Added application and project roles validation for API procedure calls

app/Api/Procedure/GroupMemberProcedure.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Kanboard\Api\Procedure;
+
+/**
+ * Group Member API controller
+ *
+ * @package  Kanboard\Api\Procedure
+ * @author   Frederic Guillot
+ */
+class GroupMemberProcedure extends BaseProcedure
+{
+    public function getMemberGroups($user_id)
+    {
+        return $this->groupMemberModel->getGroups($user_id);
+    }
+
+    public function getGroupMembers($group_id)
+    {
+        return $this->groupMemberModel->getMembers($group_id);
+    }
+
+    public function addGroupMember($group_id, $user_id)
+    {
+        return $this->groupMemberModel->addUser($group_id, $user_id);
+    }
+
+    public function removeGroupMember($group_id, $user_id)
+    {
+        return $this->groupMemberModel->removeUser($group_id, $user_id);
+    }
+
+    public function isGroupMember($group_id, $user_id)
+    {
+        return $this->groupMemberModel->isMember($group_id, $user_id);
+    }
+}