BanSubscriber.php

<?php

/**
 * @file
 * Definition of Drupal\ban\EventSubscriber\BanSubscriber.
 */
namespace Drupal\ban\EventSubscriber;

use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Drupal\ban\BanIpManager;

/**
 * Ban subscriber for controller requests.
 */
class BanSubscriber implements EventSubscriberInterface {

  /**
   * The manager used to check the IP against.
   *
   * @var Drupal\ban\BanIpManager
   */
  protected $manager;

  /**
   * Construct the BanSubscriber.
   *
   * @param Drupal\ban\BanIpManager $manager
   *   The manager used to check the IP against.
   */
  public function __construct(BanIpManager $manager) {
    $this->manager = $manager;
  }

  /**
   * Response with 403 if the visitor's IP adress is banned.
   *
   * @param Symfony\Component\HttpKernel\Event\GetResponseEvent $event
   *   The Event to process.
   */
  public function onKernelRequestBannedIpCheck(GetResponseEvent $event) {
    $ip = $event
      ->getRequest()
      ->getClientIp();
    if ($this->manager
      ->isDenied($ip)) {
      $response = new Response('Sorry, ' . check_plain($ip) . ' has been banned.', 403);
      $event
        ->setResponse($response);
    }
  }

  /**
   * Registers the methods in this class that should be listeners.
   *
   * @return array
   *   An array of event listener definitions.
   */
  static function getSubscribedEvents() {
    $events[KernelEvents::REQUEST][] = array(
      'onKernelRequestBannedIpCheck',
      40,
    );
    return $events;
  }

}