Implement IP Allow/Deny List at Edge with Cloudflare Workers and Upstash Redis
Blog post from Upstash
Cloudflare Workers, introduced in 2017, allow developers to intercept and manipulate HTTP requests at the edge, using code snippets and KV storage for data handling. This post outlines how to implement an IP Allow/Deny list using Cloudflare Workers and Upstash Redis as a source of truth, demonstrating the process of retrieving a visitor's IP address from request headers and checking it against an allowed list stored in a Redis database accessed via REST API. The application requires a Serverless Redis Database, a Cloudflare account, and basic JavaScript and Cloudflare Workers knowledge. The implementation involves creating a Cloudflare Worker to intercept requests, fetching the visitor's IP, and making a REST API call to check if the IP is allowed, with Redis providing the flexibility of various client SDKs and command-line interfaces. The post concludes by highlighting the potential for this application to serve as a security measure, with the ability to update configurations within the Redis database, which can be read by the Cloudflare Worker.
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