akkoma/lib/pleroma/web/activity_pub/side_effects.ex

584 lines
18 KiB
Elixir

# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 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.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
alias Pleroma.Workers.PollWorker
require Pleroma.Constants
require Logger
@logger Pleroma.Config.get([:side_effects, :logger], Logger)
@behaviour Pleroma.Web.ActivityPub.SideEffects.Handling
defp ap_streamer, do: Pleroma.Config.get([:side_effects, :ap_streamer], ActivityPub)
@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
# - Update a non-user object (Note, Question, etc.)
#
# 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
updated_object_id = updated_object["id"]
with {_, true} <- {:has_id, is_binary(updated_object_id)},
%{"type" => type} <- updated_object,
{_, is_user} <- {:is_user, type in Pleroma.Constants.actor_types()} do
if is_user do
handle_update_user(object, meta)
else
handle_update_object(object, meta)
end
else
_ ->
{:ok, object, meta}
end
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
# - Index incoming posts for search (if needed)
@impl true
def handle(%{data: %{"type" => "Create"}} = activity, meta) do
with {:ok, object, meta} <- handle_object_creation(meta[:object_data], activity, 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)
{:ok, _user} = ActivityPub.update_last_status_at_if_public(user, object)
if in_reply_to = object.data["type"] != "Answer" && object.data["inReplyTo"] do
Object.increase_replies_count(in_reply_to)
end
reply_depth = (meta[:depth] || 0) + 1
# FIXME: Force inReplyTo to replies
if Pleroma.Web.Federator.allowed_thread_distance?(reply_depth) and
object.data["replies"] != nil do
for reply_id <- object.data["replies"] do
Pleroma.Workers.RemoteFetcherWorker.enqueue("fetch_remote", %{
"id" => reply_id,
"depth" => reply_depth
})
end
end
ConcurrentLimiter.limit(Pleroma.Web.RichMedia.Helpers, fn ->
Task.start(fn -> Pleroma.Web.RichMedia.Helpers.fetch_data_for_activity(activity) end)
end)
Pleroma.Search.add_to_index(Map.put(activity, :object, object))
meta =
meta
|> add_notifications(notifications)
ap_streamer().stream_out(activity)
{: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)
ap_streamer().stream_out(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
# - Removes posts from search index (if needed)
@impl true
def handle(%{data: %{"type" => "Delete", "object" => deleted_object}} = object, meta) do
deleted_object =
Object.normalize(deleted_object, fetch: 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_pinned_object_id(user, deleted_object.data["id"])
{: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
ap_streamer().stream_out(object)
ap_streamer().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
# Only remove from index when deleting actual objects, not users or anything else
with %Pleroma.Object{} <- deleted_object do
Pleroma.Search.remove_from_index(deleted_object)
end
{:ok, object, meta}
else
{:error, result}
end
end
# Tasks this handles:
# - adds pin to user
# - removes expiration job for pinned activity, if was set for expiration
@impl true
def handle(%{data: %{"type" => "Add"} = data} = object, meta) do
with %User{} = user <- User.get_cached_by_ap_id(data["actor"]),
{:ok, _user} <- User.add_pinned_object_id(user, data["object"]) do
# if pinned activity was scheduled for deletion, we remove job
if expiration = Pleroma.Workers.PurgeExpiredActivity.get_expiration(meta[:activity_id]) do
Oban.cancel_job(expiration.id)
end
{:ok, object, meta}
else
nil ->
{:error, :user_not_found}
{:error, changeset} ->
if changeset.errors[:pinned_objects] do
{:error, :pinned_statuses_limit_reached}
else
changeset.errors
end
end
end
# Tasks this handles:
# - removes pin from user
# - removes corresponding Add activity
# - if activity had expiration, recreates activity expiration job
@impl true
def handle(%{data: %{"type" => "Remove"} = data} = object, meta) do
with %User{} = user <- User.get_cached_by_ap_id(data["actor"]),
{:ok, _user} <- User.remove_pinned_object_id(user, data["object"]) do
data["object"]
|> Activity.add_by_params_query(user.ap_id, user.featured_address)
|> Repo.delete_all()
# if pinned activity was scheduled for deletion, we reschedule it for deletion
if meta[:expires_at] do
# MRF.ActivityExpirationPolicy used UTC timestamps for expires_at in original implementation
{:ok, expires_at} =
Pleroma.EctoType.ActivityPub.ObjectValidators.DateTime.cast(meta[:expires_at])
Pleroma.Workers.PurgeExpiredActivity.enqueue(%{
activity_id: meta[:activity_id],
expires_at: expires_at
})
end
{:ok, object, meta}
else
nil -> {:error, :user_not_found}
error -> error
end
end
# Nothing to do
@impl true
def handle(object, meta) do
{:ok, object, meta}
end
defp handle_update_user(
%{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
defp handle_update_object(
%{data: %{"type" => "Update", "object" => updated_object}} = object,
meta
) do
orig_object_ap_id = updated_object["id"]
orig_object = Object.get_by_ap_id(orig_object_ap_id)
orig_object_data = orig_object.data
updated_object =
if meta[:local] do
# If this is a local Update, we don't process it by transmogrifier,
# so we use the embedded object as-is.
updated_object
else
meta[:object_data]
end
if orig_object_data["type"] in Pleroma.Constants.updatable_object_types() do
%{
updated_data: updated_object_data,
updated: updated,
used_history_in_new_object?: used_history_in_new_object?
} = Object.Updater.make_new_object_data_from_update_object(orig_object_data, updated_object)
changeset =
orig_object
|> Repo.preload(:hashtags)
|> Object.change(%{data: updated_object_data})
with {:ok, new_object} <- Repo.update(changeset),
{:ok, _} <- Object.invalid_object_cache(new_object),
{:ok, _} <- Object.set_cache(new_object),
# The metadata/utils.ex uses the object id for the cache.
{:ok, _} <- Pleroma.Activity.HTML.invalidate_cache_for(new_object.id) do
if used_history_in_new_object? do
with create_activity when not is_nil(create_activity) <-
Pleroma.Activity.get_create_by_object_ap_id(orig_object_ap_id),
{:ok, _} <- Pleroma.Activity.HTML.invalidate_cache_for(create_activity.id) do
nil
else
_ -> nil
end
end
if updated do
object
|> Activity.normalize()
|> ActivityPub.notify_and_stream()
end
end
end
{:ok, object, meta}
end
def handle_object_creation(%{"type" => "Question"} = object, activity, meta) do
with {:ok, object, meta} <- Pipeline.common_pipeline(object, meta) do
PollWorker.schedule_poll_end(activity)
{:ok, object, meta}
end
end
def handle_object_creation(%{"type" => "Answer"} = object_map, _activity, 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, _activity, meta)
when objtype in ~w[Audio Video Event Article Note Page] do
with {:ok, object, meta} <- Pipeline.common_pipeline(object, meta) do
{:ok, object, meta}
end
end
# Nothing to do
def handle_object_creation(object, _activity, 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_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