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comparison mod_websocket/mod_websocket.lua @ 129:5fc00a3e47b5

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mod_websocket: Initial commit
author Ali Sabil <ali.sabil@gmail.com>
date Mon, 08 Feb 2010 12:29:30 +0100
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children 54fa9d6d7809
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128:bdd1641c159d 129:5fc00a3e47b5
1 module.host = "*" -- Global module
2
3 local logger = require "util.logger";
4 local log = logger.init("mod_websocket");
5 local httpserver = require "net.httpserver";
6 local lxp = require "lxp";
7 local init_xmlhandlers = require "core.xmlhandlers";
8 local st = require "util.stanza";
9 local sm = require "core.sessionmanager";
10
11 local sessions = {};
12 local default_headers = { };
13
14
15 local stream_callbacks = { default_ns = "jabber:client",
16 streamopened = sm.streamopened,
17 streamclosed = sm.streamclosed,
18 handlestanza = core_process_stanza };
19 function stream_callbacks.error(session, error, data)
20 if error == "no-stream" then
21 session.log("debug", "Invalid opening stream header");
22 session:close("invalid-namespace");
23 elseif session.close then
24 (session.log or log)("debug", "Client XML parse error: %s", tostring(error));
25 session:close("xml-not-well-formed");
26 end
27 end
28
29
30 local function session_reset_stream(session)
31 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
32 session.parser = parser;
33
34 session.notopen = true;
35
36 function session.data(conn, data)
37 data, _ = data:gsub("[%z\255]", "")
38 log("debug", "Parsing: %s", data)
39
40 local ok, err = parser:parse(data)
41 if not ok then
42 log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data,
43 data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
44 session:close("xml-not-well-formed");
45 end
46 end
47 end
48
49 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
50 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
51 local function session_close(session, reason)
52 local log = session.log or log;
53 if session.conn then
54 if session.notopen then
55 session.send("<?xml version='1.0'?>");
56 session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
57 end
58 if reason then
59 if type(reason) == "string" then -- assume stream error
60 log("info", "Disconnecting client, <stream:error> is: %s", reason);
61 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
62 elseif type(reason) == "table" then
63 if reason.condition then
64 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
65 if reason.text then
66 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
67 end
68 if reason.extra then
69 stanza:add_child(reason.extra);
70 end
71 log("info", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
72 session.send(stanza);
73 elseif reason.name then -- a stanza
74 log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));
75 session.send(reason);
76 end
77 end
78 end
79 session.send("</stream:stream>");
80 session.conn:close();
81 websocket_listener.ondisconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");
82 end
83 end
84
85
86 local websocket_listener = { default_mode = "*a" };
87 function websocket_listener.onincoming(conn, data)
88 local session = sessions[conn];
89 if not session then
90 session = { type = "c2s_unauthed",
91 conn = conn,
92 reset_stream = session_reset_stream,
93 close = session_close,
94 dispatch_stanza = stream_callbacks.handlestanza,
95 log = logger.init("websocket"),
96 secure = conn.ssl };
97
98 function session.send(s)
99 conn:write("\00" .. tostring(s) .. "\255");
100 end
101
102 sessions[conn] = session;
103 end
104
105 session_reset_stream(session);
106
107 if data then
108 session.data(conn, data);
109 end
110 end
111
112 function websocket_listener.ondisconnect(conn, err)
113 local session = sessions[conn];
114 if session then
115 (session.log or log)("info", "Client disconnected: %s", err);
116 sm.destroy_session(session, err);
117 sessions[conn] = nil;
118 session = nil;
119 end
120 end
121
122
123 function handle_request(method, body, request)
124 if request.method ~= "GET" or request.headers["upgrade"] ~= "WebSocket" or request.headers["connection"] ~= "Upgrade" then
125 if request.method == "OPTIONS" then
126 return { headers = default_headers, body = "" };
127 else
128 return "<html><body>You really don't look like a Websocket client to me... what do you want?</body></html>";
129 end
130 end
131
132 local subprotocol = request.headers["Websocket-Protocol"];
133 if subprotocol ~= nil and subprotocol ~= "XMPP" then
134 return "<html><body>You really don't look like an XMPP Websocket client to me... what do you want?</body></html>";
135 end
136
137 if not method then
138 log("debug", "Request %s suffered error %s", tostring(request.id), body);
139 return;
140 end
141
142 request.conn:setlistener(websocket_listener);
143 request.write("HTTP/1.1 101 Web Socket Protocol Handshake\r\n");
144 request.write("Upgrade: WebSocket\r\n");
145 request.write("Connection: Upgrade\r\n");
146 request.write("WebSocket-Origin: file://\r\n"); -- FIXME
147 request.write("WebSocket-Location: ws://localhost:5281/xmpp-websocket\r\n"); -- FIXME
148 request.write("WebSocket-Protocol: XMPP\r\n");
149 request.write("\r\n");
150
151 return true;
152 end
153
154 local function setup()
155 local ports = module:get_option("websocket_ports") or { 5281 };
156 httpserver.new_from_config(ports, handle_request, { base = "xmpp-websocket" });
157 end
158 if prosody.start_time then -- already started
159 setup();
160 else
161 prosody.events.add_handler("server-started", setup);
162 end