I’m wanting to put a few static files behind auth so they aren’t available to the public and only available to authorized users.

I put together a plug using Plug.Builder:

defmodule MyApp.PrivateStaticPlug do
  @moduledoc """
  Serves static files to authenticated users.
  """
  use Plug.Builder

  plug(MyApp.AuthPlug)

  plug(Plug.Static,
    at: "/private",
    from: {:my_app, "priv/private_static"},
    gzip: false
  )

  plug(:not_found)

  def not_found(conn, _) do
    conn
    |> send_resp(404, "Not found")
    |> halt()
  end
end

And then I can reference the plug in my app’s endpoint:

plug(MyApp.PrivateStaticPlug)

However, it would be nicer if I could set the options in the endpoint.ex and pass them into the plug. I tried this:

  plug(Plug.Static)

  def call(conn, opts) do
    conn
    |> super(opts)
    |> assign(:called_all_plugs, true)
  end

But overriding the call/2 doesn’t work for Plug.Static because Plug.Static requires options at compile time. Is there a way to do this?