Impersonate.scala

def impersonate(username: String): Future[(String, Duration)] = {
  for {
    impersonatorToken <- obtainImpersonatorToken()
    userId <- getUserId(username, impersonatorToken)
    impersonatedUserCookies <- impersonateUser(impersonatorToken, userId)
    userTokenAndTtl <- obtainTokenBasedOnIdentity(impersonatedUserCookies)
  } yield userTokenAndTtl
}