UserRoutes.scala

class UserRoutes {
  this: UserServiceComponent =>

  val routes: Route =
    getPath("users" / JavaUUID) { uuid =>
      respond(userService.getUser(GetUserRequest(None, Some(uuid))))
    } ~
    getPath("users" / Segment) { handle =>
      respond(userService.getUser(GetUserRequest(Some(handle), None)))
    }

}