feat: initialize NORA artifact registry

Cloud-native multi-protocol artifact registry in Rust.

- Docker Registry v2
- Maven (+ proxy)
- npm (+ proxy)
- Cargo, PyPI
- Web UI, Swagger, Prometheus
- Local & S3 storage
- 32MB Docker image

Created by DevITWay
https://getnora.io

nora-registry/src/registry/cargo_registry.rs

@@ -0,0 +1,43 @@
+use crate::AppState;
+use axum::{
+    extract::{Path, State},
+    http::StatusCode,
+    response::{IntoResponse, Response},
+    routing::get,
+    Router,
+};
+use std::sync::Arc;
+
+pub fn routes() -> Router<Arc<AppState>> {
+    Router::new()
+        .route("/cargo/api/v1/crates/{crate_name}", get(get_metadata))
+        .route(
+            "/cargo/api/v1/crates/{crate_name}/{version}/download",
+            get(download),
+        )
+}
+
+async fn get_metadata(
+    State(state): State<Arc<AppState>>,
+    Path(crate_name): Path<String>,
+) -> Response {
+    let key = format!("cargo/{}/metadata.json", crate_name);
+    match state.storage.get(&key).await {
+        Ok(data) => (StatusCode::OK, data).into_response(),
+        Err(_) => StatusCode::NOT_FOUND.into_response(),
+    }
+}
+
+async fn download(
+    State(state): State<Arc<AppState>>,
+    Path((crate_name, version)): Path<(String, String)>,
+) -> Response {
+    let key = format!(
+        "cargo/{}/{}/{}-{}.crate",
+        crate_name, version, crate_name, version
+    );
+    match state.storage.get(&key).await {
+        Ok(data) => (StatusCode::OK, data).into_response(),
+        Err(_) => StatusCode::NOT_FOUND.into_response(),
+    }
+}