Chris@0: <?php
Chris@0: 
Chris@0: /**
Chris@0:  * @file
Chris@0:  * Adds BigPipe no-JS detection.
Chris@0:  */
Chris@0: 
Chris@0: use Drupal\big_pipe\Render\Placeholder\BigPipeStrategy;
Chris@0: use Drupal\Core\Routing\RouteMatchInterface;
Chris@0: use Drupal\Core\Url;
Chris@0: 
Chris@0: /**
Chris@0:  * Implements hook_help().
Chris@0:  */
Chris@0: function big_pipe_help($route_name, RouteMatchInterface $route_match) {
Chris@0:   switch ($route_name) {
Chris@0:     case 'help.page.big_pipe':
Chris@0:       $output = '<h3>' . t('About') . '</h3>';
Chris@0:       $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>';
Chris@0:       $output .= '<h3>' . t('Uses') . '</h3>';
Chris@0:       $output .= '<dl>';
Chris@0:       $output .= '<dt>' . t('Speeding up your site') . '</dt>';
Chris@0:       $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>';
Chris@0:       $output .= '</dl>';
Chris@0: 
Chris@0:       return $output;
Chris@0:   }
Chris@0: }
Chris@0: 
Chris@0: /**
Chris@0:  * Implements hook_page_attachments().
Chris@0:  *
Chris@0:  * @see \Drupal\big_pipe\Controller\BigPipeController::setNoJsCookie()
Chris@0:  */
Chris@0: function big_pipe_page_attachments(array &$page) {
Chris@0:   // Routes that don't use BigPipe also don't need no-JS detection.
Chris@0:   if (\Drupal::routeMatch()->getRouteObject()->getOption('_no_big_pipe')) {
Chris@0:     return;
Chris@0:   }
Chris@0: 
Chris@0:   $request = \Drupal::request();
Chris@0:   // BigPipe is only used when there is an actual session, so only add the no-JS
Chris@0:   // detection when there actually is a session.
Chris@0:   // @see \Drupal\big_pipe\Render\Placeholder\BigPipeStrategy.
Chris@0:   $session_exists = \Drupal::service('session_configuration')->hasSession($request);
Chris@0:   $page['#cache']['contexts'][] = 'session.exists';
Chris@0:   // Only do the no-JS detection while we don't know if there's no JS support:
Chris@0:   // avoid endless redirect loops.
Chris@0:   $has_big_pipe_nojs_cookie = $request->cookies->has(BigPipeStrategy::NOJS_COOKIE);
Chris@0:   $page['#cache']['contexts'][] = 'cookies:' . BigPipeStrategy::NOJS_COOKIE;
Chris@0:   if ($session_exists) {
Chris@0:     if (!$has_big_pipe_nojs_cookie) {
Chris@0:       // Let server set the BigPipe no-JS cookie.
Chris@0:       $page['#attached']['html_head'][] = [
Chris@0:         [
Chris@0:           // Redirect through a 'Refresh' meta tag if JavaScript is disabled.
Chris@0:           '#tag' => 'meta',
Chris@0:           '#noscript' => TRUE,
Chris@0:           '#attributes' => [
Chris@0:             'http-equiv' => 'Refresh',
Chris@0:             'content' => '0; URL=' . Url::fromRoute('big_pipe.nojs', [], ['query' => \Drupal::service('redirect.destination')->getAsArray()])->toString(),
Chris@0:           ],
Chris@0:         ],
Chris@0:         'big_pipe_detect_nojs',
Chris@0:       ];
Chris@0:     }
Chris@0:     else {
Chris@0:       // Let client delete the BigPipe no-JS cookie.
Chris@0:       $page['#attached']['html_head'][] = [
Chris@0:         [
Chris@0:           '#tag' => 'script',
Chris@0:           '#value' => 'document.cookie = "' . BigPipeStrategy::NOJS_COOKIE . '=1; path=/; expires=Thu, 01 Jan 1970 00:00:00 GMT"',
Chris@0:         ],
Chris@0:         'big_pipe_detect_js',
Chris@0:       ];
Chris@0:     }
Chris@0:   }
Chris@0: }