login date in spring security plugin for Grails

Question

i'm using spring security plugin , i want to save the user's login date in the DB so i wrote the below in the config file :

grails.plugin.springsecurity.useSecurityEventListener = true 
grails.plugin.springsecurity.onAuthenticationSuccessEvent= { e, appCtx ->
com.app.utils.UserActivity.withTransaction {
    def user = com.app.utils.UserActivity.findByUser(com.app.security.Users.get(appCtx.springSecurityService.principal.id))
    if (!user)
    { 
        new com.app.utils.UserActivity(user:user,userLoggedIn:new Date(),userLoggedOut: null).save(failOnError:true)

    }

    else
    {
        user.userLoggedIn= new Date()
        user.userLoggedOut=null
        user.save(failOnError:true)

    }

 }
}

the issue is that appCtx.springSecurityService.principal.id is always returning null , and are there any events for the logout action.

Answer 1

正确的获取主密码的方法是通过如下所示的身份验证事件：

e.getAuthentication().getPrincipal()