VK: Check Online

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Checks the last online on page user and in dialog
当前为 2021-04-21 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name            VK: Check Online
// @name:ru         ВК: Проверка онлайна
// @description     Checks the last online on page user and in dialog
// @description:ru  Проверяет последний онлайн пользователя на странице и в диалогe
// @namespace       vk-check-online.user.js
// @license         MIT
// @author          askornot
// @version         1.0.6
// @match           https://vk.com/*
// @connect         vk.com
// @compatible      chrome     Violentmonkey 2.12.7
// @compatible      firefox    Violentmonkey 2.12.7
// @homepageURL     http://greasyfork.icu/en/scripts/403717-vk-check-online
// @supportURL      http://greasyfork.icu/en/scripts/403717-vk-check-online/feedback
// @grant           GM_xmlhttpRequest
// @grant           GM.xmlHttpRequest
// @run-at          document-end
// @noframes
// ==/UserScript==

'use strict';

const USERS = new Map();

const request = (id, data = {}) =>
  new Promise((resolve, reject) => {
    data.method = 'GET';
    data.url = `/foaf.php?id=${id}`;
    data.onload = (r) => {
      const container = document.implementation.createHTMLDocument()
        .documentElement;
      container.innerHTML = r.responseText;
      resolve(container);
    };
    data.onerror = reject;

    typeof !GM && typeof !GM.xmlHttpRequest
      ? GM.xmlHttpRequest(data)
      : GM_xmlhttpRequest(data);
  });

const floor = (time) => Math.floor(time);

const now = () => floor(Date.now());

const render = (uts) => {
  const online =
    document.querySelector('.mail_box_label_info') ||
    document.querySelector('.profile_online_lv') ||
    document.querySelector('._im_page_peer_online');

  const {lang} = vk;

  const text = lang === 3 ? 'last seen' : 'заходил(а)';

  online.textContent = `${text} ${getDateText(uts, null)}`;
};

const getTs = (body) => {
  const [element] = body.getElementsByTagName('ya:lastloggedin');

  if (!element) return 0;

  const date = element.getAttribute('dc:date');

  const uts = floor(Date.parse(date) / 1000); // A getDateText requires unixtime

  return uts;
};

const getUser = (user) => (USERS.has(user) ? USERS.get(user) : {});

const start = async () => {
  const {options = {}, peer} = cur; // VK object

  const userId = peer
    ? peer
    : options.hasOwnProperty('user_id')
    ? options.user_id
    : 0;

  if (userId === 0 || Math.sign(userId) === -1) return;

  let {expires = 0, uts = 0} = getUser(userId);

  if (expires < now()) {
    try {
      const body = await request(userId);
      uts = getTs(body);

      USERS.set(userId, {
        uts,
        expires: now() + 60000, // Every one minute
      });
    } catch (error) {
      console.error(error.stack);
    }
  }

  if (uts === 0) return;

  render(uts);
};

start().catch(console.error);

const filterMutsByClassName = (muts) => {
  return muts.filter(
    (array, i, self) =>
      self.findIndex(
        (_array) => array.target.className === _array.target.className
      ) === i
  );
};

new MutationObserver((muts) => {
  muts = filterMutsByClassName(muts);

  for (const {target, addedNodes} of muts) {
    const {tagName} = target;

    if (tagName === 'DIV' || tagName === 'SPAN') {
      const {classList} = target;

      if (
        (classList.contains('wide_column') && addedNodes.length >= 2) ||
        classList.contains('box_body') ||
        classList.contains('_im_page_peer_online') ||
        classList.contains('im-page-chat-contain')
      ) {
        setTimeout(start, 1000);
      }
    }
  }
}).observe(document.body || document, {
  childList: true,
  subtree: true,
});