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ArtworkFetcher.php

<?php

use CoverArtArchive\CoverArt;
use Guzzle\Http\Client;
use MusicBrainz\Filters\RecordingFilter;
use MusicBrainz\HttpAdapters\GuzzleHttpAdapter;
use MusicBrainz\MusicBrainz;
use phpFastCache\CacheManager;
use Ramsey\Uuid\Uuid;

class ArtworkFetcher {
  /**
   *
   * @var ArtworkFetcher
   */
  private static $instance;

  public static function getInstance() {
    if (is_null(self::$instance)) {
      self::$instance = new self();
    }

    return self::$instance;
  }

  private $brainz;

  private $cache;

  private $expireAt;

  private function __construct() {
    $this->brainz = new MusicBrainz(new GuzzleHttpAdapter(new Client()));
    $this->brainz->setUserAgent("python-musicbrainz", "2.0", "http://coverart.codebucket.de");

    $this->cache = CacheManager::getInstance("predis", [
      'host' => '127.0.0.1',
      'fallback' => 'files',
      'path' => dirname(__FILE__) . '/cache'
    ]);

    $this->expireAt = new DateTime(date('Y-m-d H:i:s', strtotime('+1 month', time())));
  }

  public function getTrackId($track, $artist) {
    $uuid = Uuid::uuid3(Uuid::NAMESPACE_DNS, $track . ":" . $artist);
    $key = "track:" . $uuid->toString();

    // cache lookup
    if ($this->cache->hasItem($key)) {
      return $this->readCache($key);
    }

    $filter = array(
      "artist" => urlencode($artist),
      "recording" => urlencode($track)
    );

    $recordings = $this->brainz->search(new RecordingFilter($filter));
    $mbid = $recordings[0]->id;

    $this->writeCache($key, $mbid);
    return $mbid;
  }

  public function getCover($mbid) {
    $key = "cover:" . $mbid;

    // cache lookup
    if ($this->cache->hasItem($key)) {
      return $this->readCache($key);
    }

    $recordings = $this->brainz->lookup("recording", $mbid, array("releases"));
    $releases = $recordings['releases'];

    // remove unofficial releases without date
    foreach ($releases as $item => $release) {
    	if (!isset($release['date'])) {
    		unset($releases[$item]);
    	}
    }

    usort($releases, function($a, $b) {
    	return strtotime($a['date']) - strtotime($b['date']); // $y - $x to reverse direction
    });
    $release = $releases[0];

    $coverart = new CoverArt($release['id'], new Client());
    $cover = (array) $coverart->front;

    $this->writeCache($key, $cover);
    return $cover;
  }

  private function readCache($key) {
    $item = $this->cache->getItem($key);
    return $item->get();
  }

  private function writeCache($key, $value) {
    $item = $this->cache->getItem($key);
    $now = new DateTime(date('Y-m-d H:i:s', time()));
    $diff = $now->diff($this->expireAt);
    $item->set($value)->expiresAfter($diff);
    $this->cache->save($item);
  }
}