Scala Play 2.2应用程序中的CORS过滤器

时间:2014-06-17 16:54:17

标签: scala playframework-2.0 cors

我想在Play 2.2.x应用程序中实现一个CORS过滤器。到目前为止,我有以下内容:

package filters

import play.api.mvc._
import play.api.libs.concurrent.Execution.Implicits.defaultContext
import play.api.GlobalSettings

class CorsFilter extends EssentialFilter {
  def apply(next: EssentialAction) = new EssentialAction {
    def apply(requestHeader: RequestHeader) = {
      next(requestHeader).map { result =>
        result.withHeaders("Access-Control-Allow-Origin" -> "*",
          "Access-Control-Expose-Headers" -> "WWW-Authenticate, Server-Authorization",
          "Access-Control-Allow-Methods" -> "POST, GET, OPTIONS, PUT, DELETE",
          "Access-Control-Allow-Headers" -> "x-requested-with,content-type,Cache-Control,Pragma,Date")
      }
    }
  }
}

object Global extends WithFilters(new CorsFilter) with GlobalSettings

以及预检选项操作:

  def preflight(all: String) = Action {
    Ok("").withHeaders("Access-Control-Allow-Origin" -> "*",
      "Allow" -> "*",
      "Access-Control-Allow-Methods" -> "POST, GET, PUT, DELETE, OPTIONS",
      "Access-Control-Allow-Headers" -> "Origin, X-Requested-With, Content-Type, Accept, Referrer, User-Agent");
  }

定义了路线:

OPTIONS        /*all                                controllers.Application.preflight(all: String)

似乎正在发生的事情是CorsFilter代码没有被执行。我打开了调试器,但是我没有看到任何请求到达此过滤器。为什么会这样?是否有其他地方我需要定义过滤器的东西,以便Play可以看到它?

2 个答案:

答案 0 :(得分:3)

GlobalSettings对象需要在默认包中,因此package filters会导致Play忽略它。我建议将其移至自己的文件Global.scala

答案 1 :(得分:3)

对于类似的项目,尝试让AngularJS Web客户端与Scala服务器通信,您使用的标头不起作用。我们用过:

    ACCESS_CONTROL_ALLOW_ORIGIN -> "*",
    ACCESS_CONTROL_ALLOW_METHODS -> "GET, POST, OPTIONS",
    ACCESS_CONTROL_ALLOW_HEADERS ->  "Origin, Accept, Authorization, X-Auth-Token",
    ACCESS_CONTROL_ALLOW_CREDENTIALS -> "true"

我们在LimbSoup建议的自己的文件中有了Global对象。我们从https://gist.github.com/jeantil/7214962借用了代码的支柱,但对代码进行了硬编码,而不是以编程方式实现它们。