make provider config simpler

lib/policy_service_web/plugs/authentication_plug.ex

@@ -14,33 +14,20 @@ defmodule PolicyServiceWeb.Plugs.AuthenticationPlug do
 
   ## Options
   - :provider - The OIDCC provider configuration worker name (required)
-  - :client_id - OAuth2 client ID (required) - can be a string or {module, function, args} tuple
-  - :client_secret - OAuth2 client secret (required) - can be a string or {module, function, args} tuple
-  - :required_scopes - List of required scopes (optional)
   """
   def init(opts) do
     provider = Keyword.fetch!(opts, :provider)
-    client_id = Keyword.fetch!(opts, :client_id)
-    client_secret = Keyword.fetch!(opts, :client_secret)
-    required_scopes = Keyword.get(opts, :required_scopes, [])
+
+    zitadel_config = Application.get_env(:policy_service, :zitadel, [])
 
     %{
       provider: provider,
-      client_id: resolve_config(client_id),
-      client_secret: resolve_config(client_secret),
-      required_scopes: required_scopes
+      client_id: Keyword.get(zitadel_config, :client_id),
+      client_secret: Keyword.get(zitadel_config, :client_secret),
+      required_scopes: Keyword.get(zitadel_config, :required_scopes, [])
     }
   end
 
-  defp resolve_config({module, function, args})
-       when is_atom(module) and is_atom(function) and is_list(args) do
-    apply(module, function, args)
-  end
-
-  defp resolve_config(value) when is_binary(value), do: value
-  defp resolve_config(value) when is_function(value, 0), do: value.()
-  defp resolve_config(value), do: value
-
   @doc """
   Authenticates the request by validating the JWT token.