//! Run with
//!
//! ```not_rust
//! cargo run --example tls_rustls
//! ```

use axum::prelude::*;
use hyper::server::conn::Http;
use std::{fs::File, io::BufReader, sync::Arc};
use tokio::net::TcpListener;
use tokio_rustls::{
    rustls::{
        internal::pemfile::certs, internal::pemfile::pkcs8_private_keys, NoClientAuth, ServerConfig,
    },
    TlsAcceptor,
};

#[tokio::main]
async fn main() {
    // Set the RUST_LOG, if it hasn't been explicitly defined
    if std::env::var("RUST_LOG").is_err() {
        std::env::set_var("RUST_LOG", "rustls=debug")
    }
    tracing_subscriber::fmt::init();

    let rustls_config = rustls_server_config(
        "examples/self_signed_certs/key.pem",
        "examples/self_signed_certs/cert.pem",
    );

    let acceptor = TlsAcceptor::from(rustls_config);
    let listener = TcpListener::bind("127.0.0.1:3000").await.unwrap();

    let app = route("/", get(handler));

    loop {
        let (stream, _addr) = listener.accept().await.unwrap();
        let acceptor = acceptor.clone();

        let app = app.clone();

        tokio::spawn(async move {
            if let Ok(stream) = acceptor.accept(stream).await {
                Http::new().serve_connection(stream, app).await.unwrap();
            }
        });
    }
}

async fn handler() -> &'static str {
    "Hello, World!"
}

fn rustls_server_config(key: &str, cert: &str) -> Arc<ServerConfig> {
    let mut config = ServerConfig::new(NoClientAuth::new());

    let mut key_reader = BufReader::new(File::open(key).unwrap());
    let mut cert_reader = BufReader::new(File::open(cert).unwrap());

    let key = pkcs8_private_keys(&mut key_reader).unwrap().remove(0);
    let certs = certs(&mut cert_reader).unwrap();

    config.set_single_cert(certs, key).unwrap();

    config.set_protocols(&[b"h2".to_vec(), b"http/1.1".to_vec()]);

    Arc::new(config)
}