manager.js

import Cookie from './cookie.js';
import { readFile, writeFile } from 'fs/promises';
import { parse as parseSetCookie, splitCookiesString } from 'set-cookie-parser';
import { env } from '../../config.js';

const WRITE_INTERVAL = 60000,
    cookiePath = env.cookiePath,
    COUNTER = Symbol('counter');

let cookies = {},
    dirty = false,
    intervalId;

const setup = async () => {
    try {
        console.log('Loading cookies from', cookiePath);
        if (!cookiePath) return;

        cookies = await readFile(cookiePath, 'utf8');
        cookies = JSON.parse(cookies);
        intervalId = setInterval(writeChanges, WRITE_INTERVAL);

        console.log('Loaded cookies! Cookie dump:', cookies);
    } catch (e) {
        console.log(`Failed to load cookies: ${e}`);
    }
};

setup();

function writeChanges() {
    if (!dirty) return;
    dirty = false;

    writeFile(cookiePath, JSON.stringify(cookies, null, 4)).catch(() => {
        clearInterval(intervalId);
    });
}

export function getCookie(service) {
    console.log('Getting cookie for', service);
    if (!cookies[service] || !cookies[service].length) return;

    console.log('Cookies:', cookies[service]);
    let n;
    if (cookies[service][COUNTER] === undefined) {
        n = cookies[service][COUNTER] = 0;
    } else {
        ++cookies[service][COUNTER];
        n = cookies[service][COUNTER] %= cookies[service].length;
    }

    const cookie = cookies[service][n];
    if (typeof cookie === 'string')
        cookies[service][n] = Cookie.fromString(cookie);

    return cookies[service][n];
}

export function updateCookie(cookie, headers) {
    if (!cookie) return;

    const parsed = parseSetCookie(
            splitCookiesString(headers.get('set-cookie')),
            { decodeValues: false },
        ),
        values = {};

    cookie.unset(
        parsed.filter((c) => c.expires < new Date()).map((c) => c.name),
    );
    parsed
        .filter((c) => !c.expires || c.expires > new Date())
        .forEach((c) => (values[c.name] = c.value));
    updateCookieValues(cookie, values);
}

export function updateCookieValues(cookie, values) {
    cookie.set(values);
    if (Object.keys(values).length) dirty = true;
}