load config from server instead of config file

lib/myapp_web/controllers/config_controller.ex

@@ -0,0 +1,15 @@
+defmodule MyAppWeb.ConfigController do
+  use MyAppWeb, :controller
+  alias MyAppWeb.Response
+  alias MyApp.Data
+
+  def get_config(conn, _params) do
+    output = %{
+      "client_id": Application.get_env(:myapp, :bnet_client_id),
+      "redirect_uri": Application.get_env(:myapp, :bnet_redirect_uri),
+    }
+    conn
+    |> put_status(200)
+    |> Response.json(output)
+  end
+end