# Pleroma: A lightweight social networking server # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Object do use Ecto.Schema alias Pleroma.Activity alias Pleroma.Object alias Pleroma.Object.Fetcher alias Pleroma.ObjectTombstone alias Pleroma.Repo alias Pleroma.User import Ecto.Query import Ecto.Changeset require Logger schema "objects" do field(:data, :map) timestamps() end def create(data) do Object.change(%Object{}, %{data: data}) |> Repo.insert() end def change(struct, params \\ %{}) do struct |> cast(params, [:data]) |> validate_required([:data]) |> unique_constraint(:ap_id, name: :objects_unique_apid_index) end def get_by_ap_id(nil), do: nil def get_by_ap_id(ap_id) do Repo.one(from(object in Object, where: fragment("(?)->>'id' = ?", object.data, ^ap_id))) end def normalize(_, fetch_remote \\ true) # If we pass an Activity to Object.normalize(), we can try to use the preloaded object. # Use this whenever possible, especially when walking graphs in an O(N) loop! def normalize(%Object{} = object, _), do: object def normalize(%Activity{object: %Object{} = object}, _), do: object # A hack for fake activities def normalize(%Activity{data: %{"object" => %{"fake" => true} = data}}, _) do %Object{id: "pleroma:fake_object_id", data: data} end # Catch and log Object.normalize() calls where the Activity's child object is not # preloaded. def normalize(%Activity{data: %{"object" => %{"id" => ap_id}}}, fetch_remote) do Logger.debug( "Object.normalize() called without preloaded object (#{ap_id}). Consider preloading the object!" ) Logger.debug("Backtrace: #{inspect(Process.info(:erlang.self(), :current_stacktrace))}") normalize(ap_id, fetch_remote) end def normalize(%Activity{data: %{"object" => ap_id}}, fetch_remote) do Logger.debug( "Object.normalize() called without preloaded object (#{ap_id}). Consider preloading the object!" ) Logger.debug("Backtrace: #{inspect(Process.info(:erlang.self(), :current_stacktrace))}") normalize(ap_id, fetch_remote) end # Old way, try fetching the object through cache. def normalize(%{"id" => ap_id}, fetch_remote), do: normalize(ap_id, fetch_remote) def normalize(ap_id, false) when is_binary(ap_id), do: get_cached_by_ap_id(ap_id) def normalize(ap_id, true) when is_binary(ap_id), do: Fetcher.fetch_object_from_id!(ap_id) def normalize(_, _), do: nil # Owned objects can only be mutated by their owner def authorize_mutation(%Object{data: %{"actor" => actor}}, %User{ap_id: ap_id}), do: actor == ap_id # Legacy objects can be mutated by anybody def authorize_mutation(%Object{}, %User{}), do: true def get_cached_by_ap_id(ap_id) do key = "object:#{ap_id}" Cachex.fetch!(:object_cache, key, fn _ -> object = get_by_ap_id(ap_id) if object do {:commit, object} else {:ignore, object} end end) end def context_mapping(context) do Object.change(%Object{}, %{data: %{"id" => context}}) end def make_tombstone(%Object{data: %{"id" => id, "type" => type}}, deleted \\ DateTime.utc_now()) do %ObjectTombstone{ id: id, formerType: type, deleted: deleted } |> Map.from_struct() end def swap_object_with_tombstone(object) do tombstone = make_tombstone(object) object |> Object.change(%{data: tombstone}) |> Repo.update() end def delete(%Object{data: %{"id" => id}} = object) do with {:ok, _obj} = swap_object_with_tombstone(object), deleted_activity = Activity.delete_by_ap_id(id), {:ok, true} <- Cachex.del(:object_cache, "object:#{id}") do {:ok, object, deleted_activity} end end def set_cache(%Object{data: %{"id" => ap_id}} = object) do Cachex.put(:object_cache, "object:#{ap_id}", object) {:ok, object} end def update_and_set_cache(changeset) do with {:ok, object} <- Repo.update(changeset) do set_cache(object) else e -> e end end def increase_replies_count(ap_id) do Object |> where([o], fragment("?->>'id' = ?::text", o.data, ^to_string(ap_id))) |> update([o], set: [ data: fragment( """ jsonb_set(?, '{repliesCount}', (coalesce((?->>'repliesCount')::int, 0) + 1)::varchar::jsonb, true) """, o.data, o.data ) ] ) |> Repo.update_all([]) |> case do {1, [object]} -> set_cache(object) _ -> {:error, "Not found"} end end def decrease_replies_count(ap_id) do Object |> where([o], fragment("?->>'id' = ?::text", o.data, ^to_string(ap_id))) |> update([o], set: [ data: fragment( """ jsonb_set(?, '{repliesCount}', (greatest(0, (?->>'repliesCount')::int - 1))::varchar::jsonb, true) """, o.data, o.data ) ] ) |> Repo.update_all([]) |> case do {1, [object]} -> set_cache(object) _ -> {:error, "Not found"} end end end