283 lines
8.7 KiB
Erlang
283 lines
8.7 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : mod_last.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : jabber:iq:last support (JEP-0012)
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%%% Created : 24 Oct 2003 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2010 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%----------------------------------------------------------------------
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-module(mod_last).
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-author('alexey@process-one.net').
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-behaviour(gen_mod).
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-export([start/2,
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stop/1,
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process_local_iq/3,
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process_sm_iq/3,
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on_presence_update/4,
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store_last_info/4,
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get_last_info/2,
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remove_user/2]).
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-include_lib("exmpp/include/exmpp.hrl").
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-include("ejabberd.hrl").
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-include("mod_privacy.hrl").
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-record(last_activity, {us, timestamp, status}).
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start(Host, Opts) ->
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HostB = list_to_binary(Host),
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IQDisc = gen_mod:get_opt(iqdisc, Opts, one_queue),
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mnesia:create_table(last_activity,
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[{disc_copies, [node()]},
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{attributes, record_info(fields, last_activity)}]),
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update_table(),
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gen_iq_handler:add_iq_handler(ejabberd_local, HostB, ?NS_LAST_ACTIVITY,
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?MODULE, process_local_iq, IQDisc),
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gen_iq_handler:add_iq_handler(ejabberd_sm, HostB, ?NS_LAST_ACTIVITY,
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?MODULE, process_sm_iq, IQDisc),
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ejabberd_hooks:add(remove_user, HostB,
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?MODULE, remove_user, 50),
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ejabberd_hooks:add(unset_presence_hook, HostB,
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?MODULE, on_presence_update, 50).
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stop(Host) ->
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HostB = list_to_binary(Host),
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ejabberd_hooks:delete(remove_user, HostB,
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?MODULE, remove_user, 50),
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ejabberd_hooks:delete(unset_presence_hook, HostB,
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?MODULE, on_presence_update, 50),
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gen_iq_handler:remove_iq_handler(ejabberd_local, HostB, ?NS_LAST_ACTIVITY),
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gen_iq_handler:remove_iq_handler(ejabberd_sm, HostB, ?NS_LAST_ACTIVITY).
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%%%
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%%% Uptime of ejabberd node
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%%%
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process_local_iq(_From, _To, #iq{type = get} = IQ_Rec) ->
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Sec = get_node_uptime(),
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Response = #xmlel{ns = ?NS_LAST_ACTIVITY, name = 'query', attrs =
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[?XMLATTR('seconds', Sec)]},
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exmpp_iq:result(IQ_Rec, Response);
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process_local_iq(_From, _To, #iq{type = set} = IQ_Rec) ->
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exmpp_iq:error(IQ_Rec, 'not-allowed').
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%% @spec () -> integer()
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%% @doc Get the uptime of the ejabberd node, expressed in seconds.
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%% When ejabberd is starting, ejabberd_config:start/0 stores the datetime.
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get_node_uptime() ->
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case ejabberd_config:get_local_option(node_start) of
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{_, _, _} = StartNow ->
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now_to_seconds(now()) - now_to_seconds(StartNow);
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_undefined ->
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trunc(element(1, erlang:statistics(wall_clock))/1000)
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end.
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now_to_seconds({MegaSecs, Secs, _MicroSecs}) ->
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MegaSecs * 1000000 + Secs.
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%%%
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%%% Serve queries about user last online
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%%%
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process_sm_iq(From, To, #iq{type = get} = IQ_Rec) ->
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{Subscription, _Groups} =
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ejabberd_hooks:run_fold(
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roster_get_jid_info, exmpp_jid:prep_domain(To),
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{none, []}, [exmpp_jid:prep_node(To), exmpp_jid:prep_domain(To), From]),
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if
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(Subscription == both) or (Subscription == from) ->
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UserListRecord = ejabberd_hooks:run_fold(
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privacy_get_user_list, exmpp_jid:prep_domain(To),
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#userlist{},
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[exmpp_jid:prep_node(To), exmpp_jid:prep_domain(To)]),
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case ejabberd_hooks:run_fold(
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privacy_check_packet, exmpp_jid:prep_domain(To),
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allow,
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[exmpp_jid:prep_node(To), exmpp_jid:prep_domain(To), UserListRecord,
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{From, To,
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exmpp_presence:available()},
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out]) of
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allow ->
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get_last(IQ_Rec, exmpp_jid:prep_node(To), exmpp_jid:prep_domain(To));
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deny ->
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exmpp_iq:error(IQ_Rec, 'not-allowed')
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end;
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true ->
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exmpp_iq:error(IQ_Rec, 'not-allowed')
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end;
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process_sm_iq(_From, _To, #iq{type = set} = IQ_Rec) ->
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exmpp_iq:error(IQ_Rec, 'not-allowed').
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%% TODO: This function could use get_last_info/2
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get_last(IQ_Rec, LUser, LServer) ->
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case catch mnesia:dirty_read(last_activity, {LUser, LServer}) of
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{'EXIT', _Reason} ->
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exmpp_iq:error(IQ_Rec, 'internal-server-error');
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[] ->
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exmpp_iq:error(IQ_Rec, 'service-unavailable');
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[#last_activity{timestamp = TimeStamp, status = Status}] ->
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TimeStamp2 = now_to_seconds(now()),
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Sec = TimeStamp2 - TimeStamp,
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Response = #xmlel{ns = ?NS_LAST_ACTIVITY, name = 'query',
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attrs = [?XMLATTR('seconds', Sec)],
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children = [#xmlcdata{cdata = Status}]},
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exmpp_iq:result(IQ_Rec, Response)
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end.
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on_presence_update(User, Server, _Resource, Status) ->
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TimeStamp = now_to_seconds(now()),
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store_last_info(User, Server, TimeStamp, Status).
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store_last_info(User, Server, TimeStamp, Status)
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when is_binary(User), is_binary(Server) ->
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try
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US = {User, Server},
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F = fun() ->
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mnesia:write(#last_activity{us = US,
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timestamp = TimeStamp,
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status = Status})
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end,
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mnesia:transaction(F)
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catch
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_ ->
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ok
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end.
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%% @spec (LUser::string(), LServer::string()) ->
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%% {ok, Timestamp::integer(), Status::string()} | not_found
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get_last_info(LUser, LServer) when is_list(LUser), is_list(LServer) ->
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get_last_info(list_to_binary(LUser), list_to_binary(LServer));
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get_last_info(LUser, LServer) when is_binary(LUser), is_binary(LServer) ->
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case catch mnesia:dirty_read(last_activity, {LUser, LServer}) of
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{'EXIT', _Reason} ->
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not_found;
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[] ->
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not_found;
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[#last_activity{timestamp = TimeStamp, status = Status}] ->
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{ok, TimeStamp, Status}
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end.
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remove_user(User, Server) when is_binary(User), is_binary(Server) ->
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try
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LUser = exmpp_stringprep:nodeprep(User),
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LServer = exmpp_stringprep:nameprep(Server),
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US = {LUser, LServer},
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F = fun() ->
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mnesia:delete({last_activity, US})
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end,
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mnesia:transaction(F)
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catch
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_ ->
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ok
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end.
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update_table() ->
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Fields = record_info(fields, last_activity),
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case mnesia:table_info(last_activity, attributes) of
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Fields ->
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convert_to_exmpp();
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[user, timestamp, status] ->
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?INFO_MSG("Converting last_activity table from {user, timestamp, status} format", []),
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Host = ?MYNAME,
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mnesia:transform_table(last_activity, ignore, Fields),
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F = fun() ->
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mnesia:write_lock_table(last_activity),
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mnesia:foldl(
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fun({_, U, T, S} = R, _) ->
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U1 = convert_jid_to_exmpp(U),
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mnesia:delete_object(R),
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mnesia:write(
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#last_activity{us = {U1, Host},
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timestamp = T,
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status = list_to_binary(S)})
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end, ok, last_activity)
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end,
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mnesia:transaction(F);
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[user, timestamp] ->
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?INFO_MSG("Converting last_activity table from {user, timestamp} format", []),
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Host = ?MYNAME,
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mnesia:transform_table(
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last_activity,
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fun({_, U, T}) ->
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#last_activity{us = U,
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timestamp = T,
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status = <<>>}
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end, Fields),
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F = fun() ->
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mnesia:write_lock_table(last_activity),
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mnesia:foldl(
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fun({_, U, T, S} = R, _) ->
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mnesia:delete_object(R),
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mnesia:write(
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#last_activity{us = {U, Host},
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timestamp = T,
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status = S})
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end, ok, last_activity)
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end,
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mnesia:transaction(F);
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_ ->
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?INFO_MSG("Recreating last_activity table", []),
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mnesia:transform_table(last_activity, ignore, Fields)
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end.
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convert_to_exmpp() ->
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Fun = fun() ->
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case mnesia:first(last_activity) of
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'$end_of_table' ->
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none;
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Key ->
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case mnesia:read({last_activity, Key}) of
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[#last_activity{status = Status}] when is_binary(Status) ->
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none;
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[#last_activity{}] ->
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mnesia:foldl(fun convert_to_exmpp2/2,
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done, last_activity, write)
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end
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end
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end,
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mnesia:transaction(Fun).
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convert_to_exmpp2(#last_activity{us = {U, S} = Key, status = Status} = LA,
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Acc) ->
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% Remove old entry.
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mnesia:delete({last_activity, Key}),
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% Convert "" to undefined in JIDs.
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U1 = convert_jid_to_exmpp(U),
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% Convert status.
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Status1 = list_to_binary(Status),
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% Prepare the new record.
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New_LA = LA#last_activity{us = {list_to_binary(U1), list_to_binary(S)},
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status = Status1},
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% Write the new record.
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mnesia:write(New_LA),
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Acc.
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convert_jid_to_exmpp("") -> undefined;
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convert_jid_to_exmpp(V) -> V.
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