Notes/services/utils.js

"use strict";

const crypto = require('crypto');
const randtoken = require('rand-token').generator({source: 'crypto'});

function newNoteId() {
    return randomString(12);
}

function newNoteTreeId() {
    return randomString(12);
}

function newNoteHistoryId() {
    return randomString(12);
}

function randomString(length) {
    return randtoken.generate(length);
}

function randomSecureToken(bytes = 32) {
    return crypto.randomBytes(bytes).toString('base64');
}

function nowTimestamp() {
    return Math.floor(Date.now() / 1000);
}

function nowDate() {
    return dateStr(new Date());
}

function dateStr(date) {
    return date.toISOString().replace("T", " ").replace("Z", "");
}

/**
 * @param str - needs to be in the "YYYY-MM-DD HH:MM:SS.sss" format as outputted by dateStr().
 *              also is assumed to be GMT time, *not* local time
 */
function parseDate(str) {
    try {
        const isoDate = str.replace(" ", "T") + "Z";

        return new Date(Date.parse(isoDate));
    }
    catch (e) {
        throw new Error("Can't parse date from " + str + ": " + e.stack);
    }
}

function toBase64(plainText) {
    return Buffer.from(plainText).toString('base64');
}

function fromBase64(encodedText) {
    return Buffer.from(encodedText, 'base64');
}

function hmac(secret, value) {
    const hmac = crypto.createHmac('sha256', Buffer.from(secret.toString(), 'ASCII'));
    hmac.update(value.toString());
    return hmac.digest('base64');
}

function isElectron() {
    return !!process.versions['electron'];
}

function formatDateTimeFromTS(timestamp) {
    const date = new Date(timestamp * 1000);

    return date.toISOString();
}

function formatTwoTimestamps(origTS, newTS) {
    return "orig: " + formatDateTimeFromTS(origTS) + ", new: " + formatDateTimeFromTS(newTS);
}

function hash(text) {
    return crypto.createHash('sha1').update(text).digest('base64');
}

function isEmptyOrWhitespace(str) {
    return str === null || str.match(/^ *$/) !== null;
}


module.exports = {
    randomSecureToken,
    randomString,
    nowTimestamp,
    nowDate,
    dateStr,
    parseDate,
    newNoteId,
    newNoteTreeId,
    newNoteHistoryId,
    toBase64,
    fromBase64,
    hmac,
    isElectron,
    formatTwoTimestamps,
    hash,
    isEmptyOrWhitespace
};