aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/muc/muc.lib.lua
blob: 7f8cc016ed8fb23d6d69481c9e23e3179b431bd1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
-- Copyright (C) 2014 Daurnimator
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

local select = select;
local pairs, ipairs = pairs, ipairs;

local gettime = os.time;
local datetime = require "util.datetime";

local dataform = require "util.dataforms";

local jid_split = require "util.jid".split;
local jid_bare = require "util.jid".bare;
local jid_prep = require "util.jid".prep;
local st = require "util.stanza";
local log = require "util.logger".init("mod_muc");
local t_insert, t_remove = table.insert, table.remove;
local setmetatable = setmetatable;
local base64 = require "util.encodings".base64;
local md5 = require "util.hashes".md5;

local default_history_length, max_history_length = 20, math.huge;

local get_filtered_presence do
	local presence_filters = {
		["http://jabber.org/protocol/muc"] = true;
		["http://jabber.org/protocol/muc#user"] = true;
	}
	local function presence_filter(tag)
		if presence_filters[tag.attr.xmlns] then
			return nil;
		end
		return tag;
	end
	function get_filtered_presence(stanza)
		return st.clone(stanza):maptags(presence_filter);
	end
end

local is_kickable_error do
	local kickable_error_conditions = {
		["gone"] = true;
		["internal-server-error"] = true;
		["item-not-found"] = true;
		["jid-malformed"] = true;
		["recipient-unavailable"] = true;
		["redirect"] = true;
		["remote-server-not-found"] = true;
		["remote-server-timeout"] = true;
		["service-unavailable"] = true;
		["malformed error"] = true;
	};
	function is_kickable_error(stanza)
		local cond = select(2, stanza:get_error()) or "malformed error";
		return kickable_error_conditions[cond];
	end
end

local room_mt = {};
room_mt.__index = room_mt;

function room_mt:__tostring()
	return "MUC room ("..self.jid..")";
end

function room_mt:get_occupant_jid(real_jid)
	return self._jid_nick[real_jid]
end

function room_mt:get_default_role(affiliation)
	if affiliation == "owner" or affiliation == "admin" then
		return "moderator";
	elseif affiliation == "member" then
		return "participant";
	elseif not affiliation then
		if not self:get_members_only() then
			return self:get_moderated() and "visitor" or "participant";
		end
	end
end

function room_mt:lock()
	self.locked = true
end
function room_mt:unlock()
	module:fire_event("muc-room-unlocked", { room = self });
	self.locked = nil
end
function room_mt:is_locked()
	return not not self.locked
end

function room_mt:route_to_occupant(o_data, stanza)
	local to = stanza.attr.to;
	for jid in pairs(o_data.sessions) do
		stanza.attr.to = jid;
		self:_route_stanza(stanza);
	end
	stanza.attr.to = to;
end

function room_mt:broadcast_presence(stanza, sid, code, nick)
	stanza = get_filtered_presence(stanza);
	local occupant = self._occupants[stanza.attr.from];
	stanza:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
		:tag("item", {affiliation=occupant.affiliation or "none", role=occupant.role or "none", nick=nick}):up();
	if code then
		stanza:tag("status", {code=code}):up();
	end
	self:broadcast_except_nick(stanza, stanza.attr.from);
	local me = self._occupants[stanza.attr.from];
	if me then
		stanza:tag("status", {code='110'}):up();
		stanza.attr.to = sid;
		self:_route_stanza(stanza);
	end
end
function room_mt:broadcast_message(stanza, historic)
	for occupant_jid, o_data in pairs(self._occupants) do
		self:route_to_occupant(o_data, stanza)
	end
	if historic then -- add to history
		return self:save_to_history(stanza)
	end
end
function room_mt:save_to_history(stanza)
	local history = self._data['history'];
	if not history then history = {}; self._data['history'] = history; end
	stanza = st.clone(stanza);
	stanza.attr.to = "";
	local stamp = datetime.datetime();
	stanza:tag("delay", {xmlns = "urn:xmpp:delay", from = module.host, stamp = stamp}):up(); -- XEP-0203
	stanza:tag("x", {xmlns = "jabber:x:delay", from = module.host, stamp = datetime.legacy()}):up(); -- XEP-0091 (deprecated)
	local entry = { stanza = stanza, stamp = stamp };
	t_insert(history, entry);
	while #history > (self._data.history_length or default_history_length) do t_remove(history, 1) end
end
function room_mt:broadcast_except_nick(stanza, nick)
	for rnick, occupant in pairs(self._occupants) do
		if rnick ~= nick then
			for jid in pairs(occupant.sessions) do
				stanza.attr.to = jid;
				self:_route_stanza(stanza);
			end
		end
	end
end

function room_mt:send_occupant_list(to)
	local current_nick = self:get_occupant_jid(to);
	for occupant, o_data in pairs(self._occupants) do
		if occupant ~= current_nick then
			local pres = get_filtered_presence(o_data.sessions[o_data.jid]);
			pres.attr.to, pres.attr.from = to, occupant;
			pres:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
				:tag("item", {affiliation=o_data.affiliation or "none", role=o_data.role or "none"}):up();
			self:_route_stanza(pres);
		end
	end
end

local function parse_history(stanza)
	local x_tag = stanza:get_child("x", "http://jabber.org/protocol/muc");
	local history_tag = x_tag and x_tag:get_child("history", "http://jabber.org/protocol/muc");
	if not history_tag then
		return nil, 20, nil
	end

	local maxchars = tonumber(history_tag.attr.maxchars);

	local maxstanzas = tonumber(history_tag.attr.maxstanzas);

	-- messages received since the UTC datetime specified
	local since = history_tag.attr.since;
	if since then
		since = datetime.parse(since);
	end

	-- messages received in the last "X" seconds.
	local seconds = tonumber(history_tag.attr.seconds);
	if seconds then
		seconds = gettime() - seconds
		if since then
			since = math.max(since, seconds);
		else
			since = seconds;
		end
	end

	return maxchars, maxstanzas, since
end
-- Get history for 'to'
function room_mt:get_history(to, maxchars, maxstanzas, since)
	local history = self._data['history']; -- send discussion history
	if not history then return function() end end
	local history_len = #history

	maxstanzas = maxstanzas or history_len
	local n = 0;
	local charcount = 0;
	for i=history_len,1,-1 do
		local entry = history[i];
		if maxchars then
			if not entry.chars then
				entry.stanza.attr.to = "";
				entry.chars = #tostring(entry.stanza);
			end
			charcount = charcount + entry.chars + #to;
			if charcount > maxchars then break; end
		end
		if since and since > entry.stamp then break; end
		if n + 1 > maxstanzas then break; end
		n = n + 1;
	end

	local i = history_len-n+1
	return function()
		if i > history_len then return nil end
		local entry = history[i]
		local msg = entry.stanza
		msg.attr.to = to;
		i = i + 1
		return msg
	end
end
function room_mt:send_history(to, stanza)
	local maxchars, maxstanzas, since = parse_history(stanza)
	for msg in self:get_history(to, maxchars, maxstanzas, since) do
		self:_route_stanza(msg);
	end
end
function room_mt:send_subject(to)
	if self._data['subject'] then
		self:_route_stanza(st.message({type='groupchat', from=self._data['subject_from'] or self.jid, to=to}):tag("subject"):text(self._data['subject']));
	end
end

function room_mt:get_disco_info(stanza)
	local count = 0; for _ in pairs(self._occupants) do count = count + 1; end
	return st.reply(stanza):query("http://jabber.org/protocol/disco#info")
		:tag("identity", {category="conference", type="text", name=self:get_name()}):up()
		:tag("feature", {var="http://jabber.org/protocol/muc"}):up()
		:tag("feature", {var=self:get_password() and "muc_passwordprotected" or "muc_unsecured"}):up()
		:tag("feature", {var=self:get_moderated() and "muc_moderated" or "muc_unmoderated"}):up()
		:tag("feature", {var=self:get_members_only() and "muc_membersonly" or "muc_open"}):up()
		:tag("feature", {var=self:get_persistent() and "muc_persistent" or "muc_temporary"}):up()
		:tag("feature", {var=self:get_hidden() and "muc_hidden" or "muc_public"}):up()
		:tag("feature", {var=self:get_whois() ~= "anyone" and "muc_semianonymous" or "muc_nonanonymous"}):up()
		:add_child(dataform.new({
			{ name = "FORM_TYPE", type = "hidden", value = "http://jabber.org/protocol/muc#roominfo" },
			{ name = "muc#roominfo_description", label = "Description", value = "" },
			{ name = "muc#roominfo_occupants", label = "Number of occupants", value = tostring(count) }
		}):form({["muc#roominfo_description"] = self:get_description()}, 'result'))
	;
end
function room_mt:get_disco_items(stanza)
	local reply = st.reply(stanza):query("http://jabber.org/protocol/disco#items");
	for room_jid in pairs(self._occupants) do
		reply:tag("item", {jid = room_jid, name = room_jid:match("/(.*)")}):up();
	end
	return reply;
end
function room_mt:set_subject(current_nick, subject)
	if subject == "" then subject = nil; end
	self._data['subject'] = subject;
	self._data['subject_from'] = current_nick;
	if self.save then self:save(); end
	local msg = st.message({type='groupchat', from=current_nick})
		:tag('subject'):text(subject):up();
	self:broadcast_message(msg, false);
	return true;
end

function room_mt:handle_kickable(origin, stanza)
	local type, condition, text = stanza:get_error();
	local error_message = "Kicked: "..(condition and condition:gsub("%-", " ") or "presence error");
	if text then
		error_message = error_message..": "..text;
	end
	local kick_stanza = st.presence({type='unavailable', from=stanza.attr.from, to=stanza.attr.to})
		:tag('status'):text(error_message);
	self:handle_unavailable_to_occupant(origin, kick_stanza); -- send unavailable
	return true;
end

function room_mt:set_name(name)
	if name == "" or type(name) ~= "string" or name == (jid_split(self.jid)) then name = nil; end
	if self._data.name ~= name then
		self._data.name = name;
		if self.save then self:save(true); end
	end
end
function room_mt:get_name()
	return self._data.name or jid_split(self.jid);
end
function room_mt:set_description(description)
	if description == "" or type(description) ~= "string" then description = nil; end
	if self._data.description ~= description then
		self._data.description = description;
		if self.save then self:save(true); end
	end
end
function room_mt:get_description()
	return self._data.description;
end
function room_mt:set_password(password)
	if password == "" or type(password) ~= "string" then password = nil; end
	if self._data.password ~= password then
		self._data.password = password;
		if self.save then self:save(true); end
	end
end
function room_mt:get_password()
	return self._data.password;
end
function room_mt:set_moderated(moderated)
	moderated = moderated and true or nil;
	if self._data.moderated ~= moderated then
		self._data.moderated = moderated;
		if self.save then self:save(true); end
	end
end
function room_mt:get_moderated()
	return self._data.moderated;
end
function room_mt:set_members_only(members_only)
	members_only = members_only and true or nil;
	if self._data.members_only ~= members_only then
		self._data.members_only = members_only;
		if self.save then self:save(true); end
	end
end
function room_mt:get_members_only()
	return self._data.members_only;
end
function room_mt:set_persistent(persistent)
	persistent = persistent and true or nil;
	if self._data.persistent ~= persistent then
		self._data.persistent = persistent;
		if self.save then self:save(true); end
	end
end
function room_mt:get_persistent()
	return self._data.persistent;
end
function room_mt:set_hidden(hidden)
	hidden = hidden and true or nil;
	if self._data.hidden ~= hidden then
		self._data.hidden = hidden;
		if self.save then self:save(true); end
	end
end
function room_mt:get_hidden()
	return self._data.hidden;
end
function room_mt:get_public()
	return not self:get_hidden();
end
function room_mt:set_public(public)
	return self:set_hidden(not public);
end
function room_mt:set_changesubject(changesubject)
	changesubject = changesubject and true or nil;
	if self._data.changesubject ~= changesubject then
		self._data.changesubject = changesubject;
		if self.save then self:save(true); end
	end
end
function room_mt:get_changesubject()
	return self._data.changesubject;
end
function room_mt:get_historylength()
	return self._data.history_length or default_history_length;
end
function room_mt:set_historylength(length)
	length = math.min(tonumber(length) or default_history_length, max_history_length or math.huge);
	if length == default_history_length then
		length = nil;
	end
	self._data.history_length = length;
end


local valid_whois = { moderators = true, anyone = true };

function room_mt:set_whois(whois)
	if valid_whois[whois] and self._data.whois ~= whois then
		self._data.whois = whois;
		if self.save then self:save(true); end
	end
end

function room_mt:get_whois()
	return self._data.whois;
end

function room_mt:handle_unavailable_to_occupant(origin, stanza)
	local from = stanza.attr.from;
	local current_nick = self:get_occupant_jid(from);
	if not current_nick then
		return true; -- discard
	end
	local pr = get_filtered_presence(stanza);
	pr.attr.from = current_nick;
	log("debug", "%s leaving %s", current_nick, self.jid);
	self._jid_nick[from] = nil;
	local occupant = self._occupants[current_nick];
	local new_jid = next(occupant.sessions);
	if new_jid == from then new_jid = next(occupant.sessions, new_jid); end
	if new_jid then
		local jid = occupant.jid;
		occupant.jid = new_jid;
		occupant.sessions[from] = nil;
		pr.attr.to = from;
		pr:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
			:tag("item", {affiliation=occupant.affiliation or "none", role='none'}):up()
			:tag("status", {code='110'}):up();
		self:_route_stanza(pr);
		if jid ~= new_jid then
			pr = st.clone(occupant.sessions[new_jid])
				:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
				:tag("item", {affiliation=occupant.affiliation or "none", role=occupant.role or "none"});
			pr.attr.from = current_nick;
			self:broadcast_except_nick(pr, current_nick);
		end
	else
		occupant.role = 'none';
		self:broadcast_presence(pr, from);
		self._occupants[current_nick] = nil;
		module:fire_event("muc-occupant-left", { room = self; nick = current_nick; });
	end
	return true;
end

function room_mt:handle_occupant_presence(origin, stanza)
	local from = stanza.attr.from;
	local pr = get_filtered_presence(stanza);
	local current_nick = stanza.attr.to
	pr.attr.from = current_nick;
	log("debug", "%s broadcasted presence", current_nick);
	self._occupants[current_nick].sessions[from] = pr;
	self:broadcast_presence(pr, from);
	return true;
end

function room_mt:handle_change_nick(origin, stanza, current_nick, to)
	local from = stanza.attr.from;
	local occupant = self._occupants[current_nick];
	local is_multisession = next(occupant.sessions, next(occupant.sessions));
	if self._occupants[to] or is_multisession then
		log("debug", "%s couldn't change nick", current_nick);
		local reply = st.error_reply(stanza, "cancel", "conflict"):up();
		reply.tags[1].attr.code = "409";
		origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
		return true;
	else
		local to_nick = select(3, jid_split(to));
		log("debug", "%s (%s) changing nick to %s", current_nick, occupant.jid, to);
		local p = st.presence({type='unavailable', from=current_nick});
		self:broadcast_presence(p, from, '303', to_nick);
		self._occupants[current_nick] = nil;
		self._occupants[to] = occupant;
		self._jid_nick[from] = to;
		local pr = get_filtered_presence(stanza);
		pr.attr.from = to;
		self._occupants[to].sessions[from] = pr;
		self:broadcast_presence(pr, from);
		return true;
	end
end

function room_mt:handle_join(origin, stanza)
	local from, to = stanza.attr.from, stanza.attr.to;
	log("debug", "%s joining as %s", from, to);
	if not next(self._affiliations) then -- new room, no owners
		self._affiliations[jid_bare(from)] = "owner";
		if self:is_locked() and not stanza:get_child("x", "http://jabber.org/protocol/muc") then
			self:unlock(); -- Older groupchat protocol doesn't lock
		end
	elseif self:is_locked() then -- Deny entry
		origin.send(st.error_reply(stanza, "cancel", "item-not-found"));
		return true;
	end
	local affiliation = self:get_affiliation(from);
	local role = self:get_default_role(affiliation)
	if role then -- new occupant
		local is_merge = not not self._occupants[to]
		if not is_merge then
			self._occupants[to] = {affiliation=affiliation, role=role, jid=from, sessions={[from]=get_filtered_presence(stanza)}};
		else
			self._occupants[to].sessions[from] = get_filtered_presence(stanza);
		end
		self._jid_nick[from] = to;
		self:send_occupant_list(from);
		local pr = get_filtered_presence(stanza);
		pr.attr.from = to;
		pr:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
			:tag("item", {affiliation=affiliation or "none", role=role or "none"}):up();
		if not is_merge then
			self:broadcast_except_nick(pr, to);
		end
		pr:tag("status", {code='110'}):up();
		if self:get_whois() == 'anyone' then
			pr:tag("status", {code='100'}):up();
		end
		if self:is_locked() then
			pr:tag("status", {code='201'}):up();
		end
		pr.attr.to = from;
		self:_route_stanza(pr);
		self:send_history(from, stanza);
		self:send_subject(from);
		return true;
	elseif not affiliation then -- registration required for entering members-only room
		local reply = st.error_reply(stanza, "auth", "registration-required"):up();
		reply.tags[1].attr.code = "407";
		origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
		return true;
	else -- banned
		local reply = st.error_reply(stanza, "auth", "forbidden"):up();
		reply.tags[1].attr.code = "403";
		origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
		return true;
	end
end

function room_mt:handle_available_to_occupant(origin, stanza)
	local from, to = stanza.attr.from, stanza.attr.to;
	local current_nick = self:get_occupant_jid(from);
	if current_nick then
		--if #pr == #stanza or current_nick ~= to then -- commented because google keeps resending directed presence
			if current_nick == to then -- simple presence
				return self:handle_occupant_presence(origin, stanza)
			else -- change nick
				return self:handle_change_nick(origin, stanza, current_nick, to)
			end
		--else -- possible rejoin
		--	log("debug", "%s had connection replaced", current_nick);
		--	self:handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to})
		--		:tag('status'):text('Replaced by new connection'):up()); -- send unavailable
		--	self:handle_to_occupant(origin, stanza); -- resend available
		--end
	else -- enter room
		local new_nick = to;
		if self._occupants[to] then
			if jid_bare(from) ~= jid_bare(self._occupants[to].jid) then
				new_nick = nil;
			end
		end
		local password = stanza:get_child("x", "http://jabber.org/protocol/muc");
		password = password and password:get_child("password", "http://jabber.org/protocol/muc");
		password = password and password[1] ~= "" and password[1];
		if self:get_password() and self:get_password() ~= password then
			log("debug", "%s couldn't join due to invalid password: %s", from, to);
			local reply = st.error_reply(stanza, "auth", "not-authorized"):up();
			reply.tags[1].attr.code = "401";
			origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
			return true;
		elseif not new_nick then
			log("debug", "%s couldn't join due to nick conflict: %s", from, to);
			local reply = st.error_reply(stanza, "cancel", "conflict"):up();
			reply.tags[1].attr.code = "409";
			origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
			return true;
		else
			return self:handle_join(origin, stanza)
		end
	end
end

function room_mt:handle_presence_to_occupant(origin, stanza)
	local type = stanza.attr.type;
	if type == "error" then -- error, kick em out!
		return self:handle_kickable(origin, stanza)
	elseif type == "unavailable" then -- unavailable
		return self:handle_unavailable_to_occupant(origin, stanza)
	elseif not type then -- available
		return self:handle_available_to_occupant(origin, stanza)
	elseif type ~= 'result' then -- bad type
		if type ~= 'visible' and type ~= 'invisible' then -- COMPAT ejabberd can broadcast or forward XEP-0018 presences
			origin.send(st.error_reply(stanza, "modify", "bad-request")); -- FIXME correct error?
		end
	end
	return true;
end

function room_mt:handle_iq_to_occupant(origin, stanza)
	local from, to = stanza.attr.from, stanza.attr.to;
	local type = stanza.attr.type;
	local id = stanza.attr.id;
	local current_nick = self:get_occupant_jid(from);
	local o_data = self._occupants[to];
	if (type == "error" or type == "result") then
		do -- deconstruct_stanza_id
			if not current_nick or not o_data then return nil; end
			local from_jid, id, to_jid_hash = (base64.decode(stanza.attr.id) or ""):match("^(.+)%z(.*)%z(.+)$");
			if not(from == from_jid or from == jid_bare(from_jid)) then return nil; end
			local session_jid
			for to_jid in pairs(o_data.sessions) do
				if md5(to_jid) == to_jid_hash then
					session_jid = to_jid;
					break;
				end
			end
			if session_jid == nil then return nil; end
			stanza.attr.from, stanza.attr.to, stanza.attr.id = current_nick, session_jid, id
		end
		log("debug", "%s sent private iq stanza to %s (%s)", from, to, stanza.attr.to);
		self:_route_stanza(stanza);
		stanza.attr.from, stanza.attr.to, stanza.attr.id = from, to, id;
		return true;
	else -- Type is "get" or "set"
		if not current_nick then
			origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
			return true;
		end
		if not o_data then -- recipient not in room
			origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Recipient not in room"));
			return true;
		end
		do -- construct_stanza_id
			stanza.attr.id = base64.encode(o_data.jid.."\0"..stanza.attr.id.."\0"..md5(from));
		end
		stanza.attr.from, stanza.attr.to = current_nick, o_data.jid;
		log("debug", "%s sent private iq stanza to %s (%s)", from, to, o_data.jid);
		if stanza.tags[1].attr.xmlns == 'vcard-temp' then
			stanza.attr.to = jid_bare(stanza.attr.to);
		end
		self:_route_stanza(stanza);
		stanza.attr.from, stanza.attr.to, stanza.attr.id = from, to, id;
		return true;
	end
end

function room_mt:handle_message_to_occupant(origin, stanza)
	local from, to = stanza.attr.from, stanza.attr.to;
	local current_nick = self:get_occupant_jid(from);
	local type = stanza.attr.type;
	if not current_nick then -- not in room
		if type ~= "error" then
			origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
		end
		return true;
	end
	if type == "groupchat" then -- groupchat messages not allowed in PM
		origin.send(st.error_reply(stanza, "modify", "bad-request"));
		return true;
	elseif type == "error" and is_kickable_error(stanza) then
		log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
		return self:handle_kickable(origin, stanza); -- send unavailable
	end

	local o_data = self._occupants[to];
	if not o_data then
		origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Recipient not in room"));
		return true;
	end
	log("debug", "%s sent private message stanza to %s (%s)", from, to, o_data.jid);
	stanza:tag("x", { xmlns = "http://jabber.org/protocol/muc#user" }):up();
	stanza.attr.from = current_nick;
	self:route_to_occupant(o_data, stanza)
	stanza.attr.from = from;
	return true;
end

function room_mt:send_form(origin, stanza)
	origin.send(st.reply(stanza):query("http://jabber.org/protocol/muc#owner")
		:add_child(self:get_form_layout(stanza.attr.from):form())
	);
end

function room_mt:get_form_layout(actor)
	local whois = self:get_whois()
	local form = dataform.new({
		title = "Configuration for "..self.jid,
		instructions = "Complete and submit this form to configure the room.",
		{
			name = 'FORM_TYPE',
			type = 'hidden',
			value = 'http://jabber.org/protocol/muc#roomconfig'
		},
		{
			name = 'muc#roomconfig_roomname',
			type = 'text-single',
			label = 'Name',
			value = self:get_name() or "",
		},
		{
			name = 'muc#roomconfig_roomdesc',
			type = 'text-single',
			label = 'Description',
			value = self:get_description() or "",
		},
		{
			name = 'muc#roomconfig_persistentroom',
			type = 'boolean',
			label = 'Make Room Persistent?',
			value = self:get_persistent()
		},
		{
			name = 'muc#roomconfig_publicroom',
			type = 'boolean',
			label = 'Make Room Publicly Searchable?',
			value = not self:get_hidden()
		},
		{
			name = 'muc#roomconfig_changesubject',
			type = 'boolean',
			label = 'Allow Occupants to Change Subject?',
			value = self:get_changesubject()
		},
		{
			name = 'muc#roomconfig_whois',
			type = 'list-single',
			label = 'Who May Discover Real JIDs?',
			value = {
				{ value = 'moderators', label = 'Moderators Only', default = whois == 'moderators' },
				{ value = 'anyone',     label = 'Anyone',          default = whois == 'anyone' }
			}
		},
		{
			name = 'muc#roomconfig_roomsecret',
			type = 'text-private',
			label = 'Password',
			value = self:get_password() or "",
		},
		{
			name = 'muc#roomconfig_moderatedroom',
			type = 'boolean',
			label = 'Make Room Moderated?',
			value = self:get_moderated()
		},
		{
			name = 'muc#roomconfig_membersonly',
			type = 'boolean',
			label = 'Make Room Members-Only?',
			value = self:get_members_only()
		},
		{
			name = 'muc#roomconfig_historylength',
			type = 'text-single',
			label = 'Maximum Number of History Messages Returned by Room',
			value = tostring(self:get_historylength())
		}
	});
	return module:fire_event("muc-config-form", { room = self, actor = actor, form = form }) or form;
end

function room_mt:process_form(origin, stanza)
	local query = stanza.tags[1];
	local form = query:get_child("x", "jabber:x:data")
	if not form then origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); return; end
	if form.attr.type == "cancel" then origin.send(st.reply(stanza)); return; end
	if form.attr.type ~= "submit" then origin.send(st.error_reply(stanza, "cancel", "bad-request", "Not a submitted form")); return; end

	local fields = self:get_form_layout(stanza.attr.from):data(form);
	if fields.FORM_TYPE ~= "http://jabber.org/protocol/muc#roomconfig" then origin.send(st.error_reply(stanza, "cancel", "bad-request", "Form is not of type room configuration")); return; end


	local changed = {};

	local function handle_option(name, field, allowed)
		local new = fields[field];
		if new == nil then return; end
		if allowed and not allowed[new] then return; end
		if new == self["get_"..name](self) then return; end
		changed[name] = true;
		self["set_"..name](self, new);
	end

	local event = { room = self, fields = fields, changed = changed, stanza = stanza, origin = origin, update_option = handle_option };
	module:fire_event("muc-config-submitted", event);

	handle_option("name", "muc#roomconfig_roomname");
	handle_option("description", "muc#roomconfig_roomdesc");
	handle_option("persistent", "muc#roomconfig_persistentroom");
	handle_option("moderated", "muc#roomconfig_moderatedroom");
	handle_option("members_only", "muc#roomconfig_membersonly");
	handle_option("public", "muc#roomconfig_publicroom");
	handle_option("changesubject", "muc#roomconfig_changesubject");
	handle_option("historylength", "muc#roomconfig_historylength");
	handle_option("whois", "muc#roomconfig_whois", valid_whois);
	handle_option("password", "muc#roomconfig_roomsecret");

	if self.save then self:save(true); end
	if self:is_locked() then
		self:unlock();
	end
	origin.send(st.reply(stanza));

	if next(changed) then
		local msg = st.message({type='groupchat', from=self.jid})
			:tag('x', {xmlns='http://jabber.org/protocol/muc#user'}):up()
				:tag('status', {code = '104'}):up();
		if changed.whois then
			local code = (self:get_whois() == 'moderators') and "173" or "172";
			msg.tags[1]:tag('status', {code = code}):up();
		end
		self:broadcast_message(msg, false)
	end
end

function room_mt:destroy(newjid, reason, password)
	local pr = st.presence({type = "unavailable"})
		:tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})
			:tag("item", { affiliation='none', role='none' }):up()
			:tag("destroy", {jid=newjid})
	if reason then pr:tag("reason"):text(reason):up(); end
	if password then pr:tag("password"):text(password):up(); end
	for nick, occupant in pairs(self._occupants) do
		pr.attr.from = nick;
		for jid in pairs(occupant.sessions) do
			pr.attr.to = jid;
			self:_route_stanza(pr);
			self._jid_nick[jid] = nil;
		end
		self._occupants[nick] = nil;
		module:fire_event("muc-occupant-left", { room = self; nick = nick; });
	end
	self:set_persistent(false);
	module:fire_event("muc-room-destroyed", { room = self });
end

function room_mt:handle_disco_info_get_query(origin, stanza)
	origin.send(self:get_disco_info(stanza));
	return true;
end

function room_mt:handle_disco_items_get_query(origin, stanza)
	origin.send(self:get_disco_items(stanza));
	return true;
end

function room_mt:handle_admin_item_set_command(origin, stanza)
	local item = stanza.tags[1].tags[1];
	if item.attr.jid then -- Validate provided JID
		item.attr.jid = jid_prep(item.attr.jid);
		if not item.attr.jid then
			origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
			return true;
		end
	end
	if not item.attr.jid and item.attr.nick then -- COMPAT Workaround for Miranda sending 'nick' instead of 'jid' when changing affiliation
		local occupant = self._occupants[self.jid.."/"..item.attr.nick];
		if occupant then item.attr.jid = occupant.jid; end
	elseif not item.attr.nick and item.attr.jid then
		local nick = self:get_occupant_jid(item.attr.jid);
		if nick then item.attr.nick = select(3, jid_split(nick)); end
	end
	local actor = stanza.attr.from;
	local callback = function() origin.send(st.reply(stanza)); end
	local reason = item:get_child_text("reason");
	if item.attr.affiliation and item.attr.jid and not item.attr.role then
		local success, errtype, err = self:set_affiliation(actor, item.attr.jid, item.attr.affiliation, callback, reason);
		if not success then origin.send(st.error_reply(stanza, errtype, err)); end
		return true;
	elseif item.attr.role and item.attr.nick and not item.attr.affiliation then
		local success, errtype, err = self:set_role(actor, self.jid.."/"..item.attr.nick, item.attr.role, callback, reason);
		if not success then origin.send(st.error_reply(stanza, errtype, err)); end
		return true;
	else
		origin.send(st.error_reply(stanza, "cancel", "bad-request"));
		return true;
	end
end

function room_mt:handle_admin_item_get_command(origin, stanza)
	local actor = stanza.attr.from;
	local affiliation = self:get_affiliation(actor);
	local item = stanza.tags[1].tags[1];
	local _aff = item.attr.affiliation;
	local _rol = item.attr.role;
	if _aff and not _rol then
		if affiliation == "owner" or (affiliation == "admin" and _aff ~= "owner" and _aff ~= "admin") then
			local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
			for jid, affiliation in pairs(self._affiliations) do
				if affiliation == _aff then
					reply:tag("item", {affiliation = _aff, jid = jid}):up();
				end
			end
			origin.send(reply);
			return true;
		else
			origin.send(st.error_reply(stanza, "auth", "forbidden"));
			return true;
		end
	elseif _rol and not _aff then
		local role = self:get_role(self:get_occupant_jid(actor)) or self:get_default_role(affiliation);
		if role == "moderator" then
			if _rol == "none" then _rol = nil; end
			local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
			for occupant_jid, occupant in pairs(self._occupants) do
				if occupant.role == _rol then
					reply:tag("item", {
						nick = select(3, jid_split(occupant_jid)),
						role = _rol or "none",
						affiliation = occupant.affiliation or "none",
						jid = occupant.jid
						}):up();
				end
			end
			origin.send(reply);
			return true;
		else
			origin.send(st.error_reply(stanza, "auth", "forbidden"));
			return true;
		end
	else
		origin.send(st.error_reply(stanza, "cancel", "bad-request"));
		return true;
	end
end

function room_mt:handle_owner_query_get_to_room(origin, stanza)
	if self:get_affiliation(stanza.attr.from) ~= "owner" then
		origin.send(st.error_reply(stanza, "auth", "forbidden", "Only owners can configure rooms"));
		return true;
	end

	self:send_form(origin, stanza);
	return true;
end
function room_mt:handle_owner_query_set_to_room(origin, stanza)
	if self:get_affiliation(stanza.attr.from) ~= "owner" then
		origin.send(st.error_reply(stanza, "auth", "forbidden", "Only owners can configure rooms"));
		return true;
	end

	local child = stanza.tags[1].tags[1];
	if not child then
		origin.send(st.error_reply(stanza, "modify", "bad-request"));
		return true;
	elseif child.name == "destroy" then
		local newjid = child.attr.jid;
		local reason = child:get_child_text("reason");
		local password = child:get_child_text("password");
		self:destroy(newjid, reason, password);
		origin.send(st.reply(stanza));
		return true;
	else
		self:process_form(origin, stanza);
		return true;
	end
end

function room_mt:handle_groupchat_to_room(origin, stanza)
	local from = stanza.attr.from;
	local current_nick = self:get_occupant_jid(from);
	local occupant = self._occupants[current_nick];
	if not occupant then -- not in room
		origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
		return true;
	elseif occupant.role == "visitor" then
		origin.send(st.error_reply(stanza, "auth", "forbidden"));
		return true;
	else
		local from = stanza.attr.from;
		stanza.attr.from = current_nick;
		local subject = stanza:get_child_text("subject");
		if subject then
			if occupant.role == "moderator" or
				( self:get_changesubject() and occupant.role == "participant" ) then -- and participant
				self:set_subject(current_nick, subject);
			else
				stanza.attr.from = from;
				origin.send(st.error_reply(stanza, "auth", "forbidden"));
			end
		else
			self:broadcast_message(stanza, self:get_historylength() > 0 and stanza:get_child("body"));
		end
		stanza.attr.from = from;
		return true;
	end
end

-- hack - some buggy clients send presence updates to the room rather than their nick
function room_mt:handle_presence_to_room(origin, stanza)
	local current_nick = self:get_occupant_jid(stanza.attr.from);
	local handled
	if current_nick then
		local to = stanza.attr.to;
		stanza.attr.to = current_nick;
		handled = self:handle_presence_to_occupant(origin, stanza);
		stanza.attr.to = to;
	end
	return handled;
end

function room_mt:handle_mediated_invite(origin, stanza)
	local payload = stanza:get_child("x", "http://jabber.org/protocol/muc#user"):get_child("invite")
	local _from, _to = stanza.attr.from, stanza.attr.to;
	local current_nick = self:get_occupant_jid(_from)
	-- Need visitor role or higher to invite
	if not self:get_role(current_nick) or not self:get_default_role(self:get_affiliation(_from)) then
		origin.send(st.error_reply(stanza, "auth", "forbidden"));
		return true;
	end
	local _invitee = jid_prep(payload.attr.to);
	if _invitee then
		if self:get_whois() == "moderators" then
			_from = current_nick;
		end
		local _reason = payload:get_child_text("reason")
		local invite = st.message({from = _to, to = _invitee, id = stanza.attr.id})
			:tag('x', {xmlns='http://jabber.org/protocol/muc#user'})
				:tag('invite', {from=_from})
					:tag('reason'):text(_reason or ""):up()
				:up();
		local password = self:get_password()
		if password then
			invite:tag("password"):text(password):up();
		end
			invite:up()
			:tag('x', {xmlns="jabber:x:conference", jid=_to}) -- COMPAT: Some older clients expect this
				:text(_reason or "")
			:up()
			:tag('body') -- Add a plain message for clients which don't support invites
				:text(_from..' invited you to the room '.._to..(_reason and (' ('.._reason..')') or ""))
			:up();
		module:fire_event("muc-invite", { room = self, stanza = invite, origin = origin, incoming = stanza });
		return true;
	else
		origin.send(st.error_reply(stanza, "cancel", "jid-malformed"));
		return true;
	end
end

module:hook("muc-invite", function(event)
	event.room:_route_stanza(event.stanza);
	return true;
end, -1)

-- When an invite is sent; add an affiliation for the invitee
module:hook("muc-invite", function(event)
	local room, stanza = event.room, event.stanza
	local invitee = stanza.attr.to
	if room:get_members_only() and not room:get_affiliation(invitee) then
		local from = stanza:get_child("x", "http://jabber.org/protocol/muc#user"):get_child("invite").attr.from
		local current_nick = room:get_occupant_jid(from)
		log("debug", "%s invited %s into members only room %s, granting membership", from, invitee, room.jid);
		room:set_affiliation(from, invitee, "member", nil, "Invited by " .. current_nick)
	end
end)

function room_mt:handle_mediated_decline(origin, stanza)
	local payload = stanza:get_child("x", "http://jabber.org/protocol/muc#user"):get_child("decline")
	local declinee = jid_prep(payload.attr.to);
	if declinee then
		local from, to = stanza.attr.from, stanza.attr.to;
		-- TODO: Validate declinee
		local reason = payload:get_child_text("reason")
		local decline = st.message({from = to, to = declinee, id = stanza.attr.id})
			:tag('x', {xmlns='http://jabber.org/protocol/muc#user'})
				:tag('decline', {from=from})
					:tag('reason'):text(reason or ""):up()
				:up()
			:up()
			:tag('body') -- Add a plain message for clients which don't support declines
				:text(from..' declined your invite to the room '..to..(reason and (' ('..reason..')') or ""))
			:up();
		module:fire_event("muc-decline", { room = self, stanza = decline, origin = origin, incoming = stanza });
		return true;
	else
		origin.send(st.error_reply(stanza, "cancel", "jid-malformed"));
		return true;
	end
end

module:hook("muc-decline", function(event)
	event.room:_route_stanza(event.stanza);
	return true;
end, -1)

function room_mt:handle_message_to_room(origin, stanza)
	local type = stanza.attr.type;
	if type == "groupchat" then
		return self:handle_groupchat_to_room(origin, stanza)
	elseif type == "error" and is_kickable_error(stanza) then
		return self:handle_kickable(origin, stanza)
	elseif type == nil then
		local x = stanza:get_child("x", "http://jabber.org/protocol/muc#user");
		if x then
			local payload = x.tags[1];
			if payload == nil then
				-- fallthrough
			elseif payload.name == "invite" and payload.attr.to then
				return self:handle_mediated_invite(origin, stanza)
			elseif payload.name == "decline" and payload.attr.to then
				return self:handle_mediated_decline(origin, stanza)
			end
			origin.send(st.error_reply(stanza, "cancel", "bad-request"));
			return true;
		end
	else
		return nil;
	end
end

function room_mt:route_stanza(stanza)
	module:send(stanza)
end

function room_mt:get_affiliation(jid)
	local node, host, resource = jid_split(jid);
	local bare = node and node.."@"..host or host;
	local result = self._affiliations[bare]; -- Affiliations are granted, revoked, and maintained based on the user's bare JID.
	if not result and self._affiliations[host] == "outcast" then result = "outcast"; end -- host banned
	return result;
end
function room_mt:set_affiliation(actor, jid, affiliation, callback, reason)
	jid = jid_bare(jid);
	if affiliation == "none" then affiliation = nil; end
	if affiliation and affiliation ~= "outcast" and affiliation ~= "owner" and affiliation ~= "admin" and affiliation ~= "member" then
		return nil, "modify", "not-acceptable";
	end
	if actor ~= true then
		local actor_affiliation = self:get_affiliation(actor);
		local target_affiliation = self:get_affiliation(jid);
		if target_affiliation == affiliation then -- no change, shortcut
			if callback then callback(); end
			return true;
		end
		if actor_affiliation ~= "owner" then
			if affiliation == "owner" or affiliation == "admin" or actor_affiliation ~= "admin" or target_affiliation == "owner" or target_affiliation == "admin" then
				return nil, "cancel", "not-allowed";
			end
		elseif target_affiliation == "owner" and jid_bare(actor) == jid then -- self change
			local is_last = true;
			for j, aff in pairs(self._affiliations) do if j ~= jid and aff == "owner" then is_last = false; break; end end
			if is_last then
				return nil, "cancel", "conflict";
			end
		end
	end
	self._affiliations[jid] = affiliation;
	local role = self:get_default_role(affiliation);
	local x = st.stanza("x", {xmlns = "http://jabber.org/protocol/muc#user"})
			:tag("item", {affiliation=affiliation or "none", role=role or "none"})
				:tag("reason"):text(reason or ""):up()
			:up();
	local presence_type = nil;
	if not role then -- getting kicked
		presence_type = "unavailable";
		if affiliation == "outcast" then
			x:tag("status", {code="301"}):up(); -- banned
		else
			x:tag("status", {code="321"}):up(); -- affiliation change
		end
	end
	local modified_nicks = {};
	for nick, occupant in pairs(self._occupants) do
		if jid_bare(occupant.jid) == jid then
			if not role then -- getting kicked
				self._occupants[nick] = nil;
			else
				occupant.affiliation, occupant.role = affiliation, role;
			end
			for jid,pres in pairs(occupant.sessions) do -- remove for all sessions of the nick
				if not role then self._jid_nick[jid] = nil; end
				local p = st.clone(pres);
				p.attr.from = nick;
				p.attr.type = presence_type;
				p.attr.to = jid;
				p:add_child(x);
				self:_route_stanza(p);
				if occupant.jid == jid then
					modified_nicks[nick] = p;
				end
			end
		end
	end
	if self.save then self:save(); end
	if callback then callback(); end
	for nick,p in pairs(modified_nicks) do
		p.attr.from = nick;
		self:broadcast_except_nick(p, nick);
	end
	return true;
end

function room_mt:get_role(nick)
	local session = self._occupants[nick];
	return session and session.role or nil;
end
function room_mt:can_set_role(actor_jid, occupant_jid, role)
	local occupant = self._occupants[occupant_jid];
	if not occupant or not actor_jid then return nil, "modify", "not-acceptable"; end

	if actor_jid == true then return true; end

	local actor = self._occupants[self:get_occupant_jid(actor_jid)];
	if actor.role == "moderator" then
		if occupant.affiliation ~= "owner" and occupant.affiliation ~= "admin" then
			if actor.affiliation == "owner" or actor.affiliation == "admin" then
				return true;
			elseif occupant.role ~= "moderator" and role ~= "moderator" then
				return true;
			end
		end
	end
	return nil, "cancel", "not-allowed";
end
function room_mt:set_role(actor, occupant_jid, role, callback, reason)
	if role == "none" then role = nil; end
	if role and role ~= "moderator" and role ~= "participant" and role ~= "visitor" then return nil, "modify", "not-acceptable"; end
	local allowed, err_type, err_condition = self:can_set_role(actor, occupant_jid, role);
	if not allowed then return allowed, err_type, err_condition; end
	local occupant = self._occupants[occupant_jid];
	local x = st.stanza("x", {xmlns = "http://jabber.org/protocol/muc#user"})
			:tag("item", {affiliation=occupant.affiliation or "none", nick=select(3, jid_split(occupant_jid)), role=role or "none"})
				:tag("reason"):text(reason or ""):up()
			:up();
	local presence_type = nil;
	if not role then -- kick
		presence_type = "unavailable";
		self._occupants[occupant_jid] = nil;
		for jid in pairs(occupant.sessions) do -- remove for all sessions of the nick
			self._jid_nick[jid] = nil;
		end
		x:tag("status", {code = "307"}):up();
	else
		occupant.role = role;
	end
	local bp;
	for jid,pres in pairs(occupant.sessions) do -- send to all sessions of the nick
		local p = st.clone(pres);
		p.attr.from = occupant_jid;
		p.attr.type = presence_type;
		p.attr.to = jid;
		p:add_child(x);
		self:_route_stanza(p);
		if occupant.jid == jid then
			bp = p;
		end
	end
	if callback then callback(); end
	if bp then
		self:broadcast_except_nick(bp, occupant_jid);
	end
	return true;
end

function room_mt:_route_stanza(stanza)
	local muc_child;
	if stanza.name == "presence" then
		local to_occupant = self._occupants[self:get_occupant_jid(stanza.attr.to)];
		local from_occupant = self._occupants[stanza.attr.from];
		if to_occupant and from_occupant then
			if self:get_whois() == 'anyone' then
			    muc_child = stanza:get_child("x", "http://jabber.org/protocol/muc#user");
			else
				if to_occupant.role == "moderator" or jid_bare(to_occupant.jid) == jid_bare(from_occupant.jid) then
					muc_child = stanza:get_child("x", "http://jabber.org/protocol/muc#user");
				end
			end
		end
		if muc_child then
			for item in muc_child:childtags("item") do
				if from_occupant == to_occupant then
					item.attr.jid = stanza.attr.to;
				else
					item.attr.jid = from_occupant.jid;
				end
			end
		end
	end
	self:route_stanza(stanza);
	if muc_child then
		for item in muc_child:childtags("item") do
			item.attr.jid = nil;
		end
	end
end

local _M = {}; -- module "muc"

function _M.new_room(jid, config)
	return setmetatable({
		jid = jid;
		locked = nil;
		_jid_nick = {};
		_occupants = {};
		_data = {
		    whois = 'moderators';
		    history_length = math.min((config and config.history_length)
		    	or default_history_length, max_history_length);
		};
		_affiliations = {};
	}, room_mt);
end

function _M.set_max_history_length(_max_history_length)
	max_history_length = _max_history_length or math.huge;
end

_M.room_mt = room_mt;

return _M;