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<?php |
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/* |
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* This file is part of the Symfony package. |
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* |
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* (c) Fabien Potencier <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace App\EventSubscriber; |
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use Symfony\Component\EventDispatcher\EventSubscriberInterface; |
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use Symfony\Component\HttpFoundation\RedirectResponse; |
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use Symfony\Component\HttpKernel\Event\GetResponseEvent; |
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use Symfony\Component\HttpKernel\KernelEvents; |
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use Symfony\Component\Routing\Generator\UrlGeneratorInterface; |
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/** |
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* When visiting the homepage, this listener redirects the user to the most |
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* appropriate localized version according to the browser settings. |
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* |
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* See https://symfony.com/doc/current/components/http_kernel/introduction.html#the-kernel-request-event |
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* |
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* @author Oleg Voronkovich <[email protected]> |
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*/ |
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class RedirectToPreferredLocaleSubscriber implements EventSubscriberInterface |
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{ |
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private $urlGenerator; |
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private $locales = []; |
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private $defaultLocale = ''; |
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public function __construct(UrlGeneratorInterface $urlGenerator, string $locales, string $defaultLocale = null) |
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{ |
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$this->urlGenerator = $urlGenerator; |
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$this->locales = explode('|', trim($locales)); |
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if (empty($this->locales)) { |
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throw new \UnexpectedValueException('The list of supported locales must not be empty.'); |
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} |
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$this->defaultLocale = $defaultLocale ?: $this->locales[0]; |
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if (!in_array($this->defaultLocale, $this->locales, true)) { |
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throw new \UnexpectedValueException(sprintf('The default locale ("%s") must be one of "%s".', $this->defaultLocale, $locales)); |
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} |
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// Add the default locale at the first position of the array, |
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// because Symfony\HttpFoundation\Request::getPreferredLanguage |
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// returns the first element when no an appropriate language is found |
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array_unshift($this->locales, $this->defaultLocale); |
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$this->locales = array_unique($this->locales); |
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} |
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public static function getSubscribedEvents(): array |
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{ |
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return [ |
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KernelEvents::REQUEST => 'onKernelRequest', |
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]; |
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} |
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public function onKernelRequest(GetResponseEvent $event): void |
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{ |
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$request = $event->getRequest(); |
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// Ignore sub-requests and all URLs but the homepage |
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if (!$event->isMasterRequest() || '/' !== $request->getPathInfo()) { |
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return; |
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} |
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// Ignore requests from referrers with the same HTTP host in order to prevent |
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// changing language for users who possibly already selected it for this application. |
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if (0 === mb_stripos($request->headers->get('referer'), $request->getSchemeAndHttpHost())) { |
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return; |
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} |
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$preferredLanguage = $request->getPreferredLanguage($this->locales); |
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if ($preferredLanguage !== $this->defaultLocale) { |
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$response = new RedirectResponse($this->urlGenerator->generate('homepage', ['_locale' => $preferredLanguage])); |
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$event->setResponse($response); |
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} |
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} |
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} |
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hgraca /
explicit-architecture-php
