prosody
6f75f8043936
plugins/mod_websocket.lua

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plugins/mod_websocket.lua @ 6397:6f75f8043936

mod_websocket: Initial commit (based on the prosody-modules version)
author Florian Zeitz <florob@babelmonkeys.de>
date Fri, 05 Sep 2014 03:47:39 +0200
child 6793:2bf1b7e2149a
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6397
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1 -- Prosody IM
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2 -- Copyright (C) 2012-2014 Florian Zeitz
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3 --
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4 -- This project is MIT/X11 licensed. Please see the
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5 -- COPYING file in the source package for more information.
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6 --
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7
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8 module:set_global();
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9
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10 local add_filter = require "util.filters".add_filter;
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11 local sha1 = require "util.hashes".sha1;
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12 local base64 = require "util.encodings".base64.encode;
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13 local st = require "util.stanza";
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14 local parse_xml = require "util.xml".parse;
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15 local portmanager = require "core.portmanager";
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16 local sm_destroy_session = sessionmanager.destroy_session;
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17 local log = module._log;
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18
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19 local websocket_frames = require"net.websocket.frames";
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20 local parse_frame = websocket_frames.parse;
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21 local build_frame = websocket_frames.build;
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22 local build_close = websocket_frames.build_close;
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23 local parse_close = websocket_frames.parse_close;
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24
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25 local t_concat = table.concat;
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26
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27 local consider_websocket_secure = module:get_option_boolean("consider_websocket_secure");
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28 local cross_domain = module:get_option("cross_domain_websocket");
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29 if cross_domain then
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30 if cross_domain == true then
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31 cross_domain = "*";
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32 elseif type(cross_domain) == "table" then
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33 cross_domain = t_concat(cross_domain, ", ");
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34 end
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35 if type(cross_domain) ~= "string" then
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36 cross_domain = nil;
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37 end
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38 end
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39
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40 local xmlns_framing = "urn:ietf:params:xml:ns:xmpp-framing";
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41 local xmlns_streams = "http://etherx.jabber.org/streams";
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42 local xmlns_client = "jabber:client";
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43 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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44
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45 module:depends("c2s")
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46 local sessions = module:shared("c2s/sessions");
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47 local c2s_listener = portmanager.get_service("c2s").listener;
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48
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49 --- Session methods
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50 local function session_open_stream(session)
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51 local attr = {
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52 xmlns = xmlns_framing,
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53 version = "1.0",
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54 id = session.streamid or "",
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55 from = session.host
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56 };
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57 session.send(st.stanza("open", attr));
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58 end
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59
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60 local function session_close(session, reason)
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61 local log = session.log or log;
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62 if session.conn then
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63 if session.notopen then
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64 session:open_stream();
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65 end
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66 if reason then -- nil == no err, initiated by us, false == initiated by client
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67 local stream_error = st.stanza("stream:error");
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68 if type(reason) == "string" then -- assume stream error
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69 stream_error:tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' });
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70 elseif type(reason) == "table" then
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71 if reason.condition then
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72 stream_error:tag(reason.condition, stream_xmlns_attr):up();
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73 if reason.text then
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74 stream_error:tag("text", stream_xmlns_attr):text(reason.text):up();
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75 end
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76 if reason.extra then
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77 stream_error:add_child(reason.extra);
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78 end
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79 elseif reason.name then -- a stanza
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80 stream_error = reason;
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81 end
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82 end
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83 log("debug", "Disconnecting client, <stream:error> is: %s", tostring(stream_error));
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84 session.send(stream_error);
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85 end
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86
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87 session.send(st.stanza("close", { xmlns = xmlns_framing }));
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88 function session.send() return false; end
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89
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90 local reason = (reason and (reason.name or reason.text or reason.condition)) or reason;
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91 session.log("debug", "c2s stream for %s closed: %s", session.full_jid or ("<"..session.ip..">"), reason or "session closed");
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92
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93 -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
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94 local conn = session.conn;
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95 if reason == nil and not session.notopen and session.type == "c2s" then
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96 -- Grace time to process data from authenticated cleanly-closed stream
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97 add_task(stream_close_timeout, function ()
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98 if not session.destroyed then
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99 session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
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100 sm_destroy_session(session, reason);
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101 conn:write(build_close(1000, "Stream closed"));
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102 conn:close();
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103 end
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104 end);
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105 else
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106 sm_destroy_session(session, reason);
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107 conn:write(build_close(1000, "Stream closed"));
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108 conn:close();
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109 end
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110 end
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111 end
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112
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113
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114 --- Filters
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115 local function filter_open_close(data)
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116 if not data:find(xmlns_framing, 1, true) then return data; end
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117
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118 local oc = parse_xml(data);
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119 if not oc then return data; end
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120 if oc.attr.xmlns ~= xmlns_framing then return data; end
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121 if oc.name == "close" then return "</stream:stream>"; end
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122 if oc.name == "open" then
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123 oc.name = "stream:stream";
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124 oc.attr.xmlns = nil;
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125 oc.attr["xmlns:stream"] = xmlns_streams;
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126 return oc:top_tag();
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127 end
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128
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129 return data;
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130 end
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131 function handle_request(event, path)
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132 local request, response = event.request, event.response;
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133 local conn = response.conn;
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134
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135 if not request.headers.sec_websocket_key then
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136 response.headers.content_type = "text/html";
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137 return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
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138 <p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p>
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139 </body></html>]];
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140 end
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141
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142 local wants_xmpp = false;
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143 (request.headers.sec_websocket_protocol or ""):gsub("([^,]*),?", function (proto)
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144 if proto == "xmpp" then wants_xmpp = true; end
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145 end);
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146
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147 if not wants_xmpp then
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148 return 501;
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149 end
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150
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151 local function websocket_close(code, message)
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152 conn:write(build_close(code, message));
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153 conn:close();
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154 end
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155
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156 local dataBuffer;
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157 local function handle_frame(frame)
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158 local opcode = frame.opcode;
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159 local length = frame.length;
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160 module:log("debug", "Websocket received frame: opcode=%0x, %i bytes", frame.opcode, #frame.data);
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161
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162 -- Error cases
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163 if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero
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164 websocket_close(1002, "Reserved bits not zero");
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165 return false;
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166 end
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167
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168 if opcode == 0x8 then -- close frame
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169 if length == 1 then
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170 websocket_close(1002, "Close frame with payload, but too short for status code");
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171 return false;
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172 elseif length >= 2 then
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173 local status_code = parse_close(frame.data)
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174 if status_code < 1000 then
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175 websocket_close(1002, "Closed with invalid status code");
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176 return false;
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177 elseif ((status_code > 1003 and status_code < 1007) or status_code > 1011) and status_code < 3000 then
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178 websocket_close(1002, "Closed with reserved status code");
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179 return false;
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180 end
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181 end
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182 end
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183
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184 if opcode >= 0x8 then
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185 if length > 125 then -- Control frame with too much payload
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186 websocket_close(1002, "Payload too large");
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187 return false;
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188 end
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189
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190 if not frame.FIN then -- Fragmented control frame
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191 websocket_close(1002, "Fragmented control frame");
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192 return false;
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193 end
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194 end
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195
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196 if (opcode > 0x2 and opcode < 0x8) or (opcode > 0xA) then
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197 websocket_close(1002, "Reserved opcode");
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198 return false;
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199 end
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200
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201 if opcode == 0x0 and not dataBuffer then
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202 websocket_close(1002, "Unexpected continuation frame");
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203 return false;
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204 end
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205
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206 if (opcode == 0x1 or opcode == 0x2) and dataBuffer then
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207 websocket_close(1002, "Continuation frame expected");
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208 return false;
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209 end
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210
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211 -- Valid cases
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212 if opcode == 0x0 then -- Continuation frame
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213 dataBuffer[#dataBuffer+1] = frame.data;
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214 elseif opcode == 0x1 then -- Text frame
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215 dataBuffer = {frame.data};
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216 elseif opcode == 0x2 then -- Binary frame
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217 websocket_close(1003, "Only text frames are supported");
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218 return;
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219 elseif opcode == 0x8 then -- Close request
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220 websocket_close(1000, "Goodbye");
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221 return;
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222 elseif opcode == 0x9 then -- Ping frame
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223 frame.opcode = 0xA;
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224 conn:write(build_frame(frame));
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225 return "";
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226 elseif opcode == 0xA then -- Pong frame
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227 module:log("warn", "Received unexpected pong frame: " .. tostring(frame.data));
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228 return "";
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229 else
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230 log("warn", "Received frame with unsupported opcode %i", opcode);
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231 return "";
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232 end
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233
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234 if frame.FIN then
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235 local data = t_concat(dataBuffer, "");
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236 dataBuffer = nil;
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237 return data;
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238 end
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239 return "";
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240 end
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241
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242 conn:setlistener(c2s_listener);
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243 c2s_listener.onconnect(conn);
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244
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245 local session = sessions[conn];
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246
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247 session.secure = consider_websocket_secure or session.secure;
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248
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249 session.open_stream = session_open_stream;
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250 session.close = session_close;
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251
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252 local frameBuffer = "";
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253 add_filter(session, "bytes/in", function(data)
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254 local cache = {};
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255 frameBuffer = frameBuffer .. data;
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256 local frame, length = parse_frame(frameBuffer);
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257
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258 while frame do
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259 frameBuffer = frameBuffer:sub(length + 1);
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260 local result = handle_frame(frame);
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261 if not result then return; end
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262 cache[#cache+1] = filter_open_close(result);
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263 frame, length = parse_frame(frameBuffer);
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264 end
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265 return t_concat(cache, "");
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266 end);
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267
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268 add_filter(session, "stanzas/out", function(stanza)
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269 local attr = stanza.attr;
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270 attr.xmlns = attr.xmlns or xmlns_client;
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271 if stanza.name:find("^stream:") then
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272 attr["xmlns:stream"] = attr["xmlns:stream"] or xmlns_streams;
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273 end
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274 return stanza;
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275 end);
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276
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277 add_filter(session, "bytes/out", function(data)
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278 return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
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279 end);
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280
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281 response.status_code = 101;
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282 response.headers.upgrade = "websocket";
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283 response.headers.connection = "Upgrade";
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284 response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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285 response.headers.sec_webSocket_protocol = "xmpp";
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286 response.headers.access_control_allow_origin = cross_domain;
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287
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288 return "";
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289 end
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290
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291 function module.add_host(module)
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292 module:depends("http");
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293 module:provides("http", {
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294 name = "websocket";
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295 default_path = "xmpp-websocket";
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296 route = {
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297 ["GET"] = handle_request;
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298 ["GET /"] = handle_request;
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299 };
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300 });
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301 end