defimpl ExAdmin.Authentication, for: Plug.Conn do
  alias MyApp.Router.Helpers
  alias MyApp.Authentication, as: Auth
  def use_authentication?(_), do: true
  def current_user(conn), do: Auth.current_user(conn)
  def current_user_name(conn), do: Auth.current_user(conn).name
  def session_path(conn, action), do: Helpers.session_path(conn, action)
end
defmodule MyApp.Authentication do
  def current_user(conn) do
    YouFavAuthLib.some_get_authenticated_user(conn)
  end
end