Envoy Request Header Mutator

Overview

This Rust-based project implements a custom filter for Envoy proxy using the proxy_wasm framework. It is designed to mutate HTTP request headers based on predefined configurations. Supported operations include adding, modifying, replacing, and removing headers.

Features

• Add Headers: Add new headers to the HTTP request.
• Modify Headers: Modify existing headers based on regex patterns.
• Replace Headers: Replace the value of existing headers.
• Remove Headers: Remove specified headers from the request.

Dependencies

• proxy_wasm: Framework for building Envoy WASM filters.
• serde: Serialization and deserialization framework.
• regex: Regular expression library for header value manipulation.

Usage

1. Configuration: Define your header mutation rules in the configuration. The configuration should be in JSON format, defining the type of operation (Add, Modify, Replace, Remove) and the relevant parameters.

2. Build: Compile the project to generate a WASM binary.

3. Deployment: Deploy the compiled WASM binary as an Envoy filter.

Example Configuration

{
  "type": "Modify",
  "header": "example-header",
  "regex": "original-value",
  "replace_with": "new-value"
}

This example configuration will modify example-header in the HTTP request, replacing original-value with new-value. Logging

The filter uses proxy_wasm::set_log_level(LogLevel::Trace) for detailed logging, which can be adjusted as needed. Contributing

Contributions to this project are welcome. Please submit issues and pull requests via GitHub.

License