akkoma/lib/pleroma/web/activity_pub/side_effects.ex
2020-07-02 09:33:50 +02:00

288 lines
8.3 KiB
Elixir

defmodule Pleroma.Web.ActivityPub.SideEffects do
@moduledoc """
This module looks at an inserted object and executes the side effects that it
implies. For example, a `Like` activity will increase the like count on the
liked object, a `Follow` activity will add the user to the follower
collection, and so on.
"""
alias Pleroma.Activity
alias Pleroma.Chat
alias Pleroma.Chat.MessageReference
alias Pleroma.Notification
alias Pleroma.Object
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Activity.Ir.Topics
alias Pleroma.Web.ActivityPub.Pipeline
alias Pleroma.Web.ActivityPub.Utils
alias Pleroma.Web.Push
alias Pleroma.Web.Streamer
def handle(object, meta \\ [])
# Tasks this handles:
# - Unfollow and block
def handle(
%{data: %{"type" => "Block", "object" => blocked_user, "actor" => blocking_user}} =
object,
meta
) do
with %User{} = blocker <- User.get_cached_by_ap_id(blocking_user),
%User{} = blocked <- User.get_cached_by_ap_id(blocked_user) do
User.block(blocker, blocked)
end
{:ok, object, meta}
end
# Tasks this handles:
# - Update the user
#
# For a local user, we also get a changeset with the full information, so we
# can update non-federating, non-activitypub settings as well.
def handle(%{data: %{"type" => "Update", "object" => updated_object}} = object, meta) do
if changeset = Keyword.get(meta, :user_update_changeset) do
changeset
|> User.update_and_set_cache()
else
{:ok, new_user_data} = ActivityPub.user_data_from_user_object(updated_object)
User.get_by_ap_id(updated_object["id"])
|> User.remote_user_changeset(new_user_data)
|> User.update_and_set_cache()
end
{:ok, object, meta}
end
# Tasks this handles:
# - Add like to object
# - Set up notification
def handle(%{data: %{"type" => "Like"}} = object, meta) do
liked_object = Object.get_by_ap_id(object.data["object"])
Utils.add_like_to_object(object, liked_object)
Notification.create_notifications(object)
{:ok, object, meta}
end
# Tasks this handles
# - Actually create object
# - Rollback if we couldn't create it
# - Set up notifications
def handle(%{data: %{"type" => "Create"}} = activity, meta) do
with {:ok, _object, meta} <- handle_object_creation(meta[:object_data], meta) do
{:ok, notifications} = Notification.create_notifications(activity, do_send: false)
meta =
meta
|> add_notifications(notifications)
{:ok, activity, meta}
else
e -> Repo.rollback(e)
end
end
# Tasks this handles:
# - Add announce to object
# - Set up notification
# - Stream out the announce
def handle(%{data: %{"type" => "Announce"}} = object, meta) do
announced_object = Object.get_by_ap_id(object.data["object"])
user = User.get_cached_by_ap_id(object.data["actor"])
Utils.add_announce_to_object(object, announced_object)
if !User.is_internal_user?(user) do
Notification.create_notifications(object)
object
|> Topics.get_activity_topics()
|> Streamer.stream(object)
end
{:ok, object, meta}
end
def handle(%{data: %{"type" => "Undo", "object" => undone_object}} = object, meta) do
with undone_object <- Activity.get_by_ap_id(undone_object),
:ok <- handle_undoing(undone_object) do
{:ok, object, meta}
end
end
# Tasks this handles:
# - Add reaction to object
# - Set up notification
def handle(%{data: %{"type" => "EmojiReact"}} = object, meta) do
reacted_object = Object.get_by_ap_id(object.data["object"])
Utils.add_emoji_reaction_to_object(object, reacted_object)
Notification.create_notifications(object)
{:ok, object, meta}
end
# Tasks this handles:
# - Delete and unpins the create activity
# - Replace object with Tombstone
# - Set up notification
# - Reduce the user note count
# - Reduce the reply count
# - Stream out the activity
def handle(%{data: %{"type" => "Delete", "object" => deleted_object}} = object, meta) do
deleted_object =
Object.normalize(deleted_object, false) || User.get_cached_by_ap_id(deleted_object)
result =
case deleted_object do
%Object{} ->
with {:ok, deleted_object, activity} <- Object.delete(deleted_object),
%User{} = user <- User.get_cached_by_ap_id(deleted_object.data["actor"]) do
User.remove_pinnned_activity(user, activity)
{:ok, user} = ActivityPub.decrease_note_count_if_public(user, deleted_object)
if in_reply_to = deleted_object.data["inReplyTo"] do
Object.decrease_replies_count(in_reply_to)
end
MessageReference.delete_for_object(deleted_object)
ActivityPub.stream_out(object)
ActivityPub.stream_out_participations(deleted_object, user)
:ok
end
%User{} ->
with {:ok, _} <- User.delete(deleted_object) do
:ok
end
end
if result == :ok do
Notification.create_notifications(object)
{:ok, object, meta}
else
{:error, result}
end
end
# Nothing to do
def handle(object, meta) do
{:ok, object, meta}
end
def handle_object_creation(%{"type" => "ChatMessage"} = object, meta) do
with {:ok, object, meta} <- Pipeline.common_pipeline(object, meta) do
actor = User.get_cached_by_ap_id(object.data["actor"])
recipient = User.get_cached_by_ap_id(hd(object.data["to"]))
streamables =
[[actor, recipient], [recipient, actor]]
|> Enum.map(fn [user, other_user] ->
if user.local do
{:ok, chat} = Chat.bump_or_create(user.id, other_user.ap_id)
{:ok, cm_ref} = MessageReference.create(chat, object, user.ap_id != actor.ap_id)
{
["user", "user:pleroma_chat"],
{user, %{cm_ref | chat: chat, object: object}}
}
end
end)
|> Enum.filter(& &1)
meta =
meta
|> add_streamables(streamables)
{:ok, object, meta}
end
end
# Nothing to do
def handle_object_creation(object) do
{:ok, object}
end
def handle_undoing(%{data: %{"type" => "Like"}} = object) do
with %Object{} = liked_object <- Object.get_by_ap_id(object.data["object"]),
{:ok, _} <- Utils.remove_like_from_object(object, liked_object),
{:ok, _} <- Repo.delete(object) do
:ok
end
end
def handle_undoing(%{data: %{"type" => "EmojiReact"}} = object) do
with %Object{} = reacted_object <- Object.get_by_ap_id(object.data["object"]),
{:ok, _} <- Utils.remove_emoji_reaction_from_object(object, reacted_object),
{:ok, _} <- Repo.delete(object) do
:ok
end
end
def handle_undoing(%{data: %{"type" => "Announce"}} = object) do
with %Object{} = liked_object <- Object.get_by_ap_id(object.data["object"]),
{:ok, _} <- Utils.remove_announce_from_object(object, liked_object),
{:ok, _} <- Repo.delete(object) do
:ok
end
end
def handle_undoing(
%{data: %{"type" => "Block", "actor" => blocker, "object" => blocked}} = object
) do
with %User{} = blocker <- User.get_cached_by_ap_id(blocker),
%User{} = blocked <- User.get_cached_by_ap_id(blocked),
{:ok, _} <- User.unblock(blocker, blocked),
{:ok, _} <- Repo.delete(object) do
:ok
end
end
def handle_undoing(object), do: {:error, ["don't know how to handle", object]}
defp send_notifications(meta) do
Keyword.get(meta, :notifications, [])
|> Enum.each(fn notification ->
Streamer.stream(["user", "user:notification"], notification)
Push.send(notification)
end)
meta
end
defp send_streamables(meta) do
Keyword.get(meta, :streamables, [])
|> Enum.each(fn {topics, items} ->
Streamer.stream(topics, items)
end)
meta
end
defp add_streamables(meta, streamables) do
existing = Keyword.get(meta, :streamables, [])
meta
|> Keyword.put(:streamables, streamables ++ existing)
end
defp add_notifications(meta, notifications) do
existing = Keyword.get(meta, :notifications, [])
meta
|> Keyword.put(:notifications, notifications ++ existing)
end
def handle_after_transaction(meta) do
meta
|> send_notifications()
|> send_streamables()
end
end