public function register(Request $request)
  {

    $username=$request->get('username');
    $password=$request->get('password');
    $email=$request->get('email');
    $captchaResponse=$request->get('g-recaptcha-response');

    $session =$request->getSession();

    $res1 = new Response();
    $response_data=array('status'=>0);

    if($session->get('captcha')===$captchaResponse)
    {
      $en = $this->container->get('user_model');

      $data=$en->register($username,$password,$email);

      $res1->headers->set('Content-Type','text/json');

      if($data['status']===false)
      {
        $response_data['data']="An Internal error Happened";
        error_log($data['data']);
      }
      else if($data['status']===-1)
      {
        $response_data['data']=$data['data'];
      }
      else
      {
        $response_data['status']=1;
        $response_data['data']="Please check your mail to confirm your registration.";

        /*Send Email*/
        $message = Swift_Message::newInstance()
                    ->setSubject('Please confirm your registration')
                    ->setFrom('symphotest@openmailbox.org')
                    ->setTo($email)
                    ->setBody($this->renderView('emails/confirm.html.twig',array('token'=>$data['data'])))
                    ->addPart(
                                $this->renderView('emails/registration.txt.twig',array('token'=>$data['data'])),
                                'text/plain'
                             );
        $this->get('mailer')->send($message);
      }
     }
     else
     {
       $response_data['data']="You have not given a correct captcha";
     }

    $res1->setContent(json_encode($response_data));


    $session->set('captcha',uniqid());//Generate gibberish in order not to reuse the very same captcha again
    return $res1;
  }

namespace AppBundleModels;

use DoctrineORMEntityManager;
use AppBundleUtilModelStatus;
use AppBundleExceptionsInvalidArgumentException;
use SwiftMessage;

class UserModel
{
    /** @var EntityManager */
    private $em;

    /** @var Swift_Mailer */
    private $mailer;

    /** @var Twig_Environment */
    private $twig;

    /**
     *
     * @param EntityManager $em
     * @param Swift_Mailer $mailer
     * @param Twig_Environment $twig
     */
    public function construct(EntityManager $em, Swift_Mailer $mailer,Twig_Environment $twig)
    {
        $this->em=$em;
        $this->$mailer=$mailer;
    }

    /**
     * Performs the actions needed for Registration
     *
     * @param unknown $username
     * @param unknown $password
     * @param unknown $email
     * @param Swift_Message $registrationMessage
     *
     * @return ModelStatus
     */
    public function register($username,$password,$email)
    {
        $modelStatus=new ModelStatus();

        try
        {
            /** @var AppBundleEntityUserRepository */
            $repository=$this->em->getRepository('AppBundle::Users');

            $token=$repository->register($username,$password,$email);

            $modelStatus->setData($token);
            $modelStatus->setStatus(ModelStatus::STATUS_SUCCESS);

            $this->mailer->send($registrationMessage);

            $message = Swift_Message::newInstance()
            ->setSubject('Please confirm your registration')
            ->setFrom('symphotest@openmailbox.org')
            ->setTo($email)
            ->setBody($this->twig->//->renderView('emails/confirm.html.twig',array('token'=>$data['data'])))
            ->addPart(
                    $this->renderView('emails/registration.txt.twig',array('token'=>$data['data'])),
                    'text/plain'
                    );
            $this->get('mailer')->send($message);
        }
        catch(InvalidArgumentException $arg)
        {
            $modelStatus->setStatus(ModelStatus::STATUS_FAILURE);
            $modelStatus->setMessage($arg->getMessage());
        }
        catch (Exception $e)
        {
            $modelStatus->setStatus(ModelStatus::STATUS_FAILURE);
            $modelStatus->setMessage($e->getMessage());
        }

        return $modelStatus;
    }
}

$message = Swift_Message::newInstance()
                        ->setSubject('Please confirm your registration')
                        ->setFrom('symphotest@openmailbox.org')
                        ->setTo($email)
                        ->setBody($this->renderView('emails/confirm.html.twig',array('token'=>$data['data'])))
                        ->addPart(
                                    $this->renderView('emails/registration.txt.twig',array('token'=>$data['data'])),
                                    'text/plain'
                                 );
            $this->get('mailer')->send($message);