ensure_re_prepended.ex
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ensure_re_prepended.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.EnsureRePrepended do
	alias Pleroma.Object

	@moduledoc "Ensure a re: is prepended on replies to a post with a Subject"
	@behaviour Pleroma.Web.ActivityPub.MRF.Policy

	@reply_prefix Regex.compile!("^re:[[:space:]]*", [:caseless])

	def history_awareness, do: :auto

	def filter_by_summary(
	%{data: %{"summary" => parent_summary}} = _in_reply_to,
	%{"summary" => child_summary} = child
	)
	when not is_nil(child_summary) and byte_size(child_summary) > 0 and
	not is_nil(parent_summary) and byte_size(parent_summary) > 0 do
	if (child_summary == parent_summary and not Regex.match?(@reply_prefix, child_summary)) or
	(Regex.match?(@reply_prefix, parent_summary) &&
	Regex.replace(@reply_prefix, parent_summary, "") == child_summary) do
	Map.put(child, "summary", "re: " <> child_summary)
	else
	child
	end
	end

	def filter_by_summary(_in_reply_to, child), do: child

	def filter(%{"type" => type, "object" => child_object} = object)
	when type in ["Create", "Update"] and is_map(child_object) do
	child =
	child_object["inReplyTo"]
	\|> Object.normalize(fetch: false)
	\|> filter_by_summary(child_object)

	object = Map.put(object, "object", child)

	{:ok, object}
	end

	def filter(object), do: {:ok, object}

	def describe, do: {:ok, %{}}
	end