1 files changed, 31 insertions, 0 deletions
diff --git a/webui/handler.go b/webui/handler.go
new file mode 100644
index 00000000..476a46cf
--- /dev/null
+++ b/webui/handler.go
@@ -0,0 +1,31 @@
+package webui
+
+import (
+	"net/http"
+	"os"
+)
+
+// implement a http.FileSystem that will serve a default file when the looked up
+// file doesn't exist. Useful for Single-Page App that implement routing client
+// side, where the server has to return the root index.html file for every route.
+type fileSystemWithDefault struct {
+	http.FileSystem
+	defaultFile string
+}
+
+func (fswd *fileSystemWithDefault) Open(name string) (http.File, error) {
+	f, err := fswd.FileSystem.Open(name)
+	if os.IsNotExist(err) {
+		return fswd.FileSystem.Open(fswd.defaultFile)
+	}
+	return f, err
+}
+
+func NewHandler() http.Handler {
+	assetsHandler := &fileSystemWithDefault{
+		FileSystem:  WebUIAssets,
+		defaultFile: "index.html",
+	}
+
+	return http.FileServer(assetsHandler)
+}