redirects-v2

/**
 * Example using Service Worker to Implement Redirects  
 * You can see this here https://cloudflareworkers.com/#31db00788f92250dc6e7ce88fbda5c59:https://blog.cloudflare.com/old-category.asp
*/ 


addEventListener('fetch', event => {
  event.respondWith(fetchAndApply(event.request))
})
  
/**
 * Redirect if matches case
 * @param {Request} request
 */
async function fetchAndApply(request) {
  //  This extracts the path so you have a pattern to match
  var url = new URL(request.url);
  var path = url.pathname;
    // console.log('Path', path);

  //  This is to set-up any default protocol or host to minimize multiple redirects
  //  You can switch to using requested protocol (2nd option) if needed for dynamic environments
  //  var site = "https://www.cloudflare.com";
  var site = url.protocol + "//" + url.host;
    // console.log('Site:', site);

  //  This is a regex to match any extensions that we want to skip, these are static resources
  var staticRegex = /\.(css|js|json|otf|ttf|woff|woff2|doc|pdf|ppt|xls|tsv|txt|xml|tif|tiff|vcf|bmp|gif|ief|jpe|jpeg|jpg|ico|png|svg|webp|m1v|mov|mp2|mp3|mp4|mpa|mpe|mpeg|mpg|pbm|pgm|pnm|ppm|pps|ps|qt|ras|rgb|swf|wav|xbm|xpdl|xpm|xwd)\/?$/i;
  if (staticRegex.test(path) === true) { 
    var actionGroup = 'skip';
    var actionCause = 'Skip filetype:';
      // console.log(actionCause,path);
  }

  // This is regex to match specifically known files that are needed to load a page, so we can skip them
  var knownRegex = /(specs\.html)|(iframe_history\.html|\.cloudflare\/ga)$/i;
  if (knownRegex.test(path) === true) {
    var actionGroup = 'skip';
    var actionCause = 'Skip known path:';
      // console.log(actionCause,path);
  }

  //  This is a regex to match any legacy file extensions, such as .asp or .jsp so we can process them without delaying other requests
  var legacyRegex = /\.(asp|jsp)$/i;
  if (legacyRegex.test(path) === true) {
    var actionGroup = 'legacy';
    var actionCause = 'Redirect Legacy:';
      // console.log(actionCause,path);
  }

  //  If we know the action group, take action, otherwise apply defaults
  switch(actionGroup) {
    
    // This is any bucket that we've flagged to skip straight to loading
    case "skip":
      console.log(actionCause, path);
      const response = await fetch(request);
      return response;
      break;

    // This is a custom bucket of "legacy" pages we can check against
    case "legacy":
      // console.log(actionCause, path);
      // create object with list of matches for redirects
      const legacyRedirects = {
        '/old-category.jsp': site + '/products/cloudflare-workers/',
        '/example-2.asp': 'https://support.cloudflare.com/',
        '/example-3.jsp': 'https://developers.cloudflare.com/workers/api/route-matching/',
        '/test.asp': site + '/plans',
        '/test-2.jsp': 'https://developers.cloudflare.com/workers/about/how-workers-work/',
        '/test-3.asp': 'https://www.hivedigital.com/'
      } 
      var legacyDestination = legacyRedirects[path];
      if (typeof legacyDestination != 'undefined') {
        console.log(actionCause,path, '->', legacyDestination);
        return Response.redirect(legacyDestination, 301);
      } else {
        console.log('Default', actionCause, path);
        return Response.redirect('https://www.hivedigital.com/2018/12/18/redirects-using-cloudflare-workers/', 301);
      }
      break;

    // In this case, we didn't apply a pattern match, so there may be some one-off redirects to implement.
    default:
      // console.log('No Bucket: ', path);
      // create object with list of matches for redirects
      const noBucketredirects = {
        '/foo-category': site + '/products/cloudflare-workers/',
        '/foo-2': 'https://support.cloudflare.com/',
        '/foo-3': 'https://developers.cloudflare.com/workers/api/route-matching/',
        '/test': site + '/plans',
        '/test-2': 'https://developers.cloudflare.com/workers/about/how-workers-work/',
        '/test-3': 'https://www.hivedigital.com/'
      } 
      var noBucketdestination = noBucketredirects[path];
      if (typeof noBucketdestination != 'undefined') {
        console.log('Default: ',path,'->',noBucketdestination);
        return Response.redirect(noBucketdestination, 301);
      } else {
        console.log('Load: ',path);
        const response = await fetch(request);
        return response;
      }
      break;                
  }
}