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annotate mod_websocket/mod_websocket.lua @ 1026:e254cf49e14d

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mod_websocket: Call string and table functions through locals
author Florian Zeitz <florob@babelmonkeys.de>
date Thu, 30 May 2013 22:51:12 +0200
parents b56a9aa171b3
children 6a2dfa8af421
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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;
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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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diff changeset
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
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144
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145 if not wants_xmpp then
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146 return 501;
129
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147 end
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148
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149 local function websocket_close(code, message)
1026
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150 local data = s_char(rshift(code, 8)) .. s_char(code%0x100) .. message;
842
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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
842
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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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diff changeset
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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diff changeset
193 elseif frame.opcode == 0x1 then -- Text frame
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diff changeset
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");
895
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197 return;
842
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198 elseif frame.opcode == 0x8 then -- Close request
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199 websocket_close(1000, "Goodbye");
895
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200 return;
691
04662cc35280 mod_websocket: Answer ping frames
Florian Zeitz <florob@babelmonkeys.de>
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diff changeset
201 elseif frame.opcode == 0x9 then -- Ping frame
04662cc35280 mod_websocket: Answer ping frames
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202 frame.opcode = 0xA;
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203 conn:write(build_frame(frame));
895
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204 return "";
690
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205 else
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206 log("warn", "Received frame with unsupported opcode %i", frame.opcode);
895
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207 return "";
690
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diff changeset
208 end
676
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diff changeset
209
690
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diff changeset
210 if frame.FIN then
842
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
211 data = dataBuffer;
32df4d13f178 mod_websocket: More robust frame handling
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212 dataBuffer = nil;
690
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diff changeset
213
895
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diff changeset
214 return data;
676
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diff changeset
215 end
895
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216 return "";
842
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217 end
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218
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diff changeset
219 conn:setlistener(c2s_listener);
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diff changeset
220 c2s_listener.onconnect(conn);
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221
842
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diff changeset
222 local frameBuffer = "";
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diff changeset
223 add_filter(sessions[conn], "bytes/in", function(data)
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diff changeset
224 local cache = "";
842
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diff changeset
225 frameBuffer = frameBuffer .. data;
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diff changeset
226 local frame, length = parse_frame(frameBuffer);
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
227
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
228 while frame do
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229 frameBuffer = frameBuffer:sub(length + 1);
895
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diff changeset
230 local result = handle_frame(frame);
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diff changeset
231 if not result then return; end
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diff changeset
232 cache = cache .. result;
842
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diff changeset
233 frame, length = parse_frame(frameBuffer);
32df4d13f178 mod_websocket: More robust frame handling
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diff changeset
234 end
895
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diff changeset
235 return cache;
676
54fa9d6d7809 mod_websocket: New mod_c2s based version, still WIP
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diff changeset
236
844
a0987c0e4e1d mod_websocket: Check whether the xmpp sub-protocol was requested
Florian Zeitz <florob@babelmonkeys.de>
parents: 842
diff changeset
237 end);
a0987c0e4e1d mod_websocket: Check whether the xmpp sub-protocol was requested
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parents: 842
diff changeset
238
895
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diff changeset
239 add_filter(sessions[conn], "bytes/out", function(data)
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diff changeset
240 return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)});
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
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diff changeset
241 end);
842
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diff changeset
242
969
8eba9d4809d2 mod_websocket: Set status_code instead of status
Florian Zeitz <florob@babelmonkeys.de>
parents: 910
diff changeset
243 response.status_code = 101;
895
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diff changeset
244 response.headers.upgrade = "websocket";
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diff changeset
245 response.headers.connection = "Upgrade";
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parents: 857
diff changeset
246 response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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diff changeset
247 response.headers.sec_webSocket_protocol = "xmpp";
1f4d77104da5 mod_websocket: Simplify by getting the c2s_listener from mod_c2s
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diff changeset
248 response.headers.access_control_allow_origin = cross_domain;
676
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parents: 129
diff changeset
249
54fa9d6d7809 mod_websocket: New mod_c2s based version, still WIP
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parents: 129
diff changeset
250 return "";
129
5fc00a3e47b5 mod_websocket: Initial commit
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parents:
diff changeset
251 end
676
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diff changeset
252
688
e87678a52720 mod_websocket: Make this a shared module
Florian Zeitz <florob@babelmonkeys.de>
parents: 687
diff changeset
253 function module.add_host(module)
e87678a52720 mod_websocket: Make this a shared module
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parents: 687
diff changeset
254 module:depends("http");
676
54fa9d6d7809 mod_websocket: New mod_c2s based version, still WIP
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parents: 129
diff changeset
255 module:provides("http", {
909
ec4c6e8f277d mod_websocket: Change the HTTP name to websocket, and override the default_path instead
Florian Zeitz <florob@babelmonkeys.de>
parents: 905
diff changeset
256 name = "websocket";
ec4c6e8f277d mod_websocket: Change the HTTP name to websocket, and override the default_path instead
Florian Zeitz <florob@babelmonkeys.de>
parents: 905
diff changeset
257 default_path = "xmpp-websocket";
676
54fa9d6d7809 mod_websocket: New mod_c2s based version, still WIP
Florian Zeitz <florob@babelmonkeys.de>
parents: 129
diff changeset
258 route = {
849
6e2ec1825182 mod_websocket: Accept GET request without trailing /
Florian Zeitz <florob@babelmonkeys.de>
parents: 844
diff changeset
259 ["GET"] = handle_request;
6e2ec1825182 mod_websocket: Accept GET request without trailing /
Florian Zeitz <florob@babelmonkeys.de>
parents: 844
diff changeset
260 ["GET /"] = handle_request;
676
54fa9d6d7809 mod_websocket: New mod_c2s based version, still WIP
Florian Zeitz <florob@babelmonkeys.de>
parents: 129
diff changeset
261 };
54fa9d6d7809 mod_websocket: New mod_c2s based version, still WIP
Florian Zeitz <florob@babelmonkeys.de>
parents: 129
diff changeset
262 });
129
5fc00a3e47b5 mod_websocket: Initial commit
Ali Sabil <ali.sabil@gmail.com>
parents:
diff changeset
263 end