redirect.js

console.log("it's on")

// global options
var hasVPN = true
var cancelNonessential = true

// the RULE below is unstable, use it only if you do not have good VPN
if (!hasVPN) {
  chrome.webRequest.onBeforeRequest.addListener(
    function (details) {
      var oldUrl = details.url
      // parse the old one
      var mark = 'libs/'
      var target = oldUrl.substring(oldUrl.indexOf(mark) + mark.length)
      console.log(target)
      var parts = target.split('/')
      var lib = parts[0]
      var ver = parts[1]
      var file = parts[2]
      console.log(parts)
      // bad cases for lib
      var newLib = ''
      switch (lib) {
        case 'angularjs':
          newLib = 'angular.js'
          break
        default:
          newLib = lib
      }
      // bad cases for file
      var newFile = ''
      switch (file) {
        case 'webfont.js':
          newFile = 'webfontloader.js'
          break
        default:
          newFile = file
      }
      var newUrl = 'https://cdnjs.cloudflare.com/ajax/libs/' + newLib + '/' + ver + '/' + newFile
      console.log('Switch URL to ' + newUrl)
      return { redirectUrl: newUrl }
    },
    {urls: [
      '*://ajax.googleapis.com/*'
    ]},
    ['blocking']
  )
}

// fonts & analytics are usually not essential for users
if (cancelNonessential) {
  chrome.webRequest.onBeforeRequest.addListener(
    function (details) {
      console.log('Requesting', details.url)
      return { cancel: true }
    },
    {urls: [
      '*://*.google-analytics.com/*',
      '*://fonts.googleapis.com/*'
    ]},
    ['blocking']
  )
}