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Editing: admin-protected.js

writable 0666

// admin-protect.js
(function() {
  // ====== CONFIGURE HERE ======
  const PASSPHRASE = 'open';                // Change this for production!
  const COOKIE_DURATION = 60*60*24*30;      // 30 days in seconds
  const LOCAL_KEY_NAME = 'adm_cookieName';
  const LOCAL_KEY_VALUE = 'adm_cookieValue';

// ====== Helper functions ======
  function randName(len=8) {
    const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    let res = '';
    for(let i=0; i<len; ++i) res += chars[Math.floor(Math.random()*chars.length)];
    return res;
  }
  function setCookie(name, value, maxage) {
    document.cookie = name + "=" + value + "; path=/; max-age=" + maxage;
  }
  function getCookie(name) {
    const match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
    return match ? match[2] : null;
  }

// ====== Main logic ======
  let cookieName = localStorage.getItem(LOCAL_KEY_NAME);
  let cookieValue = localStorage.getItem(LOCAL_KEY_VALUE);
  let ok = false;

if (cookieName && cookieValue && getCookie(cookieName) === cookieValue) {
    ok = true;
  }

function hideBody() {
    document.documentElement.style.display = "none";
  }
  function showBody() {
    document.documentElement.style.display = "";
  }

if (!ok) {
    hideBody();
    let tries = 0;
    function askPass() {
      let entered = prompt("Enter admin passphrase to access this page:");
      if (entered === PASSPHRASE) {
        let newName = "adm_" + randName(7) + Date.now();
        let newValue = randName(20) + Date.now();
        setCookie(newName, newValue, COOKIE_DURATION);
        localStorage.setItem(LOCAL_KEY_NAME, newName);
        localStorage.setItem(LOCAL_KEY_VALUE, newValue);
        showBody();
        location.reload();
      } else {
        tries++;
        if(tries < 5) askPass();
        else { document.body.innerHTML = "<h2 style='color:red;text-align:center;margin-top:5em'>Access Denied</h2>"; showBody(); }
      }
    }
    document.addEventListener("DOMContentLoaded", askPass);
  }
})();

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Editing: admin-protected.js

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