hackcentercontrol/nodeartnet/node_modules/socket.io/lib/transports/websocket/hybi-16.js

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2012-12-28 22:17:47 +00:00
/*!
* socket.io-node
* Copyright(c) 2011 LearnBoost <dev@learnboost.com>
* MIT Licensed
*/
/**
* Module requirements.
*/
var Transport = require('../../transport')
, EventEmitter = process.EventEmitter
, crypto = require('crypto')
, url = require('url')
, parser = require('../../parser')
, util = require('../../util');
/**
* Export the constructor.
*/
exports = module.exports = WebSocket;
exports.Parser = Parser;
/**
* HTTP interface constructor. Interface compatible with all transports that
* depend on request-response cycles.
*
* @api public
*/
function WebSocket (mng, data, req) {
// parser
var self = this;
this.manager = mng;
this.parser = new Parser();
this.parser.on('data', function (packet) {
self.onMessage(parser.decodePacket(packet));
});
this.parser.on('ping', function () {
// version 8 ping => pong
try {
self.socket.write('\u008a\u0000');
}
catch (e) {
self.end();
return;
}
});
this.parser.on('close', function () {
self.end();
});
this.parser.on('error', function (reason) {
self.log.warn(self.name + ' parser error: ' + reason);
self.end();
});
Transport.call(this, mng, data, req);
};
/**
* Inherits from Transport.
*/
WebSocket.prototype.__proto__ = Transport.prototype;
/**
* Transport name
*
* @api public
*/
WebSocket.prototype.name = 'websocket';
/**
* Websocket draft version
*
* @api public
*/
WebSocket.prototype.protocolVersion = '16';
/**
* Called when the socket connects.
*
* @api private
*/
WebSocket.prototype.onSocketConnect = function () {
var self = this;
if (typeof this.req.headers.upgrade === 'undefined' ||
this.req.headers.upgrade.toLowerCase() !== 'websocket') {
this.log.warn(this.name + ' connection invalid');
this.end();
return;
}
var origin = this.req.headers['origin'] || ''
, location = ((this.manager.settings['match origin protocol'] ?
origin.match(/^https/) : this.socket.encrypted) ?
'wss' : 'ws')
+ '://' + this.req.headers.host + this.req.url;
if (!this.verifyOrigin(origin)) {
this.log.warn(this.name + ' connection invalid: origin mismatch');
this.end();
return;
}
if (!this.req.headers['sec-websocket-key']) {
this.log.warn(this.name + ' connection invalid: received no key');
this.end();
return;
}
// calc key
var key = this.req.headers['sec-websocket-key'];
var shasum = crypto.createHash('sha1');
shasum.update(key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11");
key = shasum.digest('base64');
var headers = [
'HTTP/1.1 101 Switching Protocols'
, 'Upgrade: websocket'
, 'Connection: Upgrade'
, 'Sec-WebSocket-Accept: ' + key
];
try {
this.socket.write(headers.concat('', '').join('\r\n'));
this.socket.setTimeout(0);
this.socket.setNoDelay(true);
} catch (e) {
this.end();
return;
}
this.socket.on('data', function (data) {
self.parser.add(data);
});
};
/**
* Verifies the origin of a request.
*
* @api private
*/
WebSocket.prototype.verifyOrigin = function (origin) {
var origins = this.manager.get('origins');
if (origin === 'null') origin = '*';
if (origins.indexOf('*:*') !== -1) {
return true;
}
if (origin) {
try {
var parts = url.parse(origin);
parts.port = parts.port || 80;
var ok =
~origins.indexOf(parts.hostname + ':' + parts.port) ||
~origins.indexOf(parts.hostname + ':*') ||
~origins.indexOf('*:' + parts.port);
if (!ok) this.log.warn('illegal origin: ' + origin);
return ok;
} catch (ex) {
this.log.warn('error parsing origin');
}
}
else {
this.log.warn('origin missing from websocket call, yet required by config');
}
return false;
};
/**
* Writes to the socket.
*
* @api private
*/
WebSocket.prototype.write = function (data) {
if (this.open) {
var buf = this.frame(0x81, data);
try {
this.socket.write(buf, 'binary');
}
catch (e) {
this.end();
return;
}
this.log.debug(this.name + ' writing', data);
}
};
/**
* Writes a payload.
*
* @api private
*/
WebSocket.prototype.payload = function (msgs) {
for (var i = 0, l = msgs.length; i < l; i++) {
this.write(msgs[i]);
}
return this;
};
/**
* Frame server-to-client output as a text packet.
*
* @api private
*/
WebSocket.prototype.frame = function (opcode, str) {
var dataBuffer = new Buffer(str)
, dataLength = dataBuffer.length
, startOffset = 2
, secondByte = dataLength;
if (dataLength > 65536) {
startOffset = 10;
secondByte = 127;
}
else if (dataLength > 125) {
startOffset = 4;
secondByte = 126;
}
var outputBuffer = new Buffer(dataLength + startOffset);
outputBuffer[0] = opcode;
outputBuffer[1] = secondByte;
dataBuffer.copy(outputBuffer, startOffset);
switch (secondByte) {
case 126:
outputBuffer[2] = dataLength >>> 8;
outputBuffer[3] = dataLength % 256;
break;
case 127:
var l = dataLength;
for (var i = 1; i <= 8; ++i) {
outputBuffer[startOffset - i] = l & 0xff;
l >>>= 8;
}
}
return outputBuffer;
};
/**
* Closes the connection.
*
* @api private
*/
WebSocket.prototype.doClose = function () {
this.socket.end();
};
/**
* WebSocket parser
*
* @api public
*/
function Parser () {
this.state = {
activeFragmentedOperation: null,
lastFragment: false,
masked: false,
opcode: 0
};
this.overflow = null;
this.expectOffset = 0;
this.expectBuffer = null;
this.expectHandler = null;
this.currentMessage = '';
var self = this;
this.opcodeHandlers = {
// text
'1': function(data) {
var finish = function(mask, data) {
self.currentMessage += self.unmask(mask, data);
if (self.state.lastFragment) {
self.emit('data', self.currentMessage);
self.currentMessage = '';
}
self.endPacket();
}
var expectData = function(length) {
if (self.state.masked) {
self.expect('Mask', 4, function(data) {
var mask = data;
self.expect('Data', length, function(data) {
finish(mask, data);
});
});
}
else {
self.expect('Data', length, function(data) {
finish(null, data);
});
}
}
// decode length
var firstLength = data[1] & 0x7f;
if (firstLength < 126) {
expectData(firstLength);
}
else if (firstLength == 126) {
self.expect('Length', 2, function(data) {
expectData(util.unpack(data));
});
}
else if (firstLength == 127) {
self.expect('Length', 8, function(data) {
if (util.unpack(data.slice(0, 4)) != 0) {
self.error('packets with length spanning more than 32 bit is currently not supported');
return;
}
var lengthBytes = data.slice(4); // note: cap to 32 bit length
expectData(util.unpack(data));
});
}
},
// binary
'2': function(data) {
var finish = function(mask, data) {
if (typeof self.currentMessage == 'string') self.currentMessage = []; // build a buffer list
self.currentMessage.push(self.unmask(mask, data, true));
if (self.state.lastFragment) {
self.emit('binary', self.concatBuffers(self.currentMessage));
self.currentMessage = '';
}
self.endPacket();
}
var expectData = function(length) {
if (self.state.masked) {
self.expect('Mask', 4, function(data) {
var mask = data;
self.expect('Data', length, function(data) {
finish(mask, data);
});
});
}
else {
self.expect('Data', length, function(data) {
finish(null, data);
});
}
}
// decode length
var firstLength = data[1] & 0x7f;
if (firstLength < 126) {
expectData(firstLength);
}
else if (firstLength == 126) {
self.expect('Length', 2, function(data) {
expectData(util.unpack(data));
});
}
else if (firstLength == 127) {
self.expect('Length', 8, function(data) {
if (util.unpack(data.slice(0, 4)) != 0) {
self.error('packets with length spanning more than 32 bit is currently not supported');
return;
}
var lengthBytes = data.slice(4); // note: cap to 32 bit length
expectData(util.unpack(data));
});
}
},
// close
'8': function(data) {
self.emit('close');
self.reset();
},
// ping
'9': function(data) {
if (self.state.lastFragment == false) {
self.error('fragmented ping is not supported');
return;
}
var finish = function(mask, data) {
self.emit('ping', self.unmask(mask, data));
self.endPacket();
}
var expectData = function(length) {
if (self.state.masked) {
self.expect('Mask', 4, function(data) {
var mask = data;
self.expect('Data', length, function(data) {
finish(mask, data);
});
});
}
else {
self.expect('Data', length, function(data) {
finish(null, data);
});
}
}
// decode length
var firstLength = data[1] & 0x7f;
if (firstLength == 0) {
finish(null, null);
}
else if (firstLength < 126) {
expectData(firstLength);
}
else if (firstLength == 126) {
self.expect('Length', 2, function(data) {
expectData(util.unpack(data));
});
}
else if (firstLength == 127) {
self.expect('Length', 8, function(data) {
expectData(util.unpack(data));
});
}
}
}
this.expect('Opcode', 2, this.processPacket);
};
/**
* Inherits from EventEmitter.
*/
Parser.prototype.__proto__ = EventEmitter.prototype;
/**
* Add new data to the parser.
*
* @api public
*/
Parser.prototype.add = function(data) {
if (this.expectBuffer == null) {
this.addToOverflow(data);
return;
}
var toRead = Math.min(data.length, this.expectBuffer.length - this.expectOffset);
data.copy(this.expectBuffer, this.expectOffset, 0, toRead);
this.expectOffset += toRead;
if (toRead < data.length) {
// at this point the overflow buffer shouldn't at all exist
this.overflow = new Buffer(data.length - toRead);
data.copy(this.overflow, 0, toRead, toRead + this.overflow.length);
}
if (this.expectOffset == this.expectBuffer.length) {
var bufferForHandler = this.expectBuffer;
this.expectBuffer = null;
this.expectOffset = 0;
this.expectHandler.call(this, bufferForHandler);
}
}
/**
* Adds a piece of data to the overflow.
*
* @api private
*/
Parser.prototype.addToOverflow = function(data) {
if (this.overflow == null) this.overflow = data;
else {
var prevOverflow = this.overflow;
this.overflow = new Buffer(this.overflow.length + data.length);
prevOverflow.copy(this.overflow, 0);
data.copy(this.overflow, prevOverflow.length);
}
}
/**
* Waits for a certain amount of bytes to be available, then fires a callback.
*
* @api private
*/
Parser.prototype.expect = function(what, length, handler) {
this.expectBuffer = new Buffer(length);
this.expectOffset = 0;
this.expectHandler = handler;
if (this.overflow != null) {
var toOverflow = this.overflow;
this.overflow = null;
this.add(toOverflow);
}
}
/**
* Start processing a new packet.
*
* @api private
*/
Parser.prototype.processPacket = function (data) {
if ((data[0] & 0x70) != 0) {
this.error('reserved fields must be empty');
return;
}
this.state.lastFragment = (data[0] & 0x80) == 0x80;
this.state.masked = (data[1] & 0x80) == 0x80;
var opcode = data[0] & 0xf;
if (opcode == 0) {
// continuation frame
this.state.opcode = this.state.activeFragmentedOperation;
if (!(this.state.opcode == 1 || this.state.opcode == 2)) {
this.error('continuation frame cannot follow current opcode')
return;
}
}
else {
this.state.opcode = opcode;
if (this.state.lastFragment === false) {
this.state.activeFragmentedOperation = opcode;
}
}
var handler = this.opcodeHandlers[this.state.opcode];
if (typeof handler == 'undefined') this.error('no handler for opcode ' + this.state.opcode);
else handler(data);
}
/**
* Endprocessing a packet.
*
* @api private
*/
Parser.prototype.endPacket = function() {
this.expectOffset = 0;
this.expectBuffer = null;
this.expectHandler = null;
if (this.state.lastFragment && this.state.opcode == this.state.activeFragmentedOperation) {
// end current fragmented operation
this.state.activeFragmentedOperation = null;
}
this.state.lastFragment = false;
this.state.opcode = this.state.activeFragmentedOperation != null ? this.state.activeFragmentedOperation : 0;
this.state.masked = false;
this.expect('Opcode', 2, this.processPacket);
}
/**
* Reset the parser state.
*
* @api private
*/
Parser.prototype.reset = function() {
this.state = {
activeFragmentedOperation: null,
lastFragment: false,
masked: false,
opcode: 0
};
this.expectOffset = 0;
this.expectBuffer = null;
this.expectHandler = null;
this.overflow = null;
this.currentMessage = '';
}
/**
* Unmask received data.
*
* @api private
*/
Parser.prototype.unmask = function (mask, buf, binary) {
if (mask != null) {
for (var i = 0, ll = buf.length; i < ll; i++) {
buf[i] ^= mask[i % 4];
}
}
if (binary) return buf;
return buf != null ? buf.toString('utf8') : '';
}
/**
* Concatenates a list of buffers.
*
* @api private
*/
Parser.prototype.concatBuffers = function(buffers) {
var length = 0;
for (var i = 0, l = buffers.length; i < l; ++i) {
length += buffers[i].length;
}
var mergedBuffer = new Buffer(length);
var offset = 0;
for (var i = 0, l = buffers.length; i < l; ++i) {
buffers[i].copy(mergedBuffer, offset);
offset += buffers[i].length;
}
return mergedBuffer;
}
/**
* Handles an error
*
* @api private
*/
Parser.prototype.error = function (reason) {
this.reset();
this.emit('error', reason);
return this;
};