%%%---------------------------------------------------------------------- %%% File : mod_last.erl %%% Author : Alexey Shchepin %%% Purpose : jabber:iq:last support (XEP-0012) %%% Created : 24 Oct 2003 by Alexey Shchepin %%% %%% %%% ejabberd, Copyright (C) 2002-2021 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.")}}]}.