Club Drupal

<?php

/**

 * @file

 * Extends the MediaInternetBaseHandler class to handle YouTube videos.

 */

/**

 * Implementation of MediaInternetBaseHandler.

 *

 * @see hook_media_internet_providers().

 */

class MediaInternetYouTubeHandler extends MediaInternetBaseHandler {

  public function parse($embedCode) {

    $list_patterns = array(

      '@youtube\.com/playlist[#\?].*?list=([^"\& ]+)@i',

      '@youtube\.com/view_play_list[#\?].*?p=([^"\& ]+)@i',

    );

    foreach ($list_patterns as $pattern) {

      preg_match($pattern, $embedCode, $matches);

      if (isset($matches[1]) && $this->validId($matches[1], 'l')) {

        return file_stream_wrapper_uri_normalize('youtube://l/' . $matches[1]);

      }

    }

    // http://youtube.com/watch/*

    // http://youtube.com/embed/*

    // http://youtube.com/v/*

    // http://youtube.com/?v=*

    // http://youtu.be/*

    // http://gdata.youtube.com/feeds/api/videos/*

    $patterns = array(

      '@youtube\.com/watch[#\?].*?v=([^"\& ]+).*&list=([^"\& ]+)@i',

      '@youtu\.be/([^"\&\? ]+)\?list=([^"\& ]+)@i',

      '@youtube\.com/embed/([^"\&\? ]+)\?list=([^"\& ]+)@i',

      '@youtube\.com/watch[#\?].*?v=([^"\& ]+)@i',

      '@youtube\.com/embed/([^"\&\? ]+)@i',

      '@youtube\.com/v/([^"\&\? ]+)@i',

      '@youtube\.com/\?v=([^"\& ]+)@i',

      '@youtu\.be/([^"\&\? ]+)@i',

      '@gdata\.youtube\.com/feeds/api/videos/([^"\&\? ]+)@i',

    );

    foreach ($patterns as $pattern) {

      preg_match_all($pattern, $embedCode, $matches);

      // @TODO: Parse is called often. Refactor so that valid ID is checked

      // when a video is added, but not every time the embedCode is parsed.

      if (isset($matches[1][0]) && $this->validId($matches[1][0])) {

        $uri = 'youtube://v/' . $matches[1][0];

        if (isset($matches[2][0]) && $this->validId($matches[2][0], 'l')) {

          $uri .= '/l/' . $matches[2][0];

         }

        return file_stream_wrapper_uri_normalize($uri);

      }

    }

  }

  public function claim($embedCode) {

    if ($this->parse($embedCode)) {

      return TRUE;

    }

  }

  public function getFileObject() {

    $uri = $this->parse($this->embedCode);

    $file = file_uri_to_object($uri, TRUE);

    // Try to default the file name to the video's title.

    if (empty($file->fid) && $info = $this->getOEmbed()) {

      $file->filename = truncate_utf8($info['title'], 255);

    }

    return $file;

  }

  /**

   * Returns information about the media.

   *

   * See http://www.oembed.com.

   *

   * @return

   *   If oEmbed information is available, an array containing 'title', 'type',

   *   'url', and other information as specified by the oEmbed standard.

   *   Otherwise, NULL.

   */

  public function getOEmbed() {

    $uri = $this->parse($this->embedCode);

    $external_url = file_create_url($uri);

    $oembed_url = url('http://www.youtube.com/oembed', array('query' => array('url' => $external_url, 'format' => 'json')));

    $response = drupal_http_request($oembed_url);

    if (!isset($response->error)) {

      return drupal_json_decode($response->data);

    }

    else {

      throw new Exception("Error Processing Request. (Error: {$response->code}, {$response->error})");

      return;

    }

  }

  /**

   * Check if a YouTube video ID is valid.

   *

   * @return boolean

   *   TRUE if the video ID is valid, or throws a

   *   MediaInternetValidationException otherwise.

   */

  public function validId($id, $type = 'v') {

    $uri = file_stream_wrapper_uri_normalize('youtube://' . $type . '/' . check_plain($id));

    $external_url = file_create_url($uri);

    $oembed_url = url('http://www.youtube.com/oembed', array('query' => array('url' => $external_url, 'format' => 'json')));

    $response = drupal_http_request($oembed_url, array('method' => 'HEAD'));

    if ($response->code == 401) {

      throw new MediaInternetValidationException('Embedding has been disabled for this YouTube video.');

    }

    elseif ($response->code != 200) {

      throw new MediaInternetValidationException('The YouTube video ID is invalid or the video was deleted.');

    }

    return TRUE;

  }

}