fix: update start method

Do not use a redirect response or else some informations are lost.

src/Security/CasAuthenticator.php

@@ -17,12 +17,12 @@
 use EcPhp\CasLib\Utils\Uri;
 use InvalidArgumentException;
 use Psr\Http\Message\ServerRequestInterface;
+use Symfony\Bridge\PsrHttpMessage\HttpFoundationFactoryInterface;
 use Symfony\Bridge\PsrHttpMessage\HttpMessageFactoryInterface;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\User\UserInterface;
@@ -36,22 +36,22 @@ final class CasAuthenticator extends AbstractAuthenticator implements Authentica
 {
     private CasInterface $cas;
 
-    private HttpMessageFactoryInterface $httpMessageFactory;
+    private HttpFoundationFactoryInterface $httpFoundationFactory;
 
-    private UrlGeneratorInterface $urlGenerator;
+    private HttpMessageFactoryInterface $httpMessageFactory;
 
     private CasUserProviderInterface $userProvider;
 
     public function __construct(
         CasInterface $cas,
         HttpMessageFactoryInterface $httpMessageFactory,
+        HttpFoundationFactoryInterface $httpFoundationFactory,
         CasUserProviderInterface $userProvider,
-        UrlGeneratorInterface $urlGenerator
     ) {
         $this->cas = $cas;
+        $this->httpFoundationFactory = $httpFoundationFactory;
         $this->httpMessageFactory = $httpMessageFactory;
         $this->userProvider = $userProvider;
-        $this->urlGenerator = $urlGenerator;
     }
 
     public function authenticate(Request $request): Passport
@@ -124,13 +124,13 @@ public function start(Request $request, ?AuthenticationException $authException
             );
         }
 
-        return new RedirectResponse(
-            $this
-                ->urlGenerator
-                ->generate(
-                    'cas_bundle_login',
-                )
-        );
+        // Here we could also forward the request to `cas_bundle_login`.
+        // Maybe this is something we should do at some point.
+        $response = $this->cas->login($request->query->all());
+
+        return null === $response ?
+            new RedirectResponse('/') :
+            $this->httpFoundationFactory->createResponse($response);
     }
 
     public function supports(Request $request): bool