feat: domain-based theme-detection

src/Controller/Booking/Create/IndexController.php

@@ -103,9 +103,6 @@ class IndexController extends AbstractController
             // Store optional return URL in session (defaults to main EP site)
             $this->bookingService->storeReturnUrl($request, $params->returnUrl);
 
-            // Store theme for consistent styling throughout the booking flow
-            $this->bookingService->storeTheme($request, $params->theme);
-
             // Create fresh booking session with the provided parameters
             $bookingDto = $this->bookingService->startFreshBooking($request, $dateId, $hotelId, $agencyId);
 

src/EventListener/DomainThemeListener.php

@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\EventListener;
+
+use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+#[AsEventListener(event: KernelEvents::REQUEST, priority: 200)]
+class DomainThemeListener
+{
+    public const THEME_ATTRIBUTE = '_theme';
+    private const DEFAULT_THEME = 'base';
+
+    /**
+     * @param array<string, string> $domainThemeMap
+     */
+    public function __construct(
+        private readonly array $domainThemeMap,
+    ) {
+    }
+
+    public function __invoke(RequestEvent $event): void
+    {
+        if (false === $event->isMainRequest()) {
+            return;
+        }
+
+        $request = $event->getRequest();
+        $host = $request->getHost();
+
+        $theme = $this->resolveTheme($host);
+        $request->attributes->set(self::THEME_ATTRIBUTE, $theme);
+    }
+
+    private function resolveTheme(string $host): string
+    {
+        $host = strtolower($host);
+
+        foreach ($this->domainThemeMap as $pattern => $theme) {
+            $pattern = strtolower($pattern);
+
+            if ($host === $pattern || str_ends_with($host, '.' . $pattern)) {
+                return $theme;
+            }
+        }
+
+        return self::DEFAULT_THEME;
+    }
+}

src/Model/BookingQueryParams.php

@@ -21,7 +21,6 @@ readonly class BookingQueryParams
         public int $hotelId,
 
         public ?string $agency = null,
-        public string $theme = 'base',
 
         #[SerializedName('r')]
         public ?string $returnUrl = null,

src/Service/BookingService.php

@@ -22,8 +22,6 @@ class BookingService
     public const BOOKING_EDIT_KEY = 'booking_edit';
     public const RETURN_URL_KEY = 'booking_return_url';
     public const DEFAULT_RETURN_URL = 'https://www.ep-reisen.de';
-    public const THEME_KEY = 'booking_theme';
-    public const DEFAULT_THEME = 'base';
 
     public function __construct(
         private readonly TravelDataService $travelDataService,
@@ -195,33 +193,6 @@ class BookingService
         return $request->getSession()->get(self::RETURN_URL_KEY, self::DEFAULT_RETURN_URL);
     }
 
-    /**
-     * Stores the theme identifier in the session.
-     *
-     * Sanitizes the theme value to allow only alphanumeric characters and hyphens.
-     * Falls back to the default theme if empty or invalid.
-     */
-    public function storeTheme(Request $request, string $theme): void
-    {
-        $sanitized = preg_replace('/[^a-zA-Z0-9-]/', '', $theme);
-
-        if ('' === $sanitized) {
-            $sanitized = self::DEFAULT_THEME;
-        }
-
-        $request->getSession()->set(self::THEME_KEY, $sanitized);
-    }
-
-    /**
-     * Retrieves the theme identifier from the session.
-     *
-     * Returns the default theme if not set in session.
-     */
-    public function getTheme(Request $request): string
-    {
-        return $request->getSession()->get(self::THEME_KEY, self::DEFAULT_THEME);
-    }
-
     /**
      * Creates a fresh booking session with the provided travel parameters.
      *

src/Twig/AppRuntime.php

@@ -5,10 +5,10 @@ declare(strict_types=1);
 namespace App\Twig;
 
 use App\BusProNet\DataProvider\CountryDataProvider;
+use App\EventListener\DomainThemeListener;
 use App\Form\Model\BookingDto;
 use App\Form\Service\CreateFieldStateProvider;
 use App\Form\Service\EditFieldStateProvider;
-use App\Service\BookingService;
 use App\Service\ParticipantEligibilityService;
 use Symfony\Component\Form\FormView;
 use Symfony\Component\HttpFoundation\RequestStack;
@@ -228,18 +228,20 @@ class AppRuntime implements RuntimeExtensionInterface
     }
 
     /**
-     * Returns the current booking theme from session.
+     * Returns the current booking theme from request attribute.
      *
+     * The theme is resolved by DomainThemeListener based on the request host.
      * Defaults to 'base' if no theme is set.
      */
     public function getBookingTheme(): string
     {
         $request = $this->requestStack->getCurrentRequest();
+
         if (null === $request) {
-            return BookingService::DEFAULT_THEME;
+            return 'base';
         }
 
-        return $request->getSession()->get(BookingService::THEME_KEY, BookingService::DEFAULT_THEME);
+        return $request->attributes->get(DomainThemeListener::THEME_ATTRIBUTE, 'base');
     }
 
     /**