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 alias Pleroma.Object alias Pleroma.Repo alias Pleroma.User 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