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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
use async_rustls::{client::TlsStream, webpki::DNSNameRef, TlsConnector};
use rustls::{ClientConfig, RootCertStore};
use std::{
    fmt::{self, Debug, Formatter},
    future::Future,
    io::{Error, ErrorKind, Result},
    marker::PhantomData,
    net::SocketAddr,
    pin::Pin,
    sync::Arc,
    task::{Context, Poll},
};
use trillium_tls_common::{async_trait, AsyncRead, AsyncWrite, Connector, Url};
use RustlsTransportInner::{Tcp, Tls};

/**
this struct provides rustls a trillium client connector implementation
*/
#[derive(Debug, Clone, Copy)]
pub struct RustlsConnector<C>(PhantomData<C>);

#[derive(Debug)]
enum RustlsTransportInner<T> {
    Tcp(T),
    Tls(TlsStream<T>),
}

/**
Transport for the rustls connector

This may represent either an encrypted tls connection or a plaintext
connection, depending on the request schema
*/
#[derive(Debug)]
pub struct RustlsTransport<T>(RustlsTransportInner<T>);

/**
Client configuration for RustlsConnector
*/
#[derive(Clone)]
pub struct RustlsConfig<Config> {
    /// configuration for rustls itself
    pub rustls_config: Arc<ClientConfig>,

    /// configuration for the inner transport
    pub tcp_config: Config,
}

impl<Config: Default> Default for RustlsConfig<Config> {
    fn default() -> Self {
        let mut root_store = RootCertStore::empty();
        match rustls_native_certs::load_native_certs() {
            Ok(certs) => {
                for cert in certs {
                    if let Err(e) = root_store.add(&rustls::Certificate(cert.0)) {
                        log::debug!("unable to add certificate {:?}, skipping", e);
                    }
                }
            }

            Err(e) => {
                log::warn!(
                    "rustls native certs hard error, falling back to webpki roots: {:?}",
                    e
                );
                root_store.add_server_trust_anchors(&webpki_roots::TLS_SERVER_ROOTS);
            }
        };

        let mut config = ClientConfig::new();
        config.root_store = root_store;
        config.into()
    }
}

impl<Config: Default> From<ClientConfig> for RustlsConfig<Config> {
    fn from(rustls_config: ClientConfig) -> Self {
        Self {
            rustls_config: Arc::new(rustls_config),
            tcp_config: Config::default(),
        }
    }
}

impl<Config: Debug> Debug for RustlsConfig<Config> {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        f.debug_struct("RustlsConfig")
            .field("rustls_config", &"..")
            .field("tcp_config", &self.tcp_config)
            .finish()
    }
}

impl<C> AsyncRead for RustlsTransport<C>
where
    C: AsyncRead + AsyncWrite + Unpin,
{
    fn poll_read(
        mut self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut [u8],
    ) -> Poll<Result<usize>> {
        match &mut self.0 {
            Tcp(c) => Pin::new(c).poll_read(cx, buf),
            Tls(c) => Pin::new(c).poll_read(cx, buf),
        }
    }
}

impl<C> AsyncWrite for RustlsTransport<C>
where
    C: AsyncRead + AsyncWrite + Unpin,
{
    fn poll_write(
        mut self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<Result<usize>> {
        match &mut self.0 {
            Tcp(c) => Pin::new(c).poll_write(cx, buf),
            Tls(c) => Pin::new(c).poll_write(cx, buf),
        }
    }

    fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
        match &mut self.0 {
            Tcp(c) => Pin::new(c).poll_flush(cx),
            Tls(c) => Pin::new(c).poll_flush(cx),
        }
    }

    fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
        match &mut self.0 {
            Tcp(c) => Pin::new(c).poll_close(cx),
            Tls(c) => Pin::new(c).poll_close(cx),
        }
    }
}

#[async_trait]
impl<C: Connector> Connector for RustlsConnector<C> {
    type Config = RustlsConfig<C::Config>;
    type Transport = RustlsTransport<C::Transport>;
    fn peer_addr(transport: &Self::Transport) -> Result<SocketAddr> {
        match &transport.0 {
            Tcp(c) => C::peer_addr(c),
            Tls(c) => {
                let (x, _) = c.get_ref();
                C::peer_addr(x)
            }
        }
    }

    async fn connect(url: &Url, config: &Self::Config) -> Result<Self::Transport> {
        match url.scheme() {
            "https" => {
                let mut http = url.clone();
                http.set_scheme("http").ok();
                http.set_port(url.port_or_known_default()).ok();

                let connector: TlsConnector = Arc::clone(&config.rustls_config).into();
                let domain = url
                    .domain()
                    .and_then(|dns_name| DNSNameRef::try_from_ascii_str(dns_name).ok())
                    .ok_or_else(|| Error::new(ErrorKind::Other, "missing domain"))?;

                Ok(RustlsTransport(Tls(connector
                    .connect(domain, C::connect(&http, &config.tcp_config).await?)
                    .await
                    .map_err(|e| {
                        Error::new(ErrorKind::Other, e.to_string())
                    })?)))
            }

            "http" => Ok(RustlsTransport(Tcp(
                C::connect(url, &config.tcp_config).await?
            ))),

            unknown => Err(Error::new(
                ErrorKind::InvalidInput,
                format!("unknown scheme {}", unknown),
            )),
        }
    }

    fn spawn<Fut>(future: Fut)
    where
        Fut: Future + Send + 'static,
        <Fut as Future>::Output: Send,
    {
        C::spawn(future);
    }
}