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use native_tls::{Protocol, TlsConnector, TlsStream};
use smtp::client::mock::MockStream;
use std::io::{self, ErrorKind, Read, Write};
use std::net::{Ipv4Addr, Shutdown, SocketAddr, SocketAddrV4, TcpStream};
use std::time::Duration;
#[derive(Clone)]
#[allow(missing_debug_implementations)]
pub struct ClientTlsParameters {
pub connector: TlsConnector,
pub domain: String,
}
impl ClientTlsParameters {
pub fn new(domain: String, connector: TlsConnector) -> ClientTlsParameters {
ClientTlsParameters { connector, domain }
}
}
pub const DEFAULT_TLS_PROTOCOLS: &[Protocol] = &[Protocol::Tlsv12];
#[derive(Debug)]
pub enum NetworkStream {
Tcp(TcpStream),
Tls(TlsStream<TcpStream>),
Mock(MockStream),
}
impl NetworkStream {
pub fn peer_addr(&self) -> io::Result<SocketAddr> {
match *self {
NetworkStream::Tcp(ref s) => s.peer_addr(),
NetworkStream::Tls(ref s) => s.get_ref().peer_addr(),
NetworkStream::Mock(_) => Ok(SocketAddr::V4(SocketAddrV4::new(
Ipv4Addr::new(127, 0, 0, 1),
80,
))),
}
}
pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
match *self {
NetworkStream::Tcp(ref s) => s.shutdown(how),
NetworkStream::Tls(ref s) => s.get_ref().shutdown(how),
NetworkStream::Mock(_) => Ok(()),
}
}
}
impl Read for NetworkStream {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
match *self {
NetworkStream::Tcp(ref mut s) => s.read(buf),
NetworkStream::Tls(ref mut s) => s.read(buf),
NetworkStream::Mock(ref mut s) => s.read(buf),
}
}
}
impl Write for NetworkStream {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
match *self {
NetworkStream::Tcp(ref mut s) => s.write(buf),
NetworkStream::Tls(ref mut s) => s.write(buf),
NetworkStream::Mock(ref mut s) => s.write(buf),
}
}
fn flush(&mut self) -> io::Result<()> {
match *self {
NetworkStream::Tcp(ref mut s) => s.flush(),
NetworkStream::Tls(ref mut s) => s.flush(),
NetworkStream::Mock(ref mut s) => s.flush(),
}
}
}
pub trait Connector: Sized {
fn connect(addr: &SocketAddr, tls_parameters: Option<&ClientTlsParameters>)
-> io::Result<Self>;
fn upgrade_tls(&mut self, tls_parameters: &ClientTlsParameters) -> io::Result<()>;
fn is_encrypted(&self) -> bool;
}
impl Connector for NetworkStream {
fn connect(
addr: &SocketAddr,
tls_parameters: Option<&ClientTlsParameters>,
) -> io::Result<NetworkStream> {
let tcp_stream = TcpStream::connect(addr)?;
match tls_parameters {
Some(context) => context
.connector
.connect(context.domain.as_ref(), tcp_stream)
.map(NetworkStream::Tls)
.map_err(|e| io::Error::new(ErrorKind::Other, e)),
None => Ok(NetworkStream::Tcp(tcp_stream)),
}
}
#[cfg_attr(feature = "cargo-clippy", allow(clippy::match_same_arms))]
fn upgrade_tls(&mut self, tls_parameters: &ClientTlsParameters) -> io::Result<()> {
*self = match *self {
NetworkStream::Tcp(ref mut stream) => match tls_parameters
.connector
.connect(tls_parameters.domain.as_ref(), stream.try_clone().unwrap())
{
Ok(tls_stream) => NetworkStream::Tls(tls_stream),
Err(err) => return Err(io::Error::new(ErrorKind::Other, err)),
},
NetworkStream::Tls(_) => return Ok(()),
NetworkStream::Mock(_) => return Ok(()),
};
Ok(())
}
#[cfg_attr(feature = "cargo-clippy", allow(clippy::match_same_arms))]
fn is_encrypted(&self) -> bool {
match *self {
NetworkStream::Tcp(_) => false,
NetworkStream::Tls(_) => true,
NetworkStream::Mock(_) => false,
}
}
}
pub trait Timeout: Sized {
fn set_read_timeout(&mut self, duration: Option<Duration>) -> io::Result<()>;
fn set_write_timeout(&mut self, duration: Option<Duration>) -> io::Result<()>;
}
impl Timeout for NetworkStream {
fn set_read_timeout(&mut self, duration: Option<Duration>) -> io::Result<()> {
match *self {
NetworkStream::Tcp(ref mut stream) => stream.set_read_timeout(duration),
NetworkStream::Tls(ref mut stream) => stream.get_ref().set_read_timeout(duration),
NetworkStream::Mock(_) => Ok(()),
}
}
fn set_write_timeout(&mut self, duration: Option<Duration>) -> io::Result<()> {
match *self {
NetworkStream::Tcp(ref mut stream) => stream.set_write_timeout(duration),
NetworkStream::Tls(ref mut stream) => stream.get_ref().set_write_timeout(duration),
NetworkStream::Mock(_) => Ok(()),
}
}
}