class ContentTranslationDeleteAccess

class ContentTranslationDeleteAccess implements AccessInterface {

  /**
   * The entity type manager.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * The content translation manager.
   *
   * @var \Drupal\content_translation\ContentTranslationManagerInterface
   */
  protected $contentTranslationManager;

  /**
   * Constructs a ContentTranslationDeleteAccess object.
   *
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $manager
   *   The entity type manager.
   * @param \Drupal\content_translation\ContentTranslationManagerInterface $content_translation_manager
   *   The content translation manager.
   */
  public function __construct(EntityTypeManagerInterface $manager, ContentTranslationManagerInterface $content_translation_manager) {
    $this->entityTypeManager = $manager;
    $this->contentTranslationManager = $content_translation_manager;
  }

  /**
   * Checks access to translation deletion for the specified route match.
   *
   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
   *   The parameterized route.
   * @param \Drupal\Core\Session\AccountInterface $account
   *   The currently logged in account.
   *
   * @return \Drupal\Core\Access\AccessResultInterface
   *   The access result.
   */
  public function access(RouteMatchInterface $route_match, AccountInterface $account) {
    $requirement = $route_match
      ->getRouteObject()
      ->getRequirement('_access_content_translation_delete');
    $entity_type_id = current(explode('.', $requirement));
    $entity = $route_match
      ->getParameter($entity_type_id);
    return $this
      ->checkAccess($entity);
  }

  /**
   * Checks access to translation deletion for the specified entity.
   *
   * @param \Drupal\Core\Entity\ContentEntityInterface $entity
   *   The entity translation to be deleted.
   *
   * @return \Drupal\Core\Access\AccessResultInterface
   *   The access result.
   */
  public function checkAccess(ContentEntityInterface $entity) {
    $result = AccessResult::allowed();
    $entity_type_id = $entity
      ->getEntityTypeId();
    $result
      ->addCacheableDependency($entity);

    // Add the cache dependencies used by
    // ContentTranslationManager::isPendingRevisionSupportEnabled().
    if (\Drupal::moduleHandler()
      ->moduleExists('content_moderation')) {
      foreach (Workflow::loadMultipleByType('content_moderation') as $workflow) {
        $result
          ->addCacheableDependency($workflow);
      }
    }
    if (!ContentTranslationManager::isPendingRevisionSupportEnabled($entity_type_id, $entity
      ->bundle())) {
      return $result;
    }
    if ($entity
      ->isDefaultTranslation()) {
      return $result;
    }
    $config = ContentLanguageSettings::load($entity_type_id . '.' . $entity
      ->bundle());
    $result
      ->addCacheableDependency($config);
    if (!$this->contentTranslationManager
      ->isEnabled($entity_type_id, $entity
      ->bundle())) {
      return $result;
    }

    /** @var \Drupal\Core\Entity\ContentEntityStorageInterface $storage */
    $storage = $this->entityTypeManager
      ->getStorage($entity_type_id);
    $revision_id = $storage
      ->getLatestTranslationAffectedRevisionId($entity
      ->id(), $entity
      ->language()
      ->getId());
    if (!$revision_id) {
      return $result;
    }

    /** @var \Drupal\Core\Entity\ContentEntityInterface $revision */
    $revision = $storage
      ->loadRevision($revision_id);
    if ($revision
      ->wasDefaultRevision()) {
      return $result;
    }
    $result = $result
      ->andIf(AccessResult::forbidden());
    return $result;
  }

}