no_placeholder_text_policy.ex
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no_placeholder_text_policy.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.MRF.NoPlaceholderTextPolicy do
	@moduledoc "Ensure no content placeholder is present (such as the dot from mastodon)"
	@behaviour Pleroma.Web.ActivityPub.MRF.Policy

	@impl true
	def history_awareness, do: :auto

	@impl true
	def filter(
	%{
	"type" => type,
	"object" => %{"content" => content, "attachment" => _} = _object
	} = activity
	)
	when type in ["Create", "Update"] and content in [".", "<p>.</p>"] do
	{:ok, put_in(activity, ["object", "content"], "")}
	end

	@impl true
	def filter(activity), do: {:ok, activity}

	@impl true
	def describe, do: {:ok, %{}}
	end