80 lines
2.3 KiB
JavaScript
80 lines
2.3 KiB
JavaScript
import { getHOTP } from "./OTPGenerator.js";
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/**
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* TOTP instance
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*/
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export class TOTP {
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/**
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*
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* @param {string} secret base32 encoded string
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* @param {string} issuer issuer of TOTP
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* @param {string} client client of TOTP
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* @param {number} [digits=6] number of digits in OTP token
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* @param {number} [fetchTime=30] period of token in seconds
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* @param {number} [timeOffset=0] time offset for token in seconds
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* @param {string} [hashType='SHA-1'] type of hash (more in jsSHA documentation)
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*/
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constructor(
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secret,
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issuer,
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client,
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digits = 6,
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fetchTime = 30,
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timeOffset = 0,
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hashType = "SHA-1",
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) {
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this.secret = secret;
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this.issuer = issuer;
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this.client = client;
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this.digits = digits;
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this.fetchTime = fetchTime;
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this.timeOffset = timeOffset;
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this.hashType = hashType;
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}
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static copy(totp) {
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return new TOTP(
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(secret = totp.secret),
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(issuer = totp.TOTPissuer),
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(client = totp.client),
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(digits = totp.digits),
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(fetchTime = totp.fetchTime),
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(timeOffset = totp.timeOffset),
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(hashType = totp.hashType),
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);
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}
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/**
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*
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* @param {number} time time for counter (default unix time epoch)
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* @returns OTP instance
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*/
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getOTP(time = Date.now()) {
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const unixTime = (time / 1000 + this.timeOffset) / this.fetchTime;
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const otp = getHOTP(Math.floor(unixTime), this.secret, this.digits);
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const expireTime =
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time +
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(this.fetchTime -
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((time / 1000 + this.timeOffset) % this.fetchTime)) *
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1000;
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const createdTime =
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time - ((time / 1000 + this.timeOffset) % this.fetchTime) * 1000;
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return new OTP(otp, createdTime, expireTime);
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}
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}
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/**
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* Class for TOTP.getOTP result
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*/
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export class OTP {
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/**
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*
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* @param {string} otp OTP string
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* @param {number} createdTime time in unix epoch created OTP
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* @param {number} expireTime time in unix epoch to expire OTP
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*/
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constructor(otp, createdTime, expireTime) {
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this.otp = otp;
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this.createdTime = createdTime;
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this.expireTime = expireTime;
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}
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}
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