Misc fixes

front/src/utils/is-domain.ts

@@ -0,0 +1,10 @@
+import { isDefined } from './isDefined';
+
+export function isDomain(url: string | undefined | null) {
+  return (
+    isDefined(url) &&
+    /^((?!-))(xn--)?[a-z0-9][a-z0-9-_]{0,61}[a-z0-9]{0,1}\.(xn--)?([a-z0-9-]{1,61}|[a-z0-9-]{1,30}\.[a-z]{2,})$/.test(
+      url,
+    )
+  );
+}