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56 lines
1.7 KiB
Elixir
56 lines
1.7 KiB
Elixir
defmodule PlausibleWeb.RemoteIp do
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def get(conn) do
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x_plausible_ip = List.first(Plug.Conn.get_req_header(conn, "x-plausible-ip"))
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cf_connecting_ip = List.first(Plug.Conn.get_req_header(conn, "cf-connecting-ip"))
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x_forwarded_for = List.first(Plug.Conn.get_req_header(conn, "x-forwarded-for"))
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b_forwarded_for = List.first(Plug.Conn.get_req_header(conn, "b-forwarded-for"))
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forwarded = List.first(Plug.Conn.get_req_header(conn, "forwarded"))
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cond do
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x_plausible_ip ->
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clean_ip(x_plausible_ip)
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cf_connecting_ip ->
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clean_ip(cf_connecting_ip)
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b_forwarded_for ->
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parse_forwarded_for(b_forwarded_for)
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x_forwarded_for ->
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parse_forwarded_for(x_forwarded_for)
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forwarded ->
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Regex.named_captures(~r/for=(?<for>[^;,]+).*$/, forwarded)
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|> Map.get("for")
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# IPv6 addresses are enclosed in quote marks and square brackets: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Forwarded
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|> String.trim("\"")
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|> clean_ip
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true ->
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to_string(:inet_parse.ntoa(conn.remote_ip))
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end
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end
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# Removes port from both IPv4 and IPv6 addresses. From https://regexr.com/3hpvt
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# Removes surrounding [] of an IPv6 address
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@port_regex ~r/((\.\d+)|(\]))(?<port>:[0-9]+)$/
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defp clean_ip(ip_and_port) do
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ip =
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case Regex.named_captures(@port_regex, ip_and_port) do
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%{"port" => port} -> String.trim_trailing(ip_and_port, port)
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_ -> ip_and_port
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end
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ip
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|> String.trim_leading("[")
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|> String.trim_trailing("]")
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end
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defp parse_forwarded_for(header) do
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String.split(header, ",")
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|> Enum.map(&String.trim/1)
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|> List.first()
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|> clean_ip
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end
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end
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