| 1 | import crypto from 'crypto'; |
| 2 | |
| 3 | import { WebSocketCloseEventStatusString } from '../types/WebSocket'; |
| 4 | |
| 5 | export default class Utils { |
| 6 | private constructor() { |
| 7 | // This is intentional |
| 8 | } |
| 9 | |
| 10 | public static logPrefix(prefixString = ''): string { |
| 11 | return new Date().toLocaleString() + prefixString; |
| 12 | } |
| 13 | |
| 14 | public static generateUUID(): string { |
| 15 | return crypto.randomUUID(); |
| 16 | } |
| 17 | |
| 18 | public static validateUUID(uuid: string): boolean { |
| 19 | return /^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$/.test( |
| 20 | uuid |
| 21 | ); |
| 22 | } |
| 23 | |
| 24 | public static async sleep(milliSeconds: number): Promise<NodeJS.Timeout> { |
| 25 | return new Promise((resolve) => setTimeout(resolve as () => void, milliSeconds)); |
| 26 | } |
| 27 | |
| 28 | public static formatDurationMilliSeconds(duration: number): string { |
| 29 | duration = Utils.convertToInt(duration); |
| 30 | const hours = Math.floor(duration / (3600 * 1000)); |
| 31 | const minutes = Math.floor((duration / 1000 - hours * 3600) / 60); |
| 32 | const seconds = duration / 1000 - hours * 3600 - minutes * 60; |
| 33 | let hoursStr = hours.toString(); |
| 34 | let minutesStr = minutes.toString(); |
| 35 | let secondsStr = seconds.toString(); |
| 36 | |
| 37 | if (hours < 10) { |
| 38 | hoursStr = '0' + hours.toString(); |
| 39 | } |
| 40 | if (minutes < 10) { |
| 41 | minutesStr = '0' + minutes.toString(); |
| 42 | } |
| 43 | if (seconds < 10) { |
| 44 | secondsStr = '0' + seconds.toString(); |
| 45 | } |
| 46 | return hoursStr + ':' + minutesStr + ':' + secondsStr.substring(0, 6); |
| 47 | } |
| 48 | |
| 49 | public static formatDurationSeconds(duration: number): string { |
| 50 | return Utils.formatDurationMilliSeconds(duration * 1000); |
| 51 | } |
| 52 | |
| 53 | public static convertToDate(value: unknown): Date { |
| 54 | // Check |
| 55 | if (!value) { |
| 56 | return value as Date; |
| 57 | } |
| 58 | // Check Type |
| 59 | if (!(value instanceof Date)) { |
| 60 | return new Date(value as string); |
| 61 | } |
| 62 | return value; |
| 63 | } |
| 64 | |
| 65 | public static convertToInt(value: unknown): number { |
| 66 | let changedValue: number = value as number; |
| 67 | if (!value) { |
| 68 | return 0; |
| 69 | } |
| 70 | if (Number.isSafeInteger(value)) { |
| 71 | return value as number; |
| 72 | } |
| 73 | // Check |
| 74 | if (Utils.isString(value)) { |
| 75 | // Create Object |
| 76 | changedValue = parseInt(value as string); |
| 77 | } |
| 78 | return changedValue; |
| 79 | } |
| 80 | |
| 81 | public static convertToFloat(value: unknown): number { |
| 82 | let changedValue: number = value as number; |
| 83 | if (!value) { |
| 84 | return 0; |
| 85 | } |
| 86 | // Check |
| 87 | if (Utils.isString(value)) { |
| 88 | // Create Object |
| 89 | changedValue = parseFloat(value as string); |
| 90 | } |
| 91 | return changedValue; |
| 92 | } |
| 93 | |
| 94 | public static convertToBoolean(value: unknown): boolean { |
| 95 | let result = false; |
| 96 | // Check boolean |
| 97 | if (value) { |
| 98 | // Check the type |
| 99 | if (typeof value === 'boolean') { |
| 100 | // Already a boolean |
| 101 | result = value; |
| 102 | } else { |
| 103 | // Convert |
| 104 | result = value === 'true'; |
| 105 | } |
| 106 | } |
| 107 | return result; |
| 108 | } |
| 109 | |
| 110 | public static getRandomFloat(max = Number.MAX_VALUE, min = 0, negative = false): number { |
| 111 | if (max < min || max < 0 || min < 0) { |
| 112 | throw new RangeError('Invalid interval'); |
| 113 | } |
| 114 | const randomPositiveFloat = crypto.randomBytes(4).readUInt32LE() / 0xffffffff; |
| 115 | const sign = negative && randomPositiveFloat < 0.5 ? -1 : 1; |
| 116 | return sign * (randomPositiveFloat * (max - min) + min); |
| 117 | } |
| 118 | |
| 119 | public static getRandomInteger(max = Number.MAX_SAFE_INTEGER, min = 0): number { |
| 120 | if (max < min || max < 0 || min < 0) { |
| 121 | throw new RangeError('Invalid interval'); |
| 122 | } |
| 123 | max = Math.floor(max); |
| 124 | if (!Utils.isNullOrUndefined(min) && min !== 0) { |
| 125 | min = Math.ceil(min); |
| 126 | return Math.floor(Utils.secureRandom() * (max - min + 1)) + min; |
| 127 | } |
| 128 | return Math.floor(Utils.secureRandom() * (max + 1)); |
| 129 | } |
| 130 | |
| 131 | public static roundTo(numberValue: number, scale: number): number { |
| 132 | const roundPower = Math.pow(10, scale); |
| 133 | return Math.round(numberValue * roundPower) / roundPower; |
| 134 | } |
| 135 | |
| 136 | public static truncTo(numberValue: number, scale: number): number { |
| 137 | const truncPower = Math.pow(10, scale); |
| 138 | return Math.trunc(numberValue * truncPower) / truncPower; |
| 139 | } |
| 140 | |
| 141 | public static getRandomFloatRounded(max = Number.MAX_VALUE, min = 0, scale = 2): number { |
| 142 | if (min) { |
| 143 | return Utils.roundTo(Utils.getRandomFloat(max, min), scale); |
| 144 | } |
| 145 | return Utils.roundTo(Utils.getRandomFloat(max), scale); |
| 146 | } |
| 147 | |
| 148 | public static getRandomFloatFluctuatedRounded( |
| 149 | staticValue: number, |
| 150 | fluctuationPercent: number, |
| 151 | scale = 2 |
| 152 | ): number { |
| 153 | if (fluctuationPercent === 0) { |
| 154 | return Utils.roundTo(staticValue, scale); |
| 155 | } |
| 156 | const fluctuationRatio = fluctuationPercent / 100; |
| 157 | return Utils.getRandomFloatRounded( |
| 158 | staticValue * (1 + fluctuationRatio), |
| 159 | staticValue * (1 - fluctuationRatio), |
| 160 | scale |
| 161 | ); |
| 162 | } |
| 163 | |
| 164 | public static cloneObject<T>(object: T): T { |
| 165 | return JSON.parse(JSON.stringify(object)) as T; |
| 166 | } |
| 167 | |
| 168 | public static isIterable<T>(obj: T): boolean { |
| 169 | return obj ? typeof obj[Symbol.iterator] === 'function' : false; |
| 170 | } |
| 171 | |
| 172 | public static isString(value: unknown): boolean { |
| 173 | return typeof value === 'string'; |
| 174 | } |
| 175 | |
| 176 | public static isEmptyString(value: unknown): boolean { |
| 177 | return Utils.isString(value) && (value as string).trim().length === 0; |
| 178 | } |
| 179 | |
| 180 | public static isUndefined(value: unknown): boolean { |
| 181 | return typeof value === 'undefined'; |
| 182 | } |
| 183 | |
| 184 | public static isNullOrUndefined(value: unknown): boolean { |
| 185 | // eslint-disable-next-line eqeqeq, no-eq-null |
| 186 | return value == null ? true : false; |
| 187 | } |
| 188 | |
| 189 | public static isEmptyArray(object: unknown): boolean { |
| 190 | if (!Array.isArray(object)) { |
| 191 | return false; |
| 192 | } |
| 193 | if ((object as unknown[]).length > 0) { |
| 194 | return false; |
| 195 | } |
| 196 | return true; |
| 197 | } |
| 198 | |
| 199 | public static isEmptyObject(obj: object): boolean { |
| 200 | if (obj?.constructor !== Object) { |
| 201 | return false; |
| 202 | } |
| 203 | // Iterates over the keys of an object, if |
| 204 | // any exist, return false. |
| 205 | for (const _ in obj) { |
| 206 | return false; |
| 207 | } |
| 208 | return true; |
| 209 | } |
| 210 | |
| 211 | public static insertAt = (str: string, subStr: string, pos: number): string => |
| 212 | `${str.slice(0, pos)}${subStr}${str.slice(pos)}`; |
| 213 | |
| 214 | /** |
| 215 | * @param [retryNumber=0] |
| 216 | * @returns delay in milliseconds |
| 217 | */ |
| 218 | public static exponentialDelay(retryNumber = 0): number { |
| 219 | const delay = Math.pow(2, retryNumber) * 100; |
| 220 | const randomSum = delay * 0.2 * Utils.secureRandom(); // 0-20% of the delay |
| 221 | return delay + randomSum; |
| 222 | } |
| 223 | |
| 224 | public static async promiseWithTimeout<T>( |
| 225 | promise: Promise<T>, |
| 226 | timeoutMs: number, |
| 227 | timeoutError: Error, |
| 228 | timeoutCallback: () => void = () => { |
| 229 | /* This is intentional */ |
| 230 | } |
| 231 | ): Promise<T> { |
| 232 | // Create a timeout promise that rejects in timeout milliseconds |
| 233 | const timeoutPromise = new Promise<never>((_, reject) => { |
| 234 | setTimeout(() => { |
| 235 | timeoutCallback(); |
| 236 | reject(timeoutError); |
| 237 | }, timeoutMs); |
| 238 | }); |
| 239 | |
| 240 | // Returns a race between timeout promise and the passed promise |
| 241 | return Promise.race<T>([promise, timeoutPromise]); |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * Generate a cryptographically secure random number in the [0,1[ range |
| 246 | * |
| 247 | * @returns |
| 248 | */ |
| 249 | public static secureRandom(): number { |
| 250 | return crypto.randomBytes(4).readUInt32LE() / 0x100000000; |
| 251 | } |
| 252 | |
| 253 | public static JSONStringifyWithMapSupport( |
| 254 | obj: Record<string, unknown> | Record<string, unknown>[], |
| 255 | space?: number |
| 256 | ): string { |
| 257 | return JSON.stringify( |
| 258 | obj, |
| 259 | (key, value: Record<string, unknown>) => { |
| 260 | if (value instanceof Map) { |
| 261 | return { |
| 262 | dataType: 'Map', |
| 263 | value: [...value], |
| 264 | }; |
| 265 | } |
| 266 | return value; |
| 267 | }, |
| 268 | space |
| 269 | ); |
| 270 | } |
| 271 | |
| 272 | /** |
| 273 | * Convert websocket error code to human readable string message |
| 274 | * |
| 275 | * @param code websocket error code |
| 276 | * @returns human readable string message |
| 277 | */ |
| 278 | public static getWebSocketCloseEventStatusString(code: number): string { |
| 279 | if (code >= 0 && code <= 999) { |
| 280 | return '(Unused)'; |
| 281 | } else if (code >= 1016) { |
| 282 | if (code <= 1999) { |
| 283 | return '(For WebSocket standard)'; |
| 284 | } else if (code <= 2999) { |
| 285 | return '(For WebSocket extensions)'; |
| 286 | } else if (code <= 3999) { |
| 287 | return '(For libraries and frameworks)'; |
| 288 | } else if (code <= 4999) { |
| 289 | return '(For applications)'; |
| 290 | } |
| 291 | } |
| 292 | if (!Utils.isUndefined(WebSocketCloseEventStatusString[code])) { |
| 293 | return WebSocketCloseEventStatusString[code] as string; |
| 294 | } |
| 295 | return '(Unknown)'; |
| 296 | } |
| 297 | } |