Generates a module for authenticating requests based on the Plug.Conn.

Example

defmodule MyAppWeb.Authentication do
  use Authenticator, fallback: MyAppWeb.FallbackController

  alias MyApp.Repo
  alias MyApp.Accounts.User

  @impl true
  def tokenize(user) do
    {:ok, to_string(user.id)}
  end

  @impl true
  def authenticate(user_id) do
    case Repo.get(User, user_id) do
      nil ->
        {:error, :unauthenticated}

      user ->
        {:ok, user}
    end
  end
end