Symfony 2事件侦听器-身份验证失败/防火墙侦听器

Question

So I can perform a simple request listener:

public function onKernelRequest(GetResponseEvent $event)
{
    $request = $event->getRequest();

        //etc.

And in services.yml:

  listener.my_request_listener:
    arguments: 
      - "@translator"
    class: MyBundle\EventListener\RequestListener
    tags: 
      - 
        event: kernel.request
        method: onKernelRequest
        name: kernel.event_listener
      - 
        event: kernel.response
        method: onKernelResponse
        name: kernel.event_listener

What I want to do now is detect if authentication has failed (using Symfony2's in-built security component). I have all the security setup, but I need to detect when security fails. Something like this:

public function onKernelAuthFail(GetAuthenticationFailEvent $event) {

    //authentication failed, so action can be performed here before it redirects

}

I've seen this: http://api.symfony.com/2.3/Symfony/Component/Security/Http/Firewall/ListenerInterface.html and talk of 'firewall' listeners, but I just can't understand how to do it. I bet it's only a line of code or something.

Answer 1

Take a look at the DefaultAuthenticationFailureHandler class. It should be under Symfony\\Component\\Security\\Http\\Authentication . This is the default listener that Symfony uses when authentication fails.

But you can write your own and use it by adding it to your security.yml like this:

firewalls:
    firewall_name:
        form_login:
            failure_handler: your.service.id

Here's a complete reference to the security.yml configuration: http://symfony.com/doc/current/reference/configuration/security.html