Scala on Play 2.2: How do I redirect a page in a filter?

Question

Also, I how do I give the user the requested page when the if statement is not satisfied?

Here is what I have so far:

object AuthFilter extends EssentialFilter {
  def apply(next: EssentialAction) = new EssentialAction {
    def apply(request: RequestHeader) = {
      if(request.session.get("auth").isEmpty && !request.path.contains("/login")){
        //redirect to login page.
      } else {
        //show requested page.
        next(request) //is this correct?
      }
    }
  }
}

Answer 1

Why not extends Filter instead of EssentialFilter?

object AuthFilter extends Filter {

  def apply(next: (RequestHeader) => Future[SimpleResult])(request: RequestHeader): Future[SimpleResult] = {
    if(request.session.get("auth").isEmpty && !request.path.contains("/login")){
        Future.successful(Ok(views.html.yourLoginPage()))
      } else {
        next(request)
      }
  } 
}