Adding describes url to messages and enforcing language neutrality in a few more places.

islandora.services.yml

@@ -3,7 +3,7 @@
 services:
   islandora.eventgenerator:
     class: Drupal\islandora\EventGenerator\EventGenerator
-    arguments: ['@language_manager']
+    arguments: ['@language_manager', '@islandora.media_source_service']
   islandora.stomp:
     class: Stomp\StatefulStomp
     factory: ['Drupal\islandora\StompFactory', create]
@@ -16,12 +16,12 @@ services:
       - { name: event_subscriber }
   islandora.media_link_header_subscriber:
     class: Drupal\islandora\EventSubscriber\MediaLinkHeaderSubscriber
-    arguments: ['@entity_type.manager', '@entity_field.manager', '@access_manager', '@current_user', '@current_route_match', '@request_stack']
+    arguments: ['@entity_type.manager', '@entity_field.manager', '@access_manager', '@current_user', '@current_route_match', '@request_stack', '@language_manager']
     tags:
       - { name: event_subscriber }
   islandora.node_link_header_subscriber:
     class: Drupal\islandora\EventSubscriber\NodeLinkHeaderSubscriber
-    arguments: ['@entity_type.manager', '@entity_field.manager', '@access_manager', '@current_user', '@current_route_match', '@request_stack', '@islandora.utils']
+    arguments: ['@entity_type.manager', '@entity_field.manager', '@access_manager', '@current_user', '@current_route_match', '@request_stack', '@language_manager', '@islandora.utils']
     tags:
       - { name: event_subscriber }
   islandora.admin_view_route_subscriber:

src/EventGenerator/EventGenerator.php

@@ -5,6 +5,7 @@ namespace Drupal\islandora\EventGenerator;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Language\LanguageManagerInterface;
 use Drupal\Core\Url;
+use Drupal\islandora\MediaSource\MediaSourceService;
 use Drupal\user\UserInterface;
 
 /**
@@ -21,14 +22,24 @@ class EventGenerator implements EventGeneratorInterface {
    */
   protected $languageManager;
 
+  /**
+   * Media source service.
+   *
+   * @var \Drupal\islandora\MediaSource\MediaSourceService
+   */
+  protected $mediaSource;
+
   /**
    * Constructor.
    *
    * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
    *   Language manager.
+   * @param \Drupal\islandora\MediaSource\MediaSourceService $media_source
+   *   Media source service.
    */
-  public function __construct(LanguageManagerInterface $language_manager) {
+  public function __construct(LanguageManagerInterface $language_manager, MediaSourceService $media_source) {
     $this->languageManager = $language_manager;
+    $this->mediaSource = $media_source;
   }
 
   /**
@@ -39,12 +50,13 @@ class EventGenerator implements EventGeneratorInterface {
     $user_url = $user->toUrl()->setAbsolute()->toString();
     $entity_type = $entity->getEntityTypeId();
 
+    $undefined = $this->languageManager->getLanguage('und');
+
     if ($entity_type == 'file') {
-      $entity_url = $entity->url();
+      $entity_url = $entity->url('canonical', ['absolute' => TRUE, 'language' => $undefined]);
       $mimetype = $entity->getMimeType();
     }
     else {
-      $undefined = $this->languageManager->getLanguage('und');
       $entity_url = Url::fromRoute(
         "rest.entity.$entity_type.GET",
         [$entity_type => $entity->id()],
@@ -111,6 +123,20 @@ class EventGenerator implements EventGeneratorInterface {
       ];
     }
 
+    // Add a link to the file described by a media.
+    if ($entity_type == 'media') {
+      $file = $this->mediaSource->getSourceFile($entity);
+      if ($file) {
+        $event['object']['url'][] = [
+          "name" => "Describes",
+          "type" => "Link",
+          "href" => $file->url('canonical', ['absolute' => TRUE, 'language' => $undefined]),
+          "mediaType" => $file->getMimeType(),
+          "rel" => "describes",
+        ];
+      }
+    }
+
     unset($data["event"]);
     unset($data["queue"]);
 

src/EventSubscriber/LinkHeaderSubscriber.php

@@ -6,6 +6,7 @@ use Drupal\Core\Access\AccessManagerInterface;
 use Drupal\Core\Entity\EntityFieldManager;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityTypeManager;
+use Drupal\Core\Language\LanguageManagerInterface;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\Core\Url;
@@ -64,6 +65,13 @@ abstract class LinkHeaderSubscriber implements EventSubscriberInterface {
    */
   protected $requestStack;
 
+  /**
+   * Language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
   /**
    * Constructor.
    *
@@ -79,6 +87,8 @@ abstract class LinkHeaderSubscriber implements EventSubscriberInterface {
    *   The route match object.
    * @param Symfony\Component\HttpFoundation\RequestStack $request_stack
    *   Request stack (for current request).
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   Language manager.
    */
   public function __construct(
     EntityTypeManager $entity_type_manager,
@@ -86,7 +96,8 @@ abstract class LinkHeaderSubscriber implements EventSubscriberInterface {
     AccessManagerInterface $access_manager,
     AccountInterface $account,
     RouteMatchInterface $route_match,
-    RequestStack $request_stack
+    RequestStack $request_stack,
+    LanguageManagerInterface $language_manager
   ) {
     $this->entityTypeManager = $entity_type_manager;
     $this->entityFieldManager = $entity_field_manager;
@@ -96,6 +107,7 @@ abstract class LinkHeaderSubscriber implements EventSubscriberInterface {
     $this->accessManager = $access_manager;
     $this->account = $account;
     $this->requestStack = $request_stack;
+    $this->languageManager = $language_manager;
   }
 
   /**

src/EventSubscriber/MediaLinkHeaderSubscriber.php

@@ -77,9 +77,10 @@ class MediaLinkHeaderSubscriber extends LinkHeaderSubscriber implements EventSub
     }
 
     // Collect file links for the media.
+    $undefined = $this->languageManager->getLanguage('und');
     foreach ($media->get($source_field)->referencedEntities() as $referencedEntity) {
       if ($referencedEntity->access('view')) {
-        $file_url = $referencedEntity->url('canonical', ['absolute' => TRUE]);
+        $file_url = $referencedEntity->url('canonical', ['absolute' => TRUE, 'language' => $undefined]);
         $links[] = "<$file_url>; rel=\"describes\"; type=\"{$referencedEntity->getMimeType()}\"";
       }
     }

src/EventSubscriber/NodeLinkHeaderSubscriber.php

@@ -5,8 +5,10 @@ namespace Drupal\islandora\EventSubscriber;
 use Drupal\Core\Access\AccessManagerInterface;
 use Drupal\Core\Entity\EntityFieldManager;
 use Drupal\Core\Entity\EntityTypeManager;
+use Drupal\Core\Language\LanguageManagerInterface;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Url;
 use Drupal\islandora\IslandoraUtils;
 use Drupal\node\NodeInterface;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
@@ -42,6 +44,8 @@ class NodeLinkHeaderSubscriber extends LinkHeaderSubscriber implements EventSubs
    *   The route match object.
    * @param Symfony\Component\HttpFoundation\RequestStack $request_stack
    *   Request stack (for current request).
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   Language manager.
    * @param \Drupal\islandora\IslandoraUtils $utils
    *   Derivative utils.
    */
@@ -52,16 +56,18 @@ class NodeLinkHeaderSubscriber extends LinkHeaderSubscriber implements EventSubs
     AccountInterface $account,
     RouteMatchInterface $route_match,
     RequestStack $request_stack,
+    LanguageManagerInterface $language_manager,
     IslandoraUtils $utils
   ) {
-    $this->entityTypeManager = $entity_type_manager;
-    $this->entityFieldManager = $entity_field_manager;
-    $this->accessManager = $access_manager;
-    $this->account = $account;
-    $this->routeMatch = $route_match;
-    $this->accessManager = $access_manager;
-    $this->account = $account;
-    $this->requestStack = $request_stack;
+    parent::__construct(
+      $entity_type_manager,
+      $entity_field_manager,
+      $access_manager,
+      $account,
+      $route_match,
+      $request_stack,
+      $language_manager
+    );
     $this->utils = $utils;
   }
 
@@ -99,8 +105,13 @@ class NodeLinkHeaderSubscriber extends LinkHeaderSubscriber implements EventSubs
    */
   protected function generateRelatedMediaLinks(NodeInterface $node) {
     $links = [];
+    $undefined = $this->languageManager->getLanguage('und');
     foreach ($this->utils->getMedia($node) as $media) {
-      $url = $media->url('canonical', ['absolute' => TRUE]);
+      $url = Url::fromRoute(
+        "rest.entity.media.GET",
+        ['media' => $media->id()],
+        ['absolute' => TRUE, 'language' => $undefined]
+      )->toString();
       foreach ($media->referencedEntities() as $term) {
         if ($term->getEntityTypeId() == 'taxonomy_term' && $term->hasField('field_external_uri')) {
           $field = $term->get('field_external_uri');

tests/src/Kernel/EventGeneratorTest.php

@@ -64,7 +64,10 @@ class EventGeneratorTest extends IslandoraKernelTestBase {
     $this->entity->save();
 
     // Create the event generator so we can test it.
-    $this->eventGenerator = new EventGenerator($this->container->get('language_manager'));
+    $this->eventGenerator = new EventGenerator(
+      $this->container->get('language_manager'),
+      $this->container->get('islandora.media_source_service')
+    );
   }
 
   /**
@@ -146,8 +149,11 @@ class EventGeneratorTest extends IslandoraKernelTestBase {
     foreach ($msg['actor']['url'] as $url) {
       $this->assertTrue($url['type'] == 'Link', "'url' entries must have type 'Link'");
       $this->assertTrue(
-            $url['mediaType'] == 'application/ld+json' || $url['mediaType'] == 'text/html',
-            "'url' entries must be either html or jsonld"
+        in_array(
+          $url['mediaType'],
+          ['application/json', 'application/ld+json', 'text/html']
+        ),
+        "'url' entries must be either html, json, or jsonld"
       );
     }
 
@@ -158,12 +164,15 @@ class EventGeneratorTest extends IslandoraKernelTestBase {
         $msg["object"]["id"] == "urn:uuid:{$this->entity->uuid()}",
         "Id must be an URN with entity's UUID"
     );
-    $this->assertTrue(array_key_exists("url", $msg["actor"]), "Object must have 'url' key.");
-    foreach ($msg['actor']['url'] as $url) {
+    $this->assertTrue(array_key_exists("url", $msg["object"]), "Object must have 'url' key.");
+    foreach ($msg['object']['url'] as $url) {
       $this->assertTrue($url['type'] == 'Link', "'url' entries must have type 'Link'");
       $this->assertTrue(
-            $url['mediaType'] == 'application/ld+json' || $url['mediaType'] == 'text/html',
-            "'url' entries must be either html or jsonld"
+        in_array(
+          $url['mediaType'],
+          ['application/json', 'application/ld+json', 'text/html']
+        ),
+        "'url' entries must be either html, json, or jsonld"
       );
     }
   }