feat: maintenance mode indicator for whitelisted ips

src/Twig/AppExtension.php

@@ -31,6 +31,7 @@ class AppExtension extends AbstractExtension
         return [
             new TwigFunction('icon', [AppRuntime::class, 'renderIcon'], ['needs_environment' => true, 'is_safe' => ['html']]),
             new TwigFunction('is_current_route', [AppRuntime::class, 'isCurrentRoute']),
+            new TwigFunction('is_maintenance_mode', [AppRuntime::class, 'isMaintenanceMode']),
             new TwigFunction('return_url', [AppRuntime::class, 'getEncodedReturnUrl']),
             new TwigFunction('forwarded_return_url', [AppRuntime::class, 'getForwardedReturnUrl']),
             new TwigFunction('qa_attribute', [AppRuntime::class, 'renderQaAttribute'], ['is_safe' => ['html']]),

src/Twig/AppRuntime.php

@@ -180,6 +180,14 @@ class AppRuntime implements RuntimeExtensionInterface
         return $requestedRoute === $route;
     }
 
+    /**
+     * The attribute is set by MaintenanceModeListener, on the ip whitelist branch only.
+     */
+    public function isMaintenanceMode(): bool
+    {
+        return true === $this->requestStack->getMainRequest()?->attributes->get('_maintenance_mode_allowed');
+    }
+
     public function getEncodedReturnUrl(): string
     {
         $masterRequest = $this->requestStack->getMainRequest();