Commit 54ec6d09 authored by kaniini's avatar kaniini

mrf: add anti-followbot policy

parent 4983e6e9
# Pleroma: A lightweight social networking server
# Copyright © 2019 Pleroma Authors <>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.MRF.AntiFollowbotPolicy do
alias Pleroma.User
@behaviour Pleroma.Web.ActivityPub.MRF
# XXX: this should become User.normalize_by_ap_id() or similar, really.
defp normalize_by_ap_id(%{"id" => id}), do: User.get_cached_by_ap_id(id)
defp normalize_by_ap_id(uri) when is_binary(uri), do: User.get_cached_by_ap_id(uri)
defp normalize_by_ap_id(_), do: nil
defp score_nickname("followbot@" <> _), do: 1.0
defp score_nickname("federationbot@" <> _), do: 1.0
defp score_nickname("federation_bot@" <> _), do: 1.0
defp score_nickname(_), do: 0.0
defp score_displayname("federation bot"), do: 1.0
defp score_displayname("federationbot"), do: 1.0
defp score_displayname("fedibot"), do: 1.0
defp score_displayname(_), do: 0.0
defp determine_if_followbot(%User{nickname: nickname, name: displayname}) do
nick_score =
|> String.downcase()
|> score_nickname()
name_score =
|> String.downcase()
|> score_displayname()
nick_score + name_score
defp determine_if_followbot(_), do: 0.0
@impl true
def filter(%{"type" => "Follow", "actor" => actor_id} = message) do
%User{} = actor = normalize_by_ap_id(actor_id)
score = determine_if_followbot(actor)
# TODO: scan biography data for keywords and score it somehow.
if score < 0.8 do
{:ok, message}
{:reject, nil}
@impl true
def filter(message), do: {:ok, message}
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