owncloud/core

<?php
/**
 * @author Georg Ehrke <georg@owncloud.com>
 * @author Hendrik Leppelsack <hendrik@leppelsack.de>
 * @author Joas Schilling <coding@schilljs.com>
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Olivier Paroz <github@oparoz.com>
 * @author Thomas Tanghus <thomas@tanghus.net>
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @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 ID3Parser\ID3Parser;
use OCP\Files\File;
use OCP\Files\FileInfo;
use OCP\Preview\IProvider2;

class MP3 implements IProvider2 {
    /**
     * {@inheritDoc}
     */
    public function getMimeType() {
        return '/audio\/mpeg/';
    }

    /**
     * {@inheritDoc}
     */
    public function getThumbnail(File $file, $maxX, $maxY, $scalingUp) {
        $useFileDirectly = (!$file->isEncrypted() && !$file->isMounted());
        if ($useFileDirectly) {
            $absPath = $file->getStorage()->getLocalFile($file->getInternalPath());
        } else {
            $absPath = \OC::$server->getTempManager()->getTemporaryFile();

            $handle = $file->fopen('rb');
            \file_put_contents($absPath, $handle);
            \fclose($handle);
        }

        $getID3 = new ID3Parser();
        $tags = $getID3->analyze($absPath);

        $picture = isset($tags['id3v2']['APIC'][0]['data']) ? $tags['id3v2']['APIC'][0]['data'] : null;
        if ($picture === null && isset($tags['id3v2']['PIC'][0]['data'])) {
            $picture = $tags['id3v2']['PIC'][0]['data'];
        }

        if ($picture !== null) {
            $image = new \OC_Image();
            $image->loadFromData($picture);

            if ($image->valid()) {
                $image->scaleDownToFit($maxX, $maxY);

                return $image;
            }
        }

        return $this->getNoCoverThumbnail();
    }

    /**
     * Generates a default image when the file has no cover
     *
     * @return bool|\OCP\IImage false if the default image is missing or invalid
     */
    private function getNoCoverThumbnail() {
        $icon = \OC::$SERVERROOT . '/core/img/filetypes/audio.svg';

        if (!\file_exists($icon)) {
            return false;
        }

        $stream = \fopen($icon, 'r');
        $image = new \OC_Image();
        $image->loadFromFileHandle($stream);
        \fclose($stream);
        return $image->valid() ? $image : false;
    }

    /**
     * @inheritdoc
     */
    public function isAvailable(FileInfo $file) {
        return true;
    }
}