remote_ip.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Plugs.RemoteIp do
	@moduledoc """
	This is a shim to call [`RemoteIp`](https://git.pleroma.social/pleroma/remote_ip) but with runtime configuration.
	"""

	@behaviour Plug

	@headers ~w[
	x-forwarded-for
	]

	# https://en.wikipedia.org/wiki/Localhost
	# https://en.wikipedia.org/wiki/Private_network
	@reserved ~w[
	127.0.0.0/8
	::1/128
	fc00::/7
	10.0.0.0/8
	172.16.0.0/12
	192.168.0.0/16
	]

	def init(_), do: nil

	def call(conn, _) do
	config = Pleroma.Config.get(__MODULE__, [])

	if Keyword.get(config, :enabled, false) do
	RemoteIp.call(conn, remote_ip_opts(config))
	else
	conn
	end
	end

	defp remote_ip_opts(config) do
	headers = config \|> Keyword.get(:headers, @headers) \|> MapSet.new()
	reserved = Keyword.get(config, :reserved, @reserved)

	proxies =
	config
	\|> Keyword.get(:proxies, [])
	\|> Enum.concat(reserved)
	\|> Enum.map(&InetCidr.parse/1)

	{headers, proxies}
	end
	end