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    use std::net::{Shutdown, SocketAddr};
    use std::{io, time};

    use actix_net::ssl;
    use openssl::ssl::{AlpnError, SslAcceptor, SslAcceptorBuilder};
    use tokio_io::{AsyncRead, AsyncWrite};
    use tokio_openssl::SslStream;

    use server::{IoStream, ServerFlags};

    /// Support `SSL` connections via openssl package
    ///
    /// `ssl` feature enables `OpensslAcceptor` type
    pub struct OpensslAcceptor<T> {
        _t: ssl::OpensslAcceptor<T>,
    }

    impl<T: AsyncRead + AsyncWrite> OpensslAcceptor<T> {
        /// Create `OpensslAcceptor` with enabled `HTTP/2` and `HTTP1.1` support.
        pub fn new(builder: SslAcceptorBuilder) -> io::Result<ssl::OpensslAcceptor<T>> {
            OpensslAcceptor::with_flags(builder, ServerFlags::HTTP1 | ServerFlags::HTTP2)
        }

        /// Create `OpensslAcceptor` with custom server flags.
        pub fn with_flags(
            builder: SslAcceptorBuilder, flags: ServerFlags,
        ) -> io::Result<ssl::OpensslAcceptor<T>> {
            let acceptor = openssl_acceptor_with_flags(builder, flags)?;

            Ok(ssl::OpensslAcceptor::new(acceptor))
        }
    }

    /// Configure `SslAcceptorBuilder` with custom server flags.
    pub fn openssl_acceptor_with_flags(
        mut builder: SslAcceptorBuilder, flags: ServerFlags,
    ) -> io::Result<SslAcceptor> {
        let mut protos = Vec::new();
        if flags.contains(ServerFlags::HTTP1) {
            protos.extend(b"\x08http/1.1");
        }
        if flags.contains(ServerFlags::HTTP2) {
            protos.extend(b"\x02h2");
            builder.set_alpn_select_callback(|_, protos| {
                const H2: &[u8] = b"\x02h2";
                if protos.windows(3).any(|window| window == H2) {
                    Ok(b"h2")
                } else {
                    Err(AlpnError::NOACK)
                }
            });
        }

        if !protos.is_empty() {
            builder.set_alpn_protos(&protos)?;
        }

        Ok(builder.build())
    }

    impl<T: IoStream> IoStream for SslStream<T> {
        #[inline]
        fn shutdown(&mut self, _how: Shutdown) -> io::Result<()> {
            let _ = self.get_mut().shutdown();
            Ok(())
        }

        #[inline]
        fn peer_addr(&self) -> Option<SocketAddr> {
            self.get_ref().get_ref().peer_addr()
        }

        #[inline]
        fn set_nodelay(&mut self, nodelay: bool) -> io::Result<()> {
            self.get_mut().get_mut().set_nodelay(nodelay)
        }

        #[inline]
        fn set_linger(&mut self, dur: Option<time::Duration>) -> io::Result<()> {
            self.get_mut().get_mut().set_linger(dur)
        }

        #[inline]
        fn set_keepalive(&mut self, dur: Option<time::Duration>) -> io::Result<()> {
            self.get_mut().get_mut().set_keepalive(dur)
        }
    }

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