akkoma/lib/pleroma/web/activity_pub/side_effects.ex
2020-12-21 16:48:35 +01:00

465 lines
14 KiB
Elixir

# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
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.Activity.Ir.Topics
alias Pleroma.Chat
alias Pleroma.Chat.MessageReference
alias Pleroma.FollowingRelationship
alias Pleroma.Notification
alias Pleroma.Object
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Web.ActivityPub.Builder
alias Pleroma.Web.ActivityPub.Pipeline
alias Pleroma.Web.ActivityPub.Utils
alias Pleroma.Web.Push
alias Pleroma.Web.Streamer
require Logger
@cachex Pleroma.Config.get([:cachex, :provider], Cachex)
@behaviour Pleroma.Web.ActivityPub.SideEffects.Handling
@impl true
def handle(object, meta \\ [])
# Task this handles
# - Follows
# - Sends a notification
@impl true
def handle(
%{
data: %{
"actor" => actor,
"type" => "Accept",
"object" => follow_activity_id
}
} = object,
meta
) do
with %Activity{actor: follower_id} = follow_activity <-
Activity.get_by_ap_id(follow_activity_id),
%User{} = followed <- User.get_cached_by_ap_id(actor),
%User{} = follower <- User.get_cached_by_ap_id(follower_id),
{:ok, follow_activity} <- Utils.update_follow_state_for_all(follow_activity, "accept"),
{:ok, _follower, followed} <-
FollowingRelationship.update(follower, followed, :follow_accept) do
Notification.update_notification_type(followed, follow_activity)
end
{:ok, object, meta}
end
# Task this handles
# - Rejects all existing follow activities for this person
# - Updates the follow state
# - Dismisses notification
@impl true
def handle(
%{
data: %{
"actor" => actor,
"type" => "Reject",
"object" => follow_activity_id
}
} = object,
meta
) do
with %Activity{actor: follower_id} = follow_activity <-
Activity.get_by_ap_id(follow_activity_id),
%User{} = followed <- User.get_cached_by_ap_id(actor),
%User{} = follower <- User.get_cached_by_ap_id(follower_id),
{:ok, _follow_activity} <- Utils.update_follow_state_for_all(follow_activity, "reject") do
FollowingRelationship.update(follower, followed, :follow_reject)
Notification.dismiss(follow_activity)
end
{:ok, object, meta}
end
# Tasks this handle
# - Follows if possible
# - Sends a notification
# - Generates accept or reject if appropriate
@impl true
def handle(
%{
data: %{
"id" => follow_id,
"type" => "Follow",
"object" => followed_user,
"actor" => following_user
}
} = object,
meta
) do
with %User{} = follower <- User.get_cached_by_ap_id(following_user),
%User{} = followed <- User.get_cached_by_ap_id(followed_user),
{_, {:ok, _, _}, _, _} <-
{:following, User.follow(follower, followed, :follow_pending), follower, followed} do
if followed.local && !followed.is_locked do
{:ok, accept_data, _} = Builder.accept(followed, object)
{:ok, _activity, _} = Pipeline.common_pipeline(accept_data, local: true)
end
else
{:following, {:error, _}, _follower, followed} ->
{:ok, reject_data, _} = Builder.reject(followed, object)
{:ok, _activity, _} = Pipeline.common_pipeline(reject_data, local: true)
_ ->
nil
end
{:ok, notifications} = Notification.create_notifications(object, do_send: false)
meta =
meta
|> add_notifications(notifications)
updated_object = Activity.get_by_ap_id(follow_id)
{:ok, updated_object, meta}
end
# Tasks this handles:
# - Unfollow and block
@impl true
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.
@impl true
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
@impl true
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
# - Increase the user note count
# - Increase the reply count
# - Increase replies count
# - Set up ActivityExpiration
# - Set up notifications
@impl true
def handle(%{data: %{"type" => "Create"}} = activity, meta) do
with {:ok, object, meta} <- handle_object_creation(meta[:object_data], meta),
%User{} = user <- User.get_cached_by_ap_id(activity.data["actor"]) do
{:ok, notifications} = Notification.create_notifications(activity, do_send: false)
{:ok, _user} = ActivityPub.increase_note_count_if_public(user, object)
if in_reply_to = object.data["inReplyTo"] && object.data["type"] != "Answer" do
Object.increase_replies_count(in_reply_to)
end
ConcurrentLimiter.limit(Pleroma.Web.RichMedia.Helpers, fn ->
Task.start(fn -> Pleroma.Web.RichMedia.Helpers.fetch_data_for_activity(activity) end)
end)
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
@impl true
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
@impl true
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
@impl true
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
@impl true
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),
{_, actor} when is_binary(actor) <- {:actor, deleted_object.data["actor"]},
%User{} = user <- User.get_cached_by_ap_id(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
else
{:actor, _} ->
Logger.error("The object doesn't have an actor: #{inspect(deleted_object)}")
:no_object_actor
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
@impl true
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.uniq()
|> 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)
@cachex.put(
:chat_message_id_idempotency_key_cache,
cm_ref.id,
meta[:idempotency_key]
)
{
["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
def handle_object_creation(%{"type" => "Answer"} = object_map, meta) do
with {:ok, object, meta} <- Pipeline.common_pipeline(object_map, meta) do
Object.increase_vote_count(
object.data["inReplyTo"],
object.data["name"],
object.data["actor"]
)
{:ok, object, meta}
end
end
def handle_object_creation(%{"type" => objtype} = object, meta)
when objtype in ~w[Audio Video Question Event Article] do
with {:ok, object, meta} <- Pipeline.common_pipeline(object, meta) do
{:ok, object, meta}
end
end
# Nothing to do
def handle_object_creation(object, meta) do
{:ok, object, meta}
end
defp undo_like(nil, object), do: delete_object(object)
defp undo_like(%Object{} = liked_object, object) do
with {:ok, _} <- Utils.remove_like_from_object(object, liked_object) do
delete_object(object)
end
end
def handle_undoing(%{data: %{"type" => "Like"}} = object) do
object.data["object"]
|> Object.get_by_ap_id()
|> undo_like(object)
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]}
@spec delete_object(Object.t()) :: :ok | {:error, Ecto.Changeset.t()}
defp delete_object(object) do
with {:ok, _} <- Repo.delete(object), do: :ok
end
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
@impl true
def handle_after_transaction(meta) do
meta
|> send_notifications()
|> send_streamables()
end
end