class ContentTranslationOverviewAccess

class ContentTranslationOverviewAccess implements AccessInterface {

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

  /**
   * Constructs a ContentTranslationOverviewAccess object.
   *
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager service.
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager) {
    $this->entityTypeManager = $entity_type_manager;
  }

  /**
   * Checks access to the translation overview for the entity and bundle.
   *
   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
   *   The parametrized route.
   * @param \Drupal\Core\Session\AccountInterface $account
   *   The currently logged in account.
   * @param string $entity_type_id
   *   The entity type ID.
   *
   * @return \Drupal\Core\Access\AccessResultInterface
   *   The access result.
   */
  public function access(RouteMatchInterface $route_match, AccountInterface $account, $entity_type_id) {

    /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
    $entity = $route_match
      ->getParameter($entity_type_id);
    if ($entity && $entity
      ->isTranslatable()) {

      // Get entity base info.
      $bundle = $entity
        ->bundle();

      // Get entity access callback.
      $definition = $this->entityTypeManager
        ->getDefinition($entity_type_id);
      $translation = $definition
        ->get('translation');
      $access_callback = $translation['content_translation']['access_callback'];
      $access = call_user_func($access_callback, $entity);
      if ($access
        ->isAllowed()) {
        return $access;
      }

      // Check "translate any entity" permission.
      if ($account
        ->hasPermission('translate any entity')) {
        return AccessResult::allowed()
          ->cachePerPermissions()
          ->inheritCacheability($access);
      }

      // Check per entity permission.
      $permission = "translate {$entity_type_id}";
      if ($definition
        ->getPermissionGranularity() == 'bundle') {
        $permission = "translate {$bundle} {$entity_type_id}";
      }
      return AccessResult::allowedIfHasPermission($account, $permission)
        ->inheritCacheability($access);
    }

    // No opinion.
    return AccessResult::neutral();
  }

}