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Bootta11 / Localhost sites storage sync

// ==UserScript==
// @name         Localhost sites storage sync
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Sync localstorage for localhost sites
// @author       You
// @match        http*://localhost:*/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=undefined.localhost
// @require      https://openuserjs.org/src/libs/sizzle/GM_config.js
// @grant        GM_registerMenuCommand
// @grant        GM_getValue
// @grant        GM_setValue
// @license MIT
// ==/UserScript==

(function () {
  'use strict';

  let checkInterval, rpaInterval;
  let defaultInterval = 1000;

  GM_config.init({
    'id': 'scriptConfig',
    'fields': {
      'mainHost': {
        'label': 'Main site host',
        'type': 'text',
        'title': 'Host of main site(include port if different of 80. Example: localhost:8080)',
        'default': 'localhost'
      },
      'rpaHost': {
        'label': 'Rpa site host',
        'type': 'text',
        'title': 'Host of rpa site',
        'default': 'localhost:3000'
      }
    }
  });

  GM_registerMenuCommand("Options", function () {
    GM_config.open();
  }, "a");

  checkInterval = setInterval(checkToken, defaultInterval)
  rpaInterval = setInterval(setRpaLocalStorage, defaultInterval)

  function checkToken() {
    if (location.host !== GM_config.get('mainHost')) {
      return;
    }

    if (GM_getValue('mainToken') !== localStorage.getItem('Steve.session.token')) {
      GM_setValue('mainToken', localStorage.getItem('Steve.session.token'));
      GM_setValue('mainLocalStorage', JSON.stringify(localStorage));
    }
  }

  function setRpaLocalStorage() {
    if (location.host !== GM_config.get('rpaHost')) {
      return;
    }

    const mainToken = GM_getValue('mainToken');

    if (mainToken !== null && mainToken !== undefined && GM_getValue('mainToken') !== localStorage.getItem('Steve.session.token')) {
      let mainLocalStorage = JSON.parse(GM_getValue('mainLocalStorage'));
      for (let key in mainLocalStorage) {
        localStorage.setItem(key, mainLocalStorage[key]);
      }
      location.reload();
    }
  }
})();