server/apps/files_sharing/lib/Hooks.php

<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Björn Schießle <bjoern@schiessle.org>
 * @author Joas Schilling <coding@schilljs.com>
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Robin Appelman <robin@icewind.nl>
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * 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, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

namespace OCA\Files_Sharing;

use OC\Files\Filesystem;
use OCA\FederatedFileSharing\DiscoveryManager;

class Hooks {

	public static function deleteUser($params) {
		$manager = new External\Manager(
			\OC::$server->getDatabaseConnection(),
			\OC\Files\Filesystem::getMountManager(),
			\OC\Files\Filesystem::getLoader(),
			\OC::$server->getHTTPClientService(),
			\OC::$server->getNotificationManager(),
			\OC::$server->query(\OCP\OCS\IDiscoveryService::class),
			$params['uid']);

		$manager->removeUserShares($params['uid']);
	}

	public static function unshareChildren($params) {
		$path = Filesystem::getView()->getAbsolutePath($params['path']);
		$view = new \OC\Files\View('/');

		// find share mount points within $path and unmount them
		$mountManager = \OC\Files\Filesystem::getMountManager();
		$mountedShares = $mountManager->findIn($path);
		foreach ($mountedShares as $mount) {
			if ($mount->getStorage()->instanceOfStorage(ISharedStorage::class)) {
				$mountPoint = $mount->getMountPoint();
				$view->unlink($mountPoint);
			}
		}
	}
}