1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
13 def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
17 def call(conn, _opts) do
19 |> maybe_assign_valid_signature()
20 |> maybe_require_signature()
23 defp maybe_assign_valid_signature(conn) do
24 if has_signature_header?(conn) do
25 # set (request-target) header to the appropriate value
26 # we also replace the digest header with the one we computed
27 request_target = String.downcase("#{conn.method}") <> " #{conn.request_path}"
31 |> put_req_header("(request-target)", request_target)
33 %{assigns: %{digest: digest}} = conn -> put_req_header(conn, "digest", digest)
37 assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
39 Logger.debug("No signature header!")
44 defp has_signature_header?(conn) do
45 conn |> get_req_header("signature") |> Enum.at(0, false)
48 defp maybe_require_signature(%{assigns: %{valid_signature: true}} = conn), do: conn
50 defp maybe_require_signature(conn) do
51 if Pleroma.Config.get([:activitypub, :authorized_fetch_mode], false) do
53 |> put_status(:unauthorized)
54 |> Phoenix.Controller.text("Request not signed")