owncloud/core

<?php
/**
 * @author Jörn Friedrich Dreyer <jfd@butonic.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 OC\Repair;

use OCP\Files\IRootFolder;
use OCP\IDBConnection;
use OCP\IUser;
use OCP\IUserManager;
use OCP\Migration\IOutput;
use OCP\Migration\IRepairStep;

/**
 * Class RemoveRootShares
 *
 * @package OC\Repair
 */
class RemoveRootShares implements IRepairStep {
    /** @var IDBConnection */
    protected $connection;

    /** @var IUserManager */
    protected $userManager;

    /** @var IRootFolder */
    protected $rootFolder;

    /**
     * RemoveRootShares constructor.
     *
     * @param IDBConnection $connection
     * @param IUserManager $userManager
     * @param IRootFolder $rootFolder
     */
    public function __construct(
        IDBConnection $connection,
        IUserManager $userManager,
        IRootFolder $rootFolder
    ) {
        $this->connection = $connection;
        $this->userManager = $userManager;
        $this->rootFolder = $rootFolder;
    }

    /**
     * @return string
     */
    public function getName() {
        return 'Remove shares of a users root folder';
    }

    /**
     * @param IOutput $output
     */
    public function run(IOutput $output) {
        if ($this->rootSharesExist()) {
            $this->removeRootShares($output);
        }
    }

    /**
     * @param IOutput $output
     */
    private function removeRootShares(IOutput $output) {
        $function = function (IUser $user) use ($output) {
            $userFolder = $this->rootFolder->getUserFolder($user->getUID());
            $fileId = $userFolder->getId();

            $qb = $this->connection->getQueryBuilder();
            $qb->delete('share')
                ->where($qb->expr()->eq('file_source', $qb->createNamedParameter($fileId)))
                ->andWhere($qb->expr()->orX(
                    $qb->expr()->eq('item_type', $qb->expr()->literal('file')),
                    $qb->expr()->eq('item_type', $qb->expr()->literal('folder'))
                ));

            $qb->execute();

            $output->advance();
        };

        $output->startProgress($this->userManager->countSeenUsers());

        $this->userManager->callForSeenUsers($function);

        $output->finishProgress();
    }

    /**
     * Verify if this repair steps is required
     * It *should* not be necessary in most cases and it can be very
     * costly.
     *
     * @return bool
     */
    private function rootSharesExist() {
        $qb = $this->connection->getQueryBuilder();
        $qb2 = $this->connection->getQueryBuilder();

        $qb->select('fileid')
            ->from('filecache')
            ->where($qb->expr()->eq('path', $qb->expr()->literal('files')));

        $qb2->select('id')
            ->from('share')
            ->where($qb2->expr()->in('file_source', $qb2->createFunction($qb->getSQL())))
            ->andWhere($qb2->expr()->orX(
                $qb2->expr()->eq('item_type', $qb->expr()->literal('file')),
                $qb2->expr()->eq('item_type', $qb->expr()->literal('folder'))
            ))
            ->setMaxResults(1);

        $cursor = $qb2->execute();
        $data = $cursor->fetch();
        $cursor->closeCursor();

        if ($data === false) {
            return false;
        }

        return true;
    }
}