--- /dev/null
+<?php
+
+namespace Wallabag\CoreBundle\ParamConverter;
+
+use Sensio\Bundle\FrameworkExtraBundle\Request\ParamConverter\ParamConverterInterface;
+use Doctrine\Common\Persistence\ManagerRegistry;
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Wallabag\CoreBundle\Entity\User;
+
+/**
+ * ParamConverter used in the RSS controller to retrieve the right user according to
+ * username & token given in the url.
+ *
+ * @see http://stfalcon.com/en/blog/post/symfony2-custom-paramconverter
+ */
+class UsernameRssTokenConverter implements ParamConverterInterface
+{
+ private $registry;
+
+ /**
+ * @param ManagerRegistry $registry Manager registry
+ */
+ public function __construct(ManagerRegistry $registry = null)
+ {
+ $this->registry = $registry;
+ }
+
+ /**
+ * {@inheritdoc}
+ *
+ * Check, if object supported by our converter
+ */
+ public function supports(ParamConverter $configuration)
+ {
+ // If there is no manager, this means that only Doctrine DBAL is configured
+ // In this case we can do nothing and just return
+ if (null === $this->registry || !count($this->registry->getManagers())) {
+ return false;
+ }
+
+ // Check, if option class was set in configuration
+ if (null === $configuration->getClass()) {
+ return false;
+ }
+
+ // Get actual entity manager for class
+ $em = $this->registry->getManagerForClass($configuration->getClass());
+
+ // Check, if class name is what we need
+ if ('Wallabag\CoreBundle\Entity\User' !== $em->getClassMetadata($configuration->getClass())->getName()) {
+ return false;
+ }
+
+ return true;
+ }
+
+ /**
+ * {@inheritdoc}
+ *
+ * Applies converting
+ *
+ * @throws \InvalidArgumentException When route attributes are missing
+ * @throws NotFoundHttpException When object not found
+ */
+ public function apply(Request $request, ParamConverter $configuration)
+ {
+ $username = $request->attributes->get('username');
+ $rssToken = $request->attributes->get('token');
+
+ // Check, if route attributes exists
+ if (null === $username || null === $rssToken) {
+ throw new \InvalidArgumentException('Route attribute is missing');
+ }
+
+ // Get actual entity manager for class
+ $em = $this->registry->getManagerForClass($configuration->getClass());
+
+ $userRepository = $em->getRepository($configuration->getClass());
+
+ // Try to find user by its username and config rss_token
+ $user = $userRepository->findOneByUsernameAndRsstoken($username, $rssToken);
+
+ if (null === $user || !($user instanceof User)) {
+ throw new NotFoundHttpException(sprintf('%s not found.', $configuration->getClass()));
+ }
+
+ // Map found user to the route's parameter
+ $request->attributes->set($configuration->getName(), $user);
+ }
+}