getUsername().' has no groups');
+            return array();
+        }
+
+        $groups = array_unique($groups);
+        $this->logger->debug('OAuth2: '.$this->getUsername().' groups are '. join(',', $groups));
+
+        foreach ($groups as $group) {
+            $this->groupModel->getOrCreateExternalGroupId($group, $group);
+        }
+
+        return $groups;
     }
 
     /**