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mod_websocket/mod_websocket.lua @ 945:dbcbcec37d24
mod_pubsub_twitter: Plugin to subscribe (poll) to Twitter search queries, and announce matching tweets over pubsub
author | Matthew Wild <mwild1@gmail.com> |
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date | Wed, 03 Apr 2013 14:40:03 +0100 |
parent | 910:c469a2b2d77d |
child | 969:8eba9d4809d2 |
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 cross_domain = module:get_option("cross_domain_websocket"); |
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25 if cross_domain then |
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26 if cross_domain == true then |
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27 cross_domain = "*"; |
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28 elseif type(cross_domain) == "table" then |
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29 cross_domain = table.concat(cross_domain, ", "); |
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30 end |
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31 if type(cross_domain) ~= "string" then |
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32 cross_domain = nil; |
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33 end |
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34 end |
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35 |
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36 module:depends("c2s") |
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37 local sessions = module:shared("c2s/sessions"); |
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38 local c2s_listener = portmanager.get_service("c2s").listener; |
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39 |
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40 -- Websocket helpers |
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41 local function parse_frame(frame) |
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42 local result = {}; |
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43 local pos = 1; |
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44 local length_bytes = 0; |
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45 local counter = 0; |
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46 local tmp_byte; |
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47 |
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48 if #frame < 2 then return; end |
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49 |
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50 tmp_byte = string.byte(frame, pos); |
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51 result.FIN = band(tmp_byte, 0x80) > 0; |
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52 result.RSV1 = band(tmp_byte, 0x40) > 0; |
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53 result.RSV2 = band(tmp_byte, 0x20) > 0; |
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54 result.RSV3 = band(tmp_byte, 0x10) > 0; |
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55 result.opcode = band(tmp_byte, 0x0F); |
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56 |
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57 pos = pos + 1; |
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58 tmp_byte = string.byte(frame, pos); |
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59 result.MASK = band(tmp_byte, 0x80) > 0; |
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60 result.length = band(tmp_byte, 0x7F); |
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61 |
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62 if result.length == 126 then |
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63 length_bytes = 2; |
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64 result.length = 0; |
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65 elseif result.length == 127 then |
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66 length_bytes = 8; |
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67 result.length = 0; |
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68 end |
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69 |
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70 if #frame < (2 + length_bytes) then return; end |
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71 |
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72 for i = 1, length_bytes do |
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73 pos = pos + 1; |
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74 result.length = result.length * 256 + string.byte(frame, pos); |
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75 end |
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76 |
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77 if #frame < (2 + length_bytes + (result.MASK and 4 or 0) + result.length) then return; end |
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78 |
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79 if result.MASK then |
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80 result.key = {string.byte(frame, pos+1), string.byte(frame, pos+2), |
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81 string.byte(frame, pos+3), string.byte(frame, pos+4)} |
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82 |
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83 pos = pos + 5; |
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84 result.data = ""; |
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85 for i = pos, pos + result.length - 1 do |
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86 result.data = result.data .. string.char(bxor(result.key[counter+1], string.byte(frame, i))); |
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87 counter = (counter + 1) % 4; |
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88 end |
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89 else |
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90 result.data = frame:sub(pos + 1, pos + result.length); |
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91 end |
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92 |
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93 return result, 2 + length_bytes + (result.MASK and 4 or 0) + result.length; |
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94 end |
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95 |
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96 local function build_frame(desc) |
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97 local length; |
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98 local result = ""; |
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99 local data = desc.data or ""; |
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100 |
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101 result = result .. string.char(0x80 * (desc.FIN and 1 or 0) + desc.opcode); |
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102 |
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103 length = #data; |
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104 if length <= 125 then -- 7-bit length |
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105 result = result .. string.char(length); |
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106 elseif length <= 0xFFFF then -- 2-byte length |
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107 result = result .. string.char(126); |
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108 result = result .. string.char(rshift(length, 8)) .. string.char(length%0x100); |
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109 else -- 8-byte length |
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110 result = result .. string.char(127); |
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111 for i = 7, 0, -1 do |
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112 result = result .. string.char(rshift(length, 8*i) % 0x100); |
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113 end |
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114 end |
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115 |
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116 result = result .. data; |
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117 |
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118 return result; |
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119 end |
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120 |
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121 --- Filter stuff |
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122 function handle_request(event, path) |
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123 local request, response = event.request, event.response; |
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124 local conn = response.conn; |
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125 |
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126 if not request.headers.sec_websocket_key then |
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127 response.headers.content_type = "text/html"; |
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128 return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body> |
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129 <p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p> |
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130 </body></html>]]; |
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131 end |
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132 |
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133 local wants_xmpp = false; |
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134 (request.headers.sec_websocket_protocol or ""):gsub("([^,]*),?", function (proto) |
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135 if proto == "xmpp" then wants_xmpp = true; end |
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136 end); |
129 | 137 |
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138 if not wants_xmpp then |
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139 return 501; |
129 | 140 end |
141 | |
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142 local function websocket_close(code, message) |
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143 local data = string.char(rshift(code, 8)) .. string.char(code%0x100) .. message; |
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144 conn:write(build_frame({opcode = 0x8, FIN = true, data = data})); |
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145 conn:close(); |
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146 end |
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147 |
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148 local dataBuffer; |
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149 local function handle_frame(frame) |
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150 module:log("debug", "Websocket received: %s (%i bytes)", frame.data, #frame.data); |
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151 |
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152 -- Error cases |
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153 if frame.RSV1 or frame.RSV2 or frame.RSV3 then -- Reserved bits non zero |
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154 websocket_close(1002, "Reserved bits not zero"); |
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155 return false; |
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156 end |
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157 |
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158 if frame.opcode >= 0x8 and frame.length > 125 then -- Control frame with too much payload |
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159 websocket_close(1002, "Payload too large"); |
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160 return false; |
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161 end |
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162 |
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163 if frame.opcode >= 0x8 and not frame.FIN then -- Fragmented control frame |
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164 websocket_close(1002, "Fragmented control frame"); |
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165 return false; |
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166 end |
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167 |
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168 if (frame.opcode > 0x2 and frame.opcode < 0x8) or (frame.opcode > 0xA) then |
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169 websocket_close(1002, "Reserved opcode"); |
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170 return false; |
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171 end |
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172 |
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173 if frame.opcode == 0x0 and not dataBuffer then |
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174 websocket_close(1002, "Unexpected continuation frame"); |
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175 return false; |
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176 end |
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177 |
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178 if (frame.opcode == 0x1 or frame.opcode == 0x2) and dataBuffer then |
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179 websocket_close(1002, "Continuation frame expected"); |
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180 return false; |
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181 end |
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182 |
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183 -- Valid cases |
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184 if frame.opcode == 0x0 then -- Continuation frame |
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185 dataBuffer = dataBuffer .. frame.data; |
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186 elseif frame.opcode == 0x1 then -- Text frame |
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187 dataBuffer = frame.data; |
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188 elseif frame.opcode == 0x2 then -- Binary frame |
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189 websocket_close(1003, "Only text frames are supported"); |
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190 return; |
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191 elseif frame.opcode == 0x8 then -- Close request |
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192 websocket_close(1000, "Goodbye"); |
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193 return; |
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194 elseif frame.opcode == 0x9 then -- Ping frame |
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195 frame.opcode = 0xA; |
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196 conn:write(build_frame(frame)); |
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197 return ""; |
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198 else |
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199 log("warn", "Received frame with unsupported opcode %i", frame.opcode); |
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200 return ""; |
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201 end |
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202 |
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203 if frame.FIN then |
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204 data = dataBuffer; |
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205 dataBuffer = nil; |
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206 |
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207 return data; |
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208 end |
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209 return ""; |
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210 end |
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211 |
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212 conn:setlistener(c2s_listener); |
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213 c2s_listener.onconnect(conn); |
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214 |
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215 local frameBuffer = ""; |
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216 add_filter(sessions[conn], "bytes/in", function(data) |
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217 local cache = ""; |
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218 frameBuffer = frameBuffer .. data; |
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219 local frame, length = parse_frame(frameBuffer); |
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220 |
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221 while frame do |
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222 frameBuffer = frameBuffer:sub(length + 1); |
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223 local result = handle_frame(frame); |
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224 if not result then return; end |
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225 cache = cache .. result; |
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226 frame, length = parse_frame(frameBuffer); |
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227 end |
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228 return cache; |
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229 |
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230 end); |
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231 |
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232 add_filter(sessions[conn], "bytes/out", function(data) |
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233 return build_frame({ FIN = true, opcode = 0x01, data = tostring(data)}); |
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234 end); |
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235 |
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236 response.status = "101 Switching Protocols"; |
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237 response.headers.upgrade = "websocket"; |
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238 response.headers.connection = "Upgrade"; |
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239 response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11")); |
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240 response.headers.sec_webSocket_protocol = "xmpp"; |
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241 response.headers.access_control_allow_origin = cross_domain; |
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242 |
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243 return ""; |
129 | 244 end |
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245 |
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246 function module.add_host(module) |
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247 module:depends("http"); |
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248 module:provides("http", { |
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249 name = "websocket"; |
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250 default_path = "xmpp-websocket"; |
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251 route = { |
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252 ["GET"] = handle_request; |
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253 ["GET /"] = handle_request; |
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254 }; |
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255 }); |
129 | 256 end |