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