debianize-mobilizon/lib/web/plugs/mapped_signature_to_identity.ex

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# Portions of this file are derived from Pleroma:
# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Mobilizon.Web.Plugs.MappedSignatureToIdentity do
@moduledoc """
Get actor identity from Signature when handing fetches
"""
import Plug.Conn
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alias Mobilizon.Actors.Actor
alias Mobilizon.Federation.ActivityPub
alias Mobilizon.Federation.ActivityPub.Utils
alias Mobilizon.Federation.HTTPSignatures.Signature
require Logger
def init(options), do: options
@spec key_id_from_conn(Plug.Conn.t()) :: String.t() | nil
defp key_id_from_conn(conn) do
case HTTPSignatures.signature_for_conn(conn) do
%{"keyId" => key_id} ->
Signature.key_id_to_actor_url(key_id)
_ ->
nil
end
end
@spec actor_from_key_id(Plug.Conn.t()) :: Actor.t() | nil
defp actor_from_key_id(conn) do
with key_actor_id when is_binary(key_actor_id) <- key_id_from_conn(conn),
{:ok, %Actor{} = actor} <- ActivityPub.get_or_fetch_actor_by_url(key_actor_id) do
actor
else
_ ->
nil
end
end
def call(%{assigns: %{actor: _}} = conn, _opts), do: conn
# if this has payload make sure it is signed by the same actor that made it
def call(%{assigns: %{valid_signature: true}, params: %{"actor" => actor}} = conn, _opts) do
with actor_id <- Utils.get_url(actor),
{:actor, %Actor{} = actor} <- {:actor, actor_from_key_id(conn)},
{:actor_match, true} <- {:actor_match, actor.url == actor_id} do
assign(conn, :actor, actor)
else
{:actor_match, false} ->
Logger.debug("Failed to map identity from signature (payload actor mismatch)")
Logger.debug("key_id=#{key_id_from_conn(conn)}, actor=#{actor}")
assign(conn, :valid_signature, false)
# remove me once testsuite uses mapped capabilities instead of what we do now
{:actor, nil} ->
Logger.debug("Failed to map identity from signature (lookup failure)")
Logger.debug("key_id=#{key_id_from_conn(conn)}, actor=#{actor}")
conn
end
end
# no payload, probably a signed fetch
def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
case actor_from_key_id(conn) do
%Actor{} = actor ->
assign(conn, :actor, actor)
_ ->
Logger.debug("Failed to map identity from signature (no payload actor mismatch)")
Logger.debug("key_id=#{key_id_from_conn(conn)}")
assign(conn, :valid_signature, false)
end
end
# no signature at all
def call(conn, _opts), do: conn
end