JS app and CSRF: Guard may not be the best solution

[Rebolon]

I wrote the CSRFTokenAuthenticator just to add a csrf token check on all non GET route

But the guard also does the authentication whereas by default it's allready done by Json login security.

So in fact i need an event called only when on firewall security_json and on non GET call.
This event would only check token validity and would not take care the fact that it's on login route or not.

How to do this ?