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 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 jid_prep = require "util.jid".prep;
  15 local st = require "util.stanza";
  16 local log = require "util.logger".init("mod_muc");
  17 local multitable_new = require "util.multitable".new;
  18 local t_insert, t_remove = table.insert, table.remove;
  19 local setmetatable = setmetatable;
  20 local base64 = require "util.encodings".base64;
  21 local md5 = require "util.hashes".md5;
  22
  23 local muc_domain = nil; --module:get_host();
  24 local history_length = 20;
  25
  26 ------------
  27 local function filter_xmlns_from_array(array, filters)
  28         local count = 0;
  29         for i=#array,1,-1 do
  30                 local attr = array[i].attr;
  31                 if filters[attr and attr.xmlns] then
  32                         t_remove(array, i);
  33                         count = count + 1;
  34                 end
  35         end
  36         return count;
  37 end
  38 local function filter_xmlns_from_stanza(stanza, filters)
  39         if filters then
  40                 if filter_xmlns_from_array(stanza.tags, filters) ~= 0 then
  41                         return stanza, filter_xmlns_from_array(stanza, filters);
  42                 end
  43         end
  44         return stanza, 0;
  45 end
  46 local presence_filters = {["http://jabber.org/protocol/muc"]=true;["http://jabber.org/protocol/muc#user"]=true};
  47 local function get_filtered_presence(stanza)
  48         return filter_xmlns_from_stanza(st.clone(stanza):reset(), presence_filters);
  49 end
  50 local kickable_error_conditions = {
  51         ["gone"] = true;
  52         ["internal-server-error"] = true;
  53         ["item-not-found"] = true;
  54         ["jid-malformed"] = true;
  55         ["recipient-unavailable"] = true;
  56         ["redirect"] = true;
  57         ["remote-server-not-found"] = true;
  58         ["remote-server-timeout"] = true;
  59         ["service-unavailable"] = true;
  60         ["malformed error"] = true;
  61 };
  62
  63 local function get_error_condition(stanza)
  64         local _, condition = stanza:get_error();
  65         return condition or "malformed error";
  66 end
  67
  68 local function is_kickable_error(stanza)
  69         local cond = get_error_condition(stanza);
  70         return kickable_error_conditions[cond] and cond;
  71 end
  72 local function getUsingPath(stanza, path, getText)
  73         local tag = stanza;
  74         for _, name in ipairs(path) do
  75                 if type(tag) ~= 'table' then return; end
  76                 tag = tag:child_with_name(name);
  77         end
  78         if tag and getText then tag = table.concat(tag); end
  79         return tag;
  80 end
  81 local function getTag(stanza, path) return getUsingPath(stanza, path); end
  82 local function getText(stanza, path) return getUsingPath(stanza, path, true); end
  83 -----------
  84
  85 local room_mt = {};
  86 room_mt.__index = room_mt;
  87
  88 function room_mt:get_default_role(affiliation)
  89         if affiliation == "owner" or affiliation == "admin" then
  90                 return "moderator";
  91         elseif affiliation == "member" or not affiliation then
  92                 return "participant";
  93         end
  94 end
  95
  96 function room_mt:broadcast_presence(stanza, sid, code, nick)
  97         stanza = get_filtered_presence(stanza);
  98         local occupant = self._occupants[stanza.attr.from];
  99         stanza:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 100                 :tag("item", {affiliation=occupant.affiliation or "none", role=occupant.role or "none", nick=nick}):up();
 101         if code then
 102                 stanza:tag("status", {code=code}):up();
 103         end
 104         self:broadcast_except_nick(stanza, stanza.attr.from);
 105         local me = self._occupants[stanza.attr.from];
 106         if me then
 107                 stanza:tag("status", {code='110'});
 108                 stanza.attr.to = sid;
 109                 self:_route_stanza(stanza);
 110         end
 111 end
 112 function room_mt:broadcast_message(stanza, historic)
 113         local to = stanza.attr.to;
 114         for occupant, o_data in pairs(self._occupants) do
 115                 for jid in pairs(o_data.sessions) do
 116                         stanza.attr.to = jid;
 117                         self:_route_stanza(stanza);
 118                 end
 119         end
 120         stanza.attr.to = to;
 121         if historic then -- add to history
 122                 local history = self._data['history'];
 123                 if not history then history = {}; self._data['history'] = history; end
 124                 stanza = st.clone(stanza);
 125                 stanza.attr.to = "";
 126                 local stamp = datetime.datetime();
 127                 local chars = #tostring(stanza);
 128                 stanza:tag("delay", {xmlns = "urn:xmpp:delay", from = muc_domain, stamp = stamp}):up(); -- XEP-0203
 129                 stanza:tag("x", {xmlns = "jabber:x:delay", from = muc_domain, stamp = datetime.legacy()}):up(); -- XEP-0091 (deprecated)
 130                 local entry = { stanza = stanza, stamp = stamp };
 131                 t_insert(history, entry);
 132                 while #history > history_length do t_remove(history, 1) end
 133         end
 134 end
 135 function room_mt:broadcast_except_nick(stanza, nick)
 136         for rnick, occupant in pairs(self._occupants) do
 137                 if rnick ~= nick then
 138                         for jid in pairs(occupant.sessions) do
 139                                 stanza.attr.to = jid;
 140                                 self:_route_stanza(stanza);
 141                         end
 142                 end
 143         end
 144 end
 145
 146 function room_mt:send_occupant_list(to)
 147         local current_nick = self._jid_nick[to];
 148         for occupant, o_data in pairs(self._occupants) do
 149                 if occupant ~= current_nick then
 150                         local pres = get_filtered_presence(o_data.sessions[o_data.jid]);
 151                         pres.attr.to, pres.attr.from = to, occupant;
 152                         pres:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 153                                 :tag("item", {affiliation=o_data.affiliation or "none", role=o_data.role or "none"}):up();
 154                         self:_route_stanza(pres);
 155                 end
 156         end
 157 end
 158 function room_mt:send_history(to, stanza)
 159         local history = self._data['history']; -- send discussion history
 160         if history then
 161                 local x_tag = stanza and stanza:get_child("x", "http://jabber.org/protocol/muc");
 162                 local history_tag = x_tag and x_tag:get_child("history", "http://jabber.org/protocol/muc");
 163
 164                 local maxchars = history_tag and tonumber(history_tag.attr.maxchars);
 165                 if maxchars then maxchars = math.floor(maxchars); end
 166
 167                 local maxstanzas = math.floor(history_tag and tonumber(history_tag.attr.maxstanzas) or #history);
 168                 if not history_tag then maxstanzas = 20; end
 169
 170                 local seconds = history_tag and tonumber(history_tag.attr.seconds);
 171                 if seconds then seconds = datetime.datetime(os.time() - math.floor(seconds)); end
 172
 173                 local since = history_tag and history_tag.attr.since;
 174                 if since and not since:match("^%d%d%d%d%-%d%d%-%d%dT%d%d:%d%d:%d%dZ$") then since = nil; end -- FIXME timezone support
 175                 if seconds and (not since or since < seconds) then since = seconds; end
 176
 177                 local n = 0;
 178                 local charcount = 0;
 179                 local stanzacount = 0;
 180
 181                 for i=#history,1,-1 do
 182                         local entry = history[i];
 183                         if maxchars then
 184                                 if not entry.chars then
 185                                         entry.stanza.attr.to = "";
 186                                         entry.chars = #tostring(entry.stanza);
 187                                 end
 188                                 charcount = charcount + entry.chars + #to;
 189                                 if charcount > maxchars then break; end
 190                         end
 191                         if since and since > entry.stamp then break; end
 192                         if n + 1 > maxstanzas then break; end
 193                         n = n + 1;
 194                 end
 195                 for i=#history-n+1,#history do
 196                         local msg = history[i].stanza;
 197                         msg.attr.to = to;
 198                         self:_route_stanza(msg);
 199                 end
 200         end
 201         if self._data['subject'] then
 202                 self:_route_stanza(st.message({type='groupchat', from=self.jid, to=to}):tag("subject"):text(self._data['subject']));
 203         end
 204 end
 205
 206 function room_mt:get_disco_info(stanza)
 207         return st.reply(stanza):query("http://jabber.org/protocol/disco#info")
 208                 :tag("identity", {category="conference", type="text"}):up()
 209                 :tag("feature", {var="http://jabber.org/protocol/muc"});
 210 end
 211 function room_mt:get_disco_items(stanza)
 212         local reply = st.reply(stanza):query("http://jabber.org/protocol/disco#items");
 213         for room_jid in pairs(self._occupants) do
 214                 reply:tag("item", {jid = room_jid, name = room_jid:match("/(.*)")}):up();
 215         end
 216         return reply;
 217 end
 218 function room_mt:set_subject(current_nick, subject)
 219         -- TODO check nick's authority
 220         if subject == "" then subject = nil; end
 221         self._data['subject'] = subject;
 222         if self.save then self:save(); end
 223         local msg = st.message({type='groupchat', from=current_nick})
 224                 :tag('subject'):text(subject):up();
 225         self:broadcast_message(msg, false);
 226         return true;
 227 end
 228
 229 local function build_unavailable_presence_from_error(stanza)
 230         local type, condition, text = stanza:get_error();
 231         local error_message = "Kicked: "..condition:gsub("%-", " ");
 232         if text then
 233                 error_message = error_message..": "..text;
 234         end
 235         return st.presence({type='unavailable', from=stanza.attr.from, to=stanza.attr.to})
 236                 :tag('status'):text(error_message);
 237 end
 238
 239 function room_mt:set_password(password)
 240         if password == "" or type(password) ~= "string" then password = nil; end
 241         self._data.password = password;
 242         return password;
 243 end
 244 function room_mt:get_password()
 245         return self._data.password;
 246 end
 247
 248 function room_mt:handle_to_occupant(origin, stanza) -- PM, vCards, etc
 249         local from, to = stanza.attr.from, stanza.attr.to;
 250         local room = jid_bare(to);
 251         local current_nick = self._jid_nick[from];
 252         local type = stanza.attr.type;
 253         log("debug", "room: %s, current_nick: %s, stanza: %s", room or "nil", current_nick or "nil", stanza:top_tag());
 254         if (select(2, jid_split(from)) == muc_domain) then error("Presence from the MUC itself!!!"); end
 255         if stanza.name == "presence" then
 256                 local pr = get_filtered_presence(stanza);
 257                 pr.attr.from = current_nick;
 258                 if type == "error" then -- error, kick em out!
 259                         if current_nick then
 260                                 log("debug", "kicking %s from %s", current_nick, room);
 261                                 self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza));
 262                         end
 263                 elseif type == "unavailable" then -- unavailable
 264                         if current_nick then
 265                                 log("debug", "%s leaving %s", current_nick, room);
 266                                 local occupant = self._occupants[current_nick];
 267                                 local new_jid = next(occupant.sessions);
 268                                 if new_jid == from then new_jid = next(occupant.sessions, new_jid); end
 269                                 if new_jid then
 270                                         local jid = occupant.jid;
 271                                         occupant.jid = new_jid;
 272                                         occupant.sessions[from] = nil;
 273                                         pr.attr.to = from;
 274                                         pr:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 275                                                 :tag("item", {affiliation=occupant.affiliation or "none", role='none'}):up()
 276                                                 :tag("status", {code='110'});
 277                                         self:_route_stanza(pr);
 278                                         if jid ~= new_jid then
 279                                                 pr = st.clone(occupant.sessions[new_jid])
 280                                                         :tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 281                                                         :tag("item", {affiliation=occupant.affiliation or "none", role=occupant.role or "none"});
 282                                                 pr.attr.from = current_nick;
 283                                                 self:broadcast_except_nick(pr, current_nick);
 284                                         end
 285                                 else
 286                                         occupant.role = 'none';
 287                                         self:broadcast_presence(pr, from);
 288                                         self._occupants[current_nick] = nil;
 289                                 end
 290                                 self._jid_nick[from] = nil;
 291                         end
 292                 elseif not type then -- available
 293                         if current_nick then
 294                                 --if #pr == #stanza or current_nick ~= to then -- commented because google keeps resending directed presence
 295                                         if current_nick == to then -- simple presence
 296                                                 log("debug", "%s broadcasted presence", current_nick);
 297                                                 self._occupants[current_nick].sessions[from] = pr;
 298                                                 self:broadcast_presence(pr, from);
 299                                         else -- change nick
 300                                                 local occupant = self._occupants[current_nick];
 301                                                 local is_multisession = next(occupant.sessions, next(occupant.sessions));
 302                                                 if self._occupants[to] or is_multisession then
 303                                                         log("debug", "%s couldn't change nick", current_nick);
 304                                                         local reply = st.error_reply(stanza, "cancel", "conflict"):up();
 305                                                         reply.tags[1].attr.code = "409";
 306                                                         origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 307                                                 else
 308                                                         local data = self._occupants[current_nick];
 309                                                         local to_nick = select(3, jid_split(to));
 310                                                         if to_nick then
 311                                                                 log("debug", "%s (%s) changing nick to %s", current_nick, data.jid, to);
 312                                                                 local p = st.presence({type='unavailable', from=current_nick});
 313                                                                 self:broadcast_presence(p, from, '303', to_nick);
 314                                                                 self._occupants[current_nick] = nil;
 315                                                                 self._occupants[to] = data;
 316                                                                 self._jid_nick[from] = to;
 317                                                                 pr.attr.from = to;
 318                                                                 self._occupants[to].sessions[from] = pr;
 319                                                                 self:broadcast_presence(pr, from);
 320                                                         else
 321                                                                 --TODO malformed-jid
 322                                                         end
 323                                                 end
 324                                         end
 325                                 --else -- possible rejoin
 326                                 --      log("debug", "%s had connection replaced", current_nick);
 327                                 --      self:handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to})
 328                                 --              :tag('status'):text('Replaced by new connection'):up()); -- send unavailable
 329                                 --      self:handle_to_occupant(origin, stanza); -- resend available
 330                                 --end
 331                         else -- enter room
 332                                 local new_nick = to;
 333                                 local is_merge;
 334                                 if self._occupants[to] then
 335                                         if jid_bare(from) ~= jid_bare(self._occupants[to].jid) then
 336                                                 new_nick = nil;
 337                                         end
 338                                         is_merge = true;
 339                                 end
 340                                 local password = stanza:get_child("x", "http://jabber.org/protocol/muc");
 341                                 password = password and password:get_child("password", "http://jabber.org/protocol/muc");
 342                                 password = password and password[1] ~= "" and password[1];
 343                                 if self:get_password() and self:get_password() ~= password then
 344                                         log("debug", "%s couldn't join due to invalid password: %s", from, to);
 345                                         local reply = st.error_reply(stanza, "auth", "not-authorized"):up();
 346                                         reply.tags[1].attr.code = "401";
 347                                         origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 348                                 elseif not new_nick then
 349                                         log("debug", "%s couldn't join due to nick conflict: %s", from, to);
 350                                         local reply = st.error_reply(stanza, "cancel", "conflict"):up();
 351                                         reply.tags[1].attr.code = "409";
 352                                         origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 353                                 else
 354                                         log("debug", "%s joining as %s", from, to);
 355                                         if not next(self._affiliations) then -- new room, no owners
 356                                                 self._affiliations[jid_bare(from)] = "owner";
 357                                         end
 358                                         local affiliation = self:get_affiliation(from);
 359                                         local role = self:get_default_role(affiliation)
 360                                         if role then -- new occupant
 361                                                 if not is_merge then
 362                                                         self._occupants[to] = {affiliation=affiliation, role=role, jid=from, sessions={[from]=get_filtered_presence(stanza)}};
 363                                                 else
 364                                                         self._occupants[to].sessions[from] = get_filtered_presence(stanza);
 365                                                 end
 366                                                 self._jid_nick[from] = to;
 367                                                 self:send_occupant_list(from);
 368                                                 pr.attr.from = to;
 369                                                 if not is_merge then
 370                                                         self:broadcast_presence(pr, from);
 371                                                 else
 372                                                         pr.attr.to = from;
 373                                                         self:_route_stanza(pr:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 374                                                                 :tag("item", {affiliation=affiliation or "none", role=role or "none"}):up()
 375                                                                 :tag("status", {code='110'}));
 376                                                 end
 377                                                 self:send_history(from, stanza);
 378                                         else -- banned
 379                                                 local reply = st.error_reply(stanza, "auth", "forbidden"):up();
 380                                                 reply.tags[1].attr.code = "403";
 381                                                 origin.send(reply:tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 382                                         end
 383                                 end
 384                         end
 385                 elseif type ~= 'result' then -- bad type
 386                         if type ~= 'visible' and type ~= 'invisible' then -- COMPAT ejabberd can broadcast or forward XEP-0018 presences
 387                                 origin.send(st.error_reply(stanza, "modify", "bad-request")); -- FIXME correct error?
 388                         end
 389                 end
 390         elseif not current_nick then -- not in room
 391                 if type == "error" or type == "result" then
 392                         local id = stanza.name == "iq" and stanza.attr.id and base64.decode(stanza.attr.id);
 393                         local _nick, _id, _hash = (id or ""):match("^(.+)%z(.*)%z(.+)$");
 394                         local occupant = self._occupants[stanza.attr.to];
 395                         if occupant and _nick and self._jid_nick[_nick] and _id and _hash then
 396                                 local id, _to = stanza.attr.id;
 397                                 for jid in pairs(occupant.sessions) do
 398                                         if md5(jid) == _hash then
 399                                                 _to = jid;
 400                                                 break;
 401                                         end
 402                                 end
 403                                 if _to then
 404                                         stanza.attr.to, stanza.attr.from, stanza.attr.id = _to, self._jid_nick[_nick], _id;
 405                                         self:_route_stanza(stanza);
 406                                         stanza.attr.to, stanza.attr.from, stanza.attr.id = to, from, id;
 407                                 end
 408                         end
 409                 else
 410                         origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 411                 end
 412         elseif stanza.name == "message" and type == "groupchat" then -- groupchat messages not allowed in PM
 413                 origin.send(st.error_reply(stanza, "modify", "bad-request"));
 414         elseif current_nick and stanza.name == "message" and type == "error" and is_kickable_error(stanza) then
 415                 log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
 416                 self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza)); -- send unavailable
 417         else -- private stanza
 418                 local o_data = self._occupants[to];
 419                 if o_data then
 420                         log("debug", "%s sent private stanza to %s (%s)", from, to, o_data.jid);
 421                         local jid = o_data.jid;
 422                         local bare = jid_bare(jid);
 423                         stanza.attr.to, stanza.attr.from = jid, current_nick;
 424                         local id = stanza.attr.id;
 425                         if stanza.name=='iq' and type=='get' and stanza.tags[1].attr.xmlns == 'vcard-temp' and bare ~= jid then
 426                                 stanza.attr.to = bare;
 427                                 stanza.attr.id = base64.encode(jid.."\0"..id.."\0"..md5(from));
 428                         end
 429                         self:_route_stanza(stanza);
 430                         stanza.attr.to, stanza.attr.from, stanza.attr.id = to, from, id;
 431                 elseif type ~= "error" and type ~= "result" then -- recipient not in room
 432                         origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Recipient not in room"));
 433                 end
 434         end
 435 end
 436
 437 function room_mt:send_form(origin, stanza)
 438         local title = "Configuration for "..self.jid;
 439         origin.send(st.reply(stanza):query("http://jabber.org/protocol/muc#owner")
 440                 :tag("x", {xmlns='jabber:x:data', type='form'})
 441                         :tag("title"):text(title):up()
 442                         :tag("instructions"):text(title):up()
 443                         :tag("field", {type='hidden', var='FORM_TYPE'}):tag("value"):text("http://jabber.org/protocol/muc#roomconfig"):up():up()
 444                         :tag("field", {type='boolean', label='Make Room Persistent?', var='muc#roomconfig_persistentroom'})
 445                                 :tag("value"):text(self._data.persistent and "1" or "0"):up()
 446                         :up()
 447                         :tag("field", {type='boolean', label='Make Room Publicly Searchable?', var='muc#roomconfig_publicroom'})
 448                                 :tag("value"):text(self._data.hidden and "0" or "1"):up()
 449                         :up()
 450                         :tag("field", {type='list-single', label='Who May Discover Real JIDs?', var='muc#roomconfig_whois'})
 451                             :tag("value"):text(self._data.whois or 'moderators'):up()
 452                             :tag("option", {label = 'Moderators Only'})
 453                                 :tag("value"):text('moderators'):up()
 454                                 :up()
 455                             :tag("option", {label = 'Anyone'})
 456                                 :tag("value"):text('anyone'):up()
 457                                 :up()
 458                         :up()
 459         );
 460 end
 461
 462 local valid_whois = {
 463     moderators = true,
 464     anyone = true,
 465 }
 466
 467 function room_mt:process_form(origin, stanza)
 468         local query = stanza.tags[1];
 469         local form;
 470         for _, tag in ipairs(query.tags) do if tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then form = tag; break; end end
 471         if not form then origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); return; end
 472         if form.attr.type == "cancel" then origin.send(st.reply(stanza)); return; end
 473         if form.attr.type ~= "submit" then origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
 474         local fields = {};
 475         for _, field in pairs(form.tags) do
 476                 if field.name == "field" and field.attr.var and field.tags[1].name == "value" and #field.tags[1].tags == 0 then
 477                         fields[field.attr.var] = field.tags[1][1] or "";
 478                 end
 479         end
 480         if fields.FORM_TYPE ~= "http://jabber.org/protocol/muc#roomconfig" then origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
 481
 482         local dirty = false
 483
 484         local persistent = fields['muc#roomconfig_persistentroom'];
 485         if persistent == "0" or persistent == "false" then persistent = nil; elseif persistent == "1" or persistent == "true" then persistent = true;
 486         else origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
 487         dirty = dirty or (self._data.persistent ~= persistent)
 488         self._data.persistent = persistent;
 489         module:log("debug", "persistent=%s", tostring(persistent));
 490
 491         local public = fields['muc#roomconfig_publicroom'];
 492         if public == "0" or public == "false" then public = nil; elseif public == "1" or public == "true" then public = true;
 493         else origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
 494         dirty = dirty or (self._data.hidden ~= (not public and true or nil))
 495         self._data.hidden = not public and true or nil;
 496
 497         local whois = fields['muc#roomconfig_whois'];
 498         if not valid_whois[whois] then
 499             origin.send(st.error_reply(stanza, 'cancel', 'bad-request'));
 500             return;
 501         end
 502         local whois_changed = self._data.whois ~= whois
 503         self._data.whois = whois
 504         module:log('debug', 'whois=%s', tostring(whois))
 505
 506         if self.save then self:save(true); end
 507         origin.send(st.reply(stanza));
 508
 509         if dirty or whois_changed then
 510             local msg = st.message({type='groupchat', from=self.jid})
 511                     :tag('x', {xmlns='http://jabber.org/protocol/muc#user'}):up()
 512
 513             if dirty then
 514                 msg.tags[1]:tag('status', {code = '104'})
 515             end
 516             if whois_changed then
 517                 local code = (whois == 'moderators') and 173 or 172
 518                 msg.tags[1]:tag('status', {code = code})
 519             end
 520
 521             self:broadcast_message(msg, false)
 522         end
 523 end
 524
 525 function room_mt:destroy(newjid, reason, password)
 526         local pr = st.presence({type = "unavailable"})
 527                 :tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 528                         :tag("item", { affiliation='none', role='none' }):up()
 529                         :tag("destroy", {jid=newjid})
 530         if reason then pr:tag("reason"):text(reason):up(); end
 531         if password then pr:tag("password"):text(password):up(); end
 532         for nick, occupant in pairs(self._occupants) do
 533                 pr.attr.from = nick;
 534                 for jid in pairs(occupant.sessions) do
 535                         pr.attr.to = jid;
 536                         self:_route_stanza(pr);
 537                         self._jid_nick[jid] = nil;
 538                 end
 539                 self._occupants[nick] = nil;
 540         end
 541         self._data.persistent = nil;
 542         if self.save then self:save(true); end
 543 end
 544
 545 function room_mt:handle_to_room(origin, stanza) -- presence changes and groupchat messages, along with disco/etc
 546         local type = stanza.attr.type;
 547         local xmlns = stanza.tags[1] and stanza.tags[1].attr.xmlns;
 548         if stanza.name == "iq" then
 549                 if xmlns == "http://jabber.org/protocol/disco#info" and type == "get" then
 550                         origin.send(self:get_disco_info(stanza));
 551                 elseif xmlns == "http://jabber.org/protocol/disco#items" and type == "get" then
 552                         origin.send(self:get_disco_items(stanza));
 553                 elseif xmlns == "http://jabber.org/protocol/muc#admin" then
 554                         local actor = stanza.attr.from;
 555                         local affiliation = self:get_affiliation(actor);
 556                         local current_nick = self._jid_nick[actor];
 557                         local role = current_nick and self._occupants[current_nick].role or self:get_default_role(affiliation);
 558                         local item = stanza.tags[1].tags[1];
 559                         if item and item.name == "item" then
 560                                 if type == "set" then
 561                                         local callback = function() origin.send(st.reply(stanza)); end
 562                                         if item.attr.jid then -- Validate provided JID
 563                                                 item.attr.jid = jid_prep(item.attr.jid);
 564                                                 if not item.attr.jid then
 565                                                         origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
 566                                                         return;
 567                                                 end
 568                                         end
 569                                         if not item.attr.jid and item.attr.nick then -- COMPAT Workaround for Miranda sending 'nick' instead of 'jid' when changing affiliation
 570                                                 local occupant = self._occupants[self.jid.."/"..item.attr.nick];
 571                                                 if occupant then item.attr.jid = occupant.jid; end
 572                                         elseif not item.attr.nick and item.attr.jid then
 573                                                 local nick = self._jid_nick[item.attr.jid];
 574                                                 if nick then item.attr.nick = select(3, jid_split(nick)); end
 575                                         end
 576                                         local reason = item.tags[1] and item.tags[1].name == "reason" and #item.tags[1] == 1 and item.tags[1][1];
 577                                         if item.attr.affiliation and item.attr.jid and not item.attr.role then
 578                                                 local success, errtype, err = self:set_affiliation(actor, item.attr.jid, item.attr.affiliation, callback, reason);
 579                                                 if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 580                                         elseif item.attr.role and item.attr.nick and not item.attr.affiliation then
 581                                                 local success, errtype, err = self:set_role(actor, self.jid.."/"..item.attr.nick, item.attr.role, callback, reason);
 582                                                 if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 583                                         else
 584                                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 585                                         end
 586                                 elseif type == "get" then
 587                                         local _aff = item.attr.affiliation;
 588                                         local _rol = item.attr.role;
 589                                         if _aff and not _rol then
 590                                                 if affiliation == "owner" or (affiliation == "admin" and _aff ~= "owner" and _aff ~= "admin") then
 591                                                         local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 592                                                         for jid, affiliation in pairs(self._affiliations) do
 593                                                                 if affiliation == _aff then
 594                                                                         reply:tag("item", {affiliation = _aff, jid = jid}):up();
 595                                                                 end
 596                                                         end
 597                                                         origin.send(reply);
 598                                                 else
 599                                                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 600                                                 end
 601                                         elseif _rol and not _aff then
 602                                                 if role == "moderator" then
 603                                                         -- TODO allow admins and owners not in room? Provide read-only access to everyone who can see the participants anyway?
 604                                                         if _rol == "none" then _rol = nil; end
 605                                                         local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 606                                                         for occupant_jid, occupant in pairs(self._occupants) do
 607                                                                 if occupant.role == _rol then
 608                                                                         reply:tag("item", {
 609                                                                                 nick = select(3, jid_split(occupant_jid)),
 610                                                                                 role = _rol or "none",
 611                                                                                 affiliation = occupant.affiliation or "none",
 612                                                                                 jid = occupant.jid
 613                                                                                 }):up();
 614                                                                 end
 615                                                         end
 616                                                         origin.send(reply);
 617                                                 else
 618                                                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 619                                                 end
 620                                         else
 621                                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 622                                         end
 623                                 end
 624                         elseif type == "set" or type == "get" then
 625                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 626                         end
 627                 elseif xmlns == "http://jabber.org/protocol/muc#owner" and (type == "get" or type == "set") and stanza.tags[1].name == "query" then
 628                         if self:get_affiliation(stanza.attr.from) ~= "owner" then
 629                                 origin.send(st.error_reply(stanza, "auth", "forbidden"));
 630                         elseif stanza.attr.type == "get" then
 631                                 self:send_form(origin, stanza);
 632                         elseif stanza.attr.type == "set" then
 633                                 local child = stanza.tags[1].tags[1];
 634                                 if not child then
 635                                         origin.send(st.error_reply(stanza, "auth", "bad-request"));
 636                                 elseif child.name == "destroy" then
 637                                         local newjid = child.attr.jid;
 638                                         local reason, password;
 639                                         for _,tag in ipairs(child.tags) do
 640                                                 if tag.name == "reason" then
 641                                                         reason = #tag.tags == 0 and tag[1];
 642                                                 elseif tag.name == "password" then
 643                                                         password = #tag.tags == 0 and tag[1];
 644                                                 end
 645                                         end
 646                                         self:destroy(newjid, reason, password);
 647                                         origin.send(st.reply(stanza));
 648                                 else
 649                                         self:process_form(origin, stanza);
 650                                 end
 651                         end
 652                 elseif type == "set" or type == "get" then
 653                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 654                 end
 655         elseif stanza.name == "message" and type == "groupchat" then
 656                 local from, to = stanza.attr.from, stanza.attr.to;
 657                 local room = jid_bare(to);
 658                 local current_nick = self._jid_nick[from];
 659                 local occupant = self._occupants[current_nick];
 660                 if not occupant then -- not in room
 661                         origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 662                 elseif occupant.role == "visitor" then
 663                         origin.send(st.error_reply(stanza, "cancel", "forbidden"));
 664                 else
 665                         local from = stanza.attr.from;
 666                         stanza.attr.from = current_nick;
 667                         local subject = getText(stanza, {"subject"});
 668                         if subject then
 669                                 if occupant.role == "moderator" then
 670                                         self:set_subject(current_nick, subject); -- TODO use broadcast_message_stanza
 671                                 else
 672                                         stanza.attr.from = from;
 673                                         origin.send(st.error_reply(stanza, "cancel", "forbidden"));
 674                                 end
 675                         else
 676                                 self:broadcast_message(stanza, true);
 677                         end
 678                         stanza.attr.from = from;
 679                 end
 680         elseif stanza.name == "message" and type == "error" and is_kickable_error(stanza) then
 681                 local current_nick = self._jid_nick[stanza.attr.from];
 682                 log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
 683                 self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza)); -- send unavailable
 684         elseif stanza.name == "presence" then -- hack - some buggy clients send presence updates to the room rather than their nick
 685                 local to = stanza.attr.to;
 686                 local current_nick = self._jid_nick[stanza.attr.from];
 687                 if current_nick then
 688                         stanza.attr.to = current_nick;
 689                         self:handle_to_occupant(origin, stanza);
 690                         stanza.attr.to = to;
 691                 elseif type ~= "error" and type ~= "result" then
 692                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 693                 end
 694         elseif stanza.name == "message" and not stanza.attr.type and #stanza.tags == 1 and self._jid_nick[stanza.attr.from]
 695                 and stanza.tags[1].name == "x" and stanza.tags[1].attr.xmlns == "http://jabber.org/protocol/muc#user" then
 696                 local x = stanza.tags[1];
 697                 local payload = (#x.tags == 1 and x.tags[1]);
 698                 if payload and payload.name == "invite" and payload.attr.to then
 699                         local _from, _to = stanza.attr.from, stanza.attr.to;
 700                         local _invitee = jid_prep(payload.attr.to);
 701                         if _invitee then
 702                                 local _reason = payload.tags[1] and payload.tags[1].name == 'reason' and #payload.tags[1].tags == 0 and payload.tags[1][1];
 703                                 local invite = st.message({from = _to, to = _invitee, id = stanza.attr.id})
 704                                         :tag('x', {xmlns='http://jabber.org/protocol/muc#user'})
 705                                                 :tag('invite', {from=_from})
 706                                                         :tag('reason'):text(_reason or ""):up()
 707                                                 :up()
 708                                         :up()
 709                                         :tag('x', {xmlns="jabber:x:conference", jid=_to}) -- COMPAT: Some older clients expect this
 710                                                 :text(_reason or "")
 711                                         :up()
 712                                         :tag('body') -- Add a plain message for clients which don't support invites
 713                                                 :text(_from..' invited you to the room '.._to..(_reason and (' ('.._reason..')') or ""))
 714                                         :up();
 715                                 self:_route_stanza(invite);
 716                         else
 717                                 origin.send(st.error_reply(stanza, "cancel", "jid-malformed"));
 718                         end
 719                 else
 720                         origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 721                 end
 722         else
 723                 if type == "error" or type == "result" then return; end
 724                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 725         end
 726 end
 727
 728 function room_mt:handle_stanza(origin, stanza)
 729         local to_node, to_host, to_resource = jid_split(stanza.attr.to);
 730         if to_resource then
 731                 self:handle_to_occupant(origin, stanza);
 732         else
 733                 self:handle_to_room(origin, stanza);
 734         end
 735 end
 736
 737 function room_mt:route_stanza(stanza) end -- Replace with a routing function, e.g., function(room, stanza) core_route_stanza(origin, stanza); end
 738
 739 function room_mt:get_affiliation(jid)
 740         local node, host, resource = jid_split(jid);
 741         local bare = node and node.."@"..host or host;
 742         local result = self._affiliations[bare]; -- Affiliations are granted, revoked, and maintained based on the user's bare JID.
 743         if not result and self._affiliations[host] == "outcast" then result = "outcast"; end -- host banned
 744         return result;
 745 end
 746 function room_mt:set_affiliation(actor, jid, affiliation, callback, reason)
 747         jid = jid_bare(jid);
 748         if affiliation == "none" then affiliation = nil; end
 749         if affiliation and affiliation ~= "outcast" and affiliation ~= "owner" and affiliation ~= "admin" and affiliation ~= "member" then
 750                 return nil, "modify", "not-acceptable";
 751         end
 752         if self:get_affiliation(actor) ~= "owner" then return nil, "cancel", "not-allowed"; end
 753         if jid_bare(actor) == jid then return nil, "cancel", "not-allowed"; end
 754         self._affiliations[jid] = affiliation;
 755         local role = self:get_default_role(affiliation);
 756         local p = st.presence()
 757                 :tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 758                         :tag("item", {affiliation=affiliation or "none", role=role or "none"})
 759                                 :tag("reason"):text(reason or ""):up()
 760                         :up();
 761         local x = p.tags[1];
 762         local item = x.tags[1];
 763         if not role then -- getting kicked
 764                 p.attr.type = "unavailable";
 765                 if affiliation == "outcast" then
 766                         x:tag("status", {code="301"}):up(); -- banned
 767                 else
 768                         x:tag("status", {code="321"}):up(); -- affiliation change
 769                 end
 770         end
 771         local modified_nicks = {};
 772         for nick, occupant in pairs(self._occupants) do
 773                 if jid_bare(occupant.jid) == jid then
 774                         if not role then -- getting kicked
 775                                 self._occupants[nick] = nil;
 776                         else
 777                                 t_insert(modified_nicks, nick);
 778                                 occupant.affiliation, occupant.role = affiliation, role;
 779                         end
 780                         p.attr.from = nick;
 781                         for jid in pairs(occupant.sessions) do -- remove for all sessions of the nick
 782                                 if not role then self._jid_nick[jid] = nil; end
 783                                 p.attr.to = jid;
 784                                 self:_route_stanza(p);
 785                         end
 786                 end
 787         end
 788         if self.save then self:save(); end
 789         if callback then callback(); end
 790         for _, nick in ipairs(modified_nicks) do
 791                 p.attr.from = nick;
 792                 self:broadcast_except_nick(p, nick);
 793         end
 794         return true;
 795 end
 796
 797 function room_mt:get_role(nick)
 798         local session = self._occupants[nick];
 799         return session and session.role or nil;
 800 end
 801 function room_mt:set_role(actor, occupant_jid, role, callback, reason)
 802         if role == "none" then role = nil; end
 803         if role and role ~= "moderator" and role ~= "participant" and role ~= "visitor" then return nil, "modify", "not-acceptable"; end
 804         if self:get_affiliation(actor) ~= "owner" then return nil, "cancel", "not-allowed"; end
 805         local occupant = self._occupants[occupant_jid];
 806         if not occupant then return nil, "modify", "not-acceptable"; end
 807         if occupant.affiliation == "owner" or occupant.affiliation == "admin" then return nil, "cancel", "not-allowed"; end
 808         local p = st.presence({from = occupant_jid})
 809                 :tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 810                         :tag("item", {affiliation=occupant.affiliation or "none", nick=select(3, jid_split(occupant_jid)), role=role or "none"})
 811                                 :tag("reason"):text(reason or ""):up()
 812                         :up();
 813         if not role then -- kick
 814                 p.attr.type = "unavailable";
 815                 self._occupants[occupant_jid] = nil;
 816                 for jid in pairs(occupant.sessions) do -- remove for all sessions of the nick
 817                         self._jid_nick[jid] = nil;
 818                 end
 819                 p:tag("status", {code = "307"}):up();
 820         else
 821                 occupant.role = role;
 822         end
 823         for jid in pairs(occupant.sessions) do -- send to all sessions of the nick
 824                 p.attr.to = jid;
 825                 self:_route_stanza(p);
 826         end
 827         if callback then callback(); end
 828         self:broadcast_except_nick(p, occupant_jid);
 829         return true;
 830 end
 831
 832 function room_mt:_route_stanza(stanza)
 833         local muc_child;
 834         local to_occupant = self._occupants[self._jid_nick[stanza.attr.to]];
 835         local from_occupant = self._occupants[stanza.attr.from];
 836         if stanza.name == "presence" then
 837                 if to_occupant and from_occupant then
 838                         if self._data.whois == 'anyone' then
 839                             muc_child = stanza:get_child("x", "http://jabber.org/protocol/muc#user");
 840                         else
 841                                 if to_occupant.role == "moderator" or jid_bare(to_occupant.jid) == jid_bare(from_occupant.jid) then
 842                                         muc_child = stanza:get_child("x", "http://jabber.org/protocol/muc#user");
 843                                 end
 844                         end
 845                 end
 846         end
 847         if muc_child then
 848                 for _, item in pairs(muc_child.tags) do
 849                         if item.name == "item" then
 850                                 if from_occupant == to_occupant then
 851                                         item.attr.jid = stanza.attr.to;
 852                                 else
 853                                         item.attr.jid = from_occupant.jid;
 854                                 end
 855                         end
 856                 end
 857                 if self._data.whois == 'anyone' then
 858                     muc_child:tag('status', { code = '100' });
 859                 end
 860         end
 861         self:route_stanza(stanza);
 862         if muc_child then
 863                 for _, item in pairs(muc_child.tags) do
 864                         if item.name == "item" then
 865                                 item.attr.jid = nil;
 866                         end
 867                 end
 868         end
 869 end
 870
 871 local _M = {}; -- module "muc"
 872
 873 function _M.new_room(jid)
 874         return setmetatable({
 875                 jid = jid;
 876                 _jid_nick = {};
 877                 _occupants = {};
 878                 _data = {
 879                     whois = 'moderators',
 880                 };
 881                 _affiliations = {};
 882         }, room_mt);
 883 end
 884
 885 return _M;