feat: allow unauthenticated uploads

frontend/src/components/upload/ExpirationPreview.tsx

@@ -0,0 +1,19 @@
+import moment from "moment";
+
+const ExpirationPreview = ({ form }: { form: any }) => {
+  const value = form.values.never_expires
+    ? "never"
+    : form.values.expiration_num + form.values.expiration_unit;
+  if (value === "never") return "This share will never expire.";
+
+  const expirationDate = moment()
+    .add(
+      value.split("-")[0],
+      value.split("-")[1] as moment.unitOfTime.DurationConstructor
+    )
+    .toDate();
+
+  return `This share will expire on ${moment(expirationDate).format("LLL")}`;
+};
+
+export default ExpirationPreview;