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nerves lib nerves utils proxy.ex
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lib/nerves/utils/proxy.ex 

defmodule Nerves.Utils.Proxy do

  @moduledoc false

  # Special thanks to Hex.



  @spec config(String.t()) :: [proxy_auth: {charlist(), charlist()}]

  def config(url) do

    {http_proxy, https_proxy} = setup()

    auth(URI.parse(url), http_proxy, https_proxy)

  end



  defp setup() do

    http_proxy = (proxy = System.get_env("HTTP_PROXY")) && set(:http, proxy)

    https_proxy = (proxy = System.get_env("HTTPS_PROXY")) && set(:https, proxy)

    {http_proxy, https_proxy}

  end



  defp set(scheme, proxy) do

    uri = URI.parse(proxy)



    _ =

      if uri.host && uri.port do

        host = String.to_charlist(uri.host)

        :httpc.set_options([{scheme(scheme), {{host, uri.port}, []}}], :nerves)

      end



    uri

  end



  defp scheme(scheme) do

    case scheme do

      :http -> :proxy

      :https -> :https_proxy

    end

  end



  defp auth(%URI{scheme: "http"}, http_proxy, _https_proxy), do: auth(http_proxy)

  defp auth(%URI{scheme: "https"}, _http_proxy, https_proxy), do: auth(https_proxy)



  defp auth(nil), do: []

  defp auth(%URI{userinfo: nil}), do: []



  defp auth(%URI{userinfo: auth}) do

    destructure [user, pass], String.split(auth, ":", parts: 2)



    user = String.to_charlist(user)

    pass = String.to_charlist(pass || "")



    [proxy_auth: {user, pass}]

  end

end