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object.ex
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# 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.{Repo, Object, User, Activity, ObjectTombstone}
import Ecto.{Query, Changeset}
schema "objects" do
field(:data, :map)
timestamps()
end
def insert_or_get(cng) do
{_, data} = fetch_field(cng, :data)
id = data["id"] || data[:id]
key = "object:#{id}"
fetcher = fn _ ->
with nil <- get_by_ap_id(id),
{:ok, object} <- Repo.insert(cng) do
{:commit, object}
else
%Object{} = object -> {:commit, object}
e -> {:ignore, e}
end
end
with {state, object} when state in [:commit, :ok] <- Cachex.fetch(:object_cache, key, fetcher) do
{:ok, object}
end
end
def create(data) do
Object.change(%Object{}, %{data: data})
|> insert_or_get()
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(%{"id" => ap_id}), do: normalize(ap_id)
def normalize(ap_id) when is_binary(ap_id), do: get_cached_by_ap_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),
Repo.delete_all(Activity.by_object_ap_id(id)),
{:ok, true} <- Cachex.del(:object_cache, "object:#{id}") do
{:ok, object}
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
end

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