1use std::mem::replace;
2use futures::{Future, Async, Poll, Stream, sink, Sink};
3use tokio_io::{AsyncRead, AsyncWrite};
4use tokio_codec::Framed;
5use jid::Jid;
6use minidom::Element;
7
8use xmpp_codec::{XMPPCodec, Packet};
9use xmpp_stream::XMPPStream;
10use {Error, ProtocolError};
11
12const NS_XMPP_STREAM: &str = "http://etherx.jabber.org/streams";
13
14pub struct StreamStart<S: AsyncWrite> {
15 state: StreamStartState<S>,
16 jid: Jid,
17 ns: String,
18}
19
20enum StreamStartState<S: AsyncWrite> {
21 SendStart(sink::Send<Framed<S, XMPPCodec>>),
22 RecvStart(Framed<S, XMPPCodec>),
23 RecvFeatures(Framed<S, XMPPCodec>, String),
24 Invalid,
25}
26
27impl<S: AsyncWrite> StreamStart<S> {
28 pub fn from_stream(stream: Framed<S, XMPPCodec>, jid: Jid, ns: String) -> Self {
29 let attrs = [("to".to_owned(), jid.domain.clone()),
30 ("version".to_owned(), "1.0".to_owned()),
31 ("xmlns".to_owned(), ns.clone()),
32 ("xmlns:stream".to_owned(), NS_XMPP_STREAM.to_owned()),
33 ].iter().cloned().collect();
34 let send = stream.send(Packet::StreamStart(attrs));
35
36 StreamStart {
37 state: StreamStartState::SendStart(send),
38 jid,
39 ns,
40 }
41 }
42}
43
44impl<S: AsyncRead + AsyncWrite> Future for StreamStart<S> {
45 type Item = XMPPStream<S>;
46 type Error = Error;
47
48 fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
49 let old_state = replace(&mut self.state, StreamStartState::Invalid);
50 let mut retry = false;
51
52 let (new_state, result) = match old_state {
53 StreamStartState::SendStart(mut send) =>
54 match send.poll() {
55 Ok(Async::Ready(stream)) => {
56 retry = true;
57 (StreamStartState::RecvStart(stream), Ok(Async::NotReady))
58 },
59 Ok(Async::NotReady) =>
60 (StreamStartState::SendStart(send), Ok(Async::NotReady)),
61 Err(e) =>
62 (StreamStartState::Invalid, Err(e.into())),
63 },
64 StreamStartState::RecvStart(mut stream) =>
65 match stream.poll() {
66 Ok(Async::Ready(Some(Packet::StreamStart(stream_attrs)))) => {
67 let stream_ns = stream_attrs.get("xmlns")
68 .ok_or(ProtocolError::NoStreamNamespace)?
69 .clone();
70 if self.ns == "jabber:client" {
71 retry = true;
72 // TODO: skip RecvFeatures for version < 1.0
73 (StreamStartState::RecvFeatures(stream, stream_ns), Ok(Async::NotReady))
74 } else {
75 let id = stream_attrs.get("id")
76 .ok_or(ProtocolError::NoStreamId)?
77 .clone();
78 // FIXME: huge hack, shouldn’t be an element!
79 let stream = XMPPStream::new(self.jid.clone(), stream, self.ns.clone(), Element::builder(id).build());
80 (StreamStartState::Invalid, Ok(Async::Ready(stream)))
81 }
82 },
83 Ok(Async::Ready(_)) =>
84 return Err(ProtocolError::InvalidToken.into()),
85 Ok(Async::NotReady) =>
86 (StreamStartState::RecvStart(stream), Ok(Async::NotReady)),
87 Err(e) =>
88 return Err(ProtocolError::from(e).into()),
89 },
90 StreamStartState::RecvFeatures(mut stream, stream_ns) =>
91 match stream.poll() {
92 Ok(Async::Ready(Some(Packet::Stanza(stanza)))) =>
93 if stanza.is("features", NS_XMPP_STREAM) {
94 let stream = XMPPStream::new(self.jid.clone(), stream, self.ns.clone(), stanza);
95 (StreamStartState::Invalid, Ok(Async::Ready(stream)))
96 } else {
97 (StreamStartState::RecvFeatures(stream, stream_ns), Ok(Async::NotReady))
98 },
99 Ok(Async::Ready(_)) | Ok(Async::NotReady) =>
100 (StreamStartState::RecvFeatures(stream, stream_ns), Ok(Async::NotReady)),
101 Err(e) =>
102 return Err(ProtocolError::from(e).into()),
103 },
104 StreamStartState::Invalid =>
105 unreachable!(),
106 };
107
108 self.state = new_state;
109 if retry {
110 self.poll()
111 } else {
112 result
113 }
114 }
115}