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use std::fmt;
use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};
use hyper::{client::connect::HttpConnector, service::Service, Uri};
use tokio::io::{AsyncRead, AsyncWrite};
use tokio_native_tls::TlsConnector;
use crate::stream::MaybeHttpsStream;
type BoxError = Box<dyn std::error::Error + Send + Sync>;
/// A Connector for the `https` scheme.
#[derive(Clone)]
pub struct HttpsConnector<T> {
force_https: bool,
http: T,
tls: TlsConnector,
}
impl HttpsConnector<HttpConnector> {
/// Construct a new HttpsConnector.
///
/// This uses hyper's default `HttpConnector`, and default `TlsConnector`.
/// If you wish to use something besides the defaults, use `From::from`.
///
/// # Note
///
/// By default this connector will use plain HTTP if the URL provded uses
/// the HTTP scheme (eg: http://example.com/).
///
/// If you would like to force the use of HTTPS then call https_only(true)
/// on the returned connector.
///
/// # Panics
///
/// This will panic if the underlying TLS context could not be created.
///
/// To handle that error yourself, you can use the `HttpsConnector::from`
/// constructor after trying to make a `TlsConnector`.
pub fn new() -> Self {
native_tls::TlsConnector::new()
.map(|tls| HttpsConnector::new_(tls.into()))
.unwrap_or_else(|e| panic!("HttpsConnector::new() failure: {}", e))
}
fn new_(tls: TlsConnector) -> Self {
let mut http = HttpConnector::new();
http.enforce_http(false);
HttpsConnector::from((http, tls))
}
}
impl<T: Default> Default for HttpsConnector<T> {
fn default() -> Self {
Self::new_with_connector(Default::default())
}
}
impl<T> HttpsConnector<T> {
/// Force the use of HTTPS when connecting.
///
/// If a URL is not `https` when connecting, an error is returned.
pub fn https_only(&mut self, enable: bool) {
self.force_https = enable;
}
/// With connector constructor
///
pub fn new_with_connector(http: T) -> Self {
native_tls::TlsConnector::new()
.map(|tls| HttpsConnector::from((http, tls.into())))
.unwrap_or_else(|e| {
panic!(
"HttpsConnector::new_with_connector(<connector>) failure: {}",
e
)
})
}
}
impl<T> From<(T, TlsConnector)> for HttpsConnector<T> {
fn from(args: (T, TlsConnector)) -> HttpsConnector<T> {
HttpsConnector {
force_https: false,
http: args.0,
tls: args.1,
}
}
}
impl<T: fmt::Debug> fmt::Debug for HttpsConnector<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("HttpsConnector")
.field("force_https", &self.force_https)
.field("http", &self.http)
.finish()
}
}
impl<T> Service<Uri> for HttpsConnector<T>
where
T: Service<Uri>,
T::Response: AsyncRead + AsyncWrite + Send + Unpin,
T::Future: Send + 'static,
T::Error: Into<BoxError>,
{
type Response = MaybeHttpsStream<T::Response>;
type Error = BoxError;
type Future = HttpsConnecting<T::Response>;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
match self.http.poll_ready(cx) {
Poll::Ready(Ok(())) => Poll::Ready(Ok(())),
Poll::Ready(Err(e)) => Poll::Ready(Err(e.into())),
Poll::Pending => Poll::Pending,
}
}
fn call(&mut self, dst: Uri) -> Self::Future {
let is_https = dst.scheme_str() == Some("https");
// Early abort if HTTPS is forced but can't be used
if !is_https && self.force_https {
return err(ForceHttpsButUriNotHttps.into());
}
let host = dst
.host()
.unwrap_or("")
.trim_matches(|c| c == '[' || c == ']')
.to_owned();
let connecting = self.http.call(dst);
let tls = self.tls.clone();
let fut = async move {
let tcp = connecting.await.map_err(Into::into)?;
let maybe = if is_https {
let tls = tls.connect(&host, tcp).await?;
MaybeHttpsStream::Https(tls)
} else {
MaybeHttpsStream::Http(tcp)
};
Ok(maybe)
};
HttpsConnecting(Box::pin(fut))
}
}
fn err<T>(e: BoxError) -> HttpsConnecting<T> {
HttpsConnecting(Box::pin(async { Err(e) }))
}
type BoxedFut<T> = Pin<Box<dyn Future<Output = Result<MaybeHttpsStream<T>, BoxError>> + Send>>;
/// A Future representing work to connect to a URL, and a TLS handshake.
pub struct HttpsConnecting<T>(BoxedFut<T>);
impl<T: AsyncRead + AsyncWrite + Unpin> Future for HttpsConnecting<T> {
type Output = Result<MaybeHttpsStream<T>, BoxError>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
Pin::new(&mut self.0).poll(cx)
}
}
impl<T> fmt::Debug for HttpsConnecting<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.pad("HttpsConnecting")
}
}
// ===== Custom Errors =====
#[derive(Debug)]
struct ForceHttpsButUriNotHttps;
impl fmt::Display for ForceHttpsButUriNotHttps {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("https required but URI was not https")
}
}
impl std::error::Error for ForceHttpsButUriNotHttps {}
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