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