class IpIsBanned

class IpIsBanned extends RulesConditionBase implements ContainerFactoryPluginInterface {
  
  /**
   * The ban manager used to check the IP.
   *
   * @var \Drupal\ban\BanIpManagerInterface
   */
  protected $banManager;
  
  /**
   * The corresponding request stack.
   *
   * @var \Symfony\Component\HttpFoundation\RequestStack
   */
  protected $requestStack;
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static($configuration, $plugin_id, $plugin_definition, $container->get('ban.ip_manager'), $container->get('request_stack'));
  }
  
  /**
   * Constructs a IpIsBanned object.
   *
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin ID for the plugin instance.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\ban\BanIpManagerInterface $ban_manager
   *   The ban manager.
   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
   *   The corresponding request stack.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, BanIpManagerInterface $ban_manager, RequestStack $request_stack) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->banManager = $ban_manager;
    $this->requestStack = $request_stack;
  }
  
  /**
   * Checks if an IP address is banned.
   *
   * @param string $ip
   *   The IP address to check.
   *
   * @return bool
   *   TRUE if the IP address is banned.
   */
  protected function doEvaluate($ip = NULL) {
    if (!isset($ip)) {
      $ip = $this->requestStack
        ->getCurrentRequest()
        ->getClientIp();
    }
    return $this->banManager
      ->isBanned($ip);
  }

}