draft75.js
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'use strict';
var Base = require('./base'),
util = require('util');
var Draft75 = function(request, url, options) {
Base.apply(this, arguments);
this._stage = 0;
this.version = 'hixie-75';
this._headers.set('Upgrade', 'WebSocket');
this._headers.set('Connection', 'Upgrade');
this._headers.set('WebSocket-Origin', this._request.headers.origin);
this._headers.set('WebSocket-Location', this.url);
};
util.inherits(Draft75, Base);
var instance = {
close: function() {
if (this.readyState === 3) return false;
this.readyState = 3;
this.emit('close', new Base.CloseEvent(null, null));
return true;
},
parse: function(chunk) {
if (this.readyState > 1) return;
this._reader.put(chunk);
this._reader.eachByte(function(octet) {
var message;
switch (this._stage) {
case -1:
this._body.push(octet);
this._sendHandshakeBody();
break;
case 0:
this._parseLeadingByte(octet);
break;
case 1:
this._length = (octet & 0x7F) + 128 * this._length;
if (this._closing && this._length === 0) {
return this.close();
}
else if ((octet & 0x80) !== 0x80) {
if (this._length === 0) {
this._stage = 0;
}
else {
this._skipped = 0;
this._stage = 2;
}
}
break;
case 2:
if (octet === 0xFF) {
this._stage = 0;
message = new Buffer(this._buffer).toString('utf8', 0, this._buffer.length);
this.emit('message', new Base.MessageEvent(message));
}
else {
if (this._length) {
this._skipped += 1;
if (this._skipped === this._length)
this._stage = 0;
} else {
this._buffer.push(octet);
if (this._buffer.length > this._maxLength) return this.close();
}
}
break;
}
}, this);
},
frame: function(buffer) {
if (this.readyState === 0) return this._queue([buffer]);
if (this.readyState > 1) return false;
if (typeof buffer !== 'string') buffer = buffer.toString();
var payload = new Buffer(buffer, 'utf8'),
frame = new Buffer(payload.length + 2);
frame[0] = 0x00;
frame[payload.length + 1] = 0xFF;
payload.copy(frame, 1);
this._write(frame);
return true;
},
_handshakeResponse: function() {
var start = 'HTTP/1.1 101 Web Socket Protocol Handshake',
headers = [start, this._headers.toString(), ''];
return new Buffer(headers.join('\r\n'), 'utf8');
},
_parseLeadingByte: function(octet) {
if ((octet & 0x80) === 0x80) {
this._length = 0;
this._stage = 1;
} else {
delete this._length;
delete this._skipped;
this._buffer = [];
this._stage = 2;
}
}
};
for (var key in instance)
Draft75.prototype[key] = instance[key];
module.exports = Draft75;