add a http -> https redirect and better port constants

Cargo.toml

@@ -4,10 +4,11 @@ version = "0.1.0"
 edition = "2024"
 
 [features]
-https = ["dep:rustls"]
+https = ["dep:rustls", "dep:axum-extra"]
 
 [dependencies]
 axum = "0.8.4"
+axum-extra = { version = "0.10.1", optional = true }
 axum-server = { version = "0.7.2", features = ["tls-rustls"] }
 dotenvy = "0.15.7"
 rustls = { version = "0.23.31", optional = true }

src/main.rs

@@ -1,4 +1,4 @@
-use std::net::{Ipv4Addr, SocketAddrV4};
+use std::net::{Ipv4Addr, SocketAddr, SocketAddrV4};
 
 use crate::app::new_app;
 
@@ -8,15 +8,27 @@ compile_error!("Feature `https` must be enabled on release.");
 
 mod app;
 
+#[allow(dead_code)]
+struct Ports {
+    http: u16,
+    https: u16,
+}
+
 #[cfg(not(debug_assertions))]
-const PORT: u16 = 443;
+const PORTS: Ports = Ports {
+    http: 80,
+    https: 443,
+};
 #[cfg(debug_assertions)]
-const PORT: u16 = 8080;
+const PORTS: Ports = Ports {
+    http: 8080,
+    https: 4430,
+};
 
 #[cfg(debug_assertions)]
-const ADDR: SocketAddrV4 = SocketAddrV4::new(Ipv4Addr::LOCALHOST, PORT);
+const ADDR: Ipv4Addr = Ipv4Addr::LOCALHOST;
 #[cfg(not(debug_assertions))]
-const ADDR: SocketAddrV4 = SocketAddrV4::new(Ipv4Addr::UNSPECIFIED, PORT);
+const ADDR: Ipv4Addr = Ipv4Addr::UNSPECIFIED;
 
 #[tokio::main]
 async fn main() {
@@ -31,7 +43,7 @@ async fn main() {
 async fn http_main() {
     let app = new_app();
 
-    axum_server::bind(std::net::SocketAddr::V4(ADDR))
+    axum_server::bind(SocketAddr::V4(SocketAddrV4::new(ADDR, PORTS.http)))
         .serve(app.into_make_service())
         .await
         .unwrap();
@@ -49,11 +61,67 @@ async fn https_main() {
     .await
     .unwrap();
 
+    tokio::spawn(redirect_http_to_https(PORTS));
+
     let app = new_app();
 
     // run https server
-    axum_server::bind_rustls(std::net::SocketAddr::V4(ADDR), config)
+    axum_server::bind_rustls(SocketAddr::V4(SocketAddrV4::new(ADDR, PORTS.https)), config)
         .serve(app.into_make_service())
         .await
         .unwrap();
 }
+
+#[cfg(feature = "https")]
+async fn redirect_http_to_https(ports: Ports) {
+    use axum::{
+        BoxError,
+        handler::HandlerWithoutStateExt,
+        http::{Uri, uri::Authority},
+    };
+    use axum_extra::extract::Host;
+
+    fn make_https(host: &str, uri: Uri, https_port: u16) -> Result<Uri, BoxError> {
+        let mut parts = uri.into_parts();
+
+        parts.scheme = Some(axum::http::uri::Scheme::HTTPS);
+
+        if parts.path_and_query.is_none() {
+            parts.path_and_query = Some("/".parse().unwrap());
+        }
+
+        let authority: Authority = host.parse()?;
+        let bare_host = match authority.port() {
+            Some(port_struct) => authority
+                .as_str()
+                .strip_suffix(port_struct.as_str())
+                .unwrap()
+                .strip_suffix(':')
+                .unwrap(), // if authority.port() is Some(port) then we can be sure authority ends with :{port}
+            None => authority.as_str(),
+        };
+
+        parts.authority = Some(format!("{bare_host}:{https_port}").parse()?);
+
+        Ok(Uri::from_parts(parts)?)
+    }
+
+    let redirect = move |Host(host): Host, uri: Uri| async move {
+        use axum::response::Redirect;
+
+        match make_https(&host, uri, ports.https) {
+            Ok(uri) => Ok(Redirect::permanent(&uri.to_string())),
+            Err(_) => {
+                use axum::http::StatusCode;
+
+                Err(StatusCode::BAD_REQUEST)
+            }
+        }
+    };
+
+    let addr = SocketAddr::V4(SocketAddrV4::new(ADDR, ports.http));
+    let listener = tokio::net::TcpListener::bind(addr).await.unwrap();
+    axum::serve(listener, redirect.into_make_service())
+        .await
+        .unwrap();
+}