Check if livekit is configured on the relay during room creation/edit

src/app/voice.ts

@@ -1,3 +1,7 @@
+/**
+ * Voice rooms via LiveKit. Note: Voice does not work on localhost in Firefox
+ * (ICE candidate gathering fails). Use Chrome or test from deployed HTTPS.
+ */
 import {DisconnectReason, Room, RoomEvent, Track} from "livekit-client"
 import {getToken} from "nostr-tools/nip98"
 import {derived, get, writable} from "svelte/store"
@@ -9,6 +13,27 @@ import {pushToast} from "@app/util/toast"
 
 export const ROOM_PRESENCE = 10312
 
+const livekitEndpoint = (url: string, groupId: string) => {
+  const httpUrl = url
+    .replace(/^wss:\/\//, "https://")
+    .replace(/^ws:\/\//, "http://")
+    .replace(/\/$/, "")
+  return `${httpUrl}/.well-known/nip29/livekit/${groupId}`
+}
+
+export const checkRelayHasLivekit = async (url: string): Promise<boolean> => {
+  const endpoint = livekitEndpoint(url, "nop")
+
+  try {
+    // Currently we are hitting the API with no auth because zooid returns a 401 livekit
+    // is configured and 404 if it is not. But we need a standardized solution in the NIP.
+    const response = await fetch(endpoint)
+    return response.status === 401
+  } catch {
+    return false
+  }
+}
+
 const PRESENCE_INTERVAL_MS = 60_000
 const PRESENCE_EXPIRY_S = 300
 
@@ -26,11 +51,7 @@ const fetchLivekitToken = async (
   groupId: string,
   signal?: AbortSignal,
 ): Promise<{server_url: string; participant_token: string}> => {
-  const httpUrl = url
-    .replace(/^wss:\/\//, "https://")
-    .replace(/^ws:\/\//, "http://")
-    .replace(/\/$/, "")
-  const endpoint = `${httpUrl}/.well-known/nip29/livekit/${groupId}`
+  const endpoint = livekitEndpoint(url, groupId)
 
   const $signer = signer.get()
   if (!$signer) throw new Error("No signer available")