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%%%----------------------------------------------------------------------
%%% File : mod_last_odbc.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : jabber:iq:last support (JEP-0012)
%%% Created : 24 Oct 2003 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(mod_last_odbc).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
-behaviour(gen_mod).
-export([start/2,
stop/1,
process_local_iq/3,
process_sm_iq/3,
on_presence_update/4,
store_last_info/4,
remove_user/2]).
-include("ejabberd.hrl").
-include("jlib.hrl").
start(Host, Opts) ->
IQDisc = gen_mod:get_opt(iqdisc, Opts, one_queue),
gen_iq_handler:add_iq_handler(ejabberd_local, Host, ?NS_LAST,
?MODULE, process_local_iq, IQDisc),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host, ?NS_LAST,
?MODULE, process_sm_iq, IQDisc),
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(remove_user, Host,
?MODULE, remove_user, 50),
ejabberd_hooks:delete(unset_presence_hook, Host,
?MODULE, on_presence_update, 50),
gen_iq_handler:remove_iq_handler(ejabberd_local, Host, ?NS_LAST),
gen_iq_handler:remove_iq_handler(ejabberd_sm, Host, ?NS_LAST).
process_local_iq(_From, _To, #iq{type = Type, sub_el = SubEl} = IQ) ->
case Type of
set ->
IQ#iq{type = error, sub_el = [SubEl, ?ERR_NOT_ALLOWED]};
get ->
Sec = trunc(element(1, erlang:statistics(wall_clock))/1000),
IQ#iq{type = result,
sub_el = [{xmlelement, "query",
[{"xmlns", ?NS_LAST},
{"seconds", integer_to_list(Sec)}],
[]}]}
end.
process_sm_iq(From, To, #iq{type = Type, sub_el = SubEl} = IQ) ->
case Type of
set ->
IQ#iq{type = error, sub_el = [SubEl, ?ERR_NOT_ALLOWED]};
get ->
User = To#jid.luser,
Server = To#jid.lserver,
{Subscription, _Groups} =
ejabberd_hooks:run_fold(
roster_get_jid_info, Server,
{none, []}, [User, Server, From]),
if
(Subscription == both) or (Subscription == from) ->
case catch mod_privacy:get_user_list(User, Server) of
{'EXIT', _Reason} ->
get_last(IQ, SubEl, User, Server);
List ->
case catch mod_privacy:check_packet(
User, Server, List,
{From, To,
{xmlelement, "presence", [], []}},
out) of
{'EXIT', _Reason} ->
get_last(IQ, SubEl, User, Server);
allow ->
get_last(IQ, SubEl, User, Server);
deny ->
IQ#iq{type = error,
sub_el = [SubEl, ?ERR_NOT_ALLOWED]}
end
end;
true ->
IQ#iq{type = error,
sub_el = [SubEl, ?ERR_NOT_ALLOWED]}
end
end.
get_last(IQ, SubEl, LUser, LServer) ->
Username = ejabberd_odbc:escape(LUser),
case catch ejabberd_odbc:sql_query(
LServer,
["select seconds, state from last "
"where username='", Username, "';"]) of
{'EXIT', _Reason} ->
IQ#iq{type = error, sub_el = [SubEl, ?ERR_INTERNAL_SERVER_ERROR]};
{selected, ["seconds","state"], []} ->
IQ#iq{type = error, sub_el = [SubEl, ?ERR_SERVICE_UNAVAILABLE]};
{selected, ["seconds","state"], [{STimeStamp, Status}]} ->
case catch list_to_integer(STimeStamp) of
TimeStamp when is_integer(TimeStamp) ->
{MegaSecs, Secs, _MicroSecs} = now(),
TimeStamp2 = MegaSecs * 1000000 + Secs,
Sec = TimeStamp2 - TimeStamp,
IQ#iq{type = result,
sub_el = [{xmlelement, "query",
[{"xmlns", ?NS_LAST},
{"seconds", integer_to_list(Sec)}],
[{xmlcdata, Status}]}]};
_ ->
IQ#iq{type = error,
sub_el = [SubEl, ?ERR_INTERNAL_SERVER_ERROR]}
end
end.
on_presence_update(User, Server, _Resource, Status) ->
{MegaSecs, Secs, _MicroSecs} = now(),
TimeStamp = MegaSecs * 1000000 + Secs,
store_last_info(User, Server, TimeStamp, Status).
store_last_info(User, Server, TimeStamp, Status) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
Username = ejabberd_odbc:escape(LUser),
Seconds = ejabberd_odbc:escape(integer_to_list(TimeStamp)),
State = ejabberd_odbc:escape(Status),
%% MREMOND: I think this should be turn into a non transactional behaviour
ejabberd_odbc:sql_transaction(
LServer,
[["delete from last where username='", Username, "';"],
["insert into last(username, seconds, state) "
"values ('", Username, "', '", Seconds, "', '", State, "');"]]).
remove_user(User, Server) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
Username = ejabberd_odbc:escape(LUser),
ejabberd_odbc:sql_query(LServer,
["delete from last where username='", Username, "';"]).
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