function RouteProcessorCsrf::processOutbound

Overrides OutboundRouteProcessorInterface::processOutbound

File

core/lib/Drupal/Core/Access/RouteProcessorCsrf.php, line 36

Class

RouteProcessorCsrf

Processes the outbound route to handle the CSRF token.

Namespace

Code

public function processOutbound($route_name, Route $route, array &$parameters, BubbleableMetadata $bubbleable_metadata = NULL) {
    if ($route->hasRequirement('_csrf_token')) {
        $path = ltrim($route->getPath(), '/');
        // Replace the path parameters with values from the parameters array.
        foreach ($parameters as $param => $value) {
            $path = str_replace("{{$param}}", $value, $path);
        }
        // Adding this to the parameters means it will get merged into the query
        // string when the route is compiled.
        if (!$bubbleable_metadata) {
            $parameters['token'] = $this->csrfToken
                ->get($path);
        }
        else {
            // Generate a placeholder and a render array to replace it.
            $placeholder = Crypt::hashBase64($path);
            $placeholder_render_array = [
                '#lazy_builder' => [
                    'route_processor_csrf:renderPlaceholderCsrfToken',
                    [
                        $path,
                    ],
                ],
            ];
            // Instead of setting an actual CSRF token as the query string, we set
            // the placeholder, which will be replaced at the very last moment. This
            // ensures links with CSRF tokens don't break cacheability.
            $parameters['token'] = $placeholder;
            $bubbleable_metadata->addAttachments([
                'placeholders' => [
                    $placeholder => $placeholder_render_array,
                ],
            ]);
        }
    }
}