1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

//! `XMPPStream` provides encoding/decoding for XMPP

use futures::sink::Send;
use futures::{sink::SinkExt, task::Poll, Sink, Stream};
use rand::{thread_rng, Rng};
use std::pin::Pin;
use std::task::Context;
use tokio::io::{AsyncRead, AsyncWrite};
use tokio_util::codec::Framed;
use xmpp_parsers::{Element, Jid};

use crate::stream_features::StreamFeatures;
use crate::stream_start;
use crate::xmpp_codec::{Packet, XmppCodec};
use crate::Error;

fn make_id() -> String {
    let id: u64 = thread_rng().gen();
    format!("{}", id)
}

pub(crate) fn add_stanza_id(mut stanza: Element, default_ns: &str) -> Element {
    if stanza.is("iq", default_ns)
        || stanza.is("message", default_ns)
        || stanza.is("presence", default_ns)
    {
        if stanza.attr("id").is_none() {
            stanza.set_attr("id", make_id());
        }
    }

    stanza
}

/// Wraps a binary stream (tokio's `AsyncRead + AsyncWrite`) to decode
/// and encode XMPP packets.
///
/// Implements `Sink + Stream`
pub struct XMPPStream<S: AsyncRead + AsyncWrite + Unpin> {
    /// The local Jabber-Id
    pub jid: Jid,
    /// Codec instance
    pub stream: Framed<S, XmppCodec>,
    /// `<stream:features/>` for XMPP version 1.0
    pub stream_features: StreamFeatures,
    /// Root namespace
    ///
    /// This is different for either c2s, s2s, or component
    /// connections.
    pub ns: String,
    /// Stream `id` attribute
    pub id: String,
}

impl<S: AsyncRead + AsyncWrite + Unpin> XMPPStream<S> {
    /// Constructor
    pub fn new(
        jid: Jid,
        stream: Framed<S, XmppCodec>,
        ns: String,
        id: String,
        stream_features: Element,
    ) -> Self {
        XMPPStream {
            jid,
            stream,
            stream_features: StreamFeatures::new(stream_features),
            ns,
            id,
        }
    }

    /// Send a `<stream:stream>` start tag
    pub async fn start(stream: S, jid: Jid, ns: String) -> Result<Self, Error> {
        let xmpp_stream = Framed::new(stream, XmppCodec::new());
        stream_start::start(xmpp_stream, jid, ns).await
    }

    /// Unwraps the inner stream
    pub fn into_inner(self) -> S {
        self.stream.into_inner()
    }

    /// Re-run `start()`
    pub async fn restart(self) -> Result<Self, Error> {
        let stream = self.stream.into_inner();
        Self::start(stream, self.jid, self.ns).await
    }
}

impl<S: AsyncRead + AsyncWrite + Unpin> XMPPStream<S> {
    /// Convenience method
    pub fn send_stanza<E: Into<Element>>(&mut self, e: E) -> Send<Self, Packet> {
        self.send(Packet::Stanza(e.into()))
    }
}

/// Proxy to self.stream
impl<S: AsyncRead + AsyncWrite + Unpin> Sink<Packet> for XMPPStream<S> {
    type Error = crate::Error;

    fn poll_ready(self: Pin<&mut Self>, _ctx: &mut Context) -> Poll<Result<(), Self::Error>> {
        // Pin::new(&mut self.stream).poll_ready(ctx)
        //     .map_err(|e| e.into())
        Poll::Ready(Ok(()))
    }

    fn start_send(mut self: Pin<&mut Self>, item: Packet) -> Result<(), Self::Error> {
        Pin::new(&mut self.stream)
            .start_send(item)
            .map_err(|e| e.into())
    }

    fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
        Pin::new(&mut self.stream)
            .poll_flush(cx)
            .map_err(|e| e.into())
    }

    fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
        Pin::new(&mut self.stream)
            .poll_close(cx)
            .map_err(|e| e.into())
    }
}

/// Proxy to self.stream
impl<S: AsyncRead + AsyncWrite + Unpin> Stream for XMPPStream<S> {
    type Item = Result<Packet, crate::Error>;

    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
        Pin::new(&mut self.stream)
            .poll_next(cx)
            .map(|result| result.map(|result| result.map_err(|e| e.into())))
    }
}