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main.rs
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main.rs
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use std::net::ToSocketAddrs;
use actix_web::{
dev::PeerAddr, error, http::Method, middleware, web, App, Error, HttpRequest, HttpResponse,
HttpServer,
};
use awc::Client;
use clap::Parser;
use futures_util::StreamExt as _;
use tokio::sync::mpsc;
use tokio_stream::wrappers::UnboundedReceiverStream;
use url::Url;
const REQWEST_PREFIX: &str = "/using-reqwest";
/// Forwards the incoming HTTP request using `awc`.
async fn forward(
req: HttpRequest,
payload: web::Payload,
peer_addr: Option<PeerAddr>,
url: web::Data<Url>,
client: web::Data<Client>,
) -> Result<HttpResponse, Error> {
let mut new_url = (**url).clone();
new_url.set_path(req.uri().path());
new_url.set_query(req.uri().query());
let forwarded_req = client
.request_from(new_url.as_str(), req.head())
.no_decompress();
// TODO: This forwarded implementation is incomplete as it only handles the unofficial
// X-Forwarded-For header but not the official Forwarded one.
let forwarded_req = match peer_addr {
Some(PeerAddr(addr)) => {
forwarded_req.insert_header(("x-forwarded-for", addr.ip().to_string()))
}
None => forwarded_req,
};
let res = forwarded_req
.send_stream(payload)
.await
.map_err(error::ErrorInternalServerError)?;
let mut client_resp = HttpResponse::build(res.status());
// Remove `Connection` as per
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Connection#Directives
for (header_name, header_value) in res.headers().iter().filter(|(h, _)| *h != "connection") {
client_resp.insert_header((header_name.clone(), header_value.clone()));
}
Ok(client_resp.streaming(res))
}
/// Same as `forward` but uses `reqwest` as the client used to forward the request.
async fn forward_reqwest(
req: HttpRequest,
mut payload: web::Payload,
method: Method,
peer_addr: Option<PeerAddr>,
url: web::Data<Url>,
client: web::Data<reqwest::Client>,
) -> Result<HttpResponse, Error> {
let path = req
.uri()
.path()
.strip_prefix(REQWEST_PREFIX)
.unwrap_or(req.uri().path());
let mut new_url = (**url).clone();
new_url.set_path(path);
new_url.set_query(req.uri().query());
let (tx, rx) = mpsc::unbounded_channel();
actix_web::rt::spawn(async move {
while let Some(chunk) = payload.next().await {
tx.send(chunk).unwrap();
}
});
let forwarded_req = client
.request(method, new_url)
.body(reqwest::Body::wrap_stream(UnboundedReceiverStream::new(rx)));
// TODO: This forwarded implementation is incomplete as it only handles the unofficial
// X-Forwarded-For header but not the official Forwarded one.
let forwarded_req = match peer_addr {
Some(PeerAddr(addr)) => forwarded_req.header("x-forwarded-for", addr.ip().to_string()),
None => forwarded_req,
};
let res = forwarded_req
.send()
.await
.map_err(error::ErrorInternalServerError)?;
let mut client_resp = HttpResponse::build(res.status());
// Remove `Connection` as per
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Connection#Directives
for (header_name, header_value) in res.headers().iter().filter(|(h, _)| *h != "connection") {
client_resp.insert_header((header_name.clone(), header_value.clone()));
}
Ok(client_resp.streaming(res.bytes_stream()))
}
#[derive(clap::Parser, Debug)]
struct CliArguments {
listen_addr: String,
listen_port: u16,
forward_addr: String,
forward_port: u16,
}
#[actix_web::main]
async fn main() -> std::io::Result<()> {
env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
let args = CliArguments::parse();
let forward_socket_addr = (args.forward_addr, args.forward_port)
.to_socket_addrs()?
.next()
.expect("given forwarding address was not valid");
let forward_url = format!("http://{forward_socket_addr}");
let forward_url = Url::parse(&forward_url).unwrap();
log::info!(
"starting HTTP server at http://{}:{}",
&args.listen_addr,
args.listen_port
);
log::info!("forwarding to {forward_url}");
let reqwest_client = reqwest::Client::default();
HttpServer::new(move || {
App::new()
.app_data(web::Data::new(Client::default()))
.app_data(web::Data::new(reqwest_client.clone()))
.app_data(web::Data::new(forward_url.clone()))
.wrap(middleware::Logger::default())
.service(web::scope(REQWEST_PREFIX).default_service(web::to(forward_reqwest)))
.default_service(web::to(forward))
})
.bind((args.listen_addr, args.listen_port))?
.workers(2)
.run()
.await
}