|
1 |
|
2 module.host = "*" -- Global module |
|
3 |
|
4 local lxp = require "lxp"; |
|
5 local init_xmlhandlers = require "core.xmlhandlers" |
|
6 local server = require "net.server"; |
|
7 local httpserver = require "net.httpserver"; |
|
8 local sm = require "core.sessionmanager"; |
|
9 local new_uuid = require "util.uuid".generate; |
|
10 local fire_event = require "core.eventmanager".fire_event; |
|
11 local core_process_stanza = core_process_stanza; |
|
12 local st = require "util.stanza"; |
|
13 local log = require "util.logger".init("bosh"); |
|
14 local stream_callbacks = { stream_tag = "http://jabber.org/protocol/httpbind|body" }; |
|
15 |
|
16 local xmlns_bosh = "http://jabber.org/protocol/httpbind"; -- (hard-coded into a literal in session.send) |
|
17 |
|
18 local BOSH_DEFAULT_HOLD = 1; |
|
19 local BOSH_DEFAULT_INACTIVITY = 30; |
|
20 local BOSH_DEFAULT_POLLING = 5; |
|
21 local BOSH_DEFAULT_REQUESTS = 2; |
|
22 local BOSH_DEFAULT_MAXPAUSE = 120; |
|
23 |
|
24 local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat; |
|
25 local os_time = os.time; |
|
26 |
|
27 local sessions = {}; |
|
28 |
|
29 -- Used to respond to idle sessions |
|
30 local waiting_requests = {}; |
|
31 function on_destroy_request(request) |
|
32 waiting_requests[request] = nil; |
|
33 end |
|
34 |
|
35 function handle_request(method, body, request) |
|
36 if (not body) or request.method ~= "POST" then |
|
37 --return { status = "200 OK", headers = { ["Content-Type"] = "text/html" }, body = "<html><body>You don't look like a BOSH client to me... what do you want?</body></html>" }; |
|
38 return "<html><body>You really don't look like a BOSH client to me... what do you want?</body></html>"; |
|
39 end |
|
40 if not method then |
|
41 log("debug", "Request %s suffered error %s", tostring(request.id), body); |
|
42 return; |
|
43 end |
|
44 log("debug", "Handling new request %s: %s\n----------", request.id, tostring(body)); |
|
45 request.notopen = true; |
|
46 request.log = log; |
|
47 local parser = lxp.new(init_xmlhandlers(request, stream_callbacks), "|"); |
|
48 |
|
49 parser:parse(body); |
|
50 |
|
51 local session = sessions[request.sid]; |
|
52 if session then |
|
53 local r = session.requests; |
|
54 log("debug", "Session %s has %d out of %d requests open", request.sid, #r, session.bosh_hold); |
|
55 log("debug", "and there are %d things in the send_buffer", #session.send_buffer); |
|
56 if #r > session.bosh_hold then |
|
57 -- We are holding too many requests, send what's in the buffer, |
|
58 log("debug", "We are holding too many requests, so..."); |
|
59 if #session.send_buffer > 0 then |
|
60 log("debug", "...sending what is in the buffer") |
|
61 session.send(t_concat(session.send_buffer)); |
|
62 session.send_buffer = {}; |
|
63 return; |
|
64 else |
|
65 -- or an empty response |
|
66 log("debug", "...sending an empty response"); |
|
67 session.send(""); |
|
68 return; |
|
69 end |
|
70 elseif #session.send_buffer > 0 then |
|
71 log("debug", "Session has data in the send buffer, will send now.."); |
|
72 local resp = t_concat(session.send_buffer); |
|
73 session.send_buffer = {}; |
|
74 session.send(resp); |
|
75 return; |
|
76 end |
|
77 |
|
78 if not request.destroyed and session.bosh_wait then |
|
79 request.reply_before = os_time() + session.bosh_wait; |
|
80 request.on_destroy = on_destroy_request; |
|
81 waiting_requests[request] = true; |
|
82 end |
|
83 |
|
84 log("debug", "Had nothing to say, so leaving request unanswered for now"); |
|
85 return true; |
|
86 end |
|
87 end |
|
88 |
|
89 local function bosh_reset_stream(session) session.notopen = true; end |
|
90 local function bosh_close_stream(session, reason) end |
|
91 |
|
92 function stream_callbacks.streamopened(request, attr) |
|
93 print("Attr:") |
|
94 for k,v in pairs(attr) do print("", k, v); end |
|
95 log("debug", "BOSH body open (sid: %s)", attr.sid); |
|
96 local sid = attr.sid |
|
97 if not sid then |
|
98 -- TODO: Sanity checks here (rid, to, known host, etc.) |
|
99 request.notopen = nil; -- Signals that we accept this opening tag |
|
100 |
|
101 -- New session |
|
102 sid = tostring(new_uuid()); |
|
103 local session = { type = "c2s_unauthed", conn = {}, sid = sid, rid = attr.rid, host = attr.to, bosh_version = attr.ver, bosh_wait = attr.wait, streamid = sid, |
|
104 bosh_hold = BOSH_DEFAULT_HOLD, |
|
105 requests = { }, send_buffer = {}, reset_stream = bosh_reset_stream, close = bosh_close_stream }; |
|
106 sessions[sid] = session; |
|
107 log("info", "New BOSH session, assigned it sid '%s'", sid); |
|
108 local r, send_buffer = session.requests, session.send_buffer; |
|
109 local response = { } |
|
110 function session.send(s) |
|
111 log("debug", "Sending BOSH data: %s", tostring(s)); |
|
112 local oldest_request = r[1]; |
|
113 while oldest_request and oldest_request.destroyed do |
|
114 t_remove(r, 1); |
|
115 waiting_requests[oldest_request] = nil; |
|
116 oldest_request = r[1]; |
|
117 end |
|
118 if oldest_request then |
|
119 log("debug", "We have an open request, so using that to send with"); |
|
120 response.body = t_concat{"<body xmlns='http://jabber.org/protocol/httpbind' sid='", sid, "' xmlns:stream = 'http://etherx.jabber.org/streams'>", tostring(s), "</body>" }; |
|
121 oldest_request:send(response); |
|
122 log("debug", "Sent"); |
|
123 if oldest_request.stayopen then |
|
124 if #r>1 then |
|
125 -- Move front request to back |
|
126 t_insert(r, oldest_request); |
|
127 t_remove(r, 1); |
|
128 end |
|
129 else |
|
130 log("debug", "Destroying the request now..."); |
|
131 oldest_request:destroy(); |
|
132 t_remove(r, 1); |
|
133 end |
|
134 elseif s ~= "" then |
|
135 log("debug", "Saved to send buffer because there are %d open requests", #r); |
|
136 -- Hmm, no requests are open :( |
|
137 t_insert(session.send_buffer, tostring(s)); |
|
138 log("debug", "There are now %d things in the send_buffer", #session.send_buffer); |
|
139 end |
|
140 end |
|
141 |
|
142 -- Send creation response |
|
143 |
|
144 local features = st.stanza("stream:features"); |
|
145 fire_event("stream-features", session, features); |
|
146 --xmpp:version='1.0' xmlns:xmpp='urn:xmpp:xbosh' |
|
147 local response = st.stanza("body", { xmlns = xmlns_bosh, |
|
148 inactivity = "30", polling = "5", requests = "2", hold = tostring(session.bosh_hold), maxpause = "120", |
|
149 sid = sid, ver = '1.6', from = session.host, secure = 'true', ["xmpp:version"] = "1.0", |
|
150 ["xmlns:xmpp"] = "urn:xmpp:xbosh", ["xmlns:stream"] = "http://etherx.jabber.org/streams" }):add_child(features); |
|
151 request:send(tostring(response)); |
|
152 |
|
153 request.sid = sid; |
|
154 return; |
|
155 end |
|
156 |
|
157 local session = sessions[sid]; |
|
158 if not session then |
|
159 -- Unknown sid |
|
160 log("info", "Client tried to use sid '%s' which we don't know about", sid); |
|
161 request:send(tostring(st.stanza("body", { xmlns = xmlns_bosh, type = "terminate", condition = "item-not-found" }))); |
|
162 request.notopen = nil; |
|
163 return; |
|
164 end |
|
165 |
|
166 if session.notopen then |
|
167 local features = st.stanza("stream:features"); |
|
168 fire_event("stream-features", session, features); |
|
169 session.send(features); |
|
170 session.notopen = nil; |
|
171 end |
|
172 |
|
173 request.notopen = nil; -- Signals that we accept this opening tag |
|
174 t_insert(session.requests, request); |
|
175 request.sid = sid; |
|
176 end |
|
177 |
|
178 function stream_callbacks.handlestanza(request, stanza) |
|
179 log("debug", "BOSH stanza received: %s\n", stanza:pretty_print()); |
|
180 local session = sessions[request.sid]; |
|
181 if session then |
|
182 if stanza.attr.xmlns == xmlns_bosh then |
|
183 stanza.attr.xmlns = "jabber:client"; |
|
184 end |
|
185 core_process_stanza(session, stanza); |
|
186 end |
|
187 end |
|
188 |
|
189 function on_timer() |
|
190 log("debug", "Checking for requests soon to timeout..."); |
|
191 -- Identify requests timing out within the next few seconds |
|
192 local now = os_time() + 3; |
|
193 for request in pairs(waiting_requests) do |
|
194 if request.reply_before <= now then |
|
195 log("debug", "%s was soon to timeout, sending empty response", request.id); |
|
196 -- Send empty response to let the |
|
197 -- client know we're still here |
|
198 if request.conn then |
|
199 sessions[request.sid].send(""); |
|
200 end |
|
201 else |
|
202 log("debug", "%s timing out in %ds [destroyed: %s]", request.id, request.reply_before - now, tostring(request.destroyed)); |
|
203 end |
|
204 if not request.on_destroy then |
|
205 log("warn", "%s has no on_destroy!", request.id); |
|
206 end |
|
207 end |
|
208 end |
|
209 |
|
210 httpserver.new{ port = 5280, base = "http-bind", handler = handle_request, ssl = false} |
|
211 server.addtimer(on_timer); |