From e4450c8417624b71d779cb4f41692538f9165e10 Mon Sep 17 00:00:00 2001
From: sowgro <tpoke.ferrari@gmail.com>
Date: Sat, 2 Sep 2023 19:12:47 -0400
Subject: first commit
---
node_modules/ws/lib/receiver.js | 627 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 627 insertions(+)
create mode 100644 node_modules/ws/lib/receiver.js
(limited to 'node_modules/ws/lib/receiver.js')
diff --git a/node_modules/ws/lib/receiver.js b/node_modules/ws/lib/receiver.js
new file mode 100644
index 0000000..96f572c
--- /dev/null
+++ b/node_modules/ws/lib/receiver.js
@@ -0,0 +1,627 @@
+'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;
+}
--
cgit v1.2.3