owncloud/core

<?php
/**
 * @author Björn Schießle <bjoern@schiessle.org>
 * @author Michael Gapczynski <GapczynskiM@gmail.com>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Roeland Jago Douma <rullzer@owncloud.com>
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @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;

class Updater {
    /**
     * @param array $params
     */
    public static function renameHook($params) {
        self::renameChildren($params['oldpath'], $params['newpath']);
        self::moveShareToShare($params['newpath']);
    }

    /**
     * Fix for https://github.com/owncloud/core/issues/20769
     *
     * The owner is allowed to move their files (if they are shared) into a receiving folder
     * In this case we need to update the parent of the moved share. Since they are
     * effectively handing over ownership of the file the rest of the code needs to know
     * they need to build up the reshare tree.
     *
     * @param string $path
     */
    private static function moveShareToShare($path) {
        $userFolder = \OC::$server->getUserFolder();

        // If the user folder can't be constructed (e.g. link share) just return.
        if ($userFolder === null) {
            return;
        }

        $src = $userFolder->get($path);

        $shareManager = \OC::$server->getShareManager();

        $shares = $shareManager->getSharesBy($userFolder->getOwner()->getUID(), \OCP\Share::SHARE_TYPE_USER, $src, false, -1);
        $shares = \array_merge($shares, $shareManager->getSharesBy($userFolder->getOwner()->getUID(), \OCP\Share::SHARE_TYPE_GROUP, $src, false, -1));
        $shares = \array_merge($shares, $shareManager->getSharesBy($userFolder->getOwner()->getUID(), \OCP\Share::SHARE_TYPE_LINK, $src, false, -1));

        // If the path we move is not a share we don't care
        if (empty($shares)) {
            return;
        }

        // Check if the destination is inside a share
        $mountManager = \OC::$server->getMountManager();
        $dstMount = $mountManager->find($src->getPath());
        if (!($dstMount instanceof \OCA\Files_Sharing\SharedMount)) {
            // expected OC\Files\Mount\MountPoint
            $newOwner = $dstMount->getStorage()->getOwner('');
        } else {
            $newOwner = $dstMount->getShare()->getShareOwner();
        }

        //Ownership is moved over
        foreach ($shares as $share) {
            /** @var \OCP\Share\IShare $share */
            if ($share->getSharedWith() !== $newOwner) {
                $share->setShareOwner($newOwner);
                $shareManager->updateShare($share);
            } else {
                $shareManager->deleteShare($share);
            }
        }
    }

    /**
     * rename mount point from the children if the parent was renamed
     *
     * @param string $oldPath old path relative to data/user/files
     * @param string $newPath new path relative to data/user/files
     */
    private static function renameChildren($oldPath, $newPath) {
        $absNewPath =  \OC\Files\Filesystem::normalizePath('/' . \OCP\User::getUser() . '/files/' . $newPath);
        $absOldPath =  \OC\Files\Filesystem::normalizePath('/' . \OCP\User::getUser() . '/files/' . $oldPath);

        $mountManager = \OC\Files\Filesystem::getMountManager();
        $mountedShares = $mountManager->findIn('/' . \OCP\User::getUser() . '/files/' . $oldPath);
        foreach ($mountedShares as $mount) {
            if ($mount->getStorage()->instanceOfStorage('OCA\Files_Sharing\ISharedStorage')) {
                $mountPoint = $mount->getMountPoint();
                $target = \str_replace($absOldPath, $absNewPath, $mountPoint);
                '@phan-var \OCA\Files_Sharing\SharedMount $mount';
                $mount->moveMount($target);
            }
        }
    }
}