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475dd60354
The initial office preview implementation converted an office document with LibreOffice to PDF, used ImageMagick to extract the first page as JPEG, and passed it OC_Image. https://github.com/nextcloud/server/pull/10198 changed the implementation to use PNG rather than PDF. OC_Image can use a PNG as a preview right away, so the ImageMagick step is unnecessary. The registration code was updated to not ask ImageMagick if PDF is supported, as PDFs are no longer used to create office document previews. Signed-off-by: Daniel Kesselberg <mail@danielkesselberg.de>
109 lines
2.9 KiB
PHP
109 lines
2.9 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Olivier Paroz <github@oparoz.com>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Robin McCorkell <robin@mccorkell.me.uk>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author Tor Lillqvist <tml@collabora.com>
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*
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC\Preview;
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use OCP\Files\File;
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use OCP\Files\FileInfo;
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use OCP\IImage;
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use OCP\ITempManager;
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use OCP\Server;
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abstract class Office extends ProviderV2 {
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/**
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* {@inheritDoc}
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*/
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public function isAvailable(FileInfo $file): bool {
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return is_string($this->options['officeBinary']);
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}
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/**
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* {@inheritDoc}
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*/
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public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
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if (!$this->isAvailable($file)) {
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return null;
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}
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$tempManager = Server::get(ITempManager::class);
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// The file to generate the preview for.
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$absPath = $this->getLocalFile($file);
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// The destination for the LibreOffice user profile.
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// LibreOffice can rune once per user profile and therefore instance id and file id are included.
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$profile = $tempManager->getTemporaryFolder(
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'nextcloud-office-profile-' . \OC_Util::getInstanceId() . '-' . $file->getId()
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);
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// The destination for the LibreOffice convert result.
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$outdir = $tempManager->getTemporaryFolder(
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'nextcloud-office-preview-' . \OC_Util::getInstanceId() . '-' . $file->getId()
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);
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if ($profile === false || $outdir === false) {
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$this->cleanTmpFiles();
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return null;
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}
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$parameters = [
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$this->options['officeBinary'],
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'-env:UserInstallation=file://' . escapeshellarg($profile),
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'--headless',
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'--nologo',
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'--nofirststartwizard',
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'--invisible',
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'--norestore',
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'--convert-to png',
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'--outdir ' . escapeshellarg($outdir),
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escapeshellarg($absPath),
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];
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$cmd = implode(' ', $parameters);
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exec($cmd, $output, $returnCode);
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if ($returnCode !== 0) {
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$this->cleanTmpFiles();
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return null;
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}
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$preview = $outdir . pathinfo($absPath, PATHINFO_FILENAME) . '.png';
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$image = new \OCP\Image();
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$image->loadFromFile($preview);
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$this->cleanTmpFiles();
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if ($image->valid()) {
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$image->scaleDownToFit($maxX, $maxY);
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return $image;
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}
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return null;
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}
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}
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