undo_validator.ex
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undo_validator.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Web.ActivityPub.ObjectValidators.UndoValidator do
	use Ecto.Schema

	alias Pleroma.Activity
	alias Pleroma.User

	import Ecto.Changeset
	import Pleroma.Web.ActivityPub.ObjectValidators.CommonValidations

	@primary_key false

	embedded_schema do
	quote do
	unquote do
	import Elixir.Pleroma.Web.ActivityPub.ObjectValidators.CommonFields
	message_fields()
	activity_fields()
	end
	end
	end

	def cast_and_validate(data) do
	data
	\|> cast_data()
	\|> validate_data()
	end

	def cast_data(data) do
	%__MODULE__{}
	\|> changeset(data)
	end

	def changeset(struct, data) do
	struct
	\|> cast(data, __schema__(:fields))
	end

	defp validate_data(data_cng) do
	data_cng
	\|> validate_inclusion(:type, ["Undo"])
	\|> validate_required([:id, :type, :object, :actor, :to, :cc])
	\|> validate_undo_actor(:actor)
	\|> validate_object_presence()
	\|> validate_undo_rights()
	end

	def validate_undo_rights(cng) do
	actor = get_field(cng, :actor)
	object = get_field(cng, :object)

	with %Activity{data: %{"actor" => object_actor}} <- Activity.get_by_ap_id(object),
	true <- object_actor != actor do
	cng
	\|> add_error(:actor, "not the same as object actor")
	else
	_ -> cng
	end
	end

	defp validate_undo_actor(cng, field_name) do
	validate_change(cng, field_name, fn field_name, actor ->
	case User.get_cached_by_ap_id(actor) do
	%User{} -> []
	_ -> [{field_name, "can't find user"}]
	end
	end)
	end
	end