first commit

common/resources/client/custom-domains/use-default-custom-domain-host.ts

@@ -0,0 +1,17 @@
+import {useMemo} from 'react';
+import {useSettings} from '@common/core/settings/use-settings';
+import {CustomDomain} from '@common/custom-domains/custom-domain';
+
+export function useDefaultCustomDomainHost(
+  allDomains?: CustomDomain[]
+): string {
+  const {custom_domains, base_url} = useSettings();
+  return useMemo(() => {
+    const selectedHost = custom_domains?.default_host;
+    if (selectedHost) {
+      const host = allDomains?.find(d => d.host === selectedHost)?.host;
+      if (host) return host;
+    }
+    return base_url.replace(/\/$/, '').replace(/(^\w+:|^)\/\//, '');
+  }, [custom_domains, base_url, allDomains]);
+}