Allow group backend to declare users as admins

Signed-off-by: Knut Ahlers <knut@ahlers.me>

lib/private/Group/Backend.php

@@ -38,6 +38,7 @@ abstract class Backend implements \OCP\GroupInterface {
 		self::REMOVE_FROM_GOUP => 'removeFromGroup',
 		self::COUNT_USERS => 'countUsersInGroup',
 		self::GROUP_DETAILS => 'getGroupDetails',
+		self::IS_ADMIN => 'isAdmin',
 	];
 
 	/**

lib/private/Group/Manager.php

@@ -288,6 +288,11 @@ class Manager extends PublicEmitter implements IGroupManager {
 	 * @return bool if admin
 	 */
 	public function isAdmin($userId) {
+		foreach ($this->backends as $backend) {
+			if ($backend->implementsActions(\OC\Group\Backend::IS_ADMIN) && $backend->isAdmin($userId)) {
+				return true;
+			}
+		}
 		return $this->isInGroup($userId, 'admin');
 	}
 

lib/public/GroupInterface.php

@@ -51,6 +51,7 @@ interface GroupInterface {
 	//OBSOLETE const GET_DISPLAYNAME	= 0x00010000;
 	const COUNT_USERS		= 0x00100000;
 	const GROUP_DETAILS		= 0x01000000;
+	const IS_ADMIN  = 0x10000000;
 
 	/**
 	 * Check if backend implements actions