/** * @author tcode2k16 [tcode2k16@gmail.com] * @copyright Crown Copyright 2018 * @license Apache-2.0 */ import Operation from "../Operation"; import BigNumber from "bignumber.js"; import Utils from "../Utils"; /** * From Base62 operation */ class FromBase62 extends Operation { /** * FromBase62 constructor */ constructor() { super(); this.name = "From Base62"; this.module = "Default"; this.description = "decode base62 string"; this.infoURL = "https://en.wikipedia.org/wiki/List_of_numeral_systems"; this.inputType = "string"; this.outputType = "string"; this.args = []; } /** * @param {string} input * @param {Object[]} args * @returns {string} */ run(input, args) { if (input.length < 1) return ""; const ALPHABET = Utils.expandAlphRange("0-9A-Za-z").join(""); const BN = BigNumber.clone({ ALPHABET }); const re = new RegExp("[^" + ALPHABET.replace(/[[\]\\\-^$]/g, "\\$&") + "]", "g"); input = input.replace(re, ""); const number = new BN(input, 62); return Utils.byteArrayToUtf8(Utils.convertToByteArray(number.toString(16), "Hex")); } } export default FromBase62;