plugins/muc/muc.lib.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 -- Copyright (C) 2014 Daurnimator
   5 --
   6 -- This project is MIT/X11 licensed. Please see the
   7 -- COPYING file in the source package for more information.
   8 --
   9
  10 local select = select;
  11 local pairs, ipairs = pairs, ipairs;
  12
  13 local gettime = os.time;
  14 local datetime = require "util.datetime";
  15
  16 local dataform = require "util.dataforms";
  17
  18 local jid_split = require "util.jid".split;
  19 local jid_bare = require "util.jid".bare;
  20 local jid_prep = require "util.jid".prep;
  21 local st = require "util.stanza";
  22 local log = require "util.logger".init("mod_muc");
  23 local t_insert, t_remove = table.insert, table.remove;
  24 local setmetatable = setmetatable;
  25 local base64 = require "util.encodings".base64;
  26 local md5 = require "util.hashes".md5;
  27
  28 local default_history_length, max_history_length = 20, math.huge;
  29
  30 local get_filtered_presence do
  31         local presence_filters = {
  32                 ["http://jabber.org/protocol/muc"] = true;
  33                 ["http://jabber.org/protocol/muc#user"] = true;
  34         }
  35         local function presence_filter(tag)
  36                 if presence_filters[tag.attr.xmlns] then
  37                         return nil;
  38                 end
  39                 return tag;
  40         end
  41         function get_filtered_presence(stanza)
  42                 return st.clone(stanza):maptags(presence_filter);
  43         end
  44 end
  45
  46 local is_kickable_error do
  47         local kickable_error_conditions = {
  48                 ["gone"] = true;
  49                 ["internal-server-error"] = true;
  50                 ["item-not-found"] = true;
  51                 ["jid-malformed"] = true;
  52                 ["recipient-unavailable"] = true;
  53                 ["redirect"] = true;
  54                 ["remote-server-not-found"] = true;
  55                 ["remote-server-timeout"] = true;
  56                 ["service-unavailable"] = true;
  57                 ["malformed error"] = true;
  58         };
  59         function is_kickable_error(stanza)
  60                 local cond = select(2, stanza:get_error()) or "malformed error";
  61                 return kickable_error_conditions[cond];
  62         end
  63 end
  64
  65 local room_mt = {};
  66 room_mt.__index = room_mt;
  67
  68 function room_mt:__tostring()
  69         return "MUC room ("..self.jid..")";
  70 end
  71
  72 function room_mt:get_occupant_jid(real_jid)
  73         return self._jid_nick[real_jid]
  74 end
  75
  76 function room_mt:get_default_role(affiliation)
  77         if affiliation == "owner" or affiliation == "admin" then
  78                 return "moderator";
  79         elseif affiliation == "member" then
  80                 return "participant";
  81         elseif not affiliation then
  82                 if not self:get_members_only() then
  83                         return self:get_moderated() and "visitor" or "participant";
  84                 end
  85         end
  86 end
  87
  88 function room_mt:lock()
  89         self.locked = true
  90 end
  91 function room_mt:unlock()
  92         module:fire_event("muc-room-unlocked", { room = self });
  93         self.locked = nil
  94 end
  95 function room_mt:is_locked()
  96         return not not self.locked
  97 end
  98
  99 function room_mt:route_to_occupant(o_data, stanza)
 100         local to = stanza.attr.to;
 101         for jid in pairs(o_data.sessions) do
 102                 stanza.attr.to = jid;
 103                 self:_route_stanza(stanza);
 104         end
 105         stanza.attr.to = to;
 106 end
 107
 108 function room_mt:broadcast_presence(stanza, sid, code, nick)
 109         stanza = get_filtered_presence(stanza);
 110         local occupant = self._occupants[stanza.attr.from];
 111         stanza:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 112                 :tag("item", {affiliation=occupant.affiliation or "none", role=occupant.role or "none", nick=nick}):up();
 113         if code then
 114                 stanza:tag("status", {code=code}):up();
 115         end
 116         self:broadcast_except_nick(stanza, stanza.attr.from);
 117         stanza:tag("status", {code='110'}):up();
 118         stanza.attr.to = sid;
 119         self:_route_stanza(stanza);
 120 end
 121 function room_mt:broadcast_message(stanza, historic)
 122         for occupant_jid, o_data in pairs(self._occupants) do
 123                 self:route_to_occupant(o_data, stanza)
 124         end
 125         if historic then -- add to history
 126                 return self:save_to_history(stanza)
 127         end
 128 end
 129 function room_mt:save_to_history(stanza)
 130         local history = self._data['history'];
 131         if not history then history = {}; self._data['history'] = history; end
 132         stanza = st.clone(stanza);
 133         stanza.attr.to = "";
 134         local stamp = datetime.datetime();
 135         stanza:tag("delay", {xmlns = "urn:xmpp:delay", from = module.host, stamp = stamp}):up(); -- XEP-0203
 136         stanza:tag("x", {xmlns = "jabber:x:delay", from = module.host, stamp = datetime.legacy()}):up(); -- XEP-0091 (deprecated)
 137         local entry = { stanza = stanza, stamp = stamp };
 138         t_insert(history, entry);
 139         while #history > (self._data.history_length or default_history_length) do t_remove(history, 1) end
 140 end
 141 function room_mt:broadcast_except_nick(stanza, nick)
 142         for rnick, occupant in pairs(self._occupants) do
 143                 if rnick ~= nick then
 144                         self:route_to_occupant(occupant, stanza)
 145                 end
 146         end
 147 end
 148
 149 function room_mt:send_occupant_list(to)
 150         local current_nick = self:get_occupant_jid(to);
 151         for occupant, o_data in pairs(self._occupants) do
 152                 if occupant ~= current_nick then
 153                         local pres = get_filtered_presence(o_data.sessions[o_data.jid]);
 154                         pres.attr.to, pres.attr.from = to, occupant;
 155                         pres:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 156                                 :tag("item", {affiliation=o_data.affiliation or "none", role=o_data.role or "none"}):up();
 157                         self:_route_stanza(pres);
 158                 end
 159         end
 160 end
 161
 162 local function parse_history(stanza)
 163         local x_tag = stanza:get_child("x", "http://jabber.org/protocol/muc");
 164         local history_tag = x_tag and x_tag:get_child("history", "http://jabber.org/protocol/muc");
 165         if not history_tag then
 166                 return nil, 20, nil
 167         end
 168
 169         local maxchars = tonumber(history_tag.attr.maxchars);
 170
 171         local maxstanzas = tonumber(history_tag.attr.maxstanzas);
 172
 173         -- messages received since the UTC datetime specified
 174         local since = history_tag.attr.since;
 175         if since then
 176                 since = datetime.parse(since);
 177         end
 178
 179         -- messages received in the last "X" seconds.
 180         local seconds = tonumber(history_tag.attr.seconds);
 181         if seconds then
 182                 seconds = gettime() - seconds
 183                 if since then
 184                         since = math.max(since, seconds);
 185                 else
 186                         since = seconds;
 187                 end
 188         end
 189
 190         return maxchars, maxstanzas, since
 191 end
 192 -- Get history for 'to'
 193 function room_mt:get_history(to, maxchars, maxstanzas, since)
 194         local history = self._data['history']; -- send discussion history
 195         if not history then return function() end end
 196         local history_len = #history
 197
 198         maxstanzas = maxstanzas or history_len
 199         local n = 0;
 200         local charcount = 0;
 201         for i=history_len,1,-1 do
 202                 local entry = history[i];
 203                 if maxchars then
 204                         if not entry.chars then
 205                                 entry.stanza.attr.to = "";
 206                                 entry.chars = #tostring(entry.stanza);
 207                         end
 208                         charcount = charcount + entry.chars + #to;
 209                         if charcount > maxchars then break; end
 210                 end
 211                 if since and since > entry.stamp then break; end
 212                 if n + 1 > maxstanzas then break; end
 213                 n = n + 1;
 214         end
 215
 216         local i = history_len-n+1
 217         return function()
 218                 if i > history_len then return nil end
 219                 local entry = history[i]
 220                 local msg = entry.stanza
 221                 msg.attr.to = to;
 222                 i = i + 1
 223                 return msg
 224         end
 225 end
 226 function room_mt:send_history(to, stanza)
 227         local maxchars, maxstanzas, since = parse_history(stanza)
 228         for msg in self:get_history(to, maxchars, maxstanzas, since) do
 229                 self:_route_stanza(msg);
 230         end
 231 end
 232 function room_mt:send_subject(to)
 233         if self._data['subject'] then
 234                 self:_route_stanza(st.message({type='groupchat', from=self._data['subject_from'] or self.jid, to=to}):tag("subject"):text(self._data['subject']));
 235         end
 236 end
 237
 238 function room_mt:get_disco_info(stanza)
 239         local count = 0; for _ in pairs(self._occupants) do count = count + 1; end
 240         return st.reply(stanza):query("http://jabber.org/protocol/disco#info")
 241                 :tag("identity", {category="conference", type="text", name=self:get_name()}):up()
 242                 :tag("feature", {var="http://jabber.org/protocol/muc"}):up()
 243                 :tag("feature", {var=self:get_password() and "muc_passwordprotected" or "muc_unsecured"}):up()
 244                 :tag("feature", {var=self:get_moderated() and "muc_moderated" or "muc_unmoderated"}):up()
 245                 :tag("feature", {var=self:get_members_only() and "muc_membersonly" or "muc_open"}):up()
 246                 :tag("feature", {var=self:get_persistent() and "muc_persistent" or "muc_temporary"}):up()
 247                 :tag("feature", {var=self:get_hidden() and "muc_hidden" or "muc_public"}):up()
 248                 :tag("feature", {var=self:get_whois() ~= "anyone" and "muc_semianonymous" or "muc_nonanonymous"}):up()
 249                 :add_child(dataform.new({
 250                         { name = "FORM_TYPE", type = "hidden", value = "http://jabber.org/protocol/muc#roominfo" },
 251                         { name = "muc#roominfo_description", label = "Description", value = "" },
 252                         { name = "muc#roominfo_occupants", label = "Number of occupants", value = tostring(count) }
 253                 }):form({["muc#roominfo_description"] = self:get_description()}, 'result'))
 254         ;
 255 end
 256 function room_mt:get_disco_items(stanza)
 257         local reply = st.reply(stanza):query("http://jabber.org/protocol/disco#items");
 258         for room_jid in pairs(self._occupants) do
 259                 reply:tag("item", {jid = room_jid, name = room_jid:match("/(.*)")}):up();
 260         end
 261         return reply;
 262 end
 263 function room_mt:set_subject(current_nick, subject)
 264         if subject == "" then subject = nil; end
 265         self._data['subject'] = subject;
 266         self._data['subject_from'] = current_nick;
 267         if self.save then self:save(); end
 268         local msg = st.message({type='groupchat', from=current_nick})
 269                 :tag('subject'):text(subject):up();
 270         self:broadcast_message(msg, false);
 271         return true;
 272 end
 273
 274 function room_mt:handle_kickable(origin, stanza)
 275         local type, condition, text = stanza:get_error();
 276         local error_message = "Kicked: "..(condition and condition:gsub("%-", " ") or "presence error");
 277         if text then
 278                 error_message = error_message..": "..text;
 279         end
 280         local kick_stanza = st.presence({type='unavailable', from=stanza.attr.from, to=stanza.attr.to})
 281                 :tag('status'):text(error_message);
 282         self:handle_unavailable_to_occupant(origin, kick_stanza); -- send unavailable
 283         return true;
 284 end
 285
 286 function room_mt:set_name(name)
 287         if name == "" or type(name) ~= "string" or name == (jid_split(self.jid)) then name = nil; end
 288         if self._data.name ~= name then
 289                 self._data.name = name;
 290                 if self.save then self:save(true); end
 291         end
 292 end
 293 function room_mt:get_name()
 294         return self._data.name or jid_split(self.jid);
 295 end
 296 function room_mt:set_description(description)
 297         if description == "" or type(description) ~= "string" then description = nil; end
 298         if self._data.description ~= description then
 299                 self._data.description = description;
 300                 if self.save then self:save(true); end
 301         end
 302 end
 303 function room_mt:get_description()
 304         return self._data.description;
 305 end
 306 function room_mt:set_password(password)
 307         if password == "" or type(password) ~= "string" then password = nil; end
 308         if self._data.password ~= password then
 309                 self._data.password = password;
 310                 if self.save then self:save(true); end
 311         end
 312 end
 313 function room_mt:get_password()
 314         return self._data.password;
 315 end
 316 function room_mt:set_moderated(moderated)
 317         moderated = moderated and true or nil;
 318         if self._data.moderated ~= moderated then
 319                 self._data.moderated = moderated;
 320                 if self.save then self:save(true); end
 321         end
 322 end
 323 function room_mt:get_moderated()
 324         return self._data.moderated;
 325 end
 326 function room_mt:set_members_only(members_only)
 327         members_only = members_only and true or nil;
 328         if self._data.members_only ~= members_only then
 329                 self._data.members_only = members_only;
 330                 if self.save then self:save(true); end
 331         end
 332 end
 333 function room_mt:get_members_only()
 334         return self._data.members_only;
 335 end
 336 function room_mt:set_persistent(persistent)
 337         persistent = persistent and true or nil;
 338         if self._data.persistent ~= persistent then
 339                 self._data.persistent = persistent;
 340                 if self.save then self:save(true); end
 341         end
 342 end
 343 function room_mt:get_persistent()
 344         return self._data.persistent;
 345 end
 346 function room_mt:set_hidden(hidden)
 347         hidden = hidden and true or nil;
 348         if self._data.hidden ~= hidden then
 349                 self._data.hidden = hidden;
 350                 if self.save then self:save(true); end
 351         end
 352 end
 353 function room_mt:get_hidden()
 354         return self._data.hidden;
 355 end
 356 function room_mt:get_public()
 357         return not self:get_hidden();
 358 end
 359 function room_mt:set_public(public)
 360         return self:set_hidden(not public);
 361 end
 362 function room_mt:set_changesubject(changesubject)
 363         changesubject = changesubject and true or nil;
 364         if self._data.changesubject ~= changesubject then
 365                 self._data.changesubject = changesubject;
 366                 if self.save then self:save(true); end
 367         end
 368 end
 369 function room_mt:get_changesubject()
 370         return self._data.changesubject;
 371 end
 372 function room_mt:get_historylength()
 373         return self._data.history_length or default_history_length;
 374 end
 375 function room_mt:set_historylength(length)
 376         length = math.min(tonumber(length) or default_history_length, max_history_length or math.huge);
 377         if length == default_history_length then
 378                 length = nil;
 379         end
 380         self._data.history_length = length;
 381 end
 382
 383
 384 local valid_whois = { moderators = true, anyone = true };
 385
 386 function room_mt:set_whois(whois)
 387         if valid_whois[whois] and self._data.whois ~= whois then
 388                 self._data.whois = whois;
 389                 if self.save then self:save(true); end
 390         end
 391 end
 392
 393 function room_mt:get_whois()
 394         return self._data.whois;
 395 end
 396
 397 function room_mt:handle_unavailable_to_occupant(origin, stanza)
 398         local from = stanza.attr.from;
 399         local current_nick = self:get_occupant_jid(from);
 400         if not current_nick then
 401                 return true; -- discard
 402         end
 403         local pr = get_filtered_presence(stanza);
 404         pr.attr.from = current_nick;
 405         log("debug", "%s leaving %s", current_nick, self.jid);
 406         self._jid_nick[from] = nil;
 407         local occupant = self._occupants[current_nick];
 408         local new_jid = next(occupant.sessions);
 409         if new_jid == from then new_jid = next(occupant.sessions, new_jid); end
 410         if new_jid then
 411                 local jid = occupant.jid;
 412                 occupant.jid = new_jid;
 413                 occupant.sessions[from] = nil;
 414                 pr.attr.to = from;
 415                 pr:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 416                         :tag("item", {affiliation=occupant.affiliation or "none", role='none'}):up()
 417                         :tag("status", {code='110'}):up();
 418                 self:_route_stanza(pr);
 419                 if jid ~= new_jid then
 420                         pr = st.clone(occupant.sessions[new_jid])
 421                                 :tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 422                                 :tag("item", {affiliation=occupant.affiliation or "none", role=occupant.role or "none"});
 423                         pr.attr.from = current_nick;
 424                         self:broadcast_except_nick(pr, current_nick);
 425                 end
 426         else
 427                 occupant.role = 'none';
 428                 self:broadcast_presence(pr, from);
 429                 self._occupants[current_nick] = nil;
 430                 module:fire_event("muc-occupant-left", { room = self; nick = current_nick; });
 431         end
 432         return true;
 433 end
 434
 435 function room_mt:handle_occupant_presence(origin, stanza)
 436         local from = stanza.attr.from;
 437         local pr = get_filtered_presence(stanza);
 438         local current_nick = stanza.attr.to
 439         pr.attr.from = current_nick;
 440         log("debug", "%s broadcasted presence", current_nick);
 441         self._occupants[current_nick].sessions[from] = pr;
 442         self:broadcast_presence(pr, from);
 443         return true;
 444 end
 445
 446 function room_mt:handle_change_nick(origin, stanza, current_nick, to)
 447         local from = stanza.attr.from;
 448         local occupant = self._occupants[current_nick];
 449         local is_multisession = next(occupant.sessions, next(occupant.sessions));
 450         if self._occupants[to] or is_multisession then
 451                 log("debug", "%s couldn't change nick", current_nick);
 452                 local reply = st.error_reply(stanza, "cancel", "conflict"):up();
 453                 reply.tags[1].attr.code = "409";
 454                 origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 455                 return true;
 456         else
 457                 local to_nick = select(3, jid_split(to));
 458                 log("debug", "%s (%s) changing nick to %s", current_nick, occupant.jid, to);
 459                 local p = st.presence({type='unavailable', from=current_nick});
 460                 self:broadcast_presence(p, from, '303', to_nick);
 461                 self._occupants[current_nick] = nil;
 462                 self._occupants[to] = occupant;
 463                 self._jid_nick[from] = to;
 464                 local pr = get_filtered_presence(stanza);
 465                 pr.attr.from = to;
 466                 self._occupants[to].sessions[from] = pr;
 467                 self:broadcast_presence(pr, from);
 468                 return true;
 469         end
 470 end
 471
 472 function room_mt:handle_join(origin, stanza)
 473         local from, to = stanza.attr.from, stanza.attr.to;
 474         log("debug", "%s joining as %s", from, to);
 475         local password = stanza:get_child("x", "http://jabber.org/protocol/muc");
 476         password = password and password:get_child("password", "http://jabber.org/protocol/muc");
 477         password = password and password[1] ~= "" and password[1];
 478         if self:get_password() and self:get_password() ~= password then
 479                 log("debug", "%s couldn't join due to invalid password: %s", from, to);
 480                 local reply = st.error_reply(stanza, "auth", "not-authorized"):up();
 481                 reply.tags[1].attr.code = "401";
 482                 origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 483                 return true;
 484         elseif self._occupants[to] -- occupant already exists
 485                 and jid_bare(from) ~= jid_bare(self._occupants[to].jid) then -- and has different bare real jid
 486                 log("debug", "%s couldn't join due to nick conflict: %s", from, to);
 487                 local reply = st.error_reply(stanza, "cancel", "conflict"):up();
 488                 reply.tags[1].attr.code = "409";
 489                 origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 490                 return true;
 491         end
 492         if not next(self._affiliations) then -- new room, no owners
 493                 self._affiliations[jid_bare(from)] = "owner";
 494                 if self:is_locked() and not stanza:get_child("x", "http://jabber.org/protocol/muc") then
 495                         self:unlock(); -- Older groupchat protocol doesn't lock
 496                 end
 497         elseif self:is_locked() then -- Deny entry
 498                 origin.send(st.error_reply(stanza, "cancel", "item-not-found"));
 499                 return true;
 500         end
 501         local affiliation = self:get_affiliation(from);
 502         local role = self:get_default_role(affiliation)
 503         if role then -- new occupant
 504                 local is_merge = not not self._occupants[to]
 505                 if not is_merge then
 506                         self._occupants[to] = {affiliation=affiliation, role=role, jid=from, sessions={[from]=get_filtered_presence(stanza)}};
 507                 else
 508                         self._occupants[to].sessions[from] = get_filtered_presence(stanza);
 509                 end
 510                 self._jid_nick[from] = to;
 511                 self:send_occupant_list(from);
 512                 local pr = get_filtered_presence(stanza);
 513                 pr.attr.from = to;
 514                 pr:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 515                         :tag("item", {affiliation=affiliation or "none", role=role or "none"}):up();
 516                 if not is_merge then
 517                         self:broadcast_except_nick(pr, to);
 518                 end
 519                 pr:tag("status", {code='110'}):up();
 520                 if self:get_whois() == 'anyone' then
 521                         pr:tag("status", {code='100'}):up();
 522                 end
 523                 if self:is_locked() then
 524                         pr:tag("status", {code='201'}):up();
 525                 end
 526                 pr.attr.to = from;
 527                 self:_route_stanza(pr);
 528                 self:send_history(from, stanza);
 529                 self:send_subject(from);
 530                 return true;
 531         elseif not affiliation then -- registration required for entering members-only room
 532                 local reply = st.error_reply(stanza, "auth", "registration-required"):up();
 533                 reply.tags[1].attr.code = "407";
 534                 origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 535                 return true;
 536         else -- banned
 537                 local reply = st.error_reply(stanza, "auth", "forbidden"):up();
 538                 reply.tags[1].attr.code = "403";
 539                 origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 540                 return true;
 541         end
 542 end
 543
 544 function room_mt:handle_available_to_occupant(origin, stanza)
 545         local from, to = stanza.attr.from, stanza.attr.to;
 546         local current_nick = self:get_occupant_jid(from);
 547         if current_nick then
 548                 --if #pr == #stanza or current_nick ~= to then -- commented because google keeps resending directed presence
 549                         if current_nick == to then -- simple presence
 550                                 return self:handle_occupant_presence(origin, stanza)
 551                         else -- change nick
 552                                 return self:handle_change_nick(origin, stanza, current_nick, to)
 553                         end
 554                 --else -- possible rejoin
 555                 --      log("debug", "%s had connection replaced", current_nick);
 556                 --      self:handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to})
 557                 --              :tag('status'):text('Replaced by new connection'):up()); -- send unavailable
 558                 --      self:handle_to_occupant(origin, stanza); -- resend available
 559                 --end
 560         else -- enter room
 561                 return self:handle_join(origin, stanza)
 562         end
 563 end
 564
 565 function room_mt:handle_presence_to_occupant(origin, stanza)
 566         local type = stanza.attr.type;
 567         if type == "error" then -- error, kick em out!
 568                 return self:handle_kickable(origin, stanza)
 569         elseif type == "unavailable" then -- unavailable
 570                 return self:handle_unavailable_to_occupant(origin, stanza)
 571         elseif not type then -- available
 572                 return self:handle_available_to_occupant(origin, stanza)
 573         elseif type ~= 'result' then -- bad type
 574                 if type ~= 'visible' and type ~= 'invisible' then -- COMPAT ejabberd can broadcast or forward XEP-0018 presences
 575                         origin.send(st.error_reply(stanza, "modify", "bad-request")); -- FIXME correct error?
 576                 end
 577         end
 578         return true;
 579 end
 580
 581 function room_mt:handle_iq_to_occupant(origin, stanza)
 582         local from, to = stanza.attr.from, stanza.attr.to;
 583         local type = stanza.attr.type;
 584         local id = stanza.attr.id;
 585         local current_nick = self:get_occupant_jid(from);
 586         local o_data = self._occupants[to];
 587         if (type == "error" or type == "result") then
 588                 do -- deconstruct_stanza_id
 589                         if not current_nick or not o_data then return nil; end
 590                         local from_jid, id, to_jid_hash = (base64.decode(stanza.attr.id) or ""):match("^(.+)%z(.*)%z(.+)$");
 591                         if not(from == from_jid or from == jid_bare(from_jid)) then return nil; end
 592                         local session_jid
 593                         for to_jid in pairs(o_data.sessions) do
 594                                 if md5(to_jid) == to_jid_hash then
 595                                         session_jid = to_jid;
 596                                         break;
 597                                 end
 598                         end
 599                         if session_jid == nil then return nil; end
 600                         stanza.attr.from, stanza.attr.to, stanza.attr.id = current_nick, session_jid, id
 601                 end
 602                 log("debug", "%s sent private iq stanza to %s (%s)", from, to, stanza.attr.to);
 603                 self:_route_stanza(stanza);
 604                 stanza.attr.from, stanza.attr.to, stanza.attr.id = from, to, id;
 605                 return true;
 606         else -- Type is "get" or "set"
 607                 if not current_nick then
 608                         origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 609                         return true;
 610                 end
 611                 if not o_data then -- recipient not in room
 612                         origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Recipient not in room"));
 613                         return true;
 614                 end
 615                 do -- construct_stanza_id
 616                         stanza.attr.id = base64.encode(o_data.jid.."\0"..stanza.attr.id.."\0"..md5(from));
 617                 end
 618                 stanza.attr.from, stanza.attr.to = current_nick, o_data.jid;
 619                 log("debug", "%s sent private iq stanza to %s (%s)", from, to, o_data.jid);
 620                 if stanza.tags[1].attr.xmlns == 'vcard-temp' then
 621                         stanza.attr.to = jid_bare(stanza.attr.to);
 622                 end
 623                 self:_route_stanza(stanza);
 624                 stanza.attr.from, stanza.attr.to, stanza.attr.id = from, to, id;
 625                 return true;
 626         end
 627 end
 628
 629 function room_mt:handle_message_to_occupant(origin, stanza)
 630         local from, to = stanza.attr.from, stanza.attr.to;
 631         local current_nick = self:get_occupant_jid(from);
 632         local type = stanza.attr.type;
 633         if not current_nick then -- not in room
 634                 if type ~= "error" then
 635                         origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 636                 end
 637                 return true;
 638         end
 639         if type == "groupchat" then -- groupchat messages not allowed in PM
 640                 origin.send(st.error_reply(stanza, "modify", "bad-request"));
 641                 return true;
 642         elseif type == "error" and is_kickable_error(stanza) then
 643                 log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
 644                 return self:handle_kickable(origin, stanza); -- send unavailable
 645         end
 646
 647         local o_data = self._occupants[to];
 648         if not o_data then
 649                 origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Recipient not in room"));
 650                 return true;
 651         end
 652         log("debug", "%s sent private message stanza to %s (%s)", from, to, o_data.jid);
 653         stanza:tag("x", { xmlns = "http://jabber.org/protocol/muc#user" }):up();
 654         stanza.attr.from = current_nick;
 655         self:route_to_occupant(o_data, stanza)
 656         stanza.attr.from = from;
 657         return true;
 658 end
 659
 660 function room_mt:send_form(origin, stanza)
 661         origin.send(st.reply(stanza):query("http://jabber.org/protocol/muc#owner")
 662                 :add_child(self:get_form_layout(stanza.attr.from):form())
 663         );
 664 end
 665
 666 function room_mt:get_form_layout(actor)
 667         local whois = self:get_whois()
 668         local form = dataform.new({
 669                 title = "Configuration for "..self.jid,
 670                 instructions = "Complete and submit this form to configure the room.",
 671                 {
 672                         name = 'FORM_TYPE',
 673                         type = 'hidden',
 674                         value = 'http://jabber.org/protocol/muc#roomconfig'
 675                 },
 676                 {
 677                         name = 'muc#roomconfig_roomname',
 678                         type = 'text-single',
 679                         label = 'Name',
 680                         value = self:get_name() or "",
 681                 },
 682                 {
 683                         name = 'muc#roomconfig_roomdesc',
 684                         type = 'text-single',
 685                         label = 'Description',
 686                         value = self:get_description() or "",
 687                 },
 688                 {
 689                         name = 'muc#roomconfig_persistentroom',
 690                         type = 'boolean',
 691                         label = 'Make Room Persistent?',
 692                         value = self:get_persistent()
 693                 },
 694                 {
 695                         name = 'muc#roomconfig_publicroom',
 696                         type = 'boolean',
 697                         label = 'Make Room Publicly Searchable?',
 698                         value = not self:get_hidden()
 699                 },
 700                 {
 701                         name = 'muc#roomconfig_changesubject',
 702                         type = 'boolean',
 703                         label = 'Allow Occupants to Change Subject?',
 704                         value = self:get_changesubject()
 705                 },
 706                 {
 707                         name = 'muc#roomconfig_whois',
 708                         type = 'list-single',
 709                         label = 'Who May Discover Real JIDs?',
 710                         value = {
 711                                 { value = 'moderators', label = 'Moderators Only', default = whois == 'moderators' },
 712                                 { value = 'anyone',     label = 'Anyone',          default = whois == 'anyone' }
 713                         }
 714                 },
 715                 {
 716                         name = 'muc#roomconfig_roomsecret',
 717                         type = 'text-private',
 718                         label = 'Password',
 719                         value = self:get_password() or "",
 720                 },
 721                 {
 722                         name = 'muc#roomconfig_moderatedroom',
 723                         type = 'boolean',
 724                         label = 'Make Room Moderated?',
 725                         value = self:get_moderated()
 726                 },
 727                 {
 728                         name = 'muc#roomconfig_membersonly',
 729                         type = 'boolean',
 730                         label = 'Make Room Members-Only?',
 731                         value = self:get_members_only()
 732                 },
 733                 {
 734                         name = 'muc#roomconfig_historylength',
 735                         type = 'text-single',
 736                         label = 'Maximum Number of History Messages Returned by Room',
 737                         value = tostring(self:get_historylength())
 738                 }
 739         });
 740         return module:fire_event("muc-config-form", { room = self, actor = actor, form = form }) or form;
 741 end
 742
 743 function room_mt:process_form(origin, stanza)
 744         local query = stanza.tags[1];
 745         local form = query:get_child("x", "jabber:x:data")
 746         if not form then origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); return; end
 747         if form.attr.type == "cancel" then origin.send(st.reply(stanza)); return; end
 748         if form.attr.type ~= "submit" then origin.send(st.error_reply(stanza, "cancel", "bad-request", "Not a submitted form")); return; end
 749
 750         local fields = self:get_form_layout(stanza.attr.from):data(form);
 751         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
 752
 753
 754         local changed = {};
 755
 756         local function handle_option(name, field, allowed)
 757                 local new = fields[field];
 758                 if new == nil then return; end
 759                 if allowed and not allowed[new] then return; end
 760                 if new == self["get_"..name](self) then return; end
 761                 changed[name] = true;
 762                 self["set_"..name](self, new);
 763         end
 764
 765         local event = { room = self, fields = fields, changed = changed, stanza = stanza, origin = origin, update_option = handle_option };
 766         module:fire_event("muc-config-submitted", event);
 767
 768         handle_option("name", "muc#roomconfig_roomname");
 769         handle_option("description", "muc#roomconfig_roomdesc");
 770         handle_option("persistent", "muc#roomconfig_persistentroom");
 771         handle_option("moderated", "muc#roomconfig_moderatedroom");
 772         handle_option("members_only", "muc#roomconfig_membersonly");
 773         handle_option("public", "muc#roomconfig_publicroom");
 774         handle_option("changesubject", "muc#roomconfig_changesubject");
 775         handle_option("historylength", "muc#roomconfig_historylength");
 776         handle_option("whois", "muc#roomconfig_whois", valid_whois);
 777         handle_option("password", "muc#roomconfig_roomsecret");
 778
 779         if self.save then self:save(true); end
 780         if self:is_locked() then
 781                 self:unlock();
 782         end
 783         origin.send(st.reply(stanza));
 784
 785         if next(changed) then
 786                 local msg = st.message({type='groupchat', from=self.jid})
 787                         :tag('x', {xmlns='http://jabber.org/protocol/muc#user'}):up()
 788                                 :tag('status', {code = '104'}):up();
 789                 if changed.whois then
 790                         local code = (self:get_whois() == 'moderators') and "173" or "172";
 791                         msg.tags[1]:tag('status', {code = code}):up();
 792                 end
 793                 self:broadcast_message(msg, false)
 794         end
 795 end
 796
 797 function room_mt:destroy(newjid, reason, password)
 798         local pr = st.presence({type = "unavailable"})
 799                 :tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 800                         :tag("item", { affiliation='none', role='none' }):up()
 801                         :tag("destroy", {jid=newjid})
 802         if reason then pr:tag("reason"):text(reason):up(); end
 803         if password then pr:tag("password"):text(password):up(); end
 804         for nick, occupant in pairs(self._occupants) do
 805                 pr.attr.from = nick;
 806                 for jid in pairs(occupant.sessions) do
 807                         pr.attr.to = jid;
 808                         self:_route_stanza(pr);
 809                         self._jid_nick[jid] = nil;
 810                 end
 811                 self._occupants[nick] = nil;
 812                 module:fire_event("muc-occupant-left", { room = self; nick = nick; });
 813         end
 814         self:set_persistent(false);
 815         module:fire_event("muc-room-destroyed", { room = self });
 816 end
 817
 818 function room_mt:handle_disco_info_get_query(origin, stanza)
 819         origin.send(self:get_disco_info(stanza));
 820         return true;
 821 end
 822
 823 function room_mt:handle_disco_items_get_query(origin, stanza)
 824         origin.send(self:get_disco_items(stanza));
 825         return true;
 826 end
 827
 828 function room_mt:handle_admin_item_set_command(origin, stanza)
 829         local item = stanza.tags[1].tags[1];
 830         if item.attr.jid then -- Validate provided JID
 831                 item.attr.jid = jid_prep(item.attr.jid);
 832                 if not item.attr.jid then
 833                         origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
 834                         return true;
 835                 end
 836         end
 837         if not item.attr.jid and item.attr.nick then -- COMPAT Workaround for Miranda sending 'nick' instead of 'jid' when changing affiliation
 838                 local occupant = self._occupants[self.jid.."/"..item.attr.nick];
 839                 if occupant then item.attr.jid = occupant.jid; end
 840         elseif not item.attr.nick and item.attr.jid then
 841                 local nick = self:get_occupant_jid(item.attr.jid);
 842                 if nick then item.attr.nick = select(3, jid_split(nick)); end
 843         end
 844         local actor = stanza.attr.from;
 845         local callback = function() origin.send(st.reply(stanza)); end
 846         local reason = item:get_child_text("reason");
 847         if item.attr.affiliation and item.attr.jid and not item.attr.role then
 848                 local success, errtype, err = self:set_affiliation(actor, item.attr.jid, item.attr.affiliation, callback, reason);
 849                 if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 850                 return true;
 851         elseif item.attr.role and item.attr.nick and not item.attr.affiliation then
 852                 local success, errtype, err = self:set_role(actor, self.jid.."/"..item.attr.nick, item.attr.role, callback, reason);
 853                 if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 854                 return true;
 855         else
 856                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 857                 return true;
 858         end
 859 end
 860
 861 function room_mt:handle_admin_item_get_command(origin, stanza)
 862         local actor = stanza.attr.from;
 863         local affiliation = self:get_affiliation(actor);
 864         local item = stanza.tags[1].tags[1];
 865         local _aff = item.attr.affiliation;
 866         local _rol = item.attr.role;
 867         if _aff and not _rol then
 868                 if affiliation == "owner" or (affiliation == "admin" and _aff ~= "owner" and _aff ~= "admin") then
 869                         local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 870                         for jid, affiliation in pairs(self._affiliations) do
 871                                 if affiliation == _aff then
 872                                         reply:tag("item", {affiliation = _aff, jid = jid}):up();
 873                                 end
 874                         end
 875                         origin.send(reply);
 876                         return true;
 877                 else
 878                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 879                         return true;
 880                 end
 881         elseif _rol and not _aff then
 882                 local role = self:get_role(self:get_occupant_jid(actor)) or self:get_default_role(affiliation);
 883                 if role == "moderator" then
 884                         if _rol == "none" then _rol = nil; end
 885                         local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 886                         for occupant_jid, occupant in pairs(self._occupants) do
 887                                 if occupant.role == _rol then
 888                                         reply:tag("item", {
 889                                                 nick = select(3, jid_split(occupant_jid)),
 890                                                 role = _rol or "none",
 891                                                 affiliation = occupant.affiliation or "none",
 892                                                 jid = occupant.jid
 893                                                 }):up();
 894                                 end
 895                         end
 896                         origin.send(reply);
 897                         return true;
 898                 else
 899                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 900                         return true;
 901                 end
 902         else
 903                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 904                 return true;
 905         end
 906 end
 907
 908 function room_mt:handle_owner_query_get_to_room(origin, stanza)
 909         if self:get_affiliation(stanza.attr.from) ~= "owner" then
 910                 origin.send(st.error_reply(stanza, "auth", "forbidden", "Only owners can configure rooms"));
 911                 return true;
 912         end
 913
 914         self:send_form(origin, stanza);
 915         return true;
 916 end
 917 function room_mt:handle_owner_query_set_to_room(origin, stanza)
 918         if self:get_affiliation(stanza.attr.from) ~= "owner" then
 919                 origin.send(st.error_reply(stanza, "auth", "forbidden", "Only owners can configure rooms"));
 920                 return true;
 921         end
 922
 923         local child = stanza.tags[1].tags[1];
 924         if not child then
 925                 origin.send(st.error_reply(stanza, "modify", "bad-request"));
 926                 return true;
 927         elseif child.name == "destroy" then
 928                 local newjid = child.attr.jid;
 929                 local reason = child:get_child_text("reason");
 930                 local password = child:get_child_text("password");
 931                 self:destroy(newjid, reason, password);
 932                 origin.send(st.reply(stanza));
 933                 return true;
 934         else
 935                 self:process_form(origin, stanza);
 936                 return true;
 937         end
 938 end
 939
 940 function room_mt:handle_groupchat_to_room(origin, stanza)
 941         local from = stanza.attr.from;
 942         local current_nick = self:get_occupant_jid(from);
 943         local occupant = self._occupants[current_nick];
 944         if not occupant then -- not in room
 945                 origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 946                 return true;
 947         elseif occupant.role == "visitor" then
 948                 origin.send(st.error_reply(stanza, "auth", "forbidden"));
 949                 return true;
 950         else
 951                 local from = stanza.attr.from;
 952                 stanza.attr.from = current_nick;
 953                 local subject = stanza:get_child_text("subject");
 954                 if subject then
 955                         if occupant.role == "moderator" or
 956                                 ( self:get_changesubject() and occupant.role == "participant" ) then -- and participant
 957                                 self:set_subject(current_nick, subject);
 958                         else
 959                                 stanza.attr.from = from;
 960                                 origin.send(st.error_reply(stanza, "auth", "forbidden"));
 961                         end
 962                 else
 963                         self:broadcast_message(stanza, self:get_historylength() > 0 and stanza:get_child("body"));
 964                 end
 965                 stanza.attr.from = from;
 966                 return true;
 967         end
 968 end
 969
 970 -- hack - some buggy clients send presence updates to the room rather than their nick
 971 function room_mt:handle_presence_to_room(origin, stanza)
 972         local current_nick = self:get_occupant_jid(stanza.attr.from);
 973         local handled
 974         if current_nick then
 975                 local to = stanza.attr.to;
 976                 stanza.attr.to = current_nick;
 977                 handled = self:handle_presence_to_occupant(origin, stanza);
 978                 stanza.attr.to = to;
 979         end
 980         return handled;
 981 end
 982
 983 function room_mt:handle_mediated_invite(origin, stanza)
 984         local payload = stanza:get_child("x", "http://jabber.org/protocol/muc#user"):get_child("invite")
 985         local _from, _to = stanza.attr.from, stanza.attr.to;
 986         local current_nick = self:get_occupant_jid(_from)
 987         -- Need visitor role or higher to invite
 988         if not self:get_role(current_nick) or not self:get_default_role(self:get_affiliation(_from)) then
 989                 origin.send(st.error_reply(stanza, "auth", "forbidden"));
 990                 return true;
 991         end
 992         local _invitee = jid_prep(payload.attr.to);
 993         if _invitee then
 994                 if self:get_whois() == "moderators" then
 995                         _from = current_nick;
 996                 end
 997                 local _reason = payload:get_child_text("reason")
 998                 local invite = st.message({from = _to, to = _invitee, id = stanza.attr.id})
 999                         :tag('x', {xmlns='http://jabber.org/protocol/muc#user'})
1000                                 :tag('invite', {from=_from})
1001                                         :tag('reason'):text(_reason or ""):up()
1002                                 :up();
1003                 local password = self:get_password()
1004                 if password then
1005                         invite:tag("password"):text(password):up();
1006                 end
1007                         invite:up()
1008                         :tag('x', {xmlns="jabber:x:conference", jid=_to}) -- COMPAT: Some older clients expect this
1009                                 :text(_reason or "")
1010                         :up()
1011                         :tag('body') -- Add a plain message for clients which don't support invites
1012                                 :text(_from..' invited you to the room '.._to..(_reason and (' ('.._reason..')') or ""))
1013                         :up();
1014                 module:fire_event("muc-invite", { room = self, stanza = invite, origin = origin, incoming = stanza });
1015                 return true;
1016         else
1017                 origin.send(st.error_reply(stanza, "cancel", "jid-malformed"));
1018                 return true;
1019         end
1020 end
1021
1022 module:hook("muc-invite", function(event)
1023         event.room:_route_stanza(event.stanza);
1024         return true;
1025 end, -1)
1026
1027 -- When an invite is sent; add an affiliation for the invitee
1028 module:hook("muc-invite", function(event)
1029         local room, stanza = event.room, event.stanza
1030         local invitee = stanza.attr.to
1031         if room:get_members_only() and not room:get_affiliation(invitee) then
1032                 local from = stanza:get_child("x", "http://jabber.org/protocol/muc#user"):get_child("invite").attr.from
1033                 local current_nick = room:get_occupant_jid(from)
1034                 log("debug", "%s invited %s into members only room %s, granting membership", from, invitee, room.jid);
1035                 room:set_affiliation(from, invitee, "member", nil, "Invited by " .. current_nick)
1036         end
1037 end)
1038
1039 function room_mt:handle_mediated_decline(origin, stanza)
1040         local payload = stanza:get_child("x", "http://jabber.org/protocol/muc#user"):get_child("decline")
1041         local declinee = jid_prep(payload.attr.to);
1042         if declinee then
1043                 local from, to = stanza.attr.from, stanza.attr.to;
1044                 -- TODO: Validate declinee
1045                 local reason = payload:get_child_text("reason")
1046                 local decline = st.message({from = to, to = declinee, id = stanza.attr.id})
1047                         :tag('x', {xmlns='http://jabber.org/protocol/muc#user'})
1048                                 :tag('decline', {from=from})
1049                                         :tag('reason'):text(reason or ""):up()
1050                                 :up()
1051                         :up()
1052                         :tag('body') -- Add a plain message for clients which don't support declines
1053                                 :text(from..' declined your invite to the room '..to..(reason and (' ('..reason..')') or ""))
1054                         :up();
1055                 module:fire_event("muc-decline", { room = self, stanza = decline, origin = origin, incoming = stanza });
1056                 return true;
1057         else
1058                 origin.send(st.error_reply(stanza, "cancel", "jid-malformed"));
1059                 return true;
1060         end
1061 end
1062
1063 module:hook("muc-decline", function(event)
1064         event.room:_route_stanza(event.stanza);
1065         return true;
1066 end, -1)
1067
1068 function room_mt:handle_message_to_room(origin, stanza)
1069         local type = stanza.attr.type;
1070         if type == "groupchat" then
1071                 return self:handle_groupchat_to_room(origin, stanza)
1072         elseif type == "error" and is_kickable_error(stanza) then
1073                 return self:handle_kickable(origin, stanza)
1074         elseif type == nil then
1075                 local x = stanza:get_child("x", "http://jabber.org/protocol/muc#user");
1076                 if x then
1077                         local payload = x.tags[1];
1078                         if payload == nil then
1079                                 -- fallthrough
1080                         elseif payload.name == "invite" and payload.attr.to then
1081                                 return self:handle_mediated_invite(origin, stanza)
1082                         elseif payload.name == "decline" and payload.attr.to then
1083                                 return self:handle_mediated_decline(origin, stanza)
1084                         end
1085                         origin.send(st.error_reply(stanza, "cancel", "bad-request"));
1086                         return true;
1087                 end
1088         else
1089                 return nil;
1090         end
1091 end
1092
1093 function room_mt:route_stanza(stanza)
1094         module:send(stanza)
1095 end
1096
1097 function room_mt:get_affiliation(jid)
1098         local node, host, resource = jid_split(jid);
1099         local bare = node and node.."@"..host or host;
1100         local result = self._affiliations[bare]; -- Affiliations are granted, revoked, and maintained based on the user's bare JID.
1101         if not result and self._affiliations[host] == "outcast" then result = "outcast"; end -- host banned
1102         return result;
1103 end
1104 function room_mt:set_affiliation(actor, jid, affiliation, callback, reason)
1105         jid = jid_bare(jid);
1106         if affiliation == "none" then affiliation = nil; end
1107         if affiliation and affiliation ~= "outcast" and affiliation ~= "owner" and affiliation ~= "admin" and affiliation ~= "member" then
1108                 return nil, "modify", "not-acceptable";
1109         end
1110         if actor ~= true then
1111                 local actor_affiliation = self:get_affiliation(actor);
1112                 local target_affiliation = self:get_affiliation(jid);
1113                 if target_affiliation == affiliation then -- no change, shortcut
1114                         if callback then callback(); end
1115                         return true;
1116                 end
1117                 if actor_affiliation ~= "owner" then
1118                         if affiliation == "owner" or affiliation == "admin" or actor_affiliation ~= "admin" or target_affiliation == "owner" or target_affiliation == "admin" then
1119                                 return nil, "cancel", "not-allowed";
1120                         end
1121                 elseif target_affiliation == "owner" and jid_bare(actor) == jid then -- self change
1122                         local is_last = true;
1123                         for j, aff in pairs(self._affiliations) do if j ~= jid and aff == "owner" then is_last = false; break; end end
1124                         if is_last then
1125                                 return nil, "cancel", "conflict";
1126                         end
1127                 end
1128         end
1129         self._affiliations[jid] = affiliation;
1130         local role = self:get_default_role(affiliation);
1131         local x = st.stanza("x", {xmlns = "http://jabber.org/protocol/muc#user"})
1132                         :tag("item", {affiliation=affiliation or "none", role=role or "none"})
1133                                 :tag("reason"):text(reason or ""):up()
1134                         :up();
1135         local presence_type = nil;
1136         if not role then -- getting kicked
1137                 presence_type = "unavailable";
1138                 if affiliation == "outcast" then
1139                         x:tag("status", {code="301"}):up(); -- banned
1140                 else
1141                         x:tag("status", {code="321"}):up(); -- affiliation change
1142                 end
1143         end
1144         local modified_nicks = {};
1145         for nick, occupant in pairs(self._occupants) do
1146                 if jid_bare(occupant.jid) == jid then
1147                         if not role then -- getting kicked
1148                                 self._occupants[nick] = nil;
1149                         else
1150                                 occupant.affiliation, occupant.role = affiliation, role;
1151                         end
1152                         for jid,pres in pairs(occupant.sessions) do -- remove for all sessions of the nick
1153                                 if not role then self._jid_nick[jid] = nil; end
1154                                 local p = st.clone(pres);
1155                                 p.attr.from = nick;
1156                                 p.attr.type = presence_type;
1157                                 p.attr.to = jid;
1158                                 p:add_child(x);
1159                                 self:_route_stanza(p);
1160                                 if occupant.jid == jid then
1161                                         modified_nicks[nick] = p;
1162                                 end
1163                         end
1164                 end
1165         end
1166         if self.save then self:save(); end
1167         if callback then callback(); end
1168         for nick,p in pairs(modified_nicks) do
1169                 p.attr.from = nick;
1170                 self:broadcast_except_nick(p, nick);
1171         end
1172         return true;
1173 end
1174
1175 function room_mt:get_role(nick)
1176         local session = self._occupants[nick];
1177         return session and session.role or nil;
1178 end
1179 function room_mt:can_set_role(actor_jid, occupant_jid, role)
1180         local occupant = self._occupants[occupant_jid];
1181         if not occupant or not actor_jid then return nil, "modify", "not-acceptable"; end
1182
1183         if actor_jid == true then return true; end
1184
1185         local actor = self._occupants[self:get_occupant_jid(actor_jid)];
1186         if actor.role == "moderator" then
1187                 if occupant.affiliation ~= "owner" and occupant.affiliation ~= "admin" then
1188                         if actor.affiliation == "owner" or actor.affiliation == "admin" then
1189                                 return true;
1190                         elseif occupant.role ~= "moderator" and role ~= "moderator" then
1191                                 return true;
1192                         end
1193                 end
1194         end
1195         return nil, "cancel", "not-allowed";
1196 end
1197 function room_mt:set_role(actor, occupant_jid, role, callback, reason)
1198         if role == "none" then role = nil; end
1199         if role and role ~= "moderator" and role ~= "participant" and role ~= "visitor" then return nil, "modify", "not-acceptable"; end
1200         local allowed, err_type, err_condition = self:can_set_role(actor, occupant_jid, role);
1201         if not allowed then return allowed, err_type, err_condition; end
1202         local occupant = self._occupants[occupant_jid];
1203         local x = st.stanza("x", {xmlns = "http://jabber.org/protocol/muc#user"})
1204                         :tag("item", {affiliation=occupant.affiliation or "none", nick=select(3, jid_split(occupant_jid)), role=role or "none"})
1205                                 :tag("reason"):text(reason or ""):up()
1206                         :up();
1207         local presence_type = nil;
1208         if not role then -- kick
1209                 presence_type = "unavailable";
1210                 self._occupants[occupant_jid] = nil;
1211                 for jid in pairs(occupant.sessions) do -- remove for all sessions of the nick
1212                         self._jid_nick[jid] = nil;
1213                 end
1214                 x:tag("status", {code = "307"}):up();
1215         else
1216                 occupant.role = role;
1217         end
1218         local bp;
1219         for jid,pres in pairs(occupant.sessions) do -- send to all sessions of the nick
1220                 local p = st.clone(pres);
1221                 p.attr.from = occupant_jid;
1222                 p.attr.type = presence_type;
1223                 p.attr.to = jid;
1224                 p:add_child(x);
1225                 self:_route_stanza(p);
1226                 if occupant.jid == jid then
1227                         bp = p;
1228                 end
1229         end
1230         if callback then callback(); end
1231         if bp then
1232                 self:broadcast_except_nick(bp, occupant_jid);
1233         end
1234         return true;
1235 end
1236
1237 function room_mt:_route_stanza(stanza)
1238         local muc_child;
1239         if stanza.name == "presence" then
1240                 local to_occupant = self._occupants[self:get_occupant_jid(stanza.attr.to)];
1241                 local from_occupant = self._occupants[stanza.attr.from];
1242                 if to_occupant and from_occupant then
1243                         if self:get_whois() == 'anyone' then
1244                             muc_child = stanza:get_child("x", "http://jabber.org/protocol/muc#user");
1245                         else
1246                                 if to_occupant.role == "moderator" or jid_bare(to_occupant.jid) == jid_bare(from_occupant.jid) then
1247                                         muc_child = stanza:get_child("x", "http://jabber.org/protocol/muc#user");
1248                                 end
1249                         end
1250                 end
1251                 if muc_child then
1252                         for item in muc_child:childtags("item") do
1253                                 if from_occupant == to_occupant then
1254                                         item.attr.jid = stanza.attr.to;
1255                                 else
1256                                         item.attr.jid = from_occupant.jid;
1257                                 end
1258                         end
1259                 end
1260         end
1261         self:route_stanza(stanza);
1262         if muc_child then
1263                 for item in muc_child:childtags("item") do
1264                         item.attr.jid = nil;
1265                 end
1266         end
1267 end
1268
1269 local _M = {}; -- module "muc"
1270
1271 function _M.new_room(jid, config)
1272         return setmetatable({
1273                 jid = jid;
1274                 locked = nil;
1275                 _jid_nick = {};
1276                 _occupants = {};
1277                 _data = {
1278                     whois = 'moderators';
1279                     history_length = math.min((config and config.history_length)
1280                         or default_history_length, max_history_length);
1281                 };
1282                 _affiliations = {};
1283         }, room_mt);
1284 end
1285
1286 function _M.set_max_history_length(_max_history_length)
1287         max_history_length = _max_history_length or math.huge;
1288 end
1289
1290 _M.room_mt = room_mt;
1291
1292 return _M;