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.ChatMessageReference alias Pleroma.Notification alias Pleroma.Object alias Pleroma.Repo alias Pleroma.User alias Pleroma.Web.ActivityPub.ActivityPub alias Pleroma.Web.ActivityPub.Pipeline alias Pleroma.Web.ActivityPub.Utils alias Pleroma.Web.Streamer 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 # 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 Notification.create_notifications(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 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) ActivityPub.stream_out(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 ChatMessageReference.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"])) [[actor, recipient], [recipient, actor]] |> Enum.each(fn [user, other_user] -> if user.local do {:ok, chat} = Chat.bump_or_create(user.id, other_user.ap_id) {:ok, cm_ref} = ChatMessageReference.create(chat, object, user.ap_id != actor.ap_id) # We add a cache of the unread value here so that it # doesn't change when being streamed out chat = chat |> Map.put(:unread, ChatMessageReference.unread_count_for_chat(chat)) Streamer.stream( ["user", "user:pleroma_chat"], {user, %{cm_ref | chat: chat, object: object}} ) end end) {: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]} end