works

2 files changed, 173 insertions, 0 deletions

diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..527e159
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,34 @@
+use std::{collections::HashMap, fs::read_to_string, net::SocketAddr, path::PathBuf};
+
+use anyhow::Context;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Config {
+    pub http: Option<HttpConfig>,
+    pub https: Option<HttpsConfig>,
+    pub hosts: HashMap<String, HostConfig>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct HttpConfig {
+    pub bind: SocketAddr,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct HttpsConfig {
+    pub bind: SocketAddr,
+    pub tls_cert: PathBuf,
+    pub tls_key: PathBuf,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct HostConfig {}
+
+impl Config {
+    pub fn load() -> anyhow::Result<Config> {
+        let raw = read_to_string("config.toml").context("reading config file")?;
+        let config: Config = toml::from_str(&raw).context("parsing config")?;
+        Ok(config)
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..583a069
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,139 @@
+pub mod config;
+
+use crate::config::Config;
+use anyhow::{bail, Context, Result};
+use bytes::Bytes;
+use http_body_util::{combinators::BoxBody, BodyExt, Empty};
+use hyper::{body::Incoming, server::conn::http1, service::service_fn, Method, Request, Response};
+use log::{debug, error, info};
+use std::{fs::File, io::BufReader, path::Path, sync::Arc};
+use tokio::{
+    io::{AsyncRead, AsyncWrite},
+    net::{TcpListener, TcpStream},
+};
+use tokio_rustls::TlsAcceptor;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    env_logger::init_from_env("LOG");
+
+    let config = Arc::new(Config::load()?);
+
+    tokio::select! {
+        x = serve_http(config.clone()) => x.context("serving http")?,
+        x = serve_https(config.clone()) => x.context("serving https")?,
+    };
+    Ok(())
+}
+
+async fn serve_http(config: Arc<Config>) -> Result<()> {
+    let http_config = match &config.http {
+        Some(n) => n,
+        None => return Ok(()),
+    };
+    let listener = TcpListener::bind(http_config.bind).await?;
+    info!("serving http");
+    loop {
+        let (stream, addr) = listener.accept().await.context("accepting connection")?;
+        debug!("connection from {addr}");
+        serve_stream(config.clone(), stream)
+    }
+}
+async fn serve_https(config: Arc<Config>) -> Result<()> {
+    let https_config = match &config.https {
+        Some(n) => n,
+        None => return Ok(()),
+    };
+    let tls_config = {
+        let certs = load_certs(&https_config.tls_cert)?;
+        let key = load_private_key(&https_config.tls_key)?;
+        let mut cfg = rustls::ServerConfig::builder()
+            .with_safe_defaults()
+            .with_no_client_auth()
+            .with_single_cert(certs, key)?;
+        cfg.alpn_protocols = vec![
+            // b"h2".to_vec(),
+            b"http/1.1".to_vec(),
+        ];
+        Arc::new(cfg)
+    };
+    let listener = TcpListener::bind(https_config.bind).await?;
+    let tls_acceptor = TlsAcceptor::from(tls_config);
+
+    info!("serving https");
+    loop {
+        let (stream, addr) = listener.accept().await.context("accepting connection")?;
+        debug!("connection from {addr}");
+        let stream = tls_acceptor.accept(stream).await.context("accepting tls")?;
+        serve_stream(config.clone(), stream)
+    }
+}
+
+pub fn serve_stream<T: AsyncRead + AsyncWrite + Unpin + Send + 'static>(
+    config: Arc<Config>,
+    stream: T,
+) {
+    tokio::task::spawn(async move {
+        if let Err(err) = http1::Builder::new()
+            .serve_connection(stream, service_fn(move |req| service(config.clone(), req)))
+            .await
+        {
+            error!("{:?}", err);
+        }
+    });
+}
+
+fn load_certs(path: &Path) -> anyhow::Result<Vec<rustls::Certificate>> {
+    let mut reader = BufReader::new(File::open(path).context("reading tls certs")?);
+    let certs = rustls_pemfile::certs(&mut reader).context("parsing tls certs")?;
+    Ok(certs.into_iter().map(rustls::Certificate).collect())
+}
+fn load_private_key(path: &Path) -> anyhow::Result<rustls::PrivateKey> {
+    let mut reader = BufReader::new(File::open(path).context("reading tls private key")?);
+    let keys =
+        rustls_pemfile::pkcs8_private_keys(&mut reader).context("parsing tls private key")?;
+    if keys.len() != 1 {
+        bail!("expected a single private key, found {}", keys.len())
+    }
+    Ok(rustls::PrivateKey(keys[0].clone()))
+}
+
+async fn service(
+    config: Arc<Config>,
+    mut req: Request<Incoming>,
+) -> Result<hyper::Response<BoxBody<bytes::Bytes, hyper::Error>>, hyper::Error> {
+    let uri_string = format!(
+        "http://127.0.0.1:8080{}",
+        req.uri()
+            .path_and_query()
+            .map(|x| x.as_str())
+            .unwrap_or("/")
+    );
+    let uri = uri_string.parse().unwrap();
+    *req.uri_mut() = uri;
+
+    let host = req.uri().host().expect("uri has no host");
+    let port = req.uri().port_u16().unwrap_or(80);
+    let addr = format!("{}:{}", host, port);
+
+    let client_stream = TcpStream::connect(addr).await.unwrap();
+
+    if req.method() == Method::CONNECT {
+        Ok(Response::new(empty()))
+    } else {
+        let (mut sender, conn) = hyper::client::conn::http1::handshake(client_stream).await?;
+        tokio::task::spawn(async move {
+            if let Err(err) = conn.await {
+                println!("Connection failed: {:?}", err);
+            }
+        });
+        let resp = sender.send_request(req).await?;
+        Ok(resp.map(|b| b.boxed()))
+    }
+}
+
+fn empty() -> BoxBody<Bytes, hyper::Error> {
+    Empty::<Bytes>::new()
+        .map_err(|never| match never {})
+        .boxed()
+}