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         local reply = 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         ;
 209         local dataform = dataform.new({
 210                 { name = "FORM_TYPE", type = "hidden", value = "http://jabber.org/protocol/muc#roominfo" },
 211                 { name = "muc#roominfo_description", label = "Description", value = "" },
 212                 { name = "muc#roominfo_occupants", label = "Number of occupants", value = "" }
 213         });
 214         local formdata = {
 215                 ["muc#roominfo_description"] = self:get_description(),
 216                 ["muc#roominfo_occupants"] = tostring(count),
 217         };
 218         module:fire_event("muc-disco#info", { room = self, reply = reply, form = dataform, formdata = formdata });
 219         reply:add_child(dataform:form(formdata, 'result'))
 220         return reply;
 221 end
 222 function room_mt:get_disco_items(stanza)
 223         local reply = st.reply(stanza):query("http://jabber.org/protocol/disco#items");
 224         for room_jid in pairs(self._occupants) do
 225                 reply:tag("item", {jid = room_jid, name = room_jid:match("/(.*)")}):up();
 226         end
 227         return reply;
 228 end
 229 function room_mt:set_subject(current_nick, subject)
 230         if subject == "" then subject = nil; end
 231         self._data['subject'] = subject;
 232         self._data['subject_from'] = current_nick;
 233         if self.save then self:save(); end
 234         local msg = st.message({type='groupchat', from=current_nick})
 235                 :tag('subject'):text(subject):up();
 236         self:broadcast_message(msg, false);
 237         return true;
 238 end
 239
 240 local function build_unavailable_presence_from_error(stanza)
 241         local type, condition, text = stanza:get_error();
 242         local error_message = "Kicked: "..(condition and condition:gsub("%-", " ") or "presence error");
 243         if text then
 244                 error_message = error_message..": "..text;
 245         end
 246         return st.presence({type='unavailable', from=stanza.attr.from, to=stanza.attr.to})
 247                 :tag('status'):text(error_message);
 248 end
 249
 250 function room_mt:set_name(name)
 251         if name == "" or type(name) ~= "string" or name == (jid_split(self.jid)) then name = nil; end
 252         if self._data.name ~= name then
 253                 self._data.name = name;
 254                 if self.save then self:save(true); end
 255         end
 256 end
 257 function room_mt:get_name()
 258         return self._data.name or jid_split(self.jid);
 259 end
 260 function room_mt:set_description(description)
 261         if description == "" or type(description) ~= "string" then description = nil; end
 262         if self._data.description ~= description then
 263                 self._data.description = description;
 264                 if self.save then self:save(true); end
 265         end
 266 end
 267 function room_mt:get_description()
 268         return self._data.description;
 269 end
 270 function room_mt:set_password(password)
 271         if password == "" or type(password) ~= "string" then password = nil; end
 272         if self._data.password ~= password then
 273                 self._data.password = password;
 274                 if self.save then self:save(true); end
 275         end
 276 end
 277 function room_mt:get_password()
 278         return self._data.password;
 279 end
 280 function room_mt:set_moderated(moderated)
 281         moderated = moderated and true or nil;
 282         if self._data.moderated ~= moderated then
 283                 self._data.moderated = moderated;
 284                 if self.save then self:save(true); end
 285         end
 286 end
 287 function room_mt:get_moderated()
 288         return self._data.moderated;
 289 end
 290 function room_mt:set_members_only(members_only)
 291         members_only = members_only and true or nil;
 292         if self._data.members_only ~= members_only then
 293                 self._data.members_only = members_only;
 294                 if self.save then self:save(true); end
 295         end
 296 end
 297 function room_mt:get_members_only()
 298         return self._data.members_only;
 299 end
 300 function room_mt:set_persistent(persistent)
 301         persistent = persistent and true or nil;
 302         if self._data.persistent ~= persistent then
 303                 self._data.persistent = persistent;
 304                 if self.save then self:save(true); end
 305         end
 306 end
 307 function room_mt:get_persistent()
 308         return self._data.persistent;
 309 end
 310 function room_mt:set_hidden(hidden)
 311         hidden = hidden and true or nil;
 312         if self._data.hidden ~= hidden then
 313                 self._data.hidden = hidden;
 314                 if self.save then self:save(true); end
 315         end
 316 end
 317 function room_mt:get_hidden()
 318         return self._data.hidden;
 319 end
 320 function room_mt:get_public()
 321         return not self:get_hidden();
 322 end
 323 function room_mt:set_public(public)
 324         return self:set_hidden(not public);
 325 end
 326 function room_mt:set_changesubject(changesubject)
 327         changesubject = changesubject and true or nil;
 328         if self._data.changesubject ~= changesubject then
 329                 self._data.changesubject = changesubject;
 330                 if self.save then self:save(true); end
 331         end
 332 end
 333 function room_mt:get_changesubject()
 334         return self._data.changesubject;
 335 end
 336 function room_mt:get_historylength()
 337         return self._data.history_length or default_history_length;
 338 end
 339 function room_mt:set_historylength(length)
 340         length = math.min(tonumber(length) or default_history_length, max_history_length or math.huge);
 341         if length == default_history_length then
 342                 length = nil;
 343         end
 344         self._data.history_length = length;
 345 end
 346
 347
 348 local valid_whois = { moderators = true, anyone = true };
 349
 350 function room_mt:set_whois(whois)
 351         if valid_whois[whois] and self._data.whois ~= whois then
 352                 self._data.whois = whois;
 353                 if self.save then self:save(true); end
 354         end
 355 end
 356
 357 function room_mt:get_whois()
 358         return self._data.whois;
 359 end
 360
 361 local function construct_stanza_id(room, stanza)
 362         local from_jid, to_nick = stanza.attr.from, stanza.attr.to;
 363         local from_nick = room._jid_nick[from_jid];
 364         local occupant = room._occupants[to_nick];
 365         local to_jid = occupant.jid;
 366
 367         return from_nick, to_jid, base64.encode(to_jid.."\0"..stanza.attr.id.."\0"..md5(from_jid));
 368 end
 369 local function deconstruct_stanza_id(room, stanza)
 370         local from_jid_possiblybare, to_nick = stanza.attr.from, stanza.attr.to;
 371         local from_jid, id, to_jid_hash = (base64.decode(stanza.attr.id) or ""):match("^(%Z+)%z(%Z*)%z(.+)$");
 372         local from_nick = room._jid_nick[from_jid];
 373
 374         if not(from_nick) then return; end
 375         if not(from_jid_possiblybare == from_jid or from_jid_possiblybare == jid_bare(from_jid)) then return; end
 376
 377         local occupant = room._occupants[to_nick];
 378         for to_jid in pairs(occupant and occupant.sessions or {}) do
 379                 if md5(to_jid) == to_jid_hash then
 380                         return from_nick, to_jid, id;
 381                 end
 382         end
 383 end
 384
 385
 386 function room_mt:handle_to_occupant(origin, stanza) -- PM, vCards, etc
 387         local from, to = stanza.attr.from, stanza.attr.to;
 388         local room = jid_bare(to);
 389         local current_nick = self._jid_nick[from];
 390         local type = stanza.attr.type;
 391         log("debug", "room: %s, current_nick: %s, stanza: %s", room or "nil", current_nick or "nil", stanza:top_tag());
 392         if (select(2, jid_split(from)) == muc_domain) then error("Presence from the MUC itself!!!"); end
 393         if stanza.name == "presence" then
 394                 local pr = get_filtered_presence(stanza);
 395                 pr.attr.from = current_nick;
 396                 if type == "error" then -- error, kick em out!
 397                         if current_nick then
 398                                 log("debug", "kicking %s from %s", current_nick, room);
 399                                 self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza));
 400                         end
 401                 elseif type == "unavailable" then -- unavailable
 402                         if current_nick then
 403                                 log("debug", "%s leaving %s", current_nick, room);
 404                                 self._jid_nick[from] = nil;
 405                                 local occupant = self._occupants[current_nick];
 406                                 local new_jid = next(occupant.sessions);
 407                                 if new_jid == from then new_jid = next(occupant.sessions, new_jid); end
 408                                 if new_jid then
 409                                         local jid = occupant.jid;
 410                                         occupant.jid = new_jid;
 411                                         occupant.sessions[from] = nil;
 412                                         pr.attr.to = from;
 413                                         pr:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 414                                                 :tag("item", {affiliation=occupant.affiliation or "none", role='none'}):up()
 415                                                 :tag("status", {code='110'}):up();
 416                                         self:_route_stanza(pr);
 417                                         if jid ~= new_jid then
 418                                                 pr = st.clone(occupant.sessions[new_jid])
 419                                                         :tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 420                                                         :tag("item", {affiliation=occupant.affiliation or "none", role=occupant.role or "none"});
 421                                                 pr.attr.from = current_nick;
 422                                                 self:broadcast_except_nick(pr, current_nick);
 423                                         end
 424                                 else
 425                                         occupant.role = 'none';
 426                                         self:broadcast_presence(pr, from);
 427                                         self._occupants[current_nick] = nil;
 428                                 end
 429                         end
 430                 elseif not type then -- available
 431                         if current_nick then
 432                                 --if #pr == #stanza or current_nick ~= to then -- commented because google keeps resending directed presence
 433                                         if current_nick == to then -- simple presence
 434                                                 log("debug", "%s broadcasted presence", current_nick);
 435                                                 self._occupants[current_nick].sessions[from] = pr;
 436                                                 self:broadcast_presence(pr, from);
 437                                         else -- change nick
 438                                                 local occupant = self._occupants[current_nick];
 439                                                 local is_multisession = next(occupant.sessions, next(occupant.sessions));
 440                                                 if self._occupants[to] or is_multisession then
 441                                                         log("debug", "%s couldn't change nick", current_nick);
 442                                                         local reply = st.error_reply(stanza, "cancel", "conflict"):up();
 443                                                         reply.tags[1].attr.code = "409";
 444                                                         origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 445                                                 else
 446                                                         local data = self._occupants[current_nick];
 447                                                         local to_nick = select(3, jid_split(to));
 448                                                         if to_nick then
 449                                                                 log("debug", "%s (%s) changing nick to %s", current_nick, data.jid, to);
 450                                                                 local p = st.presence({type='unavailable', from=current_nick});
 451                                                                 self:broadcast_presence(p, from, '303', to_nick);
 452                                                                 self._occupants[current_nick] = nil;
 453                                                                 self._occupants[to] = data;
 454                                                                 self._jid_nick[from] = to;
 455                                                                 pr.attr.from = to;
 456                                                                 self._occupants[to].sessions[from] = pr;
 457                                                                 self:broadcast_presence(pr, from);
 458                                                         else
 459                                                                 --TODO malformed-jid
 460                                                         end
 461                                                 end
 462                                         end
 463                                 --else -- possible rejoin
 464                                 --      log("debug", "%s had connection replaced", current_nick);
 465                                 --      self:handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to})
 466                                 --              :tag('status'):text('Replaced by new connection'):up()); -- send unavailable
 467                                 --      self:handle_to_occupant(origin, stanza); -- resend available
 468                                 --end
 469                         else -- enter room
 470                                 local new_nick = to;
 471                                 local is_merge;
 472                                 if self._occupants[to] then
 473                                         if jid_bare(from) ~= jid_bare(self._occupants[to].jid) then
 474                                                 new_nick = nil;
 475                                         end
 476                                         is_merge = true;
 477                                 end
 478                                 local password = stanza:get_child("x", "http://jabber.org/protocol/muc");
 479                                 password = password and password:get_child("password", "http://jabber.org/protocol/muc");
 480                                 password = password and password[1] ~= "" and password[1];
 481                                 if self:get_password() and self:get_password() ~= password then
 482                                         log("debug", "%s couldn't join due to invalid password: %s", from, to);
 483                                         local reply = st.error_reply(stanza, "auth", "not-authorized"):up();
 484                                         reply.tags[1].attr.code = "401";
 485                                         origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 486                                 elseif not new_nick then
 487                                         log("debug", "%s couldn't join due to nick conflict: %s", from, to);
 488                                         local reply = st.error_reply(stanza, "cancel", "conflict"):up();
 489                                         reply.tags[1].attr.code = "409";
 490                                         origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 491                                 else
 492                                         log("debug", "%s joining as %s", from, to);
 493                                         if not next(self._affiliations) then -- new room, no owners
 494                                                 self._affiliations[jid_bare(from)] = "owner";
 495                                                 if self.locked and not stanza:get_child("x", "http://jabber.org/protocol/muc") then
 496                                                         self.locked = nil; -- Older groupchat protocol doesn't lock
 497                                                 end
 498                                         elseif self.locked then -- Deny entry
 499                                                 origin.send(st.error_reply(stanza, "cancel", "item-not-found"));
 500                                                 return;
 501                                         end
 502                                         local affiliation = self:get_affiliation(from);
 503                                         local role = self:get_default_role(affiliation)
 504                                         if role then -- new occupant
 505                                                 if not is_merge then
 506                                                         self._occupants[to] = {affiliation=affiliation, role=role, jid=from, sessions={[from]=get_filtered_presence(stanza)}};
 507                                                 else
 508                                                         self._occupants[to].sessions[from] = get_filtered_presence(stanza);
 509                                                 end
 510                                                 self._jid_nick[from] = to;
 511                                                 self:send_occupant_list(from);
 512                                                 pr.attr.from = to;
 513                                                 pr:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 514                                                         :tag("item", {affiliation=affiliation or "none", role=role or "none"}):up();
 515                                                 if not is_merge then
 516                                                         self:broadcast_except_nick(pr, to);
 517                                                 end
 518                                                 pr:tag("status", {code='110'}):up();
 519                                                 if self._data.whois == 'anyone' then
 520                                                         pr:tag("status", {code='100'}):up();
 521                                                 end
 522                                                 if self.locked then
 523                                                         pr:tag("status", {code='201'}):up();
 524                                                 end
 525                                                 pr.attr.to = from;
 526                                                 self:_route_stanza(pr);
 527                                                 self:send_history(from, stanza);
 528                                                 self:send_subject(from);
 529                                         elseif not affiliation then -- registration required for entering members-only room
 530                                                 local reply = st.error_reply(stanza, "auth", "registration-required"):up();
 531                                                 reply.tags[1].attr.code = "407";
 532                                                 origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 533                                         else -- banned
 534                                                 local reply = st.error_reply(stanza, "auth", "forbidden"):up();
 535                                                 reply.tags[1].attr.code = "403";
 536                                                 origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 537                                         end
 538                                 end
 539                         end
 540                 elseif type ~= 'result' then -- bad type
 541                         if type ~= 'visible' and type ~= 'invisible' then -- COMPAT ejabberd can broadcast or forward XEP-0018 presences
 542                                 origin.send(st.error_reply(stanza, "modify", "bad-request")); -- FIXME correct error?
 543                         end
 544                 end
 545         elseif not current_nick then -- not in room
 546                 if (type == "error" or type == "result") and stanza.name == "iq" then
 547                         local id = stanza.attr.id;
 548                         stanza.attr.from, stanza.attr.to, stanza.attr.id = deconstruct_stanza_id(self, stanza);
 549                         if stanza.attr.id then
 550                                 self:_route_stanza(stanza);
 551                         end
 552                         stanza.attr.from, stanza.attr.to, stanza.attr.id = from, to, id;
 553                 elseif type ~= "error" then
 554                         origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 555                 end
 556         elseif stanza.name == "message" and type == "groupchat" then -- groupchat messages not allowed in PM
 557                 origin.send(st.error_reply(stanza, "modify", "bad-request"));
 558         elseif current_nick and stanza.name == "message" and type == "error" and is_kickable_error(stanza) then
 559                 log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
 560                 self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza)); -- send unavailable
 561         else -- private stanza
 562                 local o_data = self._occupants[to];
 563                 if o_data then
 564                         log("debug", "%s sent private stanza to %s (%s)", from, to, o_data.jid);
 565                         if stanza.name == "iq" then
 566                                 local id = stanza.attr.id;
 567                                 if stanza.attr.type == "get" or stanza.attr.type == "set" then
 568                                         stanza.attr.from, stanza.attr.to, stanza.attr.id = construct_stanza_id(self, stanza);
 569                                 else
 570                                         stanza.attr.from, stanza.attr.to, stanza.attr.id = deconstruct_stanza_id(self, stanza);
 571                                 end
 572                                 if type == 'get' and stanza.tags[1].attr.xmlns == 'vcard-temp' then
 573                                         stanza.attr.to = jid_bare(stanza.attr.to);
 574                                 end
 575                                 if stanza.attr.id then
 576                                         self:_route_stanza(stanza);
 577                                 end
 578                                 stanza.attr.from, stanza.attr.to, stanza.attr.id = from, to, id;
 579                         else -- message
 580                                 stanza:tag("x", { xmlns = "http://jabber.org/protocol/muc#user" }):up();
 581                                 stanza.attr.from = current_nick;
 582                                 for jid in pairs(o_data.sessions) do
 583                                         stanza.attr.to = jid;
 584                                         self:_route_stanza(stanza);
 585                                 end
 586                                 stanza.attr.from, stanza.attr.to = from, to;
 587                         end
 588                 elseif type ~= "error" and type ~= "result" then -- recipient not in room
 589                         origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Recipient not in room"));
 590                 end
 591         end
 592 end
 593
 594 function room_mt:send_form(origin, stanza)
 595         origin.send(st.reply(stanza):query("http://jabber.org/protocol/muc#owner")
 596                 :add_child(self:get_form_layout(stanza.attr.from):form())
 597         );
 598 end
 599
 600 function room_mt:get_form_layout(actor)
 601         local form = dataform.new({
 602                 title = "Configuration for "..self.jid,
 603                 instructions = "Complete and submit this form to configure the room.",
 604                 {
 605                         name = 'FORM_TYPE',
 606                         type = 'hidden',
 607                         value = 'http://jabber.org/protocol/muc#roomconfig'
 608                 },
 609                 {
 610                         name = 'muc#roomconfig_roomname',
 611                         type = 'text-single',
 612                         label = 'Name',
 613                         value = self:get_name() or "",
 614                 },
 615                 {
 616                         name = 'muc#roomconfig_roomdesc',
 617                         type = 'text-single',
 618                         label = 'Description',
 619                         value = self:get_description() or "",
 620                 },
 621                 {
 622                         name = 'muc#roomconfig_persistentroom',
 623                         type = 'boolean',
 624                         label = 'Make Room Persistent?',
 625                         value = self:get_persistent()
 626                 },
 627                 {
 628                         name = 'muc#roomconfig_publicroom',
 629                         type = 'boolean',
 630                         label = 'Make Room Publicly Searchable?',
 631                         value = not self:get_hidden()
 632                 },
 633                 {
 634                         name = 'muc#roomconfig_changesubject',
 635                         type = 'boolean',
 636                         label = 'Allow Occupants to Change Subject?',
 637                         value = self:get_changesubject()
 638                 },
 639                 {
 640                         name = 'muc#roomconfig_whois',
 641                         type = 'list-single',
 642                         label = 'Who May Discover Real JIDs?',
 643                         value = {
 644                                 { value = 'moderators', label = 'Moderators Only', default = self._data.whois == 'moderators' },
 645                                 { value = 'anyone',     label = 'Anyone',          default = self._data.whois == 'anyone' }
 646                         }
 647                 },
 648                 {
 649                         name = 'muc#roomconfig_roomsecret',
 650                         type = 'text-private',
 651                         label = 'Password',
 652                         value = self:get_password() or "",
 653                 },
 654                 {
 655                         name = 'muc#roomconfig_moderatedroom',
 656                         type = 'boolean',
 657                         label = 'Make Room Moderated?',
 658                         value = self:get_moderated()
 659                 },
 660                 {
 661                         name = 'muc#roomconfig_membersonly',
 662                         type = 'boolean',
 663                         label = 'Make Room Members-Only?',
 664                         value = self:get_members_only()
 665                 },
 666                 {
 667                         name = 'muc#roomconfig_historylength',
 668                         type = 'text-single',
 669                         label = 'Maximum Number of History Messages Returned by Room',
 670                         value = tostring(self:get_historylength())
 671                 }
 672         });
 673         return module:fire_event("muc-config-form", { room = self, actor = actor, form = form }) or form;
 674 end
 675
 676 function room_mt:process_form(origin, stanza)
 677         local query = stanza.tags[1];
 678         local form;
 679         for _, tag in ipairs(query.tags) do if tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then form = tag; break; end end
 680         if not form then origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); return; end
 681         if form.attr.type == "cancel" then origin.send(st.reply(stanza)); return; end
 682         if form.attr.type ~= "submit" then origin.send(st.error_reply(stanza, "cancel", "bad-request", "Not a submitted form")); return; end
 683
 684         if form.tags[1] == nil then
 685                 -- instant room
 686                 if self.save then self:save(true); end
 687                 origin.send(st.reply(stanza));
 688                 return true;
 689         end
 690
 691         local fields, errors, present = self:get_form_layout(stanza.attr.from):data(form);
 692         if fields.FORM_TYPE ~= "http://jabber.org/protocol/muc#roomconfig" then
 693                 origin.send(st.error_reply(stanza, "cancel", "bad-request", "Form is not of type room configuration"));
 694                 return;
 695         end
 696
 697         local changed = {};
 698
 699         local function handle_option(name, field, allowed)
 700                 if not present[field] then return; end
 701                 local new = fields[field];
 702                 if allowed and not allowed[new] then return; end
 703                 if new == self["get_"..name](self) then return; end
 704                 changed[name] = true;
 705                 self["set_"..name](self, new);
 706         end
 707
 708         local event = { room = self, fields = fields, changed = changed, stanza = stanza, origin = origin, update_option = handle_option };
 709         module:fire_event("muc-config-submitted", event);
 710
 711         handle_option("name", "muc#roomconfig_roomname");
 712         handle_option("description", "muc#roomconfig_roomdesc");
 713         handle_option("persistent", "muc#roomconfig_persistentroom");
 714         handle_option("moderated", "muc#roomconfig_moderatedroom");
 715         handle_option("members_only", "muc#roomconfig_membersonly");
 716         handle_option("public", "muc#roomconfig_publicroom");
 717         handle_option("changesubject", "muc#roomconfig_changesubject");
 718         handle_option("historylength", "muc#roomconfig_historylength");
 719         handle_option("whois", "muc#roomconfig_whois", valid_whois);
 720         handle_option("password", "muc#roomconfig_roomsecret");
 721
 722         if self.save then self:save(true); end
 723         if self.locked then
 724                 module:fire_event("muc-room-unlocked", { room = self });
 725                 self.locked = nil;
 726         end
 727         origin.send(st.reply(stanza));
 728
 729         if next(changed) then
 730                 local msg = st.message({type='groupchat', from=self.jid})
 731                         :tag('x', {xmlns='http://jabber.org/protocol/muc#user'})
 732                                 :tag('status', {code = '104'}):up();
 733                 if changed.whois then
 734                         local code = (self:get_whois() == 'moderators') and "173" or "172";
 735                         msg.tags[1]:tag('status', {code = code}):up();
 736                 end
 737                 self:broadcast_message(msg, false)
 738         end
 739 end
 740
 741 function room_mt:destroy(newjid, reason, password)
 742         local pr = st.presence({type = "unavailable"})
 743                 :tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 744                         :tag("item", { affiliation='none', role='none' }):up()
 745                         :tag("destroy", {jid=newjid})
 746         if reason then pr:tag("reason"):text(reason):up(); end
 747         if password then pr:tag("password"):text(password):up(); end
 748         for nick, occupant in pairs(self._occupants) do
 749                 pr.attr.from = nick;
 750                 for jid in pairs(occupant.sessions) do
 751                         pr.attr.to = jid;
 752                         self:_route_stanza(pr);
 753                         self._jid_nick[jid] = nil;
 754                 end
 755                 self._occupants[nick] = nil;
 756         end
 757         self:set_persistent(false);
 758         module:fire_event("muc-room-destroyed", { room = self });
 759 end
 760
 761 function room_mt:handle_to_room(origin, stanza) -- presence changes and groupchat messages, along with disco/etc
 762         local type = stanza.attr.type;
 763         local xmlns = stanza.tags[1] and stanza.tags[1].attr.xmlns;
 764         if stanza.name == "iq" then
 765                 if xmlns == "http://jabber.org/protocol/disco#info" and type == "get" and not stanza.tags[1].attr.node then
 766                         origin.send(self:get_disco_info(stanza));
 767                 elseif xmlns == "http://jabber.org/protocol/disco#items" and type == "get" and not stanza.tags[1].attr.node then
 768                         origin.send(self:get_disco_items(stanza));
 769                 elseif xmlns == "http://jabber.org/protocol/muc#admin" then
 770                         local actor = stanza.attr.from;
 771                         local affiliation = self:get_affiliation(actor);
 772                         local current_nick = self._jid_nick[actor];
 773                         local role = current_nick and self._occupants[current_nick].role or self:get_default_role(affiliation);
 774                         local item = stanza.tags[1].tags[1];
 775                         if item and item.name == "item" then
 776                                 if type == "set" then
 777                                         local callback = function() origin.send(st.reply(stanza)); end
 778                                         if item.attr.jid then -- Validate provided JID
 779                                                 item.attr.jid = jid_prep(item.attr.jid);
 780                                                 if not item.attr.jid then
 781                                                         origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
 782                                                         return;
 783                                                 end
 784                                         end
 785                                         if not item.attr.jid and item.attr.nick then -- COMPAT Workaround for Miranda sending 'nick' instead of 'jid' when changing affiliation
 786                                                 local occupant = self._occupants[self.jid.."/"..item.attr.nick];
 787                                                 if occupant then item.attr.jid = occupant.jid; end
 788                                         elseif not item.attr.nick and item.attr.jid then
 789                                                 local nick = self._jid_nick[item.attr.jid];
 790                                                 if nick then item.attr.nick = select(3, jid_split(nick)); end
 791                                         end
 792                                         local reason = item.tags[1] and item.tags[1].name == "reason" and #item.tags[1] == 1 and item.tags[1][1];
 793                                         if item.attr.affiliation and item.attr.jid and not item.attr.role then
 794                                                 local success, errtype, err = self:set_affiliation(actor, item.attr.jid, item.attr.affiliation, callback, reason);
 795                                                 if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 796                                         elseif item.attr.role and item.attr.nick and not item.attr.affiliation then
 797                                                 local success, errtype, err = self:set_role(actor, self.jid.."/"..item.attr.nick, item.attr.role, callback, reason);
 798                                                 if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 799                                         else
 800                                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 801                                         end
 802                                 elseif type == "get" then
 803                                         local _aff = item.attr.affiliation;
 804                                         local _rol = item.attr.role;
 805                                         if _aff and not _rol then
 806                                                 if affiliation == "owner" or (affiliation == "admin" and _aff ~= "owner" and _aff ~= "admin")
 807                                                 or (affiliation and affiliation ~= "outcast" and self:get_members_only() and self:get_whois() == "anyone") then
 808                                                         local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 809                                                         for jid, affiliation in pairs(self._affiliations) do
 810                                                                 if affiliation == _aff then
 811                                                                         reply:tag("item", {affiliation = _aff, jid = jid}):up();
 812                                                                 end
 813                                                         end
 814                                                         origin.send(reply);
 815                                                 else
 816                                                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 817                                                 end
 818                                         elseif _rol and not _aff then
 819                                                 if role == "moderator" then
 820                                                         -- TODO allow admins and owners not in room? Provide read-only access to everyone who can see the participants anyway?
 821                                                         if _rol == "none" then _rol = nil; end
 822                                                         local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 823                                                         for occupant_jid, occupant in pairs(self._occupants) do
 824                                                                 if occupant.role == _rol then
 825                                                                         reply:tag("item", {
 826                                                                                 nick = select(3, jid_split(occupant_jid)),
 827                                                                                 role = _rol or "none",
 828                                                                                 affiliation = occupant.affiliation or "none",
 829                                                                                 jid = occupant.jid
 830                                                                                 }):up();
 831                                                                 end
 832                                                         end
 833                                                         origin.send(reply);
 834                                                 else
 835                                                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 836                                                 end
 837                                         else
 838                                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 839                                         end
 840                                 end
 841                         elseif type == "set" or type == "get" then
 842                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 843                         end
 844                 elseif xmlns == "http://jabber.org/protocol/muc#owner" and (type == "get" or type == "set") and stanza.tags[1].name == "query" then
 845                         if self:get_affiliation(stanza.attr.from) ~= "owner" then
 846                                 origin.send(st.error_reply(stanza, "auth", "forbidden", "Only owners can configure rooms"));
 847                         elseif stanza.attr.type == "get" then
 848                                 self:send_form(origin, stanza);
 849                         elseif stanza.attr.type == "set" then
 850                                 local child = stanza.tags[1].tags[1];
 851                                 if not child then
 852                                         origin.send(st.error_reply(stanza, "modify", "bad-request"));
 853                                 elseif child.name == "destroy" then
 854                                         local newjid = child.attr.jid;
 855                                         local reason, password;
 856                                         for _,tag in ipairs(child.tags) do
 857                                                 if tag.name == "reason" then
 858                                                         reason = #tag.tags == 0 and tag[1];
 859                                                 elseif tag.name == "password" then
 860                                                         password = #tag.tags == 0 and tag[1];
 861                                                 end
 862                                         end
 863                                         self:destroy(newjid, reason, password);
 864                                         origin.send(st.reply(stanza));
 865                                 else
 866                                         self:process_form(origin, stanza);
 867                                 end
 868                         end
 869                 elseif type == "set" or type == "get" then
 870                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 871                 end
 872         elseif stanza.name == "message" and type == "groupchat" then
 873                 local from = stanza.attr.from;
 874                 local current_nick = self._jid_nick[from];
 875                 local occupant = self._occupants[current_nick];
 876                 if not occupant then -- not in room
 877                         origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 878                 elseif occupant.role == "visitor" then
 879                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 880                 else
 881                         local from = stanza.attr.from;
 882                         stanza.attr.from = current_nick;
 883                         local subject = stanza:get_child_text("subject");
 884                         if subject then
 885                                 if occupant.role == "moderator" or
 886                                         ( self._data.changesubject and occupant.role == "participant" ) then -- and participant
 887                                         self:set_subject(current_nick, subject);
 888                                 else
 889                                         stanza.attr.from = from;
 890                                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 891                                 end
 892                         else
 893                                 self:broadcast_message(stanza, self:get_historylength() > 0 and stanza:get_child("body"));
 894                         end
 895                         stanza.attr.from = from;
 896                 end
 897         elseif stanza.name == "message" and type == "error" and is_kickable_error(stanza) then
 898                 local current_nick = self._jid_nick[stanza.attr.from];
 899                 log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
 900                 self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza)); -- send unavailable
 901         elseif stanza.name == "presence" then -- hack - some buggy clients send presence updates to the room rather than their nick
 902                 local to = stanza.attr.to;
 903                 local current_nick = self._jid_nick[stanza.attr.from];
 904                 if current_nick then
 905                         stanza.attr.to = current_nick;
 906                         self:handle_to_occupant(origin, stanza);
 907                         stanza.attr.to = to;
 908                 elseif type ~= "error" and type ~= "result" then
 909                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 910                 end
 911         elseif stanza.name == "message" and not(type == "chat" or type == "error" or type == "groupchat" or type == "headline") and #stanza.tags == 1
 912                 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
 913                 local x = stanza.tags[1];
 914                 local payload = (#x.tags == 1 and x.tags[1]);
 915                 if payload and payload.name == "invite" and payload.attr.to then
 916                         local _from, _to = stanza.attr.from, stanza.attr.to;
 917                         local _invitee = jid_prep(payload.attr.to);
 918                         if _invitee then
 919                                 local _reason = payload.tags[1] and payload.tags[1].name == 'reason' and #payload.tags[1].tags == 0 and payload.tags[1][1];
 920                                 local invite = st.message({from = _to, to = _invitee, id = stanza.attr.id})
 921                                         :tag('x', {xmlns='http://jabber.org/protocol/muc#user'})
 922                                                 :tag('invite', {from=_from})
 923                                                         :tag('reason'):text(_reason or ""):up()
 924                                                 :up();
 925                                                 if self:get_password() then
 926                                                         invite:tag("password"):text(self:get_password()):up();
 927                                                 end
 928                                         invite:up()
 929                                         :tag('x', {xmlns="jabber:x:conference", jid=_to}) -- COMPAT: Some older clients expect this
 930                                                 :text(_reason or "")
 931                                         :up()
 932                                         :tag('body') -- Add a plain message for clients which don't support invites
 933                                                 :text(_from..' invited you to the room '.._to..(_reason and (' ('.._reason..')') or ""))
 934                                         :up();
 935                                 if self:get_members_only() and not self:get_affiliation(_invitee) then
 936                                         log("debug", "%s invited %s into members only room %s, granting membership", _from, _invitee, _to);
 937                                         self:set_affiliation(_from, _invitee, "member", nil, "Invited by " .. self._jid_nick[_from])
 938                                 end
 939                                 self:_route_stanza(invite);
 940                         else
 941                                 origin.send(st.error_reply(stanza, "cancel", "jid-malformed"));
 942                         end
 943                 else
 944                         origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 945                 end
 946         else
 947                 if type == "error" or type == "result" then return; end
 948                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 949         end
 950 end
 951
 952 function room_mt:handle_stanza(origin, stanza)
 953         local to_node, to_host, to_resource = jid_split(stanza.attr.to);
 954         if to_resource then
 955                 self:handle_to_occupant(origin, stanza);
 956         else
 957                 self:handle_to_room(origin, stanza);
 958         end
 959 end
 960
 961 function room_mt:route_stanza(stanza) end -- Replace with a routing function, e.g., function(room, stanza) core_route_stanza(origin, stanza); end
 962
 963 function room_mt:get_affiliation(jid)
 964         local node, host, resource = jid_split(jid);
 965         local bare = node and node.."@"..host or host;
 966         local result = self._affiliations[bare]; -- Affiliations are granted, revoked, and maintained based on the user's bare JID.
 967         if not result and self._affiliations[host] == "outcast" then result = "outcast"; end -- host banned
 968         return result;
 969 end
 970 function room_mt:set_affiliation(actor, jid, affiliation, callback, reason)
 971         jid = jid_bare(jid);
 972         if affiliation == "none" then affiliation = nil; end
 973         if affiliation and affiliation ~= "outcast" and affiliation ~= "owner" and affiliation ~= "admin" and affiliation ~= "member" then
 974                 return nil, "modify", "not-acceptable";
 975         end
 976         if actor ~= true then
 977                 local actor_affiliation = self:get_affiliation(actor);
 978                 local target_affiliation = self:get_affiliation(jid);
 979                 if target_affiliation == affiliation then -- no change, shortcut
 980                         if callback then callback(); end
 981                         return true;
 982                 end
 983                 if actor_affiliation ~= "owner" then
 984                         if affiliation == "owner" or affiliation == "admin" or actor_affiliation ~= "admin" or target_affiliation == "owner" or target_affiliation == "admin" then
 985                                 return nil, "cancel", "not-allowed";
 986                         end
 987                 elseif target_affiliation == "owner" and jid_bare(actor) == jid then -- self change
 988                         local is_last = true;
 989                         for j, aff in pairs(self._affiliations) do if j ~= jid and aff == "owner" then is_last = false; break; end end
 990                         if is_last then
 991                                 return nil, "cancel", "conflict";
 992                         end
 993                 end
 994         end
 995         self._affiliations[jid] = affiliation;
 996         local role = self:get_default_role(affiliation);
 997         local x = st.stanza("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 998                         :tag("item", {affiliation=affiliation or "none", role=role or "none"})
 999                                 :tag("reason"):text(reason or ""):up()
1000                         :up();
1001         local presence_type = nil;
1002         if not role then -- getting kicked
1003                 presence_type = "unavailable";
1004                 if affiliation == "outcast" then
1005                         x:tag("status", {code="301"}):up(); -- banned
1006                 else
1007                         x:tag("status", {code="321"}):up(); -- affiliation change
1008                 end
1009         end
1010         local modified_nicks = {};
1011         for nick, occupant in pairs(self._occupants) do
1012                 if jid_bare(occupant.jid) == jid then
1013                         if not role then -- getting kicked
1014                                 self._occupants[nick] = nil;
1015                         else
1016                                 occupant.affiliation, occupant.role = affiliation, role;
1017                         end
1018                         for jid,pres in pairs(occupant.sessions) do -- remove for all sessions of the nick
1019                                 if not role then self._jid_nick[jid] = nil; end
1020                                 local p = st.clone(pres);
1021                                 p.attr.from = nick;
1022                                 p.attr.type = presence_type;
1023                                 p.attr.to = jid;
1024                                 p:add_child(x);
1025                                 self:_route_stanza(p);
1026                                 if occupant.jid == jid then
1027                                         modified_nicks[nick] = p;
1028                                 end
1029                         end
1030                 end
1031         end
1032         if self.save then self:save(); end
1033         if callback then callback(); end
1034         for nick,p in pairs(modified_nicks) do
1035                 p.attr.from = nick;
1036                 self:broadcast_except_nick(p, nick);
1037         end
1038         return true;
1039 end
1040
1041 function room_mt:get_role(nick)
1042         local session = self._occupants[nick];
1043         return session and session.role or nil;
1044 end
1045 function room_mt:can_set_role(actor_jid, occupant_jid, role)
1046         local occupant = self._occupants[occupant_jid];
1047         if not occupant or not actor_jid then return nil, "modify", "not-acceptable"; end
1048
1049         if actor_jid == true then return true; end
1050
1051         local actor = self._occupants[self._jid_nick[actor_jid]];
1052         if actor and actor.role == "moderator" then
1053                 if occupant.affiliation ~= "owner" and occupant.affiliation ~= "admin" then
1054                         if actor.affiliation == "owner" or actor.affiliation == "admin" then
1055                                 return true;
1056                         elseif occupant.role ~= "moderator" and role ~= "moderator" then
1057                                 return true;
1058                         end
1059                 end
1060         end
1061         return nil, "cancel", "not-allowed";
1062 end
1063 function room_mt:set_role(actor, occupant_jid, role, callback, reason)
1064         if role == "none" then role = nil; end
1065         if role and role ~= "moderator" and role ~= "participant" and role ~= "visitor" then return nil, "modify", "not-acceptable"; end
1066         local allowed, err_type, err_condition = self:can_set_role(actor, occupant_jid, role);
1067         if not allowed then return allowed, err_type, err_condition; end
1068         local occupant = self._occupants[occupant_jid];
1069         local x = st.stanza("x", {xmlns = "http://jabber.org/protocol/muc#user"})
1070                         :tag("item", {affiliation=occupant.affiliation or "none", nick=select(3, jid_split(occupant_jid)), role=role or "none"})
1071                                 :tag("reason"):text(reason or ""):up()
1072                         :up();
1073         local presence_type = nil;
1074         if not role then -- kick
1075                 presence_type = "unavailable";
1076                 self._occupants[occupant_jid] = nil;
1077                 for jid in pairs(occupant.sessions) do -- remove for all sessions of the nick
1078                         self._jid_nick[jid] = nil;
1079                 end
1080                 x:tag("status", {code = "307"}):up();
1081         else
1082                 occupant.role = role;
1083         end
1084         local bp;
1085         for jid,pres in pairs(occupant.sessions) do -- send to all sessions of the nick
1086                 local p = st.clone(pres);
1087                 p.attr.from = occupant_jid;
1088                 p.attr.type = presence_type;
1089                 p.attr.to = jid;
1090                 p:add_child(x);
1091                 self:_route_stanza(p);
1092                 if occupant.jid == jid then
1093                         bp = p;
1094                 end
1095         end
1096         if callback then callback(); end
1097         if bp then
1098                 self:broadcast_except_nick(bp, occupant_jid);
1099         end
1100         return true;
1101 end
1102
1103 function room_mt:_route_stanza(stanza)
1104         local muc_child;
1105         local to_occupant = self._occupants[self._jid_nick[stanza.attr.to]];
1106         local from_occupant = self._occupants[stanza.attr.from];
1107         if stanza.name == "presence" then
1108                 if to_occupant and from_occupant then
1109                         if self._data.whois == 'anyone' then
1110                             muc_child = stanza:get_child("x", "http://jabber.org/protocol/muc#user");
1111                         else
1112                                 if to_occupant.role == "moderator" or jid_bare(to_occupant.jid) == jid_bare(from_occupant.jid) then
1113                                         muc_child = stanza:get_child("x", "http://jabber.org/protocol/muc#user");
1114                                 end
1115                         end
1116                 end
1117         end
1118         if muc_child then
1119                 for _, item in pairs(muc_child.tags) do
1120                         if item.name == "item" then
1121                                 if from_occupant == to_occupant then
1122                                         item.attr.jid = stanza.attr.to;
1123                                 else
1124                                         item.attr.jid = from_occupant.jid;
1125                                 end
1126                         end
1127                 end
1128         end
1129         self:route_stanza(stanza);
1130         if muc_child then
1131                 for _, item in pairs(muc_child.tags) do
1132                         if item.name == "item" then
1133                                 item.attr.jid = nil;
1134                         end
1135                 end
1136         end
1137 end
1138
1139 local _M = {}; -- module "muc"
1140
1141 function _M.new_room(jid, config)
1142         return setmetatable({
1143                 jid = jid;
1144                 _jid_nick = {};
1145                 _occupants = {};
1146                 _data = {
1147                     whois = 'moderators';
1148                     history_length = math.min((config and config.history_length)
1149                         or default_history_length, max_history_length);
1150                 };
1151                 _affiliations = {};
1152         }, room_mt);
1153 end
1154
1155 function _M.set_max_history_length(_max_history_length)
1156         max_history_length = _max_history_length or math.huge;
1157 end
1158
1159 _M.room_mt = room_mt;
1160
1161 return _M;