plugins/muc/muc.lib.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9 local datamanager = require "util.datamanager";
  10 local datetime = require "util.datetime";
  11
  12 local jid_split = require "util.jid".split;
  13 local jid_bare = require "util.jid".bare;
  14 local st = require "util.stanza";
  15 local log = require "util.logger".init("mod_muc");
  16 local multitable_new = require "util.multitable".new;
  17 local t_insert, t_remove = table.insert, table.remove;
  18 local setmetatable = setmetatable;
  19 local base64 = require "util.encodings".base64;
  20 local md5 = require "util.hashes".md5;
  21
  22 local muc_domain = nil; --module:get_host();
  23 local history_length = 20;
  24
  25 ------------
  26 local function filter_xmlns_from_array(array, filters)
  27         local count = 0;
  28         for i=#array,1,-1 do
  29                 local attr = array[i].attr;
  30                 if filters[attr and attr.xmlns] then
  31                         t_remove(array, i);
  32                         count = count + 1;
  33                 end
  34         end
  35         return count;
  36 end
  37 local function filter_xmlns_from_stanza(stanza, filters)
  38         if filters then
  39                 if filter_xmlns_from_array(stanza.tags, filters) ~= 0 then
  40                         return stanza, filter_xmlns_from_array(stanza, filters);
  41                 end
  42         end
  43         return stanza, 0;
  44 end
  45 local presence_filters = {["http://jabber.org/protocol/muc"]=true;["http://jabber.org/protocol/muc#user"]=true};
  46 local function get_filtered_presence(stanza)
  47         return filter_xmlns_from_stanza(st.clone(stanza), presence_filters);
  48 end
  49 local kickable_error_conditions = {
  50         ["gone"] = true;
  51         ["internal-server-error"] = true;
  52         ["item-not-found"] = true;
  53         ["jid-malformed"] = true;
  54         ["recipient-unavailable"] = true;
  55         ["redirect"] = true;
  56         ["remote-server-not-found"] = true;
  57         ["remote-server-timeout"] = true;
  58         ["service-unavailable"] = true;
  59 };
  60 local function get_kickable_error(stanza)
  61         for _, tag in ipairs(stanza.tags) do
  62                 if tag.name == "error" and tag.attr.xmlns == "jabber:client" then
  63                         for _, cond in ipairs(tag.tags) do
  64                                 if cond.attr.xmlns == "urn:ietf:params:xml:ns:xmpp-stanzas" then
  65                                         return kickable_error_conditions[cond.name] and cond.name;
  66                                 end
  67                         end
  68                         return true; -- malformed error message
  69                 end
  70         end
  71         return true; -- malformed error message
  72 end
  73 local function getUsingPath(stanza, path, getText)
  74         local tag = stanza;
  75         for _, name in ipairs(path) do
  76                 if type(tag) ~= 'table' then return; end
  77                 tag = tag:child_with_name(name);
  78         end
  79         if tag and getText then tag = table.concat(tag); end
  80         return tag;
  81 end
  82 local function getTag(stanza, path) return getUsingPath(stanza, path); end
  83 local function getText(stanza, path) return getUsingPath(stanza, path, true); end
  84 -----------
  85
  86 --[[function get_room_disco_info(room, stanza)
  87         return st.iq({type='result', id=stanza.attr.id, from=stanza.attr.to, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#info")
  88                 :tag("identity", {category='conference', type='text', name=room._data["name"]):up()
  89                 :tag("feature", {var="http://jabber.org/protocol/muc"}); -- TODO cache disco reply
  90 end
  91 function get_room_disco_items(room, stanza)
  92         return st.iq({type='result', id=stanza.attr.id, from=stanza.attr.to, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#items");
  93 end -- TODO allow non-private rooms]]
  94
  95 --
  96
  97 local room_mt = {};
  98 room_mt.__index = room_mt;
  99
 100 function room_mt:get_default_role(affiliation)
 101         if affiliation == "owner" or affiliation == "admin" then
 102                 return "moderator";
 103         elseif affiliation == "member" or not affiliation then
 104                 return "participant";
 105         end
 106 end
 107
 108 function room_mt:broadcast_presence(stanza, code, nick)
 109         stanza = get_filtered_presence(stanza);
 110         local data = self._occupants[stanza.attr.from];
 111         stanza:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 112                 :tag("item", {affiliation=data.affiliation, role=data.role, nick=nick}):up();
 113         if code then
 114                 stanza:tag("status", {code=code}):up();
 115         end
 116         local me;
 117         for occupant, o_data in pairs(self._occupants) do
 118                 if occupant ~= stanza.attr.from then
 119                         for jid in pairs(o_data.sessions) do
 120                                 stanza.attr.to = jid;
 121                                 self:route_stanza(stanza);
 122                         end
 123                 else
 124                         me = o_data;
 125                 end
 126         end
 127         if me then
 128                 stanza:tag("status", {code='110'});
 129                 for jid in pairs(me.sessions) do
 130                         stanza.attr.to = jid;
 131                         self:route_stanza(stanza);
 132                 end
 133         end
 134 end
 135 function room_mt:broadcast_message(stanza, historic)
 136         for occupant, o_data in pairs(self._occupants) do
 137                 for jid in pairs(o_data.sessions) do
 138                         stanza.attr.to = jid;
 139                         self:route_stanza(stanza);
 140                 end
 141         end
 142         if historic then -- add to history
 143                 local history = self._data['history'];
 144                 if not history then history = {}; self._data['history'] = history; end
 145                 -- stanza = st.clone(stanza);
 146                 stanza:tag("delay", {xmlns = "urn:xmpp:delay", from = muc_domain, stamp = datetime.datetime()}):up(); -- XEP-0203
 147                 stanza:tag("x", {xmlns = "jabber:x:delay", from = muc_domain, stamp = datetime.legacy()}):up(); -- XEP-0091 (deprecated)
 148                 t_insert(history, st.clone(st.preserialize(stanza)));
 149                 while #history > history_length do t_remove(history, 1) end
 150         end
 151 end
 152 function room_mt:broadcast_except_nick(stanza, nick)
 153         for rnick, occupant in pairs(self._occupants) do
 154                 if rnick ~= nick then
 155                         for jid in pairs(occupant.sessions) do
 156                                 stanza.attr.to = jid;
 157                                 self:route_stanza(stanza);
 158                         end
 159                 end
 160         end
 161 end
 162
 163 function room_mt:send_occupant_list(to)
 164         local current_nick = self._jid_nick[to];
 165         for occupant, o_data in pairs(self._occupants) do
 166                 if occupant ~= current_nick then
 167                         local pres = get_filtered_presence(o_data.sessions[o_data.jid]);
 168                         pres.attr.to, pres.attr.from = to, occupant;
 169                         pres:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
 170                                 :tag("item", {affiliation=o_data.affiliation, role=o_data.role}):up();
 171                         self:route_stanza(pres);
 172                 end
 173         end
 174 end
 175 function room_mt:send_history(to)
 176         local history = self._data['history']; -- send discussion history
 177         if history then
 178                 for _, msg in ipairs(history) do
 179                         msg = st.deserialize(msg);
 180                         msg.attr.to=to;
 181                         self:route_stanza(msg);
 182                 end
 183         end
 184         if self._data['subject'] then
 185                 self:route_stanza(st.message({type='groupchat', from=self.jid, to=to}):tag("subject"):text(self._data['subject']));
 186         end
 187 end
 188
 189 local function room_get_disco_info(self, stanza)
 190         return st.reply(stanza):query("http://jabber.org/protocol/disco#info"):tag("identity", {category="conference", type="text"});
 191 end
 192 local function room_get_disco_items(self, stanza)
 193         return st.reply(stanza):query("http://jabber.org/protocol/disco#items");
 194 end
 195 function room_mt:set_subject(current_nick, subject)
 196         -- TODO check nick's authority
 197         if subject == "" then subject = nil; end
 198         self._data['subject'] = subject;
 199         if self.save then self:save(); end
 200         local msg = st.message({type='groupchat', from=current_nick})
 201                 :tag('subject'):text(subject):up();
 202         self:broadcast_message(msg, false);
 203         return true;
 204 end
 205
 206 function room_mt:handle_to_occupant(origin, stanza) -- PM, vCards, etc
 207         local from, to = stanza.attr.from, stanza.attr.to;
 208         local room = jid_bare(to);
 209         local current_nick = self._jid_nick[from];
 210         local type = stanza.attr.type;
 211         log("debug", "room: %s, current_nick: %s, stanza: %s", room or "nil", current_nick or "nil", stanza:top_tag());
 212         if (select(2, jid_split(from)) == muc_domain) then error("Presence from the MUC itself!!!"); end
 213         if stanza.name == "presence" then
 214                 local pr = get_filtered_presence(stanza);
 215                 pr.attr.from = current_nick;
 216                 if type == "error" then -- error, kick em out!
 217                         if current_nick then
 218                                 log("debug", "kicking %s from %s", current_nick, room);
 219                                 self:handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to})
 220                                         :tag('status'):text('This participant is kicked from the room because he sent an error presence')); -- send unavailable
 221                         end
 222                 elseif type == "unavailable" then -- unavailable
 223                         if current_nick then
 224                                 log("debug", "%s leaving %s", current_nick, room);
 225                                 local data = self._occupants[current_nick];
 226                                 data.role = 'none';
 227                                 self:broadcast_presence(pr);
 228                                 self._occupants[current_nick] = nil;
 229                                 self._jid_nick[from] = nil;
 230                         end
 231                 elseif not type then -- available
 232                         if current_nick then
 233                                 --if #pr == #stanza or current_nick ~= to then -- commented because google keeps resending directed presence
 234                                         if current_nick == to then -- simple presence
 235                                                 log("debug", "%s broadcasted presence", current_nick);
 236                                                 self._occupants[current_nick].sessions[from] = pr;
 237                                                 self:broadcast_presence(pr);
 238                                         else -- change nick
 239                                                 if self._occupants[to] then
 240                                                         log("debug", "%s couldn't change nick", current_nick);
 241                                                         origin.send(st.error_reply(stanza, "cancel", "conflict"):tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 242                                                 else
 243                                                         local data = self._occupants[current_nick];
 244                                                         local to_nick = select(3, jid_split(to));
 245                                                         if to_nick then
 246                                                                 log("debug", "%s (%s) changing nick to %s", current_nick, data.jid, to);
 247                                                                 local p = st.presence({type='unavailable', from=current_nick});
 248                                                                 self:broadcast_presence(p, '303', to_nick);
 249                                                                 self._occupants[current_nick] = nil;
 250                                                                 self._occupants[to] = data;
 251                                                                 self._jid_nick[from] = to;
 252                                                                 pr.attr.from = to;
 253                                                                 self._occupants[to].sessions[from] = pr;
 254                                                                 self:broadcast_presence(pr);
 255                                                         else
 256                                                                 --TODO malformed-jid
 257                                                         end
 258                                                 end
 259                                         end
 260                                 --else -- possible rejoin
 261                                 --      log("debug", "%s had connection replaced", current_nick);
 262                                 --      self:handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to})
 263                                 --              :tag('status'):text('Replaced by new connection'):up()); -- send unavailable
 264                                 --      self:handle_to_occupant(origin, stanza); -- resend available
 265                                 --end
 266                         else -- enter room
 267                                 local new_nick = to;
 268                                 if self._occupants[to] then
 269                                         new_nick = nil;
 270                                 end
 271                                 if not new_nick then
 272                                         log("debug", "%s couldn't join due to nick conflict: %s", from, to);
 273                                         origin.send(st.error_reply(stanza, "cancel", "conflict"):tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 274                                 else
 275                                         log("debug", "%s joining as %s", from, to);
 276                                         if not next(self._affiliations) then -- new room, no owners
 277                                                 self._affiliations[jid_bare(from)] = "owner";
 278                                         end
 279                                         local affiliation = self:get_affiliation(from);
 280                                         local role = self:get_default_role(affiliation)
 281                                         if role then -- new occupant
 282                                                 self._occupants[to] = {affiliation=affiliation, role=role, jid=from, sessions={[from]=get_filtered_presence(stanza)}};
 283                                                 self._jid_nick[from] = to;
 284                                                 self:send_occupant_list(from);
 285                                                 pr.attr.from = to;
 286                                                 self:broadcast_presence(pr);
 287                                                 self:send_history(from);
 288                                         else -- banned
 289                                                 origin.send(st.error_reply(stanza, "auth", "forbidden"):tag("x", {xmlns = "http://jabber.org/protocol/muc"}));
 290                                         end
 291                                 end
 292                         end
 293                 elseif type ~= 'result' then -- bad type
 294                         origin.send(st.error_reply(stanza, "modify", "bad-request")); -- FIXME correct error?
 295                 end
 296         elseif not current_nick then -- not in room
 297                 if type == "error" or type == "result" then
 298                         local id = stanza.name == "iq" and stanza.attr.id and base64.decode(stanza.attr.id);
 299                         local _nick, _id, _hash = (id or ""):match("^(.+)%z(.*)%z(.+)$");
 300                         local occupant = self._occupants[stanza.attr.to];
 301                         if occupant and _nick and self._jid_nick[_nick] and _id and _hash then
 302                                 local id, _to = stanza.attr.id;
 303                                 for jid in pairs(occupant.sessions) do
 304                                         if md5(jid) == _hash then
 305                                                 _to = jid;
 306                                                 break;
 307                                         end
 308                                 end
 309                                 if _to then
 310                                         stanza.attr.to, stanza.attr.from, stanza.attr.id = _to, self._jid_nick[_nick], _id;
 311                                         self:route_stanza(stanza);
 312                                         stanza.attr.to, stanza.attr.from, stanza.attr.id = to, from, id;
 313                                 end
 314                         end
 315                 else
 316                         origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 317                 end
 318         elseif stanza.name == "message" and type == "groupchat" then -- groupchat messages not allowed in PM
 319                 origin.send(st.error_reply(stanza, "modify", "bad-request"));
 320         else -- private stanza
 321                 local o_data = self._occupants[to];
 322                 if o_data then
 323                         log("debug", "%s sent private stanza to %s (%s)", from, to, o_data.jid);
 324                         local jid = o_data.jid;
 325                         local bare = jid_bare(jid);
 326                         stanza.attr.to, stanza.attr.from = jid, current_nick;
 327                         local id = stanza.attr.id;
 328                         if stanza.name=='iq' and type=='get' and stanza.tags[1].attr.xmlns == 'vcard-temp' and bare ~= jid then
 329                                 stanza.attr.to = bare;
 330                                 stanza.attr.id = base64.encode(jid.."\0"..id.."\0"..md5(from));
 331                         end
 332                         self:route_stanza(stanza);
 333                         stanza.attr.to, stanza.attr.from, stanza.attr.id = to, from, id;
 334                 elseif type ~= "error" and type ~= "result" then -- recipient not in room
 335                         origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Recipient not in room"));
 336                 end
 337         end
 338 end
 339
 340 function room_mt:handle_form(origin, stanza)
 341         if self:get_affiliation(stanza.attr.from) ~= "owner" then origin.send(st.error_reply(stanza, "auth", "forbidden")); return; end
 342         if stanza.attr.type == "get" then
 343                 local title = "Configuration for "..self.jid;
 344                 origin.send(st.reply(stanza):query("http://jabber.org/protocol/muc#owner")
 345                         :tag("x", {xmlns='jabber:x:data', type='form'})
 346                                 :tag("title"):text(title):up()
 347                                 :tag("instructions"):text(title):up()
 348                                 :tag("field", {type='hidden', var='FORM_TYPE'}):tag("value"):text("http://jabber.org/protocol/muc#roomconfig"):up():up()
 349                                 :tag("field", {type='boolean', label='Make Room Persistent?', var='muc#roomconfig_persistentroom'})
 350                                         :tag("value"):text(self._data.persistent and "1" or "0"):up()
 351                                 :up()
 352                                 :tag("field", {type='boolean', label='Make Room Publicly Searchable?', var='muc#roomconfig_publicroom'})
 353                                         :tag("value"):text(self._data.hidden and "0" or "1"):up()
 354                                 :up()
 355                 );
 356         elseif stanza.attr.type == "set" then
 357                 local query = stanza.tags[1];
 358                 local form;
 359                 for _, tag in ipairs(query.tags) do if tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then form = tag; break; end end
 360                 if not form then origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); return; end
 361                 if form.attr.type == "cancel" then origin.send(st.reply(stanza)); return; end
 362                 if form.attr.type ~= "submit" then origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
 363                 local fields = {};
 364                 for _, field in pairs(form.tags) do
 365                         if field.name == "field" and field.attr.var and field.tags[1].name == "value" and #field.tags[1].tags == 0 then
 366                                 fields[field.attr.var] = field.tags[1][1] or "";
 367                         end
 368                 end
 369                 if fields.FORM_TYPE ~= "http://jabber.org/protocol/muc#roomconfig" then origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
 370
 371                 local persistent = fields['muc#roomconfig_persistentroom'];
 372                 if persistent == "0" or persistent == "false" then persistent = nil; elseif persistent == "1" or persistent == "true" then persistent = true;
 373                 else origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
 374                 self._data.persistent = persistent;
 375                 module:log("debug", "persistent=%s", tostring(persistent));
 376
 377                 local public = fields['muc#roomconfig_publicroom'];
 378                 if public == "0" or public == "false" then public = nil; elseif public == "1" or public == "true" then public = true;
 379                 else origin.send(st.error_reply(stanza, "cancel", "bad-request")); return; end
 380                 self._data.hidden = not public and true or nil;
 381
 382                 if self.save then self:save(true); end
 383                 origin.send(st.reply(stanza));
 384         end
 385 end
 386
 387 function room_mt:handle_to_room(origin, stanza) -- presence changes and groupchat messages, along with disco/etc
 388         local type = stanza.attr.type;
 389         local xmlns = stanza.tags[1] and stanza.tags[1].attr.xmlns;
 390         if stanza.name == "iq" then
 391                 if xmlns == "http://jabber.org/protocol/disco#info" and type == "get" then
 392                         origin.send(room_get_disco_info(self, stanza));
 393                 elseif xmlns == "http://jabber.org/protocol/disco#items" and type == "get" then
 394                         origin.send(room_get_disco_items(self, stanza));
 395                 elseif xmlns == "http://jabber.org/protocol/muc#admin" then
 396                         local actor = stanza.attr.from;
 397                         local affiliation = self:get_affiliation(actor);
 398                         local current_nick = self._jid_nick[actor];
 399                         local role = current_nick and self._occupants[current_nick].role or self:get_default_role(affiliation);
 400                         local item = stanza.tags[1].tags[1];
 401                         if item and item.name == "item" then
 402                                 if type == "set" then
 403                                         local callback = function() origin.send(st.reply(stanza)); end
 404                                         if not item.attr.jid and item.attr.nick then -- COMPAT Workaround for Miranda sending 'nick' instead of 'jid' when changing affiliation
 405                                                 local occupant = self._occupants[self.jid.."/"..item.attr.nick];
 406                                                 if occupant then item.attr.jid = occupant.jid; end
 407                                         end
 408                                         if item.attr.affiliation and item.attr.jid and not item.attr.role then
 409                                                 local success, errtype, err = self:set_affiliation(actor, item.attr.jid, item.attr.affiliation, callback);
 410                                                 if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 411                                         elseif item.attr.role and item.attr.nick and not item.attr.affiliation then
 412                                                 local success, errtype, err = self:set_role(actor, self.jid.."/"..item.attr.nick, item.attr.role, callback);
 413                                                 if not success then origin.send(st.error_reply(stanza, errtype, err)); end
 414                                         else
 415                                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 416                                         end
 417                                 elseif type == "get" then
 418                                         local _aff = item.attr.affiliation;
 419                                         local _rol = item.attr.role;
 420                                         if _aff and not _rol then
 421                                                 if affiliation == "owner" or (affiliation == "admin" and _aff ~= "owner" and _aff ~= "admin") then
 422                                                         local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 423                                                         for jid, affiliation in pairs(self._affiliations) do
 424                                                                 if affiliation == _aff then
 425                                                                         reply:tag("item", {affiliation = _aff, jid = jid}):up();
 426                                                                 end
 427                                                         end
 428                                                         origin.send(reply);
 429                                                 else
 430                                                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 431                                                 end
 432                                         elseif _rol and not _aff then
 433                                                 if role == "moderator" then
 434                                                         -- TODO allow admins and owners not in room? Provide read-only access to everyone who can see the participants anyway?
 435                                                         if _rol == "none" then _rol = nil; end
 436                                                         local reply = st.reply(stanza):query("http://jabber.org/protocol/muc#admin");
 437                                                         for nick, occupant in pairs(self._occupants) do
 438                                                                 if occupant.role == _rol then
 439                                                                         reply:tag("item", {nick = nick, role = _rol or "none", affiliation = occupant.affiliation or "none", jid = occupant.jid}):up();
 440                                                                 end
 441                                                         end
 442                                                         origin.send(reply);
 443                                                 else
 444                                                         origin.send(st.error_reply(stanza, "auth", "forbidden"));
 445                                                 end
 446                                         else
 447                                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 448                                         end
 449                                 end
 450                         elseif type == "set" or type == "get" then
 451                                 origin.send(st.error_reply(stanza, "cancel", "bad-request"));
 452                         end
 453                 elseif xmlns == "http://jabber.org/protocol/muc#owner" and (type == "get" or type == "set") and stanza.tags[1].name == "query" then
 454                         self:handle_form(origin, stanza);
 455                 elseif type == "set" or type == "get" then
 456                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 457                 end
 458         elseif stanza.name == "message" and type == "groupchat" then
 459                 local from, to = stanza.attr.from, stanza.attr.to;
 460                 local room = jid_bare(to);
 461                 local current_nick = self._jid_nick[from];
 462                 if not current_nick then -- not in room
 463                         origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
 464                 else
 465                         local from = stanza.attr.from;
 466                         stanza.attr.from = current_nick;
 467                         local subject = getText(stanza, {"subject"});
 468                         if subject then
 469                                 self:set_subject(current_nick, subject); -- TODO use broadcast_message_stanza
 470                         else
 471                                 self:broadcast_message(stanza, true);
 472                         end
 473                 end
 474         elseif stanza.name == "message" and type == "error" and get_kickable_error(stanza) then
 475                 local current_nick = self._jid_nick[stanza.attr.from];
 476                 log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
 477                 self:handle_to_occupant(origin, st.presence({type='unavailable', from=stanza.attr.from, to=stanza.attr.to})
 478                         :tag('status'):text('This participant is kicked from the room because he sent an error message to another occupant')); -- send unavailable
 479         elseif stanza.name == "presence" then -- hack - some buggy clients send presence updates to the room rather than their nick
 480                 local to = stanza.attr.to;
 481                 local current_nick = self._jid_nick[stanza.attr.from];
 482                 if current_nick then
 483                         stanza.attr.to = current_nick;
 484                         self:handle_to_occupant(origin, stanza);
 485                         stanza.attr.to = to;
 486                 elseif type ~= "error" and type ~= "result" then
 487                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 488                 end
 489         elseif stanza.name == "message" and not stanza.attr.type and #stanza.tags == 1 and self._jid_nick[stanza.attr.from]
 490                 and stanza.tags[1].name == "x" and stanza.tags[1].attr.xmlns == "http://jabber.org/protocol/muc#user" and #stanza.tags[1].tags == 1
 491                 and stanza.tags[1].tags[1].name == "invite" and stanza.tags[1].tags[1].attr.to then
 492                 local _from, _to = stanza.attr.from, stanza.attr.to;
 493                 local _invitee = stanza.tags[1].tags[1].attr.to;
 494                 stanza.attr.from, stanza.attr.to = _to, _invitee;
 495                 stanza.tags[1].tags[1].attr.from, stanza.tags[1].tags[1].attr.to = _from, nil;
 496                 self:route_stanza(stanza);
 497                 stanza.tags[1].tags[1].attr.from, stanza.tags[1].tags[1].attr.to = nil, _invitee;
 498                 stanza.attr.from, stanza.attr.to = _from, _to;
 499         else
 500                 if type == "error" or type == "result" then return; end
 501                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 502         end
 503 end
 504
 505 function room_mt:handle_stanza(origin, stanza)
 506         local to_node, to_host, to_resource = jid_split(stanza.attr.to);
 507         if to_resource then
 508                 self:handle_to_occupant(origin, stanza);
 509         else
 510                 self:handle_to_room(origin, stanza);
 511         end
 512 end
 513
 514 function room_mt:route_stanza(stanza) end -- Replace with a routing function, e.g., function(room, stanza) core_route_stanza(origin, stanza); end
 515
 516 function room_mt:get_affiliation(jid)
 517         local node, host, resource = jid_split(jid);
 518         local bare = node and node.."@"..host or host;
 519         local result = self._affiliations[bare]; -- Affiliations are granted, revoked, and maintained based on the user's bare JID.
 520         if not result and self._affiliations[host] == "outcast" then result = "outcast"; end -- host banned
 521         return result;
 522 end
 523 function room_mt:set_affiliation(actor, jid, affiliation, callback)
 524         jid = jid_bare(jid);
 525         if affiliation == "none" then affiliation = nil; end
 526         if affiliation and affiliation ~= "outcast" and affiliation ~= "owner" and affiliation ~= "admin" and affiliation ~= "member" then
 527                 return nil, "modify", "not-acceptable";
 528         end
 529         if self:get_affiliation(actor) ~= "owner" then return nil, "cancel", "not-allowed"; end
 530         if jid_bare(actor) == jid then return nil, "cancel", "not-allowed"; end
 531         self._affiliations[jid] = affiliation;
 532         local role = self:get_default_role(affiliation);
 533         local p = st.presence()
 534                 :tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 535                         :tag("item", {affiliation=affiliation or "none", role=role or "none"}):up();
 536         local x = p.tags[1];
 537         local item = x.tags[1];
 538         if not role then -- getting kicked
 539                 p.attr.type = "unavailable";
 540                 if affiliation == "outcast" then
 541                         x:tag("status", {code="301"}):up(); -- banned
 542                 else
 543                         x:tag("status", {code="321"}):up(); -- affiliation change
 544                 end
 545         end
 546         local modified_nicks = {};
 547         for nick, occupant in pairs(self._occupants) do
 548                 if jid_bare(occupant.jid) == jid then
 549                         if not role then -- getting kicked
 550                                 self._occupants[nick] = nil;
 551                         else
 552                                 t_insert(modified_nicks, nick);
 553                                 occupant.affiliation, occupant.role = affiliation, role;
 554                         end
 555                         p.attr.from = nick;
 556                         for jid in pairs(occupant.sessions) do -- remove for all sessions of the nick
 557                                 if not role then self._jid_nick[jid] = nil; end
 558                                 p.attr.to = jid;
 559                                 self:route_stanza(p);
 560                         end
 561                 end
 562         end
 563         if self.save then self:save(); end
 564         if callback then callback(); end
 565         for _, nick in ipairs(modified_nicks) do
 566                 p.attr.from = nick;
 567                 self:broadcast_except_nick(p, nick);
 568         end
 569         return true;
 570 end
 571
 572 function room_mt:get_role(nick)
 573         local session = self._occupants[nick];
 574         return session and session.role or nil;
 575 end
 576 function room_mt:set_role(actor, nick, role, callback)
 577         if role == "none" then role = nil; end
 578         if role and role ~= "moderator" and role ~= "participant" and role ~= "visitor" then return nil, "modify", "not-acceptable"; end
 579         if self:get_affiliation(actor) ~= "owner" then return nil, "cancel", "not-allowed"; end
 580         local occupant = self._occupants[nick];
 581         if not occupant then return nil, "modify", "not-acceptable"; end
 582         if occupant.affiliation == "owner" or occupant.affiliation == "admin" then return nil, "cancel", "not-allowed"; end
 583         local p = st.presence({from = nick})
 584                 :tag("x", {xmlns = "http://jabber.org/protocol/muc#user"})
 585                         :tag("item", {affiliation=occupant.affiliation or "none", nick=nick, role=role or "none"}):up();
 586         if not role then -- kick
 587                 p.attr.type = "unavailable";
 588                 self._occupants[nick] = nil;
 589                 for jid in pairs(occupant.sessions) do -- remove for all sessions of the nick
 590                         self._jid_nick[jid] = nil;
 591                 end
 592                 p:tag("status", {code = "307"}):up();
 593         else
 594                 occupant.role = role;
 595         end
 596         for jid in pairs(occupant.sessions) do -- send to all sessions of the nick
 597                 p.attr.to = jid;
 598                 self:route_stanza(p);
 599         end
 600         if callback then callback(); end
 601         self:broadcast_except_nick(p, nick);
 602         return true;
 603 end
 604
 605 local _M = {}; -- module "muc"
 606
 607 function _M.new_room(jid)
 608         return setmetatable({
 609                 jid = jid;
 610                 _jid_nick = {};
 611                 _occupants = {};
 612                 _data = {};
 613                 _affiliations = {};
 614         }, room_mt);
 615 end
 616
 617 return _M;