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

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%%%----------------------------------------------------------------------
%%% File : mod_offline.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Store and manage offline messages in Mnesia database.
%%% Created : 5 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2010 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., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(mod_offline).
-author('alexey@process-one.net').
-behaviour(gen_mod).
-export([start/2,
loop/1,
stop/1,
store_packet/3,
resend_offline_messages/2,
pop_offline_messages/3,
get_sm_features/5,
remove_expired_messages/0,
remove_old_messages/1,
remove_user/2,
get_queue_length/2,
webadmin_page/3,
webadmin_user/4,
webadmin_user_parse_query/5]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-include("web/ejabberd_http.hrl").
-include("web/ejabberd_web_admin.hrl").
-record(offline_msg, {us, timestamp, expire, from, to, packet}).
-define(PROCNAME, ejabberd_offline).
-define(OFFLINE_TABLE_LOCK_THRESHOLD, 1000).
%% default value for the maximum number of user messages
-define(MAX_USER_MESSAGES, infinity).
start(Host, Opts) ->
mnesia:create_table(offline_msg,
[{disc_only_copies, [node()]},
{type, bag},
{attributes, record_info(fields, offline_msg)}]),
update_table(),
ejabberd_hooks:add(offline_message_hook, Host,
?MODULE, store_packet, 50),
ejabberd_hooks:add(resend_offline_messages_hook, Host,
?MODULE, pop_offline_messages, 50),
ejabberd_hooks:add(remove_user, Host,
?MODULE, remove_user, 50),
ejabberd_hooks:add(anonymous_purge_hook, Host,
?MODULE, remove_user, 50),
ejabberd_hooks:add(disco_sm_features, Host,
?MODULE, get_sm_features, 50),
ejabberd_hooks:add(disco_local_features, Host,
?MODULE, get_sm_features, 50),
ejabberd_hooks:add(webadmin_page_host, Host,
?MODULE, webadmin_page, 50),
ejabberd_hooks:add(webadmin_user, Host,
?MODULE, webadmin_user, 50),
ejabberd_hooks:add(webadmin_user_parse_query, Host,
?MODULE, webadmin_user_parse_query, 50),
AccessMaxOfflineMsgs = gen_mod:get_opt(access_max_user_messages, Opts, max_user_offline_messages),
register(gen_mod:get_module_proc(Host, ?PROCNAME),
spawn(?MODULE, loop, [AccessMaxOfflineMsgs])).
loop(AccessMaxOfflineMsgs) ->
receive
#offline_msg{us=US} = Msg ->
Msgs = receive_all(US, [Msg]),
Len = length(Msgs),
{User, Host} = US,
MaxOfflineMsgs = get_max_user_messages(AccessMaxOfflineMsgs,
User, Host),
F = fun() ->
%% Only count messages if needed:
Count = if MaxOfflineMsgs =/= infinity ->
Len + p1_mnesia:count_records(
offline_msg,
#offline_msg{us=US, _='_'});
true ->
0
end,
if
Count > MaxOfflineMsgs ->
discard_warn_sender(Msgs);
true ->
if
Len >= ?OFFLINE_TABLE_LOCK_THRESHOLD ->
mnesia:write_lock_table(offline_msg);
true ->
ok
end,
lists:foreach(fun(M) ->
mnesia:write(M)
end, Msgs)
end
end,
mnesia:transaction(F),
loop(AccessMaxOfflineMsgs);
_ ->
loop(AccessMaxOfflineMsgs)
end.
%% Function copied from ejabberd_sm.erl:
get_max_user_messages(AccessRule, LUser, Host) ->
case acl:match_rule(
Host, AccessRule, jlib:make_jid(LUser, Host, "")) of
Max when is_integer(Max) -> Max;
infinity -> infinity;
_ -> ?MAX_USER_MESSAGES
end.
receive_all(US, Msgs) ->
receive
#offline_msg{us=US} = Msg ->
receive_all(US, [Msg | Msgs])
after 0 ->
Msgs
end.
stop(Host) ->
ejabberd_hooks:delete(offline_message_hook, Host,
?MODULE, store_packet, 50),
ejabberd_hooks:delete(resend_offline_messages_hook, Host,
?MODULE, pop_offline_messages, 50),
ejabberd_hooks:delete(remove_user, Host,
?MODULE, remove_user, 50),
ejabberd_hooks:delete(anonymous_purge_hook, Host,
?MODULE, remove_user, 50),
ejabberd_hooks:delete(disco_sm_features, Host, ?MODULE, get_sm_features, 50),
ejabberd_hooks:delete(disco_local_features, Host, ?MODULE, get_sm_features, 50),
ejabberd_hooks:delete(webadmin_page_host, Host,
?MODULE, webadmin_page, 50),
ejabberd_hooks:delete(webadmin_user, Host,
?MODULE, webadmin_user, 50),
ejabberd_hooks:delete(webadmin_user_parse_query, Host,
?MODULE, webadmin_user_parse_query, 50),
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
exit(whereis(Proc), stop),
{wait, Proc}.
get_sm_features(Acc, _From, _To, "", _Lang) ->
Feats = case Acc of
{result, I} -> I;
_ -> []
end,
{result, Feats ++ [?NS_FEATURE_MSGOFFLINE]};
get_sm_features(_Acc, _From, _To, ?NS_FEATURE_MSGOFFLINE, _Lang) ->
%% override all lesser features...
{result, []};
get_sm_features(Acc, _From, _To, _Node, _Lang) ->
Acc.
store_packet(From, To, Packet) ->
Type = xml:get_tag_attr_s("type", Packet),
if
(Type /= "error") and (Type /= "groupchat") and
(Type /= "headline") ->
case check_event_chatstates(From, To, Packet) of
true ->
#jid{luser = LUser, lserver = LServer} = To,
TimeStamp = now(),
{xmlelement, _Name, _Attrs, Els} = Packet,
Expire = find_x_expire(TimeStamp, Els),
gen_mod:get_module_proc(To#jid.lserver, ?PROCNAME) !
#offline_msg{us = {LUser, LServer},
timestamp = TimeStamp,
expire = Expire,
from = From,
to = To,
packet = Packet},
stop;
_ ->
ok
end;
true ->
ok
end.
%% Check if the packet has any content about XEP-0022 or XEP-0085
check_event_chatstates(From, To, Packet) ->
{xmlelement, Name, Attrs, Els} = Packet,
case find_x_event_chatstates(Els, {false, false, false}) of
%% There wasn't any x:event or chatstates subelements
{false, false, _} ->
true;
%% There a chatstates subelement and other stuff, but no x:event
{false, CEl, true} when CEl /= false ->
true;
%% There was only a subelement: a chatstates
{false, CEl, false} when CEl /= false ->
%% Don't allow offline storage
false;
%% There was an x:event element, and maybe also other stuff
{El, _, _} when El /= false ->
case xml:get_subtag(El, "id") of
false ->
case xml:get_subtag(El, "offline") of
false ->
true;
_ ->
ID = case xml:get_tag_attr_s("id", Packet) of
"" ->
{xmlelement, "id", [], []};
S ->
{xmlelement, "id", [],
[{xmlcdata, S}]}
end,
ejabberd_router:route(
To, From, {xmlelement, Name, Attrs,
[{xmlelement, "x",
[{"xmlns", ?NS_EVENT}],
[ID,
{xmlelement, "offline", [], []}]}]
}),
true
end;
_ ->
false
end
end.
%% Check if the packet has subelements about XEP-0022, XEP-0085 or other
find_x_event_chatstates([], Res) ->
Res;
find_x_event_chatstates([{xmlcdata, _} | Els], Res) ->
find_x_event_chatstates(Els, Res);
find_x_event_chatstates([El | Els], {A, B, C}) ->
case xml:get_tag_attr_s("xmlns", El) of
?NS_EVENT ->
find_x_event_chatstates(Els, {El, B, C});
?NS_CHATSTATES ->
find_x_event_chatstates(Els, {A, El, C});
_ ->
find_x_event_chatstates(Els, {A, B, true})
end.
find_x_expire(_, []) ->
never;
find_x_expire(TimeStamp, [{xmlcdata, _} | Els]) ->
find_x_expire(TimeStamp, Els);
find_x_expire(TimeStamp, [El | Els]) ->
case xml:get_tag_attr_s("xmlns", El) of
?NS_EXPIRE ->
Val = xml:get_tag_attr_s("seconds", El),
case catch list_to_integer(Val) of
{'EXIT', _} ->
never;
Int when Int > 0 ->
{MegaSecs, Secs, MicroSecs} = TimeStamp,
S = MegaSecs * 1000000 + Secs + Int,
MegaSecs1 = S div 1000000,
Secs1 = S rem 1000000,
{MegaSecs1, Secs1, MicroSecs};
_ ->
never
end;
_ ->
find_x_expire(TimeStamp, Els)
end.
resend_offline_messages(User, Server) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
F = fun() ->
Rs = mnesia:wread({offline_msg, US}),
mnesia:delete({offline_msg, US}),
Rs
end,
case mnesia:transaction(F) of
{atomic, Rs} ->
lists:foreach(
fun(R) ->
{xmlelement, Name, Attrs, Els} = R#offline_msg.packet,
ejabberd_sm !
{route,
R#offline_msg.from,
R#offline_msg.to,
{xmlelement, Name, Attrs,
Els ++
[jlib:timestamp_to_xml(
calendar:now_to_universal_time(
R#offline_msg.timestamp),
utc,
jlib:make_jid("", Server, ""),
"Offline Storage"),
%% TODO: Delete the next three lines once XEP-0091 is Obsolete
jlib:timestamp_to_xml(
calendar:now_to_universal_time(
R#offline_msg.timestamp))]}}
end,
lists:keysort(#offline_msg.timestamp, Rs));
_ ->
ok
end.
pop_offline_messages(Ls, User, Server) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
F = fun() ->
Rs = mnesia:wread({offline_msg, US}),
mnesia:delete({offline_msg, US}),
Rs
end,
case mnesia:transaction(F) of
{atomic, Rs} ->
TS = now(),
Ls ++ lists:map(
fun(R) ->
{xmlelement, Name, Attrs, Els} = R#offline_msg.packet,
{route,
R#offline_msg.from,
R#offline_msg.to,
{xmlelement, Name, Attrs,
Els ++
[jlib:timestamp_to_xml(
calendar:now_to_universal_time(
R#offline_msg.timestamp),
utc,
jlib:make_jid("", Server, ""),
"Offline Storage"),
%% TODO: Delete the next three lines once XEP-0091 is Obsolete
jlib:timestamp_to_xml(
calendar:now_to_universal_time(
R#offline_msg.timestamp))]}}
end,
lists:filter(
fun(R) ->
case R#offline_msg.expire of
never ->
true;
TimeStamp ->
TS < TimeStamp
end
end,
lists:keysort(#offline_msg.timestamp, Rs)));
_ ->
Ls
end.
remove_expired_messages() ->
TimeStamp = now(),
F = fun() ->
mnesia:write_lock_table(offline_msg),
mnesia:foldl(
fun(Rec, _Acc) ->
case Rec#offline_msg.expire of
never ->
ok;
TS ->
if
TS < TimeStamp ->
mnesia:delete_object(Rec);
true ->
ok
end
end
end, ok, offline_msg)
end,
mnesia:transaction(F).
remove_old_messages(Days) ->
{MegaSecs, Secs, _MicroSecs} = now(),
S = MegaSecs * 1000000 + Secs - 60 * 60 * 24 * Days,
MegaSecs1 = S div 1000000,
Secs1 = S rem 1000000,
TimeStamp = {MegaSecs1, Secs1, 0},
F = fun() ->
mnesia:write_lock_table(offline_msg),
mnesia:foldl(
fun(#offline_msg{timestamp = TS} = Rec, _Acc)
when TS < TimeStamp ->
mnesia:delete_object(Rec);
(_Rec, _Acc) -> ok
end, ok, offline_msg)
end,
mnesia:transaction(F).
remove_user(User, Server) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
F = fun() ->
mnesia:delete({offline_msg, US})
end,
mnesia:transaction(F).
update_table() ->
Fields = record_info(fields, offline_msg),
case mnesia:table_info(offline_msg, attributes) of
Fields ->
ok;
[user, timestamp, expire, from, to, packet] ->
?INFO_MSG("Converting offline_msg table from "
"{user, timestamp, expire, from, to, packet} format", []),
Host = ?MYNAME,
{atomic, ok} = mnesia:create_table(
mod_offline_tmp_table,
[{disc_only_copies, [node()]},
{type, bag},
{local_content, true},
{record_name, offline_msg},
{attributes, record_info(fields, offline_msg)}]),
mnesia:transform_table(offline_msg, ignore, Fields),
F1 = fun() ->
mnesia:write_lock_table(mod_offline_tmp_table),
mnesia:foldl(
fun(#offline_msg{us = U} = R, _) ->
mnesia:dirty_write(
mod_offline_tmp_table,
R#offline_msg{us = {U, Host}})
end, ok, offline_msg)
end,
mnesia:transaction(F1),
mnesia:clear_table(offline_msg),
F2 = fun() ->
mnesia:write_lock_table(offline_msg),
mnesia:foldl(
fun(R, _) ->
mnesia:dirty_write(R)
end, ok, mod_offline_tmp_table)
end,
mnesia:transaction(F2),
mnesia:delete_table(mod_offline_tmp_table);
[user, timestamp, from, to, packet] ->
?INFO_MSG("Converting offline_msg table from "
"{user, timestamp, from, to, packet} format", []),
Host = ?MYNAME,
{atomic, ok} = mnesia:create_table(
mod_offline_tmp_table,
[{disc_only_copies, [node()]},
{type, bag},
{local_content, true},
{record_name, offline_msg},
{attributes, record_info(fields, offline_msg)}]),
mnesia:transform_table(
offline_msg,
fun({_, U, TS, F, T, P}) ->
{xmlelement, _Name, _Attrs, Els} = P,
Expire = find_x_expire(TS, Els),
#offline_msg{us = U,
timestamp = TS,
expire = Expire,
from = F,
to = T,
packet = P}
end, Fields),
F1 = fun() ->
mnesia:write_lock_table(mod_offline_tmp_table),
mnesia:foldl(
fun(#offline_msg{us = U} = R, _) ->
mnesia:dirty_write(
mod_offline_tmp_table,
R#offline_msg{us = {U, Host}})
end, ok, offline_msg)
end,
mnesia:transaction(F1),
mnesia:clear_table(offline_msg),
F2 = fun() ->
mnesia:write_lock_table(offline_msg),
mnesia:foldl(
fun(R, _) ->
mnesia:dirty_write(R)
end, ok, mod_offline_tmp_table)
end,
mnesia:transaction(F2),
mnesia:delete_table(mod_offline_tmp_table);
_ ->
?INFO_MSG("Recreating offline_msg table", []),
mnesia:transform_table(offline_msg, ignore, Fields)
end.
%% Helper functions:
%% Warn senders that their messages have been discarded:
discard_warn_sender(Msgs) ->
lists:foreach(
fun(#offline_msg{from=From, to=To, packet=Packet}) ->
ErrText = "Your contact offline message queue is full. The message has been discarded.",
Lang = xml:get_tag_attr_s("xml:lang", Packet),
Err = jlib:make_error_reply(
Packet, ?ERRT_RESOURCE_CONSTRAINT(Lang, ErrText)),
ejabberd_router:route(
To,
From, Err)
end, Msgs).
webadmin_page(_, Host,
#request{us = _US,
path = ["user", U, "queue"],
q = Query,
lang = Lang} = _Request) ->
Res = user_queue(U, Host, Query, Lang),
{stop, Res};
webadmin_page(Acc, _, _) -> Acc.
user_queue(User, Server, Query, Lang) ->
US = {jlib:nodeprep(User), jlib:nameprep(Server)},
Res = user_queue_parse_query(US, Query),
MsgsAll = lists:keysort(#offline_msg.timestamp,
mnesia:dirty_read({offline_msg, US})),
Msgs = get_messages_subset(User, Server, MsgsAll),
FMsgs =
lists:map(
fun(#offline_msg{timestamp = TimeStamp, from = From, to = To,
packet = {xmlelement, Name, Attrs, Els}} = Msg) ->
ID = jlib:encode_base64(binary_to_list(term_to_binary(Msg))),
{{Year, Month, Day}, {Hour, Minute, Second}} =
calendar:now_to_local_time(TimeStamp),
Time = lists:flatten(
io_lib:format(
"~w-~.2.0w-~.2.0w ~.2.0w:~.2.0w:~.2.0w",
[Year, Month, Day, Hour, Minute, Second])),
SFrom = jlib:jid_to_string(From),
STo = jlib:jid_to_string(To),
Attrs2 = jlib:replace_from_to_attrs(SFrom, STo, Attrs),
Packet = {xmlelement, Name, Attrs2, Els},
FPacket = ejabberd_web_admin:pretty_print_xml(Packet),
?XE("tr",
[?XAE("td", [{"class", "valign"}], [?INPUT("checkbox", "selected", ID)]),
?XAC("td", [{"class", "valign"}], Time),
?XAC("td", [{"class", "valign"}], SFrom),
?XAC("td", [{"class", "valign"}], STo),
?XAE("td", [{"class", "valign"}], [?XC("pre", FPacket)])]
)
end, Msgs),
[?XC("h1", io_lib:format(?T("~s's Offline Messages Queue"),
[us_to_list(US)]))] ++
case Res of
ok -> [?XREST("Submitted")];
nothing -> []
end ++
[?XAE("form", [{"action", ""}, {"method", "post"}],
[?XE("table",
[?XE("thead",
[?XE("tr",
[?X("td"),
?XCT("td", "Time"),
?XCT("td", "From"),
?XCT("td", "To"),
?XCT("td", "Packet")
])]),
?XE("tbody",
if
FMsgs == [] ->
[?XE("tr",
[?XAC("td", [{"colspan", "4"}], " ")]
)];
true ->
FMsgs
end
)]),
?BR,
?INPUTT("submit", "delete", "Delete Selected")
])].
user_queue_parse_query(US, Query) ->
case lists:keysearch("delete", 1, Query) of
{value, _} ->
Msgs = lists:keysort(#offline_msg.timestamp,
mnesia:dirty_read({offline_msg, US})),
F = fun() ->
lists:foreach(
fun(Msg) ->
ID = jlib:encode_base64(
binary_to_list(term_to_binary(Msg))),
case lists:member({"selected", ID}, Query) of
true ->
mnesia:delete_object(Msg);
false ->
ok
end
end, Msgs)
end,
mnesia:transaction(F),
ok;
false ->
nothing
end.
us_to_list({User, Server}) ->
jlib:jid_to_string({User, Server, ""}).
get_queue_length(User, Server) ->
length(mnesia:dirty_read({offline_msg, {User, Server}})).
get_messages_subset(User, Host, MsgsAll) ->
Access = gen_mod:get_module_opt(Host, ?MODULE, access_max_user_messages,
max_user_offline_messages),
MaxOfflineMsgs = case get_max_user_messages(Access, User, Host) of
Number when is_integer(Number) -> Number;
_ -> 100
end,
Length = length(MsgsAll),
get_messages_subset2(MaxOfflineMsgs, Length, MsgsAll).
get_messages_subset2(Max, Length, MsgsAll) when Length =< Max*2 ->
MsgsAll;
get_messages_subset2(Max, Length, MsgsAll) ->
FirstN = Max,
{MsgsFirstN, Msgs2} = lists:split(FirstN, MsgsAll),
MsgsLastN = lists:nthtail(Length - FirstN - FirstN, Msgs2),
NoJID = jlib:make_jid("...", "...", ""),
IntermediateMsg = #offline_msg{timestamp = now(), from = NoJID, to = NoJID,
packet = {xmlelement, "...", [], []}},
MsgsFirstN ++ [IntermediateMsg] ++ MsgsLastN.
webadmin_user(Acc, User, Server, Lang) ->
QueueLen = get_queue_length(jlib:nodeprep(User), jlib:nameprep(Server)),
FQueueLen = [?AC("queue/",
integer_to_list(QueueLen))],
Acc ++ [?XCT("h3", "Offline Messages:")] ++ FQueueLen ++ [?C(" "), ?INPUTT("submit", "removealloffline", "Remove All Offline Messages")].
webadmin_user_parse_query(_, "removealloffline", User, Server, _Query) ->
US = {User, Server},
F = fun() ->
mnesia:write_lock_table(offline_msg),
lists:foreach(
fun(Msg) ->
mnesia:delete_object(Msg)
end, mnesia:dirty_read({offline_msg, US}))
end,
case mnesia:transaction(F) of
{aborted, Reason} ->
?ERROR_MSG("Failed to remove offline messages: ~p", [Reason]),
{stop, error};
{atomic, ok} ->
?INFO_MSG("Removed all offline messages for ~s@~s", [User, Server]),
{stop, ok}
end;
webadmin_user_parse_query(Acc, _Action, _User, _Server, _Query) ->
Acc.
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