feat: admin view listing a travel's mailing recipients from bpn-connect

src/Controller/Admin/TravelMailing/IndexController.php

@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Controller\Admin\TravelMailing;
+
+use App\BpnConnect\Exception\BpnConnectException;
+use App\BpnConnect\TravelsClient;
+use App\Form\Admin\TravelMailingLookupType;
+use App\Form\Model\TravelMailingLookupDto;
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Attribute\Route;
+use Symfony\Component\Security\Http\Attribute\IsGranted;
+
+#[IsGranted('ROLE_CUSTOMER_EXPERT')]
+class IndexController extends AbstractController
+{
+    public function __construct(
+        private readonly TravelsClient $travelsClient,
+    ) {
+    }
+
+    #[Route('/admin/travel-mailing', name: 'app_admin_travelmailing')]
+    public function index(Request $request): Response
+    {
+        $lookup = new TravelMailingLookupDto();
+        $form = $this->createForm(TravelMailingLookupType::class, $lookup, [
+            'action' => $this->generateUrl('app_admin_travelmailing'),
+        ]);
+        $form->handleRequest($request);
+
+        $result = null;
+        $failed = false;
+        if ($form->isSubmitted() && $form->isValid()) {
+            try {
+                $result = $this->travelsClient->getMailingRecipients((string) $lookup->travelCode);
+            } catch (BpnConnectException) {
+                // The client has already logged the cause; the page only needs to say it failed.
+                $failed = true;
+            }
+        }
+
+        return $this->render('admin/travel_mailing/index.html.twig', [
+            'form' => $form,
+            'result' => $result,
+            'failed' => $failed,
+        ]);
+    }
+}