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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Streamer.Worker do
use GenServer
require Logger
alias Pleroma.Activity
alias Pleroma.Config
alias Pleroma.Conversation.Participation
alias Pleroma.Notification
alias Pleroma.Object
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Web.ActivityPub.Visibility
alias Pleroma.Web.CommonAPI
alias Pleroma.Web.Streamer.State
alias Pleroma.Web.Streamer.StreamerSocket
alias Pleroma.Web.StreamerView
def start_link(_) do
GenServer.start_link(__MODULE__, %{}, [])
end
def init(init_arg) do
{:ok, init_arg}
end
def stream(pid, topics, items) do
GenServer.call(pid, {:stream, topics, items})
end
def handle_call({:stream, topics, item}, _from, state) when is_list(topics) do
Enum.each(topics, fn t ->
do_stream(%{topic: t, item: item})
end)
{:reply, state, state}
end
def handle_call({:stream, topic, items}, _from, state) when is_list(items) do
Enum.each(items, fn i ->
do_stream(%{topic: topic, item: i})
end)
{:reply, state, state}
end
def handle_call({:stream, topic, item}, _from, state) do
do_stream(%{topic: topic, item: item})
{:reply, state, state}
end
defp do_stream(%{topic: "direct", item: item}) do
recipient_topics =
User.get_recipients_from_activity(item)
|> Enum.map(fn %{id: id} -> "direct:#{id}" end)
Enum.each(recipient_topics, fn user_topic ->
Logger.debug("Trying to push direct message to #{user_topic}\n\n")
push_to_socket(State.get_sockets(), user_topic, item)
end)
end
defp do_stream(%{topic: "participation", item: participation}) do
user_topic = "direct:#{participation.user_id}"
Logger.debug("Trying to push a conversation participation to #{user_topic}\n\n")
push_to_socket(State.get_sockets(), user_topic, participation)
end
defp do_stream(%{topic: "list", item: item}) do
# filter the recipient list if the activity is not public, see #270.
recipient_lists =
case Visibility.is_public?(item) do
true ->
Pleroma.List.get_lists_from_activity(item)
_ ->
Pleroma.List.get_lists_from_activity(item)
|> Enum.filter(fn list ->
owner = User.get_cached_by_id(list.user_id)
Visibility.visible_for_user?(item, owner)
end)
end
recipient_topics =
recipient_lists
|> Enum.map(fn %{id: id} -> "list:#{id}" end)
Enum.each(recipient_topics, fn list_topic ->
Logger.debug("Trying to push message to #{list_topic}\n\n")
push_to_socket(State.get_sockets(), list_topic, item)
end)
end
defp do_stream(%{topic: topic, item: %Notification{} = item})
when topic in ["user", "user:notification"] do
State.get_sockets()
|> Map.get("#{topic}:#{item.user_id}", [])
|> Enum.each(fn %StreamerSocket{transport_pid: transport_pid, user: socket_user} ->
with %User{} = user <- User.get_cached_by_ap_id(socket_user.ap_id),
true <- should_send?(user, item) do
send(transport_pid, {:text, StreamerView.render("notification.json", socket_user, item)})
end
end)
end
defp do_stream(%{topic: "user", item: item}) do
Logger.debug("Trying to push to users")
recipient_topics =
User.get_recipients_from_activity(item)
|> Enum.map(fn %{id: id} -> "user:#{id}" end)
Enum.each(recipient_topics, fn topic ->
push_to_socket(State.get_sockets(), topic, item)
end)
end
defp do_stream(%{topic: topic, item: item}) do
Logger.debug("Trying to push to #{topic}")
Logger.debug("Pushing item to #{topic}")
push_to_socket(State.get_sockets(), topic, item)
end
defp should_send?(%User{} = user, %Activity{} = item) do
%{block: blocked_ap_ids, mute: muted_ap_ids, reblog_mute: reblog_muted_ap_ids} =
User.outgoing_relationships_ap_ids(user, [:block, :mute, :reblog_mute])
recipient_blocks = MapSet.new(blocked_ap_ids ++ muted_ap_ids)
recipients = MapSet.new(item.recipients)
domain_blocks = Pleroma.Web.ActivityPub.MRF.subdomains_regex(user.domain_blocks)
with parent <- Object.normalize(item) || item,
true <-
Enum.all?([blocked_ap_ids, muted_ap_ids], &(item.actor not in &1)),
true <- item.data["type"] != "Announce" || item.actor not in reblog_muted_ap_ids,
true <- Enum.all?([blocked_ap_ids, muted_ap_ids], &(parent.data["actor"] not in &1)),
true <- MapSet.disjoint?(recipients, recipient_blocks),
%{host: item_host} <- URI.parse(item.actor),
%{host: parent_host} <- URI.parse(parent.data["actor"]),
false <- Pleroma.Web.ActivityPub.MRF.subdomain_match?(domain_blocks, item_host),
false <- Pleroma.Web.ActivityPub.MRF.subdomain_match?(domain_blocks, parent_host),
true <- thread_containment(item, user),
false <- CommonAPI.thread_muted?(user, parent) do
true
else
_ -> false
end
end
defp should_send?(%User{} = user, %Notification{activity: activity}) do
should_send?(user, activity)
end
def push_to_socket(topics, topic, %Activity{data: %{"type" => "Announce"}} = item) do
Enum.each(topics[topic] || [], fn %StreamerSocket{
transport_pid: transport_pid,
user: socket_user
} ->
# Get the current user so we have up-to-date blocks etc.
if socket_user do
user = User.get_cached_by_ap_id(socket_user.ap_id)
if should_send?(user, item) do
send(transport_pid, {:text, StreamerView.render("update.json", item, user)})
end
else
send(transport_pid, {:text, StreamerView.render("update.json", item)})
end
end)
end
def push_to_socket(topics, topic, %Participation{} = participation) do
Enum.each(topics[topic] || [], fn %StreamerSocket{transport_pid: transport_pid} ->
send(transport_pid, {:text, StreamerView.render("conversation.json", participation)})
end)
end
def push_to_socket(topics, topic, %Activity{
data: %{"type" => "Delete", "deleted_activity_id" => deleted_activity_id}
}) do
Enum.each(topics[topic] || [], fn %StreamerSocket{transport_pid: transport_pid} ->
send(
transport_pid,
{:text, %{event: "delete", payload: to_string(deleted_activity_id)} |> Jason.encode!()}
)
end)
end
def push_to_socket(_topics, _topic, %Activity{data: %{"type" => "Delete"}}), do: :noop
def push_to_socket(topics, topic, item) do
Enum.each(topics[topic] || [], fn %StreamerSocket{
transport_pid: transport_pid,
user: socket_user
} ->
# Get the current user so we have up-to-date blocks etc.
if socket_user do
user = User.get_cached_by_ap_id(socket_user.ap_id)
if should_send?(user, item) do
send(transport_pid, {:text, StreamerView.render("update.json", item, user)})
end
else
send(transport_pid, {:text, StreamerView.render("update.json", item)})
end
end)
end
@spec thread_containment(Activity.t(), User.t()) :: boolean()
defp thread_containment(_activity, %User{skip_thread_containment: true}), do: true
defp thread_containment(activity, user) do
if Config.get([:instance, :skip_thread_containment]) do
true
else
ActivityPub.contain_activity(activity, user)
end
end
end
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