plugins/muc/muc.lib.lua

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