MenuLinkContentAccessControlHandler::checkAccess

protected MenuLinkContentAccessControlHandler::checkAccess(EntityInterface $entity, $operation, AccountInterface $account)

protected function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
  switch ($operation) {
    case 'view':
      // There is no direct viewing of a menu link, but still for purposes of
      // content_translation we need a generic way to check access.
      return AccessResult::allowedIfHasPermission($account, 'administer menu');

    case 'update':
      if (!$account->hasPermission('administer menu')) {
        return AccessResult::neutral()->cachePerPermissions();
      }
      else {
        // If there is a URL, this is an external link so always accessible.
        $access = AccessResult::allowed()->cachePerPermissions()->addCacheableDependency($entity);
        /** @var \Drupal\menu_link_content\MenuLinkContentInterface $entity */
        // We allow access, but only if the link is accessible as well.
        if (($url_object = $entity->getUrlObject()) && $url_object->isRouted()) {
          $link_access = $this->accessManager->checkNamedRoute($url_object->getRouteName(), $url_object->getRouteParameters(), $account, TRUE);
          $access = $access->andIf($link_access);
        }
        return $access;
      }

    case 'delete':
      return AccessResult::allowedIf(!$entity->isNew() && $account->hasPermission('administer menu'))->cachePerPermissions()->addCacheableDependency($entity);
  }
}