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

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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.Notification
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alias Pleroma.Object
alias Pleroma.Repo
alias Pleroma.User
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alias Pleroma.Web.ActivityPub.Utils
def handle(object, meta \\ [])
# 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
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
# Nothing to do
def handle(object, meta) do
{:ok, object, meta}
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]}
end