LocaleListener.php

<?php

namespace Acme\MainBundle\Listener;

use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Security\Core\SecurityContext;
use Symfony\Component\HttpKernel\HttpKernel;

use Doctrine\ORM\EntityManager;

use Acme\UserBundle\Entity\User;

class LocaleListener implements EventSubscriberInterface
{
    private $defaultLocale;
    private $securityContext;
    private $em;

    public function __construct($defaultLocale = 'fr', SecurityContext $securityContext, EntityManager $em)
    {
        $this->defaultLocale = $defaultLocale;
        $this->securityContext = $securityContext;
        $this->em = $em;
    }

    public function onKernelRequest(GetResponseEvent $event)
    {
        if (HttpKernel::MASTER_REQUEST != $event->getRequestType()) {
            return;
        }

        $request = $event->getRequest();
        // Impersonate account check
        if (!$request->hasPreviousSession()) {
            return;
        }

        $user = null;
        if ($this->securityContext->getToken()) {
            $user = $this->securityContext->getToken()->getUser();
        }

        if ($locale = $request->get('_locale')) {
            $request->getSession()->set('_locale', $locale);
            if (null !== $user && $user != 'anon.' && $user->getLocale() !== $locale) {
                $user->setLocale($locale);
                $this->em->persist($user);
                $this->em->flush();
            }
        }
        else if ($user instanceof User && null !== $user->getLocale()) {
            $request->getSession()->set('_locale', $user->getLocale());
        }

        $request->setLocale($request->getSession()->get('_locale', $this->defaultLocale));
    }

    static public function getSubscribedEvents()
    {
        return array(
            // must be registered before the default Locale listener
            KernelEvents::REQUEST => array(array('onKernelRequest', -50)),
        );
    }
}

?>