bouncer.ex

#= Bouncers.Bouncer.check_entry(conn, %MyApp.User{})
#=> true

defmodule Bouncers.Bouncer do
  alias Bouncers.Areas

  def check_entry(conn, resource) do
    verify(resource, conn.path_info)
  end

  defp verify(resource, path) do
    try do
      Areas.verify(resource, path)
    rescue
      _ -> false
    end
  end

end

defmodule Bouncers.Doors do

  defmacro bouncer_for(model, allowed_routes) do
    for route <- allowed_routes do
      quote bind_quoted: [route: route, resource: model] do
        def verify(resource, route), do: true
      end
    end
  end
end

defmodule Bouncers.Areas do
  require Bouncers.Doors
  import  Bouncers.Doors

  bouncer_for %MyApp.User{}, [
    ["api", "users"]
  ]
end