prosody-modules
1f4d77104da5
mod_websocket/mod_websocket.lua

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mod_websocket/mod_websocket.lua @ 895:1f4d77104da5

mod_websocket: Simplify by getting the c2s_listener from mod_c2s
author Florian Zeitz <florob@babelmonkeys.de>
date Sat, 12 Jan 2013 17:33:52 +0100
parent 857:1393af36ec9c
child 905:eae665bc2122
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1 -- Prosody IM
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2 -- Copyright (C) 2012 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 softreq = require "util.dependencies".softreq;
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14 local portmanager = require "core.portmanager";
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15
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16 local bit = softreq"bit" or softreq"bit32" or module:log("error", "No bit module found. Either LuaJIT 2 or Lua 5.2 is required");
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17 local band = bit.band;
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18 local bxor = bit.bxor;
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19
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20 local cross_domain = module:get_option("cross_domain_websocket");
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21 if cross_domain then
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22 if cross_domain == true then
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23 cross_domain = "*";
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24 elseif type(cross_domain) == "table" then
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25 cross_domain = table.concat(cross_domain, ", ");
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26 end
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27 if type(cross_domain) ~= "string" then
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28 cross_domain = nil;
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29 end
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30 end
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31
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32 module:depends("c2s")
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33 local sessions = module:shared("c2s/sessions");
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34 local c2s_listener = portmanager.get_service("c2s").listener;
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35
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36 -- Websocket helpers
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37 local function parse_frame(frame)
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38 local result = {};
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39 local pos = 1;
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40 local length_bytes = 0;
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41 local counter = 0;
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42 local tmp_byte;
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43
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44 if #frame < 2 then return; end
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45
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46 tmp_byte = string.byte(frame, pos);
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47 result.FIN = band(tmp_byte, 0x80) > 0;
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48 result.RSV1 = band(tmp_byte, 0x40) > 0;
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49 result.RSV2 = band(tmp_byte, 0x20) > 0;
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50 result.RSV3 = band(tmp_byte, 0x10) > 0;
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51 result.opcode = band(tmp_byte, 0x0F);
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52
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53 pos = pos + 1;
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54 tmp_byte = string.byte(frame, pos);
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55 result.MASK = band(tmp_byte, 0x80) > 0;
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56 result.length = band(tmp_byte, 0x7F);
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57
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58 if result.length == 126 then
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59 length_bytes = 2;
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60 result.length = 0;
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61 elseif result.length == 127 then
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62 length_bytes = 8;
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63 result.length = 0;
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64 end
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65
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66 if #frame < (2 + length_bytes) then return; end
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67
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68 for i = 1, length_bytes do
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69 pos = pos + 1;
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70 result.length = result.length * 256 + string.byte(frame, pos);
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71 end
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72
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73 if #frame < (2 + length_bytes + (result.MASK and 4 or 0) + result.length) then return; end
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74
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75 if result.MASK then
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76 result.key = {string.byte(frame, pos+1), string.byte(frame, pos+2),
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77 string.byte(frame, pos+3), string.byte(frame, pos+4)}
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78
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79 pos = pos + 5;
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80 result.data = "";
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81 for i = pos, pos + result.length - 1 do
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82 result.data = result.data .. string.char(bxor(result.key[counter+1], string.byte(frame, i)));
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83 counter = (counter + 1) % 4;
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84 end
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85 else
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86 result.data = frame:sub(pos + 1, pos + result.length);
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87 end
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88
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89 return result, 2 + length_bytes + (result.MASK and 4 or 0) + result.length;
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90 end
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91
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92 local function build_frame(desc)
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93 local length;
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94 local result = "";
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95 local data = desc.data or "";
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96
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97 result = result .. string.char(0x80 * (desc.FIN and 1 or 0) + desc.opcode);
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98
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99 length = #data;
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100 if length <= 125 then -- 7-bit length
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101 result = result .. string.char(length);
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102 elseif length <= 0xFFFF then -- 2-byte length
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103 result = result .. string.char(126);
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104 result = result .. string.char(length/0x100) .. string.char(length%0x100);
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105 else -- 8-byte length
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106 result = result .. string.char(127);
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107 for i = 7, 0, -1 do
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108 result = result .. string.char(( length / (2^(8*i)) ) % 0x100);
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109 end
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110 end
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111
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112 result = result .. data;
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113
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114 return result;
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115 end
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116
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117 --- Filter stuff
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118 function handle_request(event, path)
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119 local request, response = event.request, event.response;
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120 local conn = response.conn;
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121
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122 if not request.headers.sec_websocket_key then
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123 response.headers.content_type = "text/html";
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124 return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
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125 <p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p>
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126 </body></html>]];
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127 end
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128
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129 local wants_xmpp = false;
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130 (request.headers.sec_websocket_protocol or ""):gsub("([^,]*),?", function (proto)
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131 if proto == "xmpp" then wants_xmpp = true; end
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132 end);
129
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133
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134 if not wants_xmpp then
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135 return 501;
129
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136 end
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137
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138 local function websocket_close(code, message)
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139 local data = string.char(code/0x100) .. string.char(code%0x100) .. message;
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140 conn:write(build_frame({opcode = 0x8, FIN = true, data = data}));
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141 conn:close();
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142 end
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143
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144 local dataBuffer;
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145 local function handle_frame(frame)
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146 module:log("debug", "Websocket received: %s (%i bytes)", frame.data, #frame.data);
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147
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148 -- Error cases
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149 if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero
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150 websocket_close(1002, "Reserved bits not zero");
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151 return false;
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152 end
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153
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154 if frame.opcode >= 0x8 and frame.length > 125 then -- Control frame with too much payload
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155 websocket_close(1002, "Payload too large");
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156 return false;
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157 end
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158
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159 if frame.opcode >= 0x8 and not frame.FIN then -- Fragmented control frame
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160 websocket_close(1002, "Fragmented control frame");
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161 return false;
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162 end
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163
842
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164 if (frame.opcode > 0x2 and frame.opcode < 0x8) or (frame.opcode > 0xA) then
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165 websocket_close(1002, "Reserved opcode");
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166 return false;
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167 end
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168
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169 if frame.opcode == 0x0 and not dataBuffer then
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170 websocket_close(1002, "Unexpected continuation frame");
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171 return false;
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172 end
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173
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174 if (frame.opcode == 0x1 or frame.opcode == 0x2) and dataBuffer then
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175 websocket_close(1002, "Continuation frame expected");
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176 return false;
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177 end
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178
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179 -- Valid cases
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180 if frame.opcode == 0x0 then -- Continuation frame
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181 dataBuffer = dataBuffer .. frame.data;
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182 elseif frame.opcode == 0x1 then -- Text frame
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183 dataBuffer = frame.data;
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184 elseif frame.opcode == 0x2 then -- Binary frame
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185 websocket_close(1003, "Only text frames are supported");
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186 return;
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187 elseif frame.opcode == 0x8 then -- Close request
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188 websocket_close(1000, "Goodbye");
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189 return;
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190 elseif frame.opcode == 0x9 then -- Ping frame
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191 frame.opcode = 0xA;
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192 conn:write(build_frame(frame));
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193 return "";
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194 else
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195 log("warn", "Received frame with unsupported opcode %i", frame.opcode);
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196 return "";
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197 end
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198
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199 if frame.FIN then
842
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200 data = dataBuffer;
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201 dataBuffer = nil;
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202
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203 return data;
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204 end
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205 return "";
842
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206 end
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207
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208 conn:setlistener(c2s_listener);
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209 c2s_listener.onconnect(conn);
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210
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211 local frameBuffer = "";
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212 add_filter(sessions[conn], "bytes/in", function(data)
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213 local cache = "";
842
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214 frameBuffer = frameBuffer .. data;
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215 local frame, length = parse_frame(frameBuffer);
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216
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217 while frame do
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218 frameBuffer = frameBuffer:sub(length + 1);
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219 local result = handle_frame(frame);
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220 if not result then return; end
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diff changeset
221 cache = cache .. result;
842
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222 frame, length = parse_frame(frameBuffer);
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223 end
895
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224 return cache;
676
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diff changeset
225
844
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diff changeset
226 end);
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diff changeset
227
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228 add_filter(sessions[conn], "bytes/out", function(data)
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229 return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
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230 end);
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231
676
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diff changeset
232 response.status = "101 Switching Protocols";
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233 response.headers.upgrade = "websocket";
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234 response.headers.connection = "Upgrade";
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235 response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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236 response.headers.sec_webSocket_protocol = "xmpp";
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diff changeset
237 response.headers.access_control_allow_origin = cross_domain;
676
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diff changeset
238
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diff changeset
239 return "";
129
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parents:
diff changeset
240 end
676
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diff changeset
241
688
e87678a52720 mod_websocket: Make this a shared module
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diff changeset
242 function module.add_host(module)
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diff changeset
243 module:depends("http");
676
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diff changeset
244 module:provides("http", {
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diff changeset
245 name = "xmpp-websocket";
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diff changeset
246 route = {
849
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diff changeset
247 ["GET"] = handle_request;
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diff changeset
248 ["GET /"] = handle_request;
676
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diff changeset
249 };
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diff changeset
250 });
129
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parents:
diff changeset
251 end