function big_pipe_page_attachments

Implements hook_page_attachments().

See also

\Drupal\big_pipe\Controller\BigPipeController::setNoJsCookie()

File

core/modules/big_pipe/big_pipe.module, line 35

Code

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',
            ];
        }
    }
}