function amp_preprocess_html in Accelerated Mobile Pages (AMP) 8.3

Implements hook_preprocess_html().

File

./amp.module, line 35

Provides functionality for handling AMP.

Code

function amp_preprocess_html(&$variables) {
  $amp_context = \Drupal::service('router.amp_context');
  if ($amp_context
    ->isAmpRoute()) {
    foreach ($variables['page']['#attached']['html_head'] as $key => $value) {
      if ($value[1] === 'viewport') {
        $value[0]['#attributes']['content'] = 'width=device-width,minimum-scale=1,initial-scale=1';
        $variables['page']['#attached']['html_head'][$key] = $value;
      }

      // Remove Big Pipe's meta tag, which is invalid AMP markup.
      // We are generating placeholders on the server so should not be needed.
      if ($key == 'big_pipe_detect_nojs') {
        unset($variables['page']['#attached']['html_head'][$key]);
      }
    }

    // Remove RDF and Metatag properties incompatible with AMP specification.
    $attribute_list = [
      'prefix',
      'xmlns:dc',
      'xmlns:og',
      'xmlns:article',
      'xmlns:book',
      'xmlns:product',
      'xmlns:profile',
      'xmlns:video',
      'itemtype',
      'itemscope',
    ];
    if (isset($variables['html_attributes'])) {
      foreach ($attribute_list as $attribute_item) {
        if (isset($variables['html_attributes'][$attribute_item])) {
          unset($variables['html_attributes'][$attribute_item]);
        }
      }
    }
  }
}