X-Git-Url: https://git.josue.xyz/?p=VSoRC%2F.git;a=blobdiff_plain;f=node_modules%2Fexpress-ws%2Fnode_modules%2Fws%2Flib%2Freceiver.js;fp=node_modules%2Fexpress-ws%2Fnode_modules%2Fws%2Flib%2Freceiver.js;h=81dc0bf8ac3bc594bd3ed8ce22a979de28765ff5;hp=0000000000000000000000000000000000000000;hb=2b1de44527123fab80901384e0f374367500ced8;hpb=e79e4a5a87f3e84f7c1777f10a954453a69bf540 diff --git a/node_modules/express-ws/node_modules/ws/lib/receiver.js b/node_modules/express-ws/node_modules/ws/lib/receiver.js new file mode 100644 index 0000000..81dc0bf --- /dev/null +++ b/node_modules/express-ws/node_modules/ws/lib/receiver.js @@ -0,0 +1,513 @@ +'use strict'; + +const stream = require('stream'); + +const PerMessageDeflate = require('./permessage-deflate'); +const bufferUtil = require('./buffer-util'); +const validation = require('./validation'); +const constants = require('./constants'); + +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 stream.Writable + */ +class Receiver extends stream.Writable { + /** + * Creates a Receiver instance. + * + * @param {String} binaryType The type for binary data + * @param {Object} extensions An object containing the negotiated extensions + * @param {Number} maxPayload The maximum allowed message length + */ + constructor (binaryType, extensions, maxPayload) { + super(); + + this._binaryType = binaryType || constants.BINARY_TYPES[0]; + this[constants.kWebSocket] = undefined; + this._extensions = extensions || {}; + this._maxPayload = maxPayload | 0; + + 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 + */ + _write (chunk, encoding, cb) { + if (this._opcode === 0x08) return cb(); + + this._bufferedBytes += chunk.length; + this._buffers.push(chunk); + this.startLoop(cb); + } + + /** + * Consumes `n` bytes from the buffered data. + * + * @param {Number} n The number of bytes to consume + * @return {Buffer} The consumed bytes + * @private + */ + consume (n) { + this._bufferedBytes -= n; + + if (n === this._buffers[0].length) return this._buffers.shift(); + + if (n < this._buffers[0].length) { + const buf = this._buffers[0]; + this._buffers[0] = buf.slice(n); + return buf.slice(0, n); + } + + const dst = Buffer.allocUnsafe(n); + + do { + const buf = this._buffers[0]; + + if (n >= buf.length) { + this._buffers.shift().copy(dst, dst.length - n); + } else { + buf.copy(dst, dst.length - n, 0, n); + this._buffers[0] = buf.slice(n); + } + + n -= buf.length; + } while (n > 0); + + return dst; + } + + /** + * Starts the parsing loop. + * + * @param {Function} cb Callback + * @private + */ + startLoop (cb) { + var 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); + } + + const compressed = (buf[0] & 0x40) === 0x40; + + if (compressed && !this._extensions[PerMessageDeflate.extensionName]) { + this._loop = false; + return error(RangeError, 'RSV1 must be clear', true, 1002); + } + + 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); + } + + if (!this._fragmented) { + this._loop = false; + return error(RangeError, 'invalid opcode 0', true, 1002); + } + + 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); + } + + 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); + } + + if (compressed) { + this._loop = false; + return error(RangeError, 'RSV1 must be clear', true, 1002); + } + + if (this._payloadLength > 0x7d) { + this._loop = false; + return error( + RangeError, + `invalid payload length ${this._payloadLength}`, + true, + 1002 + ); + } + } else { + this._loop = false; + return error(RangeError, `invalid opcode ${this._opcode}`, true, 1002); + } + + if (!this._fin && !this._fragmented) this._fragmented = this._opcode; + this._masked = (buf[1] & 0x80) === 0x80; + + 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 + ); + } + + 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); + } + } + + 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) { + var data = constants.EMPTY_BUFFER; + + if (this._payloadLength) { + if (this._bufferedBytes < this._payloadLength) { + this._loop = false; + return; + } + + data = this.consume(this._payloadLength); + if (this._masked) bufferUtil.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 lenght 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)); + } + + 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) { + var data; + + if (this._binaryType === 'nodebuffer') { + data = toBuffer(fragments, messageLength); + } else if (this._binaryType === 'arraybuffer') { + data = toArrayBuffer(toBuffer(fragments, messageLength)); + } else { + data = fragments; + } + + this.emit('message', data); + } else { + const buf = toBuffer(fragments, messageLength); + + if (!validation.isValidUTF8(buf)) { + this._loop = false; + return error(Error, 'invalid UTF-8 sequence', true, 1007); + } + + this.emit('message', buf.toString()); + } + } + + 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, ''); + this.end(); + } else if (data.length === 1) { + return error(RangeError, 'invalid payload length 1', true, 1002); + } else { + const code = data.readUInt16BE(0); + + if (!validation.isValidStatusCode(code)) { + return error(RangeError, `invalid status code ${code}`, true, 1002); + } + + const buf = data.slice(2); + + if (!validation.isValidUTF8(buf)) { + return error(Error, 'invalid UTF-8 sequence', true, 1007); + } + + this.emit('conclude', code, buf.toString()); + this.end(); + } + + return; + } + + 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 {(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 + * @return {(Error|RangeError)} The error + * @private + */ +function error (ErrorCtor, message, prefix, statusCode) { + const err = new ErrorCtor( + prefix ? `Invalid WebSocket frame: ${message}` : message + ); + + Error.captureStackTrace(err, error); + err[constants.kStatusCode] = statusCode; + return err; +} + +/** + * Makes a buffer from a list of fragments. + * + * @param {Buffer[]} fragments The list of fragments composing the message + * @param {Number} messageLength The length of the message + * @return {Buffer} + * @private + */ +function toBuffer (fragments, messageLength) { + if (fragments.length === 1) return fragments[0]; + if (fragments.length > 1) return bufferUtil.concat(fragments, messageLength); + return constants.EMPTY_BUFFER; +} + +/** + * Converts a buffer to an `ArrayBuffer`. + * + * @param {Buffer} The buffer to convert + * @return {ArrayBuffer} Converted buffer + */ +function toArrayBuffer (buf) { + if (buf.byteOffset === 0 && buf.byteLength === buf.buffer.byteLength) { + return buf.buffer; + } + + return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength); +}