--- /dev/null
+<?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',
+ ];
+ }
+ }
+}