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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
* @author Joas Schilling <coding@schilljs.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Olivier Paroz <github@oparoz.com>
* @author Robin Appelman <robin@icewind.nl>
* @author Robin McCorkell <robin@mccorkell.me.uk>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Tor Lillqvist <tml@collabora.com>
*
* @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\Preview;
use OCP\Files\File;
use OCP\Files\FileInfo;
use OCP\IImage;
use OCP\ITempManager;
use OCP\Server;
abstract class Office extends ProviderV2 {
/**
* {@inheritDoc}
*/
public function isAvailable(FileInfo $file): bool {
return is_string($this->options['officeBinary']);
}
/**
* {@inheritDoc}
*/
public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
if (!$this->isAvailable($file)) {
return null;
}
$tempManager = Server::get(ITempManager::class);
// The file to generate the preview for.
$absPath = $this->getLocalFile($file);
// The destination for the LibreOffice user profile.
// LibreOffice can rune once per user profile and therefore instance id and file id are included.
$profile = $tempManager->getTemporaryFolder(
'nextcloud-office-profile-' . \OC_Util::getInstanceId() . '-' . $file->getId()
);
// The destination for the LibreOffice convert result.
$outdir = $tempManager->getTemporaryFolder(
'nextcloud-office-preview-' . \OC_Util::getInstanceId() . '-' . $file->getId()
);
if ($profile === false || $outdir === false) {
$this->cleanTmpFiles();
return null;
}
$parameters = [
$this->options['officeBinary'],
'-env:UserInstallation=file://' . escapeshellarg($profile),
'--headless',
'--nologo',
'--nofirststartwizard',
'--invisible',
'--norestore',
'--convert-to png',
'--outdir ' . escapeshellarg($outdir),
escapeshellarg($absPath),
];
$cmd = implode(' ', $parameters);
exec($cmd, $output, $returnCode);
if ($returnCode !== 0) {
$this->cleanTmpFiles();
return null;
}
$preview = $outdir . pathinfo($absPath, PATHINFO_FILENAME) . '.png';
$image = new \OCP\Image();
$image->loadFromFile($preview);
$this->cleanTmpFiles();
if ($image->valid()) {
$image->scaleDownToFit($maxX, $maxY);
return $image;
}
return null;
}
}
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