nextcloud/lib/private/Preview/BackgroundCleanupJob.php

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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2018, Roeland Jago Douma <roeland@famdouma.nl>
*
* @author Roeland Jago Douma <roeland@famdouma.nl>
*
* @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/>.
*
*/
namespace OC\Preview;
use OC\BackgroundJob\TimedJob;
use OC\Preview\Storage\Root;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\Files\IMimeTypeLoader;
use OCP\Files\NotFoundException;
use OCP\Files\NotPermittedException;
use OCP\IDBConnection;
class BackgroundCleanupJob extends TimedJob {
/** @var IDBConnection */
private $connection;
/** @var Root */
private $previewFolder;
/** @var bool */
private $isCLI;
/** @var IMimeTypeLoader */
private $mimeTypeLoader;
public function __construct(IDBConnection $connection,
Root $previewFolder,
IMimeTypeLoader $mimeTypeLoader,
bool $isCLI) {
// Run at most once an hour
$this->setInterval(3600);
$this->connection = $connection;
$this->previewFolder = $previewFolder;
$this->isCLI = $isCLI;
$this->mimeTypeLoader = $mimeTypeLoader;
}
public function run($argument) {
foreach ($this->getDeletedFiles() as $fileId) {
try {
$preview = $this->previewFolder->getFolder((string)$fileId);
$preview->delete();
} catch (NotFoundException $e) {
// continue
} catch (NotPermittedException $e) {
// continue
}
}
}
private function getDeletedFiles(): \Iterator {
yield from $this->getOldPreviewLocations();
yield from $this->getNewPreviewLocations();
}
private function getOldPreviewLocations(): \Iterator {
$qb = $this->connection->getQueryBuilder();
$qb->select('a.name')
->from('filecache', 'a')
->leftJoin('a', 'filecache', 'b', $qb->expr()->eq(
$qb->expr()->castColumn('a.name', IQueryBuilder::PARAM_INT), 'b.fileid'
))
->where(
$qb->expr()->isNull('b.fileid')
)->andWhere(
$qb->expr()->eq('a.parent', $qb->createNamedParameter($this->previewFolder->getId()))
)->andWhere(
$qb->expr()->like('a.name', $qb->createNamedParameter('__%'))
);
if (!$this->isCLI) {
$qb->setMaxResults(10);
}
$cursor = $qb->execute();
while ($row = $cursor->fetch()) {
yield $row['name'];
}
$cursor->closeCursor();
}
private function getNewPreviewLocations(): \Iterator {
$qb = $this->connection->getQueryBuilder();
$qb->select('path', 'mimetype')
->from('filecache')
->where($qb->expr()->eq('fileid', $qb->createNamedParameter($this->previewFolder->getId())));
$cursor = $qb->execute();
$data = $cursor->fetch();
$cursor->closeCursor();
if ($data === null) {
return [];
}
/*
* This lovely like is the result of the way the new previews are stored
* We take the md5 of the name (fileid) and split the first 7 chars. That way
* there are not a gazillion files in the root of the preview appdata.
*/
$like = $this->connection->escapeLikeParameter($data['path']) . '/_/_/_/_/_/_/_/%';
$qb = $this->connection->getQueryBuilder();
$qb->select('a.name')
->from('filecache', 'a')
->leftJoin('a', 'filecache', 'b', $qb->expr()->eq(
$qb->expr()->castColumn('a.name', IQueryBuilder::PARAM_INT), 'b.fileid'
))
->where(
$qb->expr()->andX(
$qb->expr()->isNull('b.fileid'),
$qb->expr()->like('a.path', $qb->createNamedParameter($like)),
$qb->expr()->eq('a.mimetype', $qb->createNamedParameter($this->mimeTypeLoader->getId('httpd/unix-directory')))
)
);
if (!$this->isCLI) {
$qb->setMaxResults(10);
}
$cursor = $qb->execute();
while ($row = $cursor->fetch()) {
yield $row['name'];
}
$cursor->closeCursor();
}
}