forked from YokaiRick/akkoma
295 lines
8.8 KiB
Elixir
295 lines
8.8 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.Streamer do
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require Logger
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alias Pleroma.Activity
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alias Pleroma.Chat.MessageReference
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alias Pleroma.Config
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alias Pleroma.Conversation.Participation
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alias Pleroma.Notification
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alias Pleroma.Object
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alias Pleroma.User
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alias Pleroma.Web.ActivityPub.ActivityPub
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alias Pleroma.Web.ActivityPub.Visibility
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alias Pleroma.Web.CommonAPI
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alias Pleroma.Web.StreamerView
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@mix_env Mix.env()
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@registry Pleroma.Web.StreamerRegistry
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def registry, do: @registry
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@public_streams ["public", "public:local", "public:media", "public:local:media"]
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@user_streams ["user", "user:notification", "direct", "user:pleroma_chat"]
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@doc "Expands and authorizes a stream, and registers the process for streaming."
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@spec get_topic_and_add_socket(stream :: String.t(), User.t() | nil, Map.t() | nil) ::
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{:ok, topic :: String.t()} | {:error, :bad_topic} | {:error, :unauthorized}
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def get_topic_and_add_socket(stream, user, params \\ %{}) do
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case get_topic(stream, user, params) do
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{:ok, topic} -> add_socket(topic, user)
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error -> error
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end
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end
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@doc "Expand and authorizes a stream"
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@spec get_topic(stream :: String.t(), User.t() | nil, Map.t()) ::
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{:ok, topic :: String.t()} | {:error, :bad_topic}
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def get_topic(stream, user, params \\ %{})
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# Allow all public steams.
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def get_topic(stream, _, _) when stream in @public_streams do
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{:ok, stream}
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end
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# Allow all hashtags streams.
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def get_topic("hashtag", _, %{"tag" => tag}) do
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{:ok, "hashtag:" <> tag}
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end
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# Expand user streams.
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def get_topic(stream, %User{} = user, _) when stream in @user_streams do
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{:ok, stream <> ":" <> to_string(user.id)}
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end
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def get_topic(stream, _, _) when stream in @user_streams do
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{:error, :unauthorized}
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end
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# List streams.
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def get_topic("list", %User{} = user, %{"list" => id}) do
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if Pleroma.List.get(id, user) do
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{:ok, "list:" <> to_string(id)}
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else
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{:error, :bad_topic}
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end
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end
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def get_topic("list", _, _) do
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{:error, :unauthorized}
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end
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def get_topic(_, _, _) do
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{:error, :bad_topic}
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end
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@doc "Registers the process for streaming. Use `get_topic/3` to get the full authorized topic."
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def add_socket(topic, user) do
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if should_env_send?() do
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auth? = if user, do: true
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Registry.register(@registry, topic, auth?)
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end
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{:ok, topic}
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end
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def remove_socket(topic) do
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if should_env_send?(), do: Registry.unregister(@registry, topic)
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end
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def stream(topics, items) do
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if should_env_send?() do
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List.wrap(topics)
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|> Enum.each(fn topic ->
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List.wrap(items)
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|> Enum.each(fn item ->
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spawn(fn -> do_stream(topic, item) end)
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end)
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end)
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end
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:ok
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end
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def filtered_by_user?(user, item, streamed_type \\ :activity)
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def filtered_by_user?(%User{} = user, %Activity{} = item, streamed_type) do
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%{block: blocked_ap_ids, mute: muted_ap_ids, reblog_mute: reblog_muted_ap_ids} =
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User.outgoing_relationships_ap_ids(user, [:block, :mute, :reblog_mute])
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recipient_blocks = MapSet.new(blocked_ap_ids ++ muted_ap_ids)
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recipients = MapSet.new(item.recipients)
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domain_blocks = Pleroma.Web.ActivityPub.MRF.subdomains_regex(user.domain_blocks)
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with parent <- Object.normalize(item) || item,
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true <-
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Enum.all?([blocked_ap_ids, muted_ap_ids], &(item.actor not in &1)),
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true <- item.data["type"] != "Announce" || item.actor not in reblog_muted_ap_ids,
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true <-
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!(streamed_type == :activity && item.data["type"] == "Announce" &&
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parent.data["actor"] == user.ap_id),
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true <- Enum.all?([blocked_ap_ids, muted_ap_ids], &(parent.data["actor"] not in &1)),
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true <- MapSet.disjoint?(recipients, recipient_blocks),
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%{host: item_host} <- URI.parse(item.actor),
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%{host: parent_host} <- URI.parse(parent.data["actor"]),
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false <- Pleroma.Web.ActivityPub.MRF.subdomain_match?(domain_blocks, item_host),
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false <- Pleroma.Web.ActivityPub.MRF.subdomain_match?(domain_blocks, parent_host),
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true <- thread_containment(item, user),
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false <- CommonAPI.thread_muted?(user, parent) do
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false
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else
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_ -> true
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end
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end
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def filtered_by_user?(%User{} = user, %Notification{activity: activity}, _) do
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filtered_by_user?(user, activity, :notification)
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end
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defp do_stream("direct", item) do
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recipient_topics =
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User.get_recipients_from_activity(item)
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|> Enum.map(fn %{id: id} -> "direct:#{id}" end)
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Enum.each(recipient_topics, fn user_topic ->
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Logger.debug("Trying to push direct message to #{user_topic}\n\n")
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push_to_socket(user_topic, item)
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end)
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end
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defp do_stream("participation", participation) do
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user_topic = "direct:#{participation.user_id}"
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Logger.debug("Trying to push a conversation participation to #{user_topic}\n\n")
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push_to_socket(user_topic, participation)
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end
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defp do_stream("list", item) do
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# filter the recipient list if the activity is not public, see #270.
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recipient_lists =
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case Visibility.is_public?(item) do
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true ->
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Pleroma.List.get_lists_from_activity(item)
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_ ->
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Pleroma.List.get_lists_from_activity(item)
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|> Enum.filter(fn list ->
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owner = User.get_cached_by_id(list.user_id)
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Visibility.visible_for_user?(item, owner)
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end)
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end
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recipient_topics =
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recipient_lists
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|> Enum.map(fn %{id: id} -> "list:#{id}" end)
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Enum.each(recipient_topics, fn list_topic ->
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Logger.debug("Trying to push message to #{list_topic}\n\n")
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push_to_socket(list_topic, item)
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end)
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end
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defp do_stream(topic, %Notification{} = item)
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when topic in ["user", "user:notification"] do
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Registry.dispatch(@registry, "#{topic}:#{item.user_id}", fn list ->
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Enum.each(list, fn {pid, _auth} ->
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send(pid, {:render_with_user, StreamerView, "notification.json", item})
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end)
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end)
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end
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defp do_stream(topic, {user, %MessageReference{} = cm_ref})
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when topic in ["user", "user:pleroma_chat"] do
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topic = "#{topic}:#{user.id}"
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text = StreamerView.render("chat_update.json", %{chat_message_reference: cm_ref})
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Registry.dispatch(@registry, topic, fn list ->
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Enum.each(list, fn {pid, _auth} ->
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send(pid, {:text, text})
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end)
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end)
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end
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defp do_stream("user", item) do
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Logger.debug("Trying to push to users")
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recipient_topics =
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User.get_recipients_from_activity(item)
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|> Enum.map(fn %{id: id} -> "user:#{id}" end)
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Enum.each(recipient_topics, fn topic ->
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push_to_socket(topic, item)
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end)
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end
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defp do_stream(topic, item) do
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Logger.debug("Trying to push to #{topic}")
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Logger.debug("Pushing item to #{topic}")
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push_to_socket(topic, item)
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end
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defp push_to_socket(topic, %Participation{} = participation) do
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rendered = StreamerView.render("conversation.json", participation)
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Registry.dispatch(@registry, topic, fn list ->
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Enum.each(list, fn {pid, _} ->
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send(pid, {:text, rendered})
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end)
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end)
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end
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defp push_to_socket(topic, %Activity{
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data: %{"type" => "Delete", "deleted_activity_id" => deleted_activity_id}
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}) do
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rendered = Jason.encode!(%{event: "delete", payload: to_string(deleted_activity_id)})
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Registry.dispatch(@registry, topic, fn list ->
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Enum.each(list, fn {pid, _} ->
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send(pid, {:text, rendered})
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end)
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end)
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end
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defp push_to_socket(_topic, %Activity{data: %{"type" => "Delete"}}), do: :noop
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defp push_to_socket(topic, item) do
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anon_render = StreamerView.render("update.json", item)
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Registry.dispatch(@registry, topic, fn list ->
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Enum.each(list, fn {pid, auth?} ->
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if auth? do
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send(pid, {:render_with_user, StreamerView, "update.json", item})
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else
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send(pid, {:text, anon_render})
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end
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end)
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end)
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end
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defp thread_containment(_activity, %User{skip_thread_containment: true}), do: true
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defp thread_containment(activity, user) do
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if Config.get([:instance, :skip_thread_containment]) do
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true
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else
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ActivityPub.contain_activity(activity, user)
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end
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end
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# In test environement, only return true if the registry is started.
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# In benchmark environment, returns false.
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# In any other environment, always returns true.
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cond do
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@mix_env == :test ->
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def should_env_send? do
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case Process.whereis(@registry) do
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nil ->
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false
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pid ->
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Process.alive?(pid)
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end
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end
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@mix_env == :benchmark ->
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def should_env_send?, do: false
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true ->
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def should_env_send?, do: true
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end
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end
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