Changing default check_path behavior in Symfony2 [duplicate] - symfony

Question

I need to disable redirection after login check, because I need to get only that the login was success or not. After submission /login_check url give me the right data, but keep redirecting to /login (on failure).
/login is blank after that.
I am trying to set up login form using extjs 4 so I need to validate trough an ajax post request.
login_check should authenticate, create user session and return whether it was success or failure, but no forwarding anywhere.
my login.html.twig looks like:
{% if is_granted("IS_AUTHENTICATED_REMEMBERED") %}
{ success:true }
{% else %}
{ success: false }
{% endif %}
and in security.yml:
firewalls:
main:
form_login:
provider: fos_userbundle
failure_path: null
failure_forward: false

Answer 1

Create an authentication handler:
namespace YourVendor\UserBundle\Handler;
// "use" statements here
class AuthenticationHandler
implements AuthenticationSuccessHandlerInterface,
AuthenticationFailureHandlerInterface
{
public function onAuthenticationSuccess(Request $request, TokenInterface $token)
{
if ($request->isXmlHttpRequest()) {
$result = array('success' => true);
return new Response(json_encode($result));
} else {
// Handle non XmlHttp request here
}
}
public function onAuthenticationFailure(Request $request, AuthenticationException $exception)
{
if ($request->isXmlHttpRequest()) {
$result = array('success' => false);
return new Response(json_encode($result));
} else {
// Handle non XmlHttp request here
}
}
}
Register the handler as a service:
services:
authentication_handler:
class: YourVendor\UserBundle\Handler\AuthenticationHandler
Register the service in the firewall:
firewalls:
main:
form_login:
success_handler: authentication_handler
failure_handler: authentication_handler
This is a rough example to give you the general idea — you'll need to figure out the details by yourself. If you're stuck and need further clarifications, put your questions in the comments and I'll try to elaborate the example.

Answer 2

The normal symfony flow is to redirect you to a login page if you are not logged in, which works fine for humans. But you seems to be looking for a programmatic solution.
Have you tried setting _target_path in your form, to declare what the "next page" should be? Symfony is always going to forward you somewhere, but you can set that somewhere to wherever you want.
I found these two pages useful for describing the inner workings of the login form:
How to customize your form login (search for _target_path)
Security page in the handbook