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# 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
@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(
%{"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}
def describe, do: {:ok, %{}}
end
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