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Cloudflare Expression Builder

NOTE: Still a work in progress. Not ready for production use.

Cloudflare Expression Builder is a Deno module that simplifies the creation of expressions for Cloudflare’s firewall rules. It provides a fluent API to build complex expressions and includes a validation method that uses Cloudflare’s API to ensure the expression is valid.

Features

  • Fluent API for building expressions
  • Supports all Cloudflare firewall fields and operators
  • Validates expressions using Cloudflare’s API
  • Supports both free and paid Cloudflare plans

Usage

Here’s an example of how to use the ExpressionBuilder:

import { ExpressionBuilder } from "https://deno.land/x/cloudflare_expression_builder/mod.ts";

const builder = new ExpressionBuilder();
builder.addExpression("ip.src", "==", "1.2.3.4")
  .and()
  .addExpression("http.request.uri.path", "contains", "/admin");

console.log(builder.build()); // Outputs: ip.src == 1.2.3.4 and http.request.uri.path contains "/admin"

You can also validate the expression using Cloudflare’s API:

const isValid = await builder.validate();
console.log(isValid); // Outputs: true or throws an error

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.