# Pleroma: A lightweight social networking server # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Web.Streamer 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.MastodonAPI.NotificationView @keepalive_interval :timer.seconds(30) def start_link do GenServer.start_link(__MODULE__, %{}, name: __MODULE__) end def add_socket(topic, socket) do GenServer.cast(__MODULE__, %{action: :add, socket: socket, topic: topic}) end def remove_socket(topic, socket) do GenServer.cast(__MODULE__, %{action: :remove, socket: socket, topic: topic}) end def stream(topic, item) do GenServer.cast(__MODULE__, %{action: :stream, topic: topic, item: item}) end def init(args) do spawn(fn -> # 30 seconds Process.sleep(@keepalive_interval) GenServer.cast(__MODULE__, %{action: :ping}) end) {:ok, args} end def handle_cast(%{action: :ping}, topics) do Map.values(topics) |> List.flatten() |> Enum.each(fn socket -> Logger.debug("Sending keepalive ping") send(socket.transport_pid, {:text, ""}) end) spawn(fn -> # 30 seconds Process.sleep(@keepalive_interval) GenServer.cast(__MODULE__, %{action: :ping}) end) {:noreply, topics} end def handle_cast(%{action: :stream, topic: "direct", item: item}, topics) 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(topics, user_topic, item) end) {:noreply, topics} end def handle_cast(%{action: :stream, topic: "participation", item: participation}, topics) do user_topic = "direct:#{participation.user_id}" Logger.debug("Trying to push a conversation participation to #{user_topic}\n\n") push_to_socket(topics, user_topic, participation) {:noreply, topics} end def handle_cast(%{action: :stream, topic: "list", item: item}, topics) 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(topics, list_topic, item) end) {:noreply, topics} end def handle_cast( %{action: :stream, topic: topic, item: %Notification{} = item}, topics ) when topic in ["user", "user:notification"] do topics |> Map.get("#{topic}:#{item.user_id}", []) |> Enum.each(fn socket -> send( socket.transport_pid, {:text, represent_notification(socket.assigns[:user], item)} ) end) {:noreply, topics} end def handle_cast(%{action: :stream, topic: "user", item: item}, topics) 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(topics, topic, item) end) {:noreply, topics} end def handle_cast(%{action: :stream, topic: topic, item: item}, topics) do Logger.debug("Trying to push to #{topic}") Logger.debug("Pushing item to #{topic}") push_to_socket(topics, topic, item) {:noreply, topics} end def handle_cast(%{action: :add, topic: topic, socket: socket}, sockets) do topic = internal_topic(topic, socket) sockets_for_topic = sockets[topic] || [] sockets_for_topic = Enum.uniq([socket | sockets_for_topic]) sockets = Map.put(sockets, topic, sockets_for_topic) Logger.debug("Got new conn for #{topic}") {:noreply, sockets} end def handle_cast(%{action: :remove, topic: topic, socket: socket}, sockets) do topic = internal_topic(topic, socket) sockets_for_topic = sockets[topic] || [] sockets_for_topic = List.delete(sockets_for_topic, socket) sockets = Map.put(sockets, topic, sockets_for_topic) Logger.debug("Removed conn for #{topic}") {:noreply, sockets} end def handle_cast(m, state) do Logger.info("Unknown: #{inspect(m)}, #{inspect(state)}") {:noreply, state} end defp represent_update(%Activity{} = activity, %User{} = user) do %{ event: "update", payload: Pleroma.Web.MastodonAPI.StatusView.render( "status.json", activity: activity, for: user ) |> Jason.encode!() } |> Jason.encode!() end defp represent_update(%Activity{} = activity) do %{ event: "update", payload: Pleroma.Web.MastodonAPI.StatusView.render( "status.json", activity: activity ) |> Jason.encode!() } |> Jason.encode!() end def represent_conversation(%Participation{} = participation) do %{ event: "conversation", payload: Pleroma.Web.MastodonAPI.ConversationView.render("participation.json", %{ participation: participation, user: participation.user }) |> Jason.encode!() } |> Jason.encode!() end @spec represent_notification(User.t(), Notification.t()) :: binary() defp represent_notification(%User{} = user, %Notification{} = notify) do %{ event: "notification", payload: NotificationView.render( "show.json", %{notification: notify, for: user} ) |> Jason.encode!() } |> Jason.encode!() end def push_to_socket(topics, topic, %Activity{data: %{"type" => "Announce"}} = item) do Enum.each(topics[topic] || [], fn socket -> # Get the current user so we have up-to-date blocks etc. if socket.assigns[:user] do user = User.get_cached_by_ap_id(socket.assigns[:user].ap_id) blocks = user.info.blocks || [] mutes = user.info.mutes || [] reblog_mutes = user.info.muted_reblogs || [] with parent when not is_nil(parent) <- Object.normalize(item), true <- Enum.all?([blocks, mutes, reblog_mutes], &(item.actor not in &1)), true <- Enum.all?([blocks, mutes], &(parent.data["actor"] not in &1)), true <- thread_containment(item, user) do send(socket.transport_pid, {:text, represent_update(item, user)}) end else send(socket.transport_pid, {:text, represent_update(item)}) end end) end def push_to_socket(topics, topic, %Participation{} = participation) do Enum.each(topics[topic] || [], fn socket -> send(socket.transport_pid, {:text, represent_conversation(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 socket -> send( socket.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 socket -> # Get the current user so we have up-to-date blocks etc. if socket.assigns[:user] do user = User.get_cached_by_ap_id(socket.assigns[:user].ap_id) blocks = user.info.blocks || [] mutes = user.info.mutes || [] with true <- Enum.all?([blocks, mutes], &(item.actor not in &1)), true <- thread_containment(item, user) do send(socket.transport_pid, {:text, represent_update(item, user)}) end else send(socket.transport_pid, {:text, represent_update(item)}) end end) end defp internal_topic(topic, socket) when topic in ~w[user user:notification direct] do "#{topic}:#{socket.assigns[:user].id}" end defp internal_topic(topic, _), do: topic @spec thread_containment(Activity.t(), User.t()) :: boolean() defp thread_containment(_activity, %User{info: %{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