Bump axum, fix trailing slash middleware issue

Cargo.toml

@@ -3,7 +3,7 @@ name = "s3-active-storage"
 version = "0.1.0"
 edition = "2021"
 # Due to AWS SDK.
-rust-version = "1.62.1"
+rust-version = "1.66.1"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -14,8 +14,7 @@ aws-sdk-s3 = "0.27"
 aws-smithy-http = "0.55"
 aws-smithy-types = "0.55"
 aws-types = "0.55"
-# Axum 0.6.13 introduced a change in behaviour around trimming trailing paths.
-axum = { version = "=0.6.12", features = ["headers"] }
+axum = { version = "0.6", features = ["headers"] }
 axum-server = { version = "0.4.7", features = ["tls-rustls"] }
 clap = { version = "4.2", features = ["derive", "env"] }
 expanduser = "1.2.2"
@@ -33,6 +32,7 @@ thiserror = "1.0"
 tokio = { version = "1.28", features = ["full"] }
 tower = "0.4"
 tower-http = { version = "0.4", features = ["normalize-path", "trace", "validate-request"] }
+tower-service = "0.3"
 tokio-stream = "0.1"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }

src/app.rs

@@ -19,6 +19,7 @@ use axum::{
     Router, TypedHeader,
 };
 
+use tower::Layer;
 use tower::ServiceBuilder;
 use tower_http::normalize_path::NormalizePathLayer;
 use tower_http::trace::TraceLayer;
@@ -54,9 +55,7 @@ impl IntoResponse for models::Response {
 /// * a [tower_http::trace::TraceLayer] for tracing requests and responses
 /// * a [tower_http::validate_request::ValidateRequestHeaderLayer] for validating authorisation
 ///   headers
-/// * a [tower_http::normalize_path::NormalizePathLayer] for trimming trailing slashes from
-///   requests
-pub fn router() -> Router {
+fn router() -> Router {
     fn v1() -> Router {
         Router::new()
             .route("/count", post(operation_handler::<operations::Count>))
@@ -85,7 +84,25 @@ pub fn router() -> Router {
     Router::new()
         .route("/.well-known/s3-active-storage-schema", get(schema))
         .nest("/v1", v1())
-        .layer(NormalizePathLayer::trim_trailing_slash())
+}
+
+/// Returns a [tower_service::Service] for the Active Storage server API
+///
+/// The service is populated with all routes as well as the following middleware:
+///
+/// * a [tower_http::trace::TraceLayer] for tracing requests and responses
+/// * a [tower_http::validate_request::ValidateRequestHeaderLayer] for validating authorisation
+///   headers
+/// * a [tower_http::normalize_path::NormalizePathLayer] for trimming trailing slashes from
+///   requests
+pub fn service() -> tower_http::normalize_path::NormalizePath<Router> {
+    // FIXME: The return type should be some form of tower_service::Service, but couldn't find the
+    // necessary trait bounds.
+
+    // Note that any middleware that should affect routing must wrap the router.
+    // See
+    // https://docs.rs/axum/0.6.18/axum/middleware/index.html#rewriting-request-uri-in-middleware.
+    NormalizePathLayer::trim_trailing_slash().layer(router())
 }
 
 /// TODO: Return an OpenAPI schema

src/main.rs

@@ -24,6 +24,7 @@
 
 use std::{net::SocketAddr, process::exit, str::FromStr, time::Duration};
 
+use axum::ServiceExt;
 use axum_server::{tls_rustls::RustlsConfig, Handle};
 use clap::Parser;
 use expanduser::expanduser;
@@ -77,7 +78,7 @@ async fn main() {
 
     init_tracing();
 
-    let router = app::router();
+    let service = app::service();
     let addr = SocketAddr::from_str(&format!("{}:{}", args.host, args.port))
         .expect("invalid host name, IP address or port number");
 
@@ -120,14 +121,14 @@ async fn main() {
         // run HTTPS server with hyper
         axum_server::bind_rustls(addr, tls_config)
             .handle(handle)
-            .serve(router.into_make_service())
+            .serve(service.into_make_service())
             .await
             .unwrap();
     } else {
         // run HTTP server with hyper
         axum_server::bind(addr)
             .handle(handle)
-            .serve(router.into_make_service())
+            .serve(service.into_make_service())
             .await
             .unwrap();
     }