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post.scala

trait AuthorizationHandler extends SprayJsonSupport with DefaultJsonProtocol {

  implicit def executionContext: ExecutionContext
  implicit def materializer: ActorMaterializer
  implicit def system: ActorSystem
  def log: LoggingAdapter

  def authorize: Directive1[AccessToken] =
    extractCredentials.flatMap {
      case Some(OAuth2BearerToken(token)) =>
        onComplete(verifyToken(token)).flatMap {
          case Success(Some(t)) =>
            provide(t)
          case _ =>
            log.warning(s"token $token is not valid")
            reject(AuthorizationFailedRejection)
        }
      case _ =>
        log.warning("no token present in request")
        reject(AuthorizationFailedRejection)
    }
    
  def verifyToken(token: String): Future[Option[AccessToken]] = ???
}