git.squeep.com Git - akkoma/blob - lib/pleroma/plugs/remote_ip.ex

   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Plugs.RemoteIp do
   6   @moduledoc """
   7   This is a shim to call [`RemoteIp`](https://git.pleroma.social/pleroma/remote_ip) but with runtime configuration.
   8   """
   9
  10   @behaviour Plug
  11
  12   @headers ~w[
  13     x-forwarded-for
  14   ]
  15
  16   # https://en.wikipedia.org/wiki/Localhost
  17   # https://en.wikipedia.org/wiki/Private_network
  18   @reserved ~w[
  19     127.0.0.0/8
  20     ::1/128
  21     fc00::/7
  22     10.0.0.0/8
  23     172.16.0.0/12
  24     192.168.0.0/16
  25   ]
  26
  27   def init(_), do: nil
  28
  29   def call(conn, _) do
  30     config = Pleroma.Config.get(__MODULE__, [])
  31
  32     if Keyword.get(config, :enabled, false) do
  33       RemoteIp.call(conn, remote_ip_opts(config))
  34     else
  35       conn
  36     end
  37   end
  38
  39   defp remote_ip_opts(config) do
  40     headers = config |> Keyword.get(:headers, @headers) |> MapSet.new()
  41     reserved = Keyword.get(config, :reserved, @reserved)
  42
  43     proxies =
  44       config
  45       |> Keyword.get(:proxies, [])
  46       |> Enum.concat(reserved)
  47       |> Enum.map(&InetCidr.parse/1)
  48
  49     {headers, proxies}
  50   end
  51 end