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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171

//! rustls module
use std::error::Error as StdError;
use std::io::{Error as IoError, ErrorKind, Result as IoResult};
use std::marker::PhantomData;
use std::pin::Pin;
use std::sync::Arc;
use std::task::{Context, Poll};

use futures_util::stream::{BoxStream, Stream, StreamExt};
use futures_util::task::noop_waker_ref;
use tokio::io::{AsyncRead, AsyncWrite};
use tokio_rustls::server::TlsStream;

use crate::conn::{Accepted, Acceptor, HandshakeStream, Holding, IntoConfigStream, Listener};
use crate::fuse::ArcFuseFactory;
use crate::http::uri::Scheme;
use crate::http::{HttpConnection, Version};

use super::ServerConfig;

/// A wrapper of `Listener` with rustls.
pub struct RustlsListener<S, C, T, E> {
    config_stream: S,
    inner: T,
    _phantom: PhantomData<(C, E)>,
}

impl<S, C, T, E> RustlsListener<S, C, T, E>
where
    S: IntoConfigStream<C> + Send + 'static,
    C: TryInto<ServerConfig, Error = E> + Send + 'static,
    T: Listener + Send,
    E: StdError + Send,
{
    /// Create a new `RustlsListener`.
    #[inline]
    pub fn new(config_stream: S, inner: T) -> Self {
        RustlsListener {
            config_stream,
            inner,
            _phantom: PhantomData,
        }
    }
}

impl<S, C, T, E> Listener for RustlsListener<S, C, T, E>
where
    S: IntoConfigStream<C> + Send + 'static,
    C: TryInto<ServerConfig, Error = E> + Send + 'static,
    T: Listener + Send,
    T::Acceptor: Send + 'static,
    E: StdError + Send,
{
    type Acceptor = RustlsAcceptor<BoxStream<'static, C>, C, T::Acceptor, E>;

    async fn try_bind(self) -> crate::Result<Self::Acceptor> {
        Ok(RustlsAcceptor::new(
            self.config_stream.into_stream().boxed(),
            self.inner.try_bind().await?,
        ))
    }
}

/// A wrapper of `Acceptor` with rustls.
pub struct RustlsAcceptor<S, C, T, E> {
    config_stream: S,
    inner: T,
    holdings: Vec<Holding>,
    tls_acceptor: Option<tokio_rustls::TlsAcceptor>,
    _phantom: PhantomData<(C, E)>,
}
impl<S, C, T, E> RustlsAcceptor<S, C, T, E>
where
    S: Stream<Item = C> + Send + 'static,
    C: TryInto<ServerConfig, Error = E> + Send + 'static,
    T: Acceptor + Send,
    E: StdError + Send,
{
    /// Create a new `RustlsAcceptor`.
    pub fn new(config_stream: S, inner: T) -> RustlsAcceptor<S, C, T, E> {
        let holdings = inner
            .holdings()
            .iter()
            .map(|h| {
                let mut versions = h.http_versions.clone();
                #[cfg(feature = "http1")]
                if !versions.contains(&Version::HTTP_11) {
                    versions.push(Version::HTTP_11);
                }
                #[cfg(feature = "http2")]
                if !versions.contains(&Version::HTTP_2) {
                    versions.push(Version::HTTP_2);
                }
                Holding {
                    local_addr: h.local_addr.clone(),
                    http_versions: versions,
                    http_scheme: Scheme::HTTPS,
                }
            })
            .collect();
        RustlsAcceptor {
            config_stream,
            inner,
            holdings,
            tls_acceptor: None,
            _phantom: PhantomData,
        }
    }

    /// Get the inner `Acceptor`.
    pub fn inner(&self) -> &T {
        &self.inner
    }
}

impl<S, C, T, E> Acceptor for RustlsAcceptor<S, C, T, E>
where
    S: Stream<Item = C> + Send + Unpin + 'static,
    C: TryInto<ServerConfig, Error = E> + Send + 'static,
    T: Acceptor + Send + 'static,
    <T as Acceptor>::Conn: AsyncRead + AsyncWrite + Send + Unpin + 'static,
    E: StdError + Send,
{
    type Conn = HandshakeStream<TlsStream<T::Conn>>;

    fn holdings(&self) -> &[Holding] {
        &self.holdings
    }

    async fn accept(&mut self, fuse_factory: Option<ArcFuseFactory>) -> IoResult<Accepted<Self::Conn>> {
        let config = {
            let mut config = None;
            while let Poll::Ready(Some(item)) =
                Pin::new(&mut self.config_stream).poll_next(&mut Context::from_waker(noop_waker_ref()))
            {
                config = Some(item);
            }
            config
        };
        if let Some(config) = config {
            let config: ServerConfig = config
                .try_into()
                .map_err(|e| IoError::new(ErrorKind::Other, e.to_string()))?;
            let tls_acceptor = tokio_rustls::TlsAcceptor::from(Arc::new(config));
            if self.tls_acceptor.is_some() {
                tracing::info!("tls config changed.");
            } else {
                tracing::info!("tls config loaded.");
            }
            self.tls_acceptor = Some(tls_acceptor);
        }
        let tls_acceptor = match &self.tls_acceptor {
            Some(tls_acceptor) => tls_acceptor,
            None => return Err(IoError::new(ErrorKind::Other, "rustls: invalid tls config.")),
        };

        let Accepted {
            conn,
            local_addr,
            remote_addr,
            ..
        } = self.inner.accept(fuse_factory).await?;
        let fusewire = conn.fusewire();
        Ok(Accepted {
            conn: HandshakeStream::new(tls_acceptor.accept(conn), fusewire),
            local_addr,
            remote_addr,
            http_scheme: Scheme::HTTPS,
        })
    }
}