function AjaxBasePageNegotiator::determineActiveTheme

Overrides ThemeNegotiatorInterface::determineActiveTheme

File

core/lib/Drupal/Core/Theme/AjaxBasePageNegotiator.php, line 75

Class

AjaxBasePageNegotiator

Defines a theme negotiator that deals with the active theme on ajax requests.

Namespace

Code

public function determineActiveTheme(RouteMatchInterface $route_match) {
    $ajax_page_state = $this->requestStack
        ->getCurrentRequest()
        ->get('ajax_page_state');
    $theme = $ajax_page_state['theme'];
    $token = $ajax_page_state['theme_token'];
    // Prevent a request forgery from giving a person access to a theme they
    // shouldn't be otherwise allowed to see. However, since everyone is
    // allowed to see the default theme, token validation isn't required for
    // that, and bypassing it allows most use-cases to work even when accessed
    // from the page cache.
    if ($theme === $this->configFactory
        ->get('system.theme')
        ->get('default') || $this->csrfGenerator
        ->validate($token, $theme)) {
        return $theme;
    }
}