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

   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.ObjectValidators.UpdateValidator do
   6   use Ecto.Schema
   7
   8   alias Pleroma.EctoType.ActivityPub.ObjectValidators
   9
  10   import Ecto.Changeset
  11   import Pleroma.Web.ActivityPub.ObjectValidators.CommonValidations
  12
  13   @primary_key false
  14
  15   embedded_schema do
  16     quote do
  17       unquote do
  18         import Elixir.Pleroma.Web.ActivityPub.ObjectValidators.CommonFields
  19         message_fields()
  20       end
  21     end
  22
  23     field(:actor, ObjectValidators.ObjectID)
  24     # In this case, we save the full object in this activity instead of just a
  25     # reference, so we can always see what was actually changed by this.
  26     field(:object, :map)
  27   end
  28
  29   def cast_data(data) do
  30     %__MODULE__{}
  31     |> cast(data, __schema__(:fields))
  32   end
  33
  34   defp validate_data(cng) do
  35     cng
  36     |> validate_required([:id, :type, :actor, :to, :cc, :object])
  37     |> validate_inclusion(:type, ["Update"])
  38     |> validate_actor_presence()
  39     |> validate_updating_rights()
  40   end
  41
  42   def cast_and_validate(data) do
  43     data
  44     |> cast_data
  45     |> validate_data
  46   end
  47
  48   # For now we only support updating users, and here the rule is easy:
  49   # object id == actor id
  50   def validate_updating_rights(cng) do
  51     with actor = get_field(cng, :actor),
  52          object = get_field(cng, :object),
  53          {:ok, object_id} <- ObjectValidators.ObjectID.cast(object),
  54          true <- actor == object_id do
  55       cng
  56     else
  57       _e ->
  58         cng
  59         |> add_error(:object, "Can't be updated by this actor")
  60     end
  61   end
  62 end