File manager

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height:90%'>&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * 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\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
use Symfony\Component\HttpKernel\Event\KernelEvent;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\Routing\RequestContextAwareInterface;

/**
 * Initializes the locale based on the current request.
 *
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * @final
 */
class LocaleListener implements EventSubscriberInterface
{
    public function __construct(
        private RequestStack $requestStack,
        private string $defaultLocale = &#039;en&#039;,
        private ?RequestContextAwareInterface $router = null,
        private bool $useAcceptLanguageHeader = false,
        private array $enabledLocales = [],
    ) {
    }

    public function setDefaultLocale(KernelEvent $event): void
    {
        $event-&gt;getRequest()-&gt;setDefaultLocale($this-&gt;defaultLocale);
    }

    public function onKernelRequest(RequestEvent $event): void
    {
        $request = $event-&gt;getRequest();

        $this-&gt;setLocale($request);
        $this-&gt;setRouterContext($request);
    }

    public function onKernelFinishRequest(FinishRequestEvent $event): void
    {
        if (null !== $parentRequest = $this-&gt;requestStack-&gt;getParentRequest()) {
            $this-&gt;setRouterContext($parentRequest);
        }
    }

    private function setLocale(Request $request): void
    {
        if ($locale = $request-&gt;attributes-&gt;get(&#039;_locale&#039;)) {
            $request-&gt;setLocale($locale);
        } elseif ($this-&gt;useAcceptLanguageHeader) {
            if ($request-&gt;getLanguages() &amp;&amp; $preferredLanguage = $request-&gt;getPreferredLanguage($this-&gt;enabledLocales)) {
                $request-&gt;setLocale($preferredLanguage);
            }
            $request-&gt;attributes-&gt;set(&#039;_vary_by_language&#039;, true);
        }
    }

    private function setRouterContext(Request $request): void
    {
        $this-&gt;router?-&gt;getContext()-&gt;setParameter(&#039;_locale&#039;, $request-&gt;getLocale());
    }

    public static function getSubscribedEvents(): array
    {
        return [
            KernelEvents::REQUEST =&gt; [
                [&#039;setDefaultLocale&#039;, 100],
                // must be registered after the Router to have access to the _locale
                [&#039;onKernelRequest&#039;, 16],
            ],
            KernelEvents::FINISH_REQUEST =&gt; [[&#039;onKernelFinishRequest&#039;, 0]],
        ];
    }
}
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