How to override Symfony2 Login for captcha control?

Question

First of all;

Adding Captcha to Symfony2 Login Page

I saw above conversation but this not exactly what i want. I just want to check if captcha is false right before authentication.

And no, i don't want to use a bundle for this.

I need to know, when symfony2 does security login events?

Diagram:

Login form submit -> check captcha -> check parameters -> do authentication.

Any idea?

Answer 1

I get it work with below.

<?php

namespace CS\UserBundle\Listener;

use Symfony\Component\Security\Core\Exception\BadCredentialsException;
use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;

class LoginListener
{
    public function onSecurityInteractiveLogin(InteractiveLoginEvent $event)
    {
        $request = $event->getRequest();
        $captcha = $request->request->get('captcha');

        if(!empty($captcha) && $captcha !== $request->getSession()->get('captcha')) {
            throw new BadCredentialsException('Doğrulama Kodu Yanlış!');
        }
    }
}

Service (yml)

services:
  cs_user.login_listener:
      class: CS\UserBundle\Listener\LoginListener
      tags:
          - { name: kernel.event_listener, event: security.interactive_login }