fix: make it possible to preview draft-only translations

AmazeeLabs · Jan 14, 2025 · f2e7476 · f2e7476
1 parent ccbe4ef
commit f2e7476
Showing 1 changed file with 57 additions and 8 deletions.
diff --git a/packages/drupal/custom/src/EventSubscriber/EntityLanguageRedirectSubscriber.php b/packages/drupal/custom/src/EventSubscriber/EntityLanguageRedirectSubscriber.php
@@ -36,6 +36,28 @@ public static function getSubscribedEvents() {
   }
 
   public function onKernelRequest(RequestEvent $event): void {
+    $redirect = $this->getMissingDefaultRevisionRedirect($event)
+      ?? $this->getMissingTranslationRedirect($event);
+    if ($redirect) {
+      // Add the necessary cache contexts to the response, as redirect
+      // responses are cached as well.
+      $metadata = new CacheableMetadata();
+      $metadata->addCacheContexts([
+        'languages:language_interface',
+        'url.query_args',
+        'user',
+      ]);
+      $redirect->addCacheableDependency($metadata);
+      if ($this->routeMatch->getRouteName() === 'entity.node.canonical') {
+        $node = $this->routeMatch->getCurrentRouteMatch()->getParameter('node');
+        $redirect->addCacheableDependency($node);
+      }
+
+      $event->setResponse($redirect);
+    }
+  }
+
+  private function getMissingTranslationRedirect(RequestEvent $event): ?TrustedRedirectResponse {
     // In case the user tries to access a node in a language entity is not
     // translated to, we redirect to the entity in the original language and
     // display a warning message.
@@ -57,16 +79,43 @@ public function onKernelRequest(RequestEvent $event): void {
         }
         $urlString = $url->toString() . '?' . $queryString . 'content_language_not_available=true&requested_language=' . $requestedLanguageId;
 
-        // Add the necessary cache contexts to the response, as redirect
-        // responses are cached as well.
-        $metadata = new CacheableMetadata();
-        $metadata->addCacheContexts(['languages:language_interface', 'url.query_args']);
-        $response = new TrustedRedirectResponse($urlString);
-        $response->addCacheableDependency($entity);
-        $response->addCacheableDependency($metadata);
+        return new TrustedRedirectResponse($urlString);
+      }
+    }
 
-        $event->setResponse($response);
+    return NULL;
+  }
+
+  private function getMissingDefaultRevisionRedirect(RequestEvent $event): ?TrustedRedirectResponse {
+    // This spaghetti code detects if user is trying to view a translation that
+    // is a draft only and does not have a published revision on the canonical
+    // route.
+    // Why do we do it: The content translation overview page links to
+    // `/{lang}/node/{nid}`, but in the case mentioned above, the canonical
+    // route displays the content in the original language. Which is quite
+    // confusing.
+    if ($this->routeMatch->getRouteName() === 'entity.node.canonical') {
+      $entity = $this->routeMatch->getCurrentRouteMatch()->getParameter('node');
+      $requestedLanguageId = $this->languageManager->getCurrentLanguage(LanguageInterface::TYPE_CONTENT)->getId();
+      if ($entity->language()->getId() != $requestedLanguageId) {
+        $storage = \Drupal::entityTypeManager()->getStorage('node');
+        $latestRevisionId = $storage->getLatestTranslationAffectedRevisionId($entity->id(), $requestedLanguageId);
+        if ($latestRevisionId) {
+          /** @var \Drupal\Core\Entity\ContentEntityInterface $latestRevision */
+          $latestRevision = $storage->loadRevision($latestRevisionId);
+          $translations = $latestRevision->getTranslationLanguages();
+          if (array_key_exists($requestedLanguageId, $translations)) {
+            $latestRevision = $latestRevision->getTranslation($requestedLanguageId);
+            // Bingo! We found the target case. Redirect to the latest revision.
+            if ($latestRevision->access('view')) {
+              $url = $latestRevision->toUrl('latest-version')->toString();
+              return new TrustedRedirectResponse($url);
+            }
+          }
+        }
       }
     }
+    return NULL;
   }
+
 }