<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpKernel\EventListener;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
/**
* Ensures that the application is not indexed by search engines.
*
* @author Gary PEGEOT <[email protected]>
*/
class DisallowRobotsIndexingListener implements EventSubscriberInterface
{
private const HEADER_NAME = 'X-Robots-Tag';
public function onResponse(ResponseEvent $event): void
{
if (!$event->getResponse()->headers->has(static::HEADER_NAME)) {
$event->getResponse()->headers->set(static::HEADER_NAME, 'noindex');
}
}
/**
* {@inheritdoc}
*/
public static function getSubscribedEvents()
{
return [
KernelEvents::RESPONSE => ['onResponse', -255],
];
}
}