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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.DeleteValidator
  16
  17   @spec validate(map(), keyword()) :: {:ok, map(), keyword()} | {:error, any()}
  18   def validate(object, meta)
  19
  20   def validate(%{"type" => "Delete"} = object, meta) do
  21     with {:ok, object} <-
  22            object
  23            |> DeleteValidator.cast_and_validate()
  24            |> Ecto.Changeset.apply_action(:insert) do
  25       object = stringify_keys(object)
  26       {:ok, object, meta}
  27     end
  28   end
  29
  30   def validate(%{"type" => "Like"} = object, meta) do
  31     with {:ok, object} <-
  32            object |> LikeValidator.cast_and_validate() |> Ecto.Changeset.apply_action(:insert) do
  33       object = stringify_keys(object |> Map.from_struct())
  34       {:ok, object, meta}
  35     end
  36   end
  37
  38   def stringify_keys(%{__struct__: _} = object) do
  39     object
  40     |> Map.from_struct()
  41     |> stringify_keys
  42   end
  43
  44   def stringify_keys(object) do
  45     object
  46     |> Map.new(fn {key, val} -> {to_string(key), val} end)
  47   end
  48
  49   def fetch_actor_and_object(object) do
  50     User.get_or_fetch_by_ap_id(object["actor"])
  51     Object.normalize(object["object"])
  52     :ok
  53   end
  54 end