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