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

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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 (obsolete)
%%% 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_odbc).
-author('alexey@process-one.net').
-behaviour(gen_mod).
-export([count_offline_messages/2]).
-export([start/2,
loop/2,
stop/1,
store_packet/3,
pop_offline_messages/3,
get_sm_features/5,
remove_user/2,
get_queue_length/2,
webadmin_page/3,
webadmin_user/4,
webadmin_user_parse_query/5]).
-include_lib("exmpp/include/exmpp.hrl").
-include("ejabberd.hrl").
-include("web/ejabberd_http.hrl").
-include("web/ejabberd_web_admin.hrl").
-record(offline_msg, {user, server, timestamp, expire, from, to, packet}).
-define(PROCNAME, ejabberd_offline).
-define(OFFLINE_TABLE_LOCK_THRESHOLD, 1000).
% These are the namespace already declared by the stream opening. This is
% used at serialization time.
-define(DEFAULT_NS, ?NS_JABBER_CLIENT).
-define(PREFIXED_NS, [{?NS_XMPP, ?NS_XMPP_pfx}]).
%% default value for the maximum number of user messages
-define(MAX_USER_MESSAGES, infinity).
start(Host, Opts) ->
HostB = list_to_binary(Host),
ejabberd_hooks:add(offline_message_hook, HostB,
?MODULE, store_packet, 50),
ejabberd_hooks:add(resend_offline_messages_hook, HostB,
?MODULE, pop_offline_messages, 50),
ejabberd_hooks:add(remove_user, HostB,
?MODULE, remove_user, 50),
ejabberd_hooks:add(anonymous_purge_hook, HostB,
?MODULE, remove_user, 50),
ejabberd_hooks:add(disco_sm_features, HostB,
?MODULE, get_sm_features, 50),
ejabberd_hooks:add(disco_local_features, HostB,
?MODULE, get_sm_features, 50),
ejabberd_hooks:add(webadmin_page_host, HostB,
?MODULE, webadmin_page, 50),
ejabberd_hooks:add(webadmin_user, HostB,
?MODULE, webadmin_user, 50),
ejabberd_hooks:add(webadmin_user_parse_query, HostB,
?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, [Host, AccessMaxOfflineMsgs])).
loop(Host, AccessMaxOfflineMsgs) ->
receive
#offline_msg{user = User, server = Server} = Msg ->
Msgs = receive_all(User, Server, [Msg]),
Len = length(Msgs),
MaxOfflineMsgs = get_max_user_messages(AccessMaxOfflineMsgs,
User, Host),
%% Only count existing messages if needed:
Count = if MaxOfflineMsgs =/= infinity ->
Len + count_offline_messages(User, Server);
true -> 0
end,
if
Count > MaxOfflineMsgs ->
discard_warn_sender(Msgs);
true ->
Query = lists:map(
fun(M) ->
Username =
ejabberd_odbc:escape(
exmpp_jid:prep_node_as_list(M#offline_msg.to)),
From = M#offline_msg.from,
To = M#offline_msg.to,
Packet0 = exmpp_stanza:set_jids(
M#offline_msg.packet,
From,
To),
Packet1 = exmpp_xml:append_children(
Packet0,
[jlib:timestamp_to_xml(
calendar:now_to_universal_time(
M#offline_msg.timestamp),
utc,
exmpp_jid:make("", Host, ""),
"Offline Storage"),
%% TODO: Delete the next three lines once XEP-0091 is Obsolete
jlib:timestamp_to_xml(
calendar:now_to_universal_time(
M#offline_msg.timestamp))]),
XML =
ejabberd_odbc:escape(
exmpp_xml:document_to_list(Packet1)),
odbc_queries:add_spool_sql(Server, Username, XML)
end, Msgs),
case catch odbc_queries:add_spool(Server, Query) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~n", [Reason]);
{error, Reason} ->
?ERROR_MSG("~p~n", [Reason]);
_ ->
ok
end
end,
loop(Host, AccessMaxOfflineMsgs);
_ ->
loop(Host, AccessMaxOfflineMsgs)
end.
%% Function copied from ejabberd_sm.erl:
get_max_user_messages(AccessRule, LUser, Host) ->
case acl:match_rule(
Host, AccessRule, exmpp_jid:make(LUser, Host, "")) of
Max when is_integer(Max) -> Max;
infinity -> infinity;
_ -> ?MAX_USER_MESSAGES
end.
receive_all(Username, Server, Msgs) ->
receive
#offline_msg{user = Username, server = Server} = Msg ->
receive_all(Username, Server, [Msg | Msgs])
after 0 ->
lists:reverse(Msgs)
end.
stop(Host) ->
HostB = list_to_binary(Host),
ejabberd_hooks:delete(offline_message_hook, HostB,
?MODULE, store_packet, 50),
ejabberd_hooks:delete(resend_offline_messages_hook, HostB,
?MODULE, pop_offline_messages, 50),
ejabberd_hooks:delete(remove_user, HostB,
?MODULE, remove_user, 50),
ejabberd_hooks:delete(anonymous_purge_hook, HostB,
?MODULE, remove_user, 50),
ejabberd_hooks:delete(disco_sm_features, HostB, ?MODULE, get_sm_features, 50),
ejabberd_hooks:delete(disco_local_features, HostB, ?MODULE, get_sm_features, 50),
ejabberd_hooks:delete(webadmin_page_host, HostB,
?MODULE, webadmin_page, 50),
ejabberd_hooks:delete(webadmin_user, HostB,
?MODULE, webadmin_user, 50),
ejabberd_hooks:delete(webadmin_user_parse_query, HostB,
?MODULE, webadmin_user_parse_query, 50),
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
exit(whereis(Proc), stop),
ok.
get_sm_features(Acc, _From, _To, "", _Lang) ->
Feats = case Acc of
{result, I} -> I;
_ -> []
end,
{result, Feats ++ [?NS_MSGOFFLINE]};
get_sm_features(_Acc, _From, _To, ?NS_MSGOFFLINE, _Lang) ->
%% override all lesser features...
{result, []};
get_sm_features(Acc, _From, _To, _Node, _Lang) ->
Acc.
store_packet(From, To, Packet) ->
Type = exmpp_stanza:get_type(Packet),
if
(Type /= <<"error">>) and (Type /= <<"groupchat">>) and
(Type /= <<"headline">>) ->
case check_event_chatstates(From, To, Packet) of
true ->
LUser = exmpp_jid:prep_node_as_list(To),
LServer = exmpp_jid:prep_domain_as_list(To),
TimeStamp = now(),
Expire = find_x_expire(TimeStamp, Packet#xmlel.children),
Proc1 = gen_mod:get_module_proc(LServer, ?PROCNAME),
Proc = case whereis(Proc1) of
undefined ->
gen_mod:get_module_proc(global, ?PROCNAME);
_ ->
Proc1
end,
Proc !
#offline_msg{user = LUser,
server = 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) ->
case find_x_event_chatstates(Packet#xmlel.children, {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 exmpp_xml:get_element(El, 'id') of
undefined ->
case exmpp_xml:get_element(El, 'offline') of
undefined ->
true;
_ ->
ID = case exmpp_stanza:get_id(Packet) of
undefined ->
#xmlel{ns = ?NS_MESSAGE_EVENT, name = 'id'};
S ->
#xmlel{ns = ?NS_MESSAGE_EVENT, name = 'id',
children = [#xmlcdata{cdata =
S}]}
end,
X = #xmlel{ns = ?NS_MESSAGE_EVENT, name = 'x', children =
[ID, #xmlel{ns = ?NS_MESSAGE_EVENT, name = 'offline'}]},
ejabberd_router:route(
To, From, exmpp_xml:set_children(Packet, [X])),
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([#xmlel{ns = ?NS_MESSAGE_EVENT} = El | Els], {_, B, C}) ->
find_x_event_chatstates(Els, {El, B, C});
find_x_event_chatstates([#xmlel{ns = ?NS_CHATSTATES} = El | Els], {A, _, C}) ->
find_x_event_chatstates(Els, {A, El, C});
find_x_event_chatstates([#xmlcdata{} = _ | Els], {A, B, C}) ->
find_x_event_chatstates(Els, {A, B, C});
find_x_event_chatstates([_ | Els], {A, B, _}) ->
find_x_event_chatstates(Els, {A, B, true}).
find_x_expire(_, []) ->
never;
find_x_expire(TimeStamp, [#xmlel{ns = ?NS_MESSAGE_EXPIRE} = El | _Els]) ->
Val = exmpp_xml:get_attribute_as_list(El, 'seconds', ""),
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]) ->
find_x_expire(TimeStamp, Els).
pop_offline_messages(Ls, User, Server)
when is_binary(User), is_binary(Server) ->
try
LUser = binary_to_list(User),
LServer = binary_to_list(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}) ->
try
[El] = exmpp_xml:parse_document(XML,
[names_as_atom, {check_elems, xmpp},
{check_nss,xmpp}, {check_attrs,xmpp}]),
To = exmpp_jid:parse(
exmpp_stanza:get_recipient(El)),
From = exmpp_jid:parse(
exmpp_stanza:get_sender(El)),
[{route, From, To, El}]
catch
_ ->
[]
end
end, Rs);
_ ->
Ls
end
catch
_ ->
[]
end.
remove_user(User, Server)
when is_binary(User), is_binary(Server) ->
try
LUser = binary_to_list(exmpp_stringprep:nodeprep(User)),
LServer = binary_to_list(exmpp_stringprep:nameprep(Server)),
Username = ejabberd_odbc:escape(LUser),
odbc_queries:del_spool_msg(LServer, Username)
catch
_ ->
ok
end.
%% 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.",
Error = exmpp_stanza:error(Packet#xmlel.ns, 'resource-constraint',
{"en", ErrText}),
Err = exmpp_stanza:reply_with_error(Packet, Error),
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, MsgsAll, Res} = try
LUser = exmpp_stringprep:nodeprep(User),
LServer = exmpp_stringprep:nameprep(Server),
Username = ejabberd_odbc:escape(LUser),
Host = ejabberd_odbc:escape(LServer),
US0 = {LUser, LServer},
R = user_queue_parse_query(Username, LServer, Query),
M = case catch ejabberd_odbc:sql_query(
LServer,
["select username, xml from spool"
" where username='", Username, "'"
" and host='", Host, "'"
" order by seq;"]) of
{selected, ["username", "xml"], Rs} ->
lists:flatmap(
fun({_, XML}) ->
try exmpp_xml:parse_document(XML,
[names_as_atom, {check_elems, xmpp},
{check_nss,xmpp}, {check_attrs,xmpp}]) of
[El] ->
[El]
catch
_ ->
[]
end
end, Rs);
_ ->
[]
end,
{US0, M, R}
catch
_ ->
{{"invalid", "invalid"}, [], nothing}
end,
Msgs = get_messages_subset(User, Server, MsgsAll),
FMsgs =
lists:map(
fun(#xmlel{} = Msg) ->
ID = jlib:encode_base64(binary_to_list(term_to_binary(Msg))),
Packet = Msg,
FPacket = exmpp_xml:node_to_list(
exmpp_xml:indent_document(Packet, <<" ">>),
[?DEFAULT_NS], ?PREFIXED_NS),
?XE("tr",
[?XAE("td", [?XMLATTR('class', <<"valign">>)], [?INPUT("checkbox", "selected", ID)]),
?XAE("td", [?XMLATTR('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", [?XMLATTR('action', <<"">>), ?XMLATTR('method', <<"post">>)],
[?XE("table",
[?XE("thead",
[?XE("tr",
[?X("td"),
?XCT("td", "Packet")
])]),
?XE("tbody",
if
FMsgs == [] ->
[?XE("tr",
[?XAC("td", [?XMLATTR('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, _} ->
Host = ejabberd_odbc:escape(LServer),
Msgs = case catch ejabberd_odbc:sql_query(
LServer,
["select xml, seq from spool"
" where username='", Username, "' and"
" host='", Host, "'"
" order by seq;"]) of
{selected, ["xml", "seq"], Rs} ->
lists:flatmap(
fun({XML, Seq}) ->
try exmpp_xml:parse_document(XML,
[names_as_atom, {check_elems, xmpp},
{check_nss,xmpp}, {check_attrs,xmpp}]) of
[El] ->
[{El, Seq}]
catch
_ ->
[]
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 host='", Host, "'"
" and seq='", SSeq, "';"]);
false ->
ok
end
end, Msgs)
end,
mnesia:transaction(F),
ok;
false ->
nothing
end.
us_to_list({User, Server}) ->
exmpp_jid:to_list(User, Server).
get_queue_length(Username, LServer) ->
Host = ejabberd_odbc:escape(LServer),
case catch ejabberd_odbc:sql_query(
LServer,
["select count(*) from spool"
" where username='", Username, "'"
" and host='", Host, "';"]) of
{selected, [_], [{SCount}]} ->
SCount;
_ ->
0
end.
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),
IntermediateMsg = exmpp_xml:element("..."),
MsgsFirstN ++ [IntermediateMsg] ++ MsgsLastN.
webadmin_user(Acc, User, Server, Lang) ->
LUser = exmpp_stringprep:nodeprep(User),
LServer = exmpp_stringprep:nameprep(Server),
Username = ejabberd_odbc:escape(LUser),
QueueLen = get_queue_length(Username, LServer),
FQueueLen = [?AC("queue/", QueueLen)],
Acc ++ [?XCT("h3", "Offline Messages:")] ++ FQueueLen ++ [?C(" "), ?INPUTT("submit", "removealloffline", "Remove All Offline Messages")].
webadmin_user_parse_query(_, "removealloffline", User, Server, _Query) ->
case catch odbc_queries:del_spool_msg(Server, User) of
{'EXIT', Reason} ->
?ERROR_MSG("Failed to remove offline messages: ~p", [Reason]),
{stop, error};
{error, Reason} ->
?ERROR_MSG("Failed to remove offline messages: ~p", [Reason]),
{stop, error};
_ ->
?INFO_MSG("Removed all offline messages for ~s@~s", [User, Server]),
{stop, ok}
end;
webadmin_user_parse_query(Acc, _Action, _User, _Server, _Query) ->
Acc.
%% ------------------------------------------------
%% 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),
Host = ejabberd_odbc:escape(LServer),
case catch odbc_queries:count_records_where(
LServer, "spool", "where username='" ++ Username ++
"' and host='" ++ Host ++ "'") of
{selected, [_], [{Res}]} ->
list_to_integer(Res);
_ ->
0
end.
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