#
actix_tls/connect/
rustls_0_22.rs

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    //! Rustls based connector service.
    //!
    //! See [`TlsConnector`] for main connector service factory docs.

    use std::{
        future::Future,
        io,
        pin::Pin,
        sync::Arc,
        task::{Context, Poll},
    };

    use actix_rt::net::ActixStream;
    use actix_service::{Service, ServiceFactory};
    use actix_utils::future::{ok, Ready};
    use futures_core::ready;
    use rustls_pki_types_1::ServerName;
    use tokio_rustls::{
        client::TlsStream as AsyncTlsStream, rustls::ClientConfig, Connect as RustlsConnect,
        TlsConnector as RustlsTlsConnector,
    };
    use tokio_rustls_025 as tokio_rustls;

    use crate::connect::{Connection, Host};

    pub mod reexports {
        //! Re-exports from the `rustls` v0.22 ecosystem that are useful for connectors.

        pub use tokio_rustls_025::{client::TlsStream as AsyncTlsStream, rustls::ClientConfig};
        #[cfg(feature = "rustls-0_22-webpki-roots")]
        pub use webpki_roots_026::TLS_SERVER_ROOTS;
    }

    /// Returns root certificates via `rustls-native-certs` crate as a rustls certificate store.
    ///
    /// See [`rustls_native_certs::load_native_certs()`] for more info on behavior and errors.
    ///
    /// [`rustls_native_certs::load_native_certs()`]: rustls_native_certs_07::load_native_certs()
    #[cfg(feature = "rustls-0_22-native-roots")]
    pub fn native_roots_cert_store() -> io::Result<tokio_rustls::rustls::RootCertStore> {
        let mut root_certs = tokio_rustls::rustls::RootCertStore::empty();

        for cert in rustls_native_certs_07::load_native_certs()? {
            root_certs.add(cert).unwrap();
        }

        Ok(root_certs)
    }

    /// Returns standard root certificates from `webpki-roots` crate as a rustls certificate store.
    #[cfg(feature = "rustls-0_22-webpki-roots")]
    pub fn webpki_roots_cert_store() -> tokio_rustls::rustls::RootCertStore {
        let mut root_certs = tokio_rustls::rustls::RootCertStore::empty();
        root_certs.extend(webpki_roots_026::TLS_SERVER_ROOTS.to_owned());
        root_certs
    }

    /// Connector service factory using `rustls`.
    #[derive(Clone)]
    pub struct TlsConnector {
        connector: Arc<ClientConfig>,
    }

    impl TlsConnector {
        /// Constructs new connector service factory from a `rustls` client configuration.
        pub fn new(connector: Arc<ClientConfig>) -> Self {
            TlsConnector { connector }
        }

        /// Constructs new connector service from a `rustls` client configuration.
        pub fn service(connector: Arc<ClientConfig>) -> TlsConnectorService {
            TlsConnectorService { connector }
        }
    }

    impl<R, IO> ServiceFactory<Connection<R, IO>> for TlsConnector
    where
        R: Host,
        IO: ActixStream + 'static,
    {
        type Response = Connection<R, AsyncTlsStream<IO>>;
        type Error = io::Error;
        type Config = ();
        type Service = TlsConnectorService;
        type InitError = ();
        type Future = Ready<Result<Self::Service, Self::InitError>>;

        fn new_service(&self, _: ()) -> Self::Future {
            ok(TlsConnectorService {
                connector: self.connector.clone(),
            })
        }
    }

    /// Connector service using `rustls`.
    #[derive(Clone)]
    pub struct TlsConnectorService {
        connector: Arc<ClientConfig>,
    }

    impl<R, IO> Service<Connection<R, IO>> for TlsConnectorService
    where
        R: Host,
        IO: ActixStream,
    {
        type Response = Connection<R, AsyncTlsStream<IO>>;
        type Error = io::Error;
        type Future = ConnectFut<R, IO>;

        actix_service::always_ready!();

        fn call(&self, connection: Connection<R, IO>) -> Self::Future {
            tracing::trace!("TLS handshake start for: {:?}", connection.hostname());
            let (stream, conn) = connection.replace_io(());

            match ServerName::try_from(conn.hostname()) {
                Ok(host) => ConnectFut::Future {
                    connect: RustlsTlsConnector::from(Arc::clone(&self.connector))
                        .connect(host.to_owned(), stream),
                    connection: Some(conn),
                },
                Err(_) => ConnectFut::InvalidServerName,
            }
        }
    }

    /// Connect future for Rustls service.
    #[doc(hidden)]
    #[allow(clippy::large_enum_variant)]
    pub enum ConnectFut<R, IO> {
        InvalidServerName,
        Future {
            connect: RustlsConnect<IO>,
            connection: Option<Connection<R, ()>>,
        },
    }

    impl<R, IO> Future for ConnectFut<R, IO>
    where
        R: Host,
        IO: ActixStream,
    {
        type Output = io::Result<Connection<R, AsyncTlsStream<IO>>>;

        fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
            match self.get_mut() {
                Self::InvalidServerName => Poll::Ready(Err(io::Error::new(
                    io::ErrorKind::InvalidInput,
                    "connection parameters specified invalid server name",
                ))),

                Self::Future {
                    connect,
                    connection,
                } => {
                    let stream = ready!(Pin::new(connect).poll(cx))?;
                    let connection = connection.take().unwrap();
                    tracing::trace!("TLS handshake success: {:?}", connection.hostname());
                    Poll::Ready(Ok(connection.replace_io(stream).1))
                }
            }
        }
    }