httpd: Add /raw route to get file at canonical head

Instead of requiring to specify a commit to obtain a file through the
/raw route, this commit allows to prefix `/head` to get the file at the
current canonical head commit.

radicle-httpd/src/raw.rs

@@ -7,6 +7,7 @@ use axum::response::IntoResponse;
 use axum::routing::get;
 use axum::Router;
 use hyper::HeaderMap;
+use radicle_surf::blob::{Blob, BlobRef};
 use tower_http::cors;
 
 use radicle::prelude::RepoId;
@@ -94,8 +95,9 @@ static MIMES: &[(&str, &str)] = &[
 
 pub fn router(profile: Arc<Profile>) -> Router {
     Router::new()
-        .route("/:project/:sha/*path", get(file_by_path_handler))
-        .route("/:project/blobs/:oid", get(file_by_oid_handler))
+        .route("/:rid/:sha/*path", get(file_by_commit_handler))
+        .route("/:rid/head/*path", get(file_by_canonical_head_handler))
+        .route("/:rid/blobs/:oid", get(file_by_oid_handler))
         .with_state(profile)
         .layer(
             cors::CorsLayer::new()
@@ -106,7 +108,7 @@ pub fn router(profile: Arc<Profile>) -> Router {
         )
 }
 
-async fn file_by_path_handler(
+async fn file_by_commit_handler(
     Path((rid, sha, path)): Path<(RepoId, Oid, String)>,
     State(profile): State<Arc<Profile>>,
 ) -> impl IntoResponse {
@@ -118,10 +120,36 @@ async fn file_by_path_handler(
         return Err(Error::NotFound);
     }
 
-    let mut response_headers = HeaderMap::new();
     let repo: Repository = repo.backend.into();
     let blob = repo.blob(sha, &path)?;
 
+    blob_response(blob, path)
+}
+
+async fn file_by_canonical_head_handler(
+    Path((rid, path)): Path<(RepoId, String)>,
+    State(profile): State<Arc<Profile>>,
+) -> impl IntoResponse {
+    let storage = &profile.storage;
+    let repo = storage.repository(rid)?;
+
+    // Don't allow downloading raw files for private repos.
+    if repo.identity_doc()?.visibility.is_private() {
+        return Err(Error::NotFound);
+    }
+
+    let (_, sha) = repo.head()?;
+    let repo: Repository = repo.backend.into();
+    let blob = repo.blob(sha, &path)?;
+
+    blob_response(blob, path)
+}
+
+fn blob_response(
+    blob: Blob<BlobRef>,
+    path: String,
+) -> Result<(StatusCode, HeaderMap, Vec<u8>), Error> {
+    let mut response_headers = HeaderMap::new();
     if blob.size() > MAX_BLOB_SIZE {
         return Ok::<_, Error>((StatusCode::PAYLOAD_TOO_LARGE, response_headers, vec![]));
     }
@@ -171,8 +199,8 @@ async fn file_by_oid_handler(
 mod routes {
     use axum::http::StatusCode;
 
-    use crate::test::{self, get, HEAD, RID, RID_PRIVATE};
-    use radicle::storage::{ReadRepository, ReadStorage};
+    use crate::test::{self, get, RID, RID_PRIVATE};
+    use radicle::storage::ReadStorage;
 
     #[tokio::test]
     async fn test_file_handler() {
@@ -180,20 +208,18 @@ mod routes {
         let ctx = test::seed(tmp.path());
         let app = super::router(ctx.profile().to_owned());
 
-        let response = get(&app, format!("/{RID}/{HEAD}/dir1/README")).await;
+        let response = get(&app, format!("/{RID}/head/dir1/README")).await;
 
         assert_eq!(response.status(), StatusCode::OK);
         assert_eq!(response.body().await, "Hello World from dir1!\n");
 
         // Make sure the repo exists in storage.
-        let repo = ctx
-            .profile()
+        ctx.profile()
             .storage
             .repository(RID_PRIVATE.parse().unwrap())
             .unwrap();
-        let (_, head) = repo.head().unwrap();
 
-        let response = get(&app, format!("/{RID_PRIVATE}/{head}/README")).await;
+        let response = get(&app, format!("/{RID_PRIVATE}/head/README")).await;
         assert_eq!(response.status(), StatusCode::NOT_FOUND);
     }
 }