@petercraftsmn/auth-util/lib/util/commonUtil.js

Auth utility functions

/**
 * Put back /, + and = into the string
 * @returns {string}
 */
const reverseStringUrlSafe = (urlSafeString = '') => {
    let myString = urlSafeString
        .replaceAll('-', '+')
        .replaceAll('_', '/');
    while (myString.length % 4) myString += '=';
    return myString;
};

/** Decode string from base64
 * @param codedString
 * @returns {string}
 */
const base64ToAscii = (codedString) => {
    return Buffer.from(codedString, 'base64').toString('ascii');
}

/**
 * Encode string to base64 string
 * @param unCodedString
 * @returns {string}
 */
const asciiToBase64 = (unCodedString) => {
    return Buffer.from(unCodedString).toString('base64');
}

/**
 * Removes /, + and = from the string
 * @returns {string}
 */
const makeStringUrlSafe = (urlUnsafeString = '') => {
    return urlUnsafeString
        .replaceAll('+', '-')
        .replaceAll('/', '_')
        .replaceAll('=', '');
};

/**
 * Decompose password hash and return an object with
 * {algorithm: 'something', hash: 'some-hash', salt: 'some-salt'}
 * return null if error
 * @param passwordHash
 */
const decomposePasswordHashStoreString = (passwordHash) => {
    if(typeof passwordHash === 'string'){
        const splitHash = passwordHash.split('.');
        if (splitHash.length !== 3) return null;
        return {
            algorithm: splitHash[0].slice(1),
            hash: splitHash[1],
            salt: splitHash[2]
        };
    } else {
        return null;
    }
}

module.exports = {
    reverseStringUrlSafe,
    base64ToAscii,
    asciiToBase64,
    makeStringUrlSafe,
    decomposePasswordHashStoreString
};