akkoma/lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex

65 lines
1.9 KiB
Elixir

# 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.HellthreadPolicy do
alias Pleroma.User
@behaviour Pleroma.Web.ActivityPub.MRF
defp delist_message(message) do
follower_collection = User.get_cached_by_ap_id(message["actor"]).follower_address
message
|> Map.put("to", [follower_collection])
|> Map.put("cc", ["https://www.w3.org/ns/activitystreams#Public"])
end
defp get_recipient_count(message) do
recipients = (message["to"] || []) ++ (message["cc"] || [])
cond do
Enum.member?(recipients, "https://www.w3.org/ns/activitystreams#Public") &&
Enum.find(recipients, &String.ends_with?(&1, "/followers")) ->
length(recipients) - 2
Enum.member?(recipients, "https://www.w3.org/ns/activitystreams#Public") ||
Enum.find(recipients, &String.ends_with?(&1, "/followers")) ->
length(recipients) - 1
true ->
length(recipients)
end
end
@impl true
def filter(%{"type" => "Create"} = message) do
delist_threshold = Pleroma.Config.get([:mrf_hellthread, :delist_threshold])
reject_threshold =
Pleroma.Config.get(
[:mrf_hellthread, :reject_threshold],
Pleroma.Config.get([:mrf_hellthread, :threshold])
)
recipients = get_recipient_count(message)
cond do
recipients > reject_threshold and reject_threshold > 0 ->
{:reject, nil}
recipients > delist_threshold and delist_threshold > 0 ->
if Enum.member?(message["to"], "https://www.w3.org/ns/activitystreams#Public") or
Enum.member?(message["cc"], "https://www.w3.org/ns/activitystreams#Public") do
{:ok, delist_message(message)}
else
{:ok, message}
end
true ->
{:ok, message}
end
end
@impl true
def filter(message), do: {:ok, message}
end