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Add abstract class to extract previews from files that are zip archives 

Signed-off-by: Julius Härtl <jus@bitgrid.net>
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Julius Härtl 2020-04-05 10:59:55 +02:00
parent 981278a666
commit 0734582c06
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lib/private/Preview/Bundled.php Normal file
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<?php
/**
* @copyright Copyright (c) 2020 Julius Härtl <jus@bitgrid.net>
*
* @author Julius Härtl <jus@bitgrid.net>
*
* @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 OCP\Files\File;
use OCP\Files\NotPermittedException;
use OCP\IImage;
use OCP\Lock\LockedException;
/**
* Extracts a preview from files that embed them in an ZIP archive
*/
abstract class Bundled extends ProviderV2 {
protected function extractThumbnail(File $file, $path): ?IImage {
$sourceTmp = \OC::$server->getTempManager()->getTemporaryFile();
$targetTmp = \OC::$server->getTempManager()->getTemporaryFile();
try {
$content = $file->fopen('r');
$content = stream_get_contents($content);
file_put_contents($sourceTmp, $content);
$zip = new \OC\Archive\ZIP($sourceTmp);
$zip->extractFile($path, $targetTmp);
$image = new \OC_Image();
$image->loadFromFile($targetTmp);
$image->fixOrientation();
return $image;
} catch (\Exception $e) {
return null;
}
}
}