nextcloud/lib/private/preview/svg.php

<?php
/**
 * @author Georg Ehrke <georg@owncloud.com>
 * @author Georg Ehrke <georg@ownCloud.com>
 * @author Joas Schilling <nickvergessen@gmx.de>
 *
 * @copyright Copyright (c) 2015, ownCloud, Inc.
 * @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;

class SVG extends Provider {
	/**
	 * {@inheritDoc}
	 */
	public function getMimeType() {
		return '/image\/svg\+xml/';
	}

	/**
	 * {@inheritDoc}
	 */
	public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
		try{
			$svg = new \Imagick();
			$svg->setBackgroundColor(new \ImagickPixel('transparent'));

			$content = stream_get_contents($fileview->fopen($path, 'r'));
			if(substr($content, 0, 5) !== '<?xml') {
				$content = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>' . $content;
			}

			// Do not parse SVG files with references
			if(stripos($content, 'xlink:href') !== false) {
				return false;
			}

			$svg->readImageBlob($content);
			$svg->setImageFormat('png32');
		} catch (\Exception $e) {
			\OC_Log::write('core', $e->getmessage(), \OC_Log::ERROR);
			return false;
		}

		//new image object
		$image = new \OC_Image();
		$image->loadFromData($svg);
		//check if image object is valid
		return $image->valid() ? $image : false;
	}
}