otp-code-generator-and-validator/lib/index.js

Generate and validate time-based OTP (one time password) for multifactor authentication.

import lodash from "lodash";
import { toDataURL } from "qrcode";
import { generateHOTP, getCounterFromTime } from "./utils.js";
export { generateSecret, generateTOTP, verifyTOTP, generateKeyUri, generateQRCode };
function generateSecret() {
    let length = 16;
    let delimiter = "";
    let array = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567".repeat(length).split(delimiter);
    for (let i = (array.length - 1); i > 0; i--) {
        let j = Math.floor(Math.random() * (i + 1));
        [array[i], array[j]] = [array[j], array[i]];
    }
    return array.join(delimiter).substring(0, length);
}
function generateTOTP({ secret, now = Date.now(), timeStep = 30 }) {
    let counter = getCounterFromTime({
        now,
        timeStep
    });
    return generateHOTP({
        key: secret,
        counter
    });
}
function verifyTOTP({ secret, token, now = Date.now(), timeStep = 30 }) {
    let counter = getCounterFromTime({
        now,
        timeStep
    });
    return generateHOTP({
        key: secret,
        counter
    }) === token;
}
function generateKeyUri({ secret, account, app = "", timeStep = 30 }) {
    let params = {};
    if (app) {
        params = {
            ...params,
            issuer: app
        };
    }
    params = {
        ...params,
        secret,
        algorithm: "SHA1",
        digits: 6,
        period: timeStep
    };
    let paramsString = lodash(params).map((value, key) => {
        return (encodeURIComponent(key) + "=" + encodeURIComponent(value));
    }).join("&");
    return ("otpauth://totp/" + (app ?? (encodeURIComponent(app) + ":")) + encodeURIComponent(account) + "?" + paramsString);
}
async function generateQRCode({ text, options = {
    errorCorrectionLevel: "medium",
    type: "image/png",
    width: 500,
    color: {
        dark: "#000000",
        light: "#ffffff"
    }
} }) {
    return toDataURL(text.trim(), {
        ...options
    });
}
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