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xmpp.chapril.org-ejabberd/src/mod_offline_odbc.erl
Badlop 2d2fcc8210 * doc/guide.tex: Updated copyright dates to 2008 
* src/*: Likewise

SVN Revision: 1153
2008-01-15 17:02:57 +00:00

455 lines
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Erlang
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%%%----------------------------------------------------------------------
%%% File : mod_offline_odbc.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Store and manage offline messages in relational database.
%%% Created : 5 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2008 Process-one
%%%
%%% 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_odbc).
-author('alexey@process-one.net').
-behaviour(gen_mod).
-export([count_offline_messages/2]).
-export([start/2,
init/2,
stop/1,
store_packet/3,
pop_offline_messages/3,
remove_user/2,
webadmin_page/3,
webadmin_user/4]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-include("web/ejabberd_http.hrl").
-include("web/ejabberd_web_admin.hrl").
-record(offline_msg, {user, timestamp, expire, from, to, packet}).
-define(PROCNAME, ejabberd_offline).
-define(OFFLINE_TABLE_LOCK_THRESHOLD, 1000).
start(Host, Opts) ->
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(webadmin_page_host, Host,
?MODULE, webadmin_page, 50),
ejabberd_hooks:add(webadmin_user, Host,
?MODULE, webadmin_user, 50),
MaxOfflineMsgs = gen_mod:get_opt(user_max_messages, Opts, infinity),
register(gen_mod:get_module_proc(Host, ?PROCNAME),
spawn(?MODULE, init, [Host, MaxOfflineMsgs])).
%% MaxOfflineMsgs is either infinity of integer > 0
init(Host, infinity) ->
loop(Host, infinity);
init(Host, MaxOfflineMsgs)
when integer(MaxOfflineMsgs), MaxOfflineMsgs > 0 ->
loop(Host, MaxOfflineMsgs).
loop(Host, MaxOfflineMsgs) ->
receive
#offline_msg{user = User} = Msg ->
Msgs = receive_all(User, [Msg]),
Len = length(Msgs),
%% Only count existing messages if needed:
Count = if MaxOfflineMsgs =/= infinity ->
Len + count_offline_messages(User, Host);
true -> 0
end,
if
Count > MaxOfflineMsgs ->
discard_warn_sender(Msgs);
true ->
Query = lists:map(
fun(M) ->
Username =
ejabberd_odbc:escape(
(M#offline_msg.to)#jid.luser),
From = M#offline_msg.from,
To = M#offline_msg.to,
{xmlelement, Name, Attrs, Els} =
M#offline_msg.packet,
Attrs2 = jlib:replace_from_to_attrs(
jlib:jid_to_string(From),
jlib:jid_to_string(To),
Attrs),
Packet = {xmlelement, Name, Attrs2,
Els ++
[jlib:timestamp_to_xml(
calendar:now_to_universal_time(
M#offline_msg.timestamp))]},
XML =
ejabberd_odbc:escape(
lists:flatten(
xml:element_to_string(Packet))),
odbc_queries:add_spool_sql(Username, XML)
end, Msgs),
case catch odbc_queries:add_spool(Host, Query) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~n", [Reason]);
_ ->
ok
end
end,
loop(Host, MaxOfflineMsgs);
_ ->
loop(Host, MaxOfflineMsgs)
end.
receive_all(Username, Msgs) ->
receive
#offline_msg{user=Username} = Msg ->
receive_all(Username, [Msg | Msgs])
after 0 ->
lists:reverse(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(webadmin_page_host, Host,
?MODULE, webadmin_page, 50),
ejabberd_hooks:delete(webadmin_user, Host,
?MODULE, webadmin_user, 50),
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
exit(whereis(Proc), stop),
ok.
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(From, To, Packet) of
true ->
#jid{luser = LUser} = 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{user = LUser,
timestamp = TimeStamp,
expire = Expire,
from = From,
to = To,
packet = Packet},
stop;
_ ->
ok
end;
true ->
ok
end.
check_event(From, To, Packet) ->
{xmlelement, Name, Attrs, Els} = Packet,
case find_x_event(Els) of
false ->
true;
El ->
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.
find_x_event([]) ->
false;
find_x_event([{xmlcdata, _} | Els]) ->
find_x_event(Els);
find_x_event([El | Els]) ->
case xml:get_tag_attr_s("xmlns", El) of
?NS_EVENT ->
El;
_ ->
find_x_event(Els)
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.
pop_offline_messages(Ls, User, Server) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
EUser = ejabberd_odbc:escape(LUser),
case odbc_queries:get_and_del_spool_msg_t(LServer, EUser) of
{atomic, {selected, ["username","xml"], Rs}} ->
Ls ++ lists:flatmap(
fun({_, XML}) ->
case xml_stream:parse_element(XML) of
{error, _Reason} ->
[];
El ->
To = jlib:string_to_jid(
xml:get_tag_attr_s("to", El)),
From = jlib:string_to_jid(
xml:get_tag_attr_s("from", El)),
if
(To /= error) and
(From /= error) ->
[{route, From, To, El}];
true ->
[]
end
end
end, Rs);
_ ->
Ls
end.
remove_user(User, Server) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
Username = ejabberd_odbc:escape(LUser),
odbc_queries:del_spool_msg(LServer, Username).
%% Helper functions:
%% TODO: Warning - This function is a duplicate from mod_offline.erl
%% It is duplicate to stay consistent (many functions are duplicated
%% in this module). It will be refactored later on.
%% 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) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
Username = ejabberd_odbc:escape(LUser),
US = {LUser, LServer},
Res = user_queue_parse_query(Username, LServer, Query),
Msgs = case catch ejabberd_odbc:sql_query(
LServer,
["select username, xml from spool"
" where username='", Username, "'"
" order by seq;"]) of
{selected, ["username", "xml"], Rs} ->
lists:flatmap(
fun({_, XML}) ->
case xml_stream:parse_element(XML) of
{error, _Reason} ->
[];
El ->
[El]
end
end, Rs);
_ ->
[]
end,
FMsgs =
lists:map(
fun({xmlelement, _Name, _Attrs, _Els} = Msg) ->
ID = jlib:encode_base64(binary_to_list(term_to_binary(Msg))),
Packet = Msg,
FPacket = ejabberd_web_admin:pretty_print_xml(Packet),
?XE("tr",
[?XAE("td", [{"class", "valign"}], [?INPUT("checkbox", "selected", ID)]),
?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 -> [?CT("Submitted"), ?P];
nothing -> []
end ++
[?XAE("form", [{"action", ""}, {"method", "post"}],
[?XE("table",
[?XE("thead",
[?XE("tr",
[?X("td"),
?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(Username, LServer, Query) ->
case lists:keysearch("delete", 1, Query) of
{value, _} ->
Msgs = case catch ejabberd_odbc:sql_query(
LServer,
["select xml, seq from spool"
" where username='", Username, "'"
" order by seq;"]) of
{selected, ["xml", "seq"], Rs} ->
lists:flatmap(
fun({XML, Seq}) ->
case xml_stream:parse_element(XML) of
{error, _Reason} ->
[];
El ->
[{El, Seq}]
end
end, Rs);
_ ->
[]
end,
F = fun() ->
lists:foreach(
fun({Msg, Seq}) ->
ID = jlib:encode_base64(
binary_to_list(term_to_binary(Msg))),
case lists:member({"selected", ID}, Query) of
true ->
SSeq = ejabberd_odbc:escape(Seq),
catch ejabberd_odbc:sql_query(
LServer,
["delete from spool"
" where username='", Username, "'"
" and seq='", SSeq, "';"]);
false ->
ok
end
end, Msgs)
end,
mnesia:transaction(F),
ok;
false ->
nothing
end.
us_to_list({User, Server}) ->
jlib:jid_to_string({User, Server, ""}).
webadmin_user(Acc, User, Server, Lang) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
Username = ejabberd_odbc:escape(LUser),
QueueLen = case catch ejabberd_odbc:sql_query(
LServer,
["select count(*) from spool"
" where username='", Username, "';"]) of
{selected, [_], [{SCount}]} ->
SCount;
_ ->
0
end,
FQueueLen = [?AC("queue/", QueueLen)],
Acc ++ [?XCT("h3", "Offline Messages:")] ++ FQueueLen.
%% ------------------------------------------------
%% mod_offline: number of messages quota management
%% Returns as integer the number of offline messages for a given user
count_offline_messages(LUser, LServer) ->
Username = ejabberd_odbc:escape(LUser),
case catch odbc_queries:count_records_where(
LServer, "spool", "where username='" ++ Username ++ "'") of
{selected, [_], [{Res}]} ->
list_to_integer(Res);
_ ->
0
end.
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