Expand description
Collection of protobuf types and other assets to work with the Envoy Proxy through Rust gRPC services.
Among other use cases, this crate can be used to implement an Envoy External Authorization (ExtAuthz) gRPC Server written in Rust.
§Getting Started
§Rust Version
This project’s MSRV is 1.75.
§Dependencies
[dependencies]
envoy-types = "<envoy-types-version>"The protobuf types made available are already pre-compiled, so you only need the
latest stable Protocol Buffer Compiler (protoc) to run the crate’s tests.
Generated code may vary across protoc versions, and the use of the latest
stable version is enforced by CI.
Installation instructions can be found here.
§Examples
The example bellow covers a bare-bones implementation of an Envoy ExtAuthz gRPC
AuthorizationServer, with tonic. A more complete implementation, including
query parameters and header manipulation, can be found at the examples
directory.
use std::env;
use tonic::{transport::Server, Request, Response, Status};
use envoy_types::ext_authz::v3::pb::{
Authorization, AuthorizationServer, CheckRequest, CheckResponse,
};
use envoy_types::ext_authz::v3::{CheckRequestExt, CheckResponseExt};
#[derive(Default)]
struct MyServer;
#[tonic::async_trait]
impl Authorization for MyServer {
async fn check(
&self,
request: Request<CheckRequest>,
) -> Result<Response<CheckResponse>, Status> {
let request = request.into_inner();
let client_headers = request
.get_client_headers()
.ok_or_else(|| Status::invalid_argument("client headers not populated by envoy"))?;
let mut request_status = Status::unauthenticated("not authorized");
if let Some(authorization) = client_headers.get("authorization") {
if authorization == "Bearer valid-token" {
request_status = Status::ok("request is valid");
}
}
Ok(Response::new(CheckResponse::with_status(request_status)))
}
}
// #[tokio::main]
// async fn main() -> Result<(), Box<dyn std::error::Error>> {
// let server_port = env::var("SERVER_PORT").unwrap_or("50051".into());
// let addr = format!("0.0.0.0:{server_port}").parse().unwrap();
// let server = MyServer;
// println!("AuthorizationServer listening on {addr}");
// Server::builder()
// .add_service(AuthorizationServer::new(server))
// .serve(addr)
// .await?;
// Ok(())
// }§Compatibility
The table bellow outlines the correspondence between the versions of tonic
and the compatible versions of envoy-types.