1 line
48 KiB
JSON
1 line
48 KiB
JSON
{"ast":null,"code":"'use strict';\n\nconst {\n Writable\n} = require('stream');\nconst PerMessageDeflate = require('./permessage-deflate');\nconst {\n BINARY_TYPES,\n EMPTY_BUFFER,\n kStatusCode,\n kWebSocket\n} = require('./constants');\nconst {\n concat,\n toArrayBuffer,\n unmask\n} = require('./buffer-util');\nconst {\n isValidStatusCode,\n isValidUTF8\n} = require('./validation');\nconst FastBuffer = Buffer[Symbol.species];\nconst GET_INFO = 0;\nconst GET_PAYLOAD_LENGTH_16 = 1;\nconst GET_PAYLOAD_LENGTH_64 = 2;\nconst GET_MASK = 3;\nconst GET_DATA = 4;\nconst INFLATING = 5;\nconst DEFER_EVENT = 6;\n\n/**\n * HyBi Receiver implementation.\n *\n * @extends Writable\n */\nclass Receiver extends Writable {\n /**\n * Creates a Receiver instance.\n *\n * @param {Object} [options] Options object\n * @param {Boolean} [options.allowSynchronousEvents=true] Specifies whether\n * any of the `'message'`, `'ping'`, and `'pong'` events can be emitted\n * multiple times in the same tick\n * @param {String} [options.binaryType=nodebuffer] The type for binary data\n * @param {Object} [options.extensions] An object containing the negotiated\n * extensions\n * @param {Boolean} [options.isServer=false] Specifies whether to operate in\n * client or server mode\n * @param {Number} [options.maxPayload=0] The maximum allowed message length\n * @param {Boolean} [options.skipUTF8Validation=false] Specifies whether or\n * not to skip UTF-8 validation for text and close messages\n */\n constructor(options = {}) {\n super();\n this._allowSynchronousEvents = options.allowSynchronousEvents !== undefined ? options.allowSynchronousEvents : true;\n this._binaryType = options.binaryType || BINARY_TYPES[0];\n this._extensions = options.extensions || {};\n this._isServer = !!options.isServer;\n this._maxPayload = options.maxPayload | 0;\n this._skipUTF8Validation = !!options.skipUTF8Validation;\n this[kWebSocket] = undefined;\n this._bufferedBytes = 0;\n this._buffers = [];\n this._compressed = false;\n this._payloadLength = 0;\n this._mask = undefined;\n this._fragmented = 0;\n this._masked = false;\n this._fin = false;\n this._opcode = 0;\n this._totalPayloadLength = 0;\n this._messageLength = 0;\n this._fragments = [];\n this._errored = false;\n this._loop = false;\n this._state = GET_INFO;\n }\n\n /**\n * Implements `Writable.prototype._write()`.\n *\n * @param {Buffer} chunk The chunk of data to write\n * @param {String} encoding The character encoding of `chunk`\n * @param {Function} cb Callback\n * @private\n */\n _write(chunk, encoding, cb) {\n if (this._opcode === 0x08 && this._state == GET_INFO) return cb();\n this._bufferedBytes += chunk.length;\n this._buffers.push(chunk);\n this.startLoop(cb);\n }\n\n /**\n * Consumes `n` bytes from the buffered data.\n *\n * @param {Number} n The number of bytes to consume\n * @return {Buffer} The consumed bytes\n * @private\n */\n consume(n) {\n this._bufferedBytes -= n;\n if (n === this._buffers[0].length) return this._buffers.shift();\n if (n < this._buffers[0].length) {\n const buf = this._buffers[0];\n this._buffers[0] = new FastBuffer(buf.buffer, buf.byteOffset + n, buf.length - n);\n return new FastBuffer(buf.buffer, buf.byteOffset, n);\n }\n const dst = Buffer.allocUnsafe(n);\n do {\n const buf = this._buffers[0];\n const offset = dst.length - n;\n if (n >= buf.length) {\n dst.set(this._buffers.shift(), offset);\n } else {\n dst.set(new Uint8Array(buf.buffer, buf.byteOffset, n), offset);\n this._buffers[0] = new FastBuffer(buf.buffer, buf.byteOffset + n, buf.length - n);\n }\n n -= buf.length;\n } while (n > 0);\n return dst;\n }\n\n /**\n * Starts the parsing loop.\n *\n * @param {Function} cb Callback\n * @private\n */\n startLoop(cb) {\n this._loop = true;\n do {\n switch (this._state) {\n case GET_INFO:\n this.getInfo(cb);\n break;\n case GET_PAYLOAD_LENGTH_16:\n this.getPayloadLength16(cb);\n break;\n case GET_PAYLOAD_LENGTH_64:\n this.getPayloadLength64(cb);\n break;\n case GET_MASK:\n this.getMask();\n break;\n case GET_DATA:\n this.getData(cb);\n break;\n case INFLATING:\n case DEFER_EVENT:\n this._loop = false;\n return;\n }\n } while (this._loop);\n if (!this._errored) cb();\n }\n\n /**\n * Reads the first two bytes of a frame.\n *\n * @param {Function} cb Callback\n * @private\n */\n getInfo(cb) {\n if (this._bufferedBytes < 2) {\n this._loop = false;\n return;\n }\n const buf = this.consume(2);\n if ((buf[0] & 0x30) !== 0x00) {\n const error = this.createError(RangeError, 'RSV2 and RSV3 must be clear', true, 1002, 'WS_ERR_UNEXPECTED_RSV_2_3');\n cb(error);\n return;\n }\n const compressed = (buf[0] & 0x40) === 0x40;\n if (compressed && !this._extensions[PerMessageDeflate.extensionName]) {\n const error = this.createError(RangeError, 'RSV1 must be clear', true, 1002, 'WS_ERR_UNEXPECTED_RSV_1');\n cb(error);\n return;\n }\n this._fin = (buf[0] & 0x80) === 0x80;\n this._opcode = buf[0] & 0x0f;\n this._payloadLength = buf[1] & 0x7f;\n if (this._opcode === 0x00) {\n if (compressed) {\n const error = this.createError(RangeError, 'RSV1 must be clear', true, 1002, 'WS_ERR_UNEXPECTED_RSV_1');\n cb(error);\n return;\n }\n if (!this._fragmented) {\n const error = this.createError(RangeError, 'invalid opcode 0', true, 1002, 'WS_ERR_INVALID_OPCODE');\n cb(error);\n return;\n }\n this._opcode = this._fragmented;\n } else if (this._opcode === 0x01 || this._opcode === 0x02) {\n if (this._fragmented) {\n const error = this.createError(RangeError, `invalid opcode ${this._opcode}`, true, 1002, 'WS_ERR_INVALID_OPCODE');\n cb(error);\n return;\n }\n this._compressed = compressed;\n } else if (this._opcode > 0x07 && this._opcode < 0x0b) {\n if (!this._fin) {\n const error = this.createError(RangeError, 'FIN must be set', true, 1002, 'WS_ERR_EXPECTED_FIN');\n cb(error);\n return;\n }\n if (compressed) {\n const error = this.createError(RangeError, 'RSV1 must be clear', true, 1002, 'WS_ERR_UNEXPECTED_RSV_1');\n cb(error);\n return;\n }\n if (this._payloadLength > 0x7d || this._opcode === 0x08 && this._payloadLength === 1) {\n const error = this.createError(RangeError, `invalid payload length ${this._payloadLength}`, true, 1002, 'WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH');\n cb(error);\n return;\n }\n } else {\n const error = this.createError(RangeError, `invalid opcode ${this._opcode}`, true, 1002, 'WS_ERR_INVALID_OPCODE');\n cb(error);\n return;\n }\n if (!this._fin && !this._fragmented) this._fragmented = this._opcode;\n this._masked = (buf[1] & 0x80) === 0x80;\n if (this._isServer) {\n if (!this._masked) {\n const error = this.createError(RangeError, 'MASK must be set', true, 1002, 'WS_ERR_EXPECTED_MASK');\n cb(error);\n return;\n }\n } else if (this._masked) {\n const error = this.createError(RangeError, 'MASK must be clear', true, 1002, 'WS_ERR_UNEXPECTED_MASK');\n cb(error);\n return;\n }\n if (this._payloadLength === 126) this._state = GET_PAYLOAD_LENGTH_16;else if (this._payloadLength === 127) this._state = GET_PAYLOAD_LENGTH_64;else this.haveLength(cb);\n }\n\n /**\n * Gets extended payload length (7+16).\n *\n * @param {Function} cb Callback\n * @private\n */\n getPayloadLength16(cb) {\n if (this._bufferedBytes < 2) {\n this._loop = false;\n return;\n }\n this._payloadLength = this.consume(2).readUInt16BE(0);\n this.haveLength(cb);\n }\n\n /**\n * Gets extended payload length (7+64).\n *\n * @param {Function} cb Callback\n * @private\n */\n getPayloadLength64(cb) {\n if (this._bufferedBytes < 8) {\n this._loop = false;\n return;\n }\n const buf = this.consume(8);\n const num = buf.readUInt32BE(0);\n\n //\n // The maximum safe integer in JavaScript is 2^53 - 1. An error is returned\n // if payload length is greater than this number.\n //\n if (num > Math.pow(2, 53 - 32) - 1) {\n const error = this.createError(RangeError, 'Unsupported WebSocket frame: payload length > 2^53 - 1', false, 1009, 'WS_ERR_UNSUPPORTED_DATA_PAYLOAD_LENGTH');\n cb(error);\n return;\n }\n this._payloadLength = num * Math.pow(2, 32) + buf.readUInt32BE(4);\n this.haveLength(cb);\n }\n\n /**\n * Payload length has been read.\n *\n * @param {Function} cb Callback\n * @private\n */\n haveLength(cb) {\n if (this._payloadLength && this._opcode < 0x08) {\n this._totalPayloadLength += this._payloadLength;\n if (this._totalPayloadLength > this._maxPayload && this._maxPayload > 0) {\n const error = this.createError(RangeError, 'Max payload size exceeded', false, 1009, 'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH');\n cb(error);\n return;\n }\n }\n if (this._masked) this._state = GET_MASK;else this._state = GET_DATA;\n }\n\n /**\n * Reads mask bytes.\n *\n * @private\n */\n getMask() {\n if (this._bufferedBytes < 4) {\n this._loop = false;\n return;\n }\n this._mask = this.consume(4);\n this._state = GET_DATA;\n }\n\n /**\n * Reads data bytes.\n *\n * @param {Function} cb Callback\n * @private\n */\n getData(cb) {\n let data = EMPTY_BUFFER;\n if (this._payloadLength) {\n if (this._bufferedBytes < this._payloadLength) {\n this._loop = false;\n return;\n }\n data = this.consume(this._payloadLength);\n if (this._masked && (this._mask[0] | this._mask[1] | this._mask[2] | this._mask[3]) !== 0) {\n unmask(data, this._mask);\n }\n }\n if (this._opcode > 0x07) {\n this.controlMessage(data, cb);\n return;\n }\n if (this._compressed) {\n this._state = INFLATING;\n this.decompress(data, cb);\n return;\n }\n if (data.length) {\n //\n // This message is not compressed so its length is the sum of the payload\n // length of all fragments.\n //\n this._messageLength = this._totalPayloadLength;\n this._fragments.push(data);\n }\n this.dataMessage(cb);\n }\n\n /**\n * Decompresses data.\n *\n * @param {Buffer} data Compressed data\n * @param {Function} cb Callback\n * @private\n */\n decompress(data, cb) {\n const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName];\n perMessageDeflate.decompress(data, this._fin, (err, buf) => {\n if (err) return cb(err);\n if (buf.length) {\n this._messageLength += buf.length;\n if (this._messageLength > this._maxPayload && this._maxPayload > 0) {\n const error = this.createError(RangeError, 'Max payload size exceeded', false, 1009, 'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH');\n cb(error);\n return;\n }\n this._fragments.push(buf);\n }\n this.dataMessage(cb);\n if (this._state === GET_INFO) this.startLoop(cb);\n });\n }\n\n /**\n * Handles a data message.\n *\n * @param {Function} cb Callback\n * @private\n */\n dataMessage(cb) {\n if (!this._fin) {\n this._state = GET_INFO;\n return;\n }\n const messageLength = this._messageLength;\n const fragments = this._fragments;\n this._totalPayloadLength = 0;\n this._messageLength = 0;\n this._fragmented = 0;\n this._fragments = [];\n if (this._opcode === 2) {\n let data;\n if (this._binaryType === 'nodebuffer') {\n data = concat(fragments, messageLength);\n } else if (this._binaryType === 'arraybuffer') {\n data = toArrayBuffer(concat(fragments, messageLength));\n } else if (this._binaryType === 'blob') {\n data = new Blob(fragments);\n } else {\n data = fragments;\n }\n if (this._allowSynchronousEvents) {\n this.emit('message', data, true);\n this._state = GET_INFO;\n } else {\n this._state = DEFER_EVENT;\n setImmediate(() => {\n this.emit('message', data, true);\n this._state = GET_INFO;\n this.startLoop(cb);\n });\n }\n } else {\n const buf = concat(fragments, messageLength);\n if (!this._skipUTF8Validation && !isValidUTF8(buf)) {\n const error = this.createError(Error, 'invalid UTF-8 sequence', true, 1007, 'WS_ERR_INVALID_UTF8');\n cb(error);\n return;\n }\n if (this._state === INFLATING || this._allowSynchronousEvents) {\n this.emit('message', buf, false);\n this._state = GET_INFO;\n } else {\n this._state = DEFER_EVENT;\n setImmediate(() => {\n this.emit('message', buf, false);\n this._state = GET_INFO;\n this.startLoop(cb);\n });\n }\n }\n }\n\n /**\n * Handles a control message.\n *\n * @param {Buffer} data Data to handle\n * @return {(Error|RangeError|undefined)} A possible error\n * @private\n */\n controlMessage(data, cb) {\n if (this._opcode === 0x08) {\n if (data.length === 0) {\n this._loop = false;\n this.emit('conclude', 1005, EMPTY_BUFFER);\n this.end();\n } else {\n const code = data.readUInt16BE(0);\n if (!isValidStatusCode(code)) {\n const error = this.createError(RangeError, `invalid status code ${code}`, true, 1002, 'WS_ERR_INVALID_CLOSE_CODE');\n cb(error);\n return;\n }\n const buf = new FastBuffer(data.buffer, data.byteOffset + 2, data.length - 2);\n if (!this._skipUTF8Validation && !isValidUTF8(buf)) {\n const error = this.createError(Error, 'invalid UTF-8 sequence', true, 1007, 'WS_ERR_INVALID_UTF8');\n cb(error);\n return;\n }\n this._loop = false;\n this.emit('conclude', code, buf);\n this.end();\n }\n this._state = GET_INFO;\n return;\n }\n if (this._allowSynchronousEvents) {\n this.emit(this._opcode === 0x09 ? 'ping' : 'pong', data);\n this._state = GET_INFO;\n } else {\n this._state = DEFER_EVENT;\n setImmediate(() => {\n this.emit(this._opcode === 0x09 ? 'ping' : 'pong', data);\n this._state = GET_INFO;\n this.startLoop(cb);\n });\n }\n }\n\n /**\n * Builds an error object.\n *\n * @param {function(new:Error|RangeError)} ErrorCtor The error constructor\n * @param {String} message The error message\n * @param {Boolean} prefix Specifies whether or not to add a default prefix to\n * `message`\n * @param {Number} statusCode The status code\n * @param {String} errorCode The exposed error code\n * @return {(Error|RangeError)} The error\n * @private\n */\n createError(ErrorCtor, message, prefix, statusCode, errorCode) {\n this._loop = false;\n this._errored = true;\n const err = new ErrorCtor(prefix ? `Invalid WebSocket frame: ${message}` : message);\n Error.captureStackTrace(err, this.createError);\n err.code = errorCode;\n err[kStatusCode] = statusCode;\n return err;\n }\n}\nmodule.exports = Receiver;","map":{"version":3,"names":["Writable","require","PerMessageDeflate","BINARY_TYPES","EMPTY_BUFFER","kStatusCode","kWebSocket","concat","toArrayBuffer","unmask","isValidStatusCode","isValidUTF8","FastBuffer","Buffer","Symbol","species","GET_INFO","GET_PAYLOAD_LENGTH_16","GET_PAYLOAD_LENGTH_64","GET_MASK","GET_DATA","INFLATING","DEFER_EVENT","Receiver","constructor","options","_allowSynchronousEvents","allowSynchronousEvents","undefined","_binaryType","binaryType","_extensions","extensions","_isServer","isServer","_maxPayload","maxPayload","_skipUTF8Validation","skipUTF8Validation","_bufferedBytes","_buffers","_compressed","_payloadLength","_mask","_fragmented","_masked","_fin","_opcode","_totalPayloadLength","_messageLength","_fragments","_errored","_loop","_state","_write","chunk","encoding","cb","length","push","startLoop","consume","n","shift","buf","buffer","byteOffset","dst","allocUnsafe","offset","set","Uint8Array","getInfo","getPayloadLength16","getPayloadLength64","getMask","getData","error","createError","RangeError","compressed","extensionName","haveLength","readUInt16BE","num","readUInt32BE","Math","pow","data","controlMessage","decompress","dataMessage","perMessageDeflate","err","messageLength","fragments","Blob","emit","setImmediate","Error","end","code","ErrorCtor","message","prefix","statusCode","errorCode","captureStackTrace","module","exports"],"sources":["/Users/shoofle/Projects/the-forest/node_modules/@libsql/isomorphic-ws/node_modules/ws/lib/receiver.js"],"sourcesContent":["'use strict';\n\nconst { Writable } = require('stream');\n\nconst PerMessageDeflate = require('./permessage-deflate');\nconst {\n BINARY_TYPES,\n EMPTY_BUFFER,\n kStatusCode,\n kWebSocket\n} = require('./constants');\nconst { concat, toArrayBuffer, unmask } = require('./buffer-util');\nconst { isValidStatusCode, isValidUTF8 } = require('./validation');\n\nconst FastBuffer = Buffer[Symbol.species];\n\nconst GET_INFO = 0;\nconst GET_PAYLOAD_LENGTH_16 = 1;\nconst GET_PAYLOAD_LENGTH_64 = 2;\nconst GET_MASK = 3;\nconst GET_DATA = 4;\nconst INFLATING = 5;\nconst DEFER_EVENT = 6;\n\n/**\n * HyBi Receiver implementation.\n *\n * @extends Writable\n */\nclass Receiver extends Writable {\n /**\n * Creates a Receiver instance.\n *\n * @param {Object} [options] Options object\n * @param {Boolean} [options.allowSynchronousEvents=true] Specifies whether\n * any of the `'message'`, `'ping'`, and `'pong'` events can be emitted\n * multiple times in the same tick\n * @param {String} [options.binaryType=nodebuffer] The type for binary data\n * @param {Object} [options.extensions] An object containing the negotiated\n * extensions\n * @param {Boolean} [options.isServer=false] Specifies whether to operate in\n * client or server mode\n * @param {Number} [options.maxPayload=0] The maximum allowed message length\n * @param {Boolean} [options.skipUTF8Validation=false] Specifies whether or\n * not to skip UTF-8 validation for text and close messages\n */\n constructor(options = {}) {\n super();\n\n this._allowSynchronousEvents =\n options.allowSynchronousEvents !== undefined\n ? options.allowSynchronousEvents\n : true;\n this._binaryType = options.binaryType || BINARY_TYPES[0];\n this._extensions = options.extensions || {};\n this._isServer = !!options.isServer;\n this._maxPayload = options.maxPayload | 0;\n this._skipUTF8Validation = !!options.skipUTF8Validation;\n this[kWebSocket] = undefined;\n\n this._bufferedBytes = 0;\n this._buffers = [];\n\n this._compressed = false;\n this._payloadLength = 0;\n this._mask = undefined;\n this._fragmented = 0;\n this._masked = false;\n this._fin = false;\n this._opcode = 0;\n\n this._totalPayloadLength = 0;\n this._messageLength = 0;\n this._fragments = [];\n\n this._errored = false;\n this._loop = false;\n this._state = GET_INFO;\n }\n\n /**\n * Implements `Writable.prototype._write()`.\n *\n * @param {Buffer} chunk The chunk of data to write\n * @param {String} encoding The character encoding of `chunk`\n * @param {Function} cb Callback\n * @private\n */\n _write(chunk, encoding, cb) {\n if (this._opcode === 0x08 && this._state == GET_INFO) return cb();\n\n this._bufferedBytes += chunk.length;\n this._buffers.push(chunk);\n this.startLoop(cb);\n }\n\n /**\n * Consumes `n` bytes from the buffered data.\n *\n * @param {Number} n The number of bytes to consume\n * @return {Buffer} The consumed bytes\n * @private\n */\n consume(n) {\n this._bufferedBytes -= n;\n\n if (n === this._buffers[0].length) return this._buffers.shift();\n\n if (n < this._buffers[0].length) {\n const buf = this._buffers[0];\n this._buffers[0] = new FastBuffer(\n buf.buffer,\n buf.byteOffset + n,\n buf.length - n\n );\n\n return new FastBuffer(buf.buffer, buf.byteOffset, n);\n }\n\n const dst = Buffer.allocUnsafe(n);\n\n do {\n const buf = this._buffers[0];\n const offset = dst.length - n;\n\n if (n >= buf.length) {\n dst.set(this._buffers.shift(), offset);\n } else {\n dst.set(new Uint8Array(buf.buffer, buf.byteOffset, n), offset);\n this._buffers[0] = new FastBuffer(\n buf.buffer,\n buf.byteOffset + n,\n buf.length - n\n );\n }\n\n n -= buf.length;\n } while (n > 0);\n\n return dst;\n }\n\n /**\n * Starts the parsing loop.\n *\n * @param {Function} cb Callback\n * @private\n */\n startLoop(cb) {\n this._loop = true;\n\n do {\n switch (this._state) {\n case GET_INFO:\n this.getInfo(cb);\n break;\n case GET_PAYLOAD_LENGTH_16:\n this.getPayloadLength16(cb);\n break;\n case GET_PAYLOAD_LENGTH_64:\n this.getPayloadLength64(cb);\n break;\n case GET_MASK:\n this.getMask();\n break;\n case GET_DATA:\n this.getData(cb);\n break;\n case INFLATING:\n case DEFER_EVENT:\n this._loop = false;\n return;\n }\n } while (this._loop);\n\n if (!this._errored) cb();\n }\n\n /**\n * Reads the first two bytes of a frame.\n *\n * @param {Function} cb Callback\n * @private\n */\n getInfo(cb) {\n if (this._bufferedBytes < 2) {\n this._loop = false;\n return;\n }\n\n const buf = this.consume(2);\n\n if ((buf[0] & 0x30) !== 0x00) {\n const error = this.createError(\n RangeError,\n 'RSV2 and RSV3 must be clear',\n true,\n 1002,\n 'WS_ERR_UNEXPECTED_RSV_2_3'\n );\n\n cb(error);\n return;\n }\n\n const compressed = (buf[0] & 0x40) === 0x40;\n\n if (compressed && !this._extensions[PerMessageDeflate.extensionName]) {\n const error = this.createError(\n RangeError,\n 'RSV1 must be clear',\n true,\n 1002,\n 'WS_ERR_UNEXPECTED_RSV_1'\n );\n\n cb(error);\n return;\n }\n\n this._fin = (buf[0] & 0x80) === 0x80;\n this._opcode = buf[0] & 0x0f;\n this._payloadLength = buf[1] & 0x7f;\n\n if (this._opcode === 0x00) {\n if (compressed) {\n const error = this.createError(\n RangeError,\n 'RSV1 must be clear',\n true,\n 1002,\n 'WS_ERR_UNEXPECTED_RSV_1'\n );\n\n cb(error);\n return;\n }\n\n if (!this._fragmented) {\n const error = this.createError(\n RangeError,\n 'invalid opcode 0',\n true,\n 1002,\n 'WS_ERR_INVALID_OPCODE'\n );\n\n cb(error);\n return;\n }\n\n this._opcode = this._fragmented;\n } else if (this._opcode === 0x01 || this._opcode === 0x02) {\n if (this._fragmented) {\n const error = this.createError(\n RangeError,\n `invalid opcode ${this._opcode}`,\n true,\n 1002,\n 'WS_ERR_INVALID_OPCODE'\n );\n\n cb(error);\n return;\n }\n\n this._compressed = compressed;\n } else if (this._opcode > 0x07 && this._opcode < 0x0b) {\n if (!this._fin) {\n const error = this.createError(\n RangeError,\n 'FIN must be set',\n true,\n 1002,\n 'WS_ERR_EXPECTED_FIN'\n );\n\n cb(error);\n return;\n }\n\n if (compressed) {\n const error = this.createError(\n RangeError,\n 'RSV1 must be clear',\n true,\n 1002,\n 'WS_ERR_UNEXPECTED_RSV_1'\n );\n\n cb(error);\n return;\n }\n\n if (\n this._payloadLength > 0x7d ||\n (this._opcode === 0x08 && this._payloadLength === 1)\n ) {\n const error = this.createError(\n RangeError,\n `invalid payload length ${this._payloadLength}`,\n true,\n 1002,\n 'WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH'\n );\n\n cb(error);\n return;\n }\n } else {\n const error = this.createError(\n RangeError,\n `invalid opcode ${this._opcode}`,\n true,\n 1002,\n 'WS_ERR_INVALID_OPCODE'\n );\n\n cb(error);\n return;\n }\n\n if (!this._fin && !this._fragmented) this._fragmented = this._opcode;\n this._masked = (buf[1] & 0x80) === 0x80;\n\n if (this._isServer) {\n if (!this._masked) {\n const error = this.createError(\n RangeError,\n 'MASK must be set',\n true,\n 1002,\n 'WS_ERR_EXPECTED_MASK'\n );\n\n cb(error);\n return;\n }\n } else if (this._masked) {\n const error = this.createError(\n RangeError,\n 'MASK must be clear',\n true,\n 1002,\n 'WS_ERR_UNEXPECTED_MASK'\n );\n\n cb(error);\n return;\n }\n\n if (this._payloadLength === 126) this._state = GET_PAYLOAD_LENGTH_16;\n else if (this._payloadLength === 127) this._state = GET_PAYLOAD_LENGTH_64;\n else this.haveLength(cb);\n }\n\n /**\n * Gets extended payload length (7+16).\n *\n * @param {Function} cb Callback\n * @private\n */\n getPayloadLength16(cb) {\n if (this._bufferedBytes < 2) {\n this._loop = false;\n return;\n }\n\n this._payloadLength = this.consume(2).readUInt16BE(0);\n this.haveLength(cb);\n }\n\n /**\n * Gets extended payload length (7+64).\n *\n * @param {Function} cb Callback\n * @private\n */\n getPayloadLength64(cb) {\n if (this._bufferedBytes < 8) {\n this._loop = false;\n return;\n }\n\n const buf = this.consume(8);\n const num = buf.readUInt32BE(0);\n\n //\n // The maximum safe integer in JavaScript is 2^53 - 1. 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2\n );\n\n if (!this._skipUTF8Validation && !isValidUTF8(buf)) {\n const error = this.createError(\n Error,\n 'invalid UTF-8 sequence',\n true,\n 1007,\n 'WS_ERR_INVALID_UTF8'\n );\n\n cb(error);\n return;\n }\n\n this._loop = false;\n this.emit('conclude', code, buf);\n this.end();\n }\n\n this._state = GET_INFO;\n return;\n }\n\n if (this._allowSynchronousEvents) {\n this.emit(this._opcode === 0x09 ? 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'ping' : 'pong', data);\n this._state = GET_INFO;\n this.startLoop(cb);\n });\n }\n }\n\n /**\n * Builds an error object.\n *\n * @param {function(new:Error|RangeError)} ErrorCtor The error constructor\n * @param {String} message The error message\n * @param {Boolean} prefix Specifies whether or not to add a default prefix to\n * `message`\n * @param {Number} statusCode The status code\n * @param {String} errorCode The exposed error code\n * @return {(Error|RangeError)} The error\n * @private\n */\n createError(ErrorCtor, message, prefix, statusCode, errorCode) {\n this._loop = false;\n this._errored = true;\n\n const err = new ErrorCtor(\n prefix ? `Invalid WebSocket frame: ${message}` : message\n );\n\n Error.captureStackTrace(err, this.createError);\n err.code = errorCode;\n err[kStatusCode] = statusCode;\n return err;\n }\n}\n\nmodule.exports = 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