Script example: IP Firewall

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Ben Gabler
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In this example, we'll show you how you can implement a simple but effective IP firewall using Serverless Scripting.

Create Script

Route: *

Note: this will apply the firewall to your entire site. If you want to lock down a specific part of your site you can change the route to be more specific. 

Script contents:

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

async function fetchAndApply(request) { 
  //Create an Array of IP's to block
  var blacklist = ["192.168.1.1", "192.168.1.2"];
  //Check if IP is blacklisted by getting the client IP from the x-sp-client-ip header
  if (blacklist.includes(request.headers.get('x-sp-client-ip'))) {
    return new Response('Sorry, this page is not available.',
    { status: 403, statusText: 'Forbidden' })
 }
 
 return fetch(request)
}

Accessing your Script

Once the above has been created, you can access your script using any of the delivery domains on your account. In my example, I can access this script with https://sitehash.stackpathcdn.com/hello-world

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