async-native-tls 0.3.0

Native TLS using futures
Documentation 
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// #![warn(rust_2018_idioms)]

use std::io::{self, Error};
use std::net::ToSocketAddrs;

use async_native_tls::TlsConnector;
use async_std::net::TcpStream;
use cfg_if::cfg_if;
use env_logger;

macro_rules! t {
    ($e:expr) => {
        match $e {
            Ok(e) => e,
            Err(e) => panic!("{} failed with {:?}", stringify!($e), e),
        }
    };
}

cfg_if! {
    if #[cfg(any(feature = "force-openssl",
                        all(not(target_os = "macos"),
                            not(target_os = "windows"),
                            not(target_os = "ios"))))] {
        fn verify_failed(err: &Error) {
            assert!(format!("{}", err).contains("certificate verify failed"))
        }

        use verify_failed as assert_expired_error;
        use verify_failed as assert_wrong_host;
        use verify_failed as assert_self_signed;
        use verify_failed as assert_untrusted_root;
    } else if #[cfg(any(target_os = "macos", target_os = "ios"))] {

        fn assert_invalid_cert_chain(err: &Error) {
            assert!(format!("{}", err).contains("was not trusted."))
        }

        use crate::assert_invalid_cert_chain as assert_expired_error;
        use crate::assert_invalid_cert_chain as assert_wrong_host;
        use crate::assert_invalid_cert_chain as assert_self_signed;
        use crate::assert_invalid_cert_chain as assert_untrusted_root;
    } else {
        fn assert_expired_error(err: &Error) {
            let s = err.to_string();
            assert!(s.contains("system clock"), "error = {:?}", s);
        }

        fn assert_wrong_host(err: &Error) {
            let s = err.to_string();
            assert!(s.contains("CN name"), "error = {:?}", s);
        }

        fn assert_self_signed(err: &Error) {
            let s = err.to_string();
            assert!(s.contains("root certificate which is not trusted"), "error = {:?}", s);
        }

        use assert_self_signed as assert_untrusted_root;
    }
}

async fn get_host(host: &'static str) -> Error {
    drop(env_logger::try_init());

    let addr = format!("{}:443", host);
    let addr = t!(addr.to_socket_addrs()).next().unwrap();

    let socket = t!(TcpStream::connect(&addr).await);
    let cx = TlsConnector::new();
    let res = cx
        .connect(host, socket)
        .await
        .map_err(|e| Error::new(io::ErrorKind::Other, e));

    assert!(res.is_err());
    res.err().unwrap()
}

#[async_std::test]
async fn expired() {
    assert_expired_error(&get_host("expired.badssl.com").await)
}

#[async_std::test]
async fn wrong_host() {
    assert_wrong_host(&get_host("wrong.host.badssl.com").await)
}

#[async_std::test]
async fn self_signed() {
    assert_self_signed(&get_host("self-signed.badssl.com").await)
}

#[async_std::test]
async fn untrusted_root() {
    assert_untrusted_root(&get_host("untrusted-root.badssl.com").await)
}