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use std::{
io::{self, Read, Write},
pin::Pin,
task::{Context, Poll},
};
use futures::{pin_mut, ready, AsyncRead, AsyncWrite, FutureExt};
use crate::vec_buf::VecBuf;
use super::{
codec::{SecureCodec, SecureError},
crypto::CryptoStore,
};
#[derive(Debug)]
pub struct SecureStream<S> {
codec: SecureCodec<S>,
read_buf: VecBuf,
}
impl<S> SecureStream<S> {
pub fn new(crypto: CryptoStore, stream: S) -> Self {
Self {
codec: SecureCodec::new(crypto, stream),
read_buf: VecBuf::new(),
}
}
pub fn stream(&self) -> &S {
self.codec.stream()
}
pub fn stream_mut(&mut self) -> &mut S {
self.codec.stream_mut()
}
pub fn crypto(&self) -> &CryptoStore {
self.codec.crypto()
}
pub fn into_inner(self) -> (CryptoStore, S) {
self.codec.into_inner()
}
}
impl<S: Read> Read for SecureStream<S> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
if self.read_buf.is_empty() {
let chunk = self.codec.read_packet().map_err(io_error_map)?;
self.read_buf.push(chunk.data);
}
self.read_buf.read(buf)
}
}
impl<S: Write> Write for SecureStream<S> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.codec.write_data(buf).map_err(io_error_map)?;
Ok(buf.len())
}
fn flush(&mut self) -> io::Result<()> {
self.codec.stream_mut().flush()
}
}
impl<S: AsyncRead + Unpin> AsyncRead for SecureStream<S> {
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
if self.read_buf.is_empty() {
let chunk = {
let fut = self.codec.read_packet_async();
pin_mut!(fut);
ready!(fut.poll_unpin(cx).map_err(io_error_map)?)
};
self.read_buf.push(chunk.data);
}
Poll::Ready(self.read_buf.read(buf))
}
}
impl<S: AsyncWrite + Unpin> AsyncWrite for SecureStream<S> {
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context,
buf: &[u8],
) -> Poll<io::Result<usize>> {
{
let fut = self.codec.write_data_async(&buf);
pin_mut!(fut);
ready!(fut.poll_unpin(cx).map_err(io_error_map))?;
};
Poll::Ready(Ok(buf.len()))
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
Pin::new(self.codec.stream_mut()).poll_flush(cx)
}
fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
Pin::new(self.codec.stream_mut()).poll_close(cx)
}
}
fn io_error_map(err: SecureError) -> io::Error {
match err {
SecureError::Io(err) => err,
_ => io::Error::new(io::ErrorKind::InvalidData, "Invalid encryption data"),
}
}
