Discord CDN timebomb informer: Prints to the console about the issued/expires search parameters in Discord attachment URLs

isex.user.js

// ==UserScript==
// @name         Discord CDN timebomb informer
// @namespace    https://dobby233liu.github.io
// @version      1.0.0c
// @description  Prints to the console about the issued/expires search parameters in Discord attachment URLs
// @author       Liu "Dobby233Liu" Wenyuan
// @match        https://media.discordapp.net/attachments/*
// @match        https://cdn.discordapp.com/attachments/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=discord.com
// @grant        none
// @run-at       document-start
// @updateURL    https://gist.github.com/Dobby233Liu/b5497c163d68c6d8ec4a5126ed5d1059/raw/isex.user.js
// @downloadURL  https://gist.github.com/Dobby233Liu/b5497c163d68c6d8ec4a5126ed5d1059/raw/isex.user.js
// @supportURL   https://gist.github.com/Dobby233Liu/b5497c163d68c6d8ec4a5126ed5d1059
// @license      WTFPL
// ==/UserScript==

"use strict"

function dateFromHex(n) {
    if (!n) return null
    return new Date(parseInt("0x" + n) * 1000 /* unix --> js */)
}

let search = new URLSearchParams(location.search)
let is = dateFromHex(search.get("is"))
let ex = dateFromHex(search.get("ex"))
let hm = search.get("hm")
if (!(is || ex || hm)) return

console.warn("[TIMEBOMB]", hm ? "(signature: " + hm + ")" : "")
if (is) {
    console.log("issued:", is)
}
if (ex) {
    let now = new Date()
    console.log("expires:", ex, now >= ex ? "(passed)" : "")
}