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|
%%%-------------------------------------------------------------------
%%% File : mod_block_strangers.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Block packets from non-subscribers
%%% Created : 25 Dec 2016 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2017 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%-------------------------------------------------------------------
-module(mod_block_strangers).
-author('alexey@process-one.net').
-behaviour(gen_mod).
%% API
-export([start/2, stop/1,
depends/2, mod_opt_type/1]).
-export([filter_packet/1]).
-include("xmpp.hrl").
-include("ejabberd.hrl").
-include("logger.hrl").
-define(SETS, gb_sets).
start(Host, _Opts) ->
ejabberd_hooks:add(user_receive_packet, Host,
?MODULE, filter_packet, 25),
ok.
stop(Host) ->
ejabberd_hooks:delete(user_receive_packet, Host,
?MODULE, filter_packet, 25),
ok.
filter_packet({#message{} = Msg, State} = Acc) ->
From = xmpp:get_from(Msg),
LFrom = jid:tolower(From),
LBFrom = jid:remove_resource(LFrom),
#{pres_a := PresA} = State,
case (Msg#message.body == [] andalso
Msg#message.subject == [])
orelse ejabberd_router:is_my_route(From#jid.lserver)
orelse (?SETS):is_element(LFrom, PresA)
orelse (?SETS):is_element(LBFrom, PresA)
orelse sets_bare_member(LBFrom, PresA) of
true ->
Acc;
false ->
#{lserver := LServer} = State,
Drop =
gen_mod:get_module_opt(LServer, ?MODULE, drop,
fun(B) when is_boolean(B) -> B end,
true),
Log =
gen_mod:get_module_opt(LServer, ?MODULE, log,
fun(B) when is_boolean(B) -> B end,
false),
if
Log ->
?INFO_MSG("Drop packet: ~s",
[fxml:element_to_binary(
xmpp:encode(Msg, ?NS_CLIENT))]);
true ->
ok
end,
if
Drop ->
{stop, {drop, State}};
true ->
Acc
end
end;
filter_packet(Acc) ->
Acc.
sets_bare_member({U, S, <<"">>} = LBJID, Set) ->
case ?SETS:next(sets_iterator_from(LBJID, Set)) of
{{U, S, _}, _} -> true;
_ -> false
end.
-ifdef(GB_SETS_ITERATOR_FROM).
sets_iterator_from(Element, Set) ->
?SETS:iterator_from(Element, Set).
-else.
%% Copied from gb_sets.erl
%% TODO: Remove after dropping R17 support
sets_iterator_from(S, {_, T}) ->
iterator_from(S, T, []).
iterator_from(S, {K, _, T}, As) when K < S ->
iterator_from(S, T, As);
iterator_from(_, {_, nil, _} = T, As) ->
[T | As];
iterator_from(S, {_, L, _} = T, As) ->
iterator_from(S, L, [T | As]);
iterator_from(_, nil, As) ->
As.
-endif.
depends(_Host, _Opts) ->
[].
mod_opt_type(drop) ->
fun (B) when is_boolean(B) -> B end;
mod_opt_type(log) ->
fun (B) when is_boolean(B) -> B end;
mod_opt_type(_) -> [drop, log].
|
