Route Params in Composed Actions

MyAction.scala

package com.example

import javax.inject.Inject

import play.api.i18n.MessagesApi
import play.api.mvc._

import scala.concurrent.Future

// note: `messagesApi` could be anything, it's just quite likely that your controller
// will require things other than what is being passed from the route
class MyAction(someParam: String, messagesApi: MessagesApi) extends ActionBuilder[Request] {

  override def invokeBlock[A](request: Request[A], block: (Request[A]) => Future[Result]): Future[Result] = {
    // do something with someParam
    block(request)
  }
}

class MyActionFactory @Inject() (messagesApi: MessagesApi) {
  def apply(someParam: String): MyAction = new MyAction(someParam, messagesApi)
}

MyController.scala

package com.example

import javax.inject.Inject
import play.api.mvc._

class MyController @Inject() (myAction: MyActionFactory) extends Controller {
  
  def foo(someParam: String): Action[AnyContent] = myAction(someParam) {
    implicit request =>
      NoContent
  }
}

test.routes

GET             /:someParam             MyController.foo(someParam)