Example of how types could work together in toybox

tb.scala

package controllers

import play.api._
import play.api.mvc._
import play.api.mvc.Results._

/** Imagine that the stuff inside this package is the toybox plugin code */
package toybox {

  /**
   * ToyBox. This is the only type the client app has to care about. To use it:
   *  
   *  1. Mix it in with an object in the real application (e.g. object MyToyBox extends ToyBox)
   *  2. Route the ToyBox controllers to whatever routes you want in your routes file, e.g.
   *     GET /login MyToyBox.Controllers.getLogin
   *     POST /login MyToyBox.Controllers.postLogin
   *  3. Implement the abstract members getLogin and postLogin using the reverse router, e.g.
   *  4. Enable the plugin located at MyToyBox.Plugin
   */
  trait ToyBox extends TBRoutes with TBPlugin with TBControllers

  trait TBRoutes {
    def getLogin: Call
    def postLogin: Call
  }

  /** This provides the Global plugin object MyToyBox.Plugin */
  trait TBPlugin { this: TBRoutes =>
    
    object Plugin extends GlobalSettings {
      override def onRouteRequest(request: RequestHeader): Option[Handler] = {
        if (!isAuthorized(request)) {
          Some(Action(Redirect(getLogin)))
        } else {
          super.onRouteRequest(request)
        }
      }

      private def isAuthorized(request: RequestHeader): Boolean = {
        // let's pretend this actually had an implementation
        false
      }
    }
  }

  /** This provides the login controllers: MyToyBox.Controllers */
  trait TBControllers { this: TBRoutes =>
    object Controllers extends Controller {
      def getLogin = Action {
        Ok("In a perfect world I would be a web-page with login forms instead of a string")
      }

      def postLogin = Action {
        Redirect("/in-a-perfect-world-id-be-a-protected-resource-or-the-toybox-login-page-with-errors")
      }
    }
  }
}

// Now we're back in client app land. Let's use the ToyBox plugin.
import toybox.ToyBox

object MyToyBox extends ToyBox {
  override def getLogin = controllers.routes.MyToyBox.Controllers.getLogin
  override def postLogin = controllers.routes.MyToyBox.Controllers.postLogin
}

/* Routes look like this:
GET     /login                      controllers.MyToyBox.Controllers.getLogin
POST    /login                      controllers.MyToyBox.Controllers.postLogin
*/