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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.MRF.NoPlaceholderTextPolicy do
   6   @moduledoc "Ensure no content placeholder is present (such as the dot from mastodon)"
   7   @behaviour Pleroma.Web.ActivityPub.MRF.Policy
   8
   9   @impl true
  10   def filter(
  11         %{
  12           "type" => "Create",
  13           "object" => %{"content" => content, "attachment" => _} = _child_object
  14         } = object
  15       )
  16       when content in [".", "<p>.</p>"] do
  17     {:ok, put_in(object, ["object", "content"], "")}
  18   end
  19
  20   @impl true
  21   def filter(object), do: {:ok, object}
  22
  23   @impl true
  24   def describe, do: {:ok, %{}}
  25 end