add majsite server example

Cargo.toml

@@ -7,24 +7,38 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+async-trait = { version = "0", optional = true }
 num = "0.2"
 num-derive = "0.3"
 num-traits = "0.2"
 rustls = { version = "0.18", optional = true, features = ["dangerous_configuration"] }
 webpki = { version = "0.21.0", optional = true }
 webpki-roots = { version = "0.20", optional = true }
+tokio-rustls = { version = "0.14", features = ["dangerous_configuration"], optional = true }
 log = "0.4"
 url = "2"
 thiserror = "1"
-
-[dev-dependencies]
+structopt = "0.3"
 pretty_env_logger = "0.4"
 
+[dependencies.tokio]
+version = "0.2.0"
+features = [
+    "macros",
+    "net",
+    "tcp",
+    "io-util",
+    "rt-core",
+    "time",
+    "stream"
+]
+optional = true
+
 [features]
 default = ["client", "server"]
 
 client = ["rustls", "webpki", "webpki-roots"]
-server = ["rustls", "webpki", "webpki-roots"]
+server = ["rustls", "webpki", "webpki-roots", "tokio", "async-trait", "tokio-rustls"]
 
 [workspace]
 members = [

src/bin/majsite.rs

@@ -0,0 +1,78 @@
+use std::fs::File;
+use std::io::{self, BufReader};
+use std::path::{Path, PathBuf};
+use structopt::StructOpt;
+use tokio_rustls::rustls::internal::pemfile::{certs, rsa_private_keys};
+use tokio_rustls::rustls::{Certificate, NoClientAuth, PrivateKey, ServerConfig};
+
+#[derive(StructOpt, Debug)]
+struct Options {
+    /// host to listen on
+    #[structopt(short = "H", long, env = "HOST", default_value = "0.0.0.0")]
+    host: String,
+
+    /// port to listen on
+    #[structopt(short = "p", long, env = "PORT", default_value = "1965")]
+    port: u16,
+
+    /// cert file
+    #[structopt(short = "c", long = "cert", env = "CERT_FILE")]
+    cert: PathBuf,
+
+    /// key file
+    #[structopt(short = "k", long = "key", env = "KEY_FILE")]
+    key: PathBuf,
+}
+
+fn load_certs(path: &Path) -> io::Result<Vec<Certificate>> {
+    certs(&mut BufReader::new(File::open(path)?))
+        .map_err(|_| io::Error::new(io::ErrorKind::InvalidInput, "invalid cert"))
+}
+
+fn load_keys(path: &Path) -> io::Result<Vec<PrivateKey>> {
+    rsa_private_keys(&mut BufReader::new(File::open(path)?))
+        .map_err(|_| io::Error::new(io::ErrorKind::InvalidInput, "invalid key"))
+}
+
+#[tokio::main]
+async fn main() -> Result<(), maj::server::Error> {
+    pretty_env_logger::init();
+    let opts = Options::from_args();
+    let certs = load_certs(&opts.cert)?;
+    let mut keys = load_keys(&opts.key)?;
+
+    let mut config = ServerConfig::new(NoClientAuth::new());
+    config
+        .set_single_cert(certs, keys.remove(0))
+        .map_err(|err| io::Error::new(io::ErrorKind::InvalidInput, err))?;
+
+    maj::server::serve(Handler{}, config, opts.host, opts.port).await?;
+
+    Ok(())
+}
+
+struct Handler {}
+
+fn index() -> Result<maj::Response, maj::server::Error> {
+    let msg = include_bytes!("../../majc/src/help.gmi");
+
+    Ok(maj::Response {
+        status: maj::StatusCode::Success,
+        meta: "text/gemini".to_string(),
+        body: msg.to_vec(),
+    })
+}
+
+#[async_trait::async_trait]
+impl maj::server::Handler for Handler {
+    async fn handle(&self, r: maj::server::Request) -> Result<maj::Response, maj::server::Error> {
+        match r.url.path() {
+            "/" | "" => index(),
+            _ => Ok(maj::Response {
+                status: maj::StatusCode::NotFound,
+                meta: format!("{} not found", r.url),
+                body: vec![],
+            }),
+        }
+    }
+}

src/lib.rs

@@ -12,6 +12,4 @@ mod client;
 pub use client::{get, Error as ClientError};
 
 #[cfg(feature = "server")]
-mod server;
-#[cfg(feature = "server")]
-pub use server::{serve, serve_plain, Error as AnyError, Handler};
+pub mod server;

src/server/mod.rs

@@ -1,10 +1,17 @@
-use crate::Response;
-use std::{error::Error as StdError, io};
+use crate::{Response, StatusCode};
+use async_trait::async_trait;
+use rustls::{Certificate, Session};
+use std::{error::Error as StdError, sync::Arc};
+use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
+use tokio::{net::TcpListener, stream::StreamExt};
+use tokio_rustls::TlsAcceptor;
 use url::Url;
 
 /// A Gemini request and its associated metadata.
+#[allow(dead_code)]
 pub struct Request {
-    url: Url,
+    pub url: Url,
+    pub certs: Option<Vec<Certificate>>,
 }
 
 pub type Error = Box<dyn StdError + Sync + Send>;
@@ -13,14 +20,103 @@ pub type Error = Box<dyn StdError + Sync + Send>;
 mod routes;
 pub use routes::*;
 
+#[async_trait]
 pub trait Handler {
-    fn handle(r: Request) -> Result<Response, Error>;
+    async fn handle(&self, r: Request) -> Result<Response, Error>;
+}
+
+pub async fn serve<T>(h: T, cfg: rustls::ServerConfig, host: String, port: u16) -> Result<(), Error>
+where
+    T: Handler,
+{
+    let cfg = Arc::new(cfg);
+    let mut listener = TcpListener::bind(&format!("{}:{}", host, port)).await?;
+    let mut incoming = listener.incoming();
+    let acceptor = TlsAcceptor::from(cfg.clone());
+
+    while let Some(stream) = incoming.next().await {
+        let stream = stream?;
+        let addr = stream.peer_addr().unwrap();
+        let acceptor = acceptor.clone();
+        let mut stream = acceptor.accept(stream).await?;
+        let mut rd = BufReader::new(&mut stream);
+        let mut u = String::new();
+        rd.read_line(&mut u).await?;
+        if u.len() > 1025 {
+            stream
+                .write(format!("{} URL too long", StatusCode::BadRequest as u8).as_bytes())
+                .await?;
+            continue;
+        }
+
+        let u = Url::parse(&u)?;
+        match h
+            .handle(Request {
+                url: u.clone(),
+                certs: stream.get_ref().1.get_peer_certificates(),
+            })
+            .await
+        {
+            Ok(resp) => {
+                stream
+                    .write(format!("{} {}\r\n", resp.status as u8, resp.meta).as_bytes())
+                    .await?;
+                stream.write(&resp.body).await?;
+                log::info!("{}: {} {:?}", addr, u, resp.status);
+            }
+            Err(why) => {
+                stream
+                    .write(format!("{} {:?}\r\n", StatusCode::PermanentFailure as u8, why).as_bytes())
+                    .await?;
+                log::error!("{}: {}: {:?}", addr, u, why);
+            }
+        };
     }
 
-pub fn serve(_h: impl Handler, _port: u16) -> io::Result<()> {
     Ok(())
 }
 
-pub fn serve_plain(_h: impl Handler, _port: u16) -> io::Result<()> {
+pub async fn serve_plain<T>(h: T, host: String, port: u16) -> Result<(), Error>
+where
+    T: Handler,
+{
+    let mut listener = TcpListener::bind(&format!("{}:{}", host, port)).await?;
+    let mut incoming = listener.incoming();
+    while let Some(stream) = incoming.next().await {
+        let mut stream = stream?;
+        let mut rd = BufReader::new(&mut stream);
+        let mut u = String::new();
+        rd.read_line(&mut u).await?;
+        if u.len() > 1025 {
+            stream
+                .write(format!("{} URL too long", StatusCode::BadRequest as u8).as_bytes())
+                .await?;
+            continue;
+        }
+
+        let u = Url::parse(&u)?;
+        match h
+            .handle(Request {
+                url: u.clone(),
+                certs: None,
+            })
+            .await
+        {
+            Ok(resp) => {
+                stream
+                    .write(format!("{} {}", resp.status as u8, resp.meta).as_bytes())
+                    .await?;
+                stream.write(&resp.body).await?;
+                log::info!("{}: {} {:?}", stream.peer_addr().unwrap(), u, resp.status);
+            }
+            Err(why) => {
+                stream
+                    .write(format!("{} {:?}", StatusCode::PermanentFailure as u8, why).as_bytes())
+                    .await?;
+                log::error!("{}: {}: {:?}", stream.peer_addr().unwrap(), u, why);
+            }
+        };
+    }
+
     Ok(())
 }