113 lines
4.1 KiB
Rust
113 lines
4.1 KiB
Rust
use std::mem::replace;
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use futures::{Future, Sink, Poll, Async};
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use futures::stream::Stream;
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use futures::sink;
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use tokio_io::{AsyncRead, AsyncWrite};
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use tokio_tls::{TlsStream, TlsConnector, Connect};
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use native_tls::TlsConnector as NativeTlsConnector;
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use minidom::Element;
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use jid::Jid;
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use crate::xmpp_codec::Packet;
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use crate::xmpp_stream::XMPPStream;
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use crate::Error;
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/// XMPP TLS XML namespace
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pub const NS_XMPP_TLS: &str = "urn:ietf:params:xml:ns:xmpp-tls";
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/// XMPP stream that switches to TLS if available in received features
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pub struct StartTlsClient<S: AsyncRead + AsyncWrite> {
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state: StartTlsClientState<S>,
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jid: Jid,
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}
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enum StartTlsClientState<S: AsyncRead + AsyncWrite> {
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Invalid,
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SendStartTls(sink::Send<XMPPStream<S>>),
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AwaitProceed(XMPPStream<S>),
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StartingTls(Connect<S>),
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}
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impl<S: AsyncRead + AsyncWrite> StartTlsClient<S> {
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/// Waits for <stream:features>
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pub fn from_stream(xmpp_stream: XMPPStream<S>) -> Self {
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let jid = xmpp_stream.jid.clone();
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let nonza = Element::builder("starttls")
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.ns(NS_XMPP_TLS)
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.build();
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let packet = Packet::Stanza(nonza);
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let send = xmpp_stream.send(packet);
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StartTlsClient {
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state: StartTlsClientState::SendStartTls(send),
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jid,
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}
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}
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}
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impl<S: AsyncRead + AsyncWrite> Future for StartTlsClient<S> {
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type Item = TlsStream<S>;
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type Error = Error;
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fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
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let old_state = replace(&mut self.state, StartTlsClientState::Invalid);
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let mut retry = false;
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let (new_state, result) = match old_state {
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StartTlsClientState::SendStartTls(mut send) =>
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match send.poll() {
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Ok(Async::Ready(xmpp_stream)) => {
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let new_state = StartTlsClientState::AwaitProceed(xmpp_stream);
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retry = true;
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(new_state, Ok(Async::NotReady))
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},
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Ok(Async::NotReady) =>
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(StartTlsClientState::SendStartTls(send), Ok(Async::NotReady)),
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Err(e) =>
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(StartTlsClientState::SendStartTls(send), Err(e.into())),
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},
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StartTlsClientState::AwaitProceed(mut xmpp_stream) =>
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match xmpp_stream.poll() {
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Ok(Async::Ready(Some(Packet::Stanza(ref stanza))))
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if stanza.name() == "proceed" =>
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{
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let stream = xmpp_stream.stream.into_inner();
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let connect = TlsConnector::from(NativeTlsConnector::builder()
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.build().unwrap())
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.connect(&self.jid.domain, stream);
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let new_state = StartTlsClientState::StartingTls(connect);
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retry = true;
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(new_state, Ok(Async::NotReady))
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},
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Ok(Async::Ready(value)) => {
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println!("StartTlsClient ignore {:?}", value);
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(StartTlsClientState::AwaitProceed(xmpp_stream), Ok(Async::NotReady))
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},
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Ok(_) =>
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(StartTlsClientState::AwaitProceed(xmpp_stream), Ok(Async::NotReady)),
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Err(e) =>
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(StartTlsClientState::AwaitProceed(xmpp_stream), Err(Error::Protocol(e.into()))),
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},
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StartTlsClientState::StartingTls(mut connect) =>
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match connect.poll() {
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Ok(Async::Ready(tls_stream)) =>
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(StartTlsClientState::Invalid, Ok(Async::Ready(tls_stream))),
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Ok(Async::NotReady) =>
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(StartTlsClientState::StartingTls(connect), Ok(Async::NotReady)),
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Err(e) =>
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(StartTlsClientState::Invalid, Err(e.into())),
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},
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StartTlsClientState::Invalid =>
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unreachable!(),
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};
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self.state = new_state;
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if retry {
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self.poll()
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} else {
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result
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}
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}
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}
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