--- /dev/null
+<?php
+
+namespace Drupal\media;
+
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Entity\EntityAccessControlHandler;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Session\AccountInterface;
+
+/**
+ * Defines an access control handler for the media entity.
+ */
+class MediaAccessControlHandler extends EntityAccessControlHandler {
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
+ if ($account->hasPermission('administer media')) {
+ return AccessResult::allowed()->cachePerPermissions();
+ }
+
+ $is_owner = ($account->id() && $account->id() === $entity->getOwnerId());
+ switch ($operation) {
+ case 'view':
+ $access_result = AccessResult::allowedIf($account->hasPermission('view media') && $entity->isPublished())
+ ->cachePerPermissions()
+ ->addCacheableDependency($entity);
+ if (!$access_result->isAllowed()) {
+ $access_result->setReason("The 'view media' permission is required and the media item must be published.");
+ }
+ return $access_result;
+
+ case 'update':
+ if ($account->hasPermission('update any media')) {
+ return AccessResult::allowed()->cachePerPermissions();
+ }
+ return AccessResult::allowedIf($account->hasPermission('update media') && $is_owner)
+ ->cachePerPermissions()
+ ->cachePerUser()
+ ->addCacheableDependency($entity);
+
+ case 'delete':
+ if ($account->hasPermission('delete any media')) {
+ return AccessResult::allowed()->cachePerPermissions();
+ }
+ return AccessResult::allowedIf($account->hasPermission('delete media') && $is_owner)
+ ->cachePerPermissions()
+ ->cachePerUser()
+ ->addCacheableDependency($entity);
+
+ default:
+ return AccessResult::neutral()->cachePerPermissions();
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function checkCreateAccess(AccountInterface $account, array $context, $entity_bundle = NULL) {
+ return AccessResult::allowedIfHasPermissions($account, ['administer media', 'create media'], 'OR');
+ }
+
+}