gistfile1.scala

 def create() = Action(parse.json) { implicit request =>
    request.body.validate[UserPass].asOpt.flatMap { userPass =>
      UserService.find(userPass.username).map { user =>
        if (BCryptPasswordHasher.matches(user.password, userPass.password)) {
          Ok(Json.toJson(UserService.getAuthToken(user)))
        }
        else Unauthorized("Invalid credentials submitted.")
      }
    }.getOrElse(Unauthorized("InvalidCredentials submitted."))
  }