prosody
06051191913d
util/muc.lua

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util/muc.lua @ 1145:06051191913d

util.muc: A MUC library - initial commit
author Waqas Hussain <waqas20@gmail.com>
date Wed, 13 May 2009 23:24:49 +0500
child 1170:4845372a2c03
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1144:fbd65e966316 1145:06051191913d
1 -- Prosody IM v0.4
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
19 local muc_domain = nil; --module:get_host();
20 local history_length = 20;
21
22 ------------
23 local function filter_xmlns_from_array(array, filters)
24 local count = 0;
25 for i=#array,1,-1 do
26 local attr = array[i].attr;
27 if filters[attr and attr.xmlns] then
28 t_remove(array, i);
29 count = count + 1;
30 end
31 end
32 return count;
33 end
34 local function filter_xmlns_from_stanza(stanza, filters)
35 if filters then
36 if filter_xmlns_from_array(stanza.tags, filters) ~= 0 then
37 return stanza, filter_xmlns_from_array(stanza, filters);
38 end
39 end
40 return stanza, 0;
41 end
42 local presence_filters = {["http://jabber.org/protocol/muc"]=true;["http://jabber.org/protocol/muc#user"]=true};
43 local function get_filtered_presence(stanza)
44 return filter_xmlns_from_stanza(st.clone(stanza), presence_filters);
45 end
46 local kickable_error_conditions = {
47 ["gone"] = true;
48 ["internal-server-error"] = true;
49 ["item-not-found"] = true;
50 ["jid-malformed"] = true;
51 ["recipient-unavailable"] = true;
52 ["redirect"] = true;
53 ["remote-server-not-found"] = true;
54 ["remote-server-timeout"] = true;
55 ["service-unavailable"] = true;
56 };
57 local function get_kickable_error(stanza)
58 for _, tag in ipairs(stanza.tags) do
59 if tag.name == "error" and tag.attr.xmlns == "jabber:client" then
60 for _, cond in ipairs(tag.tags) do
61 if cond.attr.xmlns == "urn:ietf:params:xml:ns:xmpp-stanzas" then
62 return kickable_error_conditions[cond.name] and cond.name;
63 end
64 end
65 return true; -- malformed error message
66 end
67 end
68 return true; -- malformed error message
69 end
70 local function getUsingPath(stanza, path, getText)
71 local tag = stanza;
72 for _, name in ipairs(path) do
73 if type(tag) ~= 'table' then return; end
74 tag = tag:child_with_name(name);
75 end
76 if tag and getText then tag = table.concat(tag); end
77 return tag;
78 end
79 local function getTag(stanza, path) return getUsingPath(stanza, path); end
80 local function getText(stanza, path) return getUsingPath(stanza, path, true); end
81 -----------
82
83 --[[function get_room_disco_info(room, stanza)
84 return st.iq({type='result', id=stanza.attr.id, from=stanza.attr.to, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#info")
85 :tag("identity", {category='conference', type='text', name=room._data["name"]):up()
86 :tag("feature", {var="http://jabber.org/protocol/muc"}); -- TODO cache disco reply
87 end
88 function get_room_disco_items(room, stanza)
89 return st.iq({type='result', id=stanza.attr.id, from=stanza.attr.to, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#items");
90 end -- TODO allow non-private rooms]]
91
92 --
93
94 local function room_broadcast_presence(room, stanza, code, nick)
95 stanza = get_filtered_presence(stanza);
96 local data = room._participants[stanza.attr.from];
97 stanza:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
98 :tag("item", {affiliation=data.affiliation, role=data.role, nick=nick}):up();
99 if code then
100 stanza:tag("status", {code=code}):up();
101 end
102 local me;
103 for occupant, o_data in pairs(room._participants) do
104 if occupant ~= stanza.attr.from then
105 for jid in pairs(o_data.sessions) do
106 stanza.attr.to = jid;
107 room:route_stanza(stanza);
108 end
109 else
110 me = o_data;
111 end
112 end
113 if me then
114 stanza:tag("status", {code='110'});
115 for jid in pairs(me.sessions) do
116 stanza.attr.to = jid;
117 room:route_stanza(stanza);
118 end
119 end
120 end
121 function room_broadcast_message(room, stanza, historic)
122 for occupant, o_data in pairs(room._participants) do
123 for jid in pairs(o_data.sessions) do
124 stanza.attr.to = jid;
125 room:route_stanza(stanza);
126 end
127 end
128 if historic then -- add to history
129 local history = room._data['history'];
130 if not history then history = {}; room._data['history'] = history; end
131 -- stanza = st.clone(stanza);
132 stanza:tag("delay", {xmlns = "urn:xmpp:delay", from = muc_domain, stamp = datetime.datetime()}):up(); -- XEP-0203
133 stanza:tag("x", {xmlns = "jabber:x:delay", from = muc_domain, stamp = datetime.legacy()}):up(); -- XEP-0091 (deprecated)
134 t_insert(history, st.clone(st.preserialize(stanza)));
135 while #history > history_length do t_remove(history, 1) end
136 end
137 end
138
139
140 local function room_send_occupant_list(room, to)
141 local current_nick = room._jid_nick[to];
142 for occupant, o_data in pairs(room._participants) do
143 if occupant ~= current_nick then
144 local pres = get_filtered_presence(o_data.sessions[o_data.jid]);
145 pres.attr.to, pres.attr.from = to, occupant;
146 pres:tag("x", {xmlns='http://jabber.org/protocol/muc#user'})
147 :tag("item", {affiliation=o_data.affiliation, role=o_data.role}):up();
148 room:route_stanza(pres);
149 end
150 end
151 end
152 function send_history(room, to)
153 local history = room._data['history']; -- send discussion history
154 if history then
155 for _, msg in ipairs(history) do
156 msg = st.deserialize(msg);
157 msg.attr.to=to;
158 room:route_stanza(msg);
159 end
160 end
161 if room._data['subject'] then
162 room:route_stanza(st.message({type='groupchat', from=room, to=to}):tag("subject"):text(room._data['subject']));
163 end
164 end
165
166 local function room_get_disco_info(self, stanza) end
167 local function room_get_disco_items(self, stanza) end
168 local function room_set_subject(room, current_nick, room, subject)
169 -- TODO check nick's authority
170 if subject == "" then subject = nil; end
171 room._data['subject'] = subject;
172 local msg = st.message({type='groupchat', from=current_nick})
173 :tag('subject'):text(subject):up();
174 room_broadcast_message(room, msg, false);
175 return true;
176 end
177
178 local function room_handle_to_occupant(self, origin, stanza) -- PM, vCards, etc
179 local from, to = stanza.attr.from, stanza.attr.to;
180 local room = jid_bare(to);
181 local current_nick = self._jid_nick[from];
182 local type = stanza.attr.type;
183 log("debug", "room: %s, current_nick: %s, stanza: %s", room or "nil", current_nick or "nil", stanza:top_tag());
184 if (select(2, jid_split(from)) == muc_domain) then error("Presence from the MUC itself!!!"); end
185 if stanza.name == "presence" then
186 local pr = get_filtered_presence(stanza);
187 pr.attr.from = current_nick;
188 if type == "error" then -- error, kick em out!
189 if current_nick then
190 log("debug", "kicking %s from %s", current_nick, room);
191 room_handle_to_occupant(self, origin, st.presence({type='unavailable', from=from, to=to}):tag('status'):text('This participant is kicked from the room because he sent an error presence')); -- send unavailable
192 end
193 elseif type == "unavailable" then -- unavailable
194 if current_nick then
195 log("debug", "%s leaving %s", current_nick, room);
196 local data = self._participants[current_nick];
197 data.role = 'none';
198 room_broadcast_presence(room, pr);
199 self._participants[current_nick] = nil;
200 self._jid_nick[from] = nil;
201 end
202 elseif not type then -- available
203 if current_nick then
204 --if #pr == #stanza or current_nick ~= to then -- commented because google keeps resending directed presence
205 if current_nick == to then -- simple presence
206 log("debug", "%s broadcasted presence", current_nick);
207 self._participants[current_nick].sessions[from] = pr;
208 room_broadcast_presence(self, pr);
209 else -- change nick
210 if self._participants[to] then
211 log("debug", "%s couldn't change nick", current_nick);
212 origin.send(st.error_reply(stanza, "cancel", "conflict"));
213 else
214 local data = self._participants[current_nick];
215 local to_nick = select(3, jid_split(to));
216 if to_nick then
217 log("debug", "%s (%s) changing nick to %s", current_nick, data.jid, to);
218 local p = st.presence({type='unavailable', from=current_nick});
219 room_broadcast_presence(self, p, '303', to_nick);
220 self._participants[current_nick] = nil;
221 self._participants[to] = data;
222 self._jid_nick[from] = to;
223 pr.attr.from = to;
224 self._participants[to].sessions[from] = pr;
225 room_broadcast_presence(self, pr);
226 else
227 --TODO malformed-jid
228 end
229 end
230 end
231 --else -- possible rejoin
232 -- log("debug", "%s had connection replaced", current_nick);
233 -- handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to}):tag('status'):text('Replaced by new connection'):up()); -- send unavailable
234 -- handle_to_occupant(origin, stanza); -- resend available
235 --end
236 else -- enter room
237 local new_nick = to;
238 if self._participants[to] then
239 new_nick = nil;
240 end
241 if not new_nick then
242 log("debug", "%s couldn't join due to nick conflict: %s", from, to);
243 origin.send(st.error_reply(stanza, "cancel", "conflict"));
244 else
245 log("debug", "%s joining as %s", from, to);
246 local data;
247 -- if not rooms:get(room) and not rooms_info:get(room) then -- new room
248 -- rooms_info:set(room, 'name', (jid_split(room)));
249 -- data = {affiliation='owner', role='moderator', jid=from, sessions={[from]=get_filtered_presence(stanza)}};
250 -- end
251 if not data then -- new occupant
252 data = {affiliation='none', role='participant', jid=from, sessions={[from]=get_filtered_presence(stanza)}};
253 end
254 self._participants[to] = data;
255 self._jid_nick[from] = to;
256 room_send_occupant_list(self, from);
257 pr.attr.from = to;
258 room_broadcast_presence(self, pr);
259 room_send_history(self, from);
260 end
261 end
262 elseif type ~= 'result' then -- bad type
263 origin.send(st.error_reply(stanza, "modify", "bad-request")); -- FIXME correct error?
264 end
265 elseif not current_nick and type ~= "error" then -- not in room
266 origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
267 elseif stanza.name == "message" and type == "groupchat" then -- groupchat messages not allowed in PM
268 origin.send(st.error_reply(stanza, "modify", "bad-request"));
269 elseif stanza.name == "message" and type == "error" and get_kickable_error(stanza) then
270 log("debug", "%s kicked from %s for sending an error message", current_nick, room);
271 room_handle_to_occupant(self, origin, st.presence({type='unavailable', from=from, to=to}):tag('status'):text('This participant is kicked from the room because he sent an error message to another occupant')); -- send unavailable
272 else -- private stanza
273 local o_data = self._participants[to];
274 if o_data then
275 log("debug", "%s sent private stanza to %s (%s)", from, to, o_data.jid);
276 local jid = o_data.jid;
277 if stanza.name=='iq' and type=='get' and stanza.tags[1].attr.xmlns == 'vcard-temp' then jid = jid_bare(jid); end
278 stanza.attr.to, stanza.attr.from = jid, current_nick;
279 self:route_stanza(stanza);
280 elseif type ~= "error" and type ~= "result" then -- recipient not in room
281 origin.send(st.error_reply(stanza, "cancel", "item-not-found", "Recipient not in room"));
282 end
283 end
284 end
285
286 local function room_handle_to_room(self, origin, stanza) -- presence changes and groupchat messages, along with disco/etc
287 local type = stanza.attr.type;
288 if stanza.name == "iq" and type == "get" then -- disco requests
289 local xmlns = stanza.tags[1].attr.xmlns;
290 if xmlns == "http://jabber.org/protocol/disco#info" then
291 origin.send(room_get_disco_info(self, stanza));
292 elseif xmlns == "http://jabber.org/protocol/disco#items" then
293 origin.send(room_get_disco_items(self, stanza));
294 else
295 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
296 end
297 elseif stanza.name == "message" and type == "groupchat" then
298 local from, to = stanza.attr.from, stanza.attr.to;
299 local room = jid_bare(to);
300 local current_nick = self._jid_nick[from];
301 if not current_nick then -- not in room
302 origin.send(st.error_reply(stanza, "cancel", "not-acceptable"));
303 else
304 local from = stanza.attr.from;
305 stanza.attr.from = current_nick;
306 local subject = getText(stanza, {"subject"});
307 if subject then
308 self:set_subject(current_nick, subject); -- TODO use broadcast_message_stanza
309 else
310 room_broadcast_message(self, stanza, true);
311 end
312 end
313 elseif stanza.name == "presence" then -- hack - some buggy clients send presence updates to the room rather than their nick
314 local to = stanza.attr.to;
315 local current_nick = self._jid_nick[stanza.attr.from];
316 if current_nick then
317 stanza.attr.to = current_nick;
318 room_handle_to_occupant(origin, stanza);
319 stanza.attr.to = to;
320 elseif type ~= "error" and type ~= "result" then
321 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
322 end
323 elseif stanza.name == "message" and not stanza.attr.type and #stanza.tags == 1 and self._jid_nick[stanza.attr.from]
324 and stanza.tags[1].name == "x" and stanza.tags[1].attr.xmlns == "http://jabber.org/protocol/muc#user" and #stanza.tags[1].tags == 1
325 and stanza.tags[1].tags[1].name == "invite" and stanza.tags[1].tags[1].attr.to then
326 local _from, _to = stanza.attr.from, stanza.attr.to;
327 local _invitee = stanza.tags[1].tags[1].attr.to;
328 stanza.attr.from, stanza.attr.to = _to, _invitee;
329 stanza.tags[1].tags[1].attr.from, stanza.tags[1].tags[1].attr.to = _from, nil;
330 self:route_stanza(stanza);
331 stanza.tags[1].tags[1].attr.from, stanza.tags[1].tags[1].attr.to = nil, _invitee;
332 stanza.attr.from, stanza.attr.to = _from, _to;
333 else
334 if type == "error" or type == "result" then return; end
335 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
336 end
337 end
338
339 local function room_handle_stanza(self, origin, stanza)
340 local to_node, to_host, to_resource = jid_split(stanza.attr.to);
341 if to_resource and not to_node then
342 if type == "error" or type == "result" then return; end
343 origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- host/resource
344 elseif to_resource then
345 room_handle_to_occupant(self, origin, stanza);
346 elseif to_node then
347 room_handle_to_room(self, origin, stanza)
348 else -- to the main muc domain
349 end
350 end
351
352 module "muc"
353
354 function new_room(jid)
355 return {
356 jid = jid;
357 handle_stanza = room_handle_stanza;
358 set_subject = room_set_subject;
359 route_stanza = function(room, stanza) end -- Replace with a routing function, e.g., function(room, stanza) core_route_stanza(origin, stanza); end
360 _jid_nick = {};
361 _participants = {};
362 _data = {};
363 }
364 end
365
366 return _M;
367
368 --[[function get_disco_info(stanza)
369 return st.iq({type='result', id=stanza.attr.id, from=muc_domain, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#info")
370 :tag("identity", {category='conference', type='text', name=muc_name}):up()
371 :tag("feature", {var="http://jabber.org/protocol/muc"}); -- TODO cache disco reply
372 end
373 function get_disco_items(stanza)
374 local reply = st.iq({type='result', id=stanza.attr.id, from=muc_domain, to=stanza.attr.from}):query("http://jabber.org/protocol/disco#items");
375 for room in pairs(rooms_info:get()) do
376 reply:tag("item", {jid=room, name=rooms_info:get(room, "name")}):up();
377 end
378 return reply; -- TODO cache disco reply
379 end]]
380
381 --[[function handle_to_domain(origin, stanza)
382 local type = stanza.attr.type;
383 if type == "error" or type == "result" then return; end
384 if stanza.name == "iq" and type == "get" then
385 local xmlns = stanza.tags[1].attr.xmlns;
386 if xmlns == "http://jabber.org/protocol/disco#info" then
387 origin.send(get_disco_info(stanza));
388 elseif xmlns == "http://jabber.org/protocol/disco#items" then
389 origin.send(get_disco_items(stanza));
390 else
391 origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- TODO disco/etc
392 end
393 else
394 origin.send(st.error_reply(stanza, "cancel", "service-unavailable", "The muc server doesn't deal with messages and presence directed at it"));
395 end
396 end
397
398 register_component(muc_domain, function(origin, stanza)
399 local to_node, to_host, to_resource = jid_split(stanza.attr.to);
400 if to_resource and not to_node then
401 if type == "error" or type == "result" then return; end
402 origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- host/resource
403 elseif to_resource then
404 handle_to_occupant(origin, stanza);
405 elseif to_node then
406 handle_to_room(origin, stanza)
407 else -- to the main muc domain
408 if type == "error" or type == "result" then return; end
409 handle_to_domain(origin, stanza);
410 end
411 end);]]
412
413 --[[module.unload = function()
414 deregister_component(muc_domain);
415 end
416 module.save = function()
417 return {rooms = rooms.data; jid_nick = jid_nick.data; rooms_info = rooms_info.data; persist_list = persist_list};
418 end
419 module.restore = function(data)
420 rooms.data, jid_nick.data, rooms_info.data, persist_list =
421 data.rooms or {}, data.jid_nick or {}, data.rooms_info or {}, data.persist_list or {};
422 end]]