fo_direct_reply.ex
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fo_direct_reply.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.FODirectReply do
	@moduledoc """
	FODirectReply alters the scope of replies to activities which are Followers Only to be Direct. The purpose of this policy is to prevent broken threads for followers of the reply author because their response was to a user that they are not also following.
	"""

	alias Pleroma.Object
	alias Pleroma.User
	alias Pleroma.Web.ActivityPub.Visibility

	@behaviour Pleroma.Web.ActivityPub.MRF.Policy

	@impl true
	def filter(
	%{
	"type" => "Create",
	"to" => to,
	"object" => %{
	"actor" => actor,
	"type" => "Note",
	"inReplyTo" => in_reply_to
	}
	} = activity
	) do
	with true <- is_binary(in_reply_to),
	%User{follower_address: followers_collection, local: true} <- User.get_by_ap_id(actor),
	%Object{} = in_reply_to_object <- Object.get_by_ap_id(in_reply_to),
	"private" <- Visibility.get_visibility(in_reply_to_object) do
	direct_to = to -- [followers_collection]

	updated_activity =
	activity
	\|> Map.put("cc", [])
	\|> Map.put("to", direct_to)
	\|> Map.put("directMessage", true)
	\|> put_in(["object", "cc"], [])
	\|> put_in(["object", "to"], direct_to)

	{:ok, updated_activity}
	else
	_ -> {:ok, activity}
	end
	end

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

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