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                 return self:save_to_history(stanza)
 111         end
 112 end
 113 function room_mt:save_to_history(stanza)
 114         local history = self._data['history'];
 115         if not history then history = {}; self._data['history'] = history; end
 116         stanza = st.clone(stanza);
 117         stanza.attr.to = "";
 118         local stamp = datetime.datetime();
 119         stanza:tag("delay", {xmlns = "urn:xmpp:delay", from = muc_domain, stamp = stamp}):up(); -- XEP-0203
 120         stanza:tag("x", {xmlns = "jabber:x:delay", from = muc_domain, stamp = datetime.legacy()}):up(); -- XEP-0091 (deprecated)
 121         local entry = { stanza = stanza, stamp = stamp };
 122         t_insert(history, entry);
 123         while #history > (self._data.history_length or default_history_length) do t_remove(history, 1) end
 124 end
 125 function room_mt:broadcast_except_nick(stanza, nick)
 126         for rnick, occupant in pairs(self._occupants) do
 127                 if rnick ~= nick then
 128                         for jid in pairs(occupant.sessions) do
 129                                 stanza.attr.to = jid;
 130                                 self:_route_stanza(stanza);
 131                         end
 132                 end
 133         end
 134 end
 135
 136 function room_mt:send_occupant_list(to)
 137         local current_nick = self._jid_nick[to];
 138         for occupant, o_data in pairs(self._occupants) do
 139                 if occupant ~= current_nick then
 140                         local pres = get_filtered_presence(o_data.sessions[o_data.jid]);
 141                         pres.attr.to, pres.attr.from = to, occupant;
 142                         pres:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 143                                 :tag("item", {affiliation=o_data.affiliation or "none", role=o_data.role or "none"}):up();
 144                         self:_route_stanza(pres);
 145                 end
 146         end
 147 end
 148 function room_mt:send_history(to, stanza)
 149         local history = self._data['history']; -- send discussion history
 150         if history then
 151                 local x_tag = stanza and stanza:get_child("x", "http://jabber.org/protocol/muc");
 152                 local history_tag = x_tag and x_tag:get_child("history", "http://jabber.org/protocol/muc");
 153
 154                 local maxchars = history_tag and tonumber(history_tag.attr.maxchars);
 155                 if maxchars then maxchars = math.floor(maxchars); end
 156
 157                 local maxstanzas = math.floor(history_tag and tonumber(history_tag.attr.maxstanzas) or #history);
 158                 if not history_tag then maxstanzas = 20; end
 159
 160                 local seconds = history_tag and tonumber(history_tag.attr.seconds);
 161                 if seconds then seconds = datetime.datetime(os.time() - math.floor(seconds)); end
 162
 163                 local since = history_tag and history_tag.attr.since;
 164                 if since then since = datetime.parse(since); since = since and datetime.datetime(since); end
 165                 if seconds and (not since or since < seconds) then since = seconds; end
 166
 167                 local n = 0;
 168                 local charcount = 0;
 169
 170                 for i=#history,1,-1 do
 171                         local entry = history[i];
 172                         if maxchars then
 173                                 if not entry.chars then
 174                                         entry.stanza.attr.to = "";
 175                                         entry.chars = #tostring(entry.stanza);
 176                                 end
 177                                 charcount = charcount + entry.chars + #to;
 178                                 if charcount > maxchars then break; end
 179                         end
 180                         if since and since > entry.stamp then break; end
 181                         if n + 1 > maxstanzas then break; end
 182                         n = n + 1;
 183                 end
 184                 for i=#history-n+1,#history do
 185                         local msg = history[i].stanza;
 186                         msg.attr.to = to;
 187                         self:_route_stanza(msg);
 188                 end
 189         end
 190 end
 191 function room_mt:send_subject(to)
 192         if self._data['subject'] then
 193                 self:_route_stanza(st.message({type='groupchat', from=self._data['subject_from'] or self.jid, to=to}):tag("subject"):text(self._data['subject']));
 194         end
 195 end
 196
 197 function room_mt:get_disco_info(stanza)
 198         local count = 0; for _ in pairs(self._occupants) do count = count + 1; end
 199         return st.reply(stanza):query("http://jabber.org/protocol/disco#info")
 200                 :tag("identity", {category="conference", type="text", name=self:get_name()}):up()
 201                 :tag("feature", {var="http://jabber.org/protocol/muc"}):up()
 202                 :tag("feature", {var=self:get_password() and "muc_passwordprotected" or "muc_unsecured"}):up()
 203                 :tag("feature", {var=self:get_moderated() and "muc_moderated" or "muc_unmoderated"}):up()
 204                 :tag("feature", {var=self:get_members_only() and "muc_membersonly" or "muc_open"}):up()
 205                 :tag("feature", {var=self:get_persistent() and "muc_persistent" or "muc_temporary"}):up()
 206                 :tag("feature", {var=self:get_hidden() and "muc_hidden" or "muc_public"}):up()
 207                 :tag("feature", {var=self._data.whois ~= "anyone" and "muc_semianonymous" or "muc_nonanonymous"}):up()
 208                 :add_child(dataform.new({
 209                         { name = "FORM_TYPE", type = "hidden", value = "http://jabber.org/protocol/muc#roominfo" },
 210                         { name = "muc#roominfo_description", label = "Description", value = "" },
 211                         { name = "muc#roominfo_occupants", label = "Number of occupants", value = tostring(count) }
 212                 }):form({["muc#roominfo_description"] = self:get_description()}, 'result'))
 213         ;
 214 end
 215 function room_mt:get_disco_items(stanza)
 216         local reply = st.reply(stanza):query("http://jabber.org/protocol/disco#items");
 217         for room_jid in pairs(self._occupants) do
 218                 reply:tag("item", {jid = room_jid, name = room_jid:match("/(.*)")}):up();
 219         end
 220         return reply;
 221 end
 222 function room_mt:set_subject(current_nick, subject)
 223         if subject == "" then subject = nil; end
 224         self._data['subject'] = subject;
 225         self._data['subject_from'] = current_nick;
 226         if self.save then self:save(); end
 227         local msg = st.message({type='groupchat', from=current_nick})
 228                 :tag('subject'):text(subject):up();
 229         self:broadcast_message(msg, false);
 230         return true;
 231 end
 232
 233 local function build_unavailable_presence_from_error(stanza)
 234         local type, condition, text = stanza:get_error();
 235         local error_message = "Kicked: "..(condition and condition:gsub("%-", " ") or "presence error");
 236         if text then
 237                 error_message = error_message..": "..text;
 238         end
 239         return st.presence({type='unavailable', from=stanza.attr.from, to=stanza.attr.to})
 240                 :tag('status'):text(error_message);
 241 end
 242
 243 function room_mt:set_name(name)
 244         if name == "" or type(name) ~= "string" or name == (jid_split(self.jid)) then name = nil; end
 245         if self._data.name ~= name then
 246                 self._data.name = name;
 247                 if self.save then self:save(true); end
 248         end
 249 end
 250 function room_mt:get_name()
 251         return self._data.name or jid_split(self.jid);
 252 end
 253 function room_mt:set_description(description)
 254         if description == "" or type(description) ~= "string" then description = nil; end
 255         if self._data.description ~= description then
 256                 self._data.description = description;
 257                 if self.save then self:save(true); end
 258         end
 259 end
 260 function room_mt:get_description()
 261         return self._data.description;
 262 end
 263 function room_mt:set_password(password)
 264         if password == "" or type(password) ~= "string" then password = nil; end
 265         if self._data.password ~= password then
 266                 self._data.password = password;
 267                 if self.save then self:save(true); end
 268         end
 269 end
 270 function room_mt:get_password()
 271         return self._data.password;
 272 end
 273 function room_mt:set_moderated(moderated)
 274         moderated = moderated and true or nil;
 275         if self._data.moderated ~= moderated then
 276                 self._data.moderated = moderated;
 277                 if self.save then self:save(true); end
 278         end
 279 end
 280 function room_mt:get_moderated()
 281         return self._data.moderated;
 282 end
 283 function room_mt:set_members_only(members_only)
 284         members_only = members_only and true or nil;
 285         if self._data.members_only ~= members_only then
 286                 self._data.members_only = members_only;
 287                 if self.save then self:save(true); end
 288         end
 289 end
 290 function room_mt:get_members_only()
 291         return self._data.members_only;
 292 end
 293 function room_mt:set_persistent(persistent)
 294         persistent = persistent and true or nil;
 295         if self._data.persistent ~= persistent then
 296                 self._data.persistent = persistent;
 297                 if self.save then self:save(true); end
 298         end
 299 end
 300 function room_mt:get_persistent()
 301         return self._data.persistent;
 302 end
 303 function room_mt:set_hidden(hidden)
 304         hidden = hidden and true or nil;
 305         if self._data.hidden ~= hidden then
 306                 self._data.hidden = hidden;
 307                 if self.save then self:save(true); end
 308         end
 309 end
 310 function room_mt:get_hidden()
 311         return self._data.hidden;
 312 end
 313 function room_mt:get_public()
 314         return not self:get_hidden();
 315 end
 316 function room_mt:set_public(public)
 317         return self:set_hidden(not public);
 318 end
 319 function room_mt:set_changesubject(changesubject)
 320         changesubject = changesubject and true or nil;
 321         if self._data.changesubject ~= changesubject then
 322                 self._data.changesubject = changesubject;
 323                 if self.save then self:save(true); end
 324         end
 325 end
 326 function room_mt:get_changesubject()
 327         return self._data.changesubject;
 328 end
 329 function room_mt:get_historylength()
 330         return self._data.history_length or default_history_length;
 331 end
 332 function room_mt:set_historylength(length)
 333         length = math.min(tonumber(length) or default_history_length, max_history_length or math.huge);
 334         if length == default_history_length then
 335                 length = nil;
 336         end
 337         self._data.history_length = length;
 338 end
 339
 340
 341 local valid_whois = { moderators = true, anyone = true };
 342
 343 function room_mt:set_whois(whois)
 344         if valid_whois[whois] and self._data.whois ~= whois then
 345                 self._data.whois = whois;
 346                 if self.save then self:save(true); end
 347         end
 348 end
 349
 350 function room_mt:get_whois()
 351         return self._data.whois;
 352 end
 353
 354 local function construct_stanza_id(room, stanza)
 355         local from_jid, to_nick = stanza.attr.from, stanza.attr.to;
 356         local from_nick = room._jid_nick[from_jid];
 357         local occupant = room._occupants[to_nick];
 358         local to_jid = occupant.jid;
 359
 360         return from_nick, to_jid, base64.encode(to_jid.."\0"..stanza.attr.id.."\0"..md5(from_jid));
 361 end
 362 local function deconstruct_stanza_id(room, stanza)
 363         local from_jid_possiblybare, to_nick = stanza.attr.from, stanza.attr.to;
 364         local from_jid, id, to_jid_hash = (base64.decode(stanza.attr.id) or ""):match("^(.+)%z(.*)%z(.+)$");
 365         local from_nick = room._jid_nick[from_jid];
 366
 367         if not(from_nick) then return; end
 368         if not(from_jid_possiblybare == from_jid or from_jid_possiblybare == jid_bare(from_jid)) then return; end
 369
 370         local occupant = room._occupants[to_nick];
 371         for to_jid in pairs(occupant and occupant.sessions or {}) do
 372                 if md5(to_jid) == to_jid_hash then
 373                         return from_nick, to_jid, id;
 374                 end
 375         end
 376 end
 377
 378
 379 function room_mt:handle_to_occupant(origin, stanza) -- PM, vCards, etc
 380         local from, to = stanza.attr.from, stanza.attr.to;
 381         local room = jid_bare(to);
 382         local current_nick = self._jid_nick[from];
 383         local type = stanza.attr.type;
 384         log("debug", "room: %s, current_nick: %s, stanza: %s", room or "nil", current_nick or "nil", stanza:top_tag());
 385         if (select(2, jid_split(from)) == muc_domain) then error("Presence from the MUC itself!!!"); end
 386         if stanza.name == "presence" then
 387                 local pr = get_filtered_presence(stanza);
 388                 pr.attr.from = current_nick;
 389                 if type == "error" then -- error, kick em out!
 390                         if current_nick then
 391                                 log("debug", "kicking %s from %s", current_nick, room);
 392                                 self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza));
 393                         end
 394                 elseif type == "unavailable" then -- unavailable
 395                         if current_nick then
 396                                 log("debug", "%s leaving %s", current_nick, room);
 397                                 self._jid_nick[from] = nil;
 398                                 local occupant = self._occupants[current_nick];
 399                                 local new_jid = next(occupant.sessions);
 400                                 if new_jid == from then new_jid = next(occupant.sessions, new_jid); end
 401                                 if new_jid then
 402                                         local jid = occupant.jid;
 403                                         occupant.jid = new_jid;
 404                                         occupant.sessions[from] = nil;
 405                                         pr.attr.to = from;
 406                                         pr:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 407                                                 :tag("item", {affiliation=occupant.affiliation or "none", role='none'}):up()
 408                                                 :tag("status", {code='110'}):up();
 409                                         self:_route_stanza(pr);
 410                                         if jid ~= new_jid then
 411                                                 pr = st.clone(occupant.sessions[new_jid])
 412                                                         :tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 413                                                         :tag("item", {affiliation=occupant.affiliation or "none", role=occupant.role or "none"});
 414                                                 pr.attr.from = current_nick;
 415                                                 self:broadcast_except_nick(pr, current_nick);
 416                                         end
 417                                 else
 418                                         occupant.role = 'none';
 419                                         self:broadcast_presence(pr, from);
 420                                         self._occupants[current_nick] = nil;
 421                                 end
 422                         end
 423                 elseif not type then -- available
 424                         if current_nick then
 425                                 --if #pr == #stanza or current_nick ~= to then -- commented because google keeps resending directed presence
 426                                         if current_nick == to then -- simple presence
 427                                                 log("debug", "%s broadcasted presence", current_nick);
 428                                                 self._occupants[current_nick].sessions[from] = pr;
 429                                                 self:broadcast_presence(pr, from);
 430                                         else -- change nick
 431                                                 local occupant = self._occupants[current_nick];
 432                                                 local is_multisession = next(occupant.sessions, next(occupant.sessions));
 433                                                 if self._occupants[to] or is_multisession then
 434                                                         log("debug", "%s couldn't change nick", current_nick);
 435                                                         local reply = st.error_reply(stanza, "cancel", "conflict"):up();
 436                                                         reply.tags[1].attr.code = "409";
 437                                                         origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 438                                                 else
 439                                                         local data = self._occupants[current_nick];
 440                                                         local to_nick = select(3, jid_split(to));
 441                                                         if to_nick then
 442                                                                 log("debug", "%s (%s) changing nick to %s", current_nick, data.jid, to);
 443                                                                 local p = st.presence({type='unavailable', from=current_nick});
 444                                                                 self:broadcast_presence(p, from, '303', to_nick);
 445                                                                 self._occupants[current_nick] = nil;
 446                                                                 self._occupants[to] = data;
 447                                                                 self._jid_nick[from] = to;
 448                                                                 pr.attr.from = to;
 449                                                                 self._occupants[to].sessions[from] = pr;
 450                                                                 self:broadcast_presence(pr, from);
 451                                                         else
 452                                                                 --TODO malformed-jid
 453                                                         end
 454                                                 end
 455                                         end
 456                                 --else -- possible rejoin
 457                                 --      log("debug", "%s had connection replaced", current_nick);
 458                                 --      self:handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to})
 459                                 --              :tag('status'):text('Replaced by new connection'):up()); -- send unavailable
 460                                 --      self:handle_to_occupant(origin, stanza); -- resend available
 461                                 --end
 462                         else -- enter room
 463                                 local new_nick = to;
 464                                 local is_merge;
 465                                 if self._occupants[to] then
 466                                         if jid_bare(from) ~= jid_bare(self._occupants[to].jid) then
 467                                                 new_nick = nil;
 468                                         end
 469                                         is_merge = true;
 470                                 end
 471                                 local password = stanza:get_child("x", "http://jabber.org/protocol/muc");
 472                                 password = password and password:get_child("password", "http://jabber.org/protocol/muc");
 473                                 password = password and password[1] ~= "" and password[1];
 474                                 if self:get_password() and self:get_password() ~= password then
 475                                         log("debug", "%s couldn't join due to invalid password: %s", from, to);
 476                                         local reply = st.error_reply(stanza, "auth", "not-authorized"):up();
 477                                         reply.tags[1].attr.code = "401";
 478                                         origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 479                                 elseif not new_nick then
 480                                         log("debug", "%s couldn't join due to nick conflict: %s", from, to);
 481                                         local reply = st.error_reply(stanza, "cancel", "conflict"):up();
 482                                         reply.tags[1].attr.code = "409";
 483                                         origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 484                                 else
 485                                         log("debug", "%s joining as %s", from, to);
 486                                         if not next(self._affiliations) then -- new room, no owners
 487                                                 self._affiliations[jid_bare(from)] = "owner";
 488                                                 if self.locked and not stanza:get_child("x", "http://jabber.org/protocol/muc") then
 489                                                         self.locked = nil; -- Older groupchat protocol doesn't lock
 490                                                 end
 491                                         elseif self.locked then -- Deny entry
 492                                                 origin.send(st.error_reply(stanza, "cancel", "item-not-found"));
 493                                                 return;
 494                                         end
 495                                         local affiliation = self:get_affiliation(from);
 496                                         local role = self:get_default_role(affiliation)
 497                                         if role then -- new occupant
 498                                                 if not is_merge then
 499                                                         self._occupants[to] = {affiliation=affiliation, role=role, jid=from, sessions={[from]=get_filtered_presence(stanza)}};
 500                                                 else
 501                                                         self._occupants[to].sessions[from] = get_filtered_presence(stanza);
 502                                                 end
 503                                                 self._jid_nick[from] = to;
 504                                                 self:send_occupant_list(from);
 505                                                 pr.attr.from = to;
 506                                                 pr:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 507                                                         :tag("item", {affiliation=affiliation or "none", role=role or "none"}):up();
 508                                                 if not is_merge then
 509                                                         self:broadcast_except_nick(pr, to);
 510                                                 end
 511                                                 pr:tag("status", {code='110'}):up();
 512                                                 if self._data.whois == 'anyone' then
 513                                                         pr:tag("status", {code='100'}):up();
 514                                                 end
 515                                                 if self.locked then
 516                                                         pr:tag("status", {code='201'}):up();
 517                                                 end
 518                                                 pr.attr.to = from;
 519                                                 self:_route_stanza(pr);
 520                                                 self:send_history(from, stanza);
 521                                                 self:send_subject(from);
 522                                         elseif not affiliation then -- registration required for entering members-only room
 523                                                 local reply = st.error_reply(stanza, "auth", "registration-required"):up();
 524                                                 reply.tags[1].attr.code = "407";
 525                                                 origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 526                                         else -- banned
 527                                                 local reply = st.error_reply(stanza, "auth", "forbidden"):up();
 528                                                 reply.tags[1].attr.code = "403";
 529                                                 origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 530                                         end
 531                                 end
 532                         end
 533                 elseif type ~= 'result' then -- bad type
 534                         if type ~= 'visible' and type ~= 'invisible' then -- COMPAT ejabberd can broadcast or forward XEP-0018 presences
 535                                 origin.send(st.error_reply(stanza, "modify", "bad-request")); -- FIXME correct error?
 536                         end
 537                 end
 538         elseif not current_nick then -- not in room
 539                 if (type == "error" or type == "result") and stanza.name == "iq" then
 540                         local id = stanza.attr.id;
 541                         stanza.attr.from, stanza.attr.to, stanza.attr.id = deconstruct_stanza_id(self, stanza);
 542                         if stanza.attr.id then
 543                                 self:_route_stanza(stanza);
 544                         end
 545                         stanza.attr.from, stanza.attr.to, stanza.attr.id = from, to, id;
 546                 elseif type ~= "error" then
 547                         origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 548                 end
 549         elseif stanza.name == "message" and type == "groupchat" then -- groupchat messages not allowed in PM
 550                 origin.send(st.error_reply(stanza, "modify", "bad-request"));
 551         elseif current_nick and stanza.name == "message" and type == "error" and is_kickable_error(stanza) then
 552                 log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
 553                 self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza)); -- send unavailable
 554         else -- private stanza
 555                 local o_data = self._occupants[to];
 556                 if o_data then
 557                         log("debug", "%s sent private stanza to %s (%s)", from, to, o_data.jid);
 558                         if stanza.name == "iq" then
 559                                 local id = stanza.attr.id;
 560                                 if stanza.attr.type == "get" or stanza.attr.type == "set" then
 561                                         stanza.attr.from, stanza.attr.to, stanza.attr.id = construct_stanza_id(self, stanza);
 562                                 else
 563                                         stanza.attr.from, stanza.attr.to, stanza.attr.id = deconstruct_stanza_id(self, stanza);
 564                                 end
 565                                 if type == 'get' and stanza.tags[1].attr.xmlns == 'vcard-temp' then
 566                                         stanza.attr.to = jid_bare(stanza.attr.to);
 567                                 end
 568                                 if stanza.attr.id then
 569                                         self:_route_stanza(stanza);
 570                                 end
 571                                 stanza.attr.from, stanza.attr.to, stanza.attr.id = from, to, id;
 572                         else -- message
 573                                 stanza:tag("x", { xmlns = "http://jabber.org/protocol/muc#user" }):up();
 574                                 stanza.attr.from = current_nick;
 575                                 for jid in pairs(o_data.sessions) do
 576                                         stanza.attr.to = jid;
 577                                         self:_route_stanza(stanza);
 578                                 end
 579                                 stanza.attr.from, stanza.attr.to = from, to;
 580                         end
 581                 elseif type ~= "error" and type ~= "result" then -- recipient not in room
 582                         origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Recipient not in room"));
 583                 end
 584         end
 585 end
 586
 587 function room_mt:send_form(origin, stanza)
 588         origin.send(st.reply(stanza):query("http://jabber.org/protocol/muc#owner")
 589                 :add_child(self:get_form_layout(stanza.attr.from):form())
 590         );
 591 end
 592
 593 function room_mt:get_form_layout(actor)
 594         local form = dataform.new({
 595                 title = "Configuration for "..self.jid,
 596                 instructions = "Complete and submit this form to configure the room.",
 597                 {
 598                         name = 'FORM_TYPE',
 599                         type = 'hidden',
 600                         value = 'http://jabber.org/protocol/muc#roomconfig'
 601                 },
 602                 {
 603                         name = 'muc#roomconfig_roomname',
 604                         type = 'text-single',
 605                         label = 'Name',
 606                         value = self:get_name() or "",
 607                 },
 608                 {
 609                         name = 'muc#roomconfig_roomdesc',
 610                         type = 'text-single',
 611                         label = 'Description',
 612                         value = self:get_description() or "",
 613                 },
 614                 {
 615                         name = 'muc#roomconfig_persistentroom',
 616                         type = 'boolean',
 617                         label = 'Make Room Persistent?',
 618                         value = self:get_persistent()
 619                 },
 620                 {
 621                         name = 'muc#roomconfig_publicroom',
 622                         type = 'boolean',
 623                         label = 'Make Room Publicly Searchable?',
 624                         value = not self:get_hidden()
 625                 },
 626                 {
 627                         name = 'muc#roomconfig_changesubject',
 628                         type = 'boolean',
 629                         label = 'Allow Occupants to Change Subject?',
 630                         value = self:get_changesubject()
 631                 },
 632                 {
 633                         name = 'muc#roomconfig_whois',
 634                         type = 'list-single',
 635                         label = 'Who May Discover Real JIDs?',
 636                         value = {
 637                                 { value = 'moderators', label = 'Moderators Only', default = self._data.whois == 'moderators' },
 638                                 { value = 'anyone',     label = 'Anyone',          default = self._data.whois == 'anyone' }
 639                         }
 640                 },
 641                 {
 642                         name = 'muc#roomconfig_roomsecret',
 643                         type = 'text-private',
 644                         label = 'Password',
 645                         value = self:get_password() or "",
 646                 },
 647                 {
 648                         name = 'muc#roomconfig_moderatedroom',
 649                         type = 'boolean',
 650                         label = 'Make Room Moderated?',
 651                         value = self:get_moderated()
 652                 },
 653                 {
 654                         name = 'muc#roomconfig_membersonly',
 655                         type = 'boolean',
 656                         label = 'Make Room Members-Only?',
 657                         value = self:get_members_only()
 658                 },
 659                 {
 660                         name = 'muc#roomconfig_historylength',
 661                         type = 'text-single',
 662                         label = 'Maximum Number of History Messages Returned by Room',
 663                         value = tostring(self:get_historylength())
 664                 }
 665         });
 666         return module:fire_event("muc-config-form", { room = self, actor = actor, form = form }) or form;
 667 end
 668
 669 function room_mt:process_form(origin, stanza)
 670         local query = stanza.tags[1];
 671         local form;
 672         for _, tag in ipairs(query.tags) do if tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then form = tag; break; end end
 673         if not form then origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); return; end
 674         if form.attr.type == "cancel" then origin.send(st.reply(stanza)); return; end
 675         if form.attr.type ~= "submit" then origin.send(st.error_reply(stanza, "cancel", "bad-request", "Not a submitted form")); return; end
 676
 677         local fields = self:get_form_layout(stanza.attr.from):data(form);
 678         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
 679
 680
 681         local changed = {};
 682
 683         local function handle_option(name, field, allowed)
 684                 local new = fields[field];
 685                 if new == nil then return; end
 686                 if allowed and not allowed[new] then return; end
 687                 if new == self["get_"..name](self) then return; end
 688                 changed[name] = true;
 689                 self["set_"..name](self, new);
 690         end
 691
 692         local event = { room = self, fields = fields, changed = changed, stanza = stanza, origin = origin, update_option = handle_option };
 693         module:fire_event("muc-config-submitted", event);
 694
 695         handle_option("name", "muc#roomconfig_roomname");
 696         handle_option("description", "muc#roomconfig_roomdesc");
 697         handle_option("persistent", "muc#roomconfig_persistentroom");
 698         handle_option("moderated", "muc#roomconfig_moderatedroom");
 699         handle_option("members_only", "muc#roomconfig_membersonly");
 700         handle_option("public", "muc#roomconfig_publicroom");
 701         handle_option("changesubject", "muc#roomconfig_changesubject");
 702         handle_option("historylength", "muc#roomconfig_historylength");
 703         handle_option("whois", "muc#roomconfig_whois", valid_whois);
 704         handle_option("password", "muc#roomconfig_roomsecret");
 705
 706         if self.save then self:save(true); end
 707         if self.locked then
 708                 module:fire_event("muc-room-unlocked", { room = self });
 709                 self.locked = nil;
 710         end
 711         origin.send(st.reply(stanza));
 712
 713         if next(changed) then
 714                 local msg = st.message({type='groupchat', from=self.jid})
 715                         :tag('x', {xmlns='http://jabber.org/protocol/muc#user'}):up()
 716                                 :tag('status', {code = '104'}):up();
 717                 if changed.whois then
 718                         local code = (self:get_whois() == 'moderators') and "173" or "172";
 719                         msg.tags[1]:tag('status', {code = code}):up();
 720                 end
 721                 self:broadcast_message(msg, false)
 722         end
 723 end
 724
 725 function room_mt:destroy(newjid, reason, password)
 726         local pr = st.presence({type = "unavailable"})
 727                 :tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 728                         :tag("item", { affiliation='none', role='none' }):up()
 729                         :tag("destroy", {jid=newjid})
 730         if reason then pr:tag("reason"):text(reason):up(); end
 731         if password then pr:tag("password"):text(password):up(); end
 732         for nick, occupant in pairs(self._occupants) do
 733                 pr.attr.from = nick;
 734                 for jid in pairs(occupant.sessions) do
 735                         pr.attr.to = jid;
 736                         self:_route_stanza(pr);
 737                         self._jid_nick[jid] = nil;
 738                 end
 739                 self._occupants[nick] = nil;
 740         end
 741         self:set_persistent(false);
 742         module:fire_event("muc-room-destroyed", { room = self });
 743 end
 744
 745 function room_mt:handle_to_room(origin, stanza) -- presence changes and groupchat messages, along with disco/etc
 746         local type = stanza.attr.type;
 747         local xmlns = stanza.tags[1] and stanza.tags[1].attr.xmlns;
 748         if stanza.name == "iq" then
 749                 if xmlns == "http://jabber.org/protocol/disco#info" and type == "get" and not stanza.tags[1].attr.node then
 750                         origin.send(self:get_disco_info(stanza));
 751                 elseif xmlns == "http://jabber.org/protocol/disco#items" and type == "get" and not stanza.tags[1].attr.node then
 752                         origin.send(self:get_disco_items(stanza));
 753                 elseif xmlns == "http://jabber.org/protocol/muc#admin" then
 754                         local actor = stanza.attr.from;
 755                         local affiliation = self:get_affiliation(actor);
 756                         local current_nick = self._jid_nick[actor];
 757                         local role = current_nick and self._occupants[current_nick].role or self:get_default_role(affiliation);
 758                         local item = stanza.tags[1].tags[1];
 759                         if item and item.name == "item" then
 760                                 if type == "set" then
 761                                         local callback = function() origin.send(st.reply(stanza)); end
 762                                         if item.attr.jid then -- Validate provided JID
 763                                                 item.attr.jid = jid_prep(item.attr.jid);
 764                                                 if not item.attr.jid then
 765                                                         origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
 766                                                         return;
 767                                                 end
 768                                         end
 769                                         if not item.attr.jid and item.attr.nick then -- COMPAT Workaround for Miranda sending 'nick' instead of 'jid' when changing affiliation
 770                                                 local occupant = self._occupants[self.jid.."/"..item.attr.nick];
 771                                                 if occupant then item.attr.jid = occupant.jid; end
 772                                         elseif not item.attr.nick and item.attr.jid then
 773                                                 local nick = self._jid_nick[item.attr.jid];
 774                                                 if nick then item.attr.nick = select(3, jid_split(nick)); end
 775                                         end
 776                                         local reason = item.tags[1] and item.tags[1].name == "reason" and #item.tags[1] == 1 and item.tags[1][1];
 777                                         if item.attr.affiliation and item.attr.jid and not item.attr.role then
 778                                                 local success, errtype, err = self:set_affiliation(actor, item.attr.jid, item.attr.affiliation, callback, reason);
 779                                                 if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 780                                         elseif item.attr.role and item.attr.nick and not item.attr.affiliation then
 781                                                 local success, errtype, err = self:set_role(actor, self.jid.."/"..item.attr.nick, item.attr.role, callback, reason);
 782                                                 if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 783                                         else
 784                                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 785                                         end
 786                                 elseif type == "get" then
 787                                         local _aff = item.attr.affiliation;
 788                                         local _rol = item.attr.role;
 789                                         if _aff and not _rol then
 790                                                 if affiliation == "owner" or (affiliation == "admin" and _aff ~= "owner" and _aff ~= "admin") then
 791                                                         local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 792                                                         for jid, affiliation in pairs(self._affiliations) do
 793                                                                 if affiliation == _aff then
 794                                                                         reply:tag("item", {affiliation = _aff, jid = jid}):up();
 795                                                                 end
 796                                                         end
 797                                                         origin.send(reply);
 798                                                 else
 799                                                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 800                                                 end
 801                                         elseif _rol and not _aff then
 802                                                 if role == "moderator" then
 803                                                         -- TODO allow admins and owners not in room? Provide read-only access to everyone who can see the participants anyway?
 804                                                         if _rol == "none" then _rol = nil; end
 805                                                         local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 806                                                         for occupant_jid, occupant in pairs(self._occupants) do
 807                                                                 if occupant.role == _rol then
 808                                                                         reply:tag("item", {
 809                                                                                 nick = select(3, jid_split(occupant_jid)),
 810                                                                                 role = _rol or "none",
 811                                                                                 affiliation = occupant.affiliation or "none",
 812                                                                                 jid = occupant.jid
 813                                                                                 }):up();
 814                                                                 end
 815                                                         end
 816                                                         origin.send(reply);
 817                                                 else
 818                                                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 819                                                 end
 820                                         else
 821                                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 822                                         end
 823                                 end
 824                         elseif type == "set" or type == "get" then
 825                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 826                         end
 827                 elseif xmlns == "http://jabber.org/protocol/muc#owner" and (type == "get" or type == "set") and stanza.tags[1].name == "query" then
 828                         if self:get_affiliation(stanza.attr.from) ~= "owner" then
 829                                 origin.send(st.error_reply(stanza, "auth", "forbidden", "Only owners can configure rooms"));
 830                         elseif stanza.attr.type == "get" then
 831                                 self:send_form(origin, stanza);
 832                         elseif stanza.attr.type == "set" then
 833                                 local child = stanza.tags[1].tags[1];
 834                                 if not child then
 835                                         origin.send(st.error_reply(stanza, "modify", "bad-request"));
 836                                 elseif child.name == "destroy" then
 837                                         local newjid = child.attr.jid;
 838                                         local reason, password;
 839                                         for _,tag in ipairs(child.tags) do
 840                                                 if tag.name == "reason" then
 841                                                         reason = #tag.tags == 0 and tag[1];
 842                                                 elseif tag.name == "password" then
 843                                                         password = #tag.tags == 0 and tag[1];
 844                                                 end
 845                                         end
 846                                         self:destroy(newjid, reason, password);
 847                                         origin.send(st.reply(stanza));
 848                                 else
 849                                         self:process_form(origin, stanza);
 850                                 end
 851                         end
 852                 elseif type == "set" or type == "get" then
 853                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 854                 end
 855         elseif stanza.name == "message" and type == "groupchat" then
 856                 local from = stanza.attr.from;
 857                 local current_nick = self._jid_nick[from];
 858                 local occupant = self._occupants[current_nick];
 859                 if not occupant then -- not in room
 860                         origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 861                 elseif occupant.role == "visitor" then
 862                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 863                 else
 864                         local from = stanza.attr.from;
 865                         stanza.attr.from = current_nick;
 866                         local subject = stanza:get_child_text("subject");
 867                         if subject then
 868                                 if occupant.role == "moderator" or
 869                                         ( self._data.changesubject and occupant.role == "participant" ) then -- and participant
 870                                         self:set_subject(current_nick, subject);
 871                                 else
 872                                         stanza.attr.from = from;
 873                                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 874                                 end
 875                         else
 876                                 self:broadcast_message(stanza, self:get_historylength() > 0 and stanza:get_child("body"));
 877                         end
 878                         stanza.attr.from = from;
 879                 end
 880         elseif stanza.name == "message" and type == "error" and is_kickable_error(stanza) then
 881                 local current_nick = self._jid_nick[stanza.attr.from];
 882                 log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
 883                 self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza)); -- send unavailable
 884         elseif stanza.name == "presence" then -- hack - some buggy clients send presence updates to the room rather than their nick
 885                 local to = stanza.attr.to;
 886                 local current_nick = self._jid_nick[stanza.attr.from];
 887                 if current_nick then
 888                         stanza.attr.to = current_nick;
 889                         self:handle_to_occupant(origin, stanza);
 890                         stanza.attr.to = to;
 891                 elseif type ~= "error" and type ~= "result" then
 892                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 893                 end
 894         elseif stanza.name == "message" and not(type == "chat" or type == "error" or type == "groupchat" or type == "headline") and #stanza.tags == 1
 895                 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
 896                 local x = stanza.tags[1];
 897                 local payload = (#x.tags == 1 and x.tags[1]);
 898                 if payload and payload.name == "invite" and payload.attr.to then
 899                         local _from, _to = stanza.attr.from, stanza.attr.to;
 900                         local _invitee = jid_prep(payload.attr.to);
 901                         if _invitee then
 902                                 local _reason = payload.tags[1] and payload.tags[1].name == 'reason' and #payload.tags[1].tags == 0 and payload.tags[1][1];
 903                                 local invite = st.message({from = _to, to = _invitee, id = stanza.attr.id})
 904                                         :tag('x', {xmlns='http://jabber.org/protocol/muc#user'})
 905                                                 :tag('invite', {from=_from})
 906                                                         :tag('reason'):text(_reason or ""):up()
 907                                                 :up();
 908                                                 if self:get_password() then
 909                                                         invite:tag("password"):text(self:get_password()):up();
 910                                                 end
 911                                         invite:up()
 912                                         :tag('x', {xmlns="jabber:x:conference", jid=_to}) -- COMPAT: Some older clients expect this
 913                                                 :text(_reason or "")
 914                                         :up()
 915                                         :tag('body') -- Add a plain message for clients which don't support invites
 916                                                 :text(_from..' invited you to the room '.._to..(_reason and (' ('.._reason..')') or ""))
 917                                         :up();
 918                                 if self:get_members_only() and not self:get_affiliation(_invitee) then
 919                                         log("debug", "%s invited %s into members only room %s, granting membership", _from, _invitee, _to);
 920                                         self:set_affiliation(_from, _invitee, "member", nil, "Invited by " .. self._jid_nick[_from])
 921                                 end
 922                                 self:_route_stanza(invite);
 923                         else
 924                                 origin.send(st.error_reply(stanza, "cancel", "jid-malformed"));
 925                         end
 926                 else
 927                         origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 928                 end
 929         else
 930                 if type == "error" or type == "result" then return; end
 931                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 932         end
 933 end
 934
 935 function room_mt:handle_stanza(origin, stanza)
 936         local to_node, to_host, to_resource = jid_split(stanza.attr.to);
 937         if to_resource then
 938                 self:handle_to_occupant(origin, stanza);
 939         else
 940                 self:handle_to_room(origin, stanza);
 941         end
 942 end
 943
 944 function room_mt:route_stanza(stanza) end -- Replace with a routing function, e.g., function(room, stanza) core_route_stanza(origin, stanza); end
 945
 946 function room_mt:get_affiliation(jid)
 947         local node, host, resource = jid_split(jid);
 948         local bare = node and node.."@"..host or host;
 949         local result = self._affiliations[bare]; -- Affiliations are granted, revoked, and maintained based on the user's bare JID.
 950         if not result and self._affiliations[host] == "outcast" then result = "outcast"; end -- host banned
 951         return result;
 952 end
 953 function room_mt:set_affiliation(actor, jid, affiliation, callback, reason)
 954         jid = jid_bare(jid);
 955         if affiliation == "none" then affiliation = nil; end
 956         if affiliation and affiliation ~= "outcast" and affiliation ~= "owner" and affiliation ~= "admin" and affiliation ~= "member" then
 957                 return nil, "modify", "not-acceptable";
 958         end
 959         if actor ~= true then
 960                 local actor_affiliation = self:get_affiliation(actor);
 961                 local target_affiliation = self:get_affiliation(jid);
 962                 if target_affiliation == affiliation then -- no change, shortcut
 963                         if callback then callback(); end
 964                         return true;
 965                 end
 966                 if actor_affiliation ~= "owner" then
 967                         if affiliation == "owner" or affiliation == "admin" or actor_affiliation ~= "admin" or target_affiliation == "owner" or target_affiliation == "admin" then
 968                                 return nil, "cancel", "not-allowed";
 969                         end
 970                 elseif target_affiliation == "owner" and jid_bare(actor) == jid then -- self change
 971                         local is_last = true;
 972                         for j, aff in pairs(self._affiliations) do if j ~= jid and aff == "owner" then is_last = false; break; end end
 973                         if is_last then
 974                                 return nil, "cancel", "conflict";
 975                         end
 976                 end
 977         end
 978         self._affiliations[jid] = affiliation;
 979         local role = self:get_default_role(affiliation);
 980         local x = st.stanza("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 981                         :tag("item", {affiliation=affiliation or "none", role=role or "none"})
 982                                 :tag("reason"):text(reason or ""):up()
 983                         :up();
 984         local presence_type = nil;
 985         if not role then -- getting kicked
 986                 presence_type = "unavailable";
 987                 if affiliation == "outcast" then
 988                         x:tag("status", {code="301"}):up(); -- banned
 989                 else
 990                         x:tag("status", {code="321"}):up(); -- affiliation change
 991                 end
 992         end
 993         local modified_nicks = {};
 994         for nick, occupant in pairs(self._occupants) do
 995                 if jid_bare(occupant.jid) == jid then
 996                         if not role then -- getting kicked
 997                                 self._occupants[nick] = nil;
 998                         else
 999                                 occupant.affiliation, occupant.role = affiliation, role;
1000                         end
1001                         for jid,pres in pairs(occupant.sessions) do -- remove for all sessions of the nick
1002                                 if not role then self._jid_nick[jid] = nil; end
1003                                 local p = st.clone(pres);
1004                                 p.attr.from = nick;
1005                                 p.attr.type = presence_type;
1006                                 p.attr.to = jid;
1007                                 p:add_child(x);
1008                                 self:_route_stanza(p);
1009                                 if occupant.jid == jid then
1010                                         modified_nicks[nick] = p;
1011                                 end
1012                         end
1013                 end
1014         end
1015         if self.save then self:save(); end
1016         if callback then callback(); end
1017         for nick,p in pairs(modified_nicks) do
1018                 p.attr.from = nick;
1019                 self:broadcast_except_nick(p, nick);
1020         end
1021         return true;
1022 end
1023
1024 function room_mt:get_role(nick)
1025         local session = self._occupants[nick];
1026         return session and session.role or nil;
1027 end
1028 function room_mt:can_set_role(actor_jid, occupant_jid, role)
1029         local occupant = self._occupants[occupant_jid];
1030         if not occupant or not actor_jid then return nil, "modify", "not-acceptable"; end
1031
1032         if actor_jid == true then return true; end
1033
1034         local actor = self._occupants[self._jid_nick[actor_jid]];
1035         if actor and 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 = math.min((config and config.history_length)
1132                         or default_history_length, max_history_length);
1133                 };
1134                 _affiliations = {};
1135         }, room_mt);
1136 end
1137
1138 function _M.set_max_history_length(_max_history_length)
1139         max_history_length = _max_history_length or math.huge;
1140 end
1141
1142 _M.room_mt = room_mt;
1143
1144 return _M;