123 lines
3.2 KiB
Lua
123 lines
3.2 KiB
Lua
--[[
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websocket client pure lua implement for love2d
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by flaribbit
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usage:
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local client = require("websocket").new()
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client:connect("127.0.0.1", 5000)
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client:settimeout(0)
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client:send("hello from love2d")
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print(client:read())
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client:close()
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]]
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-- local debug_print=print
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local socket = require"socket"
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local bit = require"bit"
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local band, bor, bxor = bit.band, bit.bor, bit.bxor
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local shl, shr = bit.lshift, bit.rshift
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local OPCODES = {
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CONTINUE=0,
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TEXT =1,
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BINARY =2,
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CLOSE =8,
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PING =9,
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PONG =10,
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}
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local _M = {
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OPCODES = OPCODES,
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}
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_M.__index = _M
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function _M.new()
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local m = {}
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setmetatable(m, _M)
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return m
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end
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local seckey = "osT3F7mvlojIvf3/8uIsJQ=="
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function _M.connect(self, host, port, path)
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local SOCK = socket.tcp()
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self.socket = SOCK
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local res, err = SOCK:connect(host, port)
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if res~=1 then return res, err end
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-- debug_print("[handshake] connected")
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-- WebSocket handshake
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res, err = SOCK:send("GET "..(path or"/").." HTTP/1.1\r\nHost: "..host..":"..port.."\r\nConnection: Upgrade\r\nUpgrade: websocket\r\nSec-WebSocket-Version: 13\r\nSec-WebSocket-Key: "..seckey.."\r\n\r\n")
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repeat res = SOCK:receive("*l") until res==""
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-- debug_print("[handshake] succeed")
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end
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function _M.send(self, message)
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local SOCK = self.socket
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local mask_key = {1, 14, 5, 14}
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-- message type
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SOCK:send(string.char(bor(0x80, OPCODES.BINARY)))
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-- length
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local length = #message
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-- debug_print("[encode] message length: "..length)
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if length>65535 then
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SOCK:send(string.char(bor(127, 0x80), 0, 0, 0, 0,
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band(shr(length, 24), 0xff),
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band(shr(length, 16), 0xff),
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band(shr(length, 8), 0xff),
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band(length, 0xff)))
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elseif length>125 then
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SOCK:send(string.char(bor(126, 0x80),
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band(shr(length, 8), 0xff),
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band(length, 0xff)))
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else
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SOCK:send(string.char(bor(length, 0x80)))
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end
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-- debug_print("[encode] masking")
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SOCK:send(string.char(unpack(mask_key)))
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local msgbyte = {message:byte(1, length)}
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for i = 1, length do
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msgbyte[i] = bxor(msgbyte[i], mask_key[(i-1)%4+1])
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end
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SOCK:send(string.char(unpack(msgbyte)))
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-- debug_print("[encode] end")
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end
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function _M.read(self)
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-- byte 0-1
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local SOCK = self.socket
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local res, err = SOCK:receive(2)
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if res==nil then return res, err end
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-- local flag_FIN = res:byte()>=0x80
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-- local OPCODE = band(res:byte(), 0x0f)
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-- local flag_MASK = res:byte(2)>=0x80
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-- debug_print("[decode] FIN="..tostring(flag_FIN)..", OPCODE="..OPCODE..", MASK="..tostring(flag_MASK))
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-- length
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local byte = res:byte(2)
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local length = band(byte, 0x7f)
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if length==126 then
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res = SOCK:receive(2)
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local b1, b2 = res:byte(1, 2)
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length = shl(b1, 8) + b2
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elseif length==127 then
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res = SOCK:receive(8)
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local b = {res:byte(1, 8)}
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length = shl(b[5], 32) + shl(b[6], 24) + shl(b[7], 8) + b[8]
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end
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-- debug_print("[decode] message length: "..length)
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-- data
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res = SOCK:receive(length)
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-- debug_print("[decode] string length: "..#res)
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-- debug_print("[decode] end")
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return res
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end
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function _M.close(self) self.socket:close() end
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function _M.settimeout(self, t) self.socket:settimeout(t) end
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return _M |