Who’s Who 

Out of the box HTTP provides you with basic authentication, a simple way to specify a name and password for a request. These credentials are transferred as an unencrypted request header, so applications should secure both credentials and message bodies by requiring HTTPS for any protected resources.

Below, we define a kit that extracts a username and password via basic HTTP authentication and verifies those credentials before letting anyone through the gate. It presumes a Users service that would validate the user’s credentials.

trait Users {
  def auth(u: String, p: String): Boolean
}

import unfiltered.request._
import unfiltered.response._
import unfiltered.Cycle

case class Auth(users: Users) {
  def apply[A,B](intent: Cycle.Intent[A,B]) =
    Cycle.Intent[A,B] {
      case req@BasicAuth(user, pass) if(users.auth(user, pass)) =>
        Cycle.Intent.complete(intent)(req)
      case _ =>
        Unauthorized ~> WWWAuthenticate("""Basic realm="/"""")
    }
}

By applying this kit we can layer basic authentication around any intent in a client application.

case class App(users: Users) extends
unfiltered.filter.Plan {
  def intent = Auth(users) {
    case _ => ResponseString("Shhhh!")
  }
}

Also, don’t give the password to any newspaper reporters.

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