Simple conditional redirects based on query string values

Developers Workers
1

Hi! I’m new to the workers scripts and learning to transfer some of our use cases to the cloud. In NGINX, we have a link redirector that redirects based on the query string, i.e:

https://www.example.com/redirector

For example, if this link will receive:

https://www.example.com/redirector/?url=https://sample1.com/path1&param2=val2&param3=val3
redirect it to: https://tracker1.com?url=https://sample1.com/path1&param2=val2&param3=val3

https://www.example.com/redirector?param1=val1&url=https://sample2.com/path2&param3=val3
redirect it to: https://tracker2.com?param1=val1&url=https://sample2.com/path2&param3=val3

else return a 404

We have this system set up in NGINX with regex matching on the values of the url parameter. I’m wondering how to implement this using a worker script as this should lower the latency. A simple script would be appreciated. Thanks for any nudge on the right direction!

2

Hi did you get this figured out?

3

Yes we did. Here it is if this will be useful to you:

addEventListener('fetch', event => {
  event.respondWith(myRedirect(event.request))
})

async function myRedirect(request) {
  let addr = new URL(request.url)
  let qs = addr.search
  // Assuming your GET parameter is "param" (i.e. ?param=value)
  let qs_val = addr.searchParams.get('param')
  
  // If "param" has value...
  if (qs_val) {
    if (qs_val.includes('text-to-search-here'))
      return new Response('', {status: 303, headers: {'Location': 'https://example.com/' + qs}})
    
    else if (qs_val.includes('another-text-to-search-here'))
      return new Response('', {status: 303, headers: {'Location': 'https://another-example.com/' + qs}})
    
    else
      return new Response('', {status: 303, headers: {'Location': 'https://www.majlovesreg.one/tag/code'}})
  }
  else
    return new Response('', {status: 303, headers: {'Location': 'https://www.majlovesreg.one/'}})

}
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