# Pleroma: A lightweight social networking server # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Web.Federator do alias Pleroma.Activity alias Pleroma.Object.Containment alias Pleroma.User alias Pleroma.Web.ActivityPub.ActivityPub alias Pleroma.Web.ActivityPub.Transmogrifier alias Pleroma.Web.ActivityPub.Utils alias Pleroma.Web.Federator.Publisher alias Pleroma.Workers.PublisherWorker alias Pleroma.Workers.ReceiverWorker require Logger @behaviour Pleroma.Web.Federator.Publishing @doc """ Returns `true` if the distance to target object does not exceed max configured value. Serves to prevent fetching of very long threads, especially useful on smaller instances. Addresses [memory leaks on recursive replies fetching](https://git.pleroma.social/pleroma/pleroma/issues/161). Applies to fetching of both ancestor (reply-to) and child (reply) objects. """ # credo:disable-for-previous-line Credo.Check.Readability.MaxLineLength def allowed_thread_distance?(distance) do max_distance = Pleroma.Config.get([:instance, :federation_incoming_replies_max_depth]) if max_distance && max_distance >= 0 do # Default depth is 0 (an object has zero distance from itself in its thread) (distance || 0) <= max_distance else true end end # Client API def incoming_ap_doc(params) do ReceiverWorker.enqueue("incoming_ap_doc", %{"params" => params}) end @impl true def publish(%{id: "pleroma:fakeid"} = activity) do perform(:publish, activity) end @impl true def publish(%{data: %{"object" => object}} = activity) when is_binary(object) do PublisherWorker.enqueue("publish", %{"activity_id" => activity.id, "object_data" => nil}) end @impl true def publish(%{data: %{"object" => object}} = activity) when is_map(object) or is_list(object) do PublisherWorker.enqueue("publish", %{ "activity_id" => activity.id, "object_data" => Jason.encode!(object) }) end # Job Worker Callbacks @spec perform(atom(), module(), any()) :: {:ok, any()} | {:error, any()} def perform(:publish_one, module, params) do apply(module, :publish_one, [params]) end def perform(:publish, activity) do Logger.debug(fn -> "Running publish for #{activity.data["id"]}" end) with %User{} = actor <- User.get_cached_by_ap_id(activity.data["actor"]), {:ok, actor} <- User.ensure_keys_present(actor) do Publisher.publish(actor, activity) end end def perform(:incoming_ap_doc, params) do Logger.debug("Handling incoming AP activity") actor = params |> Map.get("actor") |> Utils.get_ap_id() # NOTE: we use the actor ID to do the containment, this is fine because an # actor shouldn't be acting on objects outside their own AP server. with {_, {:ok, _user}} <- {:actor, ap_enabled_actor(actor)}, nil <- Activity.normalize(params["id"]), {_, :ok} <- {:correct_origin?, Containment.contain_origin_from_id(actor, params)}, {:ok, activity} <- Transmogrifier.handle_incoming(params) do {:ok, activity} else {:correct_origin?, _} -> Logger.debug("Origin containment failure for #{params["id"]}") {:error, :origin_containment_failed} %Activity{} -> Logger.debug("Already had #{params["id"]}") {:error, :already_present} {:actor, e} -> Logger.debug("Unhandled actor #{actor}, #{inspect(e)}") {:error, e} {:error, {:validate_object, _}} = e -> Logger.error("Incoming AP doc validation error: #{inspect(e)}") Logger.debug(Jason.encode!(params, pretty: true)) e e -> # Just drop those for now Logger.debug(fn -> "Unhandled activity\n" <> Jason.encode!(params, pretty: true) end) {:error, e} end end def ap_enabled_actor(id) do user = User.get_cached_by_ap_id(id) if User.ap_enabled?(user) do {:ok, user} else ActivityPub.make_user_from_ap_id(id) end end end