Restrict access to specific IP in Play Framework (Scala)

How can I restrict access to list of IP in Play Framework using Scala?

I'm using Play Framework 2.2.4

I found solution for Java: http://feadro.com/simple-ip-access-list-for-play-2-1-with-java/

How should I do it in Scala?

Stick the IPs you want to restrict to in the application.conf.

myapp.ipwhitelist = ["192.168.1.1", ...]

Then make a global filter which is applied to every incoming request, something like:

import scala.collection.JavaConverters._
import play.api.libs.concurrent.Execution.Implicits._
import play.api.libs.iteratee.Iteratee
import play.api.Play.current
import play.api.mvc._

object IPFilter extends EssentialFilter {
  def apply(nextFilter: EssentialAction) = new EssentialAction {
    def apply(requestHeader: RequestHeader) = {
      // read the IPs as a Scala Seq (converting from the Java list)
      val ips: Seq[String] = current.configuration.getStringList("myapp.ipwhitelist")
            .map(_.asScala).getOrElse(Seq.empty)

      // Check we've got an allowed IP, otherwise ignore the
      // request body and immediately return a forbidden.
      if (ips.contains(requestHeader.remoteAddress)) nextFilter(requestHeader)
      else Iteratee.ignore[Array[Byte]]
        .map(_ => Results.Forbidden(s"Bad IP! ${requestHeader.remoteAddress}"))
    }
  }
}

Then enable that in your application Global object:

object Global extends WithFilters(IPFilter) with GlobalSettings

If you want more flexibility you can use the same logic but with Action composition instead of a global filter.