feat: rewrite backend to go

backend/ui/ui.go

@@ -0,0 +1,6 @@
+//go:build !prod
+// +build !prod
+
+package ui
+
+func ServeUI() {}

backend/ui/ui_prod.go

@@ -0,0 +1,34 @@
+//go:build prod
+// +build prod
+
+package ui
+
+import (
+	"embed"
+	"io/fs"
+	"net/http"
+	"path"
+)
+
+//go:embed dist
+var embeddedFs embed.FS
+
+func ServeUI() {
+	distFs, _ := fs.Sub(embeddedFs, "dist")
+	fileServer := http.FileServer(http.FS(distFs))
+
+	http.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_path := path.Clean(r.URL.Path)[1:]
+
+		// Rewrite non-existing paths to index.html
+		if _, err := fs.Stat(distFs, _path); err != nil {
+			index, _ := fs.ReadFile(distFs, "index.html")
+			w.Header().Add("Content-Type", "text/html")
+			w.WriteHeader(http.StatusOK)
+			w.Write(index)
+			return
+		}
+
+		fileServer.ServeHTTP(w, r)
+	}))
+}