794 lines
23 KiB
JavaScript
794 lines
23 KiB
JavaScript
/*!
|
|
* ws: a node.js websocket client
|
|
* Copyright(c) 2011 Einar Otto Stangvik <einaros@gmail.com>
|
|
* MIT Licensed
|
|
*/
|
|
|
|
var util = require('util')
|
|
, Validation = require('./Validation').Validation
|
|
, ErrorCodes = require('./ErrorCodes')
|
|
, BufferPool = require('./BufferPool')
|
|
, bufferUtil = require('./BufferUtil').BufferUtil
|
|
, PerMessageDeflate = require('./PerMessageDeflate');
|
|
|
|
/**
|
|
* HyBi Receiver implementation
|
|
*/
|
|
|
|
function Receiver (extensions,maxPayload) {
|
|
if (this instanceof Receiver === false) {
|
|
throw new TypeError("Classes can't be function-called");
|
|
}
|
|
if(typeof extensions==='number'){
|
|
maxPayload=extensions;
|
|
extensions={};
|
|
}
|
|
|
|
|
|
// memory pool for fragmented messages
|
|
var fragmentedPoolPrevUsed = -1;
|
|
this.fragmentedBufferPool = new BufferPool(1024, function(db, length) {
|
|
return db.used + length;
|
|
}, function(db) {
|
|
return fragmentedPoolPrevUsed = fragmentedPoolPrevUsed >= 0 ?
|
|
Math.ceil((fragmentedPoolPrevUsed + db.used) / 2) :
|
|
db.used;
|
|
});
|
|
|
|
// memory pool for unfragmented messages
|
|
var unfragmentedPoolPrevUsed = -1;
|
|
this.unfragmentedBufferPool = new BufferPool(1024, function(db, length) {
|
|
return db.used + length;
|
|
}, function(db) {
|
|
return unfragmentedPoolPrevUsed = unfragmentedPoolPrevUsed >= 0 ?
|
|
Math.ceil((unfragmentedPoolPrevUsed + db.used) / 2) :
|
|
db.used;
|
|
});
|
|
this.extensions = extensions || {};
|
|
this.maxPayload = maxPayload || 0;
|
|
this.currentPayloadLength = 0;
|
|
this.state = {
|
|
activeFragmentedOperation: null,
|
|
lastFragment: false,
|
|
masked: false,
|
|
opcode: 0,
|
|
fragmentedOperation: false
|
|
};
|
|
this.overflow = [];
|
|
this.headerBuffer = new Buffer(10);
|
|
this.expectOffset = 0;
|
|
this.expectBuffer = null;
|
|
this.expectHandler = null;
|
|
this.currentMessage = [];
|
|
this.currentMessageLength = 0;
|
|
this.messageHandlers = [];
|
|
this.expectHeader(2, this.processPacket);
|
|
this.dead = false;
|
|
this.processing = false;
|
|
|
|
this.onerror = function() {};
|
|
this.ontext = function() {};
|
|
this.onbinary = function() {};
|
|
this.onclose = function() {};
|
|
this.onping = function() {};
|
|
this.onpong = function() {};
|
|
}
|
|
|
|
module.exports = Receiver;
|
|
|
|
/**
|
|
* Add new data to the parser.
|
|
*
|
|
* @api public
|
|
*/
|
|
|
|
Receiver.prototype.add = function(data) {
|
|
if (this.dead) return;
|
|
var dataLength = data.length;
|
|
if (dataLength == 0) return;
|
|
if (this.expectBuffer == null) {
|
|
this.overflow.push(data);
|
|
return;
|
|
}
|
|
var toRead = Math.min(dataLength, this.expectBuffer.length - this.expectOffset);
|
|
fastCopy(toRead, data, this.expectBuffer, this.expectOffset);
|
|
this.expectOffset += toRead;
|
|
if (toRead < dataLength) {
|
|
this.overflow.push(data.slice(toRead));
|
|
}
|
|
while (this.expectBuffer && this.expectOffset == this.expectBuffer.length) {
|
|
var bufferForHandler = this.expectBuffer;
|
|
this.expectBuffer = null;
|
|
this.expectOffset = 0;
|
|
this.expectHandler.call(this, bufferForHandler);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Releases all resources used by the receiver.
|
|
*
|
|
* @api public
|
|
*/
|
|
|
|
Receiver.prototype.cleanup = function() {
|
|
this.dead = true;
|
|
this.overflow = null;
|
|
this.headerBuffer = null;
|
|
this.expectBuffer = null;
|
|
this.expectHandler = null;
|
|
this.unfragmentedBufferPool = null;
|
|
this.fragmentedBufferPool = null;
|
|
this.state = null;
|
|
this.currentMessage = null;
|
|
this.onerror = null;
|
|
this.ontext = null;
|
|
this.onbinary = null;
|
|
this.onclose = null;
|
|
this.onping = null;
|
|
this.onpong = null;
|
|
};
|
|
|
|
/**
|
|
* Waits for a certain amount of header bytes to be available, then fires a callback.
|
|
*
|
|
* @api private
|
|
*/
|
|
|
|
Receiver.prototype.expectHeader = function(length, handler) {
|
|
if (length == 0) {
|
|
handler(null);
|
|
return;
|
|
}
|
|
this.expectBuffer = this.headerBuffer.slice(this.expectOffset, this.expectOffset + length);
|
|
this.expectHandler = handler;
|
|
var toRead = length;
|
|
while (toRead > 0 && this.overflow.length > 0) {
|
|
var fromOverflow = this.overflow.pop();
|
|
if (toRead < fromOverflow.length) this.overflow.push(fromOverflow.slice(toRead));
|
|
var read = Math.min(fromOverflow.length, toRead);
|
|
fastCopy(read, fromOverflow, this.expectBuffer, this.expectOffset);
|
|
this.expectOffset += read;
|
|
toRead -= read;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Waits for a certain amount of data bytes to be available, then fires a callback.
|
|
*
|
|
* @api private
|
|
*/
|
|
|
|
Receiver.prototype.expectData = function(length, handler) {
|
|
if (length == 0) {
|
|
handler(null);
|
|
return;
|
|
}
|
|
this.expectBuffer = this.allocateFromPool(length, this.state.fragmentedOperation);
|
|
this.expectHandler = handler;
|
|
var toRead = length;
|
|
while (toRead > 0 && this.overflow.length > 0) {
|
|
var fromOverflow = this.overflow.pop();
|
|
if (toRead < fromOverflow.length) this.overflow.push(fromOverflow.slice(toRead));
|
|
var read = Math.min(fromOverflow.length, toRead);
|
|
fastCopy(read, fromOverflow, this.expectBuffer, this.expectOffset);
|
|
this.expectOffset += read;
|
|
toRead -= read;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Allocates memory from the buffer pool.
|
|
*
|
|
* @api private
|
|
*/
|
|
|
|
Receiver.prototype.allocateFromPool = function(length, isFragmented) {
|
|
return (isFragmented ? this.fragmentedBufferPool : this.unfragmentedBufferPool).get(length);
|
|
};
|
|
|
|
/**
|
|
* Start processing a new packet.
|
|
*
|
|
* @api private
|
|
*/
|
|
|
|
Receiver.prototype.processPacket = function (data) {
|
|
if (this.extensions[PerMessageDeflate.extensionName]) {
|
|
if ((data[0] & 0x30) != 0) {
|
|
this.error('reserved fields (2, 3) must be empty', 1002);
|
|
return;
|
|
}
|
|
} else {
|
|
if ((data[0] & 0x70) != 0) {
|
|
this.error('reserved fields must be empty', 1002);
|
|
return;
|
|
}
|
|
}
|
|
this.state.lastFragment = (data[0] & 0x80) == 0x80;
|
|
this.state.masked = (data[1] & 0x80) == 0x80;
|
|
var compressed = (data[0] & 0x40) == 0x40;
|
|
var opcode = data[0] & 0xf;
|
|
if (opcode === 0) {
|
|
if (compressed) {
|
|
this.error('continuation frame cannot have the Per-message Compressed bits', 1002);
|
|
return;
|
|
}
|
|
// continuation frame
|
|
this.state.fragmentedOperation = true;
|
|
this.state.opcode = this.state.activeFragmentedOperation;
|
|
if (!(this.state.opcode == 1 || this.state.opcode == 2)) {
|
|
this.error('continuation frame cannot follow current opcode', 1002);
|
|
return;
|
|
}
|
|
}
|
|
else {
|
|
if (opcode < 3 && this.state.activeFragmentedOperation != null) {
|
|
this.error('data frames after the initial data frame must have opcode 0', 1002);
|
|
return;
|
|
}
|
|
if (opcode >= 8 && compressed) {
|
|
this.error('control frames cannot have the Per-message Compressed bits', 1002);
|
|
return;
|
|
}
|
|
this.state.compressed = compressed;
|
|
this.state.opcode = opcode;
|
|
if (this.state.lastFragment === false) {
|
|
this.state.fragmentedOperation = true;
|
|
this.state.activeFragmentedOperation = opcode;
|
|
}
|
|
else this.state.fragmentedOperation = false;
|
|
}
|
|
var handler = opcodes[this.state.opcode];
|
|
if (typeof handler == 'undefined') this.error('no handler for opcode ' + this.state.opcode, 1002);
|
|
else {
|
|
handler.start.call(this, data);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Endprocessing a packet.
|
|
*
|
|
* @api private
|
|
*/
|
|
|
|
Receiver.prototype.endPacket = function() {
|
|
if (this.dead) return;
|
|
if (!this.state.fragmentedOperation) this.unfragmentedBufferPool.reset(true);
|
|
else if (this.state.lastFragment) this.fragmentedBufferPool.reset(true);
|
|
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.currentPayloadLength = 0;
|
|
this.state.lastFragment = false;
|
|
this.state.opcode = this.state.activeFragmentedOperation != null ? this.state.activeFragmentedOperation : 0;
|
|
this.state.masked = false;
|
|
this.expectHeader(2, this.processPacket);
|
|
};
|
|
|
|
/**
|
|
* Reset the parser state.
|
|
*
|
|
* @api private
|
|
*/
|
|
|
|
Receiver.prototype.reset = function() {
|
|
if (this.dead) return;
|
|
this.state = {
|
|
activeFragmentedOperation: null,
|
|
lastFragment: false,
|
|
masked: false,
|
|
opcode: 0,
|
|
fragmentedOperation: false
|
|
};
|
|
this.fragmentedBufferPool.reset(true);
|
|
this.unfragmentedBufferPool.reset(true);
|
|
this.expectOffset = 0;
|
|
this.expectBuffer = null;
|
|
this.expectHandler = null;
|
|
this.overflow = [];
|
|
this.currentMessage = [];
|
|
this.currentMessageLength = 0;
|
|
this.messageHandlers = [];
|
|
this.currentPayloadLength = 0;
|
|
};
|
|
|
|
/**
|
|
* Unmask received data.
|
|
*
|
|
* @api private
|
|
*/
|
|
|
|
Receiver.prototype.unmask = function (mask, buf, binary) {
|
|
if (mask != null && buf != null) bufferUtil.unmask(buf, mask);
|
|
if (binary) return buf;
|
|
return buf != null ? buf.toString('utf8') : '';
|
|
};
|
|
|
|
/**
|
|
* Handles an error
|
|
*
|
|
* @api private
|
|
*/
|
|
|
|
Receiver.prototype.error = function (reason, protocolErrorCode) {
|
|
if (this.dead) return;
|
|
this.reset();
|
|
if(typeof reason == 'string'){
|
|
this.onerror(new Error(reason), protocolErrorCode);
|
|
}
|
|
else if(reason.constructor == Error){
|
|
this.onerror(reason, protocolErrorCode);
|
|
}
|
|
else{
|
|
this.onerror(new Error("An error occured"),protocolErrorCode);
|
|
}
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Execute message handler buffers
|
|
*
|
|
* @api private
|
|
*/
|
|
|
|
Receiver.prototype.flush = function() {
|
|
if (this.processing || this.dead) return;
|
|
|
|
var handler = this.messageHandlers.shift();
|
|
if (!handler) return;
|
|
|
|
this.processing = true;
|
|
var self = this;
|
|
|
|
handler(function() {
|
|
self.processing = false;
|
|
self.flush();
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Apply extensions to message
|
|
*
|
|
* @api private
|
|
*/
|
|
|
|
Receiver.prototype.applyExtensions = function(messageBuffer, fin, compressed, callback) {
|
|
var self = this;
|
|
if (compressed) {
|
|
this.extensions[PerMessageDeflate.extensionName].decompress(messageBuffer, fin, function(err, buffer) {
|
|
if (self.dead) return;
|
|
if (err) {
|
|
callback(new Error('invalid compressed data'));
|
|
return;
|
|
}
|
|
callback(null, buffer);
|
|
});
|
|
} else {
|
|
callback(null, messageBuffer);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Checks payload size, disconnects socket when it exceeds maxPayload
|
|
*
|
|
* @api private
|
|
*/
|
|
Receiver.prototype.maxPayloadExceeded = function(length) {
|
|
if (this.maxPayload=== undefined || this.maxPayload === null || this.maxPayload < 1) {
|
|
return false;
|
|
}
|
|
var fullLength = this.currentPayloadLength + length;
|
|
if (fullLength < this.maxPayload) {
|
|
this.currentPayloadLength = fullLength;
|
|
return false;
|
|
}
|
|
this.error('payload cannot exceed ' + this.maxPayload + ' bytes', 1009);
|
|
this.messageBuffer=[];
|
|
this.cleanup();
|
|
|
|
return true;
|
|
};
|
|
|
|
/**
|
|
* Buffer utilities
|
|
*/
|
|
|
|
function readUInt16BE(start) {
|
|
return (this[start]<<8) +
|
|
this[start+1];
|
|
}
|
|
|
|
function readUInt32BE(start) {
|
|
return (this[start]<<24) +
|
|
(this[start+1]<<16) +
|
|
(this[start+2]<<8) +
|
|
this[start+3];
|
|
}
|
|
|
|
function fastCopy(length, srcBuffer, dstBuffer, dstOffset) {
|
|
switch (length) {
|
|
default: srcBuffer.copy(dstBuffer, dstOffset, 0, length); break;
|
|
case 16: dstBuffer[dstOffset+15] = srcBuffer[15];
|
|
case 15: dstBuffer[dstOffset+14] = srcBuffer[14];
|
|
case 14: dstBuffer[dstOffset+13] = srcBuffer[13];
|
|
case 13: dstBuffer[dstOffset+12] = srcBuffer[12];
|
|
case 12: dstBuffer[dstOffset+11] = srcBuffer[11];
|
|
case 11: dstBuffer[dstOffset+10] = srcBuffer[10];
|
|
case 10: dstBuffer[dstOffset+9] = srcBuffer[9];
|
|
case 9: dstBuffer[dstOffset+8] = srcBuffer[8];
|
|
case 8: dstBuffer[dstOffset+7] = srcBuffer[7];
|
|
case 7: dstBuffer[dstOffset+6] = srcBuffer[6];
|
|
case 6: dstBuffer[dstOffset+5] = srcBuffer[5];
|
|
case 5: dstBuffer[dstOffset+4] = srcBuffer[4];
|
|
case 4: dstBuffer[dstOffset+3] = srcBuffer[3];
|
|
case 3: dstBuffer[dstOffset+2] = srcBuffer[2];
|
|
case 2: dstBuffer[dstOffset+1] = srcBuffer[1];
|
|
case 1: dstBuffer[dstOffset] = srcBuffer[0];
|
|
}
|
|
}
|
|
|
|
function clone(obj) {
|
|
var cloned = {};
|
|
for (var k in obj) {
|
|
if (obj.hasOwnProperty(k)) {
|
|
cloned[k] = obj[k];
|
|
}
|
|
}
|
|
return cloned;
|
|
}
|
|
|
|
/**
|
|
* Opcode handlers
|
|
*/
|
|
|
|
var opcodes = {
|
|
// text
|
|
'1': {
|
|
start: function(data) {
|
|
var self = this;
|
|
// decode length
|
|
var firstLength = data[1] & 0x7f;
|
|
if (firstLength < 126) {
|
|
if (self.maxPayloadExceeded(firstLength)){
|
|
self.error('Maximumpayload exceeded in compressed text message. Aborting...', 1009);
|
|
return;
|
|
}
|
|
opcodes['1'].getData.call(self, firstLength);
|
|
}
|
|
else if (firstLength == 126) {
|
|
self.expectHeader(2, function(data) {
|
|
var length = readUInt16BE.call(data, 0);
|
|
if (self.maxPayloadExceeded(length)){
|
|
self.error('Maximumpayload exceeded in compressed text message. Aborting...', 1009);
|
|
return;
|
|
}
|
|
opcodes['1'].getData.call(self, length);
|
|
});
|
|
}
|
|
else if (firstLength == 127) {
|
|
self.expectHeader(8, function(data) {
|
|
if (readUInt32BE.call(data, 0) != 0) {
|
|
self.error('packets with length spanning more than 32 bit is currently not supported', 1008);
|
|
return;
|
|
}
|
|
var length = readUInt32BE.call(data, 4);
|
|
if (self.maxPayloadExceeded(length)){
|
|
self.error('Maximumpayload exceeded in compressed text message. Aborting...', 1009);
|
|
return;
|
|
}
|
|
opcodes['1'].getData.call(self, readUInt32BE.call(data, 4));
|
|
});
|
|
}
|
|
},
|
|
getData: function(length) {
|
|
var self = this;
|
|
if (self.state.masked) {
|
|
self.expectHeader(4, function(data) {
|
|
var mask = data;
|
|
self.expectData(length, function(data) {
|
|
opcodes['1'].finish.call(self, mask, data);
|
|
});
|
|
});
|
|
}
|
|
else {
|
|
self.expectData(length, function(data) {
|
|
opcodes['1'].finish.call(self, null, data);
|
|
});
|
|
}
|
|
},
|
|
finish: function(mask, data) {
|
|
var self = this;
|
|
var packet = this.unmask(mask, data, true) || new Buffer(0);
|
|
var state = clone(this.state);
|
|
this.messageHandlers.push(function(callback) {
|
|
self.applyExtensions(packet, state.lastFragment, state.compressed, function(err, buffer) {
|
|
if (err) {
|
|
if(err.type===1009){
|
|
return self.error('Maximumpayload exceeded in compressed text message. Aborting...', 1009);
|
|
}
|
|
return self.error(err.message, 1007);
|
|
}
|
|
if (buffer != null) {
|
|
if( self.maxPayload==0 || (self.maxPayload > 0 && (self.currentMessageLength + buffer.length) < self.maxPayload) ){
|
|
self.currentMessage.push(buffer);
|
|
}
|
|
else{
|
|
self.currentMessage=null;
|
|
self.currentMessage = [];
|
|
self.currentMessageLength = 0;
|
|
self.error(new Error('Maximum payload exceeded. maxPayload: '+self.maxPayload), 1009);
|
|
return;
|
|
}
|
|
self.currentMessageLength += buffer.length;
|
|
}
|
|
if (state.lastFragment) {
|
|
var messageBuffer = Buffer.concat(self.currentMessage);
|
|
self.currentMessage = [];
|
|
self.currentMessageLength = 0;
|
|
if (!Validation.isValidUTF8(messageBuffer)) {
|
|
self.error('invalid utf8 sequence', 1007);
|
|
return;
|
|
}
|
|
self.ontext(messageBuffer.toString('utf8'), {masked: state.masked, buffer: messageBuffer});
|
|
}
|
|
callback();
|
|
});
|
|
});
|
|
this.flush();
|
|
this.endPacket();
|
|
}
|
|
},
|
|
// binary
|
|
'2': {
|
|
start: function(data) {
|
|
var self = this;
|
|
// decode length
|
|
var firstLength = data[1] & 0x7f;
|
|
if (firstLength < 126) {
|
|
if (self.maxPayloadExceeded(firstLength)){
|
|
self.error('Max payload exceeded in compressed text message. Aborting...', 1009);
|
|
return;
|
|
}
|
|
opcodes['2'].getData.call(self, firstLength);
|
|
}
|
|
else if (firstLength == 126) {
|
|
self.expectHeader(2, function(data) {
|
|
var length = readUInt16BE.call(data, 0);
|
|
if (self.maxPayloadExceeded(length)){
|
|
self.error('Max payload exceeded in compressed text message. Aborting...', 1009);
|
|
return;
|
|
}
|
|
opcodes['2'].getData.call(self, length);
|
|
});
|
|
}
|
|
else if (firstLength == 127) {
|
|
self.expectHeader(8, function(data) {
|
|
if (readUInt32BE.call(data, 0) != 0) {
|
|
self.error('packets with length spanning more than 32 bit is currently not supported', 1008);
|
|
return;
|
|
}
|
|
var length = readUInt32BE.call(data, 4, true);
|
|
if (self.maxPayloadExceeded(length)){
|
|
self.error('Max payload exceeded in compressed text message. Aborting...', 1009);
|
|
return;
|
|
}
|
|
opcodes['2'].getData.call(self, length);
|
|
});
|
|
}
|
|
},
|
|
getData: function(length) {
|
|
var self = this;
|
|
if (self.state.masked) {
|
|
self.expectHeader(4, function(data) {
|
|
var mask = data;
|
|
self.expectData(length, function(data) {
|
|
opcodes['2'].finish.call(self, mask, data);
|
|
});
|
|
});
|
|
}
|
|
else {
|
|
self.expectData(length, function(data) {
|
|
opcodes['2'].finish.call(self, null, data);
|
|
});
|
|
}
|
|
},
|
|
finish: function(mask, data) {
|
|
var self = this;
|
|
var packet = this.unmask(mask, data, true) || new Buffer(0);
|
|
var state = clone(this.state);
|
|
this.messageHandlers.push(function(callback) {
|
|
self.applyExtensions(packet, state.lastFragment, state.compressed, function(err, buffer) {
|
|
if (err) {
|
|
if(err.type===1009){
|
|
return self.error('Max payload exceeded in compressed binary message. Aborting...', 1009);
|
|
}
|
|
return self.error(err.message, 1007);
|
|
}
|
|
if (buffer != null) {
|
|
if( self.maxPayload==0 || (self.maxPayload > 0 && (self.currentMessageLength + buffer.length) < self.maxPayload) ){
|
|
self.currentMessage.push(buffer);
|
|
}
|
|
else{
|
|
self.currentMessage=null;
|
|
self.currentMessage = [];
|
|
self.currentMessageLength = 0;
|
|
self.error(new Error('Maximum payload exceeded'), 1009);
|
|
return;
|
|
}
|
|
self.currentMessageLength += buffer.length;
|
|
}
|
|
if (state.lastFragment) {
|
|
var messageBuffer = Buffer.concat(self.currentMessage);
|
|
self.currentMessage = [];
|
|
self.currentMessageLength = 0;
|
|
self.onbinary(messageBuffer, {masked: state.masked, buffer: messageBuffer});
|
|
}
|
|
callback();
|
|
});
|
|
});
|
|
this.flush();
|
|
this.endPacket();
|
|
}
|
|
},
|
|
// close
|
|
'8': {
|
|
start: function(data) {
|
|
var self = this;
|
|
if (self.state.lastFragment == false) {
|
|
self.error('fragmented close is not supported', 1002);
|
|
return;
|
|
}
|
|
|
|
// decode length
|
|
var firstLength = data[1] & 0x7f;
|
|
if (firstLength < 126) {
|
|
opcodes['8'].getData.call(self, firstLength);
|
|
}
|
|
else {
|
|
self.error('control frames cannot have more than 125 bytes of data', 1002);
|
|
}
|
|
},
|
|
getData: function(length) {
|
|
var self = this;
|
|
if (self.state.masked) {
|
|
self.expectHeader(4, function(data) {
|
|
var mask = data;
|
|
self.expectData(length, function(data) {
|
|
opcodes['8'].finish.call(self, mask, data);
|
|
});
|
|
});
|
|
}
|
|
else {
|
|
self.expectData(length, function(data) {
|
|
opcodes['8'].finish.call(self, null, data);
|
|
});
|
|
}
|
|
},
|
|
finish: function(mask, data) {
|
|
var self = this;
|
|
data = self.unmask(mask, data, true);
|
|
|
|
var state = clone(this.state);
|
|
this.messageHandlers.push(function() {
|
|
if (data && data.length == 1) {
|
|
self.error('close packets with data must be at least two bytes long', 1002);
|
|
return;
|
|
}
|
|
var code = data && data.length > 1 ? readUInt16BE.call(data, 0) : 1000;
|
|
if (!ErrorCodes.isValidErrorCode(code)) {
|
|
self.error('invalid error code', 1002);
|
|
return;
|
|
}
|
|
var message = '';
|
|
if (data && data.length > 2) {
|
|
var messageBuffer = data.slice(2);
|
|
if (!Validation.isValidUTF8(messageBuffer)) {
|
|
self.error('invalid utf8 sequence', 1007);
|
|
return;
|
|
}
|
|
message = messageBuffer.toString('utf8');
|
|
}
|
|
self.onclose(code, message, {masked: state.masked});
|
|
self.reset();
|
|
});
|
|
this.flush();
|
|
},
|
|
},
|
|
// ping
|
|
'9': {
|
|
start: function(data) {
|
|
var self = this;
|
|
if (self.state.lastFragment == false) {
|
|
self.error('fragmented ping is not supported', 1002);
|
|
return;
|
|
}
|
|
|
|
// decode length
|
|
var firstLength = data[1] & 0x7f;
|
|
if (firstLength < 126) {
|
|
opcodes['9'].getData.call(self, firstLength);
|
|
}
|
|
else {
|
|
self.error('control frames cannot have more than 125 bytes of data', 1002);
|
|
}
|
|
},
|
|
getData: function(length) {
|
|
var self = this;
|
|
if (self.state.masked) {
|
|
self.expectHeader(4, function(data) {
|
|
var mask = data;
|
|
self.expectData(length, function(data) {
|
|
opcodes['9'].finish.call(self, mask, data);
|
|
});
|
|
});
|
|
}
|
|
else {
|
|
self.expectData(length, function(data) {
|
|
opcodes['9'].finish.call(self, null, data);
|
|
});
|
|
}
|
|
},
|
|
finish: function(mask, data) {
|
|
var self = this;
|
|
data = this.unmask(mask, data, true);
|
|
var state = clone(this.state);
|
|
this.messageHandlers.push(function(callback) {
|
|
self.onping(data, {masked: state.masked, binary: true});
|
|
callback();
|
|
});
|
|
this.flush();
|
|
this.endPacket();
|
|
}
|
|
},
|
|
// pong
|
|
'10': {
|
|
start: function(data) {
|
|
var self = this;
|
|
if (self.state.lastFragment == false) {
|
|
self.error('fragmented pong is not supported', 1002);
|
|
return;
|
|
}
|
|
|
|
// decode length
|
|
var firstLength = data[1] & 0x7f;
|
|
if (firstLength < 126) {
|
|
opcodes['10'].getData.call(self, firstLength);
|
|
}
|
|
else {
|
|
self.error('control frames cannot have more than 125 bytes of data', 1002);
|
|
}
|
|
},
|
|
getData: function(length) {
|
|
var self = this;
|
|
if (this.state.masked) {
|
|
this.expectHeader(4, function(data) {
|
|
var mask = data;
|
|
self.expectData(length, function(data) {
|
|
opcodes['10'].finish.call(self, mask, data);
|
|
});
|
|
});
|
|
}
|
|
else {
|
|
this.expectData(length, function(data) {
|
|
opcodes['10'].finish.call(self, null, data);
|
|
});
|
|
}
|
|
},
|
|
finish: function(mask, data) {
|
|
var self = this;
|
|
data = self.unmask(mask, data, true);
|
|
var state = clone(this.state);
|
|
this.messageHandlers.push(function(callback) {
|
|
self.onpong(data, {masked: state.masked, binary: true});
|
|
callback();
|
|
});
|
|
this.flush();
|
|
this.endPacket();
|
|
}
|
|
}
|
|
}
|