%%%----------------------------------------------------------------------
%%% File : mod_last.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : jabber:iq:last support (XEP-0012)
%%% Created : 24 Oct 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2022 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_last).
-author('alexey@process-one.net').
-protocol({xep, 12, '2.0'}).
-behaviour(gen_mod).
-export([start/2, stop/1, reload/3, process_local_iq/1, export/1,
process_sm_iq/1, on_presence_update/4, import_info/0,
import/5, import_start/2, store_last_info/4, get_last_info/2,
remove_user/2, mod_opt_type/1, mod_options/1, mod_doc/0,
register_user/2, depends/2, privacy_check_packet/4]).
-include("logger.hrl").
-include_lib("xmpp/include/xmpp.hrl").
-include("mod_privacy.hrl").
-include("mod_last.hrl").
-include("translate.hrl").
-define(LAST_CACHE, last_activity_cache).
-type c2s_state() :: ejabberd_c2s:state().
-callback init(binary(), gen_mod:opts()) -> any().
-callback import(binary(), #last_activity{}) -> ok | pass.
-callback get_last(binary(), binary()) ->
{ok, {non_neg_integer(), binary()}} | error | {error, any()}.
-callback store_last_info(binary(), binary(), non_neg_integer(), binary()) -> ok | {error, any()}.
-callback remove_user(binary(), binary()) -> any().
-callback use_cache(binary()) -> boolean().
-callback cache_nodes(binary()) -> [node()].
-optional_callbacks([use_cache/1, cache_nodes/1]).
start(Host, Opts) ->
Mod = gen_mod:db_mod(Opts, ?MODULE),
Mod:init(Host, Opts),
init_cache(Mod, Host, Opts),
gen_iq_handler:add_iq_handler(ejabberd_local, Host,
?NS_LAST, ?MODULE, process_local_iq),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_LAST, ?MODULE, process_sm_iq),
ejabberd_hooks:add(privacy_check_packet, Host, ?MODULE,
privacy_check_packet, 30),
ejabberd_hooks:add(register_user, Host, ?MODULE,
register_user, 50),
ejabberd_hooks:add(remove_user, Host, ?MODULE,
remove_user, 50),
ejabberd_hooks:add(unset_presence_hook, Host, ?MODULE,
on_presence_update, 50).
stop(Host) ->
ejabberd_hooks:delete(register_user, Host, ?MODULE,
register_user, 50),
ejabberd_hooks:delete(remove_user, Host, ?MODULE,
remove_user, 50),
ejabberd_hooks:delete(unset_presence_hook, Host,
?MODULE, on_presence_update, 50),
ejabberd_hooks:delete(privacy_check_packet, Host, ?MODULE,
privacy_check_packet, 30),
gen_iq_handler:remove_iq_handler(ejabberd_local, Host,
?NS_LAST),
gen_iq_handler:remove_iq_handler(ejabberd_sm, Host,
?NS_LAST).
reload(Host, NewOpts, OldOpts) ->
NewMod = gen_mod:db_mod(NewOpts, ?MODULE),
OldMod = gen_mod:db_mod(OldOpts, ?MODULE),
if NewMod /= OldMod ->
NewMod:init(Host, NewOpts);
true ->
ok
end,
init_cache(NewMod, Host, NewOpts).
%%%
%%% Uptime of ejabberd node
%%%
-spec process_local_iq(iq()) -> iq().
process_local_iq(#iq{type = set, lang = Lang} = IQ) ->
Txt = ?T("Value 'set' of 'type' attribute is not allowed"),
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang));
process_local_iq(#iq{type = get} = IQ) ->
xmpp:make_iq_result(IQ, #last{seconds = get_node_uptime()}).
-spec get_node_uptime() -> non_neg_integer().
%% @doc Get the uptime of the ejabberd node, expressed in seconds.
%% When ejabberd is starting, ejabberd_config:start/0 stores the datetime.
get_node_uptime() ->
NodeStart = ejabberd_config:get_node_start(),
erlang:monotonic_time(second) - NodeStart.
%%%
%%% Serve queries about user last online
%%%
-spec process_sm_iq(iq()) -> iq().
process_sm_iq(#iq{type = set, lang = Lang} = IQ) ->
Txt = ?T("Value 'set' of 'type' attribute is not allowed"),
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang));
process_sm_iq(#iq{from = From, to = To, lang = Lang} = IQ) ->
User = To#jid.luser,
Server = To#jid.lserver,
{Subscription, _Ask, _Groups} =
ejabberd_hooks:run_fold(roster_get_jid_info, Server,
{none, none, []}, [User, Server, From]),
if (Subscription == both) or (Subscription == from) or
(From#jid.luser == To#jid.luser) and
(From#jid.lserver == To#jid.lserver) ->
Pres = xmpp:set_from_to(#presence{}, To, From),
case ejabberd_hooks:run_fold(privacy_check_packet,
Server, allow,
[To, Pres, out]) of
allow -> get_last_iq(IQ, User, Server);
deny -> xmpp:make_error(IQ, xmpp:err_forbidden())
end;
true ->
Txt = ?T("Not subscribed"),
xmpp:make_error(IQ, xmpp:err_subscription_required(Txt, Lang))
end.
-spec privacy_check_packet(allow | deny, c2s_state(), stanza(), in | out) -> allow | deny | {stop, deny}.
privacy_check_packet(allow, C2SState,
#iq{from = From, to = To, type = T} = IQ, in)
when T == get; T == set ->
case xmpp:has_subtag(IQ, #last{}) of
true ->
#jid{luser = LUser, lserver = LServer} = To,
{Sub, _, _} = ejabberd_hooks:run_fold(
roster_get_jid_info, LServer,
{none, none, []}, [LUser, LServer, From]),
if Sub == from; Sub == both ->
Pres = #presence{from = To, to = From},
case ejabberd_hooks:run_fold(
privacy_check_packet, allow,
[C2SState, Pres, out]) of
allow ->
allow;
deny ->
{stop, deny}
end;
true ->
{stop, deny}
end;
false ->
allow
end;
privacy_check_packet(Acc, _, _, _) ->
Acc.
-spec get_last(binary(), binary()) -> {ok, non_neg_integer(), binary()} |
not_found | {error, any()}.
get_last(LUser, LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Res = case use_cache(Mod, LServer) of
true ->
ets_cache:lookup(
?LAST_CACHE, {LUser, LServer},
fun() -> Mod:get_last(LUser, LServer) end);
false ->
Mod:get_last(LUser, LServer)
end,
case Res of
{ok, {TimeStamp, Status}} -> {ok, TimeStamp, Status};
error -> not_found;
Err -> Err
end.
-spec get_last_iq(iq(), binary(), binary()) -> iq().
get_last_iq(#iq{lang = Lang} = IQ, LUser, LServer) ->
case ejabberd_sm:get_user_resources(LUser, LServer) of
[] ->
case get_last(LUser, LServer) of
{error, _Reason} ->
Txt = ?T("Database failure"),
xmpp:make_error(IQ, xmpp:err_internal_server_error(Txt, Lang));
not_found ->
Txt = ?T("No info about last activity found"),
xmpp:make_error(IQ, xmpp:err_service_unavailable(Txt, Lang));
{ok, TimeStamp, Status} ->
TimeStamp2 = erlang:system_time(second),
Sec = TimeStamp2 - TimeStamp,
xmpp:make_iq_result(IQ, #last{seconds = Sec, status = Status})
end;
_ ->
xmpp:make_iq_result(IQ, #last{seconds = 0})
end.
-spec register_user(binary(), binary()) -> any().
register_user(User, Server) ->
on_presence_update(
User,
Server,
<<"RegisterResource">>,
<<"Registered but didn't login">>).
-spec on_presence_update(binary(), binary(), binary(), binary()) -> any().
on_presence_update(User, Server, _Resource, Status) ->
TimeStamp = erlang:system_time(second),
store_last_info(User, Server, TimeStamp, Status).
-spec store_last_info(binary(), binary(), non_neg_integer(), binary()) -> any().
store_last_info(User, Server, TimeStamp, Status) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
Mod = gen_mod:db_mod(LServer, ?MODULE),
case use_cache(Mod, LServer) of
true ->
ets_cache:update(
?LAST_CACHE, {LUser, LServer}, {ok, {TimeStamp, Status}},
fun() ->
Mod:store_last_info(LUser, LServer, TimeStamp, Status)
end, cache_nodes(Mod, LServer));
false ->
Mod:store_last_info(LUser, LServer, TimeStamp, Status)
end.
-spec get_last_info(binary(), binary()) -> {ok, non_neg_integer(), binary()} |
not_found.
get_last_info(LUser, LServer) ->
case get_last(LUser, LServer) of
{error, _Reason} -> not_found;
Res -> Res
end.
-spec remove_user(binary(), binary()) -> any().
remove_user(User, Server) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:remove_user(LUser, LServer),
ets_cache:delete(?LAST_CACHE, {LUser, LServer}, cache_nodes(Mod, LServer)).
-spec init_cache(module(), binary(), gen_mod:opts()) -> ok.
init_cache(Mod, Host, Opts) ->
case use_cache(Mod, Host) of
true ->
CacheOpts = cache_opts(Opts),
ets_cache:new(?LAST_CACHE, CacheOpts);
false ->
ets_cache:delete(?LAST_CACHE)
end.
-spec cache_opts(gen_mod:opts()) -> [proplists:property()].
cache_opts(Opts) ->
MaxSize = mod_last_opt:cache_size(Opts),
CacheMissed = mod_last_opt:cache_missed(Opts),
LifeTime = mod_last_opt:cache_life_time(Opts),
[{max_size, MaxSize}, {cache_missed, CacheMissed}, {life_time, LifeTime}].
-spec use_cache(module(), binary()) -> boolean().
use_cache(Mod, Host) ->
case erlang:function_exported(Mod, use_cache, 1) of
true -> Mod:use_cache(Host);
false -> mod_last_opt:use_cache(Host)
end.
-spec cache_nodes(module(), binary()) -> [node()].
cache_nodes(Mod, Host) ->
case erlang:function_exported(Mod, cache_nodes, 1) of
true -> Mod:cache_nodes(Host);
false -> ejabberd_cluster:get_nodes()
end.
import_info() ->
[{<<"last">>, 3}].
import_start(LServer, DBType) ->
Mod = gen_mod:db_mod(DBType, ?MODULE),
Mod:init(LServer, []).
import(LServer, {sql, _}, DBType, <<"last">>, [LUser, TimeStamp, State]) ->
TS = case TimeStamp of
<<"">> -> 0;
_ -> binary_to_integer(TimeStamp)
end,
LA = #last_activity{us = {LUser, LServer},
timestamp = TS,
status = State},
Mod = gen_mod:db_mod(DBType, ?MODULE),
Mod:import(LServer, LA).
export(LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:export(LServer).
depends(_Host, _Opts) ->
[].
mod_opt_type(db_type) ->
econf:db_type(?MODULE);
mod_opt_type(use_cache) ->
econf:bool();
mod_opt_type(cache_size) ->
econf:pos_int(infinity);
mod_opt_type(cache_missed) ->
econf:bool();
mod_opt_type(cache_life_time) ->
econf:timeout(second, infinity).
mod_options(Host) ->
[{db_type, ejabberd_config:default_db(Host, ?MODULE)},
{use_cache, ejabberd_option:use_cache(Host)},
{cache_size, ejabberd_option:cache_size(Host)},
{cache_missed, ejabberd_option:cache_missed(Host)},
{cache_life_time, ejabberd_option:cache_life_time(Host)}].
mod_doc() ->
#{desc =>
?T("This module adds support for "
"https://xmpp.org/extensions/xep-0012.html"
"[XEP-0012: Last Activity]. It can be used "
"to discover when a disconnected user last accessed "
"the server, to know when a connected user was last "
"active on the server, or to query the uptime of the ejabberd server."),
opts =>
[{db_type,
#{value => "mnesia | sql",
desc =>
?T("Same as top-level _`default_db`_ option, but applied to this module only.")}},
{use_cache,
#{value => "true | false",
desc =>
?T("Same as top-level _`use_cache`_ option, but applied to this module only.")}},
{cache_size,
#{value => "pos_integer() | infinity",
desc =>
?T("Same as top-level _`cache_size`_ option, but applied to this module only.")}},
{cache_missed,
#{value => "true | false",
desc =>
?T("Same as top-level _`cache_missed`_ option, but applied to this module only.")}},
{cache_life_time,
#{value => "timeout()",
desc =>
?T("Same as top-level _`cache_life_time`_ option, but applied to this module only.")}}]}.
