It is a common need to restrict access to your website to some specific IPs. In this post, I will show how to implement an IP Allow/Deny list using Ed

Implement IP Allow/Deny List at Edge with Cloudflare Workers and Upstash Redis

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2021-06-18 05:30:02

It is a common need to restrict access to your website to some specific IPs. In this post, I will show how to implement an IP Allow/Deny list using Edge computing. Let me first introduce Cloudflare Workers.

Cloudflare workers are quite popular technology in recent years. It became publicly available in 2017 and Cloudflare KV storage became publicly available in 2019.

Without going to very deep details of Cloudflare workers or KV storage, I will explain them briefly. With Cloudflare workers you can intercept any http request edge level, you can execute your code snippets and manipulate the request/response. Also you can use KV storage to make put/get a dictionary which is natively available inside Cloudflare Workers. You can quickly try playground environment, it is quite simple and 1-click test environment.

Apart from the Cloudflare KV Storage, as a developer you might need more advanced data structures. Also you might want to access KV storage from outside (like from a backend or an API or SDK clients). So recently we have enabled REST Api Upstash.