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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.EctoType.ActivityPub.ObjectValidators
  13   alias Pleroma.Object
  14   alias Pleroma.User
  15   alias Pleroma.Web.ActivityPub.ObjectValidators.AnnounceValidator
  16   alias Pleroma.Web.ActivityPub.ObjectValidators.AnswerValidator
  17   alias Pleroma.Web.ActivityPub.ObjectValidators.BlockValidator
  18   alias Pleroma.Web.ActivityPub.ObjectValidators.ChatMessageValidator
  19   alias Pleroma.Web.ActivityPub.ObjectValidators.CreateChatMessageValidator
  20   alias Pleroma.Web.ActivityPub.ObjectValidators.CreateQuestionValidator
  21   alias Pleroma.Web.ActivityPub.ObjectValidators.DeleteValidator
  22   alias Pleroma.Web.ActivityPub.ObjectValidators.EmojiReactValidator
  23   alias Pleroma.Web.ActivityPub.ObjectValidators.FollowValidator
  24   alias Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator
  25   alias Pleroma.Web.ActivityPub.ObjectValidators.QuestionValidator
  26   alias Pleroma.Web.ActivityPub.ObjectValidators.UndoValidator
  27   alias Pleroma.Web.ActivityPub.ObjectValidators.UpdateValidator
  28
  29   @spec validate(map(), keyword()) :: {:ok, map(), keyword()} | {:error, any()}
  30   def validate(object, meta)
  31
  32   def validate(%{"type" => "Follow"} = object, meta) do
  33     with {:ok, object} <-
  34            object
  35            |> FollowValidator.cast_and_validate()
  36            |> Ecto.Changeset.apply_action(:insert) do
  37       object = stringify_keys(object)
  38       {:ok, object, meta}
  39     end
  40   end
  41
  42   def validate(%{"type" => "Block"} = block_activity, meta) do
  43     with {:ok, block_activity} <-
  44            block_activity
  45            |> BlockValidator.cast_and_validate()
  46            |> Ecto.Changeset.apply_action(:insert) do
  47       block_activity = stringify_keys(block_activity)
  48       outgoing_blocks = Pleroma.Config.get([:activitypub, :outgoing_blocks])
  49
  50       meta =
  51         if !outgoing_blocks do
  52           Keyword.put(meta, :do_not_federate, true)
  53         else
  54           meta
  55         end
  56
  57       {:ok, block_activity, meta}
  58     end
  59   end
  60
  61   def validate(%{"type" => "Update"} = update_activity, meta) do
  62     with {:ok, update_activity} <-
  63            update_activity
  64            |> UpdateValidator.cast_and_validate()
  65            |> Ecto.Changeset.apply_action(:insert) do
  66       update_activity = stringify_keys(update_activity)
  67       {:ok, update_activity, meta}
  68     end
  69   end
  70
  71   def validate(%{"type" => "Undo"} = object, meta) do
  72     with {:ok, object} <-
  73            object
  74            |> UndoValidator.cast_and_validate()
  75            |> Ecto.Changeset.apply_action(:insert) do
  76       object = stringify_keys(object)
  77       {:ok, object, meta}
  78     end
  79   end
  80
  81   def validate(%{"type" => "Delete"} = object, meta) do
  82     with cng <- DeleteValidator.cast_and_validate(object),
  83          do_not_federate <- DeleteValidator.do_not_federate?(cng),
  84          {:ok, object} <- Ecto.Changeset.apply_action(cng, :insert) do
  85       object = stringify_keys(object)
  86       meta = Keyword.put(meta, :do_not_federate, do_not_federate)
  87       {:ok, object, meta}
  88     end
  89   end
  90
  91   def validate(%{"type" => "Like"} = object, meta) do
  92     with {:ok, object} <-
  93            object
  94            |> LikeValidator.cast_and_validate()
  95            |> Ecto.Changeset.apply_action(:insert) do
  96       object = stringify_keys(object)
  97       {:ok, object, meta}
  98     end
  99   end
 100
 101   def validate(%{"type" => "ChatMessage"} = object, meta) do
 102     with {:ok, object} <-
 103            object
 104            |> ChatMessageValidator.cast_and_validate()
 105            |> Ecto.Changeset.apply_action(:insert) do
 106       object = stringify_keys(object)
 107       {:ok, object, meta}
 108     end
 109   end
 110
 111   def validate(%{"type" => "Question"} = object, meta) do
 112     with {:ok, object} <-
 113            object
 114            |> QuestionValidator.cast_and_validate()
 115            |> Ecto.Changeset.apply_action(:insert) do
 116       object = stringify_keys(object)
 117       {:ok, object, meta}
 118     end
 119   end
 120
 121   def validate(%{"type" => "Answer"} = object, meta) do
 122     with {:ok, object} <-
 123            object
 124            |> AnswerValidator.cast_and_validate()
 125            |> Ecto.Changeset.apply_action(:insert) do
 126       object = stringify_keys(object)
 127       {:ok, object, meta}
 128     end
 129   end
 130
 131   def validate(%{"type" => "EmojiReact"} = object, meta) do
 132     with {:ok, object} <-
 133            object
 134            |> EmojiReactValidator.cast_and_validate()
 135            |> Ecto.Changeset.apply_action(:insert) do
 136       object = stringify_keys(object)
 137       {:ok, object, meta}
 138     end
 139   end
 140
 141   def validate(
 142         %{"type" => "Create", "object" => %{"type" => "ChatMessage"} = object} = create_activity,
 143         meta
 144       ) do
 145     with {:ok, object_data} <- cast_and_apply(object),
 146          meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
 147          {:ok, create_activity} <-
 148            create_activity
 149            |> CreateChatMessageValidator.cast_and_validate(meta)
 150            |> Ecto.Changeset.apply_action(:insert) do
 151       create_activity = stringify_keys(create_activity)
 152       {:ok, create_activity, meta}
 153     end
 154   end
 155
 156   def validate(
 157         %{"type" => "Create", "object" => %{"type" => objtype} = object} = create_activity,
 158         meta
 159       )
 160       when objtype in ["Question", "Answer"] do
 161     with {:ok, object_data} <- cast_and_apply(object),
 162          meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
 163          {:ok, create_activity} <-
 164            create_activity
 165            |> CreateQuestionValidator.cast_and_validate(meta)
 166            |> Ecto.Changeset.apply_action(:insert) do
 167       create_activity = stringify_keys(create_activity)
 168       {:ok, create_activity, meta}
 169     end
 170   end
 171
 172   def validate(%{"type" => "Announce"} = object, meta) do
 173     with {:ok, object} <-
 174            object
 175            |> AnnounceValidator.cast_and_validate()
 176            |> Ecto.Changeset.apply_action(:insert) do
 177       object = stringify_keys(object)
 178       {:ok, object, meta}
 179     end
 180   end
 181
 182   def cast_and_apply(%{"type" => "ChatMessage"} = object) do
 183     ChatMessageValidator.cast_and_apply(object)
 184   end
 185
 186   def cast_and_apply(%{"type" => "Question"} = object) do
 187     QuestionValidator.cast_and_apply(object)
 188   end
 189
 190   def cast_and_apply(%{"type" => "Answer"} = object) do
 191     QuestionValidator.cast_and_apply(object)
 192   end
 193
 194   def cast_and_apply(o), do: {:error, {:validator_not_set, o}}
 195
 196   # is_struct/1 isn't present in Elixir 1.8.x
 197   def stringify_keys(%{__struct__: _} = object) do
 198     object
 199     |> Map.from_struct()
 200     |> stringify_keys
 201   end
 202
 203   def stringify_keys(object) when is_map(object) do
 204     object
 205     |> Map.new(fn {key, val} -> {to_string(key), stringify_keys(val)} end)
 206   end
 207
 208   def stringify_keys(object) when is_list(object) do
 209     object
 210     |> Enum.map(&stringify_keys/1)
 211   end
 212
 213   def stringify_keys(object), do: object
 214
 215   def fetch_actor(object) do
 216     with {:ok, actor} <- ObjectValidators.ObjectID.cast(object["actor"]) do
 217       User.get_or_fetch_by_ap_id(actor)
 218     end
 219   end
 220
 221   def fetch_actor_and_object(object) do
 222     fetch_actor(object)
 223     Object.normalize(object["object"], true)
 224     :ok
 225   end
 226 end