nextcloud-server/apps/lookup_server_connector/appinfo/app.php

<?php
/**
 * @copyright Copyright (c) 2016 Bjoern Schiessle <bjoern@schiessle.org>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

$dispatcher = \OC::$server->getEventDispatcher();

$dispatcher->addListener('OC\AccountManager::userUpdated', function(\Symfony\Component\EventDispatcher\GenericEvent $event) {
	/** @var \OCP\IUser $user */
	$user = $event->getSubject();

	/** @var \OCA\LookupServerConnector\UpdateLookupServer $updateLookupServer */
	$updateLookupServer = \OC::$server->query(\OCA\LookupServerConnector\UpdateLookupServer::class);
	$updateLookupServer->userUpdated($user);
});