iframe_cookie_consent.module

<?php

/**
 * @file
 * Iframe cookie consent module which handles video field.
 */

/**
 * Implements hook_preprocess_field().
 */
function iframe_cookie_consent_preprocess_field(&$variables, $hook) {
  // Whitelist bundles.
  $whitelist = ['video', 'remote_video'];

  if (in_array($variables['element']['#bundle'], $whitelist)) {
    // Get cookie consent settings.
    $config = \Drupal::config('iframe_cookie_consent.settings');
    // Get cookie consent category.
    $consent_cat = $config->get('cookieconsent_category') ?? 'marketing';
    // YouTube regex pattern.
    $regex_pattern = "/(youtube.com|youtu.be)\/(embed)?(\?v=)?(\S+)?/";

    foreach ($variables['items'] as $key => $item) {
      // Check that content type is html_tag.
      if (isset($item['content']['#type']) && $item['content']['#type'] == 'html_tag') {
        $src = $item['content']['#attributes']['src'] ?? NULL;
        // Check if iframe has YouTube url.
        if (preg_match($regex_pattern, $src, $match)) {
          // Change src attribute to data-cookieblock-src.
          $variables['items'][$key]['content']['#attributes']['data-cookieblock-src'] = $src;
          unset($variables['items'][$key]['content']['#attributes']['src']);
          // Set cookieconsent category value.
          $variables['items'][$key]['content']['#attributes']['data-cookieconsent'] = $consent_cat;
          // Put optout & optin html string.
          $variables['items'][$key]['content']['#prefix'] = '<div class="cookieconsent-optin-' . $consent_cat . '">'
            . t('This content is only visible when the visitor has consented to marketing cookies.')
            . '</div>';
          $variables['items'][$key]['content']['#prefix'] .= '<div class="cookieconsent-optout-' . $consent_cat . '">'
            . t('Please <a href="javascript:Cookiebot.renew()">accept marketing-cookies</a> to watch this video.')
            . '</div>';
        }
      }
    }
  }
}