/**
     * The authenticate action.
     *
     * @return FOS\RestBundle\View\View A view
     */
    public function getAuthenticateAction()
    {
        $request = $this->container->get('request');

        $username = $request->query->get('username');
        $password = $request->query->get('password');

        $userManager = $this->container->get('fos_user.user_manager');

        $user = $userManager->loadUserByUsername($username);
        if (!$user) {
            throw new NotFoundHttpException(sprintf("No user with username %s exists.", $username));
        }

        $encoderFactory = $this->container->get('security.encoder_factory');
        $encoder = $encoderFactory->getEncoder($user);

        if ($user->getPassword() !== $encoder->encodePassword($password, $user->getSalt())) {
            throw new AuthenticationException("Unable to authenticate user credentials.");
        }

        $view = $this->container->get('fos_rest.view');
        $view->setParameters($user);

        return $view;
    }