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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 do
- require Logger
-
- alias Pleroma.Activity
- alias Pleroma.Chat.MessageReference
- 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.StreamerView
-
- @mix_env Mix.env()
- @registry Pleroma.Web.StreamerRegistry
-
- def registry, do: @registry
-
- @public_streams ["public", "public:local", "public:media", "public:local:media"]
- @user_streams ["user", "user:notification", "direct", "user:pleroma_chat"]
-
- @doc "Expands and authorizes a stream, and registers the process for streaming."
- @spec get_topic_and_add_socket(stream :: String.t(), User.t() | nil, Map.t() | nil) ::
- {:ok, topic :: String.t()} | {:error, :bad_topic} | {:error, :unauthorized}
- def get_topic_and_add_socket(stream, user, params \\ %{}) do
- case get_topic(stream, user, params) do
- {:ok, topic} -> add_socket(topic, user)
- error -> error
- end
- end
-
- @doc "Expand and authorizes a stream"
- @spec get_topic(stream :: String.t(), User.t() | nil, Map.t()) ::
- {:ok, topic :: String.t()} | {:error, :bad_topic}
- def get_topic(stream, user, params \\ %{})
-
- # Allow all public steams.
- def get_topic(stream, _, _) when stream in @public_streams do
- {:ok, stream}
- end
-
- # Allow all hashtags streams.
- def get_topic("hashtag", _, %{"tag" => tag}) do
- {:ok, "hashtag:" <> tag}
- end
-
- # Expand user streams.
- def get_topic(stream, %User{} = user, _) when stream in @user_streams do
- {:ok, stream <> ":" <> to_string(user.id)}
- end
-
- def get_topic(stream, _, _) when stream in @user_streams do
- {:error, :unauthorized}
- end
-
- # List streams.
- def get_topic("list", %User{} = user, %{"list" => id}) do
- if Pleroma.List.get(id, user) do
- {:ok, "list:" <> to_string(id)}
- else
- {:error, :bad_topic}
- end
- end
-
- def get_topic("list", _, _) do
- {:error, :unauthorized}
- end
-
- def get_topic(_, _, _) do
- {:error, :bad_topic}
- end
-
- @doc "Registers the process for streaming. Use `get_topic/3` to get the full authorized topic."
- def add_socket(topic, user) do
- if should_env_send?() do
- auth? = if user, do: true
- Registry.register(@registry, topic, auth?)
- end
-
- {:ok, topic}
- end
-
- def remove_socket(topic) do
- if should_env_send?(), do: Registry.unregister(@registry, topic)
- end
-
- def stream(topics, items) do
- if should_env_send?() do
- List.wrap(topics)
- |> Enum.each(fn topic ->
- List.wrap(items)
- |> Enum.each(fn item ->
- spawn(fn -> do_stream(topic, item) end)
- end)
- end)
- end
-
- :ok
- end
-
- def filtered_by_user?(user, item, streamed_type \\ :activity)
-
- def filtered_by_user?(%User{} = user, %Activity{} = item, streamed_type) 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 <-
- !(streamed_type == :activity && item.data["type"] == "Announce" &&
- parent.data["actor"] == user.ap_id),
- 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
- false
- else
- _ -> true
- end
- end
-
- def filtered_by_user?(%User{} = user, %Notification{activity: activity}, _) do
- filtered_by_user?(user, activity, :notification)
- end
-
- defp do_stream("direct", 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(user_topic, item)
- end)
- end
-
- defp do_stream("participation", participation) do
- user_topic = "direct:#{participation.user_id}"
- Logger.debug("Trying to push a conversation participation to #{user_topic}\n\n")
-
- push_to_socket(user_topic, participation)
- end
-
- defp do_stream("list", 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(list_topic, item)
- end)
- end
-
- defp do_stream(topic, %Notification{} = item)
- when topic in ["user", "user:notification"] do
- Registry.dispatch(@registry, "#{topic}:#{item.user_id}", fn list ->
- Enum.each(list, fn {pid, _auth} ->
- send(pid, {:render_with_user, StreamerView, "notification.json", item})
- end)
- end)
- end
-
- defp do_stream(topic, {user, %MessageReference{} = cm_ref})
- when topic in ["user", "user:pleroma_chat"] do
- topic = "#{topic}:#{user.id}"
-
- text = StreamerView.render("chat_update.json", %{chat_message_reference: cm_ref})
-
- Registry.dispatch(@registry, topic, fn list ->
- Enum.each(list, fn {pid, _auth} ->
- send(pid, {:text, text})
- end)
- end)
- end
-
- defp do_stream("user", 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(topic, item)
- end)
- end
-
- defp do_stream(topic, item) do
- Logger.debug("Trying to push to #{topic}")
- Logger.debug("Pushing item to #{topic}")
- push_to_socket(topic, item)
- end
-
- defp push_to_socket(topic, %Participation{} = participation) do
- rendered = StreamerView.render("conversation.json", participation)
-
- Registry.dispatch(@registry, topic, fn list ->
- Enum.each(list, fn {pid, _} ->
- send(pid, {:text, rendered})
- end)
- end)
- end
-
- defp push_to_socket(topic, %Activity{
- data: %{"type" => "Delete", "deleted_activity_id" => deleted_activity_id}
- }) do
- rendered = Jason.encode!(%{event: "delete", payload: to_string(deleted_activity_id)})
-
- Registry.dispatch(@registry, topic, fn list ->
- Enum.each(list, fn {pid, _} ->
- send(pid, {:text, rendered})
- end)
- end)
- end
-
- defp push_to_socket(_topic, %Activity{data: %{"type" => "Delete"}}), do: :noop
-
- defp push_to_socket(topic, item) do
- anon_render = StreamerView.render("update.json", item)
-
- Registry.dispatch(@registry, topic, fn list ->
- Enum.each(list, fn {pid, auth?} ->
- if auth? do
- send(pid, {:render_with_user, StreamerView, "update.json", item})
- else
- send(pid, {:text, anon_render})
- end
- end)
- end)
- end
-
- 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
-
- # In test environement, only return true if the registry is started.
- # In benchmark environment, returns false.
- # In any other environment, always returns true.
- cond do
- @mix_env == :test ->
- def should_env_send? do
- case Process.whereis(@registry) do
- nil ->
- false
-
- pid ->
- Process.alive?(pid)
- end
- end
-
- @mix_env == :benchmark ->
- def should_env_send?, do: false
-
- true ->
- def should_env_send?, do: true
- end
-end
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