Return only the host as audience for remote magazines (#1039)

Co-authored-by: Melroy van den Berg <[email protected]>

src/MessageHandler/ActivityPub/Outbox/CreateHandler.php

@@ -63,6 +63,7 @@ public function doWork(MessageInterface $message): void
                 ...$this->activityPubManager->createInboxesFromCC($activity, $entity->user),
                 ...$this->magazineRepository->findAudience($entity->magazine),
             ];
+            $this->logger->debug('sending create activity to {p}', ['p' => $receivers]);
         }
         $this->deliverManager->deliver(array_filter(array_unique($receivers)), $activity);
     }

src/Repository/MagazineRepository.php

@@ -392,6 +392,10 @@ private function getOverviewIds(array $result, string $type): array
 
     public function findAudience(Magazine $magazine): array
     {
+        if (null !== $magazine->apId) {
+            return [$magazine->apInboxUrl];
+        }
+
         $dql =
             'SELECT COUNT(u.id), u.apInboxUrl FROM '.User::class.' u WHERE u IN ('.
             'SELECT IDENTITY(ms.user) FROM '.MagazineSubscription::class.' ms WHERE ms.magazine = :magazine)'.