plugins/muc/muc.lib.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 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 datamanager = require "util.datamanager";
  10 local datetime = require "util.datetime";
  11
  12 local jid_split = require "util.jid".split;
  13 local jid_bare = require "util.jid".bare;
  14 local st = require "util.stanza";
  15 local log = require "util.logger".init("mod_muc");
  16 local multitable_new = require "util.multitable".new;
  17 local t_insert, t_remove = table.insert, table.remove;
  18 local setmetatable = setmetatable;
  19
  20 local muc_domain = nil; --module:get_host();
  21 local history_length = 20;
  22
  23 ------------
  24 local function filter_xmlns_from_array(array, filters)
  25         local count = 0;
  26         for i=#array,1,-1 do
  27                 local attr = array[i].attr;
  28                 if filters[attr and attr.xmlns] then
  29                         t_remove(array, i);
  30                         count = count + 1;
  31                 end
  32         end
  33         return count;
  34 end
  35 local function filter_xmlns_from_stanza(stanza, filters)
  36         if filters then
  37                 if filter_xmlns_from_array(stanza.tags, filters) ~= 0 then
  38                         return stanza, filter_xmlns_from_array(stanza, filters);
  39                 end
  40         end
  41         return stanza, 0;
  42 end
  43 local presence_filters = {["http://jabber.org/protocol/muc"]=true;["http://jabber.org/protocol/muc#user"]=true};
  44 local function get_filtered_presence(stanza)
  45         return filter_xmlns_from_stanza(st.clone(stanza), presence_filters);
  46 end
  47 local kickable_error_conditions = {
  48         ["gone"] = true;
  49         ["internal-server-error"] = true;
  50         ["item-not-found"] = true;
  51         ["jid-malformed"] = true;
  52         ["recipient-unavailable"] = true;
  53         ["redirect"] = true;
  54         ["remote-server-not-found"] = true;
  55         ["remote-server-timeout"] = true;
  56         ["service-unavailable"] = true;
  57 };
  58 local function get_kickable_error(stanza)
  59         for _, tag in ipairs(stanza.tags) do
  60                 if tag.name == "error" and tag.attr.xmlns == "jabber:client" then
  61                         for _, cond in ipairs(tag.tags) do
  62                                 if cond.attr.xmlns == "urn:ietf:params:xml:ns:xmpp-stanzas" then
  63                                         return kickable_error_conditions[cond.name] and cond.name;
  64                                 end
  65                         end
  66                         return true; -- malformed error message
  67                 end
  68         end
  69         return true; -- malformed error message
  70 end
  71 local function getUsingPath(stanza, path, getText)
  72         local tag = stanza;
  73         for _, name in ipairs(path) do
  74                 if type(tag) ~= 'table' then return; end
  75                 tag = tag:child_with_name(name);
  76         end
  77         if tag and getText then tag = table.concat(tag); end
  78         return tag;
  79 end
  80 local function getTag(stanza, path) return getUsingPath(stanza, path); end
  81 local function getText(stanza, path) return getUsingPath(stanza, path, true); end
  82 -----------
  83
  84 --[[function get_room_disco_info(room, stanza)
  85         return st.iq({type='result', id=stanza.attr.id, from=stanza.attr.to, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#info")
  86                 :tag("identity", {category='conference', type='text', name=room._data["name"]):up()
  87                 :tag("feature", {var="http://jabber.org/protocol/muc"}); -- TODO cache disco reply
  88 end
  89 function get_room_disco_items(room, stanza)
  90         return st.iq({type='result', id=stanza.attr.id, from=stanza.attr.to, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#items");
  91 end -- TODO allow non-private rooms]]
  92
  93 --
  94
  95 local room_mt = {};
  96 room_mt.__index = room_mt;
  97
  98 function room_mt:get_default_role(affiliation)
  99         if affiliation == "owner" or affiliation == "admin" then
 100                 return "moderator";
 101         elseif affiliation == "member" or not affiliation then
 102                 return "participant";
 103         end
 104 end
 105
 106 function room_mt:broadcast_presence(stanza, code, nick)
 107         stanza = get_filtered_presence(stanza);
 108         local data = self._occupants[stanza.attr.from];
 109         stanza:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 110                 :tag("item", {affiliation=data.affiliation, role=data.role, nick=nick}):up();
 111         if code then
 112                 stanza:tag("status", {code=code}):up();
 113         end
 114         local me;
 115         for occupant, o_data in pairs(self._occupants) do
 116                 if occupant ~= stanza.attr.from then
 117                         for jid in pairs(o_data.sessions) do
 118                                 stanza.attr.to = jid;
 119                                 self:route_stanza(stanza);
 120                         end
 121                 else
 122                         me = o_data;
 123                 end
 124         end
 125         if me then
 126                 stanza:tag("status", {code='110'});
 127                 for jid in pairs(me.sessions) do
 128                         stanza.attr.to = jid;
 129                         self:route_stanza(stanza);
 130                 end
 131         end
 132 end
 133 function room_mt:broadcast_message(stanza, historic)
 134         for occupant, o_data in pairs(self._occupants) do
 135                 for jid in pairs(o_data.sessions) do
 136                         stanza.attr.to = jid;
 137                         self:route_stanza(stanza);
 138                 end
 139         end
 140         if historic then -- add to history
 141                 local history = self._data['history'];
 142                 if not history then history = {}; self._data['history'] = history; end
 143                 -- stanza = st.clone(stanza);
 144                 stanza:tag("delay", {xmlns = "urn:xmpp:delay", from = muc_domain, stamp = datetime.datetime()}):up(); -- XEP-0203
 145                 stanza:tag("x", {xmlns = "jabber:x:delay", from = muc_domain, stamp = datetime.legacy()}):up(); -- XEP-0091 (deprecated)
 146                 t_insert(history, st.clone(st.preserialize(stanza)));
 147                 while #history > history_length do t_remove(history, 1) end
 148         end
 149 end
 150 function room_mt:broadcast_except_nick(stanza, nick)
 151         for rnick, occupant in pairs(self._occupants) do
 152                 if rnick ~= nick then
 153                         for jid in pairs(occupant.sessions) do
 154                                 stanza.attr.to = jid;
 155                                 self:route_stanza(stanza);
 156                         end
 157                 end
 158         end
 159 end
 160
 161 function room_mt:send_occupant_list(to)
 162         local current_nick = self._jid_nick[to];
 163         for occupant, o_data in pairs(self._occupants) do
 164                 if occupant ~= current_nick then
 165                         local pres = get_filtered_presence(o_data.sessions[o_data.jid]);
 166                         pres.attr.to, pres.attr.from = to, occupant;
 167                         pres:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 168                                 :tag("item", {affiliation=o_data.affiliation, role=o_data.role}):up();
 169                         self:route_stanza(pres);
 170                 end
 171         end
 172 end
 173 function room_mt:send_history(to)
 174         local history = self._data['history']; -- send discussion history
 175         if history then
 176                 for _, msg in ipairs(history) do
 177                         msg = st.deserialize(msg);
 178                         msg.attr.to=to;
 179                         self:route_stanza(msg);
 180                 end
 181         end
 182         if self._data['subject'] then
 183                 self:route_stanza(st.message({type='groupchat', from=self.jid, to=to}):tag("subject"):text(self._data['subject']));
 184         end
 185 end
 186
 187 local function room_get_disco_info(self, stanza) end
 188 local function room_get_disco_items(self, stanza) end
 189 function room_mt:set_subject(current_nick, subject)
 190         -- TODO check nick's authority
 191         if subject == "" then subject = nil; end
 192         self._data['subject'] = subject;
 193         local msg = st.message({type='groupchat', from=current_nick})
 194                 :tag('subject'):text(subject):up();
 195         self:broadcast_message(msg, false);
 196         return true;
 197 end
 198
 199 function room_mt:handle_to_occupant(origin, stanza) -- PM, vCards, etc
 200         local from, to = stanza.attr.from, stanza.attr.to;
 201         local room = jid_bare(to);
 202         local current_nick = self._jid_nick[from];
 203         local type = stanza.attr.type;
 204         log("debug", "room: %s, current_nick: %s, stanza: %s", room or "nil", current_nick or "nil", stanza:top_tag());
 205         if (select(2, jid_split(from)) == muc_domain) then error("Presence from the MUC itself!!!"); end
 206         if stanza.name == "presence" then
 207                 local pr = get_filtered_presence(stanza);
 208                 pr.attr.from = current_nick;
 209                 if type == "error" then -- error, kick em out!
 210                         if current_nick then
 211                                 log("debug", "kicking %s from %s", current_nick, room);
 212                                 self:handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to})
 213                                         :tag('status'):text('This participant is kicked from the room because he sent an error presence')); -- send unavailable
 214                         end
 215                 elseif type == "unavailable" then -- unavailable
 216                         if current_nick then
 217                                 log("debug", "%s leaving %s", current_nick, room);
 218                                 local data = self._occupants[current_nick];
 219                                 data.role = 'none';
 220                                 self:broadcast_presence(pr);
 221                                 self._occupants[current_nick] = nil;
 222                                 self._jid_nick[from] = nil;
 223                         end
 224                 elseif not type then -- available
 225                         if current_nick then
 226                                 --if #pr == #stanza or current_nick ~= to then -- commented because google keeps resending directed presence
 227                                         if current_nick == to then -- simple presence
 228                                                 log("debug", "%s broadcasted presence", current_nick);
 229                                                 self._occupants[current_nick].sessions[from] = pr;
 230                                                 self:broadcast_presence(pr);
 231                                         else -- change nick
 232                                                 if self._occupants[to] then
 233                                                         log("debug", "%s couldn't change nick", current_nick);
 234                                                         origin.send(st.error_reply(stanza, "cancel", "conflict"):tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 235                                                 else
 236                                                         local data = self._occupants[current_nick];
 237                                                         local to_nick = select(3, jid_split(to));
 238                                                         if to_nick then
 239                                                                 log("debug", "%s (%s) changing nick to %s", current_nick, data.jid, to);
 240                                                                 local p = st.presence({type='unavailable', from=current_nick});
 241                                                                 self:broadcast_presence(p, '303', to_nick);
 242                                                                 self._occupants[current_nick] = nil;
 243                                                                 self._occupants[to] = data;
 244                                                                 self._jid_nick[from] = to;
 245                                                                 pr.attr.from = to;
 246                                                                 self._occupants[to].sessions[from] = pr;
 247                                                                 self:broadcast_presence(pr);
 248                                                         else
 249                                                                 --TODO malformed-jid
 250                                                         end
 251                                                 end
 252                                         end
 253                                 --else -- possible rejoin
 254                                 --      log("debug", "%s had connection replaced", current_nick);
 255                                 --      self:handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to})
 256                                 --              :tag('status'):text('Replaced by new connection'):up()); -- send unavailable
 257                                 --      self:handle_to_occupant(origin, stanza); -- resend available
 258                                 --end
 259                         else -- enter room
 260                                 local new_nick = to;
 261                                 if self._occupants[to] then
 262                                         new_nick = nil;
 263                                 end
 264                                 if not new_nick then
 265                                         log("debug", "%s couldn't join due to nick conflict: %s", from, to);
 266                                         origin.send(st.error_reply(stanza, "cancel", "conflict"):tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 267                                 else
 268                                         log("debug", "%s joining as %s", from, to);
 269                                         if not next(self._affiliations) then -- new room, no owners
 270                                                 self._affiliations[jid_bare(from)] = "owner";
 271                                         end
 272                                         local affiliation = self:get_affiliation(from);
 273                                         local role = self:get_default_role(affiliation)
 274                                         if role then -- new occupant
 275                                                 self._occupants[to] = {affiliation=affiliation, role=role, jid=from, sessions={[from]=get_filtered_presence(stanza)}};
 276                                                 self._jid_nick[from] = to;
 277                                                 self:send_occupant_list(from);
 278                                                 pr.attr.from = to;
 279                                                 self:broadcast_presence(pr);
 280                                                 self:send_history(from);
 281                                         else -- banned
 282                                                 origin.send(st.error_reply(stanza, "auth", "forbidden"):tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 283                                         end
 284                                 end
 285                         end
 286                 elseif type ~= 'result' then -- bad type
 287                         origin.send(st.error_reply(stanza, "modify", "bad-request")); -- FIXME correct error?
 288                 end
 289         elseif not current_nick and type ~= "error" and type ~= "result" then -- not in room
 290                 origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 291         elseif stanza.name == "message" and type == "groupchat" then -- groupchat messages not allowed in PM
 292                 origin.send(st.error_reply(stanza, "modify", "bad-request"));
 293         elseif stanza.name == "message" and type == "error" and get_kickable_error(stanza) then
 294                 log("debug", "%s kicked from %s for sending an error message", current_nick, room);
 295                 self:handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to}):tag('status'):text('This participant is kicked from the room because he sent an error message to another occupant')); -- send unavailable
 296         else -- private stanza
 297                 local o_data = self._occupants[to];
 298                 if o_data then
 299                         log("debug", "%s sent private stanza to %s (%s)", from, to, o_data.jid);
 300                         local jid = o_data.jid;
 301                         -- TODO if stanza.name=='iq' and type=='get' and stanza.tags[1].attr.xmlns == 'vcard-temp' then jid = jid_bare(jid); end
 302                         stanza.attr.to, stanza.attr.from = jid, current_nick;
 303                         self:route_stanza(stanza);
 304                 elseif type ~= "error" and type ~= "result" then -- recipient not in room
 305                         origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Recipient not in room"));
 306                 end
 307         end
 308 end
 309
 310 function room_mt:handle_to_room(origin, stanza) -- presence changes and groupchat messages, along with disco/etc
 311         local type = stanza.attr.type;
 312         local xmlns = stanza.tags[1] and stanza.tags[1].attr.xmlns;
 313         if stanza.name == "iq" and type == "get" and xmlns ~= "http://jabber.org/protocol/muc#admin" then -- disco requests
 314                 if xmlns == "http://jabber.org/protocol/disco#info" then
 315                         origin.send(room_get_disco_info(self, stanza));
 316                 elseif xmlns == "http://jabber.org/protocol/disco#items" then
 317                         origin.send(room_get_disco_items(self, stanza));
 318                 else
 319                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 320                 end
 321         elseif stanza.name == "iq" and xmlns == "http://jabber.org/protocol/muc#admin" then
 322                 local actor = stanza.attr.from;
 323                 local affiliation = self:get_affiliation(actor);
 324                 local current_nick = self._jid_nick[actor];
 325                 local role = current_nick and self._occupants[current_nick].role or self:get_default_role(affiliation);
 326                 local item = stanza.tags[1].tags[1];
 327                 if item and item.name == "item" then
 328                         if type == "set" then
 329                                 local callback = function() origin.send(st.reply(stanza)); end
 330                                 if not item.attr.jid and item.attr.nick then -- COMPAT Workaround for Miranda sending 'nick' instead of 'jid' when changing affiliation
 331                                         local occupant = self._occupants[self.jid.."/"..item.attr.nick];
 332                                         if occupant then item.attr.jid = occupant.jid; end
 333                                 end
 334                                 if item.attr.affiliation and item.attr.jid and not item.attr.role then
 335                                         local success, errtype, err = self:set_affiliation(actor, item.attr.jid, item.attr.affiliation, callback);
 336                                         if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 337                                 elseif item.attr.role and item.attr.nick and not item.attr.affiliation then
 338                                         local success, errtype, err = self:set_role(actor, self.jid.."/"..item.attr.nick, item.attr.role, callback);
 339                                         if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 340                                 else
 341                                         origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 342                                 end
 343                         elseif type == "get" then
 344                                 local _aff = item.attr.affiliation;
 345                                 local _rol = item.attr.role;
 346                                 if _aff and not _rol then
 347                                         if affiliation == "owner" or (affiliation == "admin" and _aff ~= "owner" and _aff ~= "admin") then
 348                                                 local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 349                                                 for jid, affiliation in pairs(self._affiliations) do
 350                                                         if affiliation == _aff then
 351                                                                 reply:tag("item", {affiliation = _aff, jid = jid}):up();
 352                                                         end
 353                                                 end
 354                                                 origin.send(reply);
 355                                         else
 356                                                 origin.send(st.error_reply(stanza, "auth", "forbidden"));
 357                                         end
 358                                 elseif _rol and not _aff then
 359                                         if role == "moderator" then -- TODO allow admins and owners not in room? Provide read-only access to everyone who can see the participants anyway?
 360                                                 if _rol == "none" then _rol = nil; end
 361                                                 local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 362                                                 for nick, occupant in pairs(self._occupants) do
 363                                                         if occupant.role == _rol then
 364                                                                 reply:tag("item", {nick = nick, role = _rol or "none", affiliation = occupant.affiliation or "none", jid = occupant.jid}):up();
 365                                                         end
 366                                                 end
 367                                                 origin.send(reply);
 368                                         else
 369                                                 origin.send(st.error_reply(stanza, "auth", "forbidden"));
 370                                         end
 371                                 else
 372                                         origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 373                                 end
 374                         end
 375                 elseif type == "set" or type == "get" then
 376                         origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 377                 end
 378         elseif stanza.name == "message" and type == "groupchat" then
 379                 local from, to = stanza.attr.from, stanza.attr.to;
 380                 local room = jid_bare(to);
 381                 local current_nick = self._jid_nick[from];
 382                 if not current_nick then -- not in room
 383                         origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 384                 else
 385                         local from = stanza.attr.from;
 386                         stanza.attr.from = current_nick;
 387                         local subject = getText(stanza, {"subject"});
 388                         if subject then
 389                                 self:set_subject(current_nick, subject); -- TODO use broadcast_message_stanza
 390                         else
 391                                 self:broadcast_message(stanza, true);
 392                         end
 393                 end
 394         elseif stanza.name == "presence" then -- hack - some buggy clients send presence updates to the room rather than their nick
 395                 local to = stanza.attr.to;
 396                 local current_nick = self._jid_nick[stanza.attr.from];
 397                 if current_nick then
 398                         stanza.attr.to = current_nick;
 399                         self:handle_to_occupant(origin, stanza);
 400                         stanza.attr.to = to;
 401                 elseif type ~= "error" and type ~= "result" then
 402                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 403                 end
 404         elseif stanza.name == "message" and not stanza.attr.type and #stanza.tags == 1 and self._jid_nick[stanza.attr.from]
 405                 and stanza.tags[1].name == "x" and stanza.tags[1].attr.xmlns == "http://jabber.org/protocol/muc#user" and #stanza.tags[1].tags == 1
 406                 and stanza.tags[1].tags[1].name == "invite" and stanza.tags[1].tags[1].attr.to then
 407                 local _from, _to = stanza.attr.from, stanza.attr.to;
 408                 local _invitee = stanza.tags[1].tags[1].attr.to;
 409                 stanza.attr.from, stanza.attr.to = _to, _invitee;
 410                 stanza.tags[1].tags[1].attr.from, stanza.tags[1].tags[1].attr.to = _from, nil;
 411                 self:route_stanza(stanza);
 412                 stanza.tags[1].tags[1].attr.from, stanza.tags[1].tags[1].attr.to = nil, _invitee;
 413                 stanza.attr.from, stanza.attr.to = _from, _to;
 414         else
 415                 if type == "error" or type == "result" then return; end
 416                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 417         end
 418 end
 419
 420 function room_mt:handle_stanza(origin, stanza)
 421         local to_node, to_host, to_resource = jid_split(stanza.attr.to);
 422         if to_resource then
 423                 self:handle_to_occupant(origin, stanza);
 424         else
 425                 self:handle_to_room(origin, stanza);
 426         end
 427 end
 428
 429 function room_mt:route_stanza(stanza) end -- Replace with a routing function, e.g., function(room, stanza) core_route_stanza(origin, stanza); end
 430
 431 function room_mt:get_affiliation(jid)
 432         local node, host, resource = jid_split(jid);
 433         local bare = node and node.."@"..host or host;
 434         local result = self._affiliations[bare]; -- Affiliations are granted, revoked, and maintained based on the user's bare JID.
 435         if not result and self._affiliations[host] == "outcast" then result = "outcast"; end -- host banned
 436         return result;
 437 end
 438 function room_mt:set_affiliation(actor, jid, affiliation, callback)
 439         jid = jid_bare(jid);
 440         if affiliation == "none" then affiliation = nil; end
 441         if affiliation and affiliation ~= "outcast" and affiliation ~= "owner" and affiliation ~= "admin" and affiliation ~= "member" then
 442                 return nil, "modify", "not-acceptable";
 443         end
 444         if self:get_affiliation(actor) ~= "owner" then return nil, "cancel", "not-allowed"; end
 445         if jid_bare(actor) == jid then return nil, "cancel", "not-allowed"; end
 446         self._affiliations[jid] = affiliation;
 447         local role = self:get_default_role(affiliation);
 448         local p = st.presence()
 449                 :tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 450                         :tag("item", {affiliation=affiliation or "none", role=role or "none"}):up();
 451         local x = p.tags[1];
 452         local item = x.tags[1];
 453         if not role then -- getting kicked
 454                 p.attr.type = "unavailable";
 455                 if affiliation == "outcast" then
 456                         x:tag("status", {code="301"}):up(); -- banned
 457                 else
 458                         x:tag("status", {code="321"}):up(); -- affiliation change
 459                 end
 460         end
 461         local modified_nicks = {};
 462         for nick, occupant in pairs(self._occupants) do
 463                 if jid_bare(occupant.jid) == jid then
 464                         if not role then -- getting kicked
 465                                 self._occupants[nick] = nil;
 466                         else
 467                                 t_insert(modified_nicks, nick);
 468                                 occupant.affiliation, occupant.role = affiliation, role;
 469                         end
 470                         p.attr.from = nick;
 471                         for jid in pairs(occupant.sessions) do -- remove for all sessions of the nick
 472                                 if not role then self._jid_nick[jid] = nil; end
 473                                 p.attr.to = jid;
 474                                 self:route_stanza(p);
 475                         end
 476                 end
 477         end
 478         if callback then callback(); end
 479         for _, nick in ipairs(modified_nicks) do
 480                 p.attr.from = nick;
 481                 self:broadcast_except_nick(p, nick);
 482         end
 483         return true;
 484 end
 485
 486 function room_mt:get_role(nick)
 487         local session = self._occupants[nick];
 488         return session and session.role or nil;
 489 end
 490 function room_mt:set_role(actor, nick, role, callback)
 491         if role and role ~= "moderator" and role ~= "participant" and role ~= "visitor" then return nil, "modify", "not-acceptable"; end
 492         if self:get_affiliation(actor) ~= "owner" then return nil, "cancel", "not-allowed"; end
 493         local occupant = self._occupants[nick];
 494         if not occupant then return nil, "modify", "not-acceptable"; end
 495         if occupant.affiliation == "owner" or occupant.affiliation == "admin" then return nil, "cancel", "not-allowed"; end
 496         local p = st.presence({from = nick})
 497                 :tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 498                         :tag("item", {affiliation=occupant.affiliation or "none", nick=nick, role=role or "none"}):up();
 499         if not role then -- kick
 500                 p.attr.type = "unavailable";
 501                 self._occupants[nick] = nil;
 502                 for jid in pairs(occupant.sessions) do -- remove for all sessions of the nick
 503                         self._jid_nick[jid] = nil;
 504                 end
 505                 p:tag("status", {code = "307"}):up();
 506         else
 507                 occupant.role = role;
 508         end
 509         for jid in pairs(occupant.sessions) do -- send to all sessions of the nick
 510                 p.attr.to = jid;
 511                 self:route_stanza(p);
 512         end
 513         if callback then callback(); end
 514         self:broadcast_except_nick(p, nick);
 515         return true;
 516 end
 517
 518 local _M = {}; -- module "muc"
 519
 520 function _M.new_room(jid)
 521         return setmetatable({
 522                 jid = jid;
 523                 _jid_nick = {};
 524                 _occupants = {};
 525                 _data = {};
 526                 _affiliations = {};
 527         }, room_mt);
 528 end
 529
 530 return _M;
 531
 532 --[[function get_disco_info(stanza)
 533         return st.iq({type='result', id=stanza.attr.id, from=muc_domain, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#info")
 534                 :tag("identity", {category='conference', type='text', name=muc_name}):up()
 535                 :tag("feature", {var="http://jabber.org/protocol/muc"}); -- TODO cache disco reply
 536 end
 537 function get_disco_items(stanza)
 538         local reply = st.iq({type='result', id=stanza.attr.id, from=muc_domain, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#items");
 539         for room in pairs(rooms_info:get()) do
 540                 reply:tag("item", {jid=room, name=rooms_info:get(room, "name")}):up();
 541         end
 542         return reply; -- TODO cache disco reply
 543 end]]
 544
 545 --[[function handle_to_domain(origin, stanza)
 546         local type = stanza.attr.type;
 547         if type == "error" or type == "result" then return; end
 548         if stanza.name == "iq" and type == "get" then
 549                 local xmlns = stanza.tags[1].attr.xmlns;
 550                 if xmlns == "http://jabber.org/protocol/disco#info" then
 551                         origin.send(get_disco_info(stanza));
 552                 elseif xmlns == "http://jabber.org/protocol/disco#items" then
 553                         origin.send(get_disco_items(stanza));
 554                 else
 555                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- TODO disco/etc
 556                 end
 557         else
 558                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable", "The muc server doesn't deal with messages and presence directed at it"));
 559         end
 560 end
 561
 562 register_component(muc_domain, function(origin, stanza)
 563         local to_node, to_host, to_resource = jid_split(stanza.attr.to);
 564         if to_resource and not to_node then
 565                 if type == "error" or type == "result" then return; end
 566                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- host/resource
 567         elseif to_resource then
 568                 handle_to_occupant(origin, stanza);
 569         elseif to_node then
 570                 handle_to_room(origin, stanza)
 571         else -- to the main muc domain
 572                 if type == "error" or type == "result" then return; end
 573                 handle_to_domain(origin, stanza);
 574         end
 575 end);]]
 576
 577 --[[module.unload = function()
 578         deregister_component(muc_domain);
 579 end
 580 module.save = function()
 581         return {rooms = rooms.data; jid_nick = jid_nick.data; rooms_info = rooms_info.data; persist_list = persist_list};
 582 end
 583 module.restore = function(data)
 584         rooms.data, jid_nick.data, rooms_info.data, persist_list =
 585         data.rooms or {}, data.jid_nick or {}, data.rooms_info or {}, data.persist_list or {};
 586 end]]