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mod_websocket/mod_websocket.lua @ 1026:e254cf49e14d
mod_websocket: Call string and table functions through locals
author | Florian Zeitz <florob@babelmonkeys.de> |
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date | Thu, 30 May 2013 22:51:12 +0200 |
parent | 1025:b56a9aa171b3 |
child | 1027:6a2dfa8af421 |
rev | line source |
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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(); |
129 | 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; |
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17 pcall(function() bit = require"bit"; end); |
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18 bit = bit or softreq"bit32" |
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19 if not bit then module:log("error", "No bit module found. Either LuaJIT 2, lua-bitop or Lua 5.2 is required"); end |
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20 local band = bit.band; |
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21 local bxor = bit.bxor; |
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22 local rshift = bit.rshift; |
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23 |
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24 local t_concat = table.concat; |
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25 local s_byte = string.byte; |
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26 local s_char= string.char; |
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27 |
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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 module:depends("c2s") |
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41 local sessions = module:shared("c2s/sessions"); |
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42 local c2s_listener = portmanager.get_service("c2s").listener; |
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43 |
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44 -- Websocket helpers |
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45 local function parse_frame(frame) |
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46 local result = {}; |
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47 local pos = 1; |
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48 local length_bytes = 0; |
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49 local counter = 0; |
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50 local tmp_byte; |
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51 |
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52 if #frame < 2 then return; end |
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53 |
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54 tmp_byte = s_byte(frame, pos); |
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55 result.FIN = band(tmp_byte, 0x80) > 0; |
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56 result.RSV1 = band(tmp_byte, 0x40) > 0; |
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57 result.RSV2 = band(tmp_byte, 0x20) > 0; |
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58 result.RSV3 = band(tmp_byte, 0x10) > 0; |
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59 result.opcode = band(tmp_byte, 0x0F); |
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60 |
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61 pos = pos + 1; |
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62 tmp_byte = s_byte(frame, pos); |
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63 result.MASK = band(tmp_byte, 0x80) > 0; |
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64 result.length = band(tmp_byte, 0x7F); |
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65 |
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66 if result.length == 126 then |
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67 length_bytes = 2; |
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68 result.length = 0; |
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69 elseif result.length == 127 then |
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70 length_bytes = 8; |
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71 result.length = 0; |
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72 end |
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73 |
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74 if #frame < (2 + length_bytes) then return; end |
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75 |
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76 for i = 1, length_bytes do |
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77 pos = pos + 1; |
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78 result.length = result.length * 256 + s_byte(frame, pos); |
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79 end |
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80 |
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81 if #frame < (2 + length_bytes + (result.MASK and 4 or 0) + result.length) then return; end |
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82 |
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83 if result.MASK then |
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84 result.key = {s_byte(frame, pos+1), s_byte(frame, pos+2), |
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85 s_byte(frame, pos+3), s_byte(frame, pos+4)} |
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86 |
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87 pos = pos + 5; |
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88 result.data = ""; |
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89 for i = pos, pos + result.length - 1 do |
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90 result.data = result.data .. s_char(bxor(result.key[counter+1], s_byte(frame, i))); |
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91 counter = (counter + 1) % 4; |
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92 end |
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93 else |
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94 result.data = frame:sub(pos + 1, pos + result.length); |
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95 end |
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96 |
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97 return result, 2 + length_bytes + (result.MASK and 4 or 0) + result.length; |
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98 end |
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99 |
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100 local function build_frame(desc) |
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101 local length; |
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102 local result = ""; |
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103 local data = desc.data or ""; |
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104 |
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105 result = result .. s_char(0x80 * (desc.FIN and 1 or 0) + desc.opcode); |
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106 |
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107 length = #data; |
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108 if length <= 125 then -- 7-bit length |
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109 result = result .. s_char(length); |
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110 elseif length <= 0xFFFF then -- 2-byte length |
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111 result = result .. s_char(126); |
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112 result = result .. s_char(rshift(length, 8)) .. s_char(length%0x100); |
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113 else -- 8-byte length |
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114 local length_bytes = {}; |
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115 result = result .. s_char(127); |
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116 for i = 8, 1, -1 do |
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117 length_bytes[i] = s_char(length % 0x100); |
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118 length = rshift(length, 8); |
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119 end |
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120 result = result .. t_concat(length_bytes, ""); |
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121 end |
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122 |
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123 result = result .. data; |
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124 |
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125 return result; |
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126 end |
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127 |
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128 --- Filter stuff |
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129 function handle_request(event, path) |
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130 local request, response = event.request, event.response; |
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131 local conn = response.conn; |
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132 |
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133 if not request.headers.sec_websocket_key then |
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134 response.headers.content_type = "text/html"; |
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135 return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body> |
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136 <p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p> |
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137 </body></html>]]; |
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138 end |
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139 |
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140 local wants_xmpp = false; |
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141 (request.headers.sec_websocket_protocol or ""):gsub("([^,]*),?", function (proto) |
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142 if proto == "xmpp" then wants_xmpp = true; end |
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143 end); |
129 | 144 |
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145 if not wants_xmpp then |
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146 return 501; |
129 | 147 end |
148 | |
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149 local function websocket_close(code, message) |
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150 local data = s_char(rshift(code, 8)) .. s_char(code%0x100) .. message; |
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151 conn:write(build_frame({opcode = 0x8, FIN = true, data = data})); |
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152 conn:close(); |
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153 end |
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154 |
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155 local dataBuffer; |
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156 local function handle_frame(frame) |
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157 module:log("debug", "Websocket received: %s (%i bytes)", frame.data, #frame.data); |
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158 |
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159 -- Error cases |
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160 if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero |
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161 websocket_close(1002, "Reserved bits not zero"); |
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162 return false; |
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163 end |
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164 |
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165 if frame.opcode >= 0x8 and frame.length > 125 then -- Control frame with too much payload |
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166 websocket_close(1002, "Payload too large"); |
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167 return false; |
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168 end |
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169 |
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170 if frame.opcode >= 0x8 and not frame.FIN then -- Fragmented control frame |
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171 websocket_close(1002, "Fragmented control frame"); |
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172 return false; |
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173 end |
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174 |
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175 if (frame.opcode > 0x2 and frame.opcode < 0x8) or (frame.opcode > 0xA) then |
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176 websocket_close(1002, "Reserved opcode"); |
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177 return false; |
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178 end |
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179 |
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180 if frame.opcode == 0x0 and not dataBuffer then |
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181 websocket_close(1002, "Unexpected continuation frame"); |
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182 return false; |
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183 end |
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184 |
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185 if (frame.opcode == 0x1 or frame.opcode == 0x2) and dataBuffer then |
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186 websocket_close(1002, "Continuation frame expected"); |
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187 return false; |
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188 end |
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189 |
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190 -- Valid cases |
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191 if frame.opcode == 0x0 then -- Continuation frame |
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192 dataBuffer = dataBuffer .. frame.data; |
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193 elseif frame.opcode == 0x1 then -- Text frame |
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194 dataBuffer = frame.data; |
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195 elseif frame.opcode == 0x2 then -- Binary frame |
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196 websocket_close(1003, "Only text frames are supported"); |
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197 return; |
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198 elseif frame.opcode == 0x8 then -- Close request |
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199 websocket_close(1000, "Goodbye"); |
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200 return; |
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201 elseif frame.opcode == 0x9 then -- Ping frame |
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202 frame.opcode = 0xA; |
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203 conn:write(build_frame(frame)); |
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204 return ""; |
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205 else |
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206 log("warn", "Received frame with unsupported opcode %i", frame.opcode); |
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207 return ""; |
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208 end |
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209 |
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210 if frame.FIN then |
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211 data = dataBuffer; |
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212 dataBuffer = nil; |
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213 |
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214 return data; |
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215 end |
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216 return ""; |
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217 end |
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218 |
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219 conn:setlistener(c2s_listener); |
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220 c2s_listener.onconnect(conn); |
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221 |
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222 local frameBuffer = ""; |
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223 add_filter(sessions[conn], "bytes/in", function(data) |
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224 local cache = ""; |
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225 frameBuffer = frameBuffer .. data; |
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226 local frame, length = parse_frame(frameBuffer); |
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227 |
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228 while frame do |
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229 frameBuffer = frameBuffer:sub(length + 1); |
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230 local result = handle_frame(frame); |
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231 if not result then return; end |
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232 cache = cache .. result; |
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233 frame, length = parse_frame(frameBuffer); |
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234 end |
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235 return cache; |
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236 |
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237 end); |
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238 |
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239 add_filter(sessions[conn], "bytes/out", function(data) |
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240 return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)}); |
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241 end); |
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242 |
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243 response.status_code = 101; |
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244 response.headers.upgrade = "websocket"; |
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245 response.headers.connection = "Upgrade"; |
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246 response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11")); |
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247 response.headers.sec_webSocket_protocol = "xmpp"; |
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248 response.headers.access_control_allow_origin = cross_domain; |
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249 |
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250 return ""; |
129 | 251 end |
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252 |
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253 function module.add_host(module) |
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254 module:depends("http"); |
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255 module:provides("http", { |
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256 name = "websocket"; |
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257 default_path = "xmpp-websocket"; |
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258 route = { |
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259 ["GET"] = handle_request; |
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260 ["GET /"] = handle_request; |
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261 }; |
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262 }); |
129 | 263 end |