protected function HtmlLinkExtractor::extractUrlFromField in Link checker 8

Extracts a URLs from field.

Return value

array Array of URLs.

Overrides LinkExtractorBase::extractUrlFromField

File

src/Plugin/LinkExtractor/HtmlLinkExtractor.php, line 26

Class

HtmlLinkExtractor

Class HtmlLinkExtractor.

Namespace

Drupal\linkchecker\Plugin\LinkExtractor

Code

protected function extractUrlFromField(array $value) {
  $string = $value['value'];
  if (empty($string)) {
    return [];
  }
  $html_dom = Html::load($string);
  $urls = [];

  // Finds all hyperlinks in the content.
  if ($this->linkcheckerSetting
    ->get('extract.from_a') == TRUE) {
    $links = $html_dom
      ->getElementsByTagName('a');
    foreach ($links as $link) {
      $urls[] = $link
        ->getAttribute('href');
    }
    $links = $html_dom
      ->getElementsByTagName('area');
    foreach ($links as $link) {
      $urls[] = $link
        ->getAttribute('href');
    }
  }

  // Finds all audio links in the content.
  if ($this->linkcheckerSetting
    ->get('extract.from_audio') == TRUE) {
    $audios = $html_dom
      ->getElementsByTagName('audio');
    foreach ($audios as $audio) {
      $urls[] = $audio
        ->getAttribute('src');

      // Finds source tags with links in the audio tag.
      $sources = $audio
        ->getElementsByTagName('source');
      foreach ($sources as $source) {
        $urls[] = $source
          ->getAttribute('src');
      }

      // Finds track tags with links in the audio tag.
      $tracks = $audio
        ->getElementsByTagName('track');
      foreach ($tracks as $track) {
        $urls[] = $track
          ->getAttribute('src');
      }
    }
  }

  // Finds embed tags with links in the content.
  if ($this->linkcheckerSetting
    ->get('extract.from_embed') == TRUE) {
    $embeds = $html_dom
      ->getElementsByTagName('embed');
    foreach ($embeds as $embed) {
      $urls[] = $embed
        ->getAttribute('src');
      $urls[] = $embed
        ->getAttribute('pluginurl');
      $urls[] = $embed
        ->getAttribute('pluginspage');
    }
  }

  // Finds iframe tags with links in the content.
  if ($this->linkcheckerSetting
    ->get('extract.from_iframe') == TRUE) {
    $iframes = $html_dom
      ->getElementsByTagName('iframe');
    foreach ($iframes as $iframe) {
      $urls[] = $iframe
        ->getAttribute('src');
    }
  }

  // Finds img tags with links in the content.
  if ($this->linkcheckerSetting
    ->get('extract.from_img') == TRUE) {
    $imgs = $html_dom
      ->getElementsByTagName('img');
    foreach ($imgs as $img) {
      $urls[] = $img
        ->getAttribute('src');
      $urls[] = $img
        ->getAttribute('longdesc');
    }
  }

  // Finds object/param tags with links in the content.
  if ($this->linkcheckerSetting
    ->get('extract.from_object') == TRUE) {
    $objects = $html_dom
      ->getElementsByTagName('object');
    foreach ($objects as $object) {
      $urls[] = $object
        ->getAttribute('data');
      $urls[] = $object
        ->getAttribute('codebase');

      // Finds param tags with links in the object tag.
      $params = $object
        ->getElementsByTagName('param');
      foreach ($params as $param) {

        // @todo
        // - Try to extract links in unkown "flashvars" values
        //   (e.g., file=http://, data=http://).
        $names = [
          'archive',
          'filename',
          'href',
          'movie',
          'src',
          'url',
        ];
        if ($param
          ->hasAttribute('name') && in_array($param
          ->getAttribute('name'), $names)) {
          $urls[] = $param
            ->getAttribute('value');
        }
        $srcs = [
          'movie',
        ];
        if ($param
          ->hasAttribute('src') && in_array($param
          ->getAttribute('src'), $srcs)) {
          $urls[] = $param
            ->getAttribute('value');
        }
      }
    }
  }

  // Finds video tags with links in the content.
  if ($this->linkcheckerSetting
    ->get('extract.from_video') == TRUE) {
    $videos = $html_dom
      ->getElementsByTagName('video');
    foreach ($videos as $video) {
      $urls[] = $video
        ->getAttribute('poster');
      $urls[] = $video
        ->getAttribute('src');

      // Finds source tags with links in the video tag.
      $sources = $video
        ->getElementsByTagName('source');
      foreach ($sources as $source) {
        $urls[] = $source
          ->getAttribute('src');
      }

      // Finds track tags with links in the audio tag.
      $tracks = $video
        ->getElementsByTagName('track');
      foreach ($tracks as $track) {
        $urls[] = $track
          ->getAttribute('src');
      }
    }
  }

  // Remove empty values.
  $urls = array_filter($urls);

  // Remove duplicate urls.
  $urls = array_unique($urls);
  return $urls;
}