Rewrite of the authentication and authorization system

app/Core/User/GroupSync.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Kanboard\Core\User;
+
+use Kanboard\Core\Base;
+
+/**
+ * Group Synchronization
+ *
+ * @package  user
+ * @author   Frederic Guillot
+ */
+class GroupSync extends Base
+{
+    /**
+     * Synchronize group membership
+     *
+     * @access public
+     * @param  integer  $userId
+     * @param  array    $groupIds
+     */
+    public function synchronize($userId, array $groupIds)
+    {
+        foreach ($groupIds as $groupId) {
+            $group = $this->group->getByExternalId($groupId);
+
+            if (! empty($group) && ! $this->groupMember->isMember($group['id'], $userId)) {
+                $this->groupMember->addUser($group['id'], $userId);
+            }
+        }
+    }
+}