perspective

defmodule Perspective.Core.Authenticator do
  def authenticate_request(request, token) do
    token
    |> retrieve_actor
    |> attach_to_request(request)
  end

  defp retrieve_actor(""), do: %Perspective.Core.User{id: "user/anonymous"}
  defp retrieve_actor(nil), do: %Perspective.Core.User{id: "user/anonymous"}
  # User not found
  defp retrieve_actor({:error, error}), do: {:error, error}

  defp retrieve_actor(token) do
    Perspective.Core.Guardian.decode_and_verify(token)
    |> case do
      {:ok, claims} -> Perspective.Core.Guardian.resource_from_claims(claims)
      {:error, error} -> {:error, %Perspective.Authentication.TokenError{error: error}}
    end
  end

  defp attach_to_request({:error, error}, _request) do
    {:error, error}
  end

  defp attach_to_request(%{id: id}, request) do
    Map.put(request, :actor_id, id)
  end
end