added remember me feature #53 (#98)

cleanup event subscriber

src/EventSubscriber/RedirectToLocaleSubscriber.php

@@ -0,0 +1,97 @@
+<?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 App\EventSubscriber;
+
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+
+/**
+ * When visiting the homepage, this listener redirects the user to the most
+ * appropriate localized version according to the browser settings.
+ *
+ * See http://symfony.com/doc/current/components/http_kernel/introduction.html#the-kernel-request-event
+ *
+ * @author Oleg Voronkovich <oleg-voronkovich@yandex.ru>
+ */
+class RedirectToLocaleSubscriber
+{
+    /**
+     * @var UrlGeneratorInterface
+     */
+    private $urlGenerator;
+
+    /**
+     * List of supported locales.
+     *
+     * @var string[]
+     */
+    private $locales = [];
+
+    /**
+     * @var string
+     */
+    private $defaultLocale = '';
+
+    /**
+     * Constructor.
+     *
+     * @param UrlGeneratorInterface $urlGenerator
+     * @param string $locales Supported locales separated by '|'
+     * @param string|null $defaultLocale
+     */
+    public function __construct(UrlGeneratorInterface $urlGenerator, $locales, $defaultLocale = null)
+    {
+        $this->urlGenerator = $urlGenerator;
+
+        $this->locales = explode('|', trim($locales));
+        if (empty($this->locales)) {
+            throw new \UnexpectedValueException('The list of supported locales must not be empty.');
+        }
+        $this->defaultLocale = $defaultLocale ?: $this->locales[0];
+
+        if (!in_array($this->defaultLocale, $this->locales)) {
+            throw new \UnexpectedValueException(
+                sprintf('The default locale ("%s") must be one of "%s".', $this->defaultLocale, $locales)
+            );
+        }
+
+        // Add the default locale at the first position of the array,
+        // because Symfony\HttpFoundation\Request::getPreferredLanguage
+        // returns the first element when no an appropriate language is found
+        array_unshift($this->locales, $this->defaultLocale);
+        $this->locales = array_unique($this->locales);
+    }
+
+    /**
+     * @param GetResponseEvent $event
+     */
+    public function onKernelRequest(GetResponseEvent $event)
+    {
+        $request = $event->getRequest();
+
+        // Ignore sub-requests and all URLs but the homepage
+        if ('/' !== $request->getPathInfo()) {
+            return;
+        }
+        // Ignore requests from referrers with the same HTTP host in order to prevent
+        // changing language for users who possibly already selected it for this application.
+        if (0 === stripos($request->headers->get('referer'), $request->getSchemeAndHttpHost())) {
+            return;
+        }
+
+        $preferredLanguage = $request->getPreferredLanguage($this->locales);
+
+        $response = new RedirectResponse($this->urlGenerator->generate('homepage', ['_locale' => $preferredLanguage]));
+        $event->setResponse($response);
+    }
+}