chore: checkpoint before Python removal

vendor/quinn/examples/common/mod.rs

@@ -0,0 +1,73 @@
+#![cfg(any(feature = "rustls-aws-lc-rs", feature = "rustls-ring"))]
+//! Commonly used code in most examples.
+
+use quinn::{ClientConfig, Endpoint, ServerConfig};
+use rustls::pki_types::{CertificateDer, PrivatePkcs8KeyDer};
+
+use std::{error::Error, net::SocketAddr, sync::Arc};
+
+/// Constructs a QUIC endpoint configured for use a client only.
+///
+/// ## Args
+///
+/// - server_certs: list of trusted certificates.
+#[allow(unused)]
+pub fn make_client_endpoint(
+    bind_addr: SocketAddr,
+    server_certs: &[&[u8]],
+) -> Result<Endpoint, Box<dyn Error + Send + Sync + 'static>> {
+    let client_cfg = configure_client(server_certs)?;
+    let mut endpoint = Endpoint::client(bind_addr)?;
+    endpoint.set_default_client_config(client_cfg);
+    Ok(endpoint)
+}
+
+/// Constructs a QUIC endpoint configured to listen for incoming connections on a certain address
+/// and port.
+///
+/// ## Returns
+///
+/// - a stream of incoming QUIC connections
+/// - server certificate serialized into DER format
+#[allow(unused)]
+pub fn make_server_endpoint(
+    bind_addr: SocketAddr,
+) -> Result<(Endpoint, CertificateDer<'static>), Box<dyn Error + Send + Sync + 'static>> {
+    let (server_config, server_cert) = configure_server()?;
+    let endpoint = Endpoint::server(server_config, bind_addr)?;
+    Ok((endpoint, server_cert))
+}
+
+/// Builds default quinn client config and trusts given certificates.
+///
+/// ## Args
+///
+/// - server_certs: a list of trusted certificates in DER format.
+fn configure_client(
+    server_certs: &[&[u8]],
+) -> Result<ClientConfig, Box<dyn Error + Send + Sync + 'static>> {
+    let mut certs = rustls::RootCertStore::empty();
+    for cert in server_certs {
+        certs.add(CertificateDer::from(*cert))?;
+    }
+
+    Ok(ClientConfig::with_root_certificates(Arc::new(certs))?)
+}
+
+/// Returns default server configuration along with its certificate.
+fn configure_server()
+-> Result<(ServerConfig, CertificateDer<'static>), Box<dyn Error + Send + Sync + 'static>> {
+    let cert = rcgen::generate_simple_self_signed(vec!["localhost".into()]).unwrap();
+    let cert_der = CertificateDer::from(cert.cert);
+    let priv_key = PrivatePkcs8KeyDer::from(cert.signing_key.serialize_der());
+
+    let mut server_config =
+        ServerConfig::with_single_cert(vec![cert_der.clone()], priv_key.into())?;
+    let transport_config = Arc::get_mut(&mut server_config.transport).unwrap();
+    transport_config.max_concurrent_uni_streams(0_u8.into());
+
+    Ok((server_config, cert_der))
+}
+
+#[allow(unused)]
+pub const ALPN_QUIC_HTTP: &[&[u8]] = &[b"hq-29"];