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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.ActivityPub.ObjectValidator do
   6   @moduledoc """
   7   This module is responsible for validating an object (which can be an activity)
   8   and checking if it is both well formed and also compatible with our view of
   9   the system.
  10   """
  11
  12   alias Pleroma.Object
  13   alias Pleroma.User
  14   alias Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator
  15   alias Pleroma.Web.ActivityPub.ObjectValidators.UndoValidator
  16
  17   @spec validate(map(), keyword()) :: {:ok, map(), keyword()} | {:error, any()}
  18   def validate(object, meta)
  19
  20   def validate(%{"type" => "Undo"} = object, meta) do
  21     with {:ok, object} <-
  22            object |> UndoValidator.cast_and_validate() |> Ecto.Changeset.apply_action(:insert) do
  23       object = stringify_keys(object |> Map.from_struct())
  24       {:ok, object, meta}
  25     end
  26   end
  27
  28   def validate(%{"type" => "Like"} = object, meta) do
  29     with {:ok, object} <-
  30            object |> LikeValidator.cast_and_validate() |> Ecto.Changeset.apply_action(:insert) do
  31       object = stringify_keys(object |> Map.from_struct())
  32       {:ok, object, meta}
  33     end
  34   end
  35
  36   def stringify_keys(object) do
  37     object
  38     |> Map.new(fn {key, val} -> {to_string(key), val} end)
  39   end
  40
  41   def fetch_actor_and_object(object) do
  42     User.get_or_fetch_by_ap_id(object["actor"])
  43     Object.normalize(object["object"])
  44     :ok
  45   end
  46 end