aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/muc/muc.lib.lua
blob: e679f9fe6bb9b3b7ecbd5e527103e5402f944bd2 (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
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
-- 
-- 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 datamanager = require "util.datamanager";
local datetime = require "util.datetime";

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 multitable_new = require "util.multitable".new;
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 muc_domain = nil; --module:get_host();
local default_history_length = 20;

------------
local function filter_xmlns_from_array(array, filters)
	local count = 0;
	for i=#array,1,-1 do
		local attr = array[i].attr;
		if filters[attr and attr.xmlns] then
			t_remove(array, i);
			count = count + 1;
		end
	end
	return count;
end
local function filter_xmlns_from_stanza(stanza, filters)
	if filters then
		if filter_xmlns_from_array(stanza.tags, filters) ~= 0 then
			return stanza, filter_xmlns_from_array(stanza, filters);
		end
	end
	return stanza, 0;
end
local presence_filters = {["http://jabber.org/protocol/muc"]=true;["http://jabber.org/protocol/muc#user"]=true};
local function get_filtered_presence(stanza)
	return filter_xmlns_from_stanza(st.clone(stanza):reset(), presence_filters);
end
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;
};

local function get_error_condition(stanza)
	local _, condition = stanza:get_error();
	return condition or "malformed error";
end

local function is_kickable_error(stanza)
	local cond = get_error_condition(stanza);
	return kickable_error_conditions[cond] and cond;
end
local function getUsingPath(stanza, path, getText)
	local tag = stanza;
	for _, name in ipairs(path) do
		if type(tag) ~= 'table' then return; end
		tag = tag:child_with_name(name);
	end
	if tag and getText then tag = table.concat(tag); end
	return tag;
end
local function getTag(stanza, path) return getUsingPath(stanza, path); end
local function getText(stanza, path) return getUsingPath(stanza, path, true); end
-----------

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

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:is_members_only() then
			return self:is_moderated() and "visitor" or "participant";
		end
	end
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'});
		stanza.attr.to = sid;
		self:_route_stanza(stanza);
	end
end
function room_mt:broadcast_message(stanza, historic)
	local to = stanza.attr.to;
	for occupant, o_data in pairs(self._occupants) do
		for jid in pairs(o_data.sessions) do
			stanza.attr.to = jid;
			self:_route_stanza(stanza);
		end
	end
	stanza.attr.to = to;
	if historic then -- add to history
		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();
		local chars = #tostring(stanza);
		stanza:tag("delay", {xmlns = "urn:xmpp:delay", from = muc_domain, stamp = stamp}):up(); -- XEP-0203
		stanza:tag("x", {xmlns = "jabber:x:delay", from = muc_domain, 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
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._jid_nick[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
function room_mt:send_history(to, stanza)
	local history = self._data['history']; -- send discussion history
	if history then
		local x_tag = stanza and 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");
		
		local maxchars = history_tag and tonumber(history_tag.attr.maxchars);
		if maxchars then maxchars = math.floor(maxchars); end
		
		local maxstanzas = math.floor(history_tag and tonumber(history_tag.attr.maxstanzas) or #history);
		if not history_tag then maxstanzas = 20; end

		local seconds = history_tag and tonumber(history_tag.attr.seconds);
		if seconds then seconds = datetime.datetime(os.time() - math.floor(seconds)); end

		local since = history_tag and history_tag.attr.since;
		if since and not since:match("^%d%d%d%d%-%d%d%-%d%dT%d%d:%d%d:%d%dZ$") then since = nil; end -- FIXME timezone support
		if seconds and (not since or since < seconds) then since = seconds; end

		local n = 0;
		local charcount = 0;
		local stanzacount = 0;
		
		for i=#history,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
		for i=#history-n+1,#history do
			local msg = history[i].stanza;
			msg.attr.to = to;
			self:_route_stanza(msg);
		end
	end
	if self._data['subject'] then
		self:_route_stanza(st.message({type='groupchat', from=self.jid, to=to}):tag("subject"):text(self._data['subject']));
	end
end

function room_mt:get_disco_info(stanza)
	return st.reply(stanza):query("http://jabber.org/protocol/disco#info")
		:tag("identity", {category="conference", type="text"}):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:is_moderated() and "muc_moderated" or "muc_unmoderated"}):up()
		:tag("feature", {var=self:is_members_only() and "muc_membersonly" or "muc_open"}):up()
		:tag("feature", {var=self:is_persistent() and "muc_persistent" or "muc_temporary"}):up()
		:tag("feature", {var=self:is_hidden() and "muc_hidden" or "muc_public"}):up()
		:tag("feature", {var=self._data.whois ~= "anyone" and "muc_semianonymous" or "muc_nonanonymous"}):up()
	;
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)
	-- TODO check nick's authority
	if subject == "" then subject = nil; end
	self._data['subject'] = subject;
	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

local function build_unavailable_presence_from_error(stanza)
	local type, condition, text = stanza:get_error();
	local error_message = "Kicked: "..condition:gsub("%-", " ");
	if text then
		error_message = error_message..": "..text;
	end
	return st.presence({type='unavailable', from=stanza.attr.from, to=stanza.attr.to})
		:tag('status'):text(error_message);
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:is_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:is_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:is_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:is_hidden()
	return self._data.hidden;
end

function room_mt:handle_to_occupant(origin, stanza) -- PM, vCards, etc
	local from, to = stanza.attr.from, stanza.attr.to;
	local room = jid_bare(to);
	local current_nick = self._jid_nick[from];
	local type = stanza.attr.type;
	log("debug", "room: %s, current_nick: %s, stanza: %s", room or "nil", current_nick or "nil", stanza:top_tag());
	if (select(2, jid_split(from)) == muc_domain) then error("Presence from the MUC itself!!!"); end
	if stanza.name == "presence" then
		local pr = get_filtered_presence(stanza);
		pr.attr.from = current_nick;
		if type == "error" then -- error, kick em out!
			if current_nick then
				log("debug", "kicking %s from %s", current_nick, room);
				self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza));
			end
		elseif type == "unavailable" then -- unavailable
			if current_nick then
				log("debug", "%s leaving %s", current_nick, room);
				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'});
					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;
				end
				self._jid_nick[from] = nil;
			end
		elseif not type then -- available
			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
						log("debug", "%s broadcasted presence", current_nick);
						self._occupants[current_nick].sessions[from] = pr;
						self:broadcast_presence(pr, from);
					else -- change nick
						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"}));
						else
							local data = self._occupants[current_nick];
							local to_nick = select(3, jid_split(to));
							if to_nick then
								log("debug", "%s (%s) changing nick to %s", current_nick, data.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] = data;
								self._jid_nick[from] = to;
								pr.attr.from = to;
								self._occupants[to].sessions[from] = pr;
								self:broadcast_presence(pr, from);
							else
								--TODO malformed-jid
							end
						end
					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;
				local is_merge;
				if self._occupants[to] then
					if jid_bare(from) ~= jid_bare(self._occupants[to].jid) then
						new_nick = nil;
					end
					is_merge = true;
				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"}));
				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"}));
				else
					log("debug", "%s joining as %s", from, to);
					if not next(self._affiliations) then -- new room, no owners
						self._affiliations[jid_bare(from)] = "owner";
					end
					local affiliation = self:get_affiliation(from);
					local role = self:get_default_role(affiliation)
					if role then -- new occupant
						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);
						pr.attr.from = to;
						if not is_merge then
							self:broadcast_presence(pr, from);
						else
							pr.attr.to = from;
							self:_route_stanza(pr:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
								:tag("item", {affiliation=affiliation or "none", role=role or "none"}):up()
								:tag("status", {code='110'}));
						end
						self:send_history(from, stanza);
					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"}));
					end
				end
			end
		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
	elseif not current_nick then -- not in room
		if type == "error" or type == "result" then
			local id = stanza.name == "iq" and stanza.attr.id and base64.decode(stanza.attr.id);
			local _nick, _id, _hash = (id or ""):match("^(.+)%z(.*)%z(.+)$");
			local occupant = self._occupants[stanza.attr.to];
			if occupant and _nick and self._jid_nick[_nick] and _id and _hash then
				local id, _to = stanza.attr.id;
				for jid in pairs(occupant.sessions) do
					if md5(jid) == _hash then
						_to = jid;
						break;
					end
				end
				if _to then
					stanza.attr.to, stanza.attr.from, stanza.attr.id = _to, self._jid_nick[_nick], _id;
					self:_route_stanza(stanza);
					stanza.attr.to, stanza.attr.from, stanza.attr.id = to, from, id;
				end
			end
		else
			origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
		end
	elseif stanza.name == "message" and type == "groupchat" then -- groupchat messages not allowed in PM
		origin.send(st.error_reply(stanza, "modify", "bad-request"));
	elseif current_nick and stanza.name == "message" and type == "error" and is_kickable_error(stanza) then
		log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
		self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza)); -- send unavailable
	else -- private stanza
		local o_data = self._occupants[to];
		if o_data then
			log("debug", "%s sent private stanza to %s (%s)", from, to, o_data.jid);
			local jid = o_data.jid;
			local bare = jid_bare(jid);
			stanza.attr.to, stanza.attr.from = jid, current_nick;
			local id = stanza.attr.id;
			if stanza.name=='iq' and type=='get' and stanza.tags[1].attr.xmlns == 'vcard-temp' and bare ~= jid then
				stanza.attr.to = bare;
				stanza.attr.id = base64.encode(jid.."\0"..id.."\0"..md5(from));
			end
			self:_route_stanza(stanza);
			stanza.attr.to, stanza.attr.from, stanza.attr.id = to, from, id;
		elseif type ~= "error" and type ~= "result" then -- recipient not in room
			origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Recipient not in room"));
		end
	end
end

function room_mt:send_form(origin, stanza)
	local title = "Configuration for "..self.jid;
	origin.send(st.reply(stanza):query("http://jabber.org/protocol/muc#owner")
		:tag("x", {xmlns='jabber:x:data', type='form'})
			:tag("title"):text(title):up()
			:tag("instructions"):text(title):up()
			:tag("field", {type='hidden', var='FORM_TYPE'}):tag("value"):text("http://jabber.org/protocol/muc#roomconfig"):up():up()
			:tag("field", {type='boolean', label='Make Room Persistent?', var='muc#roomconfig_persistentroom'})
				:tag("value"):text(self:is_persistent() and "1" or "0"):up()
			:up()
			:tag("field", {type='boolean', label='Make Room Publicly Searchable?', var='muc#roomconfig_publicroom'})
				:tag("value"):text(self:is_hidden() and "0" or "1"):up()
			:up()
			:tag("field", {type='list-single', label='Who May Discover Real JIDs?', var='muc#roomconfig_whois'})
			    :tag("value"):text(self._data.whois or 'moderators'):up()
			    :tag("option", {label = 'Moderators Only'})
				:tag("value"):text('moderators'):up()
				:up()
			    :tag("option", {label = 'Anyone'})
				:tag("value"):text('anyone'):up()
				:up()
			:up()
			:tag("field", {type='text-private', label='Password', var='muc#roomconfig_roomsecret'})
				:tag("value"):text(self:get_password() or ""):up()
			:up()
			:tag("field", {type='boolean', label='Make Room Moderated?', var='muc#roomconfig_moderatedroom'})
				:tag("value"):text(self:is_moderated() and "1" or "0"):up()
			:up()
			:tag("field", {type='boolean', label='Make Room Members-Only?', var='muc#roomconfig_membersonly'})
				:tag("value"):text(self:is_members_only() and "1" or "0"):up()
			:up()
	);
end

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

function room_mt:process_form(origin, stanza)
	local query = stanza.tags[1];
	local form;
	for _, tag in ipairs(query.tags) do if tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then form = tag; break; end end
	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")); return; end
	local fields = {};
	for _, field in pairs(form.tags) do
		if field.name == "field" and field.attr.var and field.tags[1].name == "value" and #field.tags[1].tags == 0 then
			fields[field.attr.var] = field.tags[1][1] or "";
		end
	end
	if fields.FORM_TYPE ~= "http://jabber.org/protocol/muc#roomconfig" then origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end

	local dirty = false

	local persistent = fields['muc#roomconfig_persistentroom'];
	if persistent == "0" or persistent == "false" then persistent = nil; elseif persistent == "1" or persistent == "true" then persistent = true;
	else origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
	dirty = dirty or (self:is_persistent() ~= persistent)
	module:log("debug", "persistent=%s", tostring(persistent));

	local moderated = fields['muc#roomconfig_moderatedroom'];
	if moderated == "0" or moderated == "false" then moderated = nil; elseif moderated == "1" or moderated == "true" then moderated = true;
	else origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
	dirty = dirty or (self:is_moderated() ~= moderated)
	module:log("debug", "moderated=%s", tostring(moderated));

	local membersonly = fields['muc#roomconfig_membersonly'];
	if membersonly == "0" or membersonly == "false" then membersonly = nil; elseif membersonly == "1" or membersonly == "true" then membersonly = true;
	else origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
	dirty = dirty or (self:is_members_only() ~= membersonly)
	module:log("debug", "membersonly=%s", tostring(membersonly));

	local public = fields['muc#roomconfig_publicroom'];
	if public == "0" or public == "false" then public = nil; elseif public == "1" or public == "true" then public = true;
	else origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
	dirty = dirty or (self:is_hidden() ~= (not public and true or nil))

	local whois = fields['muc#roomconfig_whois'];
	if not valid_whois[whois] then
	    origin.send(st.error_reply(stanza, 'cancel', 'bad-request'));
	    return;
	end
	local whois_changed = self._data.whois ~= whois
	self._data.whois = whois
	module:log('debug', 'whois=%s', whois)

	local password = fields['muc#roomconfig_roomsecret'];
	if password then
		self:set_password(password);
	end
	self:set_moderated(moderated);
	self:set_members_only(membersonly);
	self:set_persistent(persistent);
	self:set_hidden(not public);

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

	if dirty or whois_changed then
	    local msg = st.message({type='groupchat', from=self.jid})
		    :tag('x', {xmlns='http://jabber.org/protocol/muc#user'}):up()

	    if dirty then
		msg.tags[1]:tag('status', {code = '104'})
	    end
	    if whois_changed then
		local code = (whois == 'moderators') and 173 or 172
		msg.tags[1]:tag('status', {code = code})
	    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;
	end
	self:set_persistent(false);
end

function room_mt:handle_to_room(origin, stanza) -- presence changes and groupchat messages, along with disco/etc
	local type = stanza.attr.type;
	local xmlns = stanza.tags[1] and stanza.tags[1].attr.xmlns;
	if stanza.name == "iq" then
		if xmlns == "http://jabber.org/protocol/disco#info" and type == "get" then
			origin.send(self:get_disco_info(stanza));
		elseif xmlns == "http://jabber.org/protocol/disco#items" and type == "get" then
			origin.send(self:get_disco_items(stanza));
		elseif xmlns == "http://jabber.org/protocol/muc#admin" then
			local actor = stanza.attr.from;
			local affiliation = self:get_affiliation(actor);
			local current_nick = self._jid_nick[actor];
			local role = current_nick and self._occupants[current_nick].role or self:get_default_role(affiliation);
			local item = stanza.tags[1].tags[1];
			if item and item.name == "item" then
				if type == "set" then
					local callback = function() origin.send(st.reply(stanza)); end
					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;
						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._jid_nick[item.attr.jid];
						if nick then item.attr.nick = select(3, jid_split(nick)); end
					end
					local reason = item.tags[1] and item.tags[1].name == "reason" and #item.tags[1] == 1 and item.tags[1][1];
					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
					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
					else
						origin.send(st.error_reply(stanza, "cancel", "bad-request"));
					end
				elseif type == "get" then
					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);
						else
							origin.send(st.error_reply(stanza, "auth", "forbidden"));
						end
					elseif _rol and not _aff then
						if role == "moderator" then
							-- TODO allow admins and owners not in room? Provide read-only access to everyone who can see the participants anyway?
							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);
						else
							origin.send(st.error_reply(stanza, "auth", "forbidden"));
						end
					else
						origin.send(st.error_reply(stanza, "cancel", "bad-request"));
					end
				end
			elseif type == "set" or type == "get" then
				origin.send(st.error_reply(stanza, "cancel", "bad-request"));
			end
		elseif xmlns == "http://jabber.org/protocol/muc#owner" and (type == "get" or type == "set") and stanza.tags[1].name == "query" then
			if self:get_affiliation(stanza.attr.from) ~= "owner" then
				origin.send(st.error_reply(stanza, "auth", "forbidden"));
			elseif stanza.attr.type == "get" then
				self:send_form(origin, stanza);
			elseif stanza.attr.type == "set" then
				local child = stanza.tags[1].tags[1];
				if not child then
					origin.send(st.error_reply(stanza, "auth", "bad-request"));
				elseif child.name == "destroy" then
					local newjid = child.attr.jid;
					local reason, password;
					for _,tag in ipairs(child.tags) do
						if tag.name == "reason" then
							reason = #tag.tags == 0 and tag[1];
						elseif tag.name == "password" then
							password = #tag.tags == 0 and tag[1];
						end
					end
					self:destroy(newjid, reason, password);
					origin.send(st.reply(stanza));
				else
					self:process_form(origin, stanza);
				end
			end
		elseif type == "set" or type == "get" then
			origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
		end
	elseif stanza.name == "message" and type == "groupchat" then
		local from, to = stanza.attr.from, stanza.attr.to;
		local room = jid_bare(to);
		local current_nick = self._jid_nick[from];
		local occupant = self._occupants[current_nick];
		if not occupant then -- not in room
			origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
		elseif occupant.role == "visitor" then
			origin.send(st.error_reply(stanza, "cancel", "forbidden"));
		else
			local from = stanza.attr.from;
			stanza.attr.from = current_nick;
			local subject = getText(stanza, {"subject"});
			if subject then
				if occupant.role == "moderator" then
					self:set_subject(current_nick, subject); -- TODO use broadcast_message_stanza
				else
					stanza.attr.from = from;
					origin.send(st.error_reply(stanza, "cancel", "forbidden"));
				end
			else
				self:broadcast_message(stanza, true);
			end
			stanza.attr.from = from;
		end
	elseif stanza.name == "message" and type == "error" and is_kickable_error(stanza) then
		local current_nick = self._jid_nick[stanza.attr.from];
		log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
		self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza)); -- send unavailable
	elseif stanza.name == "presence" then -- hack - some buggy clients send presence updates to the room rather than their nick
		local to = stanza.attr.to;
		local current_nick = self._jid_nick[stanza.attr.from];
		if current_nick then
			stanza.attr.to = current_nick;
			self:handle_to_occupant(origin, stanza);
			stanza.attr.to = to;
		elseif type ~= "error" and type ~= "result" then
			origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
		end
	elseif stanza.name == "message" and not stanza.attr.type and #stanza.tags == 1 and self._jid_nick[stanza.attr.from]
		and stanza.tags[1].name == "x" and stanza.tags[1].attr.xmlns == "http://jabber.org/protocol/muc#user" then
		local x = stanza.tags[1];
		local payload = (#x.tags == 1 and x.tags[1]);
		if payload and payload.name == "invite" and payload.attr.to then
			local _from, _to = stanza.attr.from, stanza.attr.to;
			local _invitee = jid_prep(payload.attr.to);
			if _invitee then
				local _reason = payload.tags[1] and payload.tags[1].name == 'reason' and #payload.tags[1].tags == 0 and payload.tags[1][1];
				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();
						if self:get_password() then
							invite:tag("password"):text(self:get_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();
				self:_route_stanza(invite);
			else
				origin.send(st.error_reply(stanza, "cancel", "jid-malformed"));
			end
		else
			origin.send(st.error_reply(stanza, "cancel", "bad-request"));
		end
	else
		if type == "error" or type == "result" then return; end
		origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
	end
end

function room_mt:handle_stanza(origin, stanza)
	local to_node, to_host, to_resource = jid_split(stanza.attr.to);
	if to_resource then
		self:handle_to_occupant(origin, stanza);
	else
		self:handle_to_room(origin, stanza);
	end
end

function room_mt:route_stanza(stanza) end -- Replace with a routing function, e.g., function(room, stanza) core_route_stanza(origin, 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 self:get_affiliation(actor) ~= "owner" then return nil, "cancel", "not-allowed"; end
	if jid_bare(actor) == jid then return nil, "cancel", "not-allowed"; end
	self._affiliations[jid] = affiliation;
	local role = self:get_default_role(affiliation);
	local p = st.presence()
		:tag("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 x = p.tags[1];
	local item = x.tags[1];
	if not role then -- getting kicked
		p.attr.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
				t_insert(modified_nicks, nick);
				occupant.affiliation, occupant.role = affiliation, role;
			end
			p.attr.from = nick;
			for jid in pairs(occupant.sessions) do -- remove for all sessions of the nick
				if not role then self._jid_nick[jid] = nil; end
				p.attr.to = jid;
				self:_route_stanza(p);
			end
		end
	end
	if self.save then self:save(); end
	if callback then callback(); end
	for _, nick in ipairs(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 actor = self._occupants[self._jid_nick[actor_jid]];
	local occupant = self._occupants[occupant_jid];
	
	if not occupant or not actor then return nil, "modify", "not-acceptable"; end

	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 p = st.presence({from = occupant_jid})
		:tag("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();
	if not role then -- kick
		p.attr.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
		p:tag("status", {code = "307"}):up();
	else
		occupant.role = role;
	end
	for jid in pairs(occupant.sessions) do -- send to all sessions of the nick
		p.attr.to = jid;
		self:_route_stanza(p);
	end
	if callback then callback(); end
	self:broadcast_except_nick(p, occupant_jid);
	return true;
end

function room_mt:_route_stanza(stanza)
	local muc_child;
	local to_occupant = self._occupants[self._jid_nick[stanza.attr.to]];
	local from_occupant = self._occupants[stanza.attr.from];
	if stanza.name == "presence" then
		if to_occupant and from_occupant then
			if self._data.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
	end
	if muc_child then
		for _, item in pairs(muc_child.tags) do
			if item.name == "item" then
				if from_occupant == to_occupant then
					item.attr.jid = stanza.attr.to;
				else
					item.attr.jid = from_occupant.jid;
				end
			end
		end
		if self._data.whois == 'anyone' then
		    muc_child:tag('status', { code = '100' });
		end
	end
	self:route_stanza(stanza);
	if muc_child then
		for _, item in pairs(muc_child.tags) do
			if item.name == "item" then
				item.attr.jid = nil;
			end
		end
	end
end

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

function _M.new_room(jid, config)
	return setmetatable({
		jid = jid;
		_jid_nick = {};
		_occupants = {};
		_data = {
		    whois = 'moderators';
		    history_length = (config and config.history_length);
		};
		_affiliations = {};
	}, room_mt);
end

return _M;