2 -- Copyright (C) 2008-2009 Matthew Wild
3 -- Copyright (C) 2008-2009 Waqas Hussain
5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information.
9 module.host = "*" -- Global module
11 local hosts = _G.hosts;
12 local lxp = require "lxp";
13 local init_xmlhandlers = require "core.xmlhandlers"
14 local server = require "net.server";
15 local httpserver = require "net.httpserver";
16 local sm = require "core.sessionmanager";
17 local sm_destroy_session = sm.destroy_session;
18 local new_uuid = require "util.uuid".generate;
19 local fire_event = require "core.eventmanager".fire_event;
20 local core_process_stanza = core_process_stanza;
21 local st = require "util.stanza";
22 local logger = require "util.logger";
23 local log = logger.init("mod_bosh");
25 local xmlns_bosh = "http://jabber.org/protocol/httpbind"; -- (hard-coded into a literal in session.send)
26 local stream_callbacks = { stream_ns = "http://jabber.org/protocol/httpbind", stream_tag = "body", default_ns = xmlns_bosh };
28 local BOSH_DEFAULT_HOLD = tonumber(module:get_option("bosh_default_hold")) or 1;
29 local BOSH_DEFAULT_INACTIVITY = tonumber(module:get_option("bosh_max_inactivity")) or 60;
30 local BOSH_DEFAULT_POLLING = tonumber(module:get_option("bosh_max_polling")) or 5;
31 local BOSH_DEFAULT_REQUESTS = tonumber(module:get_option("bosh_max_requests")) or 2;
32 local BOSH_DEFAULT_MAXPAUSE = tonumber(module:get_option("bosh_max_pause")) or 300;
34 local default_headers = { ["Content-Type"] = "text/xml; charset=utf-8" };
35 local session_close_reply = { headers = default_headers, body = st.stanza("body", { xmlns = xmlns_bosh, type = "terminate" }), attr = {} };
37 local cross_domain = module:get_option("cross_domain_bosh");
39 default_headers["Access-Control-Allow-Methods"] = "GET, POST, OPTIONS";
40 default_headers["Access-Control-Allow-Headers"] = "Content-Type";
41 default_headers["Access-Control-Max-Age"] = "7200";
43 if cross_domain == true then
44 default_headers["Access-Control-Allow-Origin"] = "*";
45 elseif type(cross_domain) == "table" then
46 cross_domain = table.concat(cross_domain, ", ");
48 if type(cross_domain) == "string" then
49 default_headers["Access-Control-Allow-Origin"] = cross_domain;
53 local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
54 local os_time = os.time;
57 local inactive_sessions = {}; -- Sessions which have no open requests
59 -- Used to respond to idle sessions (those with waiting requests)
60 local waiting_requests = {};
61 function on_destroy_request(request)
62 waiting_requests[request] = nil;
63 local session = sessions[request.sid];
65 local requests = session.requests;
66 for i,r in pairs(requests) do
67 if r == request then requests[i] = nil; break; end
70 -- If this session now has no requests open, mark it as inactive
71 if #requests == 0 and session.bosh_max_inactive and not inactive_sessions[session] then
72 inactive_sessions[session] = os_time();
73 (session.log or log)("debug", "BOSH session marked as inactive at %d", inactive_sessions[session]);
78 function handle_request(method, body, request)
79 if (not body) or request.method ~= "POST" then
80 if request.method == "OPTIONS" then
81 return { headers = default_headers, body = "" };
83 return "<html><body>You really don't look like a BOSH client to me... what do you want?</body></html>";
87 log("debug", "Request %s suffered error %s", tostring(request.id), body);
90 --log("debug", "Handling new request %s: %s\n----------", request.id, tostring(body));
91 request.notopen = true;
93 local parser = lxp.new(init_xmlhandlers(request, stream_callbacks), "\1");
97 local session = sessions[request.sid];
99 local r = session.requests;
100 log("debug", "Session %s has %d out of %d requests open", request.sid, #r, session.bosh_hold);
101 log("debug", "and there are %d things in the send_buffer", #session.send_buffer);
102 if #r > session.bosh_hold then
103 -- We are holding too many requests, send what's in the buffer,
104 log("debug", "We are holding too many requests, so...");
105 if #session.send_buffer > 0 then
106 log("debug", "...sending what is in the buffer")
107 session.send(t_concat(session.send_buffer));
108 session.send_buffer = {};
110 -- or an empty response
111 log("debug", "...sending an empty response");
114 elseif #session.send_buffer > 0 then
115 log("debug", "Session has data in the send buffer, will send now..");
116 local resp = t_concat(session.send_buffer);
117 session.send_buffer = {};
121 if not request.destroyed and session.bosh_wait then
122 request.reply_before = os_time() + session.bosh_wait;
123 request.on_destroy = on_destroy_request;
124 waiting_requests[request] = true;
127 log("debug", "Have nothing to say, so leaving request unanswered for now");
133 local function bosh_reset_stream(session) session.notopen = true; end
135 local function bosh_close_stream(session, reason)
136 (session.log or log)("info", "BOSH client disconnected");
137 session_close_reply.attr.condition = reason;
138 for _, held_request in ipairs(session.requests) do
139 held_request:send(session_close_reply);
140 held_request:destroy();
142 sessions[session.sid] = nil;
143 sm_destroy_session(session);
146 function stream_callbacks.streamopened(request, attr)
147 log("debug", "BOSH body open (sid: %s)", attr.sid);
150 -- New session request
151 request.notopen = nil; -- Signals that we accept this opening tag
153 -- TODO: Sanity checks here (rid, to, known host, etc.)
154 if not hosts[attr.to] then
156 log("debug", "BOSH client tried to connect to unknown host: %s", tostring(attr.to));
157 session_close_reply.body.attr.condition = "host-unknown";
158 request:send(session_close_reply);
159 request.notopen = nil
165 local session = { type = "c2s_unauthed", conn = {}, sid = sid, rid = tonumber(attr.rid), host = attr.to, bosh_version = attr.ver, bosh_wait = attr.wait, streamid = sid,
166 bosh_hold = BOSH_DEFAULT_HOLD, bosh_max_inactive = BOSH_DEFAULT_INACTIVITY,
167 requests = { }, send_buffer = {}, reset_stream = bosh_reset_stream, close = bosh_close_stream,
168 dispatch_stanza = core_process_stanza, log = logger.init("bosh"..sid), secure = request.secure };
169 sessions[sid] = session;
171 log("info", "New BOSH session, assigned it sid '%s'", sid);
172 local r, send_buffer = session.requests, session.send_buffer;
173 local response = { headers = default_headers }
174 function session.send(s)
175 --log("debug", "Sending BOSH data: %s", tostring(s));
176 local oldest_request = r[1];
177 while oldest_request and oldest_request.destroyed do
179 waiting_requests[oldest_request] = nil;
180 oldest_request = r[1];
182 if oldest_request then
183 log("debug", "We have an open request, so sending on that");
184 response.body = t_concat{"<body xmlns='http://jabber.org/protocol/httpbind' sid='", sid, "' xmlns:stream = 'http://etherx.jabber.org/streams'>", tostring(s), "</body>" };
185 oldest_request:send(response);
186 --log("debug", "Sent");
187 if oldest_request.stayopen then
189 -- Move front request to back
190 t_insert(r, oldest_request);
194 log("debug", "Destroying the request now...");
195 oldest_request:destroy();
199 log("debug", "Saved to send buffer because there are %d open requests", #r);
200 -- Hmm, no requests are open :(
201 t_insert(session.send_buffer, tostring(s));
202 log("debug", "There are now %d things in the send_buffer", #session.send_buffer);
206 -- Send creation response
208 local features = st.stanza("stream:features");
209 hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
210 fire_event("stream-features", session, features);
211 --xmpp:version='1.0' xmlns:xmpp='urn:xmpp:xbosh'
212 local response = st.stanza("body", { xmlns = xmlns_bosh,
213 inactivity = tostring(BOSH_DEFAULT_INACTIVITY), polling = tostring(BOSH_DEFAULT_POLLING), requests = tostring(BOSH_DEFAULT_REQUESTS), hold = tostring(session.bosh_hold), maxpause = "120",
214 sid = sid, authid = sid, ver = '1.6', from = session.host, secure = 'true', ["xmpp:version"] = "1.0",
215 ["xmlns:xmpp"] = "urn:xmpp:xbosh", ["xmlns:stream"] = "http://etherx.jabber.org/streams" }):add_child(features);
216 request:send{ headers = default_headers, body = tostring(response) };
222 local session = sessions[sid];
225 log("info", "Client tried to use sid '%s' which we don't know about", sid);
226 request:send{ headers = default_headers, body = tostring(st.stanza("body", { xmlns = xmlns_bosh, type = "terminate", condition = "item-not-found" })) };
227 request.notopen = nil;
232 local rid = tonumber(attr.rid);
233 local diff = rid - session.rid;
235 session.log("warn", "rid too large (means a request was lost). Last rid: %d New rid: %s", session.rid, attr.rid);
236 elseif diff <= 0 then
238 session.log("debug", "rid repeated (on request %s), ignoring: %d", request.id, session.rid);
239 request.notopen = nil;
240 t_insert(session.requests, request);
246 if attr.type == "terminate" then
247 -- Client wants to end this session
249 request.notopen = nil;
253 -- If session was inactive, make sure it is now marked as not
254 if #session.requests == 0 then
255 (session.log or log)("debug", "BOSH client now active again at %d", os_time());
256 inactive_sessions[session] = nil;
259 if session.notopen then
260 local features = st.stanza("stream:features");
261 hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
262 fire_event("stream-features", session, features);
263 session.send(features);
264 session.notopen = nil;
267 request.notopen = nil; -- Signals that we accept this opening tag
268 t_insert(session.requests, request);
272 function stream_callbacks.handlestanza(request, stanza)
273 log("debug", "BOSH stanza received: %s\n", stanza:top_tag());
274 local session = sessions[request.sid];
276 if stanza.attr.xmlns == xmlns_bosh then
277 stanza.attr.xmlns = "jabber:client";
279 session.ip = request.handler:ip();
280 core_process_stanza(session, stanza);
284 local dead_sessions = {};
286 -- log("debug", "Checking for requests soon to timeout...");
287 -- Identify requests timing out within the next few seconds
288 local now = os_time() + 3;
289 for request in pairs(waiting_requests) do
290 if request.reply_before <= now then
291 log("debug", "%s was soon to timeout, sending empty response", request.id);
292 -- Send empty response to let the
293 -- client know we're still here
295 sessions[request.sid].send("");
301 local n_dead_sessions = 0;
302 for session, inactive_since in pairs(inactive_sessions) do
303 if session.bosh_max_inactive then
304 if now - inactive_since > session.bosh_max_inactive then
305 (session.log or log)("debug", "BOSH client inactive too long, destroying session at %d", now);
306 sessions[session.sid] = nil;
307 inactive_sessions[session] = nil;
308 n_dead_sessions = n_dead_sessions + 1;
309 dead_sessions[n_dead_sessions] = session;
312 inactive_sessions[session] = nil;
316 for i=1,n_dead_sessions do
317 local session = dead_sessions[i];
318 dead_sessions[i] = nil;
319 sm_destroy_session(session, "BOSH client silent for over "..session.bosh_max_inactive.." seconds");
324 local function setup()
325 local ports = module:get_option("bosh_ports") or { 5280 };
326 httpserver.new_from_config(ports, handle_request, { base = "http-bind" });
327 server.addtimer(on_timer);
329 if prosody.start_time then -- already started
332 prosody.events.add_handler("server-started", setup);