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