HEAD Object route

api/api.go

@@ -34,6 +34,7 @@ func (h *Handler) setupRoutes() {
 	h.router.Get("/", h.handleWelcome)
 	h.router.Get("/*", h.handleGetObject)
 	h.router.Put("/*", h.handlePutObject)
+	h.router.Head("/*", h.handleHeadObject)
 }
 
 func (h *Handler) handleWelcome(w http.ResponseWriter, r *http.Request) {
@@ -89,6 +90,23 @@ func (h *Handler) handlePutObject(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusOK)
 }
 
+func (h *Handler) handleHeadObject(w http.ResponseWriter, r *http.Request) {
+	urlParams := chi.URLParam(r, "*")
+	bucket := strings.Split(urlParams, "/")[0]
+	key := strings.Join(strings.Split(urlParams, "/")[1:], "/")
+
+	manifest, err := h.svc.HeadObject(bucket, key)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusNotFound)
+		return
+	}
+
+	w.Header().Set("ETag", manifest.ETag)
+	w.Header().Set("Content-Length", "0")
+	w.Header().Set("Last-Modified", time.Unix(manifest.CreatedAt, 0).UTC().Format(time.RFC1123))
+	w.WriteHeader(http.StatusOK)
+}
+
 func (h *Handler) Start(address string) error {
 	fmt.Printf("Starting API server on %s\n", address)
 	h.setupRoutes()

service/service.go

@@ -64,3 +64,11 @@ func (s *ObjectService) GetObject(bucket, key string) (io.ReadCloser, *models.Ob
 	}()
 	return pr, manifest, nil
 }
+
+func (s *ObjectService) HeadObject(bucket, key string) (models.ObjectManifest, error) {
+	manifest, err := s.metadataHandler.GetManifest(bucket, key)
+	if err != nil {
+		return models.ObjectManifest{}, err
+	}
+	return *manifest, nil
+}