git.squeep.com Git - akkoma/blob - lib/pleroma/web/activity_pub/object_validator.ex

   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.AudioValidator
  20   alias Pleroma.Web.ActivityPub.ObjectValidators.BlockValidator
  21   alias Pleroma.Web.ActivityPub.ObjectValidators.ChatMessageValidator
  22   alias Pleroma.Web.ActivityPub.ObjectValidators.CreateChatMessageValidator
  23   alias Pleroma.Web.ActivityPub.ObjectValidators.CreateGenericValidator
  24   alias Pleroma.Web.ActivityPub.ObjectValidators.DeleteValidator
  25   alias Pleroma.Web.ActivityPub.ObjectValidators.EmojiReactValidator
  26   alias Pleroma.Web.ActivityPub.ObjectValidators.FollowValidator
  27   alias Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator
  28   alias Pleroma.Web.ActivityPub.ObjectValidators.QuestionValidator
  29   alias Pleroma.Web.ActivityPub.ObjectValidators.UndoValidator
  30   alias Pleroma.Web.ActivityPub.ObjectValidators.UpdateValidator
  31
  32   @spec validate(map(), keyword()) :: {:ok, map(), keyword()} | {:error, any()}
  33   def validate(object, meta)
  34
  35   def validate(%{"type" => type} = object, meta)
  36       when type in ~w[Accept Reject] do
  37     with {:ok, object} <-
  38            object
  39            |> AcceptRejectValidator.cast_and_validate()
  40            |> Ecto.Changeset.apply_action(:insert) do
  41       object = stringify_keys(object)
  42       {:ok, object, meta}
  43     end
  44   end
  45
  46   def validate(%{"type" => "Follow"} = object, meta) do
  47     with {:ok, object} <-
  48            object
  49            |> FollowValidator.cast_and_validate()
  50            |> Ecto.Changeset.apply_action(:insert) do
  51       object = stringify_keys(object)
  52       {:ok, object, meta}
  53     end
  54   end
  55
  56   def validate(%{"type" => "Block"} = block_activity, meta) do
  57     with {:ok, block_activity} <-
  58            block_activity
  59            |> BlockValidator.cast_and_validate()
  60            |> Ecto.Changeset.apply_action(:insert) do
  61       block_activity = stringify_keys(block_activity)
  62       outgoing_blocks = Pleroma.Config.get([:activitypub, :outgoing_blocks])
  63
  64       meta =
  65         if !outgoing_blocks do
  66           Keyword.put(meta, :do_not_federate, true)
  67         else
  68           meta
  69         end
  70
  71       {:ok, block_activity, meta}
  72     end
  73   end
  74
  75   def validate(%{"type" => "Update"} = update_activity, meta) do
  76     with {:ok, update_activity} <-
  77            update_activity
  78            |> UpdateValidator.cast_and_validate()
  79            |> Ecto.Changeset.apply_action(:insert) do
  80       update_activity = stringify_keys(update_activity)
  81       {:ok, update_activity, meta}
  82     end
  83   end
  84
  85   def validate(%{"type" => "Undo"} = object, meta) do
  86     with {:ok, object} <-
  87            object
  88            |> UndoValidator.cast_and_validate()
  89            |> Ecto.Changeset.apply_action(:insert) do
  90       object = stringify_keys(object)
  91       undone_object = Activity.get_by_ap_id(object["object"])
  92
  93       meta =
  94         meta
  95         |> Keyword.put(:object_data, undone_object.data)
  96
  97       {:ok, object, meta}
  98     end
  99   end
 100
 101   def validate(%{"type" => "Delete"} = object, meta) do
 102     with cng <- DeleteValidator.cast_and_validate(object),
 103          do_not_federate <- DeleteValidator.do_not_federate?(cng),
 104          {:ok, object} <- Ecto.Changeset.apply_action(cng, :insert) do
 105       object = stringify_keys(object)
 106       meta = Keyword.put(meta, :do_not_federate, do_not_federate)
 107       {:ok, object, meta}
 108     end
 109   end
 110
 111   def validate(%{"type" => "Like"} = object, meta) do
 112     with {:ok, object} <-
 113            object
 114            |> LikeValidator.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" => "ChatMessage"} = object, meta) do
 122     with {:ok, object} <-
 123            object
 124            |> ChatMessageValidator.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" => "Question"} = object, meta) do
 132     with {:ok, object} <-
 133            object
 134            |> QuestionValidator.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(%{"type" => "Audio"} = object, meta) do
 142     with {:ok, object} <-
 143            object
 144            |> AudioValidator.cast_and_validate()
 145            |> Ecto.Changeset.apply_action(:insert) do
 146       object = stringify_keys(object)
 147       {:ok, object, meta}
 148     end
 149   end
 150
 151   def validate(%{"type" => "Answer"} = object, meta) do
 152     with {:ok, object} <-
 153            object
 154            |> AnswerValidator.cast_and_validate()
 155            |> Ecto.Changeset.apply_action(:insert) do
 156       object = stringify_keys(object)
 157       {:ok, object, meta}
 158     end
 159   end
 160
 161   def validate(%{"type" => "EmojiReact"} = object, meta) do
 162     with {:ok, object} <-
 163            object
 164            |> EmojiReactValidator.cast_and_validate()
 165            |> Ecto.Changeset.apply_action(:insert) do
 166       object = stringify_keys(object)
 167       {:ok, object, meta}
 168     end
 169   end
 170
 171   def validate(
 172         %{"type" => "Create", "object" => %{"type" => "ChatMessage"} = object} = create_activity,
 173         meta
 174       ) do
 175     with {:ok, object_data} <- cast_and_apply(object),
 176          meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
 177          {:ok, create_activity} <-
 178            create_activity
 179            |> CreateChatMessageValidator.cast_and_validate(meta)
 180            |> Ecto.Changeset.apply_action(:insert) do
 181       create_activity = stringify_keys(create_activity)
 182       {:ok, create_activity, meta}
 183     end
 184   end
 185
 186   def validate(
 187         %{"type" => "Create", "object" => %{"type" => objtype} = object} = create_activity,
 188         meta
 189       )
 190       when objtype in ~w[Question Answer Audio] do
 191     with {:ok, object_data} <- cast_and_apply(object),
 192          meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
 193          {:ok, create_activity} <-
 194            create_activity
 195            |> CreateGenericValidator.cast_and_validate(meta)
 196            |> Ecto.Changeset.apply_action(:insert) do
 197       create_activity = stringify_keys(create_activity)
 198       {:ok, create_activity, meta}
 199     end
 200   end
 201
 202   def validate(%{"type" => "Announce"} = object, meta) do
 203     with {:ok, object} <-
 204            object
 205            |> AnnounceValidator.cast_and_validate()
 206            |> Ecto.Changeset.apply_action(:insert) do
 207       object = stringify_keys(object)
 208       {:ok, object, meta}
 209     end
 210   end
 211
 212   def cast_and_apply(%{"type" => "ChatMessage"} = object) do
 213     ChatMessageValidator.cast_and_apply(object)
 214   end
 215
 216   def cast_and_apply(%{"type" => "Question"} = object) do
 217     QuestionValidator.cast_and_apply(object)
 218   end
 219
 220   def cast_and_apply(%{"type" => "Answer"} = object) do
 221     AnswerValidator.cast_and_apply(object)
 222   end
 223
 224   def cast_and_apply(%{"type" => "Audio"} = object) do
 225     AudioValidator.cast_and_apply(object)
 226   end
 227
 228   def cast_and_apply(o), do: {:error, {:validator_not_set, o}}
 229
 230   # is_struct/1 isn't present in Elixir 1.8.x
 231   def stringify_keys(%{__struct__: _} = object) do
 232     object
 233     |> Map.from_struct()
 234     |> stringify_keys
 235   end
 236
 237   def stringify_keys(object) when is_map(object) do
 238     object
 239     |> Map.new(fn {key, val} -> {to_string(key), stringify_keys(val)} end)
 240   end
 241
 242   def stringify_keys(object) when is_list(object) do
 243     object
 244     |> Enum.map(&stringify_keys/1)
 245   end
 246
 247   def stringify_keys(object), do: object
 248
 249   def fetch_actor(object) do
 250     with {:ok, actor} <- ObjectValidators.ObjectID.cast(object["actor"]) do
 251       User.get_or_fetch_by_ap_id(actor)
 252     end
 253   end
 254
 255   def fetch_actor_and_object(object) do
 256     fetch_actor(object)
 257     Object.normalize(object["object"], true)
 258     :ok
 259   end
 260 end