135 lines
4.2 KiB
Elixir
135 lines
4.2 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 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.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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@behaviour Pleroma.Web.Federator.Publishing
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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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@impl true
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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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@impl true
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def publish(%{data: %{"object" => object}} = activity) when is_binary(object) do
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PublisherWorker.enqueue("publish", %{"activity_id" => activity.id, "object_data" => nil},
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priority: publish_priority(activity)
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)
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end
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@impl true
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def publish(%{data: %{"object" => object}} = activity) when is_map(object) or is_list(object) do
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PublisherWorker.enqueue(
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"publish",
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%{
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"activity_id" => activity.id,
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"object_data" => Jason.encode!(object)
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},
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priority: publish_priority(activity)
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)
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end
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defp publish_priority(%{data: %{"type" => "Delete"}}), do: 3
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defp publish_priority(_), do: 0
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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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%User{} = actor = User.get_cached_by_ap_id(activity.data["actor"])
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Publisher.publish(actor, activity)
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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 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, _} <- {:local, Containment.contain_local_fetch(actor), actor},
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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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{:local, _, actor} ->
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Logger.alert(
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"Received incoming AP doc with valid signature for local actor #{actor}! Likely key leak!\n#{inspect(params)}"
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)
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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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{:error, {:validate_object, _}} = e ->
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Logger.error("Incoming AP doc validation error: #{inspect(e)}")
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Logger.debug(Jason.encode!(params, pretty: true))
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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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case e do
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{:error, _} -> e
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_ -> {:error, e}
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end
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end
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end
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end
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