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- <?php
- /**
- * @file
- * Adds BigPipe no-JS detection.
- */
- use Drupal\big_pipe\Render\Placeholder\BigPipeStrategy;
- use Drupal\Core\Routing\RouteMatchInterface;
- use Drupal\Core\Url;
- /**
- * Implements hook_help().
- */
- function big_pipe_help($route_name, RouteMatchInterface $route_match) {
- switch ($route_name) {
- case 'help.page.big_pipe':
- $output = '<h3>' . t('About') . '</h3>';
- $output .= '<p>' . t('The BigPipe module sends pages with dynamic content in a way that allows browsers to show them much faster. For more information, see the <a href=":big_pipe-documentation">online documentation for the BigPipe module</a>.', [':big_pipe-documentation' => 'https://www.drupal.org/documentation/modules/big_pipe']) . '</p>';
- $output .= '<h3>' . t('Uses') . '</h3>';
- $output .= '<dl>';
- $output .= '<dt>' . t('Speeding up your site') . '</dt>';
- $output .= '<dd>' . t('The module requires no configuration. Every part of the page contains metadata that allows BigPipe to figure this out on its own.') . '</dd>';
- $output .= '</dl>';
- return $output;
- }
- }
- /**
- * Implements hook_page_attachments().
- *
- * @see \Drupal\big_pipe\Controller\BigPipeController::setNoJsCookie()
- */
- function big_pipe_page_attachments(array &$page) {
- // Routes that don't use BigPipe also don't need no-JS detection.
- if (\Drupal::routeMatch()->getRouteObject()->getOption('_no_big_pipe')) {
- return;
- }
- $request = \Drupal::request();
- // BigPipe is only used when there is an actual session, so only add the no-JS
- // detection when there actually is a session.
- // @see \Drupal\big_pipe\Render\Placeholder\BigPipeStrategy.
- $session_exists = \Drupal::service('session_configuration')->hasSession($request);
- $page['#cache']['contexts'][] = 'session.exists';
- // Only do the no-JS detection while we don't know if there's no JS support:
- // avoid endless redirect loops.
- $has_big_pipe_nojs_cookie = $request->cookies->has(BigPipeStrategy::NOJS_COOKIE);
- $page['#cache']['contexts'][] = 'cookies:' . BigPipeStrategy::NOJS_COOKIE;
- if ($session_exists) {
- if (!$has_big_pipe_nojs_cookie) {
- // Let server set the BigPipe no-JS cookie.
- $page['#attached']['html_head'][] = [
- [
- // Redirect through a 'Refresh' meta tag if JavaScript is disabled.
- '#tag' => 'meta',
- '#noscript' => TRUE,
- '#attributes' => [
- 'http-equiv' => 'Refresh',
- 'content' => '0; URL=' . Url::fromRoute('big_pipe.nojs', [], ['query' => \Drupal::service('redirect.destination')->getAsArray()])->toString(),
- ],
- ],
- 'big_pipe_detect_nojs',
- ];
- }
- else {
- // Let client delete the BigPipe no-JS cookie.
- $page['#attached']['html_head'][] = [
- [
- '#tag' => 'script',
- '#value' => 'document.cookie = "' . BigPipeStrategy::NOJS_COOKIE . '=1; path=/; expires=Thu, 01 Jan 1970 00:00:00 GMT"',
- ],
- 'big_pipe_detect_js',
- ];
- }
- }
- }
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