Начало наработок

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# [3.5.0](https://github.com/socketio/engine.io-client/compare/3.4.4...3.5.0) (2020-12-30)
### Bug Fixes
* check the type of the initial packet ([8750356](https://github.com/socketio/engine.io-client/commit/8750356dba5409ba0e1d3a27da6d214118702b3e))
## [3.4.4](https://github.com/socketio/engine.io-client/compare/3.4.3...3.4.4) (2020-09-30)
## [3.4.3](https://github.com/socketio/engine.io-client/compare/3.4.2...3.4.3) (2020-06-04)
### Bug Fixes
* **react-native:** restrict the list of options for the WebSocket object ([e5bc106](https://github.com/socketio/engine.io-client/commit/e5bc1063cc90a7b6262146c7b5338ffff1ff9e5b))
## [3.4.2](https://github.com/socketio/engine.io-client/compare/3.4.1...3.4.2) (2020-05-13)
## [3.4.1](https://github.com/socketio/engine.io-client/compare/3.4.0...3.4.1) (2020-04-17)
### Bug Fixes
* use globalThis polyfill instead of self/global ([357f01d](https://github.com/socketio/engine.io-client/commit/357f01d90448d8565b650377bc7cabb351d991bd))

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(The MIT License)
Copyright (c) 2014-2015 Automattic <dev@cloudup.com>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# Engine.IO client
[![Build Status](https://github.com/socketio/engine.io-client/workflows/CI/badge.svg)](https://github.com/socketio/engine.io-client/actions)
[![NPM version](https://badge.fury.io/js/engine.io-client.svg)](http://badge.fury.io/js/engine.io-client)
This is the client for [Engine.IO](http://github.com/socketio/engine.io),
the implementation of transport-based cross-browser/cross-device
bi-directional communication layer for [Socket.IO](http://github.com/socketio/socket.io).
## How to use
### Standalone
You can find an `engine.io.js` file in this repository, which is a
standalone build you can use as follows:
```html
<script src="/path/to/engine.io.js"></script>
<script>
// eio = Socket
var socket = eio('ws://localhost');
socket.on('open', function(){
socket.on('message', function(data){});
socket.on('close', function(){});
});
</script>
```
### With browserify
Engine.IO is a commonjs module, which means you can include it by using
`require` on the browser and package using [browserify](http://browserify.org/):
1. install the client package
```bash
$ npm install engine.io-client
```
1. write your app code
```js
var socket = require('engine.io-client')('ws://localhost');
socket.on('open', function(){
socket.on('message', function(data){});
socket.on('close', function(){});
});
```
1. build your app bundle
```bash
$ browserify app.js > bundle.js
```
1. include on your page
```html
<script src="/path/to/bundle.js"></script>
```
### Sending and receiving binary
```html
<script src="/path/to/engine.io.js"></script>
<script>
var socket = new eio.Socket('ws://localhost/');
socket.binaryType = 'blob';
socket.on('open', function () {
socket.send(new Int8Array(5));
socket.on('message', function(blob){});
socket.on('close', function(){ });
});
</script>
```
### Node.JS
Add `engine.io-client` to your `package.json` and then:
```js
var socket = require('engine.io-client')('ws://localhost');
socket.on('open', function(){
socket.on('message', function(data){});
socket.on('close', function(){});
});
```
### Node.js with certificates
```js
var opts = {
key: fs.readFileSync('test/fixtures/client.key'),
cert: fs.readFileSync('test/fixtures/client.crt'),
ca: fs.readFileSync('test/fixtures/ca.crt')
};
var socket = require('engine.io-client')('ws://localhost', opts);
socket.on('open', function(){
socket.on('message', function(data){});
socket.on('close', function(){});
});
```
### Node.js with extraHeaders
```js
var opts = {
extraHeaders: {
'X-Custom-Header-For-My-Project': 'my-secret-access-token',
'Cookie': 'user_session=NI2JlCKF90aE0sJZD9ZzujtdsUqNYSBYxzlTsvdSUe35ZzdtVRGqYFr0kdGxbfc5gUOkR9RGp20GVKza; path=/; expires=Tue, 07-Apr-2015 18:18:08 GMT; secure; HttpOnly'
}
};
var socket = require('engine.io-client')('ws://localhost', opts);
socket.on('open', function(){
socket.on('message', function(data){});
socket.on('close', function(){});
});
```
## Features
- Lightweight
- Runs on browser and node.js seamlessly
- Transports are independent of `Engine`
- Easy to debug
- Easy to unit test
- Runs inside HTML5 WebWorker
- Can send and receive binary data
- Receives as ArrayBuffer or Blob when in browser, and Buffer or ArrayBuffer
in Node
- When XHR2 or WebSockets are used, binary is emitted directly. Otherwise
binary is encoded into base64 strings, and decoded when binary types are
supported.
- With browsers that don't support ArrayBuffer, an object { base64: true,
data: dataAsBase64String } is emitted on the `message` event.
## API
### Socket
The client class. Mixes in [Emitter](http://github.com/component/emitter).
Exposed as `eio` in the browser standalone build.
#### Properties
- `protocol` _(Number)_: protocol revision number
- `binaryType` _(String)_ : can be set to 'arraybuffer' or 'blob' in browsers,
and `buffer` or `arraybuffer` in Node. Blob is only used in browser if it's
supported.
#### Events
- `open`
- Fired upon successful connection.
- `message`
- Fired when data is received from the server.
- **Arguments**
- `String` | `ArrayBuffer`: utf-8 encoded data or ArrayBuffer containing
binary data
- `close`
- Fired upon disconnection. In compliance with the WebSocket API spec, this event may be
fired even if the `open` event does not occur (i.e. due to connection error or `close()`).
- `error`
- Fired when an error occurs.
- `flush`
- Fired upon completing a buffer flush
- `drain`
- Fired after `drain` event of transport if writeBuffer is empty
- `upgradeError`
- Fired if an error occurs with a transport we're trying to upgrade to.
- `upgrade`
- Fired upon upgrade success, after the new transport is set
- `ping`
- Fired upon _flushing_ a ping packet (ie: actual packet write out)
- `pong`
- Fired upon receiving a pong packet.
#### Methods
- **constructor**
- Initializes the client
- **Parameters**
- `String` uri
- `Object`: optional, options object
- **Options**
- `agent` (`http.Agent`): `http.Agent` to use, defaults to `false` (NodeJS only)
- `upgrade` (`Boolean`): defaults to true, whether the client should try
to upgrade the transport from long-polling to something better.
- `forceJSONP` (`Boolean`): forces JSONP for polling transport.
- `jsonp` (`Boolean`): determines whether to use JSONP when
necessary for polling. If disabled (by settings to false) an error will
be emitted (saying "No transports available") if no other transports
are available. If another transport is available for opening a
connection (e.g. WebSocket) that transport
will be used instead.
- `forceBase64` (`Boolean`): forces base 64 encoding for polling transport even when XHR2 responseType is available and WebSocket even if the used standard supports binary.
- `enablesXDR` (`Boolean`): enables XDomainRequest for IE8 to avoid loading bar flashing with click sound. default to `false` because XDomainRequest has a flaw of not sending cookie.
- `withCredentials` (`Boolean`): defaults to `true`, whether to include credentials (cookies, authorization headers, TLS client certificates, etc.) with cross-origin XHR polling requests.
- `timestampRequests` (`Boolean`): whether to add the timestamp with each
transport request. Note: polling requests are always stamped unless this
option is explicitly set to `false` (`false`)
- `timestampParam` (`String`): timestamp parameter (`t`)
- `policyPort` (`Number`): port the policy server listens on (`843`)
- `path` (`String`): path to connect to, default is `/engine.io`
- `transports` (`Array`): a list of transports to try (in order).
Defaults to `['polling', 'websocket']`. `Engine`
always attempts to connect directly with the first one, provided the
feature detection test for it passes.
- `transportOptions` (`Object`): hash of options, indexed by transport name, overriding the common options for the given transport
- `rememberUpgrade` (`Boolean`): defaults to false.
If true and if the previous websocket connection to the server succeeded,
the connection attempt will bypass the normal upgrade process and will initially
try websocket. A connection attempt following a transport error will use the
normal upgrade process. It is recommended you turn this on only when using
SSL/TLS connections, or if you know that your network does not block websockets.
- `pfx` (`String`|`Buffer`): Certificate, Private key and CA certificates to use for SSL. Can be used in Node.js client environment to manually specify certificate information.
- `key` (`String`): Private key to use for SSL. Can be used in Node.js client environment to manually specify certificate information.
- `passphrase` (`String`): A string of passphrase for the private key or pfx. Can be used in Node.js client environment to manually specify certificate information.
- `cert` (`String`): Public x509 certificate to use. Can be used in Node.js client environment to manually specify certificate information.
- `ca` (`String`|`Array`): An authority certificate or array of authority certificates to check the remote host against.. Can be used in Node.js client environment to manually specify certificate information.
- `ciphers` (`String`): A string describing the ciphers to use or exclude. Consult the [cipher format list](http://www.openssl.org/docs/apps/ciphers.html#CIPHER_LIST_FORMAT) for details on the format. Can be used in Node.js client environment to manually specify certificate information.
- `rejectUnauthorized` (`Boolean`): If true, the server certificate is verified against the list of supplied CAs. An 'error' event is emitted if verification fails. Verification happens at the connection level, before the HTTP request is sent. Can be used in Node.js client environment to manually specify certificate information.
- `perMessageDeflate` (`Object|Boolean`): parameters of the WebSocket permessage-deflate extension
(see [ws module](https://github.com/einaros/ws) api docs). Set to `false` to disable. (`true`)
- `threshold` (`Number`): data is compressed only if the byte size is above this value. This option is ignored on the browser. (`1024`)
- `extraHeaders` (`Object`): Headers that will be passed for each request to the server (via xhr-polling and via websockets). These values then can be used during handshake or for special proxies. Can only be used in Node.js client environment.
- `onlyBinaryUpgrades` (`Boolean`): whether transport upgrades should be restricted to transports supporting binary data (`false`)
- `forceNode` (`Boolean`): Uses NodeJS implementation for websockets - even if there is a native Browser-Websocket available, which is preferred by default over the NodeJS implementation. (This is useful when using hybrid platforms like nw.js or electron) (`false`, NodeJS only)
- `localAddress` (`String`): the local IP address to connect to
- **Polling-only options**
- `requestTimeout` (`Number`): Timeout for xhr-polling requests in milliseconds (`0`)
- **Websocket-only options**
- `protocols` (`Array`): a list of subprotocols (see [MDN reference](https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API/Writing_WebSocket_servers#Subprotocols))
- `send`
- Sends a message to the server
- **Parameters**
- `String` | `ArrayBuffer` | `ArrayBufferView` | `Blob`: data to send
- `Object`: optional, options object
- `Function`: optional, callback upon `drain`
- **Options**
- `compress` (`Boolean`): whether to compress sending data. This option is ignored and forced to be `true` on the browser. (`true`)
- `close`
- Disconnects the client.
### Transport
The transport class. Private. _Inherits from EventEmitter_.
#### Events
- `poll`: emitted by polling transports upon starting a new request
- `pollComplete`: emitted by polling transports upon completing a request
- `drain`: emitted by polling transports upon a buffer drain
## Tests
`engine.io-client` is used to test
[engine](http://github.com/socketio/engine.io). Running the `engine.io`
test suite ensures the client works and vice-versa.
Browser tests are run using [zuul](https://github.com/defunctzombie/zuul). You can
run the tests locally using the following command.
```
./node_modules/.bin/zuul --local 8080 -- test/index.js
```
Additionally, `engine.io-client` has a standalone test suite you can run
with `make test` which will run node.js and browser tests. You must have zuul setup with
a saucelabs account.
## Support
The support channels for `engine.io-client` are the same as `socket.io`:
- irc.freenode.net **#socket.io**
- [Google Groups](http://groups.google.com/group/socket_io)
- [Website](http://socket.io)
## Development
To contribute patches, run tests or benchmarks, make sure to clone the
repository:
```bash
git clone git://github.com/socketio/engine.io-client.git
```
Then:
```bash
cd engine.io-client
npm install
```
See the `Tests` section above for how to run tests before submitting any patches.
## License
MIT - Copyright (c) 2014 Automattic, Inc.

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module.exports = (function () {
if (typeof self !== 'undefined') {
return self;
} else if (typeof window !== 'undefined') {
return window;
} else {
return Function('return this')(); // eslint-disable-line no-new-func
}
})();

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module.exports = global;

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module.exports = require('./socket');
/**
* Exports parser
*
* @api public
*
*/
module.exports.parser = require('engine.io-parser');

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/**
* Module dependencies.
*/
var transports = require('./transports/index');
var Emitter = require('component-emitter');
var debug = require('debug')('engine.io-client:socket');
var index = require('indexof');
var parser = require('engine.io-parser');
var parseuri = require('parseuri');
var parseqs = require('parseqs');
/**
* Module exports.
*/
module.exports = Socket;
/**
* Socket constructor.
*
* @param {String|Object} uri or options
* @param {Object} options
* @api public
*/
function Socket (uri, opts) {
if (!(this instanceof Socket)) return new Socket(uri, opts);
opts = opts || {};
if (uri && 'object' === typeof uri) {
opts = uri;
uri = null;
}
if (uri) {
uri = parseuri(uri);
opts.hostname = uri.host;
opts.secure = uri.protocol === 'https' || uri.protocol === 'wss';
opts.port = uri.port;
if (uri.query) opts.query = uri.query;
} else if (opts.host) {
opts.hostname = parseuri(opts.host).host;
}
this.secure = null != opts.secure ? opts.secure
: (typeof location !== 'undefined' && 'https:' === location.protocol);
if (opts.hostname && !opts.port) {
// if no port is specified manually, use the protocol default
opts.port = this.secure ? '443' : '80';
}
this.agent = opts.agent || false;
this.hostname = opts.hostname ||
(typeof location !== 'undefined' ? location.hostname : 'localhost');
this.port = opts.port || (typeof location !== 'undefined' && location.port
? location.port
: (this.secure ? 443 : 80));
this.query = opts.query || {};
if ('string' === typeof this.query) this.query = parseqs.decode(this.query);
this.upgrade = false !== opts.upgrade;
this.path = (opts.path || '/engine.io').replace(/\/$/, '') + '/';
this.forceJSONP = !!opts.forceJSONP;
this.jsonp = false !== opts.jsonp;
this.forceBase64 = !!opts.forceBase64;
this.enablesXDR = !!opts.enablesXDR;
this.withCredentials = false !== opts.withCredentials;
this.timestampParam = opts.timestampParam || 't';
this.timestampRequests = opts.timestampRequests;
this.transports = opts.transports || ['polling', 'websocket'];
this.transportOptions = opts.transportOptions || {};
this.readyState = '';
this.writeBuffer = [];
this.prevBufferLen = 0;
this.policyPort = opts.policyPort || 843;
this.rememberUpgrade = opts.rememberUpgrade || false;
this.binaryType = null;
this.onlyBinaryUpgrades = opts.onlyBinaryUpgrades;
this.perMessageDeflate = false !== opts.perMessageDeflate ? (opts.perMessageDeflate || {}) : false;
if (true === this.perMessageDeflate) this.perMessageDeflate = {};
if (this.perMessageDeflate && null == this.perMessageDeflate.threshold) {
this.perMessageDeflate.threshold = 1024;
}
// SSL options for Node.js client
this.pfx = opts.pfx || null;
this.key = opts.key || null;
this.passphrase = opts.passphrase || null;
this.cert = opts.cert || null;
this.ca = opts.ca || null;
this.ciphers = opts.ciphers || null;
this.rejectUnauthorized = opts.rejectUnauthorized === undefined ? true : opts.rejectUnauthorized;
this.forceNode = !!opts.forceNode;
// detect ReactNative environment
this.isReactNative = (typeof navigator !== 'undefined' && typeof navigator.product === 'string' && navigator.product.toLowerCase() === 'reactnative');
// other options for Node.js or ReactNative client
if (typeof self === 'undefined' || this.isReactNative) {
if (opts.extraHeaders && Object.keys(opts.extraHeaders).length > 0) {
this.extraHeaders = opts.extraHeaders;
}
if (opts.localAddress) {
this.localAddress = opts.localAddress;
}
}
// set on handshake
this.id = null;
this.upgrades = null;
this.pingInterval = null;
this.pingTimeout = null;
// set on heartbeat
this.pingIntervalTimer = null;
this.pingTimeoutTimer = null;
this.open();
}
Socket.priorWebsocketSuccess = false;
/**
* Mix in `Emitter`.
*/
Emitter(Socket.prototype);
/**
* Protocol version.
*
* @api public
*/
Socket.protocol = parser.protocol; // this is an int
/**
* Expose deps for legacy compatibility
* and standalone browser access.
*/
Socket.Socket = Socket;
Socket.Transport = require('./transport');
Socket.transports = require('./transports/index');
Socket.parser = require('engine.io-parser');
/**
* Creates transport of the given type.
*
* @param {String} transport name
* @return {Transport}
* @api private
*/
Socket.prototype.createTransport = function (name) {
debug('creating transport "%s"', name);
var query = clone(this.query);
// append engine.io protocol identifier
query.EIO = parser.protocol;
// transport name
query.transport = name;
// per-transport options
var options = this.transportOptions[name] || {};
// session id if we already have one
if (this.id) query.sid = this.id;
var transport = new transports[name]({
query: query,
socket: this,
agent: options.agent || this.agent,
hostname: options.hostname || this.hostname,
port: options.port || this.port,
secure: options.secure || this.secure,
path: options.path || this.path,
forceJSONP: options.forceJSONP || this.forceJSONP,
jsonp: options.jsonp || this.jsonp,
forceBase64: options.forceBase64 || this.forceBase64,
enablesXDR: options.enablesXDR || this.enablesXDR,
withCredentials: options.withCredentials || this.withCredentials,
timestampRequests: options.timestampRequests || this.timestampRequests,
timestampParam: options.timestampParam || this.timestampParam,
policyPort: options.policyPort || this.policyPort,
pfx: options.pfx || this.pfx,
key: options.key || this.key,
passphrase: options.passphrase || this.passphrase,
cert: options.cert || this.cert,
ca: options.ca || this.ca,
ciphers: options.ciphers || this.ciphers,
rejectUnauthorized: options.rejectUnauthorized || this.rejectUnauthorized,
perMessageDeflate: options.perMessageDeflate || this.perMessageDeflate,
extraHeaders: options.extraHeaders || this.extraHeaders,
forceNode: options.forceNode || this.forceNode,
localAddress: options.localAddress || this.localAddress,
requestTimeout: options.requestTimeout || this.requestTimeout,
protocols: options.protocols || void (0),
isReactNative: this.isReactNative
});
return transport;
};
function clone (obj) {
var o = {};
for (var i in obj) {
if (obj.hasOwnProperty(i)) {
o[i] = obj[i];
}
}
return o;
}
/**
* Initializes transport to use and starts probe.
*
* @api private
*/
Socket.prototype.open = function () {
var transport;
if (this.rememberUpgrade && Socket.priorWebsocketSuccess && this.transports.indexOf('websocket') !== -1) {
transport = 'websocket';
} else if (0 === this.transports.length) {
// Emit error on next tick so it can be listened to
var self = this;
setTimeout(function () {
self.emit('error', 'No transports available');
}, 0);
return;
} else {
transport = this.transports[0];
}
this.readyState = 'opening';
// Retry with the next transport if the transport is disabled (jsonp: false)
try {
transport = this.createTransport(transport);
} catch (e) {
this.transports.shift();
this.open();
return;
}
transport.open();
this.setTransport(transport);
};
/**
* Sets the current transport. Disables the existing one (if any).
*
* @api private
*/
Socket.prototype.setTransport = function (transport) {
debug('setting transport %s', transport.name);
var self = this;
if (this.transport) {
debug('clearing existing transport %s', this.transport.name);
this.transport.removeAllListeners();
}
// set up transport
this.transport = transport;
// set up transport listeners
transport
.on('drain', function () {
self.onDrain();
})
.on('packet', function (packet) {
self.onPacket(packet);
})
.on('error', function (e) {
self.onError(e);
})
.on('close', function () {
self.onClose('transport close');
});
};
/**
* Probes a transport.
*
* @param {String} transport name
* @api private
*/
Socket.prototype.probe = function (name) {
debug('probing transport "%s"', name);
var transport = this.createTransport(name, { probe: 1 });
var failed = false;
var self = this;
Socket.priorWebsocketSuccess = false;
function onTransportOpen () {
if (self.onlyBinaryUpgrades) {
var upgradeLosesBinary = !this.supportsBinary && self.transport.supportsBinary;
failed = failed || upgradeLosesBinary;
}
if (failed) return;
debug('probe transport "%s" opened', name);
transport.send([{ type: 'ping', data: 'probe' }]);
transport.once('packet', function (msg) {
if (failed) return;
if ('pong' === msg.type && 'probe' === msg.data) {
debug('probe transport "%s" pong', name);
self.upgrading = true;
self.emit('upgrading', transport);
if (!transport) return;
Socket.priorWebsocketSuccess = 'websocket' === transport.name;
debug('pausing current transport "%s"', self.transport.name);
self.transport.pause(function () {
if (failed) return;
if ('closed' === self.readyState) return;
debug('changing transport and sending upgrade packet');
cleanup();
self.setTransport(transport);
transport.send([{ type: 'upgrade' }]);
self.emit('upgrade', transport);
transport = null;
self.upgrading = false;
self.flush();
});
} else {
debug('probe transport "%s" failed', name);
var err = new Error('probe error');
err.transport = transport.name;
self.emit('upgradeError', err);
}
});
}
function freezeTransport () {
if (failed) return;
// Any callback called by transport should be ignored since now
failed = true;
cleanup();
transport.close();
transport = null;
}
// Handle any error that happens while probing
function onerror (err) {
var error = new Error('probe error: ' + err);
error.transport = transport.name;
freezeTransport();
debug('probe transport "%s" failed because of error: %s', name, err);
self.emit('upgradeError', error);
}
function onTransportClose () {
onerror('transport closed');
}
// When the socket is closed while we're probing
function onclose () {
onerror('socket closed');
}
// When the socket is upgraded while we're probing
function onupgrade (to) {
if (transport && to.name !== transport.name) {
debug('"%s" works - aborting "%s"', to.name, transport.name);
freezeTransport();
}
}
// Remove all listeners on the transport and on self
function cleanup () {
transport.removeListener('open', onTransportOpen);
transport.removeListener('error', onerror);
transport.removeListener('close', onTransportClose);
self.removeListener('close', onclose);
self.removeListener('upgrading', onupgrade);
}
transport.once('open', onTransportOpen);
transport.once('error', onerror);
transport.once('close', onTransportClose);
this.once('close', onclose);
this.once('upgrading', onupgrade);
transport.open();
};
/**
* Called when connection is deemed open.
*
* @api public
*/
Socket.prototype.onOpen = function () {
debug('socket open');
this.readyState = 'open';
Socket.priorWebsocketSuccess = 'websocket' === this.transport.name;
this.emit('open');
this.flush();
// we check for `readyState` in case an `open`
// listener already closed the socket
if ('open' === this.readyState && this.upgrade && this.transport.pause) {
debug('starting upgrade probes');
for (var i = 0, l = this.upgrades.length; i < l; i++) {
this.probe(this.upgrades[i]);
}
}
};
/**
* Handles a packet.
*
* @api private
*/
Socket.prototype.onPacket = function (packet) {
if ('opening' === this.readyState || 'open' === this.readyState ||
'closing' === this.readyState) {
debug('socket receive: type "%s", data "%s"', packet.type, packet.data);
this.emit('packet', packet);
// Socket is live - any packet counts
this.emit('heartbeat');
switch (packet.type) {
case 'open':
this.onHandshake(JSON.parse(packet.data));
break;
case 'pong':
this.setPing();
this.emit('pong');
break;
case 'error':
var err = new Error('server error');
err.code = packet.data;
this.onError(err);
break;
case 'message':
this.emit('data', packet.data);
this.emit('message', packet.data);
break;
}
} else {
debug('packet received with socket readyState "%s"', this.readyState);
}
};
/**
* Called upon handshake completion.
*
* @param {Object} handshake obj
* @api private
*/
Socket.prototype.onHandshake = function (data) {
this.emit('handshake', data);
this.id = data.sid;
this.transport.query.sid = data.sid;
this.upgrades = this.filterUpgrades(data.upgrades);
this.pingInterval = data.pingInterval;
this.pingTimeout = data.pingTimeout;
this.onOpen();
// In case open handler closes socket
if ('closed' === this.readyState) return;
this.setPing();
// Prolong liveness of socket on heartbeat
this.removeListener('heartbeat', this.onHeartbeat);
this.on('heartbeat', this.onHeartbeat);
};
/**
* Resets ping timeout.
*
* @api private
*/
Socket.prototype.onHeartbeat = function (timeout) {
clearTimeout(this.pingTimeoutTimer);
var self = this;
self.pingTimeoutTimer = setTimeout(function () {
if ('closed' === self.readyState) return;
self.onClose('ping timeout');
}, timeout || (self.pingInterval + self.pingTimeout));
};
/**
* Pings server every `this.pingInterval` and expects response
* within `this.pingTimeout` or closes connection.
*
* @api private
*/
Socket.prototype.setPing = function () {
var self = this;
clearTimeout(self.pingIntervalTimer);
self.pingIntervalTimer = setTimeout(function () {
debug('writing ping packet - expecting pong within %sms', self.pingTimeout);
self.ping();
self.onHeartbeat(self.pingTimeout);
}, self.pingInterval);
};
/**
* Sends a ping packet.
*
* @api private
*/
Socket.prototype.ping = function () {
var self = this;
this.sendPacket('ping', function () {
self.emit('ping');
});
};
/**
* Called on `drain` event
*
* @api private
*/
Socket.prototype.onDrain = function () {
this.writeBuffer.splice(0, this.prevBufferLen);
// setting prevBufferLen = 0 is very important
// for example, when upgrading, upgrade packet is sent over,
// and a nonzero prevBufferLen could cause problems on `drain`
this.prevBufferLen = 0;
if (0 === this.writeBuffer.length) {
this.emit('drain');
} else {
this.flush();
}
};
/**
* Flush write buffers.
*
* @api private
*/
Socket.prototype.flush = function () {
if ('closed' !== this.readyState && this.transport.writable &&
!this.upgrading && this.writeBuffer.length) {
debug('flushing %d packets in socket', this.writeBuffer.length);
this.transport.send(this.writeBuffer);
// keep track of current length of writeBuffer
// splice writeBuffer and callbackBuffer on `drain`
this.prevBufferLen = this.writeBuffer.length;
this.emit('flush');
}
};
/**
* Sends a message.
*
* @param {String} message.
* @param {Function} callback function.
* @param {Object} options.
* @return {Socket} for chaining.
* @api public
*/
Socket.prototype.write =
Socket.prototype.send = function (msg, options, fn) {
this.sendPacket('message', msg, options, fn);
return this;
};
/**
* Sends a packet.
*
* @param {String} packet type.
* @param {String} data.
* @param {Object} options.
* @param {Function} callback function.
* @api private
*/
Socket.prototype.sendPacket = function (type, data, options, fn) {
if ('function' === typeof data) {
fn = data;
data = undefined;
}
if ('function' === typeof options) {
fn = options;
options = null;
}
if ('closing' === this.readyState || 'closed' === this.readyState) {
return;
}
options = options || {};
options.compress = false !== options.compress;
var packet = {
type: type,
data: data,
options: options
};
this.emit('packetCreate', packet);
this.writeBuffer.push(packet);
if (fn) this.once('flush', fn);
this.flush();
};
/**
* Closes the connection.
*
* @api private
*/
Socket.prototype.close = function () {
if ('opening' === this.readyState || 'open' === this.readyState) {
this.readyState = 'closing';
var self = this;
if (this.writeBuffer.length) {
this.once('drain', function () {
if (this.upgrading) {
waitForUpgrade();
} else {
close();
}
});
} else if (this.upgrading) {
waitForUpgrade();
} else {
close();
}
}
function close () {
self.onClose('forced close');
debug('socket closing - telling transport to close');
self.transport.close();
}
function cleanupAndClose () {
self.removeListener('upgrade', cleanupAndClose);
self.removeListener('upgradeError', cleanupAndClose);
close();
}
function waitForUpgrade () {
// wait for upgrade to finish since we can't send packets while pausing a transport
self.once('upgrade', cleanupAndClose);
self.once('upgradeError', cleanupAndClose);
}
return this;
};
/**
* Called upon transport error
*
* @api private
*/
Socket.prototype.onError = function (err) {
debug('socket error %j', err);
Socket.priorWebsocketSuccess = false;
this.emit('error', err);
this.onClose('transport error', err);
};
/**
* Called upon transport close.
*
* @api private
*/
Socket.prototype.onClose = function (reason, desc) {
if ('opening' === this.readyState || 'open' === this.readyState || 'closing' === this.readyState) {
debug('socket close with reason: "%s"', reason);
var self = this;
// clear timers
clearTimeout(this.pingIntervalTimer);
clearTimeout(this.pingTimeoutTimer);
// stop event from firing again for transport
this.transport.removeAllListeners('close');
// ensure transport won't stay open
this.transport.close();
// ignore further transport communication
this.transport.removeAllListeners();
// set ready state
this.readyState = 'closed';
// clear session id
this.id = null;
// emit close event
this.emit('close', reason, desc);
// clean buffers after, so users can still
// grab the buffers on `close` event
self.writeBuffer = [];
self.prevBufferLen = 0;
}
};
/**
* Filters upgrades, returning only those matching client transports.
*
* @param {Array} server upgrades
* @api private
*
*/
Socket.prototype.filterUpgrades = function (upgrades) {
var filteredUpgrades = [];
for (var i = 0, j = upgrades.length; i < j; i++) {
if (~index(this.transports, upgrades[i])) filteredUpgrades.push(upgrades[i]);
}
return filteredUpgrades;
};

161
node_modules/engine.io-client/lib/transport.js generated vendored Normal file
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/**
* Module dependencies.
*/
var parser = require('engine.io-parser');
var Emitter = require('component-emitter');
/**
* Module exports.
*/
module.exports = Transport;
/**
* Transport abstract constructor.
*
* @param {Object} options.
* @api private
*/
function Transport (opts) {
this.path = opts.path;
this.hostname = opts.hostname;
this.port = opts.port;
this.secure = opts.secure;
this.query = opts.query;
this.timestampParam = opts.timestampParam;
this.timestampRequests = opts.timestampRequests;
this.readyState = '';
this.agent = opts.agent || false;
this.socket = opts.socket;
this.enablesXDR = opts.enablesXDR;
this.withCredentials = opts.withCredentials;
// SSL options for Node.js client
this.pfx = opts.pfx;
this.key = opts.key;
this.passphrase = opts.passphrase;
this.cert = opts.cert;
this.ca = opts.ca;
this.ciphers = opts.ciphers;
this.rejectUnauthorized = opts.rejectUnauthorized;
this.forceNode = opts.forceNode;
// results of ReactNative environment detection
this.isReactNative = opts.isReactNative;
// other options for Node.js client
this.extraHeaders = opts.extraHeaders;
this.localAddress = opts.localAddress;
}
/**
* Mix in `Emitter`.
*/
Emitter(Transport.prototype);
/**
* Emits an error.
*
* @param {String} str
* @return {Transport} for chaining
* @api public
*/
Transport.prototype.onError = function (msg, desc) {
var err = new Error(msg);
err.type = 'TransportError';
err.description = desc;
this.emit('error', err);
return this;
};
/**
* Opens the transport.
*
* @api public
*/
Transport.prototype.open = function () {
if ('closed' === this.readyState || '' === this.readyState) {
this.readyState = 'opening';
this.doOpen();
}
return this;
};
/**
* Closes the transport.
*
* @api private
*/
Transport.prototype.close = function () {
if ('opening' === this.readyState || 'open' === this.readyState) {
this.doClose();
this.onClose();
}
return this;
};
/**
* Sends multiple packets.
*
* @param {Array} packets
* @api private
*/
Transport.prototype.send = function (packets) {
if ('open' === this.readyState) {
this.write(packets);
} else {
throw new Error('Transport not open');
}
};
/**
* Called upon open
*
* @api private
*/
Transport.prototype.onOpen = function () {
this.readyState = 'open';
this.writable = true;
this.emit('open');
};
/**
* Called with data.
*
* @param {String} data
* @api private
*/
Transport.prototype.onData = function (data) {
var packet = parser.decodePacket(data, this.socket.binaryType);
this.onPacket(packet);
};
/**
* Called with a decoded packet.
*/
Transport.prototype.onPacket = function (packet) {
this.emit('packet', packet);
};
/**
* Called upon close.
*
* @api private
*/
Transport.prototype.onClose = function () {
this.readyState = 'closed';
this.emit('close');
};

53
node_modules/engine.io-client/lib/transports/index.js generated vendored Executable file
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/**
* Module dependencies
*/
var XMLHttpRequest = require('xmlhttprequest-ssl');
var XHR = require('./polling-xhr');
var JSONP = require('./polling-jsonp');
var websocket = require('./websocket');
/**
* Export transports.
*/
exports.polling = polling;
exports.websocket = websocket;
/**
* Polling transport polymorphic constructor.
* Decides on xhr vs jsonp based on feature detection.
*
* @api private
*/
function polling (opts) {
var xhr;
var xd = false;
var xs = false;
var jsonp = false !== opts.jsonp;
if (typeof location !== 'undefined') {
var isSSL = 'https:' === location.protocol;
var port = location.port;
// some user agents have empty `location.port`
if (!port) {
port = isSSL ? 443 : 80;
}
xd = opts.hostname !== location.hostname || port !== opts.port;
xs = opts.secure !== isSSL;
}
opts.xdomain = xd;
opts.xscheme = xs;
xhr = new XMLHttpRequest(opts);
if ('open' in xhr && !opts.forceJSONP) {
return new XHR(opts);
} else {
if (!jsonp) throw new Error('JSONP disabled');
return new JSONP(opts);
}
}

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/**
* Module requirements.
*/
var Polling = require('./polling');
var inherit = require('component-inherit');
var globalThis = require('../globalThis');
/**
* Module exports.
*/
module.exports = JSONPPolling;
/**
* Cached regular expressions.
*/
var rNewline = /\n/g;
var rEscapedNewline = /\\n/g;
/**
* Global JSONP callbacks.
*/
var callbacks;
/**
* Noop.
*/
function empty () { }
/**
* JSONP Polling constructor.
*
* @param {Object} opts.
* @api public
*/
function JSONPPolling (opts) {
Polling.call(this, opts);
this.query = this.query || {};
// define global callbacks array if not present
// we do this here (lazily) to avoid unneeded global pollution
if (!callbacks) {
// we need to consider multiple engines in the same page
callbacks = globalThis.___eio = (globalThis.___eio || []);
}
// callback identifier
this.index = callbacks.length;
// add callback to jsonp global
var self = this;
callbacks.push(function (msg) {
self.onData(msg);
});
// append to query string
this.query.j = this.index;
// prevent spurious errors from being emitted when the window is unloaded
if (typeof addEventListener === 'function') {
addEventListener('beforeunload', function () {
if (self.script) self.script.onerror = empty;
}, false);
}
}
/**
* Inherits from Polling.
*/
inherit(JSONPPolling, Polling);
/*
* JSONP only supports binary as base64 encoded strings
*/
JSONPPolling.prototype.supportsBinary = false;
/**
* Closes the socket.
*
* @api private
*/
JSONPPolling.prototype.doClose = function () {
if (this.script) {
this.script.parentNode.removeChild(this.script);
this.script = null;
}
if (this.form) {
this.form.parentNode.removeChild(this.form);
this.form = null;
this.iframe = null;
}
Polling.prototype.doClose.call(this);
};
/**
* Starts a poll cycle.
*
* @api private
*/
JSONPPolling.prototype.doPoll = function () {
var self = this;
var script = document.createElement('script');
if (this.script) {
this.script.parentNode.removeChild(this.script);
this.script = null;
}
script.async = true;
script.src = this.uri();
script.onerror = function (e) {
self.onError('jsonp poll error', e);
};
var insertAt = document.getElementsByTagName('script')[0];
if (insertAt) {
insertAt.parentNode.insertBefore(script, insertAt);
} else {
(document.head || document.body).appendChild(script);
}
this.script = script;
var isUAgecko = 'undefined' !== typeof navigator && /gecko/i.test(navigator.userAgent);
if (isUAgecko) {
setTimeout(function () {
var iframe = document.createElement('iframe');
document.body.appendChild(iframe);
document.body.removeChild(iframe);
}, 100);
}
};
/**
* Writes with a hidden iframe.
*
* @param {String} data to send
* @param {Function} called upon flush.
* @api private
*/
JSONPPolling.prototype.doWrite = function (data, fn) {
var self = this;
if (!this.form) {
var form = document.createElement('form');
var area = document.createElement('textarea');
var id = this.iframeId = 'eio_iframe_' + this.index;
var iframe;
form.className = 'socketio';
form.style.position = 'absolute';
form.style.top = '-1000px';
form.style.left = '-1000px';
form.target = id;
form.method = 'POST';
form.setAttribute('accept-charset', 'utf-8');
area.name = 'd';
form.appendChild(area);
document.body.appendChild(form);
this.form = form;
this.area = area;
}
this.form.action = this.uri();
function complete () {
initIframe();
fn();
}
function initIframe () {
if (self.iframe) {
try {
self.form.removeChild(self.iframe);
} catch (e) {
self.onError('jsonp polling iframe removal error', e);
}
}
try {
// ie6 dynamic iframes with target="" support (thanks Chris Lambacher)
var html = '<iframe src="javascript:0" name="' + self.iframeId + '">';
iframe = document.createElement(html);
} catch (e) {
iframe = document.createElement('iframe');
iframe.name = self.iframeId;
iframe.src = 'javascript:0';
}
iframe.id = self.iframeId;
self.form.appendChild(iframe);
self.iframe = iframe;
}
initIframe();
// escape \n to prevent it from being converted into \r\n by some UAs
// double escaping is required for escaped new lines because unescaping of new lines can be done safely on server-side
data = data.replace(rEscapedNewline, '\\\n');
this.area.value = data.replace(rNewline, '\\n');
try {
this.form.submit();
} catch (e) {}
if (this.iframe.attachEvent) {
this.iframe.onreadystatechange = function () {
if (self.iframe.readyState === 'complete') {
complete();
}
};
} else {
this.iframe.onload = complete;
}
};

418
node_modules/engine.io-client/lib/transports/polling-xhr.js generated vendored Executable file
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/* global attachEvent */
/**
* Module requirements.
*/
var XMLHttpRequest = require('xmlhttprequest-ssl');
var Polling = require('./polling');
var Emitter = require('component-emitter');
var inherit = require('component-inherit');
var debug = require('debug')('engine.io-client:polling-xhr');
var globalThis = require('../globalThis');
/**
* Module exports.
*/
module.exports = XHR;
module.exports.Request = Request;
/**
* Empty function
*/
function empty () {}
/**
* XHR Polling constructor.
*
* @param {Object} opts
* @api public
*/
function XHR (opts) {
Polling.call(this, opts);
this.requestTimeout = opts.requestTimeout;
this.extraHeaders = opts.extraHeaders;
if (typeof location !== 'undefined') {
var isSSL = 'https:' === location.protocol;
var port = location.port;
// some user agents have empty `location.port`
if (!port) {
port = isSSL ? 443 : 80;
}
this.xd = (typeof location !== 'undefined' && opts.hostname !== location.hostname) ||
port !== opts.port;
this.xs = opts.secure !== isSSL;
}
}
/**
* Inherits from Polling.
*/
inherit(XHR, Polling);
/**
* XHR supports binary
*/
XHR.prototype.supportsBinary = true;
/**
* Creates a request.
*
* @param {String} method
* @api private
*/
XHR.prototype.request = function (opts) {
opts = opts || {};
opts.uri = this.uri();
opts.xd = this.xd;
opts.xs = this.xs;
opts.agent = this.agent || false;
opts.supportsBinary = this.supportsBinary;
opts.enablesXDR = this.enablesXDR;
opts.withCredentials = this.withCredentials;
// SSL options for Node.js client
opts.pfx = this.pfx;
opts.key = this.key;
opts.passphrase = this.passphrase;
opts.cert = this.cert;
opts.ca = this.ca;
opts.ciphers = this.ciphers;
opts.rejectUnauthorized = this.rejectUnauthorized;
opts.requestTimeout = this.requestTimeout;
// other options for Node.js client
opts.extraHeaders = this.extraHeaders;
return new Request(opts);
};
/**
* Sends data.
*
* @param {String} data to send.
* @param {Function} called upon flush.
* @api private
*/
XHR.prototype.doWrite = function (data, fn) {
var isBinary = typeof data !== 'string' && data !== undefined;
var req = this.request({ method: 'POST', data: data, isBinary: isBinary });
var self = this;
req.on('success', fn);
req.on('error', function (err) {
self.onError('xhr post error', err);
});
this.sendXhr = req;
};
/**
* Starts a poll cycle.
*
* @api private
*/
XHR.prototype.doPoll = function () {
debug('xhr poll');
var req = this.request();
var self = this;
req.on('data', function (data) {
self.onData(data);
});
req.on('error', function (err) {
self.onError('xhr poll error', err);
});
this.pollXhr = req;
};
/**
* Request constructor
*
* @param {Object} options
* @api public
*/
function Request (opts) {
this.method = opts.method || 'GET';
this.uri = opts.uri;
this.xd = !!opts.xd;
this.xs = !!opts.xs;
this.async = false !== opts.async;
this.data = undefined !== opts.data ? opts.data : null;
this.agent = opts.agent;
this.isBinary = opts.isBinary;
this.supportsBinary = opts.supportsBinary;
this.enablesXDR = opts.enablesXDR;
this.withCredentials = opts.withCredentials;
this.requestTimeout = opts.requestTimeout;
// SSL options for Node.js client
this.pfx = opts.pfx;
this.key = opts.key;
this.passphrase = opts.passphrase;
this.cert = opts.cert;
this.ca = opts.ca;
this.ciphers = opts.ciphers;
this.rejectUnauthorized = opts.rejectUnauthorized;
// other options for Node.js client
this.extraHeaders = opts.extraHeaders;
this.create();
}
/**
* Mix in `Emitter`.
*/
Emitter(Request.prototype);
/**
* Creates the XHR object and sends the request.
*
* @api private
*/
Request.prototype.create = function () {
var opts = { agent: this.agent, xdomain: this.xd, xscheme: this.xs, enablesXDR: this.enablesXDR };
// SSL options for Node.js client
opts.pfx = this.pfx;
opts.key = this.key;
opts.passphrase = this.passphrase;
opts.cert = this.cert;
opts.ca = this.ca;
opts.ciphers = this.ciphers;
opts.rejectUnauthorized = this.rejectUnauthorized;
var xhr = this.xhr = new XMLHttpRequest(opts);
var self = this;
try {
debug('xhr open %s: %s', this.method, this.uri);
xhr.open(this.method, this.uri, this.async);
try {
if (this.extraHeaders) {
xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);
for (var i in this.extraHeaders) {
if (this.extraHeaders.hasOwnProperty(i)) {
xhr.setRequestHeader(i, this.extraHeaders[i]);
}
}
}
} catch (e) {}
if ('POST' === this.method) {
try {
if (this.isBinary) {
xhr.setRequestHeader('Content-type', 'application/octet-stream');
} else {
xhr.setRequestHeader('Content-type', 'text/plain;charset=UTF-8');
}
} catch (e) {}
}
try {
xhr.setRequestHeader('Accept', '*/*');
} catch (e) {}
// ie6 check
if ('withCredentials' in xhr) {
xhr.withCredentials = this.withCredentials;
}
if (this.requestTimeout) {
xhr.timeout = this.requestTimeout;
}
if (this.hasXDR()) {
xhr.onload = function () {
self.onLoad();
};
xhr.onerror = function () {
self.onError(xhr.responseText);
};
} else {
xhr.onreadystatechange = function () {
if (xhr.readyState === 2) {
try {
var contentType = xhr.getResponseHeader('Content-Type');
if (self.supportsBinary && contentType === 'application/octet-stream' || contentType === 'application/octet-stream; charset=UTF-8') {
xhr.responseType = 'arraybuffer';
}
} catch (e) {}
}
if (4 !== xhr.readyState) return;
if (200 === xhr.status || 1223 === xhr.status) {
self.onLoad();
} else {
// make sure the `error` event handler that's user-set
// does not throw in the same tick and gets caught here
setTimeout(function () {
self.onError(typeof xhr.status === 'number' ? xhr.status : 0);
}, 0);
}
};
}
debug('xhr data %s', this.data);
xhr.send(this.data);
} catch (e) {
// Need to defer since .create() is called directly fhrom the constructor
// and thus the 'error' event can only be only bound *after* this exception
// occurs. Therefore, also, we cannot throw here at all.
setTimeout(function () {
self.onError(e);
}, 0);
return;
}
if (typeof document !== 'undefined') {
this.index = Request.requestsCount++;
Request.requests[this.index] = this;
}
};
/**
* Called upon successful response.
*
* @api private
*/
Request.prototype.onSuccess = function () {
this.emit('success');
this.cleanup();
};
/**
* Called if we have data.
*
* @api private
*/
Request.prototype.onData = function (data) {
this.emit('data', data);
this.onSuccess();
};
/**
* Called upon error.
*
* @api private
*/
Request.prototype.onError = function (err) {
this.emit('error', err);
this.cleanup(true);
};
/**
* Cleans up house.
*
* @api private
*/
Request.prototype.cleanup = function (fromError) {
if ('undefined' === typeof this.xhr || null === this.xhr) {
return;
}
// xmlhttprequest
if (this.hasXDR()) {
this.xhr.onload = this.xhr.onerror = empty;
} else {
this.xhr.onreadystatechange = empty;
}
if (fromError) {
try {
this.xhr.abort();
} catch (e) {}
}
if (typeof document !== 'undefined') {
delete Request.requests[this.index];
}
this.xhr = null;
};
/**
* Called upon load.
*
* @api private
*/
Request.prototype.onLoad = function () {
var data;
try {
var contentType;
try {
contentType = this.xhr.getResponseHeader('Content-Type');
} catch (e) {}
if (contentType === 'application/octet-stream' || contentType === 'application/octet-stream; charset=UTF-8') {
data = this.xhr.response || this.xhr.responseText;
} else {
data = this.xhr.responseText;
}
} catch (e) {
this.onError(e);
}
if (null != data) {
this.onData(data);
}
};
/**
* Check if it has XDomainRequest.
*
* @api private
*/
Request.prototype.hasXDR = function () {
return typeof XDomainRequest !== 'undefined' && !this.xs && this.enablesXDR;
};
/**
* Aborts the request.
*
* @api public
*/
Request.prototype.abort = function () {
this.cleanup();
};
/**
* Aborts pending requests when unloading the window. This is needed to prevent
* memory leaks (e.g. when using IE) and to ensure that no spurious error is
* emitted.
*/
Request.requestsCount = 0;
Request.requests = {};
if (typeof document !== 'undefined') {
if (typeof attachEvent === 'function') {
attachEvent('onunload', unloadHandler);
} else if (typeof addEventListener === 'function') {
var terminationEvent = 'onpagehide' in globalThis ? 'pagehide' : 'unload';
addEventListener(terminationEvent, unloadHandler, false);
}
}
function unloadHandler () {
for (var i in Request.requests) {
if (Request.requests.hasOwnProperty(i)) {
Request.requests[i].abort();
}
}
}

245
node_modules/engine.io-client/lib/transports/polling.js generated vendored Normal file
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/**
* Module dependencies.
*/
var Transport = require('../transport');
var parseqs = require('parseqs');
var parser = require('engine.io-parser');
var inherit = require('component-inherit');
var yeast = require('yeast');
var debug = require('debug')('engine.io-client:polling');
/**
* Module exports.
*/
module.exports = Polling;
/**
* Is XHR2 supported?
*/
var hasXHR2 = (function () {
var XMLHttpRequest = require('xmlhttprequest-ssl');
var xhr = new XMLHttpRequest({ xdomain: false });
return null != xhr.responseType;
})();
/**
* Polling interface.
*
* @param {Object} opts
* @api private
*/
function Polling (opts) {
var forceBase64 = (opts && opts.forceBase64);
if (!hasXHR2 || forceBase64) {
this.supportsBinary = false;
}
Transport.call(this, opts);
}
/**
* Inherits from Transport.
*/
inherit(Polling, Transport);
/**
* Transport name.
*/
Polling.prototype.name = 'polling';
/**
* Opens the socket (triggers polling). We write a PING message to determine
* when the transport is open.
*
* @api private
*/
Polling.prototype.doOpen = function () {
this.poll();
};
/**
* Pauses polling.
*
* @param {Function} callback upon buffers are flushed and transport is paused
* @api private
*/
Polling.prototype.pause = function (onPause) {
var self = this;
this.readyState = 'pausing';
function pause () {
debug('paused');
self.readyState = 'paused';
onPause();
}
if (this.polling || !this.writable) {
var total = 0;
if (this.polling) {
debug('we are currently polling - waiting to pause');
total++;
this.once('pollComplete', function () {
debug('pre-pause polling complete');
--total || pause();
});
}
if (!this.writable) {
debug('we are currently writing - waiting to pause');
total++;
this.once('drain', function () {
debug('pre-pause writing complete');
--total || pause();
});
}
} else {
pause();
}
};
/**
* Starts polling cycle.
*
* @api public
*/
Polling.prototype.poll = function () {
debug('polling');
this.polling = true;
this.doPoll();
this.emit('poll');
};
/**
* Overloads onData to detect payloads.
*
* @api private
*/
Polling.prototype.onData = function (data) {
var self = this;
debug('polling got data %s', data);
var callback = function (packet, index, total) {
// if its the first message we consider the transport open
if ('opening' === self.readyState && packet.type === 'open') {
self.onOpen();
}
// if its a close packet, we close the ongoing requests
if ('close' === packet.type) {
self.onClose();
return false;
}
// otherwise bypass onData and handle the message
self.onPacket(packet);
};
// decode payload
parser.decodePayload(data, this.socket.binaryType, callback);
// if an event did not trigger closing
if ('closed' !== this.readyState) {
// if we got data we're not polling
this.polling = false;
this.emit('pollComplete');
if ('open' === this.readyState) {
this.poll();
} else {
debug('ignoring poll - transport state "%s"', this.readyState);
}
}
};
/**
* For polling, send a close packet.
*
* @api private
*/
Polling.prototype.doClose = function () {
var self = this;
function close () {
debug('writing close packet');
self.write([{ type: 'close' }]);
}
if ('open' === this.readyState) {
debug('transport open - closing');
close();
} else {
// in case we're trying to close while
// handshaking is in progress (GH-164)
debug('transport not open - deferring close');
this.once('open', close);
}
};
/**
* Writes a packets payload.
*
* @param {Array} data packets
* @param {Function} drain callback
* @api private
*/
Polling.prototype.write = function (packets) {
var self = this;
this.writable = false;
var callbackfn = function () {
self.writable = true;
self.emit('drain');
};
parser.encodePayload(packets, this.supportsBinary, function (data) {
self.doWrite(data, callbackfn);
});
};
/**
* Generates uri for connection.
*
* @api private
*/
Polling.prototype.uri = function () {
var query = this.query || {};
var schema = this.secure ? 'https' : 'http';
var port = '';
// cache busting is forced
if (false !== this.timestampRequests) {
query[this.timestampParam] = yeast();
}
if (!this.supportsBinary && !query.sid) {
query.b64 = 1;
}
query = parseqs.encode(query);
// avoid port if default for schema
if (this.port && (('https' === schema && Number(this.port) !== 443) ||
('http' === schema && Number(this.port) !== 80))) {
port = ':' + this.port;
}
// prepend ? to query
if (query.length) {
query = '?' + query;
}
var ipv6 = this.hostname.indexOf(':') !== -1;
return schema + '://' + (ipv6 ? '[' + this.hostname + ']' : this.hostname) + port + this.path + query;
};

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/**
* Module dependencies.
*/
var Transport = require('../transport');
var parser = require('engine.io-parser');
var parseqs = require('parseqs');
var inherit = require('component-inherit');
var yeast = require('yeast');
var debug = require('debug')('engine.io-client:websocket');
var BrowserWebSocket, NodeWebSocket;
if (typeof WebSocket !== 'undefined') {
BrowserWebSocket = WebSocket;
} else if (typeof self !== 'undefined') {
BrowserWebSocket = self.WebSocket || self.MozWebSocket;
}
if (typeof window === 'undefined') {
try {
NodeWebSocket = require('ws');
} catch (e) { }
}
/**
* Get either the `WebSocket` or `MozWebSocket` globals
* in the browser or try to resolve WebSocket-compatible
* interface exposed by `ws` for Node-like environment.
*/
var WebSocketImpl = BrowserWebSocket || NodeWebSocket;
/**
* Module exports.
*/
module.exports = WS;
/**
* WebSocket transport constructor.
*
* @api {Object} connection options
* @api public
*/
function WS (opts) {
var forceBase64 = (opts && opts.forceBase64);
if (forceBase64) {
this.supportsBinary = false;
}
this.perMessageDeflate = opts.perMessageDeflate;
this.usingBrowserWebSocket = BrowserWebSocket && !opts.forceNode;
this.protocols = opts.protocols;
if (!this.usingBrowserWebSocket) {
WebSocketImpl = NodeWebSocket;
}
Transport.call(this, opts);
}
/**
* Inherits from Transport.
*/
inherit(WS, Transport);
/**
* Transport name.
*
* @api public
*/
WS.prototype.name = 'websocket';
/*
* WebSockets support binary
*/
WS.prototype.supportsBinary = true;
/**
* Opens socket.
*
* @api private
*/
WS.prototype.doOpen = function () {
if (!this.check()) {
// let probe timeout
return;
}
var uri = this.uri();
var protocols = this.protocols;
var opts = {};
if (!this.isReactNative) {
opts.agent = this.agent;
opts.perMessageDeflate = this.perMessageDeflate;
// SSL options for Node.js client
opts.pfx = this.pfx;
opts.key = this.key;
opts.passphrase = this.passphrase;
opts.cert = this.cert;
opts.ca = this.ca;
opts.ciphers = this.ciphers;
opts.rejectUnauthorized = this.rejectUnauthorized;
}
if (this.extraHeaders) {
opts.headers = this.extraHeaders;
}
if (this.localAddress) {
opts.localAddress = this.localAddress;
}
try {
this.ws =
this.usingBrowserWebSocket && !this.isReactNative
? protocols
? new WebSocketImpl(uri, protocols)
: new WebSocketImpl(uri)
: new WebSocketImpl(uri, protocols, opts);
} catch (err) {
return this.emit('error', err);
}
if (this.ws.binaryType === undefined) {
this.supportsBinary = false;
}
if (this.ws.supports && this.ws.supports.binary) {
this.supportsBinary = true;
this.ws.binaryType = 'nodebuffer';
} else {
this.ws.binaryType = 'arraybuffer';
}
this.addEventListeners();
};
/**
* Adds event listeners to the socket
*
* @api private
*/
WS.prototype.addEventListeners = function () {
var self = this;
this.ws.onopen = function () {
self.onOpen();
};
this.ws.onclose = function () {
self.onClose();
};
this.ws.onmessage = function (ev) {
self.onData(ev.data);
};
this.ws.onerror = function (e) {
self.onError('websocket error', e);
};
};
/**
* Writes data to socket.
*
* @param {Array} array of packets.
* @api private
*/
WS.prototype.write = function (packets) {
var self = this;
this.writable = false;
// encodePacket efficient as it uses WS framing
// no need for encodePayload
var total = packets.length;
for (var i = 0, l = total; i < l; i++) {
(function (packet) {
parser.encodePacket(packet, self.supportsBinary, function (data) {
if (!self.usingBrowserWebSocket) {
// always create a new object (GH-437)
var opts = {};
if (packet.options) {
opts.compress = packet.options.compress;
}
if (self.perMessageDeflate) {
var len = 'string' === typeof data ? Buffer.byteLength(data) : data.length;
if (len < self.perMessageDeflate.threshold) {
opts.compress = false;
}
}
}
// Sometimes the websocket has already been closed but the browser didn't
// have a chance of informing us about it yet, in that case send will
// throw an error
try {
if (self.usingBrowserWebSocket) {
// TypeError is thrown when passing the second argument on Safari
self.ws.send(data);
} else {
self.ws.send(data, opts);
}
} catch (e) {
debug('websocket closed before onclose event');
}
--total || done();
});
})(packets[i]);
}
function done () {
self.emit('flush');
// fake drain
// defer to next tick to allow Socket to clear writeBuffer
setTimeout(function () {
self.writable = true;
self.emit('drain');
}, 0);
}
};
/**
* Called upon close
*
* @api private
*/
WS.prototype.onClose = function () {
Transport.prototype.onClose.call(this);
};
/**
* Closes socket.
*
* @api private
*/
WS.prototype.doClose = function () {
if (typeof this.ws !== 'undefined') {
this.ws.close();
}
};
/**
* Generates uri for connection.
*
* @api private
*/
WS.prototype.uri = function () {
var query = this.query || {};
var schema = this.secure ? 'wss' : 'ws';
var port = '';
// avoid port if default for schema
if (this.port && (('wss' === schema && Number(this.port) !== 443) ||
('ws' === schema && Number(this.port) !== 80))) {
port = ':' + this.port;
}
// append timestamp to URI
if (this.timestampRequests) {
query[this.timestampParam] = yeast();
}
// communicate binary support capabilities
if (!this.supportsBinary) {
query.b64 = 1;
}
query = parseqs.encode(query);
// prepend ? to query
if (query.length) {
query = '?' + query;
}
var ipv6 = this.hostname.indexOf(':') !== -1;
return schema + '://' + (ipv6 ? '[' + this.hostname + ']' : this.hostname) + port + this.path + query;
};
/**
* Feature detection for WebSocket.
*
* @return {Boolean} whether this transport is available.
* @api public
*/
WS.prototype.check = function () {
return !!WebSocketImpl && !('__initialize' in WebSocketImpl && this.name === WS.prototype.name);
};

38
node_modules/engine.io-client/lib/xmlhttprequest.js generated vendored Normal file
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// browser shim for xmlhttprequest module
var hasCORS = require('has-cors');
var globalThis = require('./globalThis');
module.exports = function (opts) {
var xdomain = opts.xdomain;
// scheme must be same when usign XDomainRequest
// http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx
var xscheme = opts.xscheme;
// XDomainRequest has a flow of not sending cookie, therefore it should be disabled as a default.
// https://github.com/Automattic/engine.io-client/pull/217
var enablesXDR = opts.enablesXDR;
// XMLHttpRequest can be disabled on IE
try {
if ('undefined' !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
return new XMLHttpRequest();
}
} catch (e) { }
// Use XDomainRequest for IE8 if enablesXDR is true
// because loading bar keeps flashing when using jsonp-polling
// https://github.com/yujiosaka/socke.io-ie8-loading-example
try {
if ('undefined' !== typeof XDomainRequest && !xscheme && enablesXDR) {
return new XDomainRequest();
}
} catch (e) { }
if (!xdomain) {
try {
return new globalThis[['Active'].concat('Object').join('X')]('Microsoft.XMLHTTP');
} catch (e) { }
}
};

112
node_modules/engine.io-client/package.json generated vendored Normal file
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{
"_from": "engine.io-client@~3.5.0",
"_id": "engine.io-client@3.5.0",
"_inBundle": false,
"_integrity": "sha512-12wPRfMrugVw/DNyJk34GQ5vIVArEcVMXWugQGGuw2XxUSztFNmJggZmv8IZlLyEdnpO1QB9LkcjeWewO2vxtA==",
"_location": "/engine.io-client",
"_phantomChildren": {},
"_requested": {
"type": "range",
"registry": true,
"raw": "engine.io-client@~3.5.0",
"name": "engine.io-client",
"escapedName": "engine.io-client",
"rawSpec": "~3.5.0",
"saveSpec": null,
"fetchSpec": "~3.5.0"
},
"_requiredBy": [
"/socket.io-client"
],
"_resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-3.5.0.tgz",
"_shasum": "fc1b4d9616288ce4f2daf06dcf612413dec941c7",
"_spec": "engine.io-client@~3.5.0",
"_where": "/Users/vigdorov/self-dev/examples-for-kids/node_modules/socket.io-client",
"browser": {
"ws": false,
"xmlhttprequest-ssl": "./lib/xmlhttprequest.js",
"./lib/globalThis.js": "./lib/globalThis.browser.js"
},
"bugs": {
"url": "https://github.com/socketio/engine.io-client/issues"
},
"bundleDependencies": false,
"contributors": [
{
"name": "Guillermo Rauch",
"email": "rauchg@gmail.com"
},
{
"name": "Vladimir Dronnikov",
"email": "dronnikov@gmail.com"
},
{
"name": "Christoph Dorn",
"url": "https://github.com/cadorn"
},
{
"name": "Mark Mokryn",
"email": "mokesmokes@gmail.com"
}
],
"dependencies": {
"component-emitter": "~1.3.0",
"component-inherit": "0.0.3",
"debug": "~3.1.0",
"engine.io-parser": "~2.2.0",
"has-cors": "1.1.0",
"indexof": "0.0.1",
"parseqs": "0.0.6",
"parseuri": "0.0.6",
"ws": "~7.4.2",
"xmlhttprequest-ssl": "~1.5.4",
"yeast": "0.1.2"
},
"deprecated": false,
"description": "Client for the realtime Engine",
"devDependencies": {
"babel-core": "^6.24.0",
"babel-eslint": "4.1.7",
"babel-loader": "^6.4.1",
"babel-preset-es2015": "^6.24.0",
"blob": "^0.0.4",
"concat-stream": "^1.6.0",
"del": "^2.2.2",
"derequire": "^2.0.6",
"engine.io": "3.4.0",
"eslint-config-standard": "4.4.0",
"eslint-plugin-standard": "1.3.1",
"expect.js": "^0.3.1",
"express": "4.15.2",
"gulp": "3.9.1",
"gulp-eslint": "1.1.1",
"gulp-file": "^0.3.0",
"gulp-istanbul": "^1.1.1",
"gulp-mocha": "^4.3.0",
"gulp-task-listing": "1.0.1",
"istanbul": "^0.4.5",
"mocha": "^3.2.0",
"webpack": "1.12.12",
"webpack-stream": "^3.2.0",
"zuul": "3.11.1",
"zuul-builder-webpack": "^1.2.0",
"zuul-ngrok": "4.0.0"
},
"files": [
"index.js",
"lib/",
"engine.io.js"
],
"homepage": "https://github.com/socketio/engine.io-client",
"license": "MIT",
"main": "lib/index.js",
"name": "engine.io-client",
"repository": {
"type": "git",
"url": "git+https://github.com/socketio/engine.io-client.git"
},
"scripts": {
"test": "gulp test"
},
"version": "3.5.0"
}