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# 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(activity) do
PublisherWorker.enqueue("publish", %{"activity_id" => activity.id})
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}
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
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