How to know if the user is logged in (in the GSP)
grails, gsp, spring-security
Solution
It looks like you're doing your own authentication, rather than going through the spring security authentication process. The `<sec:ifLoggedIn>` tag relies on spring security handling the authentication.
The usual way this is handled in a spring security app is by posting the login request to `/j_spring_security_check`, which, behind the scenes, gets filtered by a UsernamePasswordAuthenticationFilter.
Grails and the spring security plugin make this relatively painless by providing a `LoginController` and `auth.gsp` that you can use as a starting point. Run the `s2-quickstart` script (which also creates User and Role domain objects), or just copy them from the `spring-security-core` templates directory.
Problem
I have `index.gsp` that presents a page. In that page there is a button to register, and a button to log in. Once you have logged in, if the login is ok, the app drives you again to `index.gsp`. I need that, if the user is logged in, these buttons disappear, and instead say "Hello, [username]". I've tried with this code, but it doesn't work (it is never logged in): In the Controller: ``` def dologin(){ def user=Usuario.findByUsernameAndPassword(params.username,springSecurityService.encodePassword(params.password) ) if(user){ redirect (controller:'usuario', action:'index') }else{ flash.message=message(code:'default.user.not.found', args:[message(code: 'params.username', default:'Usuario'), params.id]) def userlogged = springSecurityService.getCurrentUser() render view: 'index', model: [user: user] } } ``` In index.gsp (is not full, only the piece that matters): ``` <sec:ifNotLoggedIn> <div id="buttons"> <div id="login"><a href="loginurl">Login</a> </div> <div id="register"><a href="registerurl">Registrarse</a> </div> </div> </sec:ifNotLoggedIn> <sec:ifLoggedIn> <div id="greet">Hello!</div> </sec:ifLoggedIn> ``` Any help would be appreciated. Thank you.