基于请求内容类型的不同路由Spray Routing 1.2.1

Question

我想支持提交到同一网址的几种不同的内容类型:

例如:

application/x-www-form-urlencoded,multipart/form-data,application/json

我想做的事情如下:

post {
  contentType(`application/x-www-form-urlencoded`) | 
  contentType(`multipart/form-data`) {
     // user POSTed a form
     entity(as[MyCaseClass]) { data =>
        complete { data.result }
     }
  } ~ contentType(`application/json`) {
     // user POSTed a JSON object
     entity(as[MyCaseClass]) { data =>
        complete { data.result }
     }
  }
}

我认为可能有一些方法可以使用自定义编组和解组,但我只需要在我的服务中的一两个位置,这看起来很简单.有人可以帮忙吗？

Answer 1

由于喷雾编组系统具有深刻的巧妙性,因此有一种非常优雅的方式可以实现这一目标.代码(要点)说明了这一点:

case class User(name: String, no: Int)

// Json marshaller
object UnMarshalling extends DefaultJsonProtocol {
  val jsonUser = jsonFormat2(User)
  val textUser = Unmarshaller[User](`text/plain`) {
      case HttpEntity.NonEmpty(contentType, data) =>
        val res = data.asString.drop(5).dropRight(1).split(',')
        User(res(0),res(1).toInt)
  }
  implicit val userMarshal = Unmarshaller.oneOf(jsonUser, textUser)
}

class UnMarshalTest extends FunSpec with ScalatestRouteTest with Matchers {
  import UnMarshalling._

  // Marshals response according to the Accept header media type
  val putOrder = path("user") {
    put {
      // Namespace clash with ScalaTestRoutes.entity
      MarshallingDirectives.entity(as[User]) {
        user =>
          complete(s"no=${user.no}")
      }
    }
  }

  describe("Our route should") {

    val json = """ {"name" : "bender", "no" : 1234} """

    it("submit a json") {
      Put("/user", HttpEntity(`application/json`,json)) ~> putOrder ~> check {
        responseAs[String] should equal("no=1234")
      }
    }
    it("Submit text") {
      Put("/user", HttpEntity(`text/plain`,"""User(Zoidberg,322)""")) ~> putOrder ~> check {
        responseAs[String] should equal("no=322")
      }
    }
  }
}