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Filename : DisallowRobotsIndexingListener.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * 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 <garypegeot@gmail.com>
 */
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');
        }
    }

    public static function getSubscribedEvents(): array
    {
        return [
            KernelEvents::RESPONSE => ['onResponse', -255],
        ];
    }
}