112 lines
3.5 KiB
Elixir
112 lines
3.5 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.Federator do
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alias Pleroma.Activity
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alias Pleroma.Object.Containment
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alias Pleroma.User
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alias Pleroma.Web.ActivityPub.ActivityPub
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alias Pleroma.Web.ActivityPub.Transmogrifier
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alias Pleroma.Web.ActivityPub.Utils
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alias Pleroma.Web.Federator.Publisher
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alias Pleroma.Workers.PublisherWorker
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alias Pleroma.Workers.ReceiverWorker
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require Logger
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@doc """
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Returns `true` if the distance to target object does not exceed max configured value.
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Serves to prevent fetching of very long threads, especially useful on smaller instances.
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Addresses [memory leaks on recursive replies fetching](https://git.pleroma.social/pleroma/pleroma/issues/161).
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Applies to fetching of both ancestor (reply-to) and child (reply) objects.
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"""
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# credo:disable-for-previous-line Credo.Check.Readability.MaxLineLength
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def allowed_thread_distance?(distance) do
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max_distance = Pleroma.Config.get([:instance, :federation_incoming_replies_max_depth])
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if max_distance && max_distance >= 0 do
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# Default depth is 0 (an object has zero distance from itself in its thread)
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(distance || 0) <= max_distance
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else
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true
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end
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end
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# Client API
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def incoming_ap_doc(params) do
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ReceiverWorker.enqueue("incoming_ap_doc", %{"params" => params})
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end
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def publish(%{id: "pleroma:fakeid"} = activity) do
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perform(:publish, activity)
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end
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def publish(activity) do
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PublisherWorker.enqueue("publish", %{"activity_id" => activity.id})
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end
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# Job Worker Callbacks
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@spec perform(atom(), module(), any()) :: {:ok, any()} | {:error, any()}
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def perform(:publish_one, module, params) do
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apply(module, :publish_one, [params])
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end
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def perform(:publish, activity) do
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Logger.debug(fn -> "Running publish for #{activity.data["id"]}" end)
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with %User{} = actor <- User.get_cached_by_ap_id(activity.data["actor"]),
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{:ok, actor} <- User.ensure_keys_present(actor) do
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Publisher.publish(actor, activity)
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end
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end
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def perform(:incoming_ap_doc, params) do
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Logger.debug("Handling incoming AP activity")
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actor =
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params
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|> Map.get("actor")
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|> Utils.get_ap_id()
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# NOTE: we use the actor ID to do the containment, this is fine because an
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# actor shouldn't be acting on objects outside their own AP server.
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with {_, {:ok, _user}} <- {:actor, ap_enabled_actor(actor)},
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nil <- Activity.normalize(params["id"]),
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{_, :ok} <-
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{:correct_origin?, Containment.contain_origin_from_id(actor, params)},
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{:ok, activity} <- Transmogrifier.handle_incoming(params) do
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{:ok, activity}
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else
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{:correct_origin?, _} ->
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Logger.debug("Origin containment failure for #{params["id"]}")
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{:error, :origin_containment_failed}
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%Activity{} ->
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Logger.debug("Already had #{params["id"]}")
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{:error, :already_present}
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{:actor, e} ->
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Logger.debug("Unhandled actor #{actor}, #{inspect(e)}")
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{:error, e}
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e ->
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# Just drop those for now
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Logger.debug(fn -> "Unhandled activity\n" <> Jason.encode!(params, pretty: true) end)
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{:error, e}
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end
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end
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def ap_enabled_actor(id) do
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user = User.get_cached_by_ap_id(id)
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if User.ap_enabled?(user) do
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{:ok, user}
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else
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ActivityPub.make_user_from_ap_id(id)
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end
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end
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end
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