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implemented basic client-server communication

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This commit is contained in:
leca
2023-07-31 19:18:21 +03:00
parent 5fc231d445
commit eb425f4400
737 changed files with 96109 additions and 36 deletions
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131
node_modules/ws/lib/buffer-util.js generated vendored Normal file
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'use strict';
const { EMPTY_BUFFER } = require('./constants');
const FastBuffer = Buffer[Symbol.species];
/**
* 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 new FastBuffer(target.buffer, target.byteOffset, 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.length === buf.buffer.byteLength) {
return buf.buffer;
}
return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.length);
}
/**
* 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 = new FastBuffer(data);
} else if (ArrayBuffer.isView(data)) {
buf = new FastBuffer(data.buffer, data.byteOffset, data.byteLength);
} else {
buf = Buffer.from(data);
toBuffer.readOnly = false;
}
return buf;
}
module.exports = {
concat,
mask: _mask,
toArrayBuffer,
toBuffer,
unmask: _unmask
};
/* istanbul ignore else */
if (!process.env.WS_NO_BUFFER_UTIL) {
try {
const bufferUtil = require('bufferutil');
module.exports.mask = function (source, mask, output, offset, length) {
if (length < 48) _mask(source, mask, output, offset, length);
else bufferUtil.mask(source, mask, output, offset, length);
};
module.exports.unmask = function (buffer, mask) {
if (buffer.length < 32) _unmask(buffer, mask);
else bufferUtil.unmask(buffer, mask);
};
} catch (e) {
// Continue regardless of the error.
}
}

12
node_modules/ws/lib/constants.js generated vendored Normal file
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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: () => {}
};

292
node_modules/ws/lib/event-target.js generated vendored Normal file
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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|Object)} handler 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, handler, options = {}) {
for (const listener of this.listeners(type)) {
if (
!options[kForOnEventAttribute] &&
listener[kListener] === handler &&
!listener[kForOnEventAttribute]
) {
return;
}
}
let wrapper;
if (type === 'message') {
wrapper = function onMessage(data, isBinary) {
const event = new MessageEvent('message', {
data: isBinary ? data : data.toString()
});
event[kTarget] = this;
callListener(handler, 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;
callListener(handler, this, event);
};
} else if (type === 'error') {
wrapper = function onError(error) {
const event = new ErrorEvent('error', {
error,
message: error.message
});
event[kTarget] = this;
callListener(handler, this, event);
};
} else if (type === 'open') {
wrapper = function onOpen() {
const event = new Event('open');
event[kTarget] = this;
callListener(handler, this, event);
};
} else {
return;
}
wrapper[kForOnEventAttribute] = !!options[kForOnEventAttribute];
wrapper[kListener] = handler;
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|Object)} 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
};
/**
* Call an event listener
*
* @param {(Function|Object)} listener The listener to call
* @param {*} thisArg The value to use as `this`` when calling the listener
* @param {Event} event The event to pass to the listener
* @private
*/
function callListener(listener, thisArg, event) {
if (typeof listener === 'object' && listener.handleEvent) {
listener.handleEvent.call(listener, event);
} else {
listener.call(thisArg, event);
}
}

203
node_modules/ws/lib/extension.js generated vendored Normal file
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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 };

55
node_modules/ws/lib/limiter.js generated vendored Normal file
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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;

514
node_modules/ws/lib/permessage-deflate.js generated vendored Normal file
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'use strict';
const zlib = require('zlib');
const bufferUtil = require('./buffer-util');
const Limiter = require('./limiter');
const { kStatusCode } = require('./constants');
const FastBuffer = Buffer[Symbol.species];
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|String)} 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|String)} 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 = `${endpoint}_max_window_bits`;
const windowBits =
typeof this.params[key] !== 'number'
? zlib.Z_DEFAULT_WINDOWBITS
: this.params[key];
this._deflate = zlib.createDeflateRaw({
...this._options.zlibDeflateOptions,
windowBits
});
this._deflate[kTotalLength] = 0;
this._deflate[kBuffers] = [];
this._deflate.on('data', deflateOnData);
}
this._deflate[kCallback] = callback;
this._deflate.write(data);
this._deflate.flush(zlib.Z_SYNC_FLUSH, () => {
if (!this._deflate) {
//
// The deflate stream was closed while data was being processed.
//
return;
}
let data = bufferUtil.concat(
this._deflate[kBuffers],
this._deflate[kTotalLength]
);
if (fin) {
data = new FastBuffer(data.buffer, data.byteOffset, data.length - 4);
}
//
// Ensure that the callback will not be called again in
// `PerMessageDeflate#cleanup()`.
//
this._deflate[kCallback] = null;
this._deflate[kTotalLength] = 0;
this._deflate[kBuffers] = [];
if (fin && this.params[`${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);
}

627
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 FastBuffer = Buffer[Symbol.species];
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] = new FastBuffer(
buf.buffer,
buf.byteOffset + n,
buf.length - n
);
return new FastBuffer(buf.buffer, buf.byteOffset, 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] = new FastBuffer(
buf.buffer,
buf.byteOffset + n,
buf.length - 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._opcode === 0x08 && this._payloadLength === 1)
) {
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 &&
(this._mask[0] | this._mask[1] | this._mask[2] | this._mask[3]) !== 0
) {
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 {
const code = data.readUInt16BE(0);
if (!isValidStatusCode(code)) {
return error(
RangeError,
`invalid status code ${code}`,
true,
1002,
'WS_ERR_INVALID_CLOSE_CODE'
);
}
const buf = new FastBuffer(
data.buffer,
data.byteOffset + 2,
data.length - 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;
}

478
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 kByteLength = Symbol('kByteLength');
const maskBuffer = 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
* @param {Function} [generateMask] The function used to generate the masking
* key
*/
constructor(socket, extensions, generateMask) {
this._extensions = extensions || {};
if (generateMask) {
this._generateMask = generateMask;
this._maskBuffer = Buffer.alloc(4);
}
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|String)} 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 {Function} [options.generateMask] The function used to generate the
* masking key
* @param {Boolean} [options.mask=false] Specifies whether or not to mask
* `data`
* @param {Buffer} [options.maskBuffer] The buffer used to store the masking
* key
* @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|String)[]} The framed data
* @public
*/
static frame(data, options) {
let mask;
let merge = false;
let offset = 2;
let skipMasking = false;
if (options.mask) {
mask = options.maskBuffer || maskBuffer;
if (options.generateMask) {
options.generateMask(mask);
} else {
randomFillSync(mask, 0, 4);
}
skipMasking = (mask[0] | mask[1] | mask[2] | mask[3]) === 0;
offset = 6;
}
let dataLength;
if (typeof data === 'string') {
if (
(!options.mask || skipMasking) &&
options[kByteLength] !== undefined
) {
dataLength = options[kByteLength];
} else {
data = Buffer.from(data);
dataLength = data.length;
}
} else {
dataLength = data.length;
merge = options.mask && options.readOnly && !skipMasking;
}
let payloadLength = dataLength;
if (dataLength >= 65536) {
offset += 8;
payloadLength = 127;
} else if (dataLength > 125) {
offset += 2;
payloadLength = 126;
}
const target = Buffer.allocUnsafe(merge ? dataLength + 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(dataLength, 2);
} else if (payloadLength === 127) {
target[2] = target[3] = 0;
target.writeUIntBE(dataLength, 4, 6);
}
if (!options.mask) return [target, data];
target[1] |= 0x80;
target[offset - 4] = mask[0];
target[offset - 3] = mask[1];
target[offset - 2] = mask[2];
target[offset - 1] = mask[3];
if (skipMasking) return [target, data];
if (merge) {
applyMask(data, mask, target, offset, dataLength);
return [target];
}
applyMask(data, mask, data, 0, dataLength);
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);
}
}
const options = {
[kByteLength]: buf.length,
fin: true,
generateMask: this._generateMask,
mask,
maskBuffer: this._maskBuffer,
opcode: 0x08,
readOnly: false,
rsv1: false
};
if (this._deflating) {
this.enqueue([this.dispatch, buf, false, options, cb]);
} else {
this.sendFrame(Sender.frame(buf, options), 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) {
let byteLength;
let readOnly;
if (typeof data === 'string') {
byteLength = Buffer.byteLength(data);
readOnly = false;
} else {
data = toBuffer(data);
byteLength = data.length;
readOnly = toBuffer.readOnly;
}
if (byteLength > 125) {
throw new RangeError('The data size must not be greater than 125 bytes');
}
const options = {
[kByteLength]: byteLength,
fin: true,
generateMask: this._generateMask,
mask,
maskBuffer: this._maskBuffer,
opcode: 0x09,
readOnly,
rsv1: false
};
if (this._deflating) {
this.enqueue([this.dispatch, data, false, options, cb]);
} else {
this.sendFrame(Sender.frame(data, options), 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) {
let byteLength;
let readOnly;
if (typeof data === 'string') {
byteLength = Buffer.byteLength(data);
readOnly = false;
} else {
data = toBuffer(data);
byteLength = data.length;
readOnly = toBuffer.readOnly;
}
if (byteLength > 125) {
throw new RangeError('The data size must not be greater than 125 bytes');
}
const options = {
[kByteLength]: byteLength,
fin: true,
generateMask: this._generateMask,
mask,
maskBuffer: this._maskBuffer,
opcode: 0x0a,
readOnly,
rsv1: false
};
if (this._deflating) {
this.enqueue([this.dispatch, data, false, options, cb]);
} else {
this.sendFrame(Sender.frame(data, options), 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 perMessageDeflate = this._extensions[PerMessageDeflate.extensionName];
let opcode = options.binary ? 2 : 1;
let rsv1 = options.compress;
let byteLength;
let readOnly;
if (typeof data === 'string') {
byteLength = Buffer.byteLength(data);
readOnly = false;
} else {
data = toBuffer(data);
byteLength = data.length;
readOnly = toBuffer.readOnly;
}
if (this._firstFragment) {
this._firstFragment = false;
if (
rsv1 &&
perMessageDeflate &&
perMessageDeflate.params[
perMessageDeflate._isServer
? 'server_no_context_takeover'
: 'client_no_context_takeover'
]
) {
rsv1 = byteLength >= perMessageDeflate._threshold;
}
this._compress = rsv1;
} else {
rsv1 = false;
opcode = 0;
}
if (options.fin) this._firstFragment = true;
if (perMessageDeflate) {
const opts = {
[kByteLength]: byteLength,
fin: options.fin,
generateMask: this._generateMask,
mask: options.mask,
maskBuffer: this._maskBuffer,
opcode,
readOnly,
rsv1
};
if (this._deflating) {
this.enqueue([this.dispatch, data, this._compress, opts, cb]);
} else {
this.dispatch(data, this._compress, opts, cb);
}
} else {
this.sendFrame(
Sender.frame(data, {
[kByteLength]: byteLength,
fin: options.fin,
generateMask: this._generateMask,
mask: options.mask,
maskBuffer: this._maskBuffer,
opcode,
readOnly,
rsv1: false
}),
cb
);
}
}
/**
* Dispatches a message.
*
* @param {(Buffer|String)} data The message to send
* @param {Boolean} [compress=false] Specifies whether or not to compress
* `data`
* @param {Object} options Options object
* @param {Boolean} [options.fin=false] Specifies whether or not to set the
* FIN bit
* @param {Function} [options.generateMask] The function used to generate the
* masking key
* @param {Boolean} [options.mask=false] Specifies whether or not to mask
* `data`
* @param {Buffer} [options.maskBuffer] The buffer used to store the masking
* key
* @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
* @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 += options[kByteLength];
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 params = this._queue[i];
const callback = params[params.length - 1];
if (typeof callback === 'function') callback(err);
}
return;
}
this._bufferedBytes -= options[kByteLength];
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[3][kByteLength];
Reflect.apply(params[0], this, params.slice(1));
}
}
/**
* Enqueues a send operation.
*
* @param {Array} params Send operation parameters.
* @private
*/
enqueue(params) {
this._bufferedBytes += params[3][kByteLength];
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;

159
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 terminateOnDestroy = true;
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)) ws.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.isPaused) ws.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;

62
node_modules/ws/lib/subprotocol.js generated vendored Normal file
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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 };

130
node_modules/ws/lib/validation.js generated vendored Normal file
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'use strict';
const { isUtf8 } = require('buffer');
//
// 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;
}
module.exports = {
isValidStatusCode,
isValidUTF8: _isValidUTF8,
tokenChars
};
if (isUtf8) {
module.exports.isValidUTF8 = function (buf) {
return buf.length < 24 ? _isValidUTF8(buf) : isUtf8(buf);
};
} /* istanbul ignore else */ else if (!process.env.WS_NO_UTF_8_VALIDATE) {
try {
const isValidUTF8 = require('utf-8-validate');
module.exports.isValidUTF8 = function (buf) {
return buf.length < 32 ? _isValidUTF8(buf) : isValidUTF8(buf);
};
} catch (e) {
// Continue regardless of the error.
}
}

535
node_modules/ws/lib/websocket-server.js generated vendored Normal file
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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} [options.WebSocket=WebSocket] Specifies the `WebSocket`
* class to use. It must be the `WebSocket` class or class that extends it
* @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,
WebSocket,
...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'];
const version = +req.headers['sec-websocket-version'];
if (req.method !== 'GET') {
const message = 'Invalid HTTP method';
abortHandshakeOrEmitwsClientError(this, req, socket, 405, message);
return;
}
if (req.headers.upgrade.toLowerCase() !== 'websocket') {
const message = 'Invalid Upgrade header';
abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);
return;
}
if (!key || !keyRegex.test(key)) {
const message = 'Missing or invalid Sec-WebSocket-Key header';
abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);
return;
}
if (version !== 8 && version !== 13) {
const message = 'Missing or invalid Sec-WebSocket-Version header';
abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);
return;
}
if (!this.shouldHandle(req)) {
abortHandshake(socket, 400);
return;
}
const secWebSocketProtocol = req.headers['sec-websocket-protocol'];
let protocols = new Set();
if (secWebSocketProtocol !== undefined) {
try {
protocols = subprotocol.parse(secWebSocketProtocol);
} catch (err) {
const message = 'Invalid Sec-WebSocket-Protocol header';
abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);
return;
}
}
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) {
const message =
'Invalid or unacceptable Sec-WebSocket-Extensions header';
abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);
return;
}
}
//
// 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 this.options.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 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) {
//
// The socket is writable unless the user destroyed or ended it before calling
// `server.handleUpgrade()` or in the `verifyClient` function, which is a user
// error. Handling this does not make much sense as the worst that can happen
// is that some of the data written by the user might be discarded due to the
// call to `socket.end()` below, which triggers an `'error'` event that in
// turn causes the socket to be destroyed.
//
message = message || http.STATUS_CODES[code];
headers = {
Connection: 'close',
'Content-Type': 'text/html',
'Content-Length': Buffer.byteLength(message),
...headers
};
socket.once('finish', socket.destroy);
socket.end(
`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
);
}
/**
* Emit a `'wsClientError'` event on a `WebSocketServer` if there is at least
* one listener for it, otherwise call `abortHandshake()`.
*
* @param {WebSocketServer} server The WebSocket server
* @param {http.IncomingMessage} req The request object
* @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
* @private
*/
function abortHandshakeOrEmitwsClientError(server, req, socket, code, message) {
if (server.listenerCount('wsClientError')) {
const err = new Error(message);
Error.captureStackTrace(err, abortHandshakeOrEmitwsClientError);
server.emit('wsClientError', err, socket, req);
} else {
abortHandshake(socket, code, message);
}
}

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