Show call support error and disable join button (#2748)

* allow user to end call if error when loading

* show call support missing error if livekit server is not provided

* prevent joining from nav item double click if no livekit support

src/app/hooks/useLivekitSupport.ts

@@ -0,0 +1,16 @@
+import { AutoDiscoveryInfo } from '../cs-api';
+import { useAutoDiscoveryInfo } from './useAutoDiscoveryInfo';
+
+export const livekitSupport = (autoDiscoveryInfo: AutoDiscoveryInfo): boolean => {
+  const rtcFoci = autoDiscoveryInfo['org.matrix.msc4143.rtc_foci'];
+
+  return (
+    Array.isArray(rtcFoci) && rtcFoci.some((info) => typeof info.livekit_service_url === 'string')
+  );
+};
+
+export const useLivekitSupport = (): boolean => {
+  const autoDiscoveryInfo = useAutoDiscoveryInfo();
+
+  return livekitSupport(autoDiscoveryInfo);
+};