fix: keep post-booking newsletter failures out of the booking flow

src/Service/BookingNewsletterOptIn.php

@@ -6,7 +6,6 @@ namespace App\Service;
 
 use App\Entity\User;
 use App\Enum\NewsletterOptInContext;
-use App\Exception\NewsletterProviderException;
 use App\Form\Model\BookingDto;
 use App\Form\Model\ParticipantDto;
 use Psr\Log\LoggerInterface;
@@ -102,13 +101,16 @@ class BookingNewsletterOptIn
 
     public function subscribeApplicant(string $email, ?ParticipantDto $applicant): void
     {
+        // Everything here runs after the booking API has accepted the booking, so nothing may
+        // escape: an exception would reach the controller's generic handler, show a technical
+        // error and leave the booking session intact, inviting a duplicate booking.
         try {
             $this->newsletterManager->requestConfirmation(
                 $email,
                 $applicant?->firstName,
                 $applicant?->lastName,
             );
-        } catch (NewsletterProviderException|\InvalidArgumentException $exception) {
+        } catch (\Throwable $exception) {
             $this->logger->warning('Newsletter confirmation request failed after booking', [
                 'email' => $email,
                 'error' => $exception->getMessage(),
@@ -124,6 +126,11 @@ class BookingNewsletterOptIn
         foreach ($companions as $companion) {
             $email = mb_strtolower(trim((string) $companion->email));
 
+            // The booking already succeeded, so one unusable address must not stop the others and
+            // must never surface as a booking failure. The consent lookups are inside the block for
+            // the same reason: a repository failure there would otherwise reach the controller's
+            // generic handler and show a technical error for a booking that already exists.
+            try {
                 // Skipping a pending request avoids replacing a token the companion asked for
                 // themselves, which would silently break the link they already hold.
                 if (true === $this->newsletterManager->hasConfirmedOptIn($email)
@@ -131,9 +138,6 @@ class BookingNewsletterOptIn
                     continue;
                 }
 
-            // The booking already succeeded, so one unusable address must not stop the others
-            // and must never surface as a booking failure.
-            try {
                 $this->newsletterManager->requestConfirmation(
                     $email,
                     $companion->firstName,
@@ -141,7 +145,7 @@ class BookingNewsletterOptIn
                     NewsletterOptInContext::Companion,
                     $requestedByName,
                 );
-            } catch (NewsletterProviderException|\InvalidArgumentException $exception) {
+            } catch (\Throwable $exception) {
                 $this->logger->warning('Companion newsletter confirmation request failed after booking', [
                     'email' => $email,
                     'error' => $exception->getMessage(),

tests/Service/BookingNewsletterOptInTest.php

@@ -110,6 +110,44 @@ class BookingNewsletterOptInTest extends TestCase
         self::assertSame(['[email protected]', '[email protected]'], $requestedEmails);
     }
 
+    public function testAFailingConsentLookupDoesNotEscapeToTheCaller(): void
+    {
+        $companions = $this->createCompanions([
+            '[email protected]',
+            '[email protected]',
+        ]);
+
+        $newsletterManager = $this->createMock(NewsletterManager::class);
+        $newsletterManager
+            ->method('hasConfirmedOptIn')
+            ->willReturnCallback(static function (string $email): bool {
+                if ('[email protected]' === $email) {
+                    throw new \RuntimeException('Database gone.');
+                }
+
+                return false;
+            });
+        $newsletterManager->method('hasPendingConfirmation')->willReturn(false);
+        $newsletterManager
+            ->expects(self::once())
+            ->method('requestConfirmation')
+            ->with('[email protected]');
+
+        $this->createService($newsletterManager)->subscribeCompanions($companions, 'Mia Muster');
+    }
+
+    public function testApplicantOptInFailureDoesNotEscapeToTheCaller(): void
+    {
+        $newsletterManager = $this->createStub(NewsletterManager::class);
+        $newsletterManager
+            ->method('requestConfirmation')
+            ->willThrowException(new \RuntimeException('Database gone.'));
+
+        $this->createService($newsletterManager)->subscribeApplicant('[email protected]', null);
+
+        $this->expectNotToPerformAssertions();
+    }
+
     public function testApplicantOptInUsesTheOwnWording(): void
     {
         $bookingDto = $this->createBookingDto([['[email protected]', 30]]);