James Coglan
110 lines
2.8 KiB
JavaScript
110 lines
2.8 KiB
JavaScript
var Base = require('./base'),
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Draft75 = require('./draft75'),
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crypto = require('crypto'),
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util = require('util');
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var numberFromKey = function(key) {
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return parseInt(key.match(/[0-9]/g).join(''), 10);
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};
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var spacesInKey = function(key) {
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return key.match(/ /g).length;
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};
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var bigEndian = function(number) {
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var string = '';
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[24, 16, 8, 0].forEach(function(offset) {
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string += String.fromCharCode(number >> offset & 0xFF);
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});
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return string;
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};
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var Draft76 = function(request, url, options) {
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Draft75.apply(this, arguments);
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this._stage = -1;
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this._body = [];
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this.version = 'hixie-76';
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};
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util.inherits(Draft76, Draft75);
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var instance = {
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BODY_SIZE: 8,
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start: function() {
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if (!Draft75.prototype.start.call(this)) return false;
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this._started = true;
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this._sendHandshakeBody();
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return true;
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},
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close: function() {
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if (this.readyState === 3) return false;
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this._write(new Buffer([0xFF, 0x00]));
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this.readyState = 3;
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this.emit('close', new Base.CloseEvent(null, null));
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return true;
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},
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_handshakeResponse: function() {
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return new Buffer('HTTP/1.1 101 WebSocket Protocol Handshake\r\n' +
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'Upgrade: WebSocket\r\n' +
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'Connection: Upgrade\r\n' +
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'Sec-WebSocket-Origin: ' + this._request.headers.origin + '\r\n' +
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'Sec-WebSocket-Location: ' + this.url + '\r\n' +
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this.__headers.toString() +
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'\r\n',
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'binary');
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},
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_handshakeSignature: function() {
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if (this._body.length < this.BODY_SIZE) return null;
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var body = new Buffer(this._body.slice(0, this.BODY_SIZE));
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var headers = this._request.headers,
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key1 = headers['sec-websocket-key1'],
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value1 = numberFromKey(key1) / spacesInKey(key1),
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key2 = headers['sec-websocket-key2'],
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value2 = numberFromKey(key2) / spacesInKey(key2),
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md5 = crypto.createHash('md5');
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md5.update(bigEndian(value1));
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md5.update(bigEndian(value2));
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md5.update(body.toString('binary'));
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return new Buffer(md5.digest('binary'), 'binary');
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},
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_sendHandshakeBody: function() {
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if (!this._started) return;
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var signature = this._handshakeSignature();
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if (!signature) return;
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this._write(signature);
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this._stage = 0;
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this._open();
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if (this._body.length > this.BODY_SIZE)
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this.parse(this._body.slice(this.BODY_SIZE));
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},
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_parseLeadingByte: function(data) {
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if (data !== 0xFF)
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return Draft75.prototype._parseLeadingByte.call(this, data);
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this._closing = true;
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this._length = 0;
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this._stage = 1;
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}
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};
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for (var key in instance)
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Draft76.prototype[key] = instance[key];
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module.exports = Draft76;
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