Adding CORS Support via Filter to PlayFramework 2.2.1

CORS_step1.scala

// Create the Global class in your /app folder root package:

import play.api.{GlobalSettings, Play}
import play.api.Play.current
import play.api.mvc._

import scala.concurrent.Future
import scala.concurrent.ExecutionContext.Implicits.global

/**
 * Created by terry on 10/19/13.
 */
object Global extends WithFilters(Cors) with GlobalSettings

object Cors extends Filter {

  lazy val config = Play.configuration
  lazy private val allowedOrigins = config.getString("auth.cors.host").getOrElse("http://localhost:8000")

  def apply(f: (RequestHeader) => Future[SimpleResult])(rh: RequestHeader): Future[SimpleResult] = {
    val result = f(rh)
    val origin = rh.headers.get("Origin")
    val defaultAllowed = "http://localhost:8000"
    val hostsAllowed = allowedOrigins.split(", ").toList
    val allowedOrigin = if (origin.isDefined && hostsAllowed.contains(origin.get)) origin.get else defaultAllowed
    // NOTE - the header Access-Control-Allow-Origin won't allow a list of origins - it must be one and only one, so we had to do some magic above...
    result.map(_.withHeaders("Access-Control-Allow-Origin" -> allowedOrigin, "Access-Control-Expose-Headers" -> "WWW-Authenticate, Server-Authorization"))
  }

}

CORS_step2.scala

// add an OPTIONS handler to a controller - Application will do for now
def options(url: String) = Action {
    Ok(Json.obj("results" -> "success")).withHeaders(
      "Access-Control-Allow-Methods" -> "GET, POST, PUT, DELETE, OPTIONS",
      "Access-Control-Allow-Headers" -> "Content-Type, X-Requested-With, Accept, Authorization, User-Agent",
      "Access-Control-Max-Age" -> (60 * 60 * 24).toString
    )
  }

  
// update your routes - list as final route
OPTIONS        /*url                controllers.Application.options(url)