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wasm-extensions

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Contains miscellaneous Wasm extensions for Istio

// repository documentation

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# Istio Ecosystem Wasm Extensions

[![Test Status][test-badge]][test-link]

This repository contains several canonical Wasm extensions, which intend to demonstrate:

* Wasm extension development patterns.
* Best practice to test, build, and release a Wasm extension.

## Extensions

* *[Basic auth](/extensions/basic_auth/)* enforces basic auth based on request host, path, and methods. In this extension, you can find how to perform local auth decision based on headers and local reply, as well as JSON configuration string parsing and base64 decoding.

* *[C++ scaffold](/extensions/scaffold/)* provides an empty C++ extension, which can be used as a starting point to write a C++ Wasm extension.

* *[gRPC access logging](./extensions/grpc_logging)* makes a logging request to a gRPC service with various kinds of request and workload attributes. In this extension, you can find how to perform asynchronous telemetry reporting, fetch various request attributes and proxy properties, use protobuf and make gRPC callout.

* *JWT based routing ([WIP](https://github.com/istio-ecosystem/wasm-extensions/issues/16))* reads JWT token information from Envoy dynamic metadata written by JWT auth filter, update host header accordingly, and trigger routing recomputation. In this extension, you can find how to read dynamic metadata, manipulate headers, and affect request routing.

* *[Local rate limit](/extensions/local_rate_limit/)* applies a token bucket rate limit to incoming requests. Each request processed by the filter utilizes a single token, and if no tokens are available, the request is denied. In this extension you can find how to share data across all plugin VMs and deny request with local reply.

* *[wasm-oidc-plugin](https://github.com/antonengelhardt/wasm-oidc-plugin)* performs the OIDC Authorization Code Flow when session cookies are not presented in a request. These cookies are encrypted with AES-256-GCM and contain the authorization state of the client, such as `id_token` and `access_token`. The plugin can be configured to exclude certain hosts, paths, and URLs. ID Token validation is optional, and both the config reload interval and the cookie duration can be configured as desired.

* *[Open Policy Agent client](/extensions/open_policy_agent)* makes HTTP callout to an Open Policy Agent (OPA) server and based on OPA server response decides whether to allow or deny an incoming request. A result cache is also included to avoid expensive callout on every request. In this extension, you can find how to perform HTTP callout, and asynchronously continue or stop an incoming request based on the response of HTTP call. You will also find how to record stats, which can be scraped in the same way as Istio standard metrics.

* *[Zig scaffold](/extensions/zig_demo/)* provides an empty [Zig](https://ziglang.org/) extension, which can be used as a starting point to write a Zig Wasm extension.

## Development Guides

### Write a Wasm Extension with C++

* [Development set up](doc/development-setup.md)
* [Write, test, deploy, and maintain a C++ Wasm extension](./doc/write-a-wasm-extension-with-cpp.md)
* [Write unit test with C++ Wasm extension](./doc/write-cpp-unit-test.md)

### Integration Test

* [Write integration test with Istio proxy for Wasm extension](./doc/write-integration-test.md)

### Tips & Tricks

* [Wasm development tips and tricks](https://github.com/istio-ecosystem/wasm-extensions/wiki/Wasm-Development-Tips&Tricks)

[test-badge]: https://github.com/istio-ecosystem/wasm-extensions/workflows/Test/badge.svg
[test-link]: https://github.com/istio-ecosystem/wasm-extensions/actions?query=workflow%3ATest

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