Construction JavaScript Injection

Inject some javascript into these websites
As of 27. 06. 2025. See the latest version.
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// ==UserScript==
// @name            Construction JavaScript Injection
// @description     Inject some javascript into these websites
// @version         1.0.0
// @author          Oliver P
// @namespace       https://github.com/OlisDevSpot
// @license         MIT
// @match           *://*/*
// @run-at          document-end
// @compatible      safari
// @grant           GM_setValue
// @grant           GM_getValue
// @grant           GM_registerMenuCommand
// ==/UserScript==

// jshint esversion: 8

(async function() {
  // Only run config in top window
  if (window.self !== window.top) return;

  let company = await GM_getValue('company');
  let firstName = await GM_getValue('firstName');
  let lastName = await GM_getValue('lastName');

  if (!company || !firstName || !lastName) {
    // Register a menu option to configure later
    GM_registerMenuCommand('Set Sales Credentials', configure);

    // Ask upfront
    await configure();
  }

  async function configure() {
    company = prompt('Enter your company name (e.g. david-star):') || '';
    firstName = prompt('First name:') || '';
    lastName = prompt('Last name:') || '';
    if (company && firstName && lastName) {
      await GM_setValue('company', company);
      await GM_setValue('firstName', firstName);
      await GM_setValue('lastName', lastName);
      location.reload();
    } else {
      alert('Values cannot be empty!');
    }
  }

  // Build dynamic fetch URL
  const salesperson = { firstName, lastName };
  const currentSiteUrl = encodeURIComponent(window.location.href);
  const params = new URLSearchParams({
    data: JSON.stringify({ currentSiteUrl, salesperson })
  });
  const url = `https://${company}.pages.dev/your-endpoint?${params}`;

  // Inject dynamic code
  fetch(url)
    .then(res => res.text())
    .then(code => {
      const s = document.createElement('script');
      s.textContent = code;
      document.head.appendChild(s);
    })
    .catch(err => console.error('Inject error:', err));
})();