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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 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   @behaviour Pleroma.Web.ActivityPub.ObjectValidator.Validating
  13
  14   alias Pleroma.Activity
  15   alias Pleroma.EctoType.ActivityPub.ObjectValidators
  16   alias Pleroma.Object
  17   alias Pleroma.Object.Containment
  18   alias Pleroma.User
  19   alias Pleroma.Web.ActivityPub.ObjectValidators.AcceptRejectValidator
  20   alias Pleroma.Web.ActivityPub.ObjectValidators.AnnounceValidator
  21   alias Pleroma.Web.ActivityPub.ObjectValidators.AnswerValidator
  22   alias Pleroma.Web.ActivityPub.ObjectValidators.ArticleNoteValidator
  23   alias Pleroma.Web.ActivityPub.ObjectValidators.AudioVideoValidator
  24   alias Pleroma.Web.ActivityPub.ObjectValidators.BlockValidator
  25   alias Pleroma.Web.ActivityPub.ObjectValidators.ChatMessageValidator
  26   alias Pleroma.Web.ActivityPub.ObjectValidators.CreateChatMessageValidator
  27   alias Pleroma.Web.ActivityPub.ObjectValidators.CreateGenericValidator
  28   alias Pleroma.Web.ActivityPub.ObjectValidators.DeleteValidator
  29   alias Pleroma.Web.ActivityPub.ObjectValidators.EmojiReactValidator
  30   alias Pleroma.Web.ActivityPub.ObjectValidators.EventValidator
  31   alias Pleroma.Web.ActivityPub.ObjectValidators.FollowValidator
  32   alias Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator
  33   alias Pleroma.Web.ActivityPub.ObjectValidators.PinValidator
  34   alias Pleroma.Web.ActivityPub.ObjectValidators.QuestionValidator
  35   alias Pleroma.Web.ActivityPub.ObjectValidators.UndoValidator
  36   alias Pleroma.Web.ActivityPub.ObjectValidators.UpdateValidator
  37
  38   @impl true
  39   def validate(object, meta)
  40
  41   def validate(%{"type" => type} = object, meta)
  42       when type in ~w[Accept Reject] do
  43     with {:ok, object} <-
  44            object
  45            |> AcceptRejectValidator.cast_and_validate()
  46            |> Ecto.Changeset.apply_action(:insert) do
  47       object = stringify_keys(object)
  48       {:ok, object, meta}
  49     end
  50   end
  51
  52   def validate(%{"type" => "Event"} = object, meta) do
  53     with {:ok, object} <-
  54            object
  55            |> EventValidator.cast_and_validate()
  56            |> Ecto.Changeset.apply_action(:insert) do
  57       object = stringify_keys(object)
  58       {:ok, object, meta}
  59     end
  60   end
  61
  62   def validate(%{"type" => "Follow"} = object, meta) do
  63     with {:ok, object} <-
  64            object
  65            |> FollowValidator.cast_and_validate()
  66            |> Ecto.Changeset.apply_action(:insert) do
  67       object = stringify_keys(object)
  68       {:ok, object, meta}
  69     end
  70   end
  71
  72   def validate(%{"type" => "Block"} = block_activity, meta) do
  73     with {:ok, block_activity} <-
  74            block_activity
  75            |> BlockValidator.cast_and_validate()
  76            |> Ecto.Changeset.apply_action(:insert) do
  77       block_activity = stringify_keys(block_activity)
  78       outgoing_blocks = Pleroma.Config.get([:activitypub, :outgoing_blocks])
  79
  80       meta =
  81         if !outgoing_blocks do
  82           Keyword.put(meta, :do_not_federate, true)
  83         else
  84           meta
  85         end
  86
  87       {:ok, block_activity, meta}
  88     end
  89   end
  90
  91   def validate(%{"type" => "Update"} = update_activity, meta) do
  92     with {:ok, update_activity} <-
  93            update_activity
  94            |> UpdateValidator.cast_and_validate()
  95            |> Ecto.Changeset.apply_action(:insert) do
  96       update_activity = stringify_keys(update_activity)
  97       {:ok, update_activity, meta}
  98     end
  99   end
 100
 101   def validate(%{"type" => "Undo"} = object, meta) do
 102     with {:ok, object} <-
 103            object
 104            |> UndoValidator.cast_and_validate()
 105            |> Ecto.Changeset.apply_action(:insert) do
 106       object = stringify_keys(object)
 107       undone_object = Activity.get_by_ap_id(object["object"])
 108
 109       meta =
 110         meta
 111         |> Keyword.put(:object_data, undone_object.data)
 112
 113       {:ok, object, meta}
 114     end
 115   end
 116
 117   def validate(%{"type" => "Delete"} = object, meta) do
 118     with cng <- DeleteValidator.cast_and_validate(object),
 119          do_not_federate <- DeleteValidator.do_not_federate?(cng),
 120          {:ok, object} <- Ecto.Changeset.apply_action(cng, :insert) do
 121       object = stringify_keys(object)
 122       meta = Keyword.put(meta, :do_not_federate, do_not_federate)
 123       {:ok, object, meta}
 124     end
 125   end
 126
 127   def validate(%{"type" => "Like"} = object, meta) do
 128     with {:ok, object} <-
 129            object
 130            |> LikeValidator.cast_and_validate()
 131            |> Ecto.Changeset.apply_action(:insert) do
 132       object = stringify_keys(object)
 133       {:ok, object, meta}
 134     end
 135   end
 136
 137   def validate(%{"type" => "ChatMessage"} = object, meta) do
 138     with {:ok, object} <-
 139            object
 140            |> ChatMessageValidator.cast_and_validate()
 141            |> Ecto.Changeset.apply_action(:insert) do
 142       object = stringify_keys(object)
 143       {:ok, object, meta}
 144     end
 145   end
 146
 147   def validate(%{"type" => "Question"} = object, meta) do
 148     with {:ok, object} <-
 149            object
 150            |> QuestionValidator.cast_and_validate()
 151            |> Ecto.Changeset.apply_action(:insert) do
 152       object = stringify_keys(object)
 153       {:ok, object, meta}
 154     end
 155   end
 156
 157   def validate(%{"type" => type} = object, meta) when type in ~w[Audio Video] do
 158     with {:ok, object} <-
 159            object
 160            |> AudioVideoValidator.cast_and_validate()
 161            |> Ecto.Changeset.apply_action(:insert) do
 162       object = stringify_keys(object)
 163       {:ok, object, meta}
 164     end
 165   end
 166
 167   def validate(%{"type" => "Article"} = object, meta) do
 168     with {:ok, object} <-
 169            object
 170            |> ArticleNoteValidator.cast_and_validate()
 171            |> Ecto.Changeset.apply_action(:insert) do
 172       object = stringify_keys(object)
 173       {:ok, object, meta}
 174     end
 175   end
 176
 177   def validate(%{"type" => "Answer"} = object, meta) do
 178     with {:ok, object} <-
 179            object
 180            |> AnswerValidator.cast_and_validate()
 181            |> Ecto.Changeset.apply_action(:insert) do
 182       object = stringify_keys(object)
 183       {:ok, object, meta}
 184     end
 185   end
 186
 187   def validate(%{"type" => "EmojiReact"} = object, meta) do
 188     with {:ok, object} <-
 189            object
 190            |> EmojiReactValidator.cast_and_validate()
 191            |> Ecto.Changeset.apply_action(:insert) do
 192       object = stringify_keys(object)
 193       {:ok, object, meta}
 194     end
 195   end
 196
 197   def validate(
 198         %{"type" => "Create", "object" => %{"type" => "ChatMessage"} = object} = create_activity,
 199         meta
 200       ) do
 201     with {:ok, object_data} <- cast_and_apply(object),
 202          meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
 203          {:ok, create_activity} <-
 204            create_activity
 205            |> CreateChatMessageValidator.cast_and_validate(meta)
 206            |> Ecto.Changeset.apply_action(:insert) do
 207       create_activity = stringify_keys(create_activity)
 208       {:ok, create_activity, meta}
 209     end
 210   end
 211
 212   def validate(
 213         %{"type" => "Create", "object" => %{"type" => objtype} = object} = create_activity,
 214         meta
 215       )
 216       when objtype in ~w[Question Answer Audio Video Event Article] do
 217     with {:ok, object_data} <- cast_and_apply(object),
 218          meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
 219          {:ok, create_activity} <-
 220            create_activity
 221            |> CreateGenericValidator.cast_and_validate(meta)
 222            |> Ecto.Changeset.apply_action(:insert) do
 223       create_activity = stringify_keys(create_activity)
 224       {:ok, create_activity, meta}
 225     end
 226   end
 227
 228   def validate(%{"type" => "Announce"} = object, meta) do
 229     with {:ok, object} <-
 230            object
 231            |> AnnounceValidator.cast_and_validate()
 232            |> Ecto.Changeset.apply_action(:insert) do
 233       object = stringify_keys(object)
 234       {:ok, object, meta}
 235     end
 236   end
 237
 238   def validate(%{"type" => type} = object, meta) when type in ~w(Add Remove) do
 239     with {:ok, object} <-
 240            object
 241            |> PinValidator.cast_and_validate()
 242            |> Ecto.Changeset.apply_action(:insert) do
 243       object = stringify_keys(object)
 244       {:ok, object, meta}
 245     end
 246   end
 247
 248   def cast_and_apply(%{"type" => "ChatMessage"} = object) do
 249     ChatMessageValidator.cast_and_apply(object)
 250   end
 251
 252   def cast_and_apply(%{"type" => "Question"} = object) do
 253     QuestionValidator.cast_and_apply(object)
 254   end
 255
 256   def cast_and_apply(%{"type" => "Answer"} = object) do
 257     AnswerValidator.cast_and_apply(object)
 258   end
 259
 260   def cast_and_apply(%{"type" => type} = object) when type in ~w[Audio Video] do
 261     AudioVideoValidator.cast_and_apply(object)
 262   end
 263
 264   def cast_and_apply(%{"type" => "Event"} = object) do
 265     EventValidator.cast_and_apply(object)
 266   end
 267
 268   def cast_and_apply(%{"type" => "Article"} = object) do
 269     ArticleNoteValidator.cast_and_apply(object)
 270   end
 271
 272   def cast_and_apply(o), do: {:error, {:validator_not_set, o}}
 273
 274   # is_struct/1 isn't present in Elixir 1.8.x
 275   def stringify_keys(%{__struct__: _} = object) do
 276     object
 277     |> Map.from_struct()
 278     |> stringify_keys
 279   end
 280
 281   def stringify_keys(object) when is_map(object) do
 282     object
 283     |> Map.new(fn {key, val} -> {to_string(key), stringify_keys(val)} end)
 284   end
 285
 286   def stringify_keys(object) when is_list(object) do
 287     object
 288     |> Enum.map(&stringify_keys/1)
 289   end
 290
 291   def stringify_keys(object), do: object
 292
 293   def fetch_actor(object) do
 294     with actor <- Containment.get_actor(object),
 295          {:ok, actor} <- ObjectValidators.ObjectID.cast(actor) do
 296       User.get_or_fetch_by_ap_id(actor)
 297     end
 298   end
 299
 300   def fetch_actor_and_object(object) do
 301     fetch_actor(object)
 302     Object.normalize(object["object"], fetch: true)
 303     :ok
 304   end
 305 end