aws-sdk-rust 0.1.42

/*
 Copyright 2017 LambdaStack All rights reserved.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
*/

// Copyright (c) 2016 Chef Software Inc. and/or applicable contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::io::{Read, Write};

use httparse;
use hyper;
use hyper::method::Method;
use hyper::version::HttpVersion;
use hyper::net::{HttpConnector, HttpsStream, NetworkConnector, SslClient};

use http::client::proxy::Proxy;

/// A connector that uses an HTTP proxy server (pass-through for plaintext and tunneled for SSL
/// sessions).
pub struct ProxyHttpsConnector<S: SslClient> {
    proxy: Proxy,
    proxy_connector: HttpConnector,
    ssl_client: S,
}

impl<S: SslClient> ProxyHttpsConnector<S> {
    /// Creates a new connection using the provided proxy server configuration and SSL
    /// implementation.
    pub fn new(proxy: Proxy, ssl: S) -> hyper::Result<Self> {
        Ok(ProxyHttpsConnector {
            proxy: proxy,
            proxy_connector: HttpConnector,
            ssl_client: ssl,
        })
    }
}

impl<S: SslClient> NetworkConnector for ProxyHttpsConnector<S> {
    type Stream = HttpsStream<S::Stream>;

    fn connect(&self, host: &str, port: u16, scheme: &str) -> hyper::Result<Self::Stream> {
        // Initial connection to the proxy server, using an `HttpConnector`
        let mut stream = try!(self.proxy_connector
            .connect(self.proxy.host(), self.proxy.port(), "http"));
        match scheme {
            "https" => {
                // If the target URL is an `"https"` scheme, then we use proxy/TCP tunneling as
                // per the RFC draft:
                // http://www.web-cache.com/Writings/Internet-Drafts/draft-luotonen-web-proxy-tunneling-01.txt
                //
                // We can't yet use hyper directly and therefore use the underlying http parsing
                // library to establish the connection and parse the response. This implementation
                // is largely based on hyper's internal proxy tunneling code.
                let mut connect_msg = format!("{method} {host}:{port} {version}\r\nHost \
                                               {host}:{port}\r\n",
                                              method = Method::Connect,
                                              version = HttpVersion::Http11,
                                              host = host,
                                              port = port);
                if let Some(header_value) = self.proxy.authorization_header_value() {
                    connect_msg.push_str(&format!("Proxy-Authorization: {}\r\n", header_value));
                };
                connect_msg.push_str("\r\n");
                debug!("Proxy {}:{} {:?}",
                       self.proxy.host(),
                       self.proxy.port(),
                       connect_msg.trim().replace("\r\n", ", "));
                try!(stream.write_all(connect_msg.as_bytes()));
                try!(stream.flush());
                let mut buf = [0; 1024];
                let mut n = 0;
                while n < buf.len() {
                    n += try!(stream.read(&mut buf[n..]));
                    let mut headers = [httparse::EMPTY_HEADER; 10];
                    let mut res = httparse::Response::new(&mut headers);
                    if try!(res.parse(&buf[..n])).is_complete() {
                        let code = res.code.expect("complete parsing lost code");
                        if code >= 200 && code < 300 {
                            debug!("Proxy {}:{} CONNECT success = {}",
                                   self.proxy.host(),
                                   self.proxy.port(),
                                   code);
                            return self.ssl_client
                                .wrap_client(stream, host)
                                .map(HttpsStream::Https);
                        } else {
                            debug!("Proxy {}:{} CONNECT failed response = {}",
                                   self.proxy.host(),
                                   self.proxy.port(),
                                   code);
                            return Err(hyper::Error::Status);
                        }
                    }
                }
                Err(hyper::Error::TooLarge)
            }
            _ => Ok(HttpsStream::Http(stream)),
        }
    }
}