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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2018 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.ActivityPub.MRF.EnsureRePrepended do
   6   alias Pleroma.Object
   7
   8   @behaviour Pleroma.Web.ActivityPub.MRF
   9
  10   @reply_prefix Regex.compile!("^re:[[:space:]]*", [:caseless])
  11   def filter_by_summary(
  12         %{"summary" => parent_summary} = _parent,
  13         %{"summary" => child_summary} = child
  14       )
  15       when not is_nil(child_summary) and byte_size(child_summary) > 0 and
  16              not is_nil(parent_summary) and byte_size(parent_summary) > 0 do
  17     if (child_summary == parent_summary and not Regex.match?(@reply_prefix, child_summary)) or
  18          (Regex.match?(@reply_prefix, parent_summary) &&
  19             Regex.replace(@reply_prefix, parent_summary, "") == child_summary) do
  20       Map.put(child, "summary", "re: " <> child_summary)
  21     else
  22       child
  23     end
  24   end
  25
  26   def filter_by_summary(_parent, child), do: child
  27
  28   def filter(%{"type" => activity_type} = object) when activity_type == "Create" do
  29     child = object["object"]
  30     in_reply_to = Object.normalize(child["inReplyTo"])
  31
  32     child =
  33       if(in_reply_to,
  34         do: filter_by_summary(in_reply_to.data, child),
  35         else: child
  36       )
  37
  38     object = Map.put(object, "object", child)
  39
  40     {:ok, object}
  41   end
  42
  43   def filter(object), do: {:ok, object}
  44 end