Display user badges

ts/badges/isBadgeImageFileUrlValid.ts

@@ -0,0 +1,12 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { maybeParseUrl } from '../util/url';
+
+export function isBadgeImageFileUrlValid(
+  url: string,
+  updatesUrl: string
+): boolean {
+  const expectedPrefix = new URL('/static/badges', updatesUrl).href;
+  return url.startsWith(expectedPrefix) && Boolean(maybeParseUrl(url));
+}