akka-http：如何 consume/hide 提取值？

Question

我正在尝试编写拒绝 non-ajax 请求的指令。下面的代码显然不起作用：

import akka.http.scaladsl.model.HttpHeader
import akka.http.scaladsl.server.Directive0
import akka.http.scaladsl.server.directives.BasicDirectives
import akka.http.scaladsl.server.directives.HeaderDirectives
import akka.http.scaladsl.server.directives.RouteDirectives

trait AjaxDirectives extends BasicDirectives with HeaderDirectives with RouteDirectives {
  private val valid = "XMLHttpRequest"

  def ajax(): Directive0 = {
    headerValueByName("X-Requested-With") { header ⇒
      if (header == valid) {
        pass
      } else {
        reject
      }
    }
  }
}

(这里有2个问题：pass是Directive0&headerValueByName是Directive1，headerValueByName是Directive1&ajax 是 Directive0。所以它不编译)

我的问题是：我能以某种方式获得局部范围的提取吗？ 就像，header 不会转义 ajax.

我知道我可以访问拉出 header 的请求，而无需使用 headerValue*，所以请不要回答。

Answer 1

阅读SecurityDirectives.authorizeAsync给了我答案：

import akka.http.scaladsl.model.HttpHeader
import akka.http.scaladsl.server.Directive0
import akka.http.scaladsl.server.directives.BasicDirectives
import akka.http.scaladsl.server.directives.HeaderDirectives
import akka.http.scaladsl.server.directives.RouteDirectives

trait AjaxDirectives extends BasicDirectives with HeaderDirectives with RouteDirectives {
  private val headerName = "X-Requested-With"
  private val valid = "XMLHttpRequest"

  def ajax(): Directive0 = {
    headerValueByName(headerName).flatMap { header ⇒
      if (header == valid) {
        pass
      } else {
        reject
      }
    }
  }
}

akka-http：如何 consume/hide 提取值？

akka-http: How can I consume/hide an extracted value?

akka-http

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