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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Object do
   6   use Ecto.Schema
   7   alias Pleroma.{Repo, Object, User, Activity, ObjectTombstone}
   8   import Ecto.{Query, Changeset}
   9
  10   schema "objects" do
  11     field(:data, :map)
  12
  13     timestamps()
  14   end
  15
  16   def create(data) do
  17     Object.change(%Object{}, %{data: data})
  18     |> Repo.insert()
  19   end
  20
  21   def change(struct, params \\ %{}) do
  22     struct
  23     |> cast(params, [:data])
  24     |> validate_required([:data])
  25     |> unique_constraint(:ap_id, name: :objects_unique_apid_index)
  26   end
  27
  28   def get_by_ap_id(nil), do: nil
  29
  30   def get_by_ap_id(ap_id) do
  31     Repo.one(from(object in Object, where: fragment("(?)->>'id' = ?", object.data, ^ap_id)))
  32   end
  33
  34   def normalize(%{"id" => ap_id}), do: normalize(ap_id)
  35   def normalize(ap_id) when is_binary(ap_id), do: get_cached_by_ap_id(ap_id)
  36   def normalize(_), do: nil
  37
  38   # Owned objects can only be mutated by their owner
  39   def authorize_mutation(%Object{data: %{"actor" => actor}}, %User{ap_id: ap_id}),
  40     do: actor == ap_id
  41
  42   # Legacy objects can be mutated by anybody
  43   def authorize_mutation(%Object{}, %User{}), do: true
  44
  45   def get_cached_by_ap_id(ap_id) do
  46     key = "object:#{ap_id}"
  47
  48     Cachex.fetch!(:object_cache, key, fn _ ->
  49       object = get_by_ap_id(ap_id)
  50
  51       if object do
  52         {:commit, object}
  53       else
  54         {:ignore, object}
  55       end
  56     end)
  57   end
  58
  59   def context_mapping(context) do
  60     Object.change(%Object{}, %{data: %{"id" => context}})
  61   end
  62
  63   def make_tombstone(%Object{data: %{"id" => id, "type" => type}}, deleted \\ DateTime.utc_now()) do
  64     %ObjectTombstone{
  65       id: id,
  66       formerType: type,
  67       deleted: deleted
  68     }
  69     |> Map.from_struct()
  70   end
  71
  72   def swap_object_with_tombstone(object) do
  73     tombstone = make_tombstone(object)
  74
  75     object
  76     |> Object.change(%{data: tombstone})
  77     |> Repo.update()
  78   end
  79
  80   def delete(%Object{data: %{"id" => id}} = object) do
  81     with {:ok, _obj} = swap_object_with_tombstone(object),
  82          Repo.delete_all(Activity.by_object_ap_id(id)),
  83          {:ok, true} <- Cachex.del(:object_cache, "object:#{id}") do
  84       {:ok, object}
  85     end
  86   end
  87
  88   def set_cache(%Object{data: %{"id" => ap_id}} = object) do
  89     Cachex.put(:object_cache, "object:#{ap_id}", object)
  90     {:ok, object}
  91   end
  92
  93   def update_and_set_cache(changeset) do
  94     with {:ok, object} <- Repo.update(changeset) do
  95       set_cache(object)
  96     else
  97       e -> e
  98     end
  99   end
 100 end