Unshortens URLs by following redirect chains (console only)
// ==UserScript==
// @name Simple URL Unshortener
// @namespace http://tampermonkey.net/
// @version 1.0
// @description Unshortens URLs by following redirect chains (console only)
// @author maanimis
// @match *://*/*
// @grant GM_registerMenuCommand
// @grant GM_xmlhttpRequest
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// Register the menu command
GM_registerMenuCommand("Unshorten URL", startUrlUnshortener);
function startUrlUnshortener() {
// Ask user for the shortened URL
const shortUrl = prompt("Enter the shortened URL to unshorten:");
if (!shortUrl) {
console.log("No URL entered. Operation cancelled.");
return;
}
// Validate URL format
try {
new URL(shortUrl);
} catch (e) {
console.log("Invalid URL format. Please enter a valid URL.");
return;
}
// Start the unshortening process
console.log("Starting URL unshortening process...");
console.log("Initial URL:", shortUrl);
const redirectChain = [shortUrl];
followRedirect(shortUrl, redirectChain, 0);
}
function followRedirect(url, redirectChain, step) {
// Maximum of 3 redirects
if (step >= 3) {
console.log("Reached maximum redirect depth (3)");
displayResults(redirectChain);
return;
}
console.log(`Following step ${step+1}: ${url}`);
GM_xmlhttpRequest({
method: "HEAD",
url: url,
headers: {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36"
},
timeout: 10000, // 10 second timeout
anonymous: true, // Don't send cookies
fetch: true, // Use fetch mode if available
onload: function(response) {
console.log(`Received response for ${url} with status: ${response.status}`);
// Check if we have a redirect status code
if (response.status >= 300 && response.status < 400) {
let nextUrl = null;
// Try to get location from response headers
if (response.responseHeaders) {
const locationMatch = response.responseHeaders.match(/location:\s*(.*?)(?:\r?\n|$)/i);
if (locationMatch && locationMatch[1]) {
nextUrl = locationMatch[1].trim();
}
}
// If we still don't have a nextUrl, try finalUrl
if (!nextUrl && response.finalUrl && response.finalUrl !== url) {
nextUrl = response.finalUrl;
}
// Process relative URLs if needed
if (nextUrl && !nextUrl.match(/^https?:\/\//i)) {
try {
const urlObj = new URL(url);
if (nextUrl.startsWith('/')) {
nextUrl = `${urlObj.protocol}//${urlObj.host}${nextUrl}`;
} else {
const path = urlObj.pathname.substring(0, urlObj.pathname.lastIndexOf('/') + 1);
nextUrl = `${urlObj.protocol}//${urlObj.host}${path}${nextUrl}`;
}
} catch (e) {
console.error("Error processing relative URL:", e);
}
}
if (nextUrl && nextUrl !== url) {
console.log(`Redirect found: ${nextUrl}`);
redirectChain.push(nextUrl);
followRedirect(nextUrl, redirectChain, step + 1);
} else {
console.log("No valid redirect found or redirect to same URL.");
displayResults(redirectChain);
}
} else {
// No redirect, we've reached the final URL
console.log(`Final URL reached: ${url}`);
displayResults(redirectChain);
}
},
onerror: function(error) {
console.error(`Error following redirect for ${url}:`, error);
displayResults(redirectChain);
},
ontimeout: function() {
console.error(`Request timed out for ${url}`);
displayResults(redirectChain);
}
});
}
function displayResults(redirectChain) {
console.log("\n===== URL UNSHORTENING RESULTS =====");
console.log("Complete redirect chain:");
redirectChain.forEach((url, index) => {
console.log(`${index + 1}. ${url}`);
});
console.log(`\nTotal URLs in chain: ${redirectChain.length}`);
console.log("======================================\n");
}
})();