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xmpp.chapril.org-ejabberd/src/ejabberd_sm.erl

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%%%----------------------------------------------------------------------
%%% File : ejabberd_sm.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Session manager
%%% Created : 24 Nov 2002 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(ejabberd_sm).
-behaviour(ejabberd_config).
-author('alexey@process-one.net').
-behaviour(gen_server).
%% API
-export([start/0,
start_link/0,
route/2,
route/3,
process_iq/3,
open_session/5,
open_session/6,
close_session/4,
check_in_subscription/6,
bounce_offline_message/4,
disconnect_removed_user/2,
get_user_resources/2,
get_user_present_resources/2,
set_presence/7,
unset_presence/6,
close_session_unset_presence/5,
set_offline_info/5,
get_offline_info/4,
dirty_get_sessions_list/0,
dirty_get_my_sessions_list/0,
get_vh_session_list/1,
get_vh_session_number/1,
get_vh_by_backend/1,
register_iq_handler/4,
register_iq_handler/5,
unregister_iq_handler/2,
force_update_presence/1,
connected_users/0,
connected_users_number/0,
user_resources/2,
kick_user/2,
get_session_pid/3,
get_user_info/2,
get_user_info/3,
get_user_ip/3,
get_max_user_sessions/2,
get_all_pids/0,
is_existing_resource/3,
get_commands_spec/0,
c2s_handle_info/2,
make_sid/0
]).
-export([init/1, handle_call/3, handle_cast/2,
handle_info/2, terminate/2, code_change/3, opt_type/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
-include("xmpp.hrl").
-include("ejabberd_commands.hrl").
-include("ejabberd_sm.hrl").
-callback init() -> ok | {error, any()}.
-callback set_session(#session{}) -> ok.
-callback delete_session(binary(), binary(), binary(), sid()) ->
{ok, #session{}} | {error, notfound}.
-callback get_sessions() -> [#session{}].
-callback get_sessions(binary()) -> [#session{}].
-callback get_sessions(binary(), binary()) -> [#session{}].
-callback get_sessions(binary(), binary(), binary()) -> [#session{}].
-record(state, {}).
%% default value for the maximum number of user connections
-define(MAX_USER_SESSIONS, infinity).
%%====================================================================
%% API
%%====================================================================
-export_type([sid/0, info/0]).
start() ->
ChildSpec = {?MODULE, {?MODULE, start_link, []},
transient, 1000, worker, [?MODULE]},
supervisor:start_child(ejabberd_sup, ChildSpec).
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
-spec route(jid(), term()) -> ok.
%% @doc route arbitrary term to c2s process(es)
route(To, Term) ->
case catch do_route(To, Term) of
{'EXIT', Reason} ->
?ERROR_MSG("route ~p to ~p failed: ~p",
[Term, To, Reason]);
_ ->
ok
end.
-spec route(jid(), jid(), stanza()) -> ok.
route(From, To, Packet) ->
case catch do_route(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~nwhen processing: ~p",
[Reason, {From, To, Packet}]);
_ -> ok
end.
-spec open_session(sid(), binary(), binary(), binary(), prio(), info()) -> ok.
open_session(SID, User, Server, Resource, Priority, Info) ->
set_session(SID, User, Server, Resource, Priority, Info),
check_for_sessions_to_replace(User, Server, Resource),
JID = jid:make(User, Server, Resource),
ejabberd_hooks:run(sm_register_connection_hook,
JID#jid.lserver, [SID, JID, Info]).
-spec open_session(sid(), binary(), binary(), binary(), info()) -> ok.
open_session(SID, User, Server, Resource, Info) ->
open_session(SID, User, Server, Resource, undefined, Info).
-spec close_session(sid(), binary(), binary(), binary()) -> ok.
close_session(SID, User, Server, Resource) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
LResource = jid:resourceprep(Resource),
Mod = get_sm_backend(LServer),
Info = case Mod:delete_session(LUser, LServer, LResource, SID) of
{ok, #session{info = I}} -> I;
{error, notfound} -> []
end,
JID = jid:make(User, Server, Resource),
ejabberd_hooks:run(sm_remove_connection_hook,
JID#jid.lserver, [SID, JID, Info]).
-spec check_in_subscription(boolean(), binary(), binary(), jid(),
subscribe | subscribed | unsubscribe | unsubscribed,
binary()) -> boolean() | {stop, false}.
check_in_subscription(Acc, User, Server, _JID, _Type, _Reason) ->
case ejabberd_auth:is_user_exists(User, Server) of
true -> Acc;
false -> {stop, false}
end.
-spec bounce_offline_message(bounce | any(), jid(), jid(), message()) -> stop.
bounce_offline_message(bounce = Acc, From, To, Packet) ->
Lang = xmpp:get_lang(Packet),
Txt = <<"User session not found">>,
Err = xmpp:err_service_unavailable(Txt, Lang),
ejabberd_router:route_error(To, From, Packet, Err),
{stop, Acc};
bounce_offline_message(Acc, _From, _To, _Packet) ->
Acc.
-spec disconnect_removed_user(binary(), binary()) -> ok.
disconnect_removed_user(User, Server) ->
route(jid:make(User, Server, <<"">>), {exit, <<"User removed">>}).
get_user_resources(User, Server) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
Mod = get_sm_backend(LServer),
Ss = online(Mod:get_sessions(LUser, LServer)),
[element(3, S#session.usr) || S <- clean_session_list(Ss)].
-spec get_user_present_resources(binary(), binary()) -> [tuple()].
get_user_present_resources(LUser, LServer) ->
Mod = get_sm_backend(LServer),
Ss = online(Mod:get_sessions(LUser, LServer)),
[{S#session.priority, element(3, S#session.usr)}
|| S <- clean_session_list(Ss), is_integer(S#session.priority)].
-spec get_user_ip(binary(), binary(), binary()) -> ip().
get_user_ip(User, Server, Resource) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
LResource = jid:resourceprep(Resource),
Mod = get_sm_backend(LServer),
case online(Mod:get_sessions(LUser, LServer, LResource)) of
[] ->
undefined;
Ss ->
Session = lists:max(Ss),
proplists:get_value(ip, Session#session.info)
end.
-spec get_user_info(binary(), binary()) -> [{binary(), info()}].
get_user_info(User, Server) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
Mod = get_sm_backend(LServer),
Ss = online(Mod:get_sessions(LUser, LServer)),
[{LResource, [{node, node(Pid)}|Info]}
|| #session{usr = {_, _, LResource},
info = Info,
sid = {_, Pid}} <- clean_session_list(Ss)].
-spec get_user_info(binary(), binary(), binary()) -> info() | offline.
get_user_info(User, Server, Resource) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
LResource = jid:resourceprep(Resource),
Mod = get_sm_backend(LServer),
case online(Mod:get_sessions(LUser, LServer, LResource)) of
[] ->
offline;
Ss ->
Session = lists:max(Ss),
Node = node(element(2, Session#session.sid)),
[{node, Node}|Session#session.info]
end.
-spec set_presence(sid(), binary(), binary(), binary(),
prio(), presence(), info()) -> ok.
set_presence(SID, User, Server, Resource, Priority,
Presence, Info) ->
set_session(SID, User, Server, Resource, Priority,
Info),
ejabberd_hooks:run(set_presence_hook,
jid:nameprep(Server),
[User, Server, Resource, Presence]).
-spec unset_presence(sid(), binary(), binary(),
binary(), binary(), info()) -> ok.
unset_presence(SID, User, Server, Resource, Status,
Info) ->
set_session(SID, User, Server, Resource, undefined,
Info),
ejabberd_hooks:run(unset_presence_hook,
jid:nameprep(Server),
[User, Server, Resource, Status]).
-spec close_session_unset_presence(sid(), binary(), binary(),
binary(), binary()) -> ok.
close_session_unset_presence(SID, User, Server,
Resource, Status) ->
close_session(SID, User, Server, Resource),
ejabberd_hooks:run(unset_presence_hook,
jid:nameprep(Server),
[User, Server, Resource, Status]).
-spec get_session_pid(binary(), binary(), binary()) -> none | pid().
get_session_pid(User, Server, Resource) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
LResource = jid:resourceprep(Resource),
Mod = get_sm_backend(LServer),
case online(Mod:get_sessions(LUser, LServer, LResource)) of
[#session{sid = {_, Pid}}] -> Pid;
_ -> none
end.
-spec set_offline_info(sid(), binary(), binary(), binary(), info()) -> ok.
set_offline_info(SID, User, Server, Resource, Info) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
LResource = jid:resourceprep(Resource),
set_session(SID, LUser, LServer, LResource, undefined, [offline | Info]).
-spec get_offline_info(erlang:timestamp(), binary(), binary(),
binary()) -> none | info().
get_offline_info(Time, User, Server, Resource) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
LResource = jid:resourceprep(Resource),
Mod = get_sm_backend(LServer),
case Mod:get_sessions(LUser, LServer, LResource) of
[#session{sid = {Time, _}, info = Info}] ->
case proplists:get_bool(offline, Info) of
true ->
Info;
false ->
none
end;
_ ->
none
end.
-spec dirty_get_sessions_list() -> [ljid()].
dirty_get_sessions_list() ->
lists:flatmap(
fun(Mod) ->
[S#session.usr || S <- online(Mod:get_sessions())]
end, get_sm_backends()).
-spec dirty_get_my_sessions_list() -> [#session{}].
dirty_get_my_sessions_list() ->
lists:flatmap(
fun(Mod) ->
[S || S <- online(Mod:get_sessions()),
node(element(2, S#session.sid)) == node()]
end, get_sm_backends()).
-spec get_vh_session_list(binary()) -> [ljid()].
get_vh_session_list(Server) ->
LServer = jid:nameprep(Server),
Mod = get_sm_backend(LServer),
[S#session.usr || S <- online(Mod:get_sessions(LServer))].
-spec get_all_pids() -> [pid()].
get_all_pids() ->
lists:flatmap(
fun(Mod) ->
[element(2, S#session.sid) || S <- online(Mod:get_sessions())]
end, get_sm_backends()).
-spec get_vh_session_number(binary()) -> non_neg_integer().
get_vh_session_number(Server) ->
LServer = jid:nameprep(Server),
Mod = get_sm_backend(LServer),
length(online(Mod:get_sessions(LServer))).
register_iq_handler(Host, XMLNS, Module, Fun) ->
ejabberd_sm ! {register_iq_handler, Host, XMLNS, Module, Fun}.
-spec register_iq_handler(binary(), binary(), atom(), atom(), list()) -> any().
register_iq_handler(Host, XMLNS, Module, Fun, Opts) ->
ejabberd_sm ! {register_iq_handler, Host, XMLNS, Module, Fun, Opts}.
-spec unregister_iq_handler(binary(), binary()) -> any().
unregister_iq_handler(Host, XMLNS) ->
ejabberd_sm ! {unregister_iq_handler, Host, XMLNS}.
%% Why the hell do we have so many similar kicks?
c2s_handle_info(#{lang := Lang} = State, replaced) ->
State1 = State#{replaced => true},
Err = xmpp:serr_conflict(<<"Replaced by new connection">>, Lang),
{stop, ejabberd_c2s:send(State1, Err)};
c2s_handle_info(#{lang := Lang} = State, kick) ->
Err = xmpp:serr_policy_violation(<<"has been kicked">>, Lang),
c2s_handle_info(State, {kick, kicked_by_admin, Err});
c2s_handle_info(State, {kick, _Reason, Err}) ->
{stop, ejabberd_c2s:send(State, Err)};
c2s_handle_info(#{lang := Lang} = State, {exit, Reason}) ->
Err = xmpp:serr_conflict(Reason, Lang),
{stop, ejabberd_c2s:send(State, Err)};
c2s_handle_info(State, _) ->
State.
%%====================================================================
%% gen_server callbacks
%%====================================================================
init([]) ->
lists:foreach(fun(Mod) -> Mod:init() end, get_sm_backends()),
ets:new(sm_iqtable, [named_table, public]),
lists:foreach(
fun(Host) ->
ejabberd_hooks:add(c2s_handle_info, Host,
ejabberd_sm, c2s_handle_info, 50),
ejabberd_hooks:add(roster_in_subscription, Host,
ejabberd_sm, check_in_subscription, 20),
ejabberd_hooks:add(offline_message_hook, Host,
ejabberd_sm, bounce_offline_message, 100),
ejabberd_hooks:add(remove_user, Host,
ejabberd_sm, disconnect_removed_user, 100),
ejabberd_c2s:add_hooks(Host)
end, ?MYHOSTS),
ejabberd_commands:register_commands(get_commands_spec()),
{ok, #state{}}.
handle_call(_Request, _From, State) ->
Reply = ok, {reply, Reply, State}.
handle_cast(_Msg, State) -> {noreply, State}.
handle_info({route, From, To, Packet}, State) ->
case catch do_route(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~nwhen processing: ~p",
[Reason, {From, To, Packet}]);
_ ->
ok
end,
{noreply, State};
handle_info({register_iq_handler, Host, XMLNS, Module, Function}, State) ->
ets:insert(sm_iqtable, {{Host, XMLNS}, Module, Function}),
{noreply, State};
handle_info({register_iq_handler, Host, XMLNS, Module,
Function, Opts},
State) ->
ets:insert(sm_iqtable,
{{Host, XMLNS}, Module, Function, Opts}),
{noreply, State};
handle_info({unregister_iq_handler, Host, XMLNS},
State) ->
case ets:lookup(sm_iqtable, {Host, XMLNS}) of
[{_, Module, Function, Opts}] ->
gen_iq_handler:stop_iq_handler(Module, Function, Opts);
_ -> ok
end,
ets:delete(sm_iqtable, {Host, XMLNS}),
{noreply, State};
handle_info(_Info, State) -> {noreply, State}.
terminate(_Reason, _State) ->
lists:foreach(
fun(Host) ->
ejabberd_hooks:delete(c2s_handle_info, Host,
ejabberd_sm, c2s_handle_info, 50),
ejabberd_hooks:delete(roster_in_subscription, Host,
ejabberd_sm, check_in_subscription, 20),
ejabberd_hooks:delete(offline_message_hook, Host,
ejabberd_sm, bounce_offline_message, 100),
ejabberd_hooks:delete(remove_user, Host,
ejabberd_sm, disconnect_removed_user, 100)
end, ?MYHOSTS),
ejabberd_commands:unregister_commands(get_commands_spec()),
ok.
code_change(_OldVsn, State, _Extra) -> {ok, State}.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
-spec set_session(sid(), binary(), binary(), binary(),
prio(), info()) -> ok.
set_session(SID, User, Server, Resource, Priority, Info) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
LResource = jid:resourceprep(Resource),
US = {LUser, LServer},
USR = {LUser, LServer, LResource},
Mod = get_sm_backend(LServer),
Mod:set_session(#session{sid = SID, usr = USR, us = US,
priority = Priority, info = Info}).
-spec online([#session{}]) -> [#session{}].
online(Sessions) ->
lists:filter(fun is_online/1, Sessions).
-spec is_online(#session{}) -> boolean().
is_online(#session{info = Info}) ->
not proplists:get_bool(offline, Info).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec do_route(jid(), term()) -> any().
do_route(#jid{lresource = <<"">>} = To, Term) ->
lists:foreach(
fun(R) ->
do_route(jid:replace_resource(To, R), Term)
end, get_user_resources(To#jid.user, To#jid.server));
do_route(To, Term) ->
?DEBUG("broadcasting ~p to ~s", [Term, jid:to_string(To)]),
{U, S, R} = jid:tolower(To),
Mod = get_sm_backend(S),
case online(Mod:get_sessions(U, S, R)) of
[] ->
?DEBUG("dropping broadcast to unavailable resourse: ~p", [Term]);
Ss ->
Session = lists:max(Ss),
Pid = element(2, Session#session.sid),
?DEBUG("sending to process ~p: ~p", [Pid, Term]),
Pid ! Term
end.
-spec do_route(jid(), jid(), stanza()) -> any().
do_route(From, To, #presence{type = T, status = Status} = Packet)
when T == subscribe; T == subscribed; T == unsubscribe; T == unsubscribed ->
?DEBUG("processing subscription:~n~s", [xmpp:pp(Packet)]),
#jid{user = User, server = Server,
luser = LUser, lserver = LServer} = To,
Reason = if T == subscribe -> xmpp:get_text(Status);
true -> <<"">>
end,
case is_privacy_allow(From, To, Packet) andalso
ejabberd_hooks:run_fold(
roster_in_subscription,
LServer, false,
[User, Server, From, T, Reason]) of
true ->
Mod = get_sm_backend(LServer),
lists:foreach(
fun(#session{sid = SID, usr = {_, _, R},
priority = Prio}) when is_integer(Prio) ->
Pid = element(2, SID),
?DEBUG("sending to process ~p:~n~s",
[Pid, xmpp:pp(Packet)]),
Pid ! {route, From, jid:replace_resource(To, R), Packet};
(_) ->
ok
end, online(Mod:get_sessions(LUser, LServer)));
false ->
ok
end;
do_route(From, #jid{lresource = <<"">>} = To, #presence{} = Packet) ->
?DEBUG("processing presence to bare JID:~n~s", [xmpp:pp(Packet)]),
{LUser, LServer, _} = jid:tolower(To),
lists:foreach(
fun({_, R}) ->
do_route(From, jid:replace_resource(To, R), Packet)
end, get_user_present_resources(LUser, LServer));
do_route(From, #jid{lresource = <<"">>} = To, #message{type = T} = Packet) ->
?DEBUG("processing message to bare JID:~n~s", [xmpp:pp(Packet)]),
if T == chat; T == headline; T == normal; T == groupchat ->
route_message(From, To, Packet, T);
true ->
Lang = xmpp:get_lang(Packet),
ErrTxt = <<"User session not found">>,
Err = xmpp:err_service_unavailable(ErrTxt, Lang),
ejabberd_router:route_error(To, From, Packet, Err)
end;
do_route(From, #jid{lresource = <<"">>} = To, #iq{} = Packet) ->
?DEBUG("processing IQ to bare JID:~n~s", [xmpp:pp(Packet)]),
process_iq(From, To, Packet);
do_route(From, To, Packet) ->
?DEBUG("processing packet to full JID:~n~s", [xmpp:pp(Packet)]),
{LUser, LServer, LResource} = jid:tolower(To),
Mod = get_sm_backend(LServer),
case online(Mod:get_sessions(LUser, LServer, LResource)) of
[] ->
case Packet of
#message{type = T} when T == chat; T == normal;
T == headline; T == groupchat ->
route_message(From, To, Packet, T);
#presence{} ->
?DEBUG("dropping presence to unavalable resource:~n~s",
[xmpp:pp(Packet)]);
_ ->
Lang = xmpp:get_lang(Packet),
ErrTxt = <<"User session not found">>,
Err = xmpp:err_service_unavailable(ErrTxt, Lang),
ejabberd_router:route_error(To, From, Packet, Err)
end;
Ss ->
Session = lists:max(Ss),
Pid = element(2, Session#session.sid),
?DEBUG("sending to process ~p:~n~s", [Pid, xmpp:pp(Packet)]),
Pid ! {route, From, To, Packet}
end.
%% The default list applies to the user as a whole,
%% and is processed if there is no active list set
%% for the target session/resource to which a stanza is addressed,
%% or if there are no current sessions for the user.
-spec is_privacy_allow(jid(), jid(), stanza()) -> boolean().
is_privacy_allow(From, To, Packet) ->
LServer = To#jid.server,
allow == ejabberd_hooks:run_fold(
privacy_check_packet, LServer, allow,
[To, xmpp:set_from_to(Packet, From, To), in]).
-spec route_message(jid(), jid(), message(), message_type()) -> any().
route_message(From, To, Packet, Type) ->
LUser = To#jid.luser,
LServer = To#jid.lserver,
PrioRes = get_user_present_resources(LUser, LServer),
case catch lists:max(PrioRes) of
{MaxPrio, MaxRes}
when is_integer(MaxPrio), MaxPrio >= 0 ->
lists:foreach(fun ({P, R}) when P == MaxPrio;
(P >= 0) and (Type == headline) ->
LResource = jid:resourceprep(R),
Mod = get_sm_backend(LServer),
case online(Mod:get_sessions(LUser, LServer,
LResource)) of
[] ->
ok; % Race condition
Ss ->
Session = lists:max(Ss),
Pid = element(2, Session#session.sid),
?DEBUG("sending to process ~p~n", [Pid]),
LMaxRes = jid:resourceprep(MaxRes),
Packet1 = maybe_mark_as_copy(Packet,
LResource,
LMaxRes,
P, MaxPrio),
Pid ! {route, From, To, Packet1}
end;
%% Ignore other priority:
({_Prio, _Res}) -> ok
end,
PrioRes);
_ ->
case ejabberd_auth:is_user_exists(LUser, LServer) andalso
is_privacy_allow(From, To, Packet) of
true ->
ejabberd_hooks:run_fold(offline_message_hook,
LServer, bounce,
[From, To, Packet]);
false ->
Err = xmpp:err_service_unavailable(),
ejabberd_router:route_error(To, From, Packet, Err)
end
end.
-spec maybe_mark_as_copy(message(), binary(), binary(), integer(), integer())
-> message().
maybe_mark_as_copy(Packet, R, R, P, P) ->
Packet;
maybe_mark_as_copy(Packet, _, _, P, P) ->
xmpp:put_meta(Packet, sm_copy, true);
maybe_mark_as_copy(Packet, _, _, _, _) ->
Packet.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec clean_session_list([#session{}]) -> [#session{}].
clean_session_list(Ss) ->
clean_session_list(lists:keysort(#session.usr, Ss), []).
-spec clean_session_list([#session{}], [#session{}]) -> [#session{}].
clean_session_list([], Res) -> Res;
clean_session_list([S], Res) -> [S | Res];
clean_session_list([S1, S2 | Rest], Res) ->
if S1#session.usr == S2#session.usr ->
if S1#session.sid > S2#session.sid ->
clean_session_list([S1 | Rest], Res);
true -> clean_session_list([S2 | Rest], Res)
end;
true -> clean_session_list([S2 | Rest], [S1 | Res])
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% On new session, check if some existing connections need to be replace
-spec check_for_sessions_to_replace(binary(), binary(), binary()) -> ok | replaced.
check_for_sessions_to_replace(User, Server, Resource) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
LResource = jid:resourceprep(Resource),
check_existing_resources(LUser, LServer, LResource),
check_max_sessions(LUser, LServer).
-spec check_existing_resources(binary(), binary(), binary()) -> ok.
check_existing_resources(LUser, LServer, LResource) ->
Mod = get_sm_backend(LServer),
Ss = Mod:get_sessions(LUser, LServer, LResource),
{OnlineSs, OfflineSs} = lists:partition(fun is_online/1, Ss),
lists:foreach(fun(#session{sid = S}) ->
Mod:delete_session(LUser, LServer, LResource, S)
end, OfflineSs),
if OnlineSs == [] -> ok;
true ->
SIDs = [SID || #session{sid = SID} <- OnlineSs],
MaxSID = lists:max(SIDs),
lists:foreach(fun ({_, Pid} = S) when S /= MaxSID ->
Pid ! replaced;
(_) -> ok
end,
SIDs)
end.
-spec is_existing_resource(binary(), binary(), binary()) -> boolean().
is_existing_resource(LUser, LServer, LResource) ->
[] /= get_resource_sessions(LUser, LServer, LResource).
-spec get_resource_sessions(binary(), binary(), binary()) -> [sid()].
get_resource_sessions(User, Server, Resource) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
LResource = jid:resourceprep(Resource),
Mod = get_sm_backend(LServer),
[S#session.sid || S <- online(Mod:get_sessions(LUser, LServer, LResource))].
-spec check_max_sessions(binary(), binary()) -> ok | replaced.
check_max_sessions(LUser, LServer) ->
Mod = get_sm_backend(LServer),
Ss = Mod:get_sessions(LUser, LServer),
{OnlineSs, OfflineSs} = lists:partition(fun is_online/1, Ss),
MaxSessions = get_max_user_sessions(LUser, LServer),
if length(OnlineSs) =< MaxSessions -> ok;
true ->
#session{sid = {_, Pid}} = lists:min(OnlineSs),
Pid ! replaced
end,
if length(OfflineSs) =< MaxSessions -> ok;
true ->
#session{sid = SID, usr = {_, _, R}} = lists:min(OfflineSs),
Mod:delete_session(LUser, LServer, R, SID)
end.
%% Get the user_max_session setting
%% This option defines the max number of time a given users are allowed to
%% log in
%% Defaults to infinity
-spec get_max_user_sessions(binary(), binary()) -> infinity | non_neg_integer().
get_max_user_sessions(LUser, Host) ->
case acl:match_rule(Host, max_user_sessions,
jid:make(LUser, Host, <<"">>))
of
Max when is_integer(Max) -> Max;
infinity -> infinity;
_ -> ?MAX_USER_SESSIONS
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec process_iq(jid(), jid(), iq()) -> any().
process_iq(From, To, #iq{type = T, lang = Lang, sub_els = [El]} = Packet)
when T == get; T == set ->
XMLNS = xmpp:get_ns(El),
Host = To#jid.lserver,
case ets:lookup(sm_iqtable, {Host, XMLNS}) of
[{_, Module, Function}] ->
gen_iq_handler:handle(Host, Module, Function, no_queue,
From, To, Packet);
[{_, Module, Function, Opts}] ->
gen_iq_handler:handle(Host, Module, Function, Opts,
From, To, Packet);
[] ->
Txt = <<"No module is handling this query">>,
Err = xmpp:err_service_unavailable(Txt, Lang),
ejabberd_router:route_error(To, From, Packet, Err)
end;
process_iq(From, To, #iq{type = T, lang = Lang, sub_els = SubEls} = Packet)
when T == get; T == set ->
Txt = case SubEls of
[] -> <<"No child elements found">>;
_ -> <<"Too many child elements">>
end,
Err = xmpp:err_bad_request(Txt, Lang),
ejabberd_router:route_error(To, From, Packet, Err);
process_iq(_From, _To, #iq{}) ->
ok.
-spec force_update_presence({binary(), binary()}) -> ok.
force_update_presence({LUser, LServer}) ->
Mod = get_sm_backend(LServer),
Ss = online(Mod:get_sessions(LUser, LServer)),
lists:foreach(fun (#session{sid = {_, Pid}}) ->
Pid ! force_update_presence
end,
Ss).
-spec get_sm_backend(binary()) -> module().
get_sm_backend(Host) ->
DBType = case ejabberd_config:get_option(
{sm_db_type, Host},
fun(T) -> ejabberd_config:v_db(?MODULE, T) end) of
undefined ->
ejabberd_config:default_ram_db(Host, ?MODULE);
T ->
T
end,
list_to_atom("ejabberd_sm_" ++ atom_to_list(DBType)).
-spec get_sm_backends() -> [module()].
get_sm_backends() ->
lists:usort([get_sm_backend(Host) || Host <- ?MYHOSTS]).
-spec get_vh_by_backend(module()) -> [binary()].
get_vh_by_backend(Mod) ->
lists:filter(
fun(Host) ->
get_sm_backend(Host) == Mod
end, ?MYHOSTS).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% ejabberd commands
get_commands_spec() ->
[#ejabberd_commands{name = connected_users,
tags = [session],
desc = "List all established sessions",
policy = admin,
module = ?MODULE, function = connected_users, args = [],
result = {connected_users, {list, {sessions, string}}}},
#ejabberd_commands{name = connected_users_number,
tags = [session, stats],
desc = "Get the number of established sessions",
policy = admin,
module = ?MODULE, function = connected_users_number,
args = [], result = {num_sessions, integer}},
#ejabberd_commands{name = user_resources,
tags = [session],
desc = "List user's connected resources",
policy = user,
module = ?MODULE, function = user_resources,
args = [],
result = {resources, {list, {resource, string}}}},
#ejabberd_commands{name = kick_user,
tags = [session],
desc = "Disconnect user's active sessions",
module = ?MODULE, function = kick_user,
args = [{user, binary}, {host, binary}],
result = {num_resources, integer}}].
-spec connected_users() -> [binary()].
connected_users() ->
USRs = dirty_get_sessions_list(),
SUSRs = lists:sort(USRs),
lists:map(fun ({U, S, R}) -> <<U/binary, $@, S/binary, $/, R/binary>> end,
SUSRs).
connected_users_number() ->
length(dirty_get_sessions_list()).
user_resources(User, Server) ->
Resources = get_user_resources(User, Server),
lists:sort(Resources).
kick_user(User, Server) ->
Resources = get_user_resources(User, Server),
lists:foreach(
fun(Resource) ->
PID = get_session_pid(User, Server, Resource),
PID ! kick
end, Resources),
length(Resources).
make_sid() ->
{p1_time_compat:unique_timestamp(), self()}.
opt_type(sm_db_type) -> fun(T) -> ejabberd_config:v_db(?MODULE, T) end;
opt_type(_) -> [sm_db_type].
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