lib/powerdnsex/config.ex


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defmodule PowerDNSex.Config do
  defstruct url: "",
            token: ""

  alias PowerDNSex.Config

  def data do
    set_attr_value = &Map.put(&2, &1, get_key(&1))

    %Config{}
    |> Map.from_struct()
    |> Map.keys()
    |> Enum.reduce(%Config{}, set_attr_value)
  end

  def powerdns_url do
    url = data().url
    if String.ends_with?(url, "/"), do: url, else: url <> "/"
  end

  def powerdns_token, do: data().token

  def valid?(), do: powerdns_url() && powerdns_token()

  ###
  # Private
  ###

  defp get_key(key) do
    case Application.fetch_env(:powerdnsex, key) do
      {:ok, {:system, env_var_name}} ->
        System.get_env(env_var_name)

      {:ok, value} ->
        value

      _ ->
        raise "[PowerDNSex] PowerDNS #{Atom.to_string(key)} not configured."
    end
  end
end