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YouTube URL Tracker Remover

Fixes user-tracking links in the description of YouTube videos

当前为 2021-10-04 提交的版本，查看 最新版本。

// ==UserScript==
// @name YouTube URL Tracker Remover
// @description Fixes user-tracking links in the description of YouTube videos
// @version 1.1.2
// @author guihkx
// @match https://*.youtube.com/*
// @license MIT; https://opensource.org/licenses/MIT
// @run-at document-start
// @noframes
// @namespace https://github.com/guihkx
// @icon https://s.ytimg.com/yts/img/favicon_48-vflVjB_Qk.png
// @homepageURL https://github.com/guihkx/user-scripts
// @supportURL https://github.com/guihkx/user-scripts/issues
// ==/UserScript==

/**
 * Changelog:
 *
 * @version 1.1.2
 * - Fix script sometimes not injecting on Firefox with Violentmonkey
 *
 * @version 1.1.1:
 * - Fix wrong selector
 *
 * @version 1.1.0:
 * - Remove support for legacy YouTube (Polymer)
 *
 * @version 1.0.0:
 * - First release
 */

;(() => {
  'use strict'

  const eventName = 'yt-page-data-updated'
  const descriptionSelector = '#description > yt-formatted-string'

  document.addEventListener(eventName, () => {
    log('Event called:', eventName)

    const descriptionNode = document.querySelector(descriptionSelector)

    if (descriptionNode === null) {
      log('NULL description node. Not on a video page?')
      return
    }
    removeYoutubeTracking(descriptionNode)
  })

  function removeYoutubeTracking (descriptionNode) {
    const descLinks = descriptionNode.getElementsByTagName('a')

    for (const aTag of descLinks) {
      const rawUrl = aTag.href

      // Ignore timestamps
      if (+aTag.textContent[0] >= 0) {
        continue
      }
      // Ignore hashtags
      if (aTag.textContent[0] === '#') {
        continue
      }
      // Ignore URLs within the youtube.com domain
      if (aTag.pathname !== '/redirect') {
        aTag.textContent = rawUrl
        continue
      }
      const actualUrl = getQueryString('q', aTag)

      if (actualUrl === null) {
        log('Unable to extract URL from /redirect: ', aTag)
        continue
      }
      aTag.href = actualUrl
      aTag.textContent = actualUrl
    }
  }

  function getQueryString (name, aTag) {
    const qsRegEx = new RegExp(`[?&]${name}=([^&#]*)`)
    const matches = aTag.search.match(qsRegEx)

    return matches === null ? null : decodeURIComponent(matches[1])
  }

  function log () {
    console.log('[YouTube URL Tracker Remover]', ...arguments)
  }
})()