Can I inject a service into a filter in Grails?

Question

I have a service to get and set the user in the session. I would like to pass in some user information to each view if there is a logged in user and thought a filter would be th

Answer 1

import org.codehaus.groovy.grails.web.context.ServletContextHolder
import org.springframework.context.ApplicationContext
import org.springframework.web.context.support.WebApplicationContextUtils
class SecurityFilters {
    def userService

    def filters = {
        setUser(controller:'*', action:'*') {
            before = {
                def servletCtx = ServletContextHolder.getServletContext()
                ApplicationContext applicationContext = WebApplicationContextUtils.
                    getRequiredWebApplicationContext(servletCtx)
                userService =applicationContext.getBean('userService')
                if (userService.isLoggedIn()) {
                    request.user = userService.getUser()
                } else {
                    request.user = null
                }
            }
        }
    }   
}