玩2.2 EssentialAction与期货 [英] Play 2.2 EssentialAction With Futures

问题描述

我正在尝试实现类似于此示例的身份验证机制:

I'm trying to implement an authentication mechanism similar to this example:

    def HasToken(action: String => EssentialAction): EssentialAction = EssentialAction { requestHeader =>
      val maybeToken = requestHeader.headers.get("X-SECRET-TOKEN")
      maybeToken map { token =>
        action(token)(requestHeader) // apply requestHeader to EssentialAction produces the Iteratee[Array[Byte], SimpleResult]
      } getOrElse {
        Done(Unauthorized("401 No Security Token\n")) // 'Done' means the Iteratee has completed its computations
      }
    }

但是，在我的情况下，我正在将随机令牌值映射到存储在Mongodb中的服务器端的会话.目的是使用户能够随意终止其所有其他会话.

However, in my case I'm mapping a random token value to a session on the server side stored in Mongodb. The goal was to be able to let a user terminate all his other sessions at will.

但是，我从ReactiveMongo获得的数据将被包装在Future中.

However, the data I get from ReactiveMongo is going to be wrapped in a Future.

我想要这样的东西:

    def HasToken(action: String => EssentialAction): EssentialAction = EssentialAction { requestHeader =>
      val maybeToken = requestHeader.headers.get("session")
      maybeToken map { token =>
        //This returns a future..
        Session.find(session).map { result => 
          result match
            case Some(session) => action(session)(requestHeader)
            case None => Done(Unauthorized())
        }
      } getOrElse {
        Done(Unauthorized("401 No Security Token\n")) // 'Done' means the Iteratee has completed its computations
      }
    }

EssentialAction是否可能?

Is this possible with EssentialAction?

推荐答案

Iteratee.flatten来自Future[Iteratee[A, E]] => Iteratee[A, E]，因此您可以这样做:

Iteratee.flatten goes from Future[Iteratee[A, E]] => Iteratee[A, E] so you could do it like this:

def HasToken(action: String => EssentialAction): EssentialAction = EssentialAction { requestHeader =>
   val maybeToken = requestHeader.headers.get("session")

   val futureIteratee: Future[Iteratee[Array[Byte], SimpleResult]] = maybeToken map { token =>
     //This returns a future..
     Session.find(token).map {
       case Some(session) => action(session)(requestHeader)
       case None => Done[Array[Byte], SimpleResult](Unauthorized("Invalid token"))
     }
   } getOrElse {
     Future.successful(Done[Array[Byte], SimpleResult](Unauthorized("401 No Security Token\n")))
   }

   Iteratee.flatten(futureIteratee)
}

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