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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.Activity
  13   alias Pleroma.EctoType.ActivityPub.ObjectValidators
  14   alias Pleroma.Object
  15   alias Pleroma.User
  16   alias Pleroma.Web.ActivityPub.ObjectValidators.AcceptRejectValidator
  17   alias Pleroma.Web.ActivityPub.ObjectValidators.AnnounceValidator
  18   alias Pleroma.Web.ActivityPub.ObjectValidators.AnswerValidator
  19   alias Pleroma.Web.ActivityPub.ObjectValidators.BlockValidator
  20   alias Pleroma.Web.ActivityPub.ObjectValidators.ChatMessageValidator
  21   alias Pleroma.Web.ActivityPub.ObjectValidators.CreateChatMessageValidator
  22   alias Pleroma.Web.ActivityPub.ObjectValidators.CreateGenericValidator
  23   alias Pleroma.Web.ActivityPub.ObjectValidators.DeleteValidator
  24   alias Pleroma.Web.ActivityPub.ObjectValidators.EmojiReactValidator
  25   alias Pleroma.Web.ActivityPub.ObjectValidators.FollowValidator
  26   alias Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator
  27   alias Pleroma.Web.ActivityPub.ObjectValidators.QuestionValidator
  28   alias Pleroma.Web.ActivityPub.ObjectValidators.UndoValidator
  29   alias Pleroma.Web.ActivityPub.ObjectValidators.UpdateValidator
  30
  31   @spec validate(map(), keyword()) :: {:ok, map(), keyword()} | {:error, any()}
  32   def validate(object, meta)
  33
  34   def validate(%{"type" => type} = object, meta)
  35       when type in ~w[Accept Reject] do
  36     with {:ok, object} <-
  37            object
  38            |> AcceptRejectValidator.cast_and_validate()
  39            |> Ecto.Changeset.apply_action(:insert) do
  40       object = stringify_keys(object)
  41       {:ok, object, meta}
  42     end
  43   end
  44
  45   def validate(%{"type" => "Follow"} = object, meta) do
  46     with {:ok, object} <-
  47            object
  48            |> FollowValidator.cast_and_validate()
  49            |> Ecto.Changeset.apply_action(:insert) do
  50       object = stringify_keys(object)
  51       {:ok, object, meta}
  52     end
  53   end
  54
  55   def validate(%{"type" => "Block"} = block_activity, meta) do
  56     with {:ok, block_activity} <-
  57            block_activity
  58            |> BlockValidator.cast_and_validate()
  59            |> Ecto.Changeset.apply_action(:insert) do
  60       block_activity = stringify_keys(block_activity)
  61       outgoing_blocks = Pleroma.Config.get([:activitypub, :outgoing_blocks])
  62
  63       meta =
  64         if !outgoing_blocks do
  65           Keyword.put(meta, :do_not_federate, true)
  66         else
  67           meta
  68         end
  69
  70       {:ok, block_activity, meta}
  71     end
  72   end
  73
  74   def validate(%{"type" => "Update"} = update_activity, meta) do
  75     with {:ok, update_activity} <-
  76            update_activity
  77            |> UpdateValidator.cast_and_validate()
  78            |> Ecto.Changeset.apply_action(:insert) do
  79       update_activity = stringify_keys(update_activity)
  80       {:ok, update_activity, meta}
  81     end
  82   end
  83
  84   def validate(%{"type" => "Undo"} = object, meta) do
  85     with {:ok, object} <-
  86            object
  87            |> UndoValidator.cast_and_validate()
  88            |> Ecto.Changeset.apply_action(:insert) do
  89       object = stringify_keys(object)
  90       undone_object = Activity.get_by_ap_id(object["object"])
  91
  92       meta =
  93         meta
  94         |> Keyword.put(:object_data, undone_object.data)
  95
  96       {:ok, object, meta}
  97     end
  98   end
  99
 100   def validate(%{"type" => "Delete"} = object, meta) do
 101     with cng <- DeleteValidator.cast_and_validate(object),
 102          do_not_federate <- DeleteValidator.do_not_federate?(cng),
 103          {:ok, object} <- Ecto.Changeset.apply_action(cng, :insert) do
 104       object = stringify_keys(object)
 105       meta = Keyword.put(meta, :do_not_federate, do_not_federate)
 106       {:ok, object, meta}
 107     end
 108   end
 109
 110   def validate(%{"type" => "Like"} = object, meta) do
 111     with {:ok, object} <-
 112            object
 113            |> LikeValidator.cast_and_validate()
 114            |> Ecto.Changeset.apply_action(:insert) do
 115       object = stringify_keys(object)
 116       {:ok, object, meta}
 117     end
 118   end
 119
 120   def validate(%{"type" => "ChatMessage"} = object, meta) do
 121     with {:ok, object} <-
 122            object
 123            |> ChatMessageValidator.cast_and_validate()
 124            |> Ecto.Changeset.apply_action(:insert) do
 125       object = stringify_keys(object)
 126       {:ok, object, meta}
 127     end
 128   end
 129
 130   def validate(%{"type" => "Question"} = object, meta) do
 131     with {:ok, object} <-
 132            object
 133            |> QuestionValidator.cast_and_validate()
 134            |> Ecto.Changeset.apply_action(:insert) do
 135       object = stringify_keys(object)
 136       {:ok, object, meta}
 137     end
 138   end
 139
 140   def validate(%{"type" => "Answer"} = object, meta) do
 141     with {:ok, object} <-
 142            object
 143            |> AnswerValidator.cast_and_validate()
 144            |> Ecto.Changeset.apply_action(:insert) do
 145       object = stringify_keys(object)
 146       {:ok, object, meta}
 147     end
 148   end
 149
 150   def validate(%{"type" => "EmojiReact"} = object, meta) do
 151     with {:ok, object} <-
 152            object
 153            |> EmojiReactValidator.cast_and_validate()
 154            |> Ecto.Changeset.apply_action(:insert) do
 155       object = stringify_keys(object)
 156       {:ok, object, meta}
 157     end
 158   end
 159
 160   def validate(
 161         %{"type" => "Create", "object" => %{"type" => "ChatMessage"} = object} = create_activity,
 162         meta
 163       ) do
 164     with {:ok, object_data} <- cast_and_apply(object),
 165          meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
 166          {:ok, create_activity} <-
 167            create_activity
 168            |> CreateChatMessageValidator.cast_and_validate(meta)
 169            |> Ecto.Changeset.apply_action(:insert) do
 170       create_activity = stringify_keys(create_activity)
 171       {:ok, create_activity, meta}
 172     end
 173   end
 174
 175   def validate(
 176         %{"type" => "Create", "object" => %{"type" => objtype} = object} = create_activity,
 177         meta
 178       )
 179       when objtype in ["Question", "Answer"] do
 180     with {:ok, object_data} <- cast_and_apply(object),
 181          meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
 182          {:ok, create_activity} <-
 183            create_activity
 184            |> CreateGenericValidator.cast_and_validate(meta)
 185            |> Ecto.Changeset.apply_action(:insert) do
 186       create_activity = stringify_keys(create_activity)
 187       {:ok, create_activity, meta}
 188     end
 189   end
 190
 191   def validate(%{"type" => "Announce"} = object, meta) do
 192     with {:ok, object} <-
 193            object
 194            |> AnnounceValidator.cast_and_validate()
 195            |> Ecto.Changeset.apply_action(:insert) do
 196       object = stringify_keys(object)
 197       {:ok, object, meta}
 198     end
 199   end
 200
 201   def cast_and_apply(%{"type" => "ChatMessage"} = object) do
 202     ChatMessageValidator.cast_and_apply(object)
 203   end
 204
 205   def cast_and_apply(%{"type" => "Question"} = object) do
 206     QuestionValidator.cast_and_apply(object)
 207   end
 208
 209   def cast_and_apply(%{"type" => "Answer"} = object) do
 210     AnswerValidator.cast_and_apply(object)
 211   end
 212
 213   def cast_and_apply(o), do: {:error, {:validator_not_set, o}}
 214
 215   # is_struct/1 isn't present in Elixir 1.8.x
 216   def stringify_keys(%{__struct__: _} = object) do
 217     object
 218     |> Map.from_struct()
 219     |> stringify_keys
 220   end
 221
 222   def stringify_keys(object) when is_map(object) do
 223     object
 224     |> Map.new(fn {key, val} -> {to_string(key), stringify_keys(val)} end)
 225   end
 226
 227   def stringify_keys(object) when is_list(object) do
 228     object
 229     |> Enum.map(&stringify_keys/1)
 230   end
 231
 232   def stringify_keys(object), do: object
 233
 234   def fetch_actor(object) do
 235     with {:ok, actor} <- ObjectValidators.ObjectID.cast(object["actor"]) do
 236       User.get_or_fetch_by_ap_id(actor)
 237     end
 238   end
 239
 240   def fetch_actor_and_object(object) do
 241     fetch_actor(object)
 242     Object.normalize(object["object"], true)
 243     :ok
 244   end
 245 end