Discord mimic user name and avatar.

discord.js

// ==UserScript==
// @name         Discord Mimic
// @namespace    Discord
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://discord.com/*
// @icon         https://t1.gstatic.com/faviconV2?client=SOCIAL&type=FAVICON&fallback_opts=TYPE,SIZE,URL&url=http://discord.com
// @grant        GM_xmlhttpRequest
// @grant        GM.setValue
// @grant        GM.getValue
// @grant        GM_registerMenuCommand
// ==/UserScript==


const DISCORD_TOKEN = "TOKEN_HERE";

const getBase64FromUrl = (url,cb) => {
    GM_xmlhttpRequest({
        method: "GET",
        url: url,
        responseType: "blob",
        onload: function(response) {
            var blob = new Blob([this.response], {type: 'image/png'});
            var fileReader = new window.FileReader();
            fileReader.readAsDataURL(blob);
            fileReader.onloadend = function() {
                cb(fileReader.result);
            }
        }
    });
}

let stealUser = (reset) => {
    let hover = document.querySelectorAll(":hover");
    let el = hover[hover.length-1].closest('li');
    let avatar = el.querySelector('img[class*="avatar"]').getAttribute('src').replace('80','480');
    let user = el.querySelector('h3 span[id]').innerText;
    if(reset) {
        user = "Your Username";
        avatar = "https://avatar.link/image.png";
    }
    getBase64FromUrl(avatar, (data)=>{
        console.log("changing");
        //avatar
        fetch("/api/v9/users/@me", {
            "headers": {
                "accept": "*/*",
                "accept-language": "en-US,en;q=0.9,ro;q=0.8,hu;q=0.7,fr;q=0.6,bg;q=0.5,it;q=0.4,de;q=0.3",
                "authorization": DISCORD_TOKEN,
                "content-type": "application/json",
                "sec-ch-ua": "\" Not;A Brand\";v=\"99\", \"Google Chrome\";v=\"97\", \"Chromium\";v=\"97\"",
                "sec-ch-ua-mobile": "?0",
                "sec-ch-ua-platform": "\"Windows\"",
                "sec-fetch-dest": "empty",
                "sec-fetch-mode": "cors",
                "sec-fetch-site": "same-origin",
                "x-debug-options": "bugReporterEnabled",
                "x-discord-locale": "en-US",
            },
            "referrer": "https://discord.com/channels/484640057764872193/879435428682432542",
            "referrerPolicy": "strict-origin-when-cross-origin",
            "body": `{\"global_name\":\"${user}\",\"avatar\":\"${data}\"}`,
            "method": "PATCH",
            "mode": "cors",
            "credentials": "include"
        });
    });
}

GM_registerMenuCommand("Mimic User",()=> {
    setTimeout( () => stealUser(),500);
},"m");
GM_registerMenuCommand("Reset User",()=> {
    setTimeout( () => stealUser(true),500);
},"r");