force_mention.ex
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force_mention.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2024 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Web.ActivityPub.MRF.ForceMention do
	require Pleroma.Constants

	alias Pleroma.Config
	alias Pleroma.Object
	alias Pleroma.User

	@behaviour Pleroma.Web.ActivityPub.MRF.Policy

	defp get_author(url) do
	with %Object{data: %{"actor" => actor}} <- Object.normalize(url, fetch: false),
	%User{ap_id: ap_id, nickname: nickname} <- User.get_cached_by_ap_id(actor) do
	%{"type" => "Mention", "href" => ap_id, "name" => "@#{nickname}"}
	else
	_ -> nil
	end
	end

	defp prepend_author(tags, _, false), do: tags

	defp prepend_author(tags, nil, _), do: tags

	defp prepend_author(tags, url, _) do
	actor = get_author(url)

	if not is_nil(actor) do
	[actor \| tags]
	else
	tags
	end
	end

	@impl true
	def filter(%{"type" => "Create", "object" => %{"tag" => tag} = object} = activity) do
	tag =
	tag
	\|> prepend_author(
	object["inReplyTo"],
	Config.get([:mrf_force_mention, :mention_parent, true])
	)
	\|> prepend_author(
	object["quoteUrl"],
	Config.get([:mrf_force_mention, :mention_quoted, true])
	)
	\|> Enum.uniq()

	{:ok, put_in(activity["object"]["tag"], tag)}
	end

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

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