forked from github/jsotp
lancegin
118 lines
2.5 KiB
JavaScript
118 lines
2.5 KiB
JavaScript
/*
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* @module : Util module to process the datas.
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* @author : Gin (gin.lance.inside@hotmail.com)
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*/
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import { Base32 } from './base32';
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export class Util {
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/*＊
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* Util rjust number with 0
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*
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* @param {num}
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* @type {int}
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* @desc input number
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*
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* @param {n}
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* @type {int}
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* @desc wanted length
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*
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* @return {String}
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*/
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static rjust(num, n) {
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let len = num.toString().length;
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while (len < n) {
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num = "0" + num;
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len++;
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}
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return num;
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}
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/*＊
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* Util rjust array with ""
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*
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* @param {arr}
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* @type {Array}
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* @desc input array
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*
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* @param {n}
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* @type {int}
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* @desc wanted length
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*
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* @return {BYTES}
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*/
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static arr_rjust(arr, n) {
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if (n <= arr.length) {
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arr = arr.splice(arr.length - 1 - n);
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return arr;
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} else {
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let diff = n - arr.length;
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for (let i = 0; i < diff; i++) {
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arr.unshift(String.fromCharCode(0));
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}
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return arr;
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}
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}
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/*＊
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* Base32 decode the init secret
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*
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* @param {secret}
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* @type {String}
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* @desc input param, the init secret
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*
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* @return {String}
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*/
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static byte_secret(secret) {
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return Base32.decode(secret.toUpperCase());
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}
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/*＊
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* transfer the int type to BYTES type
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*
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* @param {input}
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* @type {int}
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* @desc input param, maybe counter or time
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*
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* @return {BYTES}
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*/
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static int_to_bytestring(input, padding=8) {
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let result = [];
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while (0 != input) {
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result.push(String.fromCharCode(input & 0xFF));
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input >>= 8;
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}
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result = result.reverse();
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result = Util.arr_rjust(result, padding).join("");
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return result;
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}
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/*＊
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* format the time string to int
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*
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* @param {time}
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* @type {Date}
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* @desc the time need to be format
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*
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* @param {interval}
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* @type {Int}
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* @desc interval means the one-time password's life,
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* default to be 30.
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*
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* @return {Int}
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*/
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static timecode(time, interval) {
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let time_str = Date.parse(time).toString();
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// fotmat the time, the ms is not needed.
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let format_time = time_str.substring(0, time_str.length-3);
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return parseInt(parseInt(format_time) / interval);
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}
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} |