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