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# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Federator do
use GenServer
alias Pleroma.User
alias Pleroma.Activity
alias Pleroma.Web.{WebFinger, Websub, Salmon}
alias Pleroma.Web.Federator.RetryQueue
alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Web.ActivityPub.Relay
alias Pleroma.Web.ActivityPub.Transmogrifier
alias Pleroma.Web.ActivityPub.Utils
alias Pleroma.Web.OStatus
require Logger
@websub Application.get_env(:pleroma, :websub)
@ostatus Application.get_env(:pleroma, :ostatus)
def init(args) do
{:ok, args}
end
def start_link do
spawn(fn ->
# 1 minute
Process.sleep(1000 * 60 * 1)
enqueue(:refresh_subscriptions, nil)
end)
GenServer.start_link(
__MODULE__,
%{
in: {:sets.new(), []},
out: {:sets.new(), []}
},
name: __MODULE__
)
end
def handle(:refresh_subscriptions, _) do
Logger.debug("Federator running refresh subscriptions")
Websub.refresh_subscriptions()
spawn(fn ->
# 6 hours
Process.sleep(1000 * 60 * 60 * 6)
enqueue(:refresh_subscriptions, nil)
end)
end
def handle(:request_subscription, websub) do
Logger.debug("Refreshing #{websub.topic}")
with {:ok, websub} <- Websub.request_subscription(websub) do
Logger.debug("Successfully refreshed #{websub.topic}")
else
_e -> Logger.debug("Couldn't refresh #{websub.topic}")
end
end
def handle(:publish, activity) do
Logger.debug(fn -> "Running publish for #{activity.data["id"]}" end)
with actor when not is_nil(actor) <- User.get_cached_by_ap_id(activity.data["actor"]) do
{:ok, actor} = WebFinger.ensure_keys_present(actor)
if ActivityPub.is_public?(activity) do
if OStatus.is_representable?(activity) do
Logger.info(fn -> "Sending #{activity.data["id"]} out via WebSub" end)
Websub.publish(Pleroma.Web.OStatus.feed_path(actor), actor, activity)
Logger.info(fn -> "Sending #{activity.data["id"]} out via Salmon" end)
Pleroma.Web.Salmon.publish(actor, activity)
end
if Keyword.get(Application.get_env(:pleroma, :instance), :allow_relay) do
Logger.info(fn -> "Relaying #{activity.data["id"]} out" end)
Relay.publish(activity)
end
end
Logger.info(fn -> "Sending #{activity.data["id"]} out via AP" end)
Pleroma.Web.ActivityPub.ActivityPub.publish(actor, activity)
end
end
def handle(:verify_websub, websub) do
Logger.debug(fn ->
"Running WebSub verification for #{websub.id} (#{websub.topic}, #{websub.callback})"
end)
@websub.verify(websub)
end
def handle(:incoming_doc, doc) do
Logger.info("Got document, trying to parse")
@ostatus.handle_incoming(doc)
end
def handle(:incoming_ap_doc, params) do
Logger.info("Handling incoming AP activity")
params = Utils.normalize_params(params)
# 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} <- ap_enabled_actor(params["actor"]),
nil <- Activity.normalize(params["id"]),
:ok <- Transmogrifier.contain_origin_from_id(params["actor"], params),
{:ok, activity} <- Transmogrifier.handle_incoming(params) do
{:ok, activity}
else
%Activity{} ->
Logger.info("Already had #{params["id"]}")
:error
_e ->
# Just drop those for now
Logger.info("Unhandled activity")
Logger.info(Poison.encode!(params, pretty: 2))
:error
end
end
def handle(:publish_single_salmon, params) do
Salmon.send_to_user(params)
end
def handle(:publish_single_ap, params) do
case ActivityPub.publish_one(params) do
{:ok, _} ->
:ok
{:error, _} ->
RetryQueue.enqueue(params, ActivityPub)
end
end
def handle(
:publish_single_websub,
%{xml: _xml, topic: _topic, callback: _callback, secret: _secret} = params
) do
case Websub.publish_one(params) do
{:ok, _} ->
:ok
{:error, _} ->
RetryQueue.enqueue(params, Websub)
end
end
def handle(type, _) do
Logger.debug(fn -> "Unknown task: #{type}" end)
{:error, "Don't know what to do with this"}
end
if Mix.env() == :test do
def enqueue(type, payload, _priority \\ 1) do
if Pleroma.Config.get([:instance, :federating]) do
handle(type, payload)
end
end
else
def enqueue(type, payload, priority \\ 1) do
if Pleroma.Config.get([:instance, :federating]) do
GenServer.cast(__MODULE__, {:enqueue, type, payload, priority})
end
end
end
def maybe_start_job(running_jobs, queue) do
if :sets.size(running_jobs) < Pleroma.Config.get([__MODULE__, :max_jobs]) && queue != [] do
{{type, payload}, queue} = queue_pop(queue)
{:ok, pid} = Task.start(fn -> handle(type, payload) end)
mref = Process.monitor(pid)
{:sets.add_element(mref, running_jobs), queue}
else
{running_jobs, queue}
end
end
def handle_cast({:enqueue, type, payload, _priority}, state)
when type in [:incoming_doc, :incoming_ap_doc] do
%{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}} = state
i_queue = enqueue_sorted(i_queue, {type, payload}, 1)
{i_running_jobs, i_queue} = maybe_start_job(i_running_jobs, i_queue)
{:noreply, %{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}}}
end
def handle_cast({:enqueue, type, payload, _priority}, state) do
%{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}} = state
o_queue = enqueue_sorted(o_queue, {type, payload}, 1)
{o_running_jobs, o_queue} = maybe_start_job(o_running_jobs, o_queue)
{:noreply, %{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}}}
end
def handle_cast(m, state) do
IO.inspect("Unknown: #{inspect(m)}, #{inspect(state)}")
{:noreply, state}
end
def handle_info({:DOWN, ref, :process, _pid, _reason}, state) do
%{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}} = state
i_running_jobs = :sets.del_element(ref, i_running_jobs)
o_running_jobs = :sets.del_element(ref, o_running_jobs)
{i_running_jobs, i_queue} = maybe_start_job(i_running_jobs, i_queue)
{o_running_jobs, o_queue} = maybe_start_job(o_running_jobs, o_queue)
{:noreply, %{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}}}
end
def enqueue_sorted(queue, element, priority) do
[%{item: element, priority: priority} | queue]
|> Enum.sort_by(fn %{priority: priority} -> priority end)
end
def queue_pop([%{item: element} | queue]) do
{element, queue}
end
def ap_enabled_actor(id) do
user = User.get_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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