1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Web.Plugs.MappedSignatureToIdentityPlug do
6 alias Pleroma.Signature
8 alias Pleroma.Web.ActivityPub.Utils
13 def init(options), do: options
15 defp key_id_from_conn(conn) do
16 with %{"keyId" => key_id} <- HTTPSignatures.signature_for_conn(conn),
17 {:ok, ap_id} <- Signature.key_id_to_actor_id(key_id) do
25 defp user_from_key_id(conn) do
26 with key_actor_id when is_binary(key_actor_id) <- key_id_from_conn(conn),
27 {:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(key_actor_id) do
35 def call(%{assigns: %{user: _}} = conn, _opts), do: conn
37 # if this has payload make sure it is signed by the same actor that made it
38 def call(%{assigns: %{valid_signature: true}, params: %{"actor" => actor}} = conn, _opts) do
39 with actor_id <- Utils.get_ap_id(actor),
40 {:user, %User{} = user} <- {:user, user_from_key_id(conn)},
41 {:user_match, true} <- {:user_match, user.ap_id == actor_id} do
42 assign(conn, :user, user)
44 {:user_match, false} ->
45 Logger.debug("Failed to map identity from signature (payload actor mismatch)")
46 Logger.debug("key_id=#{inspect(key_id_from_conn(conn))}, actor=#{inspect(actor)}")
47 assign(conn, :valid_signature, false)
49 # remove me once testsuite uses mapped capabilities instead of what we do now
51 Logger.debug("Failed to map identity from signature (lookup failure)")
52 Logger.debug("key_id=#{inspect(key_id_from_conn(conn))}, actor=#{actor}")
57 # no payload, probably a signed fetch
58 def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
59 with %User{} = user <- user_from_key_id(conn) do
60 assign(conn, :user, user)
63 Logger.debug("Failed to map identity from signature (no payload actor mismatch)")
64 Logger.debug("key_id=#{inspect(key_id_from_conn(conn))}")
65 assign(conn, :valid_signature, false)
70 def call(conn, _opts), do: conn