Blocks ad/tracker domains and handles anti-adblock popups
// ==UserScript==
// @name AdGuard DNS + Anti-Adblock Handler
// @description Blocks ad/tracker domains and handles anti-adblock popups
// @match *://*/*
// @version 0.0.1.20251028121705
// @namespace https://greasyfork.org/users/1531587
// ==/UserScript==
(function() {
'use strict';
const FILTER_URL = "https://adguardteam.github.io/AdGuardSDNSFilter/Filters/filter.txt";
const CACHE_KEY = "adguard_filter_cache";
const CACHE_TIME_KEY = "adguard_filter_cache_time";
const CACHE_TTL = 24 * 60 * 60 * 1000; // 24h
let blockedDomains = [];
async function loadFilterList() {
const lastFetch = parseInt(localStorage.getItem(CACHE_TIME_KEY) || "0", 10);
const now = Date.now();
if (now - lastFetch < CACHE_TTL) {
blockedDomains = JSON.parse(localStorage.getItem(CACHE_KEY) || "[]");
console.log("[AdGuard] Loaded cached domains:", blockedDomains.length);
return;
}
try {
const res = await fetch(FILTER_URL);
const text = await res.text();
blockedDomains = text.split("\n")
.filter(line => line.startsWith("||"))
.map(line => line.replace("||", "").replace("^", "").trim());
localStorage.setItem(CACHE_KEY, JSON.stringify(blockedDomains));
localStorage.setItem(CACHE_TIME_KEY, now.toString());
console.log("[AdGuard] Updated filter list:", blockedDomains.length);
} catch (e) {
console.warn("[AdGuard] Failed to fetch filter list", e);
blockedDomains = JSON.parse(localStorage.getItem(CACHE_KEY) || "[]");
}
}
// Block fetch requests
const origFetch = window.fetch;
window.fetch = function(input, init) {
const url = typeof input === "string" ? input : input.url;
if (blockedDomains.some(domain => url.includes(domain))) {
console.warn("[AdGuard] Blocked fetch:", url);
return Promise.reject("Blocked by AdGuard Userscript");
}
return origFetch.apply(this, arguments);
};
// Block XHR requests
const origOpen = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function(method, url) {
if (blockedDomains.some(domain => url.includes(domain))) {
console.warn("[AdGuard] Blocked XHR:", url);
return;
}
return origOpen.apply(this, arguments);
};
// Remove ad elements dynamically
const observer = new MutationObserver(() => {
blockedDomains.forEach(domain => {
document.querySelectorAll(`img[src*="${domain}"], iframe[src*="${domain}"], script[src*="${domain}"]`)
.forEach(el => {
console.warn("[AdGuard] Removed element:", el.src);
el.remove();
});
});
});
observer.observe(document.documentElement, { childList: true, subtree: true });
// Anti-Adblock detection
function showAntiAdblockModal() {
if (document.getElementById("adblock-modal")) return;
const modal = document.createElement("div");
modal.innerHTML = `
<div id="adblock-modal" style="
position: fixed; inset: 0;
background: rgba(0,0,0,0.6);
display: flex;
align-items: center;
justify-content: center;
z-index: 999999;">
<div style="
background: #fff;
padding: 20px 30px;
border-radius: 8px;
max-width: 400px;
text-align: center;
font-family: Arial, sans-serif;">
<h2 style="margin:0 0 10px; color:#e74c3c;">⚠ AdBlock Detected</h2>
<p style="margin:0 0 15px; font-size:15px; color:#333;">
This site detected you are using an Ad Blocker.<br>
Please disable it to continue smoothly.
</p>
<button id="disable-adblock-btn" style="
background:#e74c3c; color:#fff; padding:10px 20px;
border:none; border-radius:5px; font-size:14px; cursor:pointer;">
I Understand
</button>
</div>
</div>
`;
document.body.appendChild(modal);
document.getElementById("disable-adblock-btn").addEventListener("click", () => {
modal.remove();
});
}
function antiAdblockWatcher() {
const bait = document.createElement("div");
bait.className = "ad ad-banner ad-unit adblock-detect";
bait.style.position = "absolute";
bait.style.left = "-9999px";
document.body.appendChild(bait);
setTimeout(() => {
if (bait.offsetParent === null || bait.offsetHeight === 0 || bait.offsetWidth === 0) {
showAntiAdblockModal();
}
bait.remove();
}, 1500);
}
window.addEventListener("load", async () => {
await loadFilterList();
antiAdblockWatcher();
});
})();