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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
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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