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
use std::fmt;
use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};

use hyper::{client::connect::HttpConnector, service::Service, Uri};
use tokio::io::{AsyncRead, AsyncWrite};
use tokio_native_tls::TlsConnector;

use crate::stream::MaybeHttpsStream;

type BoxError = Box<dyn std::error::Error + Send + Sync>;

/// A Connector for the `https` scheme.
#[derive(Clone)]
pub struct HttpsConnector<T> {
    force_https: bool,
    http: T,
    tls: TlsConnector,
}

impl HttpsConnector<HttpConnector> {
    /// Construct a new HttpsConnector.
    ///
    /// This uses hyper's default `HttpConnector`, and default `TlsConnector`.
    /// If you wish to use something besides the defaults, use `From::from`.
    ///
    /// # Note
    ///
    /// By default this connector will use plain HTTP if the URL provded uses
    /// the HTTP scheme (eg: http://example.com/).
    ///
    /// If you would like to force the use of HTTPS then call https_only(true)
    /// on the returned connector.
    ///
    /// # Panics
    ///
    /// This will panic if the underlying TLS context could not be created.
    ///
    /// To handle that error yourself, you can use the `HttpsConnector::from`
    /// constructor after trying to make a `TlsConnector`.
    pub fn new() -> Self {
        native_tls::TlsConnector::new()
            .map(|tls| HttpsConnector::new_(tls.into()))
            .unwrap_or_else(|e| panic!("HttpsConnector::new() failure: {}", e))
    }

    fn new_(tls: TlsConnector) -> Self {
        let mut http = HttpConnector::new();
        http.enforce_http(false);
        HttpsConnector::from((http, tls))
    }
}

impl<T: Default> Default for HttpsConnector<T> {
    fn default() -> Self {
        Self::new_with_connector(Default::default())
    }
}

impl<T> HttpsConnector<T> {
    /// Force the use of HTTPS when connecting.
    ///
    /// If a URL is not `https` when connecting, an error is returned.
    pub fn https_only(&mut self, enable: bool) {
        self.force_https = enable;
    }

    /// With connector constructor
    ///
    pub fn new_with_connector(http: T) -> Self {
        native_tls::TlsConnector::new()
            .map(|tls| HttpsConnector::from((http, tls.into())))
            .unwrap_or_else(|e| {
                panic!(
                    "HttpsConnector::new_with_connector(<connector>) failure: {}",
                    e
                )
            })
    }
}

impl<T> From<(T, TlsConnector)> for HttpsConnector<T> {
    fn from(args: (T, TlsConnector)) -> HttpsConnector<T> {
        HttpsConnector {
            force_https: false,
            http: args.0,
            tls: args.1,
        }
    }
}

impl<T: fmt::Debug> fmt::Debug for HttpsConnector<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("HttpsConnector")
            .field("force_https", &self.force_https)
            .field("http", &self.http)
            .finish()
    }
}

impl<T> Service<Uri> for HttpsConnector<T>
where
    T: Service<Uri>,
    T::Response: AsyncRead + AsyncWrite + Send + Unpin,
    T::Future: Send + 'static,
    T::Error: Into<BoxError>,
{
    type Response = MaybeHttpsStream<T::Response>;
    type Error = BoxError;
    type Future = HttpsConnecting<T::Response>;

    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        match self.http.poll_ready(cx) {
            Poll::Ready(Ok(())) => Poll::Ready(Ok(())),
            Poll::Ready(Err(e)) => Poll::Ready(Err(e.into())),
            Poll::Pending => Poll::Pending,
        }
    }

    fn call(&mut self, dst: Uri) -> Self::Future {
        let is_https = dst.scheme_str() == Some("https");
        // Early abort if HTTPS is forced but can't be used
        if !is_https && self.force_https {
            return err(ForceHttpsButUriNotHttps.into());
        }

        let host = dst
            .host()
            .unwrap_or("")
            .trim_matches(|c| c == '[' || c == ']')
            .to_owned();
        let connecting = self.http.call(dst);
        let tls = self.tls.clone();
        let fut = async move {
            let tcp = connecting.await.map_err(Into::into)?;
            let maybe = if is_https {
                let tls = tls.connect(&host, tcp).await?;
                MaybeHttpsStream::Https(tls)
            } else {
                MaybeHttpsStream::Http(tcp)
            };
            Ok(maybe)
        };
        HttpsConnecting(Box::pin(fut))
    }
}

fn err<T>(e: BoxError) -> HttpsConnecting<T> {
    HttpsConnecting(Box::pin(async { Err(e) }))
}

type BoxedFut<T> = Pin<Box<dyn Future<Output = Result<MaybeHttpsStream<T>, BoxError>> + Send>>;

/// A Future representing work to connect to a URL, and a TLS handshake.
pub struct HttpsConnecting<T>(BoxedFut<T>);

impl<T: AsyncRead + AsyncWrite + Unpin> Future for HttpsConnecting<T> {
    type Output = Result<MaybeHttpsStream<T>, BoxError>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        Pin::new(&mut self.0).poll(cx)
    }
}

impl<T> fmt::Debug for HttpsConnecting<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.pad("HttpsConnecting")
    }
}

// ===== Custom Errors =====

#[derive(Debug)]
struct ForceHttpsButUriNotHttps;

impl fmt::Display for ForceHttpsButUriNotHttps {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str("https required but URI was not https")
    }
}

impl std::error::Error for ForceHttpsButUriNotHttps {}