First commit in rust

backchannel-server/src/http/server.rs

@@ -0,0 +1,65 @@
+use anyhow::{Context, Result};
+use axum::body::Body;
+use axum::extract::Path;
+use axum::http::{header, HeaderValue, StatusCode};
+use axum::response::{IntoResponse, Response};
+use axum::routing::get;
+use axum::Router;
+use mime_guess::from_path;
+use rust_embed::RustEmbed;
+
+#[derive(RustEmbed)]
+#[folder = "../backchannel-web/dist"]
+struct WebAssets;
+
+pub async fn serve(bind_addr: &str) -> Result<()> {
+    let app = Router::new()
+        .route("/", get(index))
+        .route("/*path", get(asset_or_index));
+
+    let listener = tokio::net::TcpListener::bind(bind_addr)
+        .await
+        .with_context(|| format!("Failed to bind HTTP server to {bind_addr}"))?;
+
+    tracing::info!("BackChannel web UI listening on http://{bind_addr}");
+    axum::serve(listener, app).await.context("HTTP server failed")
+}
+
+async fn index() -> Response {
+    render_asset("index.html")
+}
+
+async fn asset_or_index(Path(path): Path<String>) -> Response {
+    if path.is_empty() {
+        return render_asset("index.html");
+    }
+
+    render_asset(&path)
+}
+
+fn render_asset(path: &str) -> Response {
+    let canonical = path.trim_start_matches('/');
+
+    if let Some(content) = WebAssets::get(canonical) {
+        return build_response(canonical, content.data.as_ref(), StatusCode::OK);
+    }
+
+    if let Some(index) = WebAssets::get("index.html") {
+        return build_response("index.html", index.data.as_ref(), StatusCode::OK);
+    }
+
+    (StatusCode::NOT_FOUND, "Web UI asset not found").into_response()
+}
+
+fn build_response(path: &str, body: &[u8], status: StatusCode) -> Response {
+    let mime = from_path(path).first_or_octet_stream();
+
+    let mut response = Response::new(Body::from(body.to_vec()));
+    *response.status_mut() = status;
+    response.headers_mut().insert(
+        header::CONTENT_TYPE,
+        HeaderValue::from_str(mime.as_ref()).unwrap_or(HeaderValue::from_static("application/octet-stream")),
+    );
+
+    response
+}