mirror of
https://framagit.org/framasoft/mobilizon.git
synced 2024-12-23 16:33:28 +00:00
68 lines
1.9 KiB
Elixir
68 lines
1.9 KiB
Elixir
# Portions of this file are derived from Pleroma:
|
||
# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
|
||
# SPDX-License-Identifier: AGPL-3.0-only
|
||
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/plugs/http_signature.ex
|
||
|
||
defmodule Mobilizon.Web.Plugs.HTTPSignatures do
|
||
@moduledoc """
|
||
Plug to check HTTP Signatures on every incoming request
|
||
"""
|
||
|
||
import Plug.Conn
|
||
|
||
require Logger
|
||
|
||
def init(options) do
|
||
options
|
||
end
|
||
|
||
def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
|
||
conn
|
||
end
|
||
|
||
def call(conn, _opts) do
|
||
case get_req_header(conn, "signature") do
|
||
[signature | _] ->
|
||
if signature do
|
||
# set (request-target) header to the appropriate value
|
||
# we also replace the digest header with the one we computed
|
||
conn =
|
||
conn
|
||
|> put_req_header(
|
||
"(request-target)",
|
||
String.downcase("#{conn.method}") <> " #{conn.request_path}"
|
||
)
|
||
|
||
conn =
|
||
if conn.assigns[:digest] do
|
||
conn
|
||
|> put_req_header("digest", conn.assigns[:digest])
|
||
else
|
||
conn
|
||
end
|
||
|
||
signature_valid = HTTPSignatures.validate_conn(conn)
|
||
Logger.debug("Is signature valid ? #{inspect(signature_valid)}")
|
||
date_valid = date_valid?(conn)
|
||
assign(conn, :valid_signature, signature_valid && date_valid)
|
||
else
|
||
Logger.debug("No signature header!")
|
||
conn
|
||
end
|
||
|
||
_ ->
|
||
conn
|
||
end
|
||
end
|
||
|
||
@spec date_valid?(Plug.Conn.t()) :: boolean()
|
||
defp date_valid?(conn) do
|
||
with [date | _] <- get_req_header(conn, "date") || [""],
|
||
{:ok, date} <- Timex.parse(date, "{WDshort}, {0D} {Mshort} {YYYY} {h24}:{m}:{s} GMT") do
|
||
Timex.diff(date, DateTime.utc_now(), :hours) <= 12 &&
|
||
Timex.diff(date, DateTime.utc_now(), :hours) >= -12
|
||
else
|
||
_ -> false
|
||
end
|
||
end
|
||
end
|