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S = TcpSocket.New(); | |
S.EventHandler = print; | |
S:Connect(<HOST>, 80); | |
S.ReconnectTimeout = 0; | |
function randomWebSocketKey() | |
return Crypto.Base64Encode(('x'):rep(16):gsub('.', function() return string.char(math.random(0,255)) end)); | |
end; | |
S.Connected = function() | |
Mode = 'HTTP'; | |
print('CONNECTED'); | |
S:Write(table.concat({ | |
'GET / HTTP/1.1', | |
'Host: <HOST>', | |
'Connection: Upgrade', | |
'Upgrade: websocket', | |
'Sec-WebSocket-Version: 13', | |
'Sec-WebSocket-Key: ' .. randomWebSocketKey() | |
}, '\r\n').. '\r\n\r\n'); | |
end; | |
function send(data) | |
print('> ' .. data); | |
local len, epl = #data, ''; | |
if len > 125 and len <= 0xffff then epl = bitstring.pack('16:int', len); len = 126; | |
elseif len > 125 and len < 2^53 then epl = bitstring.pack('64:int', len); len = 127; end | |
local frame = bitstring.pack('1:int, 3:int, 4:int 1:int 7:int', 1, 0, 1, 1, len) .. epl .. '\0\0\0\0' .. data; | |
S:Write(frame); | |
end; | |
Mode = 'HTTP'; | |
S.Data = function(sock) | |
if(Mode == 'HTTP') then | |
for http in function() return sock:ReadLine(TcpSocket.EOL.Custom, '\r\n\r\n'); end do | |
local code = http:match('^[^ ]+ (%d+)'); | |
if(code == '101') then | |
Mode = 'WS-INIT'; | |
send(<ON-CONNECT MESSAGE>); | |
end; | |
end; | |
end; | |
while(true) do | |
if(Mode == 'WS-INIT') then | |
if(sock.BufferLength < 2) then return; end; | |
local fin, rsv, opcode, mask, len = bitstring.unpack('1:int 3:int 4:int 1:int 7:int', sock:Read(2)); | |
local sbuf = Packet and Packet.fin and Packet.buf or nil; | |
Packet = { fin=fin, rsv=rsv, opcode=opcode, mask=mask, len=len }; | |
if(len > 125) then Mode = 'WS-EPL'; | |
else Mode = 'WS-PAYLOAD'; end; | |
end; | |
if(Mode == 'WS-EPL') then | |
if(Packet.len == 126) then | |
if(sock.BufferLength < 2) then return; end; | |
Packet.len = bitstring.unpack('16:int', sock:Read(2)); | |
Mode = 'WS-PAYLOAD'; | |
elseif(Packet.len == 127) then | |
if(sock.BufferLength < 8) then return; end; | |
Packet.len = bitstring.unpack('64:int', sock:Read(8)); | |
end; | |
end; | |
if(Mode == 'WS-PAYLOAD') then | |
if(sock.BufferLength < Packet.len) then return; end; | |
Mode = 'WS-INIT'; -- reset for handling of next frame | |
Buf = (Buf or '') .. sock:Read(Packet.len); | |
if(Packet.fin == 1) then | |
local msg = Buf; Buf = nil; | |
print('< ' .. msg); | |
local ok, data = pcall(json.decode, msg); | |
if(ok and data) then | |
-- handle message | |
end; | |
end; | |
end; | |
end; | |
end; | |
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