-# 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.CommonAPI
- 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
- Process.send_after(self(), %{action: :ping}, @keepalive_interval)
-
- {:ok, args}
- end
-
- def handle_info(%{action: :ping}, topics) do
- topics
- |> Map.values()
- |> List.flatten()
- |> Enum.each(fn socket ->
- Logger.debug("Sending keepalive ping")
- send(socket.transport_pid, {:text, ""})
- end)
-
- Process.send_after(self(), %{action: :ping}, @keepalive_interval)
-
- {: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 ->
- with %User{} = user <- User.get_cached_by_ap_id(socket.assigns[:user].ap_id),
- true <- should_send?(user, item) do
- send(
- socket.transport_pid,
- {:text, represent_notification(socket.assigns[:user], item)}
- )
- end
- 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,
- for: 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
-
- defp should_send?(%User{} = user, %Activity{} = item) do
- blocks = user.info.blocks || []
- mutes = user.info.mutes || []
- reblog_mutes = user.info.muted_reblogs || []
- domain_blocks = Pleroma.Web.ActivityPub.MRF.subdomains_regex(user.info.domain_blocks)
-
- 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)),
- %{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, item) 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 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)
-
- if should_send?(user, item) 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
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