You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
124 lines
3.0 KiB
124 lines
3.0 KiB
'use strict';
|
|
|
|
var Buffer = require('safe-buffer').Buffer,
|
|
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 = Buffer.from(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 length = Buffer.byteLength(buffer),
|
|
frame = Buffer.allocUnsafe(length + 2);
|
|
|
|
frame[0] = 0x00;
|
|
frame.write(buffer, 1);
|
|
frame[frame.length - 1] = 0xFF;
|
|
|
|
this._write(frame);
|
|
return true;
|
|
},
|
|
|
|
_handshakeResponse: function() {
|
|
var start = 'HTTP/1.1 101 Web Socket Protocol Handshake',
|
|
headers = [start, this._headers.toString(), ''];
|
|
|
|
return Buffer.from(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;
|