scala3-exports1.scala

// Adapted from Programming Scala, Third Edition code repo:
// https://github.com/deanwampler/programming-scala-book-code-examples/blob/master/src/script/scala/progscala3/basicoop/Exports.scala

import java.net.URL

case class UserName(value: String):
  assert(value.length > 0)
case class Password(value: String):
  assert(value.length > 0)

trait Authenticate:                
  final def apply(
      username: UserName, password: Password): Boolean =
    authenticated = auth(username, password)
    authenticated
  def isAuthenticated: Boolean = authenticated

  private var authenticated = false
  protected def auth(username: UserName, password: Password): Boolean

class DirectoryAuthenticate(location: URL) extends Authenticate:
  protected def auth(username: UserName, password: Password): Boolean = true


object Service:
  private val dirAuthenticate =
    DirectoryAuthenticate(URL("https://directory.wtf"))

  export dirAuthenticate.{apply => authenticate, isAuthenticated}