update restful api

api/spa_handler.go

@@ -0,0 +1,34 @@
+package api
+
+import (
+	"net/http"
+	"os"
+	"path/filepath"
+)
+
+type SPAHandler struct {
+	StaticPath string
+	IndexPath  string
+}
+
+func (h SPAHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	path, err := filepath.Abs(r.URL.Path)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	path = filepath.Join(h.StaticPath, path)
+
+	_, err = os.Stat(path)
+	if os.IsNotExist(err) {
+		// file does not exist, serve index.html
+		http.ServeFile(w, r, filepath.Join(h.StaticPath, h.IndexPath))
+		return
+	} else if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	http.FileServer(http.Dir(h.StaticPath)).ServeHTTP(w, r)
+}