author | Florian Zeitz <florob@babelmonkeys.de> |
Fri, 15 Feb 2013 01:32:03 +0100 | |
changeset 910 | c469a2b2d77d |
parent 909 | ec4c6e8f277d |
child 969 | 8eba9d4809d2 |
permissions | -rw-r--r-- |
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-- Prosody IM |
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-- Copyright (C) 2012 Florian Zeitz |
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-- |
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-- This project is MIT/X11 licensed. Please see the |
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-- COPYING file in the source package for more information. |
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-- |
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|
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module:set_global(); |
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local add_filter = require "util.filters".add_filter; |
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local sha1 = require "util.hashes".sha1; |
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local base64 = require "util.encodings".base64.encode; |
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local softreq = require "util.dependencies".softreq; |
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local portmanager = require "core.portmanager"; |
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local bit; |
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pcall(function() bit = require"bit"; end); |
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bit = bit or softreq"bit32" |
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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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local band = bit.band; |
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local bxor = bit.bxor; |
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local rshift = bit.rshift; |
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local cross_domain = module:get_option("cross_domain_websocket"); |
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if cross_domain then |
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if cross_domain == true then |
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cross_domain = "*"; |
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elseif type(cross_domain) == "table" then |
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cross_domain = table.concat(cross_domain, ", "); |
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end |
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if type(cross_domain) ~= "string" then |
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cross_domain = nil; |
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end |
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end |
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module:depends("c2s") |
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local sessions = module:shared("c2s/sessions"); |
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local c2s_listener = portmanager.get_service("c2s").listener; |
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-- Websocket helpers |
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local function parse_frame(frame) |
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local result = {}; |
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local pos = 1; |
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local length_bytes = 0; |
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local counter = 0; |
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local tmp_byte; |
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if #frame < 2 then return; end |
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tmp_byte = string.byte(frame, pos); |
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result.FIN = band(tmp_byte, 0x80) > 0; |
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result.RSV1 = band(tmp_byte, 0x40) > 0; |
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result.RSV2 = band(tmp_byte, 0x20) > 0; |
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result.RSV3 = band(tmp_byte, 0x10) > 0; |
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result.opcode = band(tmp_byte, 0x0F); |
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pos = pos + 1; |
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tmp_byte = string.byte(frame, pos); |
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result.MASK = band(tmp_byte, 0x80) > 0; |
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result.length = band(tmp_byte, 0x7F); |
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|
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if result.length == 126 then |
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length_bytes = 2; |
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result.length = 0; |
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elseif result.length == 127 then |
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length_bytes = 8; |
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result.length = 0; |
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end |
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if #frame < (2 + length_bytes) then return; end |
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for i = 1, length_bytes do |
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pos = pos + 1; |
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result.length = result.length * 256 + string.byte(frame, pos); |
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end |
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if #frame < (2 + length_bytes + (result.MASK and 4 or 0) + result.length) then return; end |
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if result.MASK then |
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result.key = {string.byte(frame, pos+1), string.byte(frame, pos+2), |
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string.byte(frame, pos+3), string.byte(frame, pos+4)} |
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pos = pos + 5; |
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result.data = ""; |
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for i = pos, pos + result.length - 1 do |
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result.data = result.data .. string.char(bxor(result.key[counter+1], string.byte(frame, i))); |
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counter = (counter + 1) % 4; |
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end |
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else |
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result.data = frame:sub(pos + 1, pos + result.length); |
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end |
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return result, 2 + length_bytes + (result.MASK and 4 or 0) + result.length; |
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end |
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local function build_frame(desc) |
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local length; |
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local result = ""; |
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local data = desc.data or ""; |
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result = result .. string.char(0x80 * (desc.FIN and 1 or 0) + desc.opcode); |
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length = #data; |
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if length <= 125 then -- 7-bit length |
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result = result .. string.char(length); |
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elseif length <= 0xFFFF then -- 2-byte length |
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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 |
910
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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 |
690
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diff
changeset
|
167 |
|
842
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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 |
32df4d13f178
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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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changeset
|
177 |
|
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changeset
|
178 |
if (frame.opcode == 0x1 or frame.opcode == 0x2) and dataBuffer then |
32df4d13f178
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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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changeset
|
182 |
|
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changeset
|
183 |
-- Valid cases |
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changeset
|
184 |
if frame.opcode == 0x0 then -- Continuation frame |
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|
185 |
dataBuffer = dataBuffer .. frame.data; |
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diff
changeset
|
186 |
elseif frame.opcode == 0x1 then -- Text frame |
32df4d13f178
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diff
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|
187 |
dataBuffer = frame.data; |
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diff
changeset
|
188 |
elseif frame.opcode == 0x2 then -- Binary frame |
32df4d13f178
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diff
changeset
|
189 |
websocket_close(1003, "Only text frames are supported"); |
895
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|
190 |
return; |
842
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diff
changeset
|
191 |
elseif frame.opcode == 0x8 then -- Close request |
32df4d13f178
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diff
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|
192 |
websocket_close(1000, "Goodbye"); |
895
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|
193 |
return; |
691
04662cc35280
mod_websocket: Answer ping frames
Florian Zeitz <florob@babelmonkeys.de>
parents:
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diff
changeset
|
194 |
elseif frame.opcode == 0x9 then -- Ping frame |
04662cc35280
mod_websocket: Answer ping frames
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diff
changeset
|
195 |
frame.opcode = 0xA; |
04662cc35280
mod_websocket: Answer ping frames
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diff
changeset
|
196 |
conn:write(build_frame(frame)); |
895
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|
197 |
return ""; |
690
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mod_websocket: Add fragmentation support
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diff
changeset
|
198 |
else |
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changeset
|
199 |
log("warn", "Received frame with unsupported opcode %i", frame.opcode); |
895
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|
200 |
return ""; |
690
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diff
changeset
|
201 |
end |
676
54fa9d6d7809
mod_websocket: New mod_c2s based version, still WIP
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parents:
129
diff
changeset
|
202 |
|
690
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diff
changeset
|
203 |
if frame.FIN then |
842
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|
204 |
data = dataBuffer; |
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|
205 |
dataBuffer = nil; |
690
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diff
changeset
|
206 |
|
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changeset
|
207 |
return data; |
676
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diff
changeset
|
208 |
end |
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diff
changeset
|
209 |
return ""; |
842
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diff
changeset
|
210 |
end |
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changeset
|
211 |
|
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changeset
|
212 |
conn:setlistener(c2s_listener); |
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changeset
|
213 |
c2s_listener.onconnect(conn); |
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changeset
|
214 |
|
842
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changeset
|
215 |
local frameBuffer = ""; |
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|
216 |
add_filter(sessions[conn], "bytes/in", function(data) |
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|
217 |
local cache = ""; |
842
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|
218 |
frameBuffer = frameBuffer .. data; |
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changeset
|
219 |
local frame, length = parse_frame(frameBuffer); |
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changeset
|
220 |
|
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|
221 |
while frame do |
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changeset
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222 |
frameBuffer = frameBuffer:sub(length + 1); |
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local result = handle_frame(frame); |
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if not result then return; end |
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cache = cache .. result; |
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frame, length = parse_frame(frameBuffer); |
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end |
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return cache; |
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229 |
|
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end); |
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231 |
|
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add_filter(sessions[conn], "bytes/out", function(data) |
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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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response.status = "101 Switching Protocols"; |
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response.headers.upgrade = "websocket"; |
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response.headers.connection = "Upgrade"; |
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response.headers.sec_webSocket_accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11")); |
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response.headers.sec_webSocket_protocol = "xmpp"; |
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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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function module.add_host(module) |
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module:depends("http"); |
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module:provides("http", { |
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name = "websocket"; |
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default_path = "xmpp-websocket"; |
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route = { |
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["GET"] = handle_request; |
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["GET /"] = handle_request; |
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254 |
}; |
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255 |
}); |
129 | 256 |
end |