CORS Filter in Scala Play 2.2 application

Question

I want to implement a CORS filter in my Play 2.2.x application. So far I have the following:

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

as well as a preflight options action:

  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");
  }

with a route defined:

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

What seems to be happening is that CorsFilter code isn't being executed. I have my debugger open and I don't see any of my requests hitting this filter. Why would this be? Is there somewhere else I need to define the filter stuff so that Play can see it?

Answer 1

The GlobalSettings object needs to be in the default package, so package filters is causing it to be ignored by Play. I'd suggest moving it to it's own file Global.scala.