1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Web.Plugs.MappedSignatureToIdentityPlug do
6 alias Pleroma.Helpers.AuthHelper
7 alias Pleroma.Signature
9 alias Pleroma.Web.ActivityPub.Utils
14 def init(options), do: options
16 def call(%{assigns: %{user: %User{}}} = conn, _opts), do: conn
18 # if this has payload make sure it is signed by the same actor that made it
19 def call(%{assigns: %{valid_signature: true}, params: %{"actor" => actor}} = conn, _opts) do
20 with actor_id <- Utils.get_ap_id(actor),
21 {:user, %User{} = user} <- {:user, user_from_key_id(conn)},
22 {:user_match, true} <- {:user_match, user.ap_id == actor_id} do
24 |> assign(:user, user)
25 |> AuthHelper.skip_oauth()
27 {:user_match, false} ->
28 Logger.debug("Failed to map identity from signature (payload actor mismatch)")
29 Logger.debug("key_id=#{inspect(key_id_from_conn(conn))}, actor=#{inspect(actor)}")
30 assign(conn, :valid_signature, false)
32 # remove me once testsuite uses mapped capabilities instead of what we do now
34 Logger.debug("Failed to map identity from signature (lookup failure)")
35 Logger.debug("key_id=#{inspect(key_id_from_conn(conn))}, actor=#{actor}")
40 # no payload, probably a signed fetch
41 def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
42 with %User{} = user <- user_from_key_id(conn) do
44 |> assign(:user, user)
45 |> AuthHelper.skip_oauth()
48 Logger.debug("Failed to map identity from signature (no payload actor mismatch)")
49 Logger.debug("key_id=#{inspect(key_id_from_conn(conn))}")
50 assign(conn, :valid_signature, false)
55 def call(conn, _opts), do: conn
57 defp key_id_from_conn(conn) do
58 with %{"keyId" => key_id} <- HTTPSignatures.signature_for_conn(conn),
59 {:ok, ap_id} <- Signature.key_id_to_actor_id(key_id) do
67 defp user_from_key_id(conn) do
68 with key_actor_id when is_binary(key_actor_id) <- key_id_from_conn(conn),
69 {:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(key_actor_id) do