# Pleroma: A lightweight social networking server # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Web.ActivityPub.MRF.EnsureRePrepended do alias Pleroma.Object @behaviour Pleroma.Web.ActivityPub.MRF @reply_prefix Regex.compile!("^re:[[:space:]]*", [:caseless]) def filter_by_summary( %{"summary" => parent_summary} = _parent, %{"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(_parent, child), do: child def filter(%{"type" => activity_type} = object) when activity_type == "Create" do child = object["object"] in_reply_to = Object.normalize(child["inReplyTo"]) child = if(in_reply_to, do: filter_by_summary(in_reply_to.data, child), else: child ) object = Map.put(object, "object", child) {:ok, object} end def filter(object), do: {:ok, object} end