akka-http validate path param with reusable directive

solution.scala

// https://stackoverflow.com/questions/65669069/akka-http-validate-path-segment

import akka.http.scaladsl.model.Uri.Path
import akka.http.scaladsl.server.{Directive, Rejection}
import com.exabeam.scheduler.models.AppErrors
import org.bson.types.ObjectId

final case class MalformedPathParamRejection(parameterName: String, errorMsg: String) extends Rejection

object ValidatedObjectId {
  def apply(directive: Directive1[String]): Directive1[String] = {
    directive.filter(ObjectId.isValid, MalformedPathParamRejection("userId", "Got invalid userId"))
  }
}

val complexRoute: Route = ValidatedObjectId(path(Segment)) { userId =>
  get {
    complete(StatusCodes.OK, s"Got userId: $userId")
  } ~
  post {
    complete(StatusCodes.OK)
  }
}