A CloudFlare service worker that proxies purge cache requests. Example: https://example.com/__purge_cache?zone=XX

cloudflare-purge-cache-service-worker.js

addEventListener('fetch', event => {

    event.respondWith(purgeCache(event.request))

})

async function purgeCache(request) {

    const url = new URL(request.url)

    // If the path doesn't begin with our protected prefix, just pass the request through.
    if (!url.pathname.startsWith("/__purge_cache")) {
        return fetch(request)
    }

    // Lets validate the zone id, and return an error if invalid
    let zoneIdValidated = (new RegExp("^([a-z0-9]{32})$")).test(url.searchParams.get('zone'));

    if (!zoneIdValidated) {
        return new Response('Invalid Zone ID', {
          status: 500
        });
    }


    let content = '{"purge_everything":true}'
    let headers = {
        'Content-Type': 'application/json',
        'X-Auth-Email': '', // Cloudflare API Auth Email
        'X-Auth-Key': '' //Cloudflare API Auth Key
    }

    const init = {
        method: 'POST',
        headers: headers,
        body: content
    }
    
    const response = await fetch('https://api.cloudflare.com/client/v4/zones/'+url.searchParams.get('zone')+'/purge_cache', init)

    return response
}

Hi Martin. I can't get this to work properly.
When testing the worker from the Cloudflare dashboard I'm getting this result:

{
  "result": {
    "id": "xxxxxxxxxxxxxxxxxxxxxxxxx"
  },
  "success": true,
  "errors": [],
  "messages": []
}

But when using the link https://example.com/__purge_cache?zone=XX I'm getting a 404 error on my WordPress installation and nothing gets purged.

Any idea what could be happening?

Have you set up a worker route for /__purge_cache on your domain?

https://developers.cloudflare.com/workers/platform/routing/routes/

I have the default route Cloudflare creates when adding a new worker: https://my-worker.xxxxxxxxxx.workers.dev/

Going to the URL https://my-worker.xxxxxxxxxx.workers.dev/__purge_cache?zone=XX shows a JSON file. Is that okay or should I try adding a new subdomain for a different worker route?

Yes. A json file should be ok.

Hi, is it possible to skip a folder from clearing cache. For example, i have images in a folder domain.com/images which doesn't change. I want to skip this folder and clear remaining cache files.

Cloudflare announced the deprecation of Wrangler v1 from Cloudflare Workers.
Is this script affected because of that?

No