amp-8.x-3.5/modules/amp_rdf/amp_rdf.module

<?php

use Drupal\Core\Template\Attribute;

/**
* Implements hook_preprocess_html() for HTML document templates.
*/
function amp_rdf_preprocess_html(&$variables) {

  // 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'
  ];
}

/**
 * Implements hook_preprocess_node() for node templates.
 */
function amp_rdf_preprocess_node(&$variables) {
  $amp_context = \Drupal::service('router.amp_context');
  if (!$amp_context->isAmpRoute()) {
    return;
  }

  // Remove RDF properties incompatible with AMP specification.
  if (isset($variables['attributes']['about'])) {
    unset($variables['attributes']['about']);
  }
  if (isset($variables['attributes']['typeof'])) {
    unset($variables['attributes']['typeof']);
  }
  if (isset($variables['title_suffix']['rdf_meta_title'])) {
    unset($variables['title_suffix']['rdf_meta_title']);
  }
  if (isset($variables['metadata'])) {
    unset($variables['metadata']);
  }
  if (isset($variables['title_suffix']['rdf_meta_comment_count'])) {
    unset($variables['title_suffix']['rdf_meta_comment_count']);
  }
}

/**
 * Implements hook_preprocess_user() for user templates.
 */
function amp_rdf_preprocess_user(&$variables) {
  $amp_context = \Drupal::service('router.amp_context');
  if (!$amp_context->isAmpRoute()) {
    return;
  }

  // Remove RDF properties incompatible with AMP specification.
  if (isset($variables['attributes']['about'])) {
    unset($variables['attributes']['about']);
  }
  if (isset($variables['attributes']['typeof'])) {
    unset($variables['attributes']['typeof']);
  }
  if (isset($variables['#attached']['html_head']['rdf_user_username'])) {
    unset($variables['#attached']['html_head']['rdf_user_username']);
  }
}

/**
 * Implements hook_preprocess_username() for username templates.
 */
function amp_rdf_preprocess_username(&$variables) {
  $amp_context = \Drupal::service('router.amp_context');
  if (!$amp_context->isAmpRoute()) {
    return;
  }

  // Remove RDF properties incompatible with AMP specification.
  if (isset($variables['attributes']['about'])) {
    unset($variables['attributes']['about']);
  }
  if (isset($variables['attributes']['typeof'])) {
    unset($variables['attributes']['typeof']);
  }
  if (isset($variables['attributes']['property'])) {
    unset($variables['attributes']['property']);
  }
  if (isset($variables['attributes']['content'])) {
    unset($variables['attributes']['content']);
  }
  if (isset($variables['attributes']['datatype'])) {
    unset($variables['attributes']['datatype']);
  }
}

/**
 * Implements hook_preprocess_comment() for comment templates.
 */
function amp_rdf_preprocess_comment(&$variables) {
  $amp_context = \Drupal::service('router.amp_context');
  if (!$amp_context->isAmpRoute()) {
    return;
  }

  // Remove RDF properties incompatible with AMP specification.
  if (isset($variables['attributes']['about'])) {
    unset($variables['attributes']['about']);
  }
  if (isset($variables['attributes']['typeof'])) {
    unset($variables['attributes']['typeof']);
  }
  if (isset($variables['author']['#theme']['rdf_wrapper'])) {
    $variables['author'] = $variables['author']['#content'];
  }
  foreach ($variables['submitted'] as $key => $submitted) {
    if (isset($submitted['#theme']) && ($submitted['#theme'] == 'rdf_wrapper')) {
      $variables['submitted'][$key] = $variables['submitted'][$key]['#content'];
    }
  }
  if (isset($variables['title_attributes']['property'])) {
    unset($variables['title_attributes']['property']);
  }
  if (isset($variables['title_attributes']['datatype'])) {
    unset($variables['title_attributes']['datatype']);
  }
  if (isset($variables['rdf_metadata_attributes'])) {
    unset($variables['rdf_metadata_attributes']);
  }
  if (isset($variables['content']['comment_body']['#prefix'])) {
    unset($variables['content']['comment_body']['#prefix']);
  }
}

/**
 * Implements hook_preprocess_taxonomy_term() for taxonomy term templates.
 */
function amp_rdf_preprocess_taxonomy_term(&$variables) {
  $amp_context = \Drupal::service('router.amp_context');
  if (!$amp_context->isAmpRoute()) {
    return;
  }

  // Remove RDF properties incompatible with AMP specification.
  if (isset($variables['attributes']['about'])) {
    unset($variables['attributes']['about']);
  }
  if (isset($variables['attributes']['typeof'])) {
    unset($variables['attributes']['typeof']);
  }
  if (isset($variables['title_suffix']['taxonomy_term_rdfa'])) {
    unset($variables['title_suffix']['taxonomy_term_rdfa']);
  }
}

/**
 * Implements hook_preprocess_image() for image templates.
 */
function amp_rdf_preprocess_image(&$variables) {
  $amp_context = \Drupal::service('router.amp_context');
  if (!$amp_context->isAmpRoute()) {
    return;
  }

  // Remove RDF properties incompatible with AMP specification.
  if (isset($variables['attributes']['typeof'])) {
    unset($variables['attributes']['typeof']);
  }
}

/**
 * Implements hook_preprocess_rdf_metadata() for rdf metadata templates.
 */
function amp_rdf_preprocess_rdf_metadata(&$variables) {
  $amp_context = \Drupal::service('router.amp_context');
  if (!$amp_context->isAmpRoute()) {
    return;
  }

  // Remove RDF properties incompatible with AMP specification.
  foreach ($variables['metadata'] as $key => $attributes) {
    $variables['metadata'][$key] = new Attribute();
  }
}

/**
 * Implements hook_preprocess_field() for field templates.
 */
function amp_rdf_preprocess_field(&$variables) {
  $amp_context = \Drupal::service('router.amp_context');
  if (!$amp_context->isAmpRoute()) {
    return;
  }

  // Remove RDF properties incompatible with AMP specification.
  if (isset($variables['attributes']['rel'])) {
    unset($variables['attributes']['rel']);
  }

  if (isset($variables['attributes']['rev'])) {
    unset($variables['attributes']['rev']);
  }

  if (isset($variables['attributes']['property'])) {
    unset($variables['attributes']['property']);
  }

  if (isset($variables['attributes']['content'])) {
    unset($variables['attributes']['content']);
  }

  if (isset($variables['attributes']['datatype'])) {
    unset($variables['attributes']['datatype']);
  }
}