Bilibili AntiBV

自动在地址栏中将 bv 还原为 av，非重定向，不会导致页面刷新，顺便清除 search string 中所有无用参数
Script suggéré par l'auteur
Vous pourriez également aimer Bilibili 哔哩哔哩视频点踩.
Installer ce script
Poser une question, écrire un avis, ou signaler le script.
// ==UserScript==
// @name         Bilibili AntiBV
// @icon         https://www.bilibili.com/favicon.ico
// @namespace    https://moe.best/
// @version      1.9.6
// @description  自动在地址栏中将 bv 还原为 av，非重定向，不会导致页面刷新，顺便清除 search string 中所有无用参数
// @author       神代绮凛
// @include      /^https:\/\/www\.bilibili\.com\/(s\/)?video\/[BbAa][Vv]/
// @require      https://code.bdstatic.com/npm/simple-query-string@1.3.2/src/simplequerystring.min.js
// @license      WTFPL
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_registerMenuCommand
// @run-at       document-start
// ==/UserScript==

(function () {
  'use strict';

  let REDIRECT_S_LINK = GM_getValue('redirect_s_link', true);
  GM_registerMenuCommand('自动重定向 /s/video/xxx', () => {
    REDIRECT_S_LINK = confirm(`自动将 /s/video/xxx 重定向至 /video/xxx
“确定”开启，“取消”关闭
当前：${REDIRECT_S_LINK ? '开启' : '关闭'}`);
    GM_setValue('redirect_s_link', REDIRECT_S_LINK);
  });

  if (REDIRECT_S_LINK && location.pathname.startsWith('/s/video/')) {
    location.pathname = location.pathname.replace(/^\/s/, '');
    return;
  }

  const win = typeof unsafeWindow === 'undefined' ? window : unsafeWindow;

  const last = arr => arr[arr.length - 1];

  const wrapHistory = method => {
    const fn = win.history[method];
    const e = new Event(method);
    return function () {
      setTimeout(() => window.dispatchEvent(e));
      return fn.apply(this, arguments);
    };
  };
  win.history.pushState = wrapHistory('pushState');

  win.history.replaceState = (() => {
    const fn = win.history.replaceState;
    return function (state, unused, url, isMe) {
      if (isMe) return fn.apply(this, [state, unused, url]);
      try {
        state = { ...history.state, ...state };
        const urlObj = new URL(url.startsWith('/') ? `${location.origin}${url}` : url);
        urlObj.search = purgeSearchString(urlObj.search);
        const bvid = getBvidFromUrl(urlObj.pathname);
        if (bvid) urlObj.pathname = location.pathname;
        url = urlObj.href.replace(urlObj.origin, '');
      } catch (e) {
        console.error(e);
      }
      return fn.apply(this, [state, unused, url]);
    };
  })();

  const getBvidFromUrl = pathname => {
    const lastPath = last(pathname.split('/').filter(v => v));
    return /^bv/i.test(lastPath) ? lastPath : null;
  };
  const getUrl = id => `/video/${id}/${purgeSearchString(location.search)}${location.hash}`;

  // https://github.com/mrhso/IshisashiWebsite/blob/master/%E4%B9%B1%E5%86%99%E7%A8%8B%E5%BC%8F/BV%20%E5%8F%B7%E8%B7%8B%E6%89%88%E3%80%80%EF%BD%9E%20Who%20done%20it!.js
  const bv2av = (() => {
    const charset = 'FcwAPNKTMug3GV5Lj7EJnHpWsx4tb8haYeviqBz6rkCy12mUSDQX9RdoZf';
    const bvReg = new RegExp(`^[Bb][Vv]1[${charset}]{9}$`);
    const base = BigInt(charset.length);
    const table = {};
    for (let i = 0; i < charset.length; i++) table[charset[i]] = i;
    const xor = 23442827791579n;
    const rangeLeft = 1n;
    const rangeRight = 2n ** 51n;

    /**
     * @param {string} bv
     */
    return bv => {
      if (!bvReg.test(bv)) {
        throw new Error(`Unexpected bv: ${bv}`);
      }

      const chars = bv.split('');
      [chars[3], chars[9]] = [chars[9], chars[3]];
      [chars[4], chars[7]] = [chars[7], chars[4]];

      let result = 0n;
      for (let i = 3; i < 12; i++) {
        result = result * base + BigInt(table[chars[i]]);
      }
      if (result < rangeRight || result >= rangeRight * 2n) {
        throw new RangeError(`Unexpected av result: ${result}`);
      }
      result = result % rangeRight ^ xor;
      if (result < rangeLeft) {
        throw new RangeError(`Unexpected av result: ${result}`);
      }

      return result;
    };
  })();

  const purgeSearchString = search => {
    const { p, t } = simpleQueryString.parse(search);
    const result = simpleQueryString.stringify({ p, t });
    return result ? `?${result}` : '';
  };

  const replaceUrl = () => {
    const bvid = getBvidFromUrl(location.pathname);
    const aid = bv2av(bvid);
    if (!aid) return;
    const avUrl = getUrl(`av${aid}`);
    const BABKey = `BAB-${avUrl}`;
    if (sessionStorage.getItem(BABKey)) {
      console.warn('[Bilibili AntiBV] abort');
      return;
    }
    sessionStorage.setItem(BABKey, 1);
    setTimeout(() => sessionStorage.removeItem(BABKey), 1000);
    history.replaceState({ ...history.state, aid, bvid }, '', avUrl, true);
  };

  const replaceBack = ({ state }) => {
    const { aid, bvid } = state;
    if (!bvid) return;
    history.replaceState(state, '', getUrl(bvid), true);
    setTimeout(() => history.replaceState(state, '', getUrl(`av${aid}`), true));
  };

  window.addEventListener('load', replaceUrl, { once: true });
  window.addEventListener('pushState', replaceUrl);
  window.addEventListener('popstate', replaceBack);
})();