# Pleroma: A lightweight social networking server # Copyright © 2017-2020 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 @reply_prefix Regex.compile!("^re:[[:space:]]*", [:caseless]) 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" => "Create", "object" => child_object} = object) when is_map(child_object) do child = child_object["inReplyTo"] |> Object.normalize(child_object["inReplyTo"]) |> 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