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101 lines
2.1 KiB
JavaScript
101 lines
2.1 KiB
JavaScript
/*
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* @module : TOTP module to generate and verify TOTP password
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* @author : Gin (gin.lance.inside@hotmail.com)
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*/
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import { OTP } from './otp';
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import { Util } from './util';
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export class TOTP extends OTP {
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/* ＊
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* @param {secret}
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* @type {String}
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* @desc random base32-encoded key to generate OTP.
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*
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* @param {interval}
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* @type {int}
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* @desc the time interval in seconds for OTP.
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* This defaults to 30.
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*
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* @return {OTP}
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*/
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constructor(secret, interval = 30) {
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super(secret);
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this.interval = interval;
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}
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/* ＊
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* Generate the OTP with current time.
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*
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* @return {OTP}
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*
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* @example
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* ```javascript
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* let totp = jsotp.TOTP('BASE32ENCODEDSECRET');
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* totp.now(); // => 432143
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* ```
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*/
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now() {
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// get now time string
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const now = Util.timecode(new Date(), this.interval);
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// generate the one-time password
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const digit = super.generate_otp(now);
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return digit;
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}
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/* ＊
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* Verifies the OTP passed in against the current time OTP.
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*
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* @param {otp}
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* @type {String}
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* @desc the OTP waiting for checking
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*
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* @param {time}
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* @type {int or datetime}
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* @desc Time to check OTP at (defaults to now)
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*
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* @return {Boolean}
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*
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* @example
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* ```javascript
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* let totp = jsotp.TOTP('BASE32ENCODEDSECRET');
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* totp.now(); // => 432143
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* // Verify for current time
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* totp.verify(432143); // => true
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* // Verify after 30s
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* totp.verify(432143); // => false
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* ```
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*/
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verify(otp, time = null) {
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let otp_time;
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if (time == null) {
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time = new Date();
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}
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otp_time = super.generate_otp(Util.timecode(time, this.interval));
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if (typeof(otp) === 'number') {
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otp = otp.toString();
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}
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if (otp === otp_time) {
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return true;
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}
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return false;
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}
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/* ＊
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* Generate a url with TOTP instance.
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*
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* @param {issuer}
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* @type {String}
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* @desc maybe it is the Service name
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*
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* @return {String}
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*/
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url_gen(issuer = '') {
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return super.url_gen(issuer, 'totp');
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}
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}
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