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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.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.User
  13   alias Pleroma.Object
  14   alias Pleroma.Web.ActivityPub.Utils
  15
  16   def validate_id(object, meta) do
  17     with {_, true} <- {:id_presence, Map.has_key?(object, "id")} do
  18       {:ok, object, meta}
  19     else
  20       e -> {:error, e}
  21     end
  22   end
  23
  24   def validate_actor(object, meta) do
  25     with {_, %User{}} <- {:actor_validation, User.get_cached_by_ap_id(object["actor"])} do
  26       {:ok, object, meta}
  27     else
  28       e -> {:error, e}
  29     end
  30   end
  31
  32   def common_validations(object, meta) do
  33     with {_, {:ok, object, meta}} <- {:validate_id, validate_id(object, meta)},
  34          {_, {:ok, object, meta}} <- {:validate_actor, validate_actor(object, meta)} do
  35       {:ok, object, meta}
  36     else
  37       e -> {:error, e}
  38     end
  39   end
  40
  41   @spec validate(map(), keyword()) :: {:ok, map(), keyword()} | {:error, any()}
  42   def validate(object, meta)
  43
  44   def validate(%{"type" => "Like"} = object, meta) do
  45     with {:ok, object, meta} <- common_validations(object, meta),
  46          {_, %Object{} = liked_object} <-
  47            {:find_liked_object, Object.normalize(object["object"])},
  48          {_, nil} <- {:existing_like, Utils.get_existing_like(object["actor"], liked_object)} do
  49       {:ok, object, meta}
  50     else
  51       e -> {:error, e}
  52     end
  53   end
  54
  55   def validate(object, meta) do
  56     common_validations(object, meta)
  57   end
  58 end