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/target/
**/*.rs.bk
Cargo.lock

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language: rust
rust:
- stable
- beta
- nightly

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[package]
name = "hyper-reverse-proxy"
version = "0.1.0"
authors = ["Brendan Zabarauskas <bjzaba@yahoo.com.au>"]
license = "Apache-2.0"
description = "A simple reverse proxy, to be used with Hyper and Tokio."
homepage = "https://github.com/brendanzab/hyper-reverse-proxy"
documentation = "https://docs.rs/hyper-reverse-proxy"
repository = "https://github.com/brendanzab/hyper-reverse-proxy"
keywords = ["http", "hyper"]
categories = ["network-programming", "web-programming"]
readme = "README.md"
include = [
"Cargo.toml",
"LICENSE",
"src/**/*"
]
[dependencies]
futures = "0.1.14"
hyper = "0.11.0"
lazy_static = "0.2"
unicase = "2.0.0"
void = "1.0.2"

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# hyper-reverse-proxy
[![Build Status](https://travis-ci.org/brendanzab/hyper-reverse-proxy.svg?branch=master)](https://travis-ci.org/brendanzab/hyper-reverse-proxy)
[![Documentation](https://docs.rs/hyper-reverse-proxy/badge.svg)](https://docs.rs/hyper-reverse-proxy)
[![Version](https://img.shields.io/crates/v/hyper-reverse-proxy.svg)](https://crates.io/crates/hyper-reverse-proxy)
[![License](https://img.shields.io/crates/l/hyper-reverse-proxy.svg)](https://github.com/brendanzab/hyper-reverse-proxy/blob/master/LICENSE)
A simple reverse proxy, to be used with Hyper and Tokio.
The implementation was originally based on Go's [`httputil.ReverseProxy`].
[`httputil.ReverseProxy`]: https://golang.org/pkg/net/http/httputil/#ReverseProxy

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//! A simple reverse proxy, to be used with Hyper and Tokio.
extern crate futures;
#[macro_use]
extern crate hyper;
#[macro_use]
extern crate lazy_static;
extern crate unicase;
extern crate void;
use futures::future::Future;
use hyper::{Body, Request, Response, StatusCode};
use hyper::server::Service;
use hyper::header::Headers;
use std::marker::PhantomData;
use std::net::IpAddr;
use void::Void;
fn is_hop_header(name: &str) -> bool {
use unicase::Ascii;
// A list of the headers, using `unicase` to help us compare without
// worrying about the case, and `lazy_static!` to prevent reallocation
// of the vector.
lazy_static! {
static ref HOP_HEADERS: Vec<Ascii<&'static str>> = vec![
Ascii::new("Connection"),
Ascii::new("Keep-Alive"),
Ascii::new("Proxy-Authenticate"),
Ascii::new("Proxy-Authorization"),
Ascii::new("Te"),
Ascii::new("Trailers"),
Ascii::new("Transfer-Encoding"),
Ascii::new("Upgrade"),
];
}
HOP_HEADERS.iter().any(|h| h == &name)
}
/// Returns a clone of the headers without the [hop-by-hop headers].
///
/// [hop-by-hop headers]: http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html
fn remove_hop_headers(headers: &Headers) -> Headers {
headers
.iter()
.filter(|header| is_hop_header(header.name()))
.collect()
}
// TODO: use https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Forwarded ?
header! {
/// `X-Forwarded-For` header.
///
/// The `X-Forwarded-For` header describes the path of
/// proxies this request has been forwarded through.
///
/// # Example Values
///
/// * `2001:db8:85a3:8d3:1319:8a2e:370:7348`
/// * `203.0.113.195`
/// * `203.0.113.195, 70.41.3.18, 150.172.238.178`
///
/// # References
///
/// - [MDN](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For)
/// - [Wikipedia](https://en.wikipedia.org/wiki/X-Forwarded-For)
(XForwardedFor, "X-Forwarded-For") => (IpAddr)+
// test_x_forwarded_for {
// // Testcases from MDN
// test_header!(test1, vec![b"2001:db8:85a3:8d3:1319:8a2e:370:7348"]);
// test_header!(test2, vec![b"203.0.113.195"]);
// test_header!(test3, vec![b"203.0.113.195, 70.41.3.18, 150.172.238.178"]);
// }
}
fn create_proxied_response<B>(mut response: Response<B>) -> Response<B> {
*response.headers_mut() = remove_hop_headers(response.headers());
response
}
/// A `Service` that takes an incoming request, sends it to a given `Client`, then proxies back
/// the response.
///
/// The implementation ensures that [Hop-by-hop headers] are stripped correctly in both directions,
/// and adds the client's IP address to a comma-space-separated list of forwarding addresses in the
/// `X-Forwarded-For` header.
///
/// The implementation is based on Go's [`httputil.ReverseProxy`].
///
/// [Hop-by-hop headers]: http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html
/// [`httputil.ReverseProxy`]: https://golang.org/pkg/net/http/httputil/#ReverseProxy
pub struct ReverseProxy<C: Service, B = Body> {
client: C,
remote_ip_addr: Option<IpAddr>,
_pantom_data: PhantomData<B>,
}
impl<C: Service, B> ReverseProxy<C, B> {
/// Construct a reverse proxy that dispatches to the given client.
pub fn new(client: C, remote_ip_addr: Option<IpAddr>) -> ReverseProxy<C, B> {
ReverseProxy {
client,
remote_ip_addr,
_pantom_data: PhantomData,
}
}
fn create_proxied_request(&self, mut request: Request<B>) -> Request<B> {
*request.headers_mut() = remove_hop_headers(request.headers());
// Add forwarding information in the headers
if let Some(ip_addr) = self.remote_ip_addr {
// This is kind of ugly because of borrowing. Maybe hyper's `Headers` object
// could use an entry API like `std::collections::HashMap`?
if request.headers().has::<XForwardedFor>() {
if let Some(prior) = request.headers_mut().get_mut::<XForwardedFor>() {
prior.0.push(ip_addr);
}
} else {
let header = XForwardedFor(vec![ip_addr]);
request.headers_mut().set(header);
}
}
request
}
}
impl<C, B> Service for ReverseProxy<C, B>
where
B: 'static,
C: Service<Request = Request<B>, Response = Response<B>>,
C::Error: 'static + std::fmt::Display,
C::Future: 'static,
{
type Request = Request<B>;
type Response = Response<B>;
type Error = Void;
type Future = Box<Future<Item = Response<B>, Error = Void>>;
fn call(&self, request: Self::Request) -> Self::Future {
let proxied_request = self.create_proxied_request(request);
Box::new(self.client.call(proxied_request).then(|response| {
Ok(match response {
Ok(response) => create_proxied_response(response),
Err(error) => {
println!("Error: {}", error); // TODO: Configurable logging
Response::new().with_status(StatusCode::InternalServerError)
// TODO: handle trailers
}
})
}))
}
}

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extern crate futures;
#[macro_use]
extern crate hyper;
extern crate hyper_reverse_proxy;
use futures::future::{self, Future, FutureResult};
use hyper::{Get, Request, Response};
use hyper::server::Service;
use hyper_reverse_proxy::ReverseProxy;
struct MockService<F: Fn(Request) -> Response>(F);
impl<F: Fn(Request) -> Response> Service for MockService<F> {
type Request = Request;
type Response = Response;
type Error = hyper::Error;
type Future = FutureResult<Response, hyper::Error>;
fn call(&self, request: Self::Request) -> Self::Future {
future::ok((self.0)(request))
}
}
#[test]
#[ignore]
fn adds_forwarded_for_header() {
// TODO: https://github.com/hyperium/hyper/issues/1258
unimplemented!()
}
#[test]
fn forwards_the_bodies() {
use futures::Stream;
let mut request = Request::new(Get, "/".parse().unwrap());
request.set_body("request");
let service = ReverseProxy::new(MockService(|request| {
let body = request.body().concat2().wait().unwrap();
assert_eq!(body.as_ref(), b"request");
Response::new().with_body("response")
}));
let response = service.call(request).wait().unwrap();
let body = response.body().concat2().wait().unwrap();
assert_eq!(body.as_ref(), b"response");
}
#[test]
fn clones_headers() {
header! { (XTestHeader1, "X-Test-Header1") => [String] }
header! { (XTestHeader2, "X-Test-Header2") => [String] }
let mut request = Request::new(Get, "/".parse().unwrap());
request.headers_mut().set(XTestHeader1("Test1".to_owned()));
request.headers_mut().set(XTestHeader2("Test2".to_owned()));
let service = ReverseProxy::new(MockService(|request| {
let header1 = request.headers().get::<XTestHeader1>().unwrap();
let header2 = request.headers().get::<XTestHeader2>().unwrap();
assert_eq!(header1, &XTestHeader1("Test1".to_owned()));
assert_eq!(header2, &XTestHeader2("Test2".to_owned()));
Response::new()
}));
service.call(request).wait().unwrap();
}
#[test]
fn removes_request_hop_headers() {
use hyper::header::{Connection, TransferEncoding, Upgrade};
let mut request = Request::new(Get, "/".parse().unwrap());
request.headers_mut().set(Connection(vec![]));
request.headers_mut().set_raw("Keep-Alive", "");
request.headers_mut().set_raw("Proxy-Authenticate", "");
request.headers_mut().set_raw("Proxy-Authorization", "");
request.headers_mut().set_raw("TE", "");
request.headers_mut().set_raw("Trailers", "");
request.headers_mut().set(TransferEncoding(vec![]));
request.headers_mut().set(Upgrade(vec![]));
let service = ReverseProxy::new(MockService(|request| {
assert_eq!(request.headers().get::<Connection>(), None);
assert_eq!(request.headers().get_raw("Keep-Alive"), None);
assert_eq!(request.headers().get_raw("Proxy-Authenticate"), None);
assert_eq!(request.headers().get_raw("Proxy-Authorization"), None);
assert_eq!(request.headers().get_raw("TE"), None);
assert_eq!(request.headers().get_raw("Trailers"), None);
assert_eq!(request.headers().get::<TransferEncoding>(), None);
assert_eq!(request.headers().get::<Upgrade>(), None);
Response::new()
}));
service.call(request).wait().unwrap();
}
#[test]
fn removes_response_hop_headers() {
use hyper::header::{Connection, TransferEncoding, Upgrade};
let request = Request::new(Get, "/".parse().unwrap());
let service = ReverseProxy::new(MockService(|_| {
let mut response = Response::new();
response.headers_mut().set(Connection(vec![]));
response.headers_mut().set_raw("Keep-Alive", "");
response.headers_mut().set_raw("Proxy-Authenticate", "");
response.headers_mut().set_raw("Proxy-Authorization", "");
response.headers_mut().set_raw("TE", "");
response.headers_mut().set_raw("Trailers", "");
response.headers_mut().set(TransferEncoding(vec![]));
response.headers_mut().set(Upgrade(vec![]));
response
}));
let response = service.call(request).wait().unwrap();
assert_eq!(response.headers().get::<Connection>(), None);
assert_eq!(response.headers().get_raw("Keep-Alive"), None);
assert_eq!(response.headers().get_raw("Proxy-Authenticate"), None);
assert_eq!(response.headers().get_raw("Proxy-Authorization"), None);
assert_eq!(response.headers().get_raw("TE"), None);
assert_eq!(response.headers().get_raw("Trailers"), None);
assert_eq!(response.headers().get::<TransferEncoding>(), None);
assert_eq!(response.headers().get::<Upgrade>(), None);
}