그래서 어느 엔진이라고?

fedicheck.js

// ==UserScript==
// @name         그래서 어느 엔진이라고?
// @namespace    http://buttersc.one/
// @version      0.1
// @description  우우우 이상한 권한 요구하는 플러그인이다 무섭지 우우우
// @author       갯가재
// @match        https://buttersc.one/
// @match        https://stella.place/
// @match        https://k.lapy.link/
// @icon         https://www.google.com/s2/favicons?sz=64&domain=buttersc.one
// @connect      *
// @grant        GM.xmlHttpRequest
// ==/UserScript==

function replacer(key, value) { //https://stackoverflow.com/questions/29085197/how-do-you-json-stringify-an-es6-map
  if(value instanceof Map) {
    return {
      dataType: 'Map',
      value: Array.from(value.entries()), // or with spread: value: [...value]
    };
  } else {
    return value;
  }
}

function reviver(key, value) {
  if(typeof value === 'object' && value !== null) {
    if (value.dataType === 'Map') {
      return new Map(value.value);
    }
  }
  return value;
}


(function() {
    'use strict';
    const config = { attributes: true, childList: true, subtree: true };

    var domainMap = new Map();

    let savedDMAP = localStorage.getItem("domainMap");

    if (savedDMAP != null) {
        domainMap = JSON.parse(savedDMAP, reviver);
        console.log(`domainMap Loaded: ${domainMap.size} entries`)
    }

    var inverval_timer = setInterval(function() {
        let sav = JSON.stringify(domainMap, replacer);
        localStorage.setItem("domainMap", sav);
        console.log(`domainMap Saved: ${domainMap.size} entries`)
    }, 1000 * 60);

    console.log('started');

    const callback = (mutLst, observer) => {
        observer.disconnect();
        console.log("Something Changed");
        let elements = document.querySelectorAll('div.xBLVI span:nth-child(2)');
        for (let elem of elements) {
            let parent = elem.parentNode;
            let domain = (elem.innerText).substring(1);
            if (parent.childElementCount > 2) {
                continue;
            }

            if (domainMap.has(domain)) {
                let entity = domainMap.get(domain);
                parent.innerHTML = parent.innerHTML.concat(`<span style="opacity: 0.4;">(${entity})</span>`);
            }
            else {
                GM.xmlHttpRequest({
                    method: "GET",
                    url: `https://${domain}/.well-known/nodeinfo`,
                    onload: function(res) {
                        if (res.readyState != 4 || res.status != 200) {
                            return;
                        }
                        let j = JSON.parse(res.responseText);
                        GM.xmlHttpRequest({
                            method: "GET",
                            url: j['links'][0]['href'],
                            onload: function(res) {
                                if (res.readyState != 4 || res.status != 200) {
                                    return;
                                }
                                let j = JSON.parse(res.responseText);
                                let entity = j['software']['name'];
                                domainMap.set(domain, entity);
                                console.log(`${domain} => ${entity}`);
                                if (parent.childElementCount > 2) {
                                    return;
                                }
                                parent.innerHTML = parent.innerHTML.concat(`<span style="opacity: 0.4;">(${entity})</span>`);
                            }
                        });
                    }
                });
            }
        }

        setTimeout(function(){ observer.observe(document.body, config); }, 1000);
    };
    const observer = new MutationObserver(callback);

    observer.observe(document.body, config);
})();