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use std::error::Error;
use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};
use std::{fmt, io};
use tokio::io::{AsyncRead, AsyncWrite};
pub(crate) mod private {
pub struct ForcePrivateApi;
}
pub struct ChannelBinding {
pub(crate) tls_server_end_point: Option<Vec<u8>>,
}
impl ChannelBinding {
pub fn none() -> ChannelBinding {
ChannelBinding {
tls_server_end_point: None,
}
}
pub fn tls_server_end_point(tls_server_end_point: Vec<u8>) -> ChannelBinding {
ChannelBinding {
tls_server_end_point: Some(tls_server_end_point),
}
}
}
#[cfg(feature = "runtime")]
pub trait MakeTlsConnect<S> {
type Stream: TlsStream + Unpin;
type TlsConnect: TlsConnect<S, Stream = Self::Stream>;
type Error: Into<Box<dyn Error + Sync + Send>>;
fn make_tls_connect(&mut self, domain: &str) -> Result<Self::TlsConnect, Self::Error>;
}
pub trait TlsConnect<S> {
type Stream: TlsStream + Unpin;
type Error: Into<Box<dyn Error + Sync + Send>>;
type Future: Future<Output = Result<Self::Stream, Self::Error>>;
fn connect(self, stream: S) -> Self::Future;
#[doc(hidden)]
fn can_connect(&self, _: private::ForcePrivateApi) -> bool {
true
}
}
pub trait TlsStream: AsyncRead + AsyncWrite {
fn channel_binding(&self) -> ChannelBinding;
}
#[derive(Debug, Copy, Clone)]
pub struct NoTls;
#[cfg(feature = "runtime")]
impl<S> MakeTlsConnect<S> for NoTls {
type Stream = NoTlsStream;
type TlsConnect = NoTls;
type Error = NoTlsError;
fn make_tls_connect(&mut self, _: &str) -> Result<NoTls, NoTlsError> {
Ok(NoTls)
}
}
impl<S> TlsConnect<S> for NoTls {
type Stream = NoTlsStream;
type Error = NoTlsError;
type Future = NoTlsFuture;
fn connect(self, _: S) -> NoTlsFuture {
NoTlsFuture(())
}
fn can_connect(&self, _: private::ForcePrivateApi) -> bool {
false
}
}
pub struct NoTlsFuture(());
impl Future for NoTlsFuture {
type Output = Result<NoTlsStream, NoTlsError>;
fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> {
Poll::Ready(Err(NoTlsError(())))
}
}
pub enum NoTlsStream {}
impl AsyncRead for NoTlsStream {
fn poll_read(
self: Pin<&mut Self>,
_: &mut Context<'_>,
_: &mut [u8],
) -> Poll<io::Result<usize>> {
match *self {}
}
}
impl AsyncWrite for NoTlsStream {
fn poll_write(self: Pin<&mut Self>, _: &mut Context<'_>, _: &[u8]) -> Poll<io::Result<usize>> {
match *self {}
}
fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> {
match *self {}
}
fn poll_shutdown(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> {
match *self {}
}
}
impl TlsStream for NoTlsStream {
fn channel_binding(&self) -> ChannelBinding {
match *self {}
}
}
#[derive(Debug)]
pub struct NoTlsError(());
impl fmt::Display for NoTlsError {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.write_str("no TLS implementation configured")
}
}
impl Error for NoTlsError {}