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{
"name": "mock_ws_server",
"version": "1.0.0",
"lockfileVersion": 2,
"requires": true,
"packages": {
"node_modules/ws": {
"version": "8.2.3",
"resolved": "https://registry.npmjs.org/ws/-/ws-8.2.3.tgz",
"integrity": "sha512-wBuoj1BDpC6ZQ1B7DWQBYVLphPWkm8i9Y0/3YdHjHKHiohOJ1ws+3OccDWtH+PoC9DZD5WOTrJvNbWvjS6JWaA==",
"engines": {
"node": ">=10.0.0"
},
"peerDependencies": {
"bufferutil": "^4.0.1",
"utf-8-validate": "^5.0.2"
},
"peerDependenciesMeta": {
"bufferutil": {
"optional": true
},
"utf-8-validate": {
"optional": true
}
}
}
}
}

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Copyright (c) 2011 Einar Otto Stangvik <einaros@gmail.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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# ws: a Node.js WebSocket library
[![Version npm](https://img.shields.io/npm/v/ws.svg?logo=npm)](https://www.npmjs.com/package/ws)
[![CI](https://img.shields.io/github/workflow/status/websockets/ws/CI/master?label=CI&logo=github)](https://github.com/websockets/ws/actions?query=workflow%3ACI+branch%3Amaster)
[![Coverage Status](https://img.shields.io/coveralls/websockets/ws/master.svg?logo=coveralls)](https://coveralls.io/github/websockets/ws)
ws is a simple to use, blazing fast, and thoroughly tested WebSocket client and
server implementation.
Passes the quite extensive Autobahn test suite: [server][server-report],
[client][client-report].
**Note**: This module does not work in the browser. The client in the docs is a
reference to a back end with the role of a client in the WebSocket
communication. Browser clients must use the native
[`WebSocket`](https://developer.mozilla.org/en-US/docs/Web/API/WebSocket)
object. To make the same code work seamlessly on Node.js and the browser, you
can use one of the many wrappers available on npm, like
[isomorphic-ws](https://github.com/heineiuo/isomorphic-ws).
## Table of Contents
- [Protocol support](#protocol-support)
- [Installing](#installing)
- [Opt-in for performance](#opt-in-for-performance)
- [API docs](#api-docs)
- [WebSocket compression](#websocket-compression)
- [Usage examples](#usage-examples)
- [Sending and receiving text data](#sending-and-receiving-text-data)
- [Sending binary data](#sending-binary-data)
- [Simple server](#simple-server)
- [External HTTP/S server](#external-https-server)
- [Multiple servers sharing a single HTTP/S server](#multiple-servers-sharing-a-single-https-server)
- [Client authentication](#client-authentication)
- [Server broadcast](#server-broadcast)
- [echo.websocket.org demo](#echowebsocketorg-demo)
- [Use the Node.js streams API](#use-the-nodejs-streams-api)
- [Other examples](#other-examples)
- [FAQ](#faq)
- [How to get the IP address of the client?](#how-to-get-the-ip-address-of-the-client)
- [How to detect and close broken connections?](#how-to-detect-and-close-broken-connections)
- [How to connect via a proxy?](#how-to-connect-via-a-proxy)
- [Changelog](#changelog)
- [License](#license)
## Protocol support
- **HyBi drafts 07-12** (Use the option `protocolVersion: 8`)
- **HyBi drafts 13-17** (Current default, alternatively option
`protocolVersion: 13`)
## Installing
```
npm install ws
```
### Opt-in for performance
There are 2 optional modules that can be installed along side with the ws
module. These modules are binary addons which improve certain operations.
Prebuilt binaries are available for the most popular platforms so you don't
necessarily need to have a C++ compiler installed on your machine.
- `npm install --save-optional bufferutil`: Allows to efficiently perform
operations such as masking and unmasking the data payload of the WebSocket
frames.
- `npm install --save-optional utf-8-validate`: Allows to efficiently check if a
message contains valid UTF-8.
## API docs
See [`/doc/ws.md`](./doc/ws.md) for Node.js-like documentation of ws classes and
utility functions.
## WebSocket compression
ws supports the [permessage-deflate extension][permessage-deflate] which enables
the client and server to negotiate a compression algorithm and its parameters,
and then selectively apply it to the data payloads of each WebSocket message.
The extension is disabled by default on the server and enabled by default on the
client. It adds a significant overhead in terms of performance and memory
consumption so we suggest to enable it only if it is really needed.
Note that Node.js has a variety of issues with high-performance compression,
where increased concurrency, especially on Linux, can lead to [catastrophic
memory fragmentation][node-zlib-bug] and slow performance. If you intend to use
permessage-deflate in production, it is worthwhile to set up a test
representative of your workload and ensure Node.js/zlib will handle it with
acceptable performance and memory usage.
Tuning of permessage-deflate can be done via the options defined below. You can
also use `zlibDeflateOptions` and `zlibInflateOptions`, which is passed directly
into the creation of [raw deflate/inflate streams][node-zlib-deflaterawdocs].
See [the docs][ws-server-options] for more options.
```js
import WebSocket, { WebSocketServer } from 'ws';
const wss = new WebSocketServer({
port: 8080,
perMessageDeflate: {
zlibDeflateOptions: {
// See zlib defaults.
chunkSize: 1024,
memLevel: 7,
level: 3
},
zlibInflateOptions: {
chunkSize: 10 * 1024
},
// Other options settable:
clientNoContextTakeover: true, // Defaults to negotiated value.
serverNoContextTakeover: true, // Defaults to negotiated value.
serverMaxWindowBits: 10, // Defaults to negotiated value.
// Below options specified as default values.
concurrencyLimit: 10, // Limits zlib concurrency for perf.
threshold: 1024 // Size (in bytes) below which messages
// should not be compressed if context takeover is disabled.
}
});
```
The client will only use the extension if it is supported and enabled on the
server. To always disable the extension on the client set the
`perMessageDeflate` option to `false`.
```js
import WebSocket from 'ws';
const ws = new WebSocket('ws://www.host.com/path', {
perMessageDeflate: false
});
```
## Usage examples
### Sending and receiving text data
```js
import WebSocket from 'ws';
const ws = new WebSocket('ws://www.host.com/path');
ws.on('open', function open() {
ws.send('something');
});
ws.on('message', function incoming(message) {
console.log('received: %s', message);
});
```
### Sending binary data
```js
import WebSocket from 'ws';
const ws = new WebSocket('ws://www.host.com/path');
ws.on('open', function open() {
const array = new Float32Array(5);
for (var i = 0; i < array.length; ++i) {
array[i] = i / 2;
}
ws.send(array);
});
```
### Simple server
```js
import { WebSocketServer } from 'ws';
const wss = new WebSocketServer({ port: 8080 });
wss.on('connection', function connection(ws) {
ws.on('message', function incoming(message) {
console.log('received: %s', message);
});
ws.send('something');
});
```
### External HTTP/S server
```js
import { createServer } from 'https';
import { readFileSync } from 'fs';
import { WebSocketServer } from 'ws';
const server = createServer({
cert: readFileSync('/path/to/cert.pem'),
key: readFileSync('/path/to/key.pem')
});
const wss = new WebSocketServer({ server });
wss.on('connection', function connection(ws) {
ws.on('message', function incoming(message) {
console.log('received: %s', message);
});
ws.send('something');
});
server.listen(8080);
```
### Multiple servers sharing a single HTTP/S server
```js
import { createServer } from 'http';
import { parse } from 'url';
import { WebSocketServer } from 'ws';
const server = createServer();
const wss1 = new WebSocketServer({ noServer: true });
const wss2 = new WebSocketServer({ noServer: true });
wss1.on('connection', function connection(ws) {
// ...
});
wss2.on('connection', function connection(ws) {
// ...
});
server.on('upgrade', function upgrade(request, socket, head) {
const { pathname } = parse(request.url);
if (pathname === '/foo') {
wss1.handleUpgrade(request, socket, head, function done(ws) {
wss1.emit('connection', ws, request);
});
} else if (pathname === '/bar') {
wss2.handleUpgrade(request, socket, head, function done(ws) {
wss2.emit('connection', ws, request);
});
} else {
socket.destroy();
}
});
server.listen(8080);
```
### Client authentication
```js
import WebSocket from 'ws';
import { createServer } from 'http';
const server = createServer();
const wss = new WebSocketServer({ noServer: true });
wss.on('connection', function connection(ws, request, client) {
ws.on('message', function message(msg) {
console.log(`Received message ${msg} from user ${client}`);
});
});
server.on('upgrade', function upgrade(request, socket, head) {
// This function is not defined on purpose. Implement it with your own logic.
authenticate(request, (err, client) => {
if (err || !client) {
socket.write('HTTP/1.1 401 Unauthorized\r\n\r\n');
socket.destroy();
return;
}
wss.handleUpgrade(request, socket, head, function done(ws) {
wss.emit('connection', ws, request, client);
});
});
});
server.listen(8080);
```
Also see the provided [example][session-parse-example] using `express-session`.
### Server broadcast
A client WebSocket broadcasting to all connected WebSocket clients, including
itself.
```js
import WebSocket, { WebSocketServer } from 'ws';
const wss = new WebSocketServer({ port: 8080 });
wss.on('connection', function connection(ws) {
ws.on('message', function incoming(data, isBinary) {
wss.clients.forEach(function each(client) {
if (client.readyState === WebSocket.OPEN) {
client.send(data, { binary: isBinary });
}
});
});
});
```
A client WebSocket broadcasting to every other connected WebSocket clients,
excluding itself.
```js
import WebSocket, { WebSocketServer } from 'ws';
const wss = new WebSocketServer({ port: 8080 });
wss.on('connection', function connection(ws) {
ws.on('message', function incoming(data, isBinary) {
wss.clients.forEach(function each(client) {
if (client !== ws && client.readyState === WebSocket.OPEN) {
client.send(data, { binary: isBinary });
}
});
});
});
```
### echo.websocket.org demo
```js
import WebSocket from 'ws';
const ws = new WebSocket('wss://echo.websocket.org/', {
origin: 'https://websocket.org'
});
ws.on('open', function open() {
console.log('connected');
ws.send(Date.now());
});
ws.on('close', function close() {
console.log('disconnected');
});
ws.on('message', function incoming(data) {
console.log(`Roundtrip time: ${Date.now() - data} ms`);
setTimeout(function timeout() {
ws.send(Date.now());
}, 500);
});
```
### Use the Node.js streams API
```js
import WebSocket, { createWebSocketStream } from 'ws';
const ws = new WebSocket('wss://echo.websocket.org/', {
origin: 'https://websocket.org'
});
const duplex = createWebSocketStream(ws, { encoding: 'utf8' });
duplex.pipe(process.stdout);
process.stdin.pipe(duplex);
```
### Other examples
For a full example with a browser client communicating with a ws server, see the
examples folder.
Otherwise, see the test cases.
## FAQ
### How to get the IP address of the client?
The remote IP address can be obtained from the raw socket.
```js
import { WebSocketServer } from 'ws';
const wss = new WebSocketServer({ port: 8080 });
wss.on('connection', function connection(ws, req) {
const ip = req.socket.remoteAddress;
});
```
When the server runs behind a proxy like NGINX, the de-facto standard is to use
the `X-Forwarded-For` header.
```js
wss.on('connection', function connection(ws, req) {
const ip = req.headers['x-forwarded-for'].split(',')[0].trim();
});
```
### How to detect and close broken connections?
Sometimes the link between the server and the client can be interrupted in a way
that keeps both the server and the client unaware of the broken state of the
connection (e.g. when pulling the cord).
In these cases ping messages can be used as a means to verify that the remote
endpoint is still responsive.
```js
import { WebSocketServer } from 'ws';
function heartbeat() {
this.isAlive = true;
}
const wss = new WebSocketServer({ port: 8080 });
wss.on('connection', function connection(ws) {
ws.isAlive = true;
ws.on('pong', heartbeat);
});
const interval = setInterval(function ping() {
wss.clients.forEach(function each(ws) {
if (ws.isAlive === false) return ws.terminate();
ws.isAlive = false;
ws.ping();
});
}, 30000);
wss.on('close', function close() {
clearInterval(interval);
});
```
Pong messages are automatically sent in response to ping messages as required by
the spec.
Just like the server example above your clients might as well lose connection
without knowing it. You might want to add a ping listener on your clients to
prevent that. A simple implementation would be:
```js
import WebSocket from 'ws';
function heartbeat() {
clearTimeout(this.pingTimeout);
// Use `WebSocket#terminate()`, which immediately destroys the connection,
// instead of `WebSocket#close()`, which waits for the close timer.
// Delay should be equal to the interval at which your server
// sends out pings plus a conservative assumption of the latency.
this.pingTimeout = setTimeout(() => {
this.terminate();
}, 30000 + 1000);
}
const client = new WebSocket('wss://echo.websocket.org/');
client.on('open', heartbeat);
client.on('ping', heartbeat);
client.on('close', function clear() {
clearTimeout(this.pingTimeout);
});
```
### How to connect via a proxy?
Use a custom `http.Agent` implementation like [https-proxy-agent][] or
[socks-proxy-agent][].
## Changelog
We're using the GitHub [releases][changelog] for changelog entries.
## License
[MIT](LICENSE)
[changelog]: https://github.com/websockets/ws/releases
[client-report]: http://websockets.github.io/ws/autobahn/clients/
[https-proxy-agent]: https://github.com/TooTallNate/node-https-proxy-agent
[node-zlib-bug]: https://github.com/nodejs/node/issues/8871
[node-zlib-deflaterawdocs]:
https://nodejs.org/api/zlib.html#zlib_zlib_createdeflateraw_options
[permessage-deflate]: https://tools.ietf.org/html/rfc7692
[server-report]: http://websockets.github.io/ws/autobahn/servers/
[session-parse-example]: ./examples/express-session-parse
[socks-proxy-agent]: https://github.com/TooTallNate/node-socks-proxy-agent
[ws-server-options]:
https://github.com/websockets/ws/blob/master/doc/ws.md#new-websocketserveroptions-callback

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'use strict';
module.exports = function () {
throw new Error(
'ws does not work in the browser. Browser clients must use the native ' +
'WebSocket object'
);
};

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'use strict';
const WebSocket = require('./lib/websocket');
WebSocket.createWebSocketStream = require('./lib/stream');
WebSocket.Server = require('./lib/websocket-server');
WebSocket.Receiver = require('./lib/receiver');
WebSocket.Sender = require('./lib/sender');
WebSocket.WebSocket = WebSocket;
WebSocket.WebSocketServer = WebSocket.Server;
module.exports = WebSocket;

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'use strict';
const { EMPTY_BUFFER } = require('./constants');
/**
* Merges an array of buffers into a new buffer.
*
* @param {Buffer[]} list The array of buffers to concat
* @param {Number} totalLength The total length of buffers in the list
* @return {Buffer} The resulting buffer
* @public
*/
function concat(list, totalLength) {
if (list.length === 0) return EMPTY_BUFFER;
if (list.length === 1) return list[0];
const target = Buffer.allocUnsafe(totalLength);
let offset = 0;
for (let i = 0; i < list.length; i++) {
const buf = list[i];
target.set(buf, offset);
offset += buf.length;
}
if (offset < totalLength) return target.slice(0, offset);
return target;
}
/**
* Masks a buffer using the given mask.
*
* @param {Buffer} source The buffer to mask
* @param {Buffer} mask The mask to use
* @param {Buffer} output The buffer where to store the result
* @param {Number} offset The offset at which to start writing
* @param {Number} length The number of bytes to mask.
* @public
*/
function _mask(source, mask, output, offset, length) {
for (let i = 0; i < length; i++) {
output[offset + i] = source[i] ^ mask[i & 3];
}
}
/**
* Unmasks a buffer using the given mask.
*
* @param {Buffer} buffer The buffer to unmask
* @param {Buffer} mask The mask to use
* @public
*/
function _unmask(buffer, mask) {
for (let i = 0; i < buffer.length; i++) {
buffer[i] ^= mask[i & 3];
}
}
/**
* Converts a buffer to an `ArrayBuffer`.
*
* @param {Buffer} buf The buffer to convert
* @return {ArrayBuffer} Converted buffer
* @public
*/
function toArrayBuffer(buf) {
if (buf.byteLength === buf.buffer.byteLength) {
return buf.buffer;
}
return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength);
}
/**
* Converts `data` to a `Buffer`.
*
* @param {*} data The data to convert
* @return {Buffer} The buffer
* @throws {TypeError}
* @public
*/
function toBuffer(data) {
toBuffer.readOnly = true;
if (Buffer.isBuffer(data)) return data;
let buf;
if (data instanceof ArrayBuffer) {
buf = Buffer.from(data);
} else if (ArrayBuffer.isView(data)) {
buf = Buffer.from(data.buffer, data.byteOffset, data.byteLength);
} else {
buf = Buffer.from(data);
toBuffer.readOnly = false;
}
return buf;
}
try {
const bufferUtil = require('bufferutil');
module.exports = {
concat,
mask(source, mask, output, offset, length) {
if (length < 48) _mask(source, mask, output, offset, length);
else bufferUtil.mask(source, mask, output, offset, length);
},
toArrayBuffer,
toBuffer,
unmask(buffer, mask) {
if (buffer.length < 32) _unmask(buffer, mask);
else bufferUtil.unmask(buffer, mask);
}
};
} catch (e) /* istanbul ignore next */ {
module.exports = {
concat,
mask: _mask,
toArrayBuffer,
toBuffer,
unmask: _unmask
};
}

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'use strict';
module.exports = {
BINARY_TYPES: ['nodebuffer', 'arraybuffer', 'fragments'],
EMPTY_BUFFER: Buffer.alloc(0),
GUID: '258EAFA5-E914-47DA-95CA-C5AB0DC85B11',
kForOnEventAttribute: Symbol('kIsForOnEventAttribute'),
kListener: Symbol('kListener'),
kStatusCode: Symbol('status-code'),
kWebSocket: Symbol('websocket'),
NOOP: () => {}
};

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'use strict';
const { kForOnEventAttribute, kListener } = require('./constants');
const kCode = Symbol('kCode');
const kData = Symbol('kData');
const kError = Symbol('kError');
const kMessage = Symbol('kMessage');
const kReason = Symbol('kReason');
const kTarget = Symbol('kTarget');
const kType = Symbol('kType');
const kWasClean = Symbol('kWasClean');
/**
* Class representing an event.
*/
class Event {
/**
* Create a new `Event`.
*
* @param {String} type The name of the event
* @throws {TypeError} If the `type` argument is not specified
*/
constructor(type) {
this[kTarget] = null;
this[kType] = type;
}
/**
* @type {*}
*/
get target() {
return this[kTarget];
}
/**
* @type {String}
*/
get type() {
return this[kType];
}
}
Object.defineProperty(Event.prototype, 'target', { enumerable: true });
Object.defineProperty(Event.prototype, 'type', { enumerable: true });
/**
* Class representing a close event.
*
* @extends Event
*/
class CloseEvent extends Event {
/**
* Create a new `CloseEvent`.
*
* @param {String} type The name of the event
* @param {Object} [options] A dictionary object that allows for setting
* attributes via object members of the same name
* @param {Number} [options.code=0] The status code explaining why the
* connection was closed
* @param {String} [options.reason=''] A human-readable string explaining why
* the connection was closed
* @param {Boolean} [options.wasClean=false] Indicates whether or not the
* connection was cleanly closed
*/
constructor(type, options = {}) {
super(type);
this[kCode] = options.code === undefined ? 0 : options.code;
this[kReason] = options.reason === undefined ? '' : options.reason;
this[kWasClean] = options.wasClean === undefined ? false : options.wasClean;
}
/**
* @type {Number}
*/
get code() {
return this[kCode];
}
/**
* @type {String}
*/
get reason() {
return this[kReason];
}
/**
* @type {Boolean}
*/
get wasClean() {
return this[kWasClean];
}
}
Object.defineProperty(CloseEvent.prototype, 'code', { enumerable: true });
Object.defineProperty(CloseEvent.prototype, 'reason', { enumerable: true });
Object.defineProperty(CloseEvent.prototype, 'wasClean', { enumerable: true });
/**
* Class representing an error event.
*
* @extends Event
*/
class ErrorEvent extends Event {
/**
* Create a new `ErrorEvent`.
*
* @param {String} type The name of the event
* @param {Object} [options] A dictionary object that allows for setting
* attributes via object members of the same name
* @param {*} [options.error=null] The error that generated this event
* @param {String} [options.message=''] The error message
*/
constructor(type, options = {}) {
super(type);
this[kError] = options.error === undefined ? null : options.error;
this[kMessage] = options.message === undefined ? '' : options.message;
}
/**
* @type {*}
*/
get error() {
return this[kError];
}
/**
* @type {String}
*/
get message() {
return this[kMessage];
}
}
Object.defineProperty(ErrorEvent.prototype, 'error', { enumerable: true });
Object.defineProperty(ErrorEvent.prototype, 'message', { enumerable: true });
/**
* Class representing a message event.
*
* @extends Event
*/
class MessageEvent extends Event {
/**
* Create a new `MessageEvent`.
*
* @param {String} type The name of the event
* @param {Object} [options] A dictionary object that allows for setting
* attributes via object members of the same name
* @param {*} [options.data=null] The message content
*/
constructor(type, options = {}) {
super(type);
this[kData] = options.data === undefined ? null : options.data;
}
/**
* @type {*}
*/
get data() {
return this[kData];
}
}
Object.defineProperty(MessageEvent.prototype, 'data', { enumerable: true });
/**
* This provides methods for emulating the `EventTarget` interface. It's not
* meant to be used directly.
*
* @mixin
*/
const EventTarget = {
/**
* Register an event listener.
*
* @param {String} type A string representing the event type to listen for
* @param {Function} listener The listener to add
* @param {Object} [options] An options object specifies characteristics about
* the event listener
* @param {Boolean} [options.once=false] A `Boolean` indicating that the
* listener should be invoked at most once after being added. If `true`,
* the listener would be automatically removed when invoked.
* @public
*/
addEventListener(type, listener, options = {}) {
let wrapper;
if (type === 'message') {
wrapper = function onMessage(data, isBinary) {
const event = new MessageEvent('message', {
data: isBinary ? data : data.toString()
});
event[kTarget] = this;
listener.call(this, event);
};
} else if (type === 'close') {
wrapper = function onClose(code, message) {
const event = new CloseEvent('close', {
code,
reason: message.toString(),
wasClean: this._closeFrameReceived && this._closeFrameSent
});
event[kTarget] = this;
listener.call(this, event);
};
} else if (type === 'error') {
wrapper = function onError(error) {
const event = new ErrorEvent('error', {
error,
message: error.message
});
event[kTarget] = this;
listener.call(this, event);
};
} else if (type === 'open') {
wrapper = function onOpen() {
const event = new Event('open');
event[kTarget] = this;
listener.call(this, event);
};
} else {
return;
}
wrapper[kForOnEventAttribute] = !!options[kForOnEventAttribute];
wrapper[kListener] = listener;
if (options.once) {
this.once(type, wrapper);
} else {
this.on(type, wrapper);
}
},
/**
* Remove an event listener.
*
* @param {String} type A string representing the event type to remove
* @param {Function} handler The listener to remove
* @public
*/
removeEventListener(type, handler) {
for (const listener of this.listeners(type)) {
if (listener[kListener] === handler && !listener[kForOnEventAttribute]) {
this.removeListener(type, listener);
break;
}
}
}
};
module.exports = {
CloseEvent,
ErrorEvent,
Event,
EventTarget,
MessageEvent
};

203
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'use strict';
const { tokenChars } = require('./validation');
/**
* Adds an offer to the map of extension offers or a parameter to the map of
* parameters.
*
* @param {Object} dest The map of extension offers or parameters
* @param {String} name The extension or parameter name
* @param {(Object|Boolean|String)} elem The extension parameters or the
* parameter value
* @private
*/
function push(dest, name, elem) {
if (dest[name] === undefined) dest[name] = [elem];
else dest[name].push(elem);
}
/**
* Parses the `Sec-WebSocket-Extensions` header into an object.
*
* @param {String} header The field value of the header
* @return {Object} The parsed object
* @public
*/
function parse(header) {
const offers = Object.create(null);
let params = Object.create(null);
let mustUnescape = false;
let isEscaping = false;
let inQuotes = false;
let extensionName;
let paramName;
let start = -1;
let code = -1;
let end = -1;
let i = 0;
for (; i < header.length; i++) {
code = header.charCodeAt(i);
if (extensionName === undefined) {
if (end === -1 && tokenChars[code] === 1) {
if (start === -1) start = i;
} else if (
i !== 0 &&
(code === 0x20 /* ' ' */ || code === 0x09) /* '\t' */
) {
if (end === -1 && start !== -1) end = i;
} else if (code === 0x3b /* ';' */ || code === 0x2c /* ',' */) {
if (start === -1) {
throw new SyntaxError(`Unexpected character at index ${i}`);
}
if (end === -1) end = i;
const name = header.slice(start, end);
if (code === 0x2c) {
push(offers, name, params);
params = Object.create(null);
} else {
extensionName = name;
}
start = end = -1;
} else {
throw new SyntaxError(`Unexpected character at index ${i}`);
}
} else if (paramName === undefined) {
if (end === -1 && tokenChars[code] === 1) {
if (start === -1) start = i;
} else if (code === 0x20 || code === 0x09) {
if (end === -1 && start !== -1) end = i;
} else if (code === 0x3b || code === 0x2c) {
if (start === -1) {
throw new SyntaxError(`Unexpected character at index ${i}`);
}
if (end === -1) end = i;
push(params, header.slice(start, end), true);
if (code === 0x2c) {
push(offers, extensionName, params);
params = Object.create(null);
extensionName = undefined;
}
start = end = -1;
} else if (code === 0x3d /* '=' */ && start !== -1 && end === -1) {
paramName = header.slice(start, i);
start = end = -1;
} else {
throw new SyntaxError(`Unexpected character at index ${i}`);
}
} else {
//
// The value of a quoted-string after unescaping must conform to the
// token ABNF, so only token characters are valid.
// Ref: https://tools.ietf.org/html/rfc6455#section-9.1
//
if (isEscaping) {
if (tokenChars[code] !== 1) {
throw new SyntaxError(`Unexpected character at index ${i}`);
}
if (start === -1) start = i;
else if (!mustUnescape) mustUnescape = true;
isEscaping = false;
} else if (inQuotes) {
if (tokenChars[code] === 1) {
if (start === -1) start = i;
} else if (code === 0x22 /* '"' */ && start !== -1) {
inQuotes = false;
end = i;
} else if (code === 0x5c /* '\' */) {
isEscaping = true;
} else {
throw new SyntaxError(`Unexpected character at index ${i}`);
}
} else if (code === 0x22 && header.charCodeAt(i - 1) === 0x3d) {
inQuotes = true;
} else if (end === -1 && tokenChars[code] === 1) {
if (start === -1) start = i;
} else if (start !== -1 && (code === 0x20 || code === 0x09)) {
if (end === -1) end = i;
} else if (code === 0x3b || code === 0x2c) {
if (start === -1) {
throw new SyntaxError(`Unexpected character at index ${i}`);
}
if (end === -1) end = i;
let value = header.slice(start, end);
if (mustUnescape) {
value = value.replace(/\\/g, '');
mustUnescape = false;
}
push(params, paramName, value);
if (code === 0x2c) {
push(offers, extensionName, params);
params = Object.create(null);
extensionName = undefined;
}
paramName = undefined;
start = end = -1;
} else {
throw new SyntaxError(`Unexpected character at index ${i}`);
}
}
}
if (start === -1 || inQuotes || code === 0x20 || code === 0x09) {
throw new SyntaxError('Unexpected end of input');
}
if (end === -1) end = i;
const token = header.slice(start, end);
if (extensionName === undefined) {
push(offers, token, params);
} else {
if (paramName === undefined) {
push(params, token, true);
} else if (mustUnescape) {
push(params, paramName, token.replace(/\\/g, ''));
} else {
push(params, paramName, token);
}
push(offers, extensionName, params);
}
return offers;
}
/**
* Builds the `Sec-WebSocket-Extensions` header field value.
*
* @param {Object} extensions The map of extensions and parameters to format
* @return {String} A string representing the given object
* @public
*/
function format(extensions) {
return Object.keys(extensions)
.map((extension) => {
let configurations = extensions[extension];
if (!Array.isArray(configurations)) configurations = [configurations];
return configurations
.map((params) => {
return [extension]
.concat(
Object.keys(params).map((k) => {
let values = params[k];
if (!Array.isArray(values)) values = [values];
return values
.map((v) => (v === true ? k : `${k}=${v}`))
.join('; ');
})
)
.join('; ');
})
.join(', ');
})
.join(', ');
}
module.exports = { format, parse };

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'use strict';
const kDone = Symbol('kDone');
const kRun = Symbol('kRun');
/**
* A very simple job queue with adjustable concurrency. Adapted from
* https://github.com/STRML/async-limiter
*/
class Limiter {
/**
* Creates a new `Limiter`.
*
* @param {Number} [concurrency=Infinity] The maximum number of jobs allowed
* to run concurrently
*/
constructor(concurrency) {
this[kDone] = () => {
this.pending--;
this[kRun]();
};
this.concurrency = concurrency || Infinity;
this.jobs = [];
this.pending = 0;
}
/**
* Adds a job to the queue.
*
* @param {Function} job The job to run
* @public
*/
add(job) {
this.jobs.push(job);
this[kRun]();
}
/**
* Removes a job from the queue and runs it if possible.
*
* @private
*/
[kRun]() {
if (this.pending === this.concurrency) return;
if (this.jobs.length) {
const job = this.jobs.shift();
this.pending++;
job(this[kDone]);
}
}
}
module.exports = Limiter;

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'use strict';
const zlib = require('zlib');
const bufferUtil = require('./buffer-util');
const Limiter = require('./limiter');
const { kStatusCode } = require('./constants');
const TRAILER = Buffer.from([0x00, 0x00, 0xff, 0xff]);
const kPerMessageDeflate = Symbol('permessage-deflate');
const kTotalLength = Symbol('total-length');
const kCallback = Symbol('callback');
const kBuffers = Symbol('buffers');
const kError = Symbol('error');
//
// We limit zlib concurrency, which prevents severe memory fragmentation
// as documented in https://github.com/nodejs/node/issues/8871#issuecomment-250915913
// and https://github.com/websockets/ws/issues/1202
//
// Intentionally global; it's the global thread pool that's an issue.
//
let zlibLimiter;
/**
* permessage-deflate implementation.
*/
class PerMessageDeflate {
/**
* Creates a PerMessageDeflate instance.
*
* @param {Object} [options] Configuration options
* @param {(Boolean|Number)} [options.clientMaxWindowBits] Advertise support
* for, or request, a custom client window size
* @param {Boolean} [options.clientNoContextTakeover=false] Advertise/
* acknowledge disabling of client context takeover
* @param {Number} [options.concurrencyLimit=10] The number of concurrent
* calls to zlib
* @param {(Boolean|Number)} [options.serverMaxWindowBits] Request/confirm the
* use of a custom server window size
* @param {Boolean} [options.serverNoContextTakeover=false] Request/accept
* disabling of server context takeover
* @param {Number} [options.threshold=1024] Size (in bytes) below which
* messages should not be compressed if context takeover is disabled
* @param {Object} [options.zlibDeflateOptions] Options to pass to zlib on
* deflate
* @param {Object} [options.zlibInflateOptions] Options to pass to zlib on
* inflate
* @param {Boolean} [isServer=false] Create the instance in either server or
* client mode
* @param {Number} [maxPayload=0] The maximum allowed message length
*/
constructor(options, isServer, maxPayload) {
this._maxPayload = maxPayload | 0;
this._options = options || {};
this._threshold =
this._options.threshold !== undefined ? this._options.threshold : 1024;
this._isServer = !!isServer;
this._deflate = null;
this._inflate = null;
this.params = null;
if (!zlibLimiter) {
const concurrency =
this._options.concurrencyLimit !== undefined
? this._options.concurrencyLimit
: 10;
zlibLimiter = new Limiter(concurrency);
}
}
/**
* @type {String}
*/
static get extensionName() {
return 'permessage-deflate';
}
/**
* Create an extension negotiation offer.
*
* @return {Object} Extension parameters
* @public
*/
offer() {
const params = {};
if (this._options.serverNoContextTakeover) {
params.server_no_context_takeover = true;
}
if (this._options.clientNoContextTakeover) {
params.client_no_context_takeover = true;
}
if (this._options.serverMaxWindowBits) {
params.server_max_window_bits = this._options.serverMaxWindowBits;
}
if (this._options.clientMaxWindowBits) {
params.client_max_window_bits = this._options.clientMaxWindowBits;
} else if (this._options.clientMaxWindowBits == null) {
params.client_max_window_bits = true;
}
return params;
}
/**
* Accept an extension negotiation offer/response.
*
* @param {Array} configurations The extension negotiation offers/reponse
* @return {Object} Accepted configuration
* @public
*/
accept(configurations) {
configurations = this.normalizeParams(configurations);
this.params = this._isServer
? this.acceptAsServer(configurations)
: this.acceptAsClient(configurations);
return this.params;
}
/**
* Releases all resources used by the extension.
*
* @public
*/
cleanup() {
if (this._inflate) {
this._inflate.close();
this._inflate = null;
}
if (this._deflate) {
const callback = this._deflate[kCallback];
this._deflate.close();
this._deflate = null;
if (callback) {
callback(
new Error(
'The deflate stream was closed while data was being processed'
)
);
}
}
}
/**
* Accept an extension negotiation offer.
*
* @param {Array} offers The extension negotiation offers
* @return {Object} Accepted configuration
* @private
*/
acceptAsServer(offers) {
const opts = this._options;
const accepted = offers.find((params) => {
if (
(opts.serverNoContextTakeover === false &&
params.server_no_context_takeover) ||
(params.server_max_window_bits &&
(opts.serverMaxWindowBits === false ||
(typeof opts.serverMaxWindowBits === 'number' &&
opts.serverMaxWindowBits > params.server_max_window_bits))) ||
(typeof opts.clientMaxWindowBits === 'number' &&
!params.client_max_window_bits)
) {
return false;
}
return true;
});
if (!accepted) {
throw new Error('None of the extension offers can be accepted');
}
if (opts.serverNoContextTakeover) {
accepted.server_no_context_takeover = true;
}
if (opts.clientNoContextTakeover) {
accepted.client_no_context_takeover = true;
}
if (typeof opts.serverMaxWindowBits === 'number') {
accepted.server_max_window_bits = opts.serverMaxWindowBits;
}
if (typeof opts.clientMaxWindowBits === 'number') {
accepted.client_max_window_bits = opts.clientMaxWindowBits;
} else if (
accepted.client_max_window_bits === true ||
opts.clientMaxWindowBits === false
) {
delete accepted.client_max_window_bits;
}
return accepted;
}
/**
* Accept the extension negotiation response.
*
* @param {Array} response The extension negotiation response
* @return {Object} Accepted configuration
* @private
*/
acceptAsClient(response) {
const params = response[0];
if (
this._options.clientNoContextTakeover === false &&
params.client_no_context_takeover
) {
throw new Error('Unexpected parameter "client_no_context_takeover"');
}
if (!params.client_max_window_bits) {
if (typeof this._options.clientMaxWindowBits === 'number') {
params.client_max_window_bits = this._options.clientMaxWindowBits;
}
} else if (
this._options.clientMaxWindowBits === false ||
(typeof this._options.clientMaxWindowBits === 'number' &&
params.client_max_window_bits > this._options.clientMaxWindowBits)
) {
throw new Error(
'Unexpected or invalid parameter "client_max_window_bits"'
);
}
return params;
}
/**
* Normalize parameters.
*
* @param {Array} configurations The extension negotiation offers/reponse
* @return {Array} The offers/response with normalized parameters
* @private
*/
normalizeParams(configurations) {
configurations.forEach((params) => {
Object.keys(params).forEach((key) => {
let value = params[key];
if (value.length > 1) {
throw new Error(`Parameter "${key}" must have only a single value`);
}
value = value[0];
if (key === 'client_max_window_bits') {
if (value !== true) {
const num = +value;
if (!Number.isInteger(num) || num < 8 || num > 15) {
throw new TypeError(
`Invalid value for parameter "${key}": ${value}`
);
}
value = num;
} else if (!this._isServer) {
throw new TypeError(
`Invalid value for parameter "${key}": ${value}`
);
}
} else if (key === 'server_max_window_bits') {
const num = +value;
if (!Number.isInteger(num) || num < 8 || num > 15) {
throw new TypeError(
`Invalid value for parameter "${key}": ${value}`
);
}
value = num;
} else if (
key === 'client_no_context_takeover' ||
key === 'server_no_context_takeover'
) {
if (value !== true) {
throw new TypeError(
`Invalid value for parameter "${key}": ${value}`
);
}
} else {
throw new Error(`Unknown parameter "${key}"`);
}
params[key] = value;
});
});
return configurations;
}
/**
* Decompress data. Concurrency limited.
*
* @param {Buffer} data Compressed data
* @param {Boolean} fin Specifies whether or not this is the last fragment
* @param {Function} callback Callback
* @public
*/
decompress(data, fin, callback) {
zlibLimiter.add((done) => {
this._decompress(data, fin, (err, result) => {
done();
callback(err, result);
});
});
}
/**
* Compress data. Concurrency limited.
*
* @param {Buffer} data Data to compress
* @param {Boolean} fin Specifies whether or not this is the last fragment
* @param {Function} callback Callback
* @public
*/
compress(data, fin, callback) {
zlibLimiter.add((done) => {
this._compress(data, fin, (err, result) => {
done();
callback(err, result);
});
});
}
/**
* Decompress data.
*
* @param {Buffer} data Compressed data
* @param {Boolean} fin Specifies whether or not this is the last fragment
* @param {Function} callback Callback
* @private
*/
_decompress(data, fin, callback) {
const endpoint = this._isServer ? 'client' : 'server';
if (!this._inflate) {
const key = `${endpoint}_max_window_bits`;
const windowBits =
typeof this.params[key] !== 'number'
? zlib.Z_DEFAULT_WINDOWBITS
: this.params[key];
this._inflate = zlib.createInflateRaw({
...this._options.zlibInflateOptions,
windowBits
});
this._inflate[kPerMessageDeflate] = this;
this._inflate[kTotalLength] = 0;
this._inflate[kBuffers] = [];
this._inflate.on('error', inflateOnError);
this._inflate.on('data', inflateOnData);
}
this._inflate[kCallback] = callback;
this._inflate.write(data);
if (fin) this._inflate.write(TRAILER);
this._inflate.flush(() => {
const err = this._inflate[kError];
if (err) {
this._inflate.close();
this._inflate = null;
callback(err);
return;
}
const data = bufferUtil.concat(
this._inflate[kBuffers],
this._inflate[kTotalLength]
);
if (this._inflate._readableState.endEmitted) {
this._inflate.close();
this._inflate = null;
} else {
this._inflate[kTotalLength] = 0;
this._inflate[kBuffers] = [];
if (fin && this.params[`${endpoint}_no_context_takeover`]) {
this._inflate.reset();
}
}
callback(null, data);
});
}
/**
* Compress data.
*
* @param {Buffer} data Data to compress
* @param {Boolean} fin Specifies whether or not this is the last fragment
* @param {Function} callback Callback
* @private
*/
_compress(data, fin, callback) {
const endpoint = this._isServer ? 'server' : 'client';
if (!this._deflate) {
const key = `${endpoint}_max_window_bits`;
const windowBits =
typeof this.params[key] !== 'number'
? zlib.Z_DEFAULT_WINDOWBITS
: this.params[key];
this._deflate = zlib.createDeflateRaw({
...this._options.zlibDeflateOptions,
windowBits
});
this._deflate[kTotalLength] = 0;
this._deflate[kBuffers] = [];
this._deflate.on('data', deflateOnData);
}
this._deflate[kCallback] = callback;
this._deflate.write(data);
this._deflate.flush(zlib.Z_SYNC_FLUSH, () => {
if (!this._deflate) {
//
// The deflate stream was closed while data was being processed.
//
return;
}
let data = bufferUtil.concat(
this._deflate[kBuffers],
this._deflate[kTotalLength]
);
if (fin) data = data.slice(0, data.length - 4);
//
// Ensure that the callback will not be called again in
// `PerMessageDeflate#cleanup()`.
//
this._deflate[kCallback] = null;
this._deflate[kTotalLength] = 0;
this._deflate[kBuffers] = [];
if (fin && this.params[`${endpoint}_no_context_takeover`]) {
this._deflate.reset();
}
callback(null, data);
});
}
}
module.exports = PerMessageDeflate;
/**
* The listener of the `zlib.DeflateRaw` stream `'data'` event.
*
* @param {Buffer} chunk A chunk of data
* @private
*/
function deflateOnData(chunk) {
this[kBuffers].push(chunk);
this[kTotalLength] += chunk.length;
}
/**
* The listener of the `zlib.InflateRaw` stream `'data'` event.
*
* @param {Buffer} chunk A chunk of data
* @private
*/
function inflateOnData(chunk) {
this[kTotalLength] += chunk.length;
if (
this[kPerMessageDeflate]._maxPayload < 1 ||
this[kTotalLength] <= this[kPerMessageDeflate]._maxPayload
) {
this[kBuffers].push(chunk);
return;
}
this[kError] = new RangeError('Max payload size exceeded');
this[kError].code = 'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH';
this[kError][kStatusCode] = 1009;
this.removeListener('data', inflateOnData);
this.reset();
}
/**
* The listener of the `zlib.InflateRaw` stream `'error'` event.
*
* @param {Error} err The emitted error
* @private
*/
function inflateOnError(err) {
//
// There is no need to call `Zlib#close()` as the handle is automatically
// closed when an error is emitted.
//
this[kPerMessageDeflate]._inflate = null;
err[kStatusCode] = 1007;
this[kCallback](err);
}

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mock_ws_server/node_modules/ws/lib/receiver.js generated vendored Normal file
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'use strict';
const { Writable } = require('stream');
const PerMessageDeflate = require('./permessage-deflate');
const {
BINARY_TYPES,
EMPTY_BUFFER,
kStatusCode,
kWebSocket
} = require('./constants');
const { concat, toArrayBuffer, unmask } = require('./buffer-util');
const { isValidStatusCode, isValidUTF8 } = require('./validation');
const GET_INFO = 0;
const GET_PAYLOAD_LENGTH_16 = 1;
const GET_PAYLOAD_LENGTH_64 = 2;
const GET_MASK = 3;
const GET_DATA = 4;
const INFLATING = 5;
/**
* HyBi Receiver implementation.
*
* @extends Writable
*/
class Receiver extends Writable {
/**
* Creates a Receiver instance.
*
* @param {Object} [options] Options object
* @param {String} [options.binaryType=nodebuffer] The type for binary data
* @param {Object} [options.extensions] An object containing the negotiated
* extensions
* @param {Boolean} [options.isServer=false] Specifies whether to operate in
* client or server mode
* @param {Number} [options.maxPayload=0] The maximum allowed message length
* @param {Boolean} [options.skipUTF8Validation=false] Specifies whether or
* not to skip UTF-8 validation for text and close messages
*/
constructor(options = {}) {
super();
this._binaryType = options.binaryType || BINARY_TYPES[0];
this._extensions = options.extensions || {};
this._isServer = !!options.isServer;
this._maxPayload = options.maxPayload | 0;
this._skipUTF8Validation = !!options.skipUTF8Validation;
this[kWebSocket] = undefined;
this._bufferedBytes = 0;
this._buffers = [];
this._compressed = false;
this._payloadLength = 0;
this._mask = undefined;
this._fragmented = 0;
this._masked = false;
this._fin = false;
this._opcode = 0;
this._totalPayloadLength = 0;
this._messageLength = 0;
this._fragments = [];
this._state = GET_INFO;
this._loop = false;
}
/**
* Implements `Writable.prototype._write()`.
*
* @param {Buffer} chunk The chunk of data to write
* @param {String} encoding The character encoding of `chunk`
* @param {Function} cb Callback
* @private
*/
_write(chunk, encoding, cb) {
if (this._opcode === 0x08 && this._state == GET_INFO) return cb();
this._bufferedBytes += chunk.length;
this._buffers.push(chunk);
this.startLoop(cb);
}
/**
* Consumes `n` bytes from the buffered data.
*
* @param {Number} n The number of bytes to consume
* @return {Buffer} The consumed bytes
* @private
*/
consume(n) {
this._bufferedBytes -= n;
if (n === this._buffers[0].length) return this._buffers.shift();
if (n < this._buffers[0].length) {
const buf = this._buffers[0];
this._buffers[0] = buf.slice(n);
return buf.slice(0, n);
}
const dst = Buffer.allocUnsafe(n);
do {
const buf = this._buffers[0];
const offset = dst.length - n;
if (n >= buf.length) {
dst.set(this._buffers.shift(), offset);
} else {
dst.set(new Uint8Array(buf.buffer, buf.byteOffset, n), offset);
this._buffers[0] = buf.slice(n);
}
n -= buf.length;
} while (n > 0);
return dst;
}
/**
* Starts the parsing loop.
*
* @param {Function} cb Callback
* @private
*/
startLoop(cb) {
let err;
this._loop = true;
do {
switch (this._state) {
case GET_INFO:
err = this.getInfo();
break;
case GET_PAYLOAD_LENGTH_16:
err = this.getPayloadLength16();
break;
case GET_PAYLOAD_LENGTH_64:
err = this.getPayloadLength64();
break;
case GET_MASK:
this.getMask();
break;
case GET_DATA:
err = this.getData(cb);
break;
default:
// `INFLATING`
this._loop = false;
return;
}
} while (this._loop);
cb(err);
}
/**
* Reads the first two bytes of a frame.
*
* @return {(RangeError|undefined)} A possible error
* @private
*/
getInfo() {
if (this._bufferedBytes < 2) {
this._loop = false;
return;
}
const buf = this.consume(2);
if ((buf[0] & 0x30) !== 0x00) {
this._loop = false;
return error(
RangeError,
'RSV2 and RSV3 must be clear',
true,
1002,
'WS_ERR_UNEXPECTED_RSV_2_3'
);
}
const compressed = (buf[0] & 0x40) === 0x40;
if (compressed && !this._extensions[PerMessageDeflate.extensionName]) {
this._loop = false;
return error(
RangeError,
'RSV1 must be clear',
true,
1002,
'WS_ERR_UNEXPECTED_RSV_1'
);
}
this._fin = (buf[0] & 0x80) === 0x80;
this._opcode = buf[0] & 0x0f;
this._payloadLength = buf[1] & 0x7f;
if (this._opcode === 0x00) {
if (compressed) {
this._loop = false;
return error(
RangeError,
'RSV1 must be clear',
true,
1002,
'WS_ERR_UNEXPECTED_RSV_1'
);
}
if (!this._fragmented) {
this._loop = false;
return error(
RangeError,
'invalid opcode 0',
true,
1002,
'WS_ERR_INVALID_OPCODE'
);
}
this._opcode = this._fragmented;
} else if (this._opcode === 0x01 || this._opcode === 0x02) {
if (this._fragmented) {
this._loop = false;
return error(
RangeError,
`invalid opcode ${this._opcode}`,
true,
1002,
'WS_ERR_INVALID_OPCODE'
);
}
this._compressed = compressed;
} else if (this._opcode > 0x07 && this._opcode < 0x0b) {
if (!this._fin) {
this._loop = false;
return error(
RangeError,
'FIN must be set',
true,
1002,
'WS_ERR_EXPECTED_FIN'
);
}
if (compressed) {
this._loop = false;
return error(
RangeError,
'RSV1 must be clear',
true,
1002,
'WS_ERR_UNEXPECTED_RSV_1'
);
}
if (this._payloadLength > 0x7d) {
this._loop = false;
return error(
RangeError,
`invalid payload length ${this._payloadLength}`,
true,
1002,
'WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH'
);
}
} else {
this._loop = false;
return error(
RangeError,
`invalid opcode ${this._opcode}`,
true,
1002,
'WS_ERR_INVALID_OPCODE'
);
}
if (!this._fin && !this._fragmented) this._fragmented = this._opcode;
this._masked = (buf[1] & 0x80) === 0x80;
if (this._isServer) {
if (!this._masked) {
this._loop = false;
return error(
RangeError,
'MASK must be set',
true,
1002,
'WS_ERR_EXPECTED_MASK'
);
}
} else if (this._masked) {
this._loop = false;
return error(
RangeError,
'MASK must be clear',
true,
1002,
'WS_ERR_UNEXPECTED_MASK'
);
}
if (this._payloadLength === 126) this._state = GET_PAYLOAD_LENGTH_16;
else if (this._payloadLength === 127) this._state = GET_PAYLOAD_LENGTH_64;
else return this.haveLength();
}
/**
* Gets extended payload length (7+16).
*
* @return {(RangeError|undefined)} A possible error
* @private
*/
getPayloadLength16() {
if (this._bufferedBytes < 2) {
this._loop = false;
return;
}
this._payloadLength = this.consume(2).readUInt16BE(0);
return this.haveLength();
}
/**
* Gets extended payload length (7+64).
*
* @return {(RangeError|undefined)} A possible error
* @private
*/
getPayloadLength64() {
if (this._bufferedBytes < 8) {
this._loop = false;
return;
}
const buf = this.consume(8);
const num = buf.readUInt32BE(0);
//
// The maximum safe integer in JavaScript is 2^53 - 1. An error is returned
// if payload length is greater than this number.
//
if (num > Math.pow(2, 53 - 32) - 1) {
this._loop = false;
return error(
RangeError,
'Unsupported WebSocket frame: payload length > 2^53 - 1',
false,
1009,
'WS_ERR_UNSUPPORTED_DATA_PAYLOAD_LENGTH'
);
}
this._payloadLength = num * Math.pow(2, 32) + buf.readUInt32BE(4);
return this.haveLength();
}
/**
* Payload length has been read.
*
* @return {(RangeError|undefined)} A possible error
* @private
*/
haveLength() {
if (this._payloadLength && this._opcode < 0x08) {
this._totalPayloadLength += this._payloadLength;
if (this._totalPayloadLength > this._maxPayload && this._maxPayload > 0) {
this._loop = false;
return error(
RangeError,
'Max payload size exceeded',
false,
1009,
'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH'
);
}
}
if (this._masked) this._state = GET_MASK;
else this._state = GET_DATA;
}
/**
* Reads mask bytes.
*
* @private
*/
getMask() {
if (this._bufferedBytes < 4) {
this._loop = false;
return;
}
this._mask = this.consume(4);
this._state = GET_DATA;
}
/**
* Reads data bytes.
*
* @param {Function} cb Callback
* @return {(Error|RangeError|undefined)} A possible error
* @private
*/
getData(cb) {
let data = EMPTY_BUFFER;
if (this._payloadLength) {
if (this._bufferedBytes < this._payloadLength) {
this._loop = false;
return;
}
data = this.consume(this._payloadLength);
if (this._masked) unmask(data, this._mask);
}
if (this._opcode > 0x07) return this.controlMessage(data);
if (this._compressed) {
this._state = INFLATING;
this.decompress(data, cb);
return;
}
if (data.length) {
//
// This message is not compressed so its length is the sum of the payload
// length of all fragments.
//
this._messageLength = this._totalPayloadLength;
this._fragments.push(data);
}
return this.dataMessage();
}
/**
* Decompresses data.
*
* @param {Buffer} data Compressed data
* @param {Function} cb Callback
* @private
*/
decompress(data, cb) {
const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName];
perMessageDeflate.decompress(data, this._fin, (err, buf) => {
if (err) return cb(err);
if (buf.length) {
this._messageLength += buf.length;
if (this._messageLength > this._maxPayload && this._maxPayload > 0) {
return cb(
error(
RangeError,
'Max payload size exceeded',
false,
1009,
'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH'
)
);
}
this._fragments.push(buf);
}
const er = this.dataMessage();
if (er) return cb(er);
this.startLoop(cb);
});
}
/**
* Handles a data message.
*
* @return {(Error|undefined)} A possible error
* @private
*/
dataMessage() {
if (this._fin) {
const messageLength = this._messageLength;
const fragments = this._fragments;
this._totalPayloadLength = 0;
this._messageLength = 0;
this._fragmented = 0;
this._fragments = [];
if (this._opcode === 2) {
let data;
if (this._binaryType === 'nodebuffer') {
data = concat(fragments, messageLength);
} else if (this._binaryType === 'arraybuffer') {
data = toArrayBuffer(concat(fragments, messageLength));
} else {
data = fragments;
}
this.emit('message', data, true);
} else {
const buf = concat(fragments, messageLength);
if (!this._skipUTF8Validation && !isValidUTF8(buf)) {
this._loop = false;
return error(
Error,
'invalid UTF-8 sequence',
true,
1007,
'WS_ERR_INVALID_UTF8'
);
}
this.emit('message', buf, false);
}
}
this._state = GET_INFO;
}
/**
* Handles a control message.
*
* @param {Buffer} data Data to handle
* @return {(Error|RangeError|undefined)} A possible error
* @private
*/
controlMessage(data) {
if (this._opcode === 0x08) {
this._loop = false;
if (data.length === 0) {
this.emit('conclude', 1005, EMPTY_BUFFER);
this.end();
} else if (data.length === 1) {
return error(
RangeError,
'invalid payload length 1',
true,
1002,
'WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH'
);
} else {
const code = data.readUInt16BE(0);
if (!isValidStatusCode(code)) {
return error(
RangeError,
`invalid status code ${code}`,
true,
1002,
'WS_ERR_INVALID_CLOSE_CODE'
);
}
const buf = data.slice(2);
if (!this._skipUTF8Validation && !isValidUTF8(buf)) {
return error(
Error,
'invalid UTF-8 sequence',
true,
1007,
'WS_ERR_INVALID_UTF8'
);
}
this.emit('conclude', code, buf);
this.end();
}
} else if (this._opcode === 0x09) {
this.emit('ping', data);
} else {
this.emit('pong', data);
}
this._state = GET_INFO;
}
}
module.exports = Receiver;
/**
* Builds an error object.
*
* @param {function(new:Error|RangeError)} ErrorCtor The error constructor
* @param {String} message The error message
* @param {Boolean} prefix Specifies whether or not to add a default prefix to
* `message`
* @param {Number} statusCode The status code
* @param {String} errorCode The exposed error code
* @return {(Error|RangeError)} The error
* @private
*/
function error(ErrorCtor, message, prefix, statusCode, errorCode) {
const err = new ErrorCtor(
prefix ? `Invalid WebSocket frame: ${message}` : message
);
Error.captureStackTrace(err, error);
err.code = errorCode;
err[kStatusCode] = statusCode;
return err;
}

422
mock_ws_server/node_modules/ws/lib/sender.js generated vendored Normal file
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/* eslint no-unused-vars: ["error", { "varsIgnorePattern": "^net|tls$" }] */
'use strict';
const net = require('net');
const tls = require('tls');
const { randomFillSync } = require('crypto');
const PerMessageDeflate = require('./permessage-deflate');
const { EMPTY_BUFFER } = require('./constants');
const { isValidStatusCode } = require('./validation');
const { mask: applyMask, toBuffer } = require('./buffer-util');
const mask = Buffer.alloc(4);
/**
* HyBi Sender implementation.
*/
class Sender {
/**
* Creates a Sender instance.
*
* @param {(net.Socket|tls.Socket)} socket The connection socket
* @param {Object} [extensions] An object containing the negotiated extensions
*/
constructor(socket, extensions) {
this._extensions = extensions || {};
this._socket = socket;
this._firstFragment = true;
this._compress = false;
this._bufferedBytes = 0;
this._deflating = false;
this._queue = [];
}
/**
* Frames a piece of data according to the HyBi WebSocket protocol.
*
* @param {Buffer} data The data to frame
* @param {Object} options Options object
* @param {Boolean} [options.fin=false] Specifies whether or not to set the
* FIN bit
* @param {Boolean} [options.mask=false] Specifies whether or not to mask
* `data`
* @param {Number} options.opcode The opcode
* @param {Boolean} [options.readOnly=false] Specifies whether `data` can be
* modified
* @param {Boolean} [options.rsv1=false] Specifies whether or not to set the
* RSV1 bit
* @return {Buffer[]} The framed data as a list of `Buffer` instances
* @public
*/
static frame(data, options) {
const merge = options.mask && options.readOnly;
let offset = options.mask ? 6 : 2;
let payloadLength = data.length;
if (data.length >= 65536) {
offset += 8;
payloadLength = 127;
} else if (data.length > 125) {
offset += 2;
payloadLength = 126;
}
const target = Buffer.allocUnsafe(merge ? data.length + offset : offset);
target[0] = options.fin ? options.opcode | 0x80 : options.opcode;
if (options.rsv1) target[0] |= 0x40;
target[1] = payloadLength;
if (payloadLength === 126) {
target.writeUInt16BE(data.length, 2);
} else if (payloadLength === 127) {
target.writeUInt32BE(0, 2);
target.writeUInt32BE(data.length, 6);
}
if (!options.mask) return [target, data];
randomFillSync(mask, 0, 4);
target[1] |= 0x80;
target[offset - 4] = mask[0];
target[offset - 3] = mask[1];
target[offset - 2] = mask[2];
target[offset - 1] = mask[3];
if (merge) {
applyMask(data, mask, target, offset, data.length);
return [target];
}
applyMask(data, mask, data, 0, data.length);
return [target, data];
}
/**
* Sends a close message to the other peer.
*
* @param {Number} [code] The status code component of the body
* @param {(String|Buffer)} [data] The message component of the body
* @param {Boolean} [mask=false] Specifies whether or not to mask the message
* @param {Function} [cb] Callback
* @public
*/
close(code, data, mask, cb) {
let buf;
if (code === undefined) {
buf = EMPTY_BUFFER;
} else if (typeof code !== 'number' || !isValidStatusCode(code)) {
throw new TypeError('First argument must be a valid error code number');
} else if (data === undefined || !data.length) {
buf = Buffer.allocUnsafe(2);
buf.writeUInt16BE(code, 0);
} else {
const length = Buffer.byteLength(data);
if (length > 123) {
throw new RangeError('The message must not be greater than 123 bytes');
}
buf = Buffer.allocUnsafe(2 + length);
buf.writeUInt16BE(code, 0);
if (typeof data === 'string') {
buf.write(data, 2);
} else {
buf.set(data, 2);
}
}
if (this._deflating) {
this.enqueue([this.doClose, buf, mask, cb]);
} else {
this.doClose(buf, mask, cb);
}
}
/**
* Frames and sends a close message.
*
* @param {Buffer} data The message to send
* @param {Boolean} [mask=false] Specifies whether or not to mask `data`
* @param {Function} [cb] Callback
* @private
*/
doClose(data, mask, cb) {
this.sendFrame(
Sender.frame(data, {
fin: true,
rsv1: false,
opcode: 0x08,
mask,
readOnly: false
}),
cb
);
}
/**
* Sends a ping message to the other peer.
*
* @param {*} data The message to send
* @param {Boolean} [mask=false] Specifies whether or not to mask `data`
* @param {Function} [cb] Callback
* @public
*/
ping(data, mask, cb) {
const buf = toBuffer(data);
if (buf.length > 125) {
throw new RangeError('The data size must not be greater than 125 bytes');
}
if (this._deflating) {
this.enqueue([this.doPing, buf, mask, toBuffer.readOnly, cb]);
} else {
this.doPing(buf, mask, toBuffer.readOnly, cb);
}
}
/**
* Frames and sends a ping message.
*
* @param {Buffer} data The message to send
* @param {Boolean} [mask=false] Specifies whether or not to mask `data`
* @param {Boolean} [readOnly=false] Specifies whether `data` can be modified
* @param {Function} [cb] Callback
* @private
*/
doPing(data, mask, readOnly, cb) {
this.sendFrame(
Sender.frame(data, {
fin: true,
rsv1: false,
opcode: 0x09,
mask,
readOnly
}),
cb
);
}
/**
* Sends a pong message to the other peer.
*
* @param {*} data The message to send
* @param {Boolean} [mask=false] Specifies whether or not to mask `data`
* @param {Function} [cb] Callback
* @public
*/
pong(data, mask, cb) {
const buf = toBuffer(data);
if (buf.length > 125) {
throw new RangeError('The data size must not be greater than 125 bytes');
}
if (this._deflating) {
this.enqueue([this.doPong, buf, mask, toBuffer.readOnly, cb]);
} else {
this.doPong(buf, mask, toBuffer.readOnly, cb);
}
}
/**
* Frames and sends a pong message.
*
* @param {Buffer} data The message to send
* @param {Boolean} [mask=false] Specifies whether or not to mask `data`
* @param {Boolean} [readOnly=false] Specifies whether `data` can be modified
* @param {Function} [cb] Callback
* @private
*/
doPong(data, mask, readOnly, cb) {
this.sendFrame(
Sender.frame(data, {
fin: true,
rsv1: false,
opcode: 0x0a,
mask,
readOnly
}),
cb
);
}
/**
* Sends a data message to the other peer.
*
* @param {*} data The message to send
* @param {Object} options Options object
* @param {Boolean} [options.binary=false] Specifies whether `data` is binary
* or text
* @param {Boolean} [options.compress=false] Specifies whether or not to
* compress `data`
* @param {Boolean} [options.fin=false] Specifies whether the fragment is the
* last one
* @param {Boolean} [options.mask=false] Specifies whether or not to mask
* `data`
* @param {Function} [cb] Callback
* @public
*/
send(data, options, cb) {
const buf = toBuffer(data);
const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName];
let opcode = options.binary ? 2 : 1;
let rsv1 = options.compress;
if (this._firstFragment) {
this._firstFragment = false;
if (
rsv1 &&
perMessageDeflate &&
perMessageDeflate.params[
perMessageDeflate._isServer
? 'server_no_context_takeover'
: 'client_no_context_takeover'
]
) {
rsv1 = buf.length >= perMessageDeflate._threshold;
}
this._compress = rsv1;
} else {
rsv1 = false;
opcode = 0;
}
if (options.fin) this._firstFragment = true;
if (perMessageDeflate) {
const opts = {
fin: options.fin,
rsv1,
opcode,
mask: options.mask,
readOnly: toBuffer.readOnly
};
if (this._deflating) {
this.enqueue([this.dispatch, buf, this._compress, opts, cb]);
} else {
this.dispatch(buf, this._compress, opts, cb);
}
} else {
this.sendFrame(
Sender.frame(buf, {
fin: options.fin,
rsv1: false,
opcode,
mask: options.mask,
readOnly: toBuffer.readOnly
}),
cb
);
}
}
/**
* Dispatches a data message.
*
* @param {Buffer} data The message to send
* @param {Boolean} [compress=false] Specifies whether or not to compress
* `data`
* @param {Object} options Options object
* @param {Number} options.opcode The opcode
* @param {Boolean} [options.fin=false] Specifies whether or not to set the
* FIN bit
* @param {Boolean} [options.mask=false] Specifies whether or not to mask
* `data`
* @param {Boolean} [options.readOnly=false] Specifies whether `data` can be
* modified
* @param {Boolean} [options.rsv1=false] Specifies whether or not to set the
* RSV1 bit
* @param {Function} [cb] Callback
* @private
*/
dispatch(data, compress, options, cb) {
if (!compress) {
this.sendFrame(Sender.frame(data, options), cb);
return;
}
const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName];
this._bufferedBytes += data.length;
this._deflating = true;
perMessageDeflate.compress(data, options.fin, (_, buf) => {
if (this._socket.destroyed) {
const err = new Error(
'The socket was closed while data was being compressed'
);
if (typeof cb === 'function') cb(err);
for (let i = 0; i < this._queue.length; i++) {
const callback = this._queue[i][4];
if (typeof callback === 'function') callback(err);
}
return;
}
this._bufferedBytes -= data.length;
this._deflating = false;
options.readOnly = false;
this.sendFrame(Sender.frame(buf, options), cb);
this.dequeue();
});
}
/**
* Executes queued send operations.
*
* @private
*/
dequeue() {
while (!this._deflating && this._queue.length) {
const params = this._queue.shift();
this._bufferedBytes -= params[1].length;
Reflect.apply(params[0], this, params.slice(1));
}
}
/**
* Enqueues a send operation.
*
* @param {Array} params Send operation parameters.
* @private
*/
enqueue(params) {
this._bufferedBytes += params[1].length;
this._queue.push(params);
}
/**
* Sends a frame.
*
* @param {Buffer[]} list The frame to send
* @param {Function} [cb] Callback
* @private
*/
sendFrame(list, cb) {
if (list.length === 2) {
this._socket.cork();
this._socket.write(list[0]);
this._socket.write(list[1], cb);
this._socket.uncork();
} else {
this._socket.write(list[0], cb);
}
}
}
module.exports = Sender;

180
mock_ws_server/node_modules/ws/lib/stream.js generated vendored Normal file
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'use strict';
const { Duplex } = require('stream');
/**
* Emits the `'close'` event on a stream.
*
* @param {Duplex} stream The stream.
* @private
*/
function emitClose(stream) {
stream.emit('close');
}
/**
* The listener of the `'end'` event.
*
* @private
*/
function duplexOnEnd() {
if (!this.destroyed && this._writableState.finished) {
this.destroy();
}
}
/**
* The listener of the `'error'` event.
*
* @param {Error} err The error
* @private
*/
function duplexOnError(err) {
this.removeListener('error', duplexOnError);
this.destroy();
if (this.listenerCount('error') === 0) {
// Do not suppress the throwing behavior.
this.emit('error', err);
}
}
/**
* Wraps a `WebSocket` in a duplex stream.
*
* @param {WebSocket} ws The `WebSocket` to wrap
* @param {Object} [options] The options for the `Duplex` constructor
* @return {Duplex} The duplex stream
* @public
*/
function createWebSocketStream(ws, options) {
let resumeOnReceiverDrain = true;
let terminateOnDestroy = true;
function receiverOnDrain() {
if (resumeOnReceiverDrain) ws._socket.resume();
}
if (ws.readyState === ws.CONNECTING) {
ws.once('open', function open() {
ws._receiver.removeAllListeners('drain');
ws._receiver.on('drain', receiverOnDrain);
});
} else {
ws._receiver.removeAllListeners('drain');
ws._receiver.on('drain', receiverOnDrain);
}
const duplex = new Duplex({
...options,
autoDestroy: false,
emitClose: false,
objectMode: false,
writableObjectMode: false
});
ws.on('message', function message(msg, isBinary) {
const data =
!isBinary && duplex._readableState.objectMode ? msg.toString() : msg;
if (!duplex.push(data)) {
resumeOnReceiverDrain = false;
ws._socket.pause();
}
});
ws.once('error', function error(err) {
if (duplex.destroyed) return;
// Prevent `ws.terminate()` from being called by `duplex._destroy()`.
//
// - If the `'error'` event is emitted before the `'open'` event, then
// `ws.terminate()` is a noop as no socket is assigned.
// - Otherwise, the error is re-emitted by the listener of the `'error'`
// event of the `Receiver` object. The listener already closes the
// connection by calling `ws.close()`. This allows a close frame to be
// sent to the other peer. If `ws.terminate()` is called right after this,
// then the close frame might not be sent.
terminateOnDestroy = false;
duplex.destroy(err);
});
ws.once('close', function close() {
if (duplex.destroyed) return;
duplex.push(null);
});
duplex._destroy = function (err, callback) {
if (ws.readyState === ws.CLOSED) {
callback(err);
process.nextTick(emitClose, duplex);
return;
}
let called = false;
ws.once('error', function error(err) {
called = true;
callback(err);
});
ws.once('close', function close() {
if (!called) callback(err);
process.nextTick(emitClose, duplex);
});
if (terminateOnDestroy) ws.terminate();
};
duplex._final = function (callback) {
if (ws.readyState === ws.CONNECTING) {
ws.once('open', function open() {
duplex._final(callback);
});
return;
}
// If the value of the `_socket` property is `null` it means that `ws` is a
// client websocket and the handshake failed. In fact, when this happens, a
// socket is never assigned to the websocket. Wait for the `'error'` event
// that will be emitted by the websocket.
if (ws._socket === null) return;
if (ws._socket._writableState.finished) {
callback();
if (duplex._readableState.endEmitted) duplex.destroy();
} else {
ws._socket.once('finish', function finish() {
// `duplex` is not destroyed here because the `'end'` event will be
// emitted on `duplex` after this `'finish'` event. The EOF signaling
// `null` chunk is, in fact, pushed when the websocket emits `'close'`.
callback();
});
ws.close();
}
};
duplex._read = function () {
if (ws.readyState === ws.OPEN && !resumeOnReceiverDrain) {
resumeOnReceiverDrain = true;
if (!ws._receiver._writableState.needDrain) ws._socket.resume();
}
};
duplex._write = function (chunk, encoding, callback) {
if (ws.readyState === ws.CONNECTING) {
ws.once('open', function open() {
duplex._write(chunk, encoding, callback);
});
return;
}
ws.send(chunk, callback);
};
duplex.on('end', duplexOnEnd);
duplex.on('error', duplexOnError);
return duplex;
}
module.exports = createWebSocketStream;

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'use strict';
const { tokenChars } = require('./validation');
/**
* Parses the `Sec-WebSocket-Protocol` header into a set of subprotocol names.
*
* @param {String} header The field value of the header
* @return {Set} The subprotocol names
* @public
*/
function parse(header) {
const protocols = new Set();
let start = -1;
let end = -1;
let i = 0;
for (i; i < header.length; i++) {
const code = header.charCodeAt(i);
if (end === -1 && tokenChars[code] === 1) {
if (start === -1) start = i;
} else if (
i !== 0 &&
(code === 0x20 /* ' ' */ || code === 0x09) /* '\t' */
) {
if (end === -1 && start !== -1) end = i;
} else if (code === 0x2c /* ',' */) {
if (start === -1) {
throw new SyntaxError(`Unexpected character at index ${i}`);
}
if (end === -1) end = i;
const protocol = header.slice(start, end);
if (protocols.has(protocol)) {
throw new SyntaxError(`The "${protocol}" subprotocol is duplicated`);
}
protocols.add(protocol);
start = end = -1;
} else {
throw new SyntaxError(`Unexpected character at index ${i}`);
}
}
if (start === -1 || end !== -1) {
throw new SyntaxError('Unexpected end of input');
}
const protocol = header.slice(start, i);
if (protocols.has(protocol)) {
throw new SyntaxError(`The "${protocol}" subprotocol is duplicated`);
}
protocols.add(protocol);
return protocols;
}
module.exports = { parse };

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'use strict';
//
// Allowed token characters:
//
// '!', '#', '$', '%', '&', ''', '*', '+', '-',
// '.', 0-9, A-Z, '^', '_', '`', a-z, '|', '~'
//
// tokenChars[32] === 0 // ' '
// tokenChars[33] === 1 // '!'
// tokenChars[34] === 0 // '"'
// ...
//
// prettier-ignore
const tokenChars = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0 - 15
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31
0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, // 32 - 47
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 48 - 63
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64 - 79
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, // 80 - 95
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 96 - 111
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 // 112 - 127
];
/**
* Checks if a status code is allowed in a close frame.
*
* @param {Number} code The status code
* @return {Boolean} `true` if the status code is valid, else `false`
* @public
*/
function isValidStatusCode(code) {
return (
(code >= 1000 &&
code <= 1014 &&
code !== 1004 &&
code !== 1005 &&
code !== 1006) ||
(code >= 3000 && code <= 4999)
);
}
/**
* Checks if a given buffer contains only correct UTF-8.
* Ported from https://www.cl.cam.ac.uk/%7Emgk25/ucs/utf8_check.c by
* Markus Kuhn.
*
* @param {Buffer} buf The buffer to check
* @return {Boolean} `true` if `buf` contains only correct UTF-8, else `false`
* @public
*/
function _isValidUTF8(buf) {
const len = buf.length;
let i = 0;
while (i < len) {
if ((buf[i] & 0x80) === 0) {
// 0xxxxxxx
i++;
} else if ((buf[i] & 0xe0) === 0xc0) {
// 110xxxxx 10xxxxxx
if (
i + 1 === len ||
(buf[i + 1] & 0xc0) !== 0x80 ||
(buf[i] & 0xfe) === 0xc0 // Overlong
) {
return false;
}
i += 2;
} else if ((buf[i] & 0xf0) === 0xe0) {
// 1110xxxx 10xxxxxx 10xxxxxx
if (
i + 2 >= len ||
(buf[i + 1] & 0xc0) !== 0x80 ||
(buf[i + 2] & 0xc0) !== 0x80 ||
(buf[i] === 0xe0 && (buf[i + 1] & 0xe0) === 0x80) || // Overlong
(buf[i] === 0xed && (buf[i + 1] & 0xe0) === 0xa0) // Surrogate (U+D800 - U+DFFF)
) {
return false;
}
i += 3;
} else if ((buf[i] & 0xf8) === 0xf0) {
// 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
if (
i + 3 >= len ||
(buf[i + 1] & 0xc0) !== 0x80 ||
(buf[i + 2] & 0xc0) !== 0x80 ||
(buf[i + 3] & 0xc0) !== 0x80 ||
(buf[i] === 0xf0 && (buf[i + 1] & 0xf0) === 0x80) || // Overlong
(buf[i] === 0xf4 && buf[i + 1] > 0x8f) ||
buf[i] > 0xf4 // > U+10FFFF
) {
return false;
}
i += 4;
} else {
return false;
}
}
return true;
}
try {
const isValidUTF8 = require('utf-8-validate');
module.exports = {
isValidStatusCode,
isValidUTF8(buf) {
return buf.length < 150 ? _isValidUTF8(buf) : isValidUTF8(buf);
},
tokenChars
};
} catch (e) /* istanbul ignore next */ {
module.exports = {
isValidStatusCode,
isValidUTF8: _isValidUTF8,
tokenChars
};
}

485
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/* eslint no-unused-vars: ["error", { "varsIgnorePattern": "^net|tls|https$" }] */
'use strict';
const EventEmitter = require('events');
const http = require('http');
const https = require('https');
const net = require('net');
const tls = require('tls');
const { createHash } = require('crypto');
const extension = require('./extension');
const PerMessageDeflate = require('./permessage-deflate');
const subprotocol = require('./subprotocol');
const WebSocket = require('./websocket');
const { GUID, kWebSocket } = require('./constants');
const keyRegex = /^[+/0-9A-Za-z]{22}==$/;
const RUNNING = 0;
const CLOSING = 1;
const CLOSED = 2;
/**
* Class representing a WebSocket server.
*
* @extends EventEmitter
*/
class WebSocketServer extends EventEmitter {
/**
* Create a `WebSocketServer` instance.
*
* @param {Object} options Configuration options
* @param {Number} [options.backlog=511] The maximum length of the queue of
* pending connections
* @param {Boolean} [options.clientTracking=true] Specifies whether or not to
* track clients
* @param {Function} [options.handleProtocols] A hook to handle protocols
* @param {String} [options.host] The hostname where to bind the server
* @param {Number} [options.maxPayload=104857600] The maximum allowed message
* size
* @param {Boolean} [options.noServer=false] Enable no server mode
* @param {String} [options.path] Accept only connections matching this path
* @param {(Boolean|Object)} [options.perMessageDeflate=false] Enable/disable
* permessage-deflate
* @param {Number} [options.port] The port where to bind the server
* @param {(http.Server|https.Server)} [options.server] A pre-created HTTP/S
* server to use
* @param {Boolean} [options.skipUTF8Validation=false] Specifies whether or
* not to skip UTF-8 validation for text and close messages
* @param {Function} [options.verifyClient] A hook to reject connections
* @param {Function} [callback] A listener for the `listening` event
*/
constructor(options, callback) {
super();
options = {
maxPayload: 100 * 1024 * 1024,
skipUTF8Validation: false,
perMessageDeflate: false,
handleProtocols: null,
clientTracking: true,
verifyClient: null,
noServer: false,
backlog: null, // use default (511 as implemented in net.js)
server: null,
host: null,
path: null,
port: null,
...options
};
if (
(options.port == null && !options.server && !options.noServer) ||
(options.port != null && (options.server || options.noServer)) ||
(options.server && options.noServer)
) {
throw new TypeError(
'One and only one of the "port", "server", or "noServer" options ' +
'must be specified'
);
}
if (options.port != null) {
this._server = http.createServer((req, res) => {
const body = http.STATUS_CODES[426];
res.writeHead(426, {
'Content-Length': body.length,
'Content-Type': 'text/plain'
});
res.end(body);
});
this._server.listen(
options.port,
options.host,
options.backlog,
callback
);
} else if (options.server) {
this._server = options.server;
}
if (this._server) {
const emitConnection = this.emit.bind(this, 'connection');
this._removeListeners = addListeners(this._server, {
listening: this.emit.bind(this, 'listening'),
error: this.emit.bind(this, 'error'),
upgrade: (req, socket, head) => {
this.handleUpgrade(req, socket, head, emitConnection);
}
});
}
if (options.perMessageDeflate === true) options.perMessageDeflate = {};
if (options.clientTracking) {
this.clients = new Set();
this._shouldEmitClose = false;
}
this.options = options;
this._state = RUNNING;
}
/**
* Returns the bound address, the address family name, and port of the server
* as reported by the operating system if listening on an IP socket.
* If the server is listening on a pipe or UNIX domain socket, the name is
* returned as a string.
*
* @return {(Object|String|null)} The address of the server
* @public
*/
address() {
if (this.options.noServer) {
throw new Error('The server is operating in "noServer" mode');
}
if (!this._server) return null;
return this._server.address();
}
/**
* Stop the server from accepting new connections and emit the `'close'` event
* when all existing connections are closed.
*
* @param {Function} [cb] A one-time listener for the `'close'` event
* @public
*/
close(cb) {
if (this._state === CLOSED) {
if (cb) {
this.once('close', () => {
cb(new Error('The server is not running'));
});
}
process.nextTick(emitClose, this);
return;
}
if (cb) this.once('close', cb);
if (this._state === CLOSING) return;
this._state = CLOSING;
if (this.options.noServer || this.options.server) {
if (this._server) {
this._removeListeners();
this._removeListeners = this._server = null;
}
if (this.clients) {
if (!this.clients.size) {
process.nextTick(emitClose, this);
} else {
this._shouldEmitClose = true;
}
} else {
process.nextTick(emitClose, this);
}
} else {
const server = this._server;
this._removeListeners();
this._removeListeners = this._server = null;
//
// The HTTP/S server was created internally. Close it, and rely on its
// `'close'` event.
//
server.close(() => {
emitClose(this);
});
}
}
/**
* See if a given request should be handled by this server instance.
*
* @param {http.IncomingMessage} req Request object to inspect
* @return {Boolean} `true` if the request is valid, else `false`
* @public
*/
shouldHandle(req) {
if (this.options.path) {
const index = req.url.indexOf('?');
const pathname = index !== -1 ? req.url.slice(0, index) : req.url;
if (pathname !== this.options.path) return false;
}
return true;
}
/**
* Handle a HTTP Upgrade request.
*
* @param {http.IncomingMessage} req The request object
* @param {(net.Socket|tls.Socket)} socket The network socket between the
* server and client
* @param {Buffer} head The first packet of the upgraded stream
* @param {Function} cb Callback
* @public
*/
handleUpgrade(req, socket, head, cb) {
socket.on('error', socketOnError);
const key =
req.headers['sec-websocket-key'] !== undefined
? req.headers['sec-websocket-key']
: false;
const version = +req.headers['sec-websocket-version'];
if (
req.method !== 'GET' ||
req.headers.upgrade.toLowerCase() !== 'websocket' ||
!key ||
!keyRegex.test(key) ||
(version !== 8 && version !== 13) ||
!this.shouldHandle(req)
) {
return abortHandshake(socket, 400);
}
const secWebSocketProtocol = req.headers['sec-websocket-protocol'];
let protocols = new Set();
if (secWebSocketProtocol !== undefined) {
try {
protocols = subprotocol.parse(secWebSocketProtocol);
} catch (err) {
return abortHandshake(socket, 400);
}
}
const secWebSocketExtensions = req.headers['sec-websocket-extensions'];
const extensions = {};
if (
this.options.perMessageDeflate &&
secWebSocketExtensions !== undefined
) {
const perMessageDeflate = new PerMessageDeflate(
this.options.perMessageDeflate,
true,
this.options.maxPayload
);
try {
const offers = extension.parse(secWebSocketExtensions);
if (offers[PerMessageDeflate.extensionName]) {
perMessageDeflate.accept(offers[PerMessageDeflate.extensionName]);
extensions[PerMessageDeflate.extensionName] = perMessageDeflate;
}
} catch (err) {
return abortHandshake(socket, 400);
}
}
//
// Optionally call external client verification handler.
//
if (this.options.verifyClient) {
const info = {
origin:
req.headers[`${version === 8 ? 'sec-websocket-origin' : 'origin'}`],
secure: !!(req.socket.authorized || req.socket.encrypted),
req
};
if (this.options.verifyClient.length === 2) {
this.options.verifyClient(info, (verified, code, message, headers) => {
if (!verified) {
return abortHandshake(socket, code || 401, message, headers);
}
this.completeUpgrade(
extensions,
key,
protocols,
req,
socket,
head,
cb
);
});
return;
}
if (!this.options.verifyClient(info)) return abortHandshake(socket, 401);
}
this.completeUpgrade(extensions, key, protocols, req, socket, head, cb);
}
/**
* Upgrade the connection to WebSocket.
*
* @param {Object} extensions The accepted extensions
* @param {String} key The value of the `Sec-WebSocket-Key` header
* @param {Set} protocols The subprotocols
* @param {http.IncomingMessage} req The request object
* @param {(net.Socket|tls.Socket)} socket The network socket between the
* server and client
* @param {Buffer} head The first packet of the upgraded stream
* @param {Function} cb Callback
* @throws {Error} If called more than once with the same socket
* @private
*/
completeUpgrade(extensions, key, protocols, req, socket, head, cb) {
//
// Destroy the socket if the client has already sent a FIN packet.
//
if (!socket.readable || !socket.writable) return socket.destroy();
if (socket[kWebSocket]) {
throw new Error(
'server.handleUpgrade() was called more than once with the same ' +
'socket, possibly due to a misconfiguration'
);
}
if (this._state > RUNNING) return abortHandshake(socket, 503);
const digest = createHash('sha1')
.update(key + GUID)
.digest('base64');
const headers = [
'HTTP/1.1 101 Switching Protocols',
'Upgrade: websocket',
'Connection: Upgrade',
`Sec-WebSocket-Accept: ${digest}`
];
const ws = new WebSocket(null);
if (protocols.size) {
//
// Optionally call external protocol selection handler.
//
const protocol = this.options.handleProtocols
? this.options.handleProtocols(protocols, req)
: protocols.values().next().value;
if (protocol) {
headers.push(`Sec-WebSocket-Protocol: ${protocol}`);
ws._protocol = protocol;
}
}
if (extensions[PerMessageDeflate.extensionName]) {
const params = extensions[PerMessageDeflate.extensionName].params;
const value = extension.format({
[PerMessageDeflate.extensionName]: [params]
});
headers.push(`Sec-WebSocket-Extensions: ${value}`);
ws._extensions = extensions;
}
//
// Allow external modification/inspection of handshake headers.
//
this.emit('headers', headers, req);
socket.write(headers.concat('\r\n').join('\r\n'));
socket.removeListener('error', socketOnError);
ws.setSocket(socket, head, {
maxPayload: this.options.maxPayload,
skipUTF8Validation: this.options.skipUTF8Validation
});
if (this.clients) {
this.clients.add(ws);
ws.on('close', () => {
this.clients.delete(ws);
if (this._shouldEmitClose && !this.clients.size) {
process.nextTick(emitClose, this);
}
});
}
cb(ws, req);
}
}
module.exports = WebSocketServer;
/**
* Add event listeners on an `EventEmitter` using a map of <event, listener>
* pairs.
*
* @param {EventEmitter} server The event emitter
* @param {Object.<String, Function>} map The listeners to add
* @return {Function} A function that will remove the added listeners when
* called
* @private
*/
function addListeners(server, map) {
for (const event of Object.keys(map)) server.on(event, map[event]);
return function removeListeners() {
for (const event of Object.keys(map)) {
server.removeListener(event, map[event]);
}
};
}
/**
* Emit a `'close'` event on an `EventEmitter`.
*
* @param {EventEmitter} server The event emitter
* @private
*/
function emitClose(server) {
server._state = CLOSED;
server.emit('close');
}
/**
* Handle premature socket errors.
*
* @private
*/
function socketOnError() {
this.destroy();
}
/**
* Close the connection when preconditions are not fulfilled.
*
* @param {(net.Socket|tls.Socket)} socket The socket of the upgrade request
* @param {Number} code The HTTP response status code
* @param {String} [message] The HTTP response body
* @param {Object} [headers] Additional HTTP response headers
* @private
*/
function abortHandshake(socket, code, message, headers) {
if (socket.writable) {
message = message || http.STATUS_CODES[code];
headers = {
Connection: 'close',
'Content-Type': 'text/html',
'Content-Length': Buffer.byteLength(message),
...headers
};
socket.write(
`HTTP/1.1 ${code} ${http.STATUS_CODES[code]}\r\n` +
Object.keys(headers)
.map((h) => `${h}: ${headers[h]}`)
.join('\r\n') +
'\r\n\r\n' +
message
);
}
socket.removeListener('error', socketOnError);
socket.destroy();
}

1149
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61
mock_ws_server/node_modules/ws/package.json generated vendored Normal file
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{
"name": "ws",
"version": "8.2.3",
"description": "Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js",
"keywords": [
"HyBi",
"Push",
"RFC-6455",
"WebSocket",
"WebSockets",
"real-time"
],
"homepage": "https://github.com/websockets/ws",
"bugs": "https://github.com/websockets/ws/issues",
"repository": "websockets/ws",
"author": "Einar Otto Stangvik <einaros@gmail.com> (http://2x.io)",
"license": "MIT",
"main": "index.js",
"exports": {
"import": "./wrapper.mjs",
"require": "./index.js"
},
"browser": "browser.js",
"engines": {
"node": ">=10.0.0"
},
"files": [
"browser.js",
"index.js",
"lib/*.js",
"wrapper.mjs"
],
"scripts": {
"test": "nyc --reporter=lcov --reporter=text mocha --throw-deprecation test/*.test.js",
"integration": "mocha --throw-deprecation test/*.integration.js",
"lint": "eslint --ignore-path .gitignore . && prettier --check --ignore-path .gitignore \"**/*.{json,md,yaml,yml}\""
},
"peerDependencies": {
"bufferutil": "^4.0.1",
"utf-8-validate": "^5.0.2"
},
"peerDependenciesMeta": {
"bufferutil": {
"optional": true
},
"utf-8-validate": {
"optional": true
}
},
"devDependencies": {
"benchmark": "^2.1.4",
"bufferutil": "^4.0.1",
"eslint": "^7.2.0",
"eslint-config-prettier": "^8.1.0",
"eslint-plugin-prettier": "^4.0.0",
"mocha": "^8.4.0",
"nyc": "^15.0.0",
"prettier": "^2.0.5",
"utf-8-validate": "^5.0.2"
}
}

8
mock_ws_server/node_modules/ws/wrapper.mjs generated vendored Normal file
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import createWebSocketStream from './lib/stream.js';
import Receiver from './lib/receiver.js';
import Sender from './lib/sender.js';
import WebSocket from './lib/websocket.js';
import WebSocketServer from './lib/websocket-server.js';
export { createWebSocketStream, Receiver, Sender, WebSocket, WebSocketServer };
export default WebSocket;

43
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{
"name": "mock_ws_server",
"version": "1.0.0",
"lockfileVersion": 2,
"requires": true,
"packages": {
"": {
"version": "1.0.0",
"license": "ISC",
"dependencies": {
"ws": "^8.2.3"
}
},
"node_modules/ws": {
"version": "8.2.3",
"resolved": "https://registry.npmjs.org/ws/-/ws-8.2.3.tgz",
"integrity": "sha512-wBuoj1BDpC6ZQ1B7DWQBYVLphPWkm8i9Y0/3YdHjHKHiohOJ1ws+3OccDWtH+PoC9DZD5WOTrJvNbWvjS6JWaA==",
"engines": {
"node": ">=10.0.0"
},
"peerDependencies": {
"bufferutil": "^4.0.1",
"utf-8-validate": "^5.0.2"
},
"peerDependenciesMeta": {
"bufferutil": {
"optional": true
},
"utf-8-validate": {
"optional": true
}
}
}
},
"dependencies": {
"ws": {
"version": "8.2.3",
"resolved": "https://registry.npmjs.org/ws/-/ws-8.2.3.tgz",
"integrity": "sha512-wBuoj1BDpC6ZQ1B7DWQBYVLphPWkm8i9Y0/3YdHjHKHiohOJ1ws+3OccDWtH+PoC9DZD5WOTrJvNbWvjS6JWaA==",
"requires": {}
}
}
}

15
mock_ws_server/package.json Normal file
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{
"name": "mock_ws_server",
"version": "1.0.0",
"description": "",
"main": "server.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"dependencies": {
"ws": "^8.2.3"
},
"type": "module"
}

35
mock_ws_server/server.js Normal file
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import { WebSocketServer } from 'ws';
const wss = new WebSocketServer({ port: 8080 });
const delay = ms => new Promise(resolve => setTimeout(resolve, ms))
wss.on('connection', function connection(ws) {
console.log("Connection made")
ws.on('message', async function message(data) {
data = JSON.parse(data.toString())
console.log("Message received", data.toString())
if(data.topic == "start_test"){
for (var i = 0; i <= 10; i++) {
await delay(1000);
ws.send(
JSON.stringify(
{
"topic": "data",
"data" :
{
"ts": Date.now(),
"temp_before_radiator": Math.random(),
"temp_after_radiator": Math.random(),
"pressure_before_radiator": Math.random(),
"pressure_after_radiator": Math.random(),
"wind_speed": Math.random()
}
}
)
);
}
ws.send(JSON.stringify({topic: "end_test"}));
}
});
});