src/app/components/RoomForm.svelte

@@ -1,7 +1,9 @@
 <script lang="ts">
+  import {get} from "svelte/store"
   import type {Snippet} from "svelte"
+  import {assoc, append, nth, type Maybe, uniqBy} from "@welshman/lib"
   import type {RoomMeta} from "@welshman/util"
-  import {makeRoomMeta} from "@welshman/util"
+  import {getTag, makeRoomMeta} from "@welshman/util"
   import {waitForThunkError, createRoom, editRoom, joinRoom} from "@welshman/app"
   import StickerSmileSquare from "@assets/icons/sticker-smile-square.svg?dataurl"
   import Hashtag from "@assets/icons/hashtag.svg?dataurl"
@@ -15,14 +17,14 @@
   import ModalBody from "@lib/components/ModalBody.svelte"
   import {pushToast} from "@app/util/toast"
   import {uploadFile} from "@app/core/commands"
-  import {checkRelayHasLivekit} from "@app/voice"
+  import {deriveHasLivekit} from "@app/core/state"
 
   type RoomMode = "text" | "voice" | "both"
 
-  const getRoomModeFromEvent = (event?: {tags?: string[][]}): RoomMode => {
+  const getRoomModeFromEvent = (event: Maybe<{tags: Maybe<string[][]>}>): RoomMode => {
     const tags = event?.tags ?? []
-    const hasLivekit = tags.some(t => t[0] === "livekit")
-    const hasNoText = tags.some(t => t[0] === "no-text")
+    const hasLivekit = !!getTag("livekit", tags)
+    const hasNoText = !!getTag("no-text", tags)
     if (hasLivekit && hasNoText) return "voice"
     if (hasLivekit) return "both"
     return "text"
@@ -30,8 +32,9 @@
 
   const buildTagsWithRoomMode = (existingTags: string[][], roomMode: RoomMode): string[][] => {
     const filtered = existingTags.filter(t => t[0] !== "livekit" && t[0] !== "no-text")
-    if (roomMode === "both") return [...filtered, ["livekit"]]
-    if (roomMode === "voice") return [...filtered, ["livekit"], ["no-text"]]
+    if (roomMode === "both") return uniqBy(nth(0), append(["livekit"], filtered))
+    if (roomMode === "voice")
+      return uniqBy(nth(0), append(["no-text"], append(["livekit"], filtered)))
     return filtered
   }
 
@@ -47,23 +50,12 @@
 
   const values = $state(initialValues)
   let roomMode = $state<RoomMode>(getRoomModeFromEvent(initialValues.event))
-  let relayHasLivekit = $state<boolean | undefined>(undefined)
-
-  $effect(() => {
-    const u = url
-    let cancelled = false
-    checkRelayHasLivekit(u).then(has => {
-      if (!cancelled) relayHasLivekit = has
-    })
-    return () => {
-      cancelled = true
-    }
-  })
+  const relayHasLivekit = deriveHasLivekit(url)
 
   const submit = async () => {
     const room = $state.snapshot(values)
 
-    if ((roomMode === "voice" || roomMode === "both") && !relayHasLivekit) {
+    if ((roomMode === "voice" || roomMode === "both") && !get(relayHasLivekit)) {
       return pushToast({
         theme: "error",
         message: "This relay does not support voice rooms.",
@@ -84,16 +76,17 @@
       room.pictureMeta = result.tags
     }
 
-    const existingTags = room.event?.tags ?? []
-    const tags = buildTagsWithRoomMode(existingTags, roomMode)
-    room.event = room.event ? {...room.event, tags} : ({tags} as RoomMeta["event"])
-
     const createMessage = await waitForThunkError(createRoom(url, room))
 
     if (createMessage && !createMessage.includes("already")) {
       return pushToast({theme: "error", message: createMessage})
     }
 
+    if (room.event && get(relayHasLivekit)) {
+      const existingTags = room.event.tags ?? []
+      const tags = buildTagsWithRoomMode(existingTags, roomMode)
+      room.event = assoc("tags", tags)(room.event) as RoomMeta["event"]
+    }
     const editMessage = await waitForThunkError(editRoom(url, room))
 
     if (editMessage) {
@@ -207,22 +200,23 @@
         </label>
       {/snippet}
     </FieldInline>
-    <FieldInline>
-      {#snippet label()}
-        <p>Room type</p>
-      {/snippet}
-      {#snippet input()}
-        <select class="select select-bordered w-full" bind:value={roomMode} aria-label="Room type">
-          <option value="text">Text only</option>
-          <option value="both" disabled={relayHasLivekit === false}>
-            Text and voice{relayHasLivekit === false ? " (not setup)" : ""}
-          </option>
-          <option value="voice" disabled={relayHasLivekit === false}>
-            Voice only{relayHasLivekit === false ? " (not setup)" : ""}
-          </option>
-        </select>
-      {/snippet}
-    </FieldInline>
+    {#if $relayHasLivekit}
+      <FieldInline>
+        {#snippet label()}
+          <p>Room type</p>
+        {/snippet}
+        {#snippet input()}
+          <select
+            class="select select-bordered w-full"
+            bind:value={roomMode}
+            aria-label="Room type">
+            <option value="text">Text only</option>
+            <option value="both">Text and voice</option>
+            <option value="voice">Voice only</option>
+          </select>
+        {/snippet}
+      </FieldInline>
+    {/if}
     <strong class="md:hidden">Permissions</strong>
     <div class="flex items-center gap-2">
       <input type="checkbox" class="checkbox" bind:checked={values.isRestricted} />

src/app/core/state.ts

@@ -146,6 +146,7 @@ import {
   displayProfileByPubkey,
   getProfile,
 } from "@welshman/app"
+import {checkRelayHasLivekit} from "$lib/livekit"
 import {readFeed} from "@lib/feeds"
 
 export const fromCsv = (s: string) => (s || "").split(",").filter(identity)
@@ -1197,6 +1198,12 @@ export const deriveSupportedMethods = simpleCache(([url]: [string]) => {
   })
 })
 
+export const deriveHasLivekit = simpleCache(([url]: [string]) =>
+  readable<boolean | undefined>(undefined, set => {
+    checkRelayHasLivekit(url).then(has => set(has))
+  }),
+)
+
 export const deriveTimeout = (timeout: number) => {
   const store = writable<boolean>(false)
 

src/app/voice.ts

@@ -8,31 +8,13 @@ import {derived, get, writable} from "svelte/store"
 import {now} from "@welshman/lib"
 import {makeEvent, getTagValue} from "@welshman/util"
 import {signer, publishThunk} from "@welshman/app"
+import {getLivekitEndpoint} from "$lib/livekit"
 import {deriveEventsForUrl} from "@app/core/state"
 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/${groupId}`
-}
-
-export const checkRelayHasLivekit = async (url: string): Promise<boolean> => {
-  const endpoint = livekitEndpoint(url, "nop")
-
-  try {
-    // Currently we are hitting the API with no auth because zooid returns a 401 livekit
-    // is configured and 404 if it is not. But we need a standardized solution in the NIP.
-    const response = await fetch(endpoint)
-    return response.status === 401
-  } catch {
-    return false
-  }
-}
+export {checkRelayHasLivekit} from "$lib/livekit"
 
 const PRESENCE_INTERVAL_MS = 60_000
 const PRESENCE_EXPIRY_S = 300
@@ -53,7 +35,7 @@ const fetchLivekitToken = async (
   groupId: string,
   signal?: AbortSignal,
 ): Promise<{server_url: string; participant_token: string}> => {
-  const endpoint = livekitEndpoint(url, groupId)
+  const endpoint = getLivekitEndpoint(url, groupId)
 
   const $signer = signer.get()
   if (!$signer) throw new Error("No signer available")

src/lib/livekit.ts

@@ -0,0 +1,21 @@
+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 {
+    // Zooid returns 401 when livekit is configured and 404 if it is not.
+    const response = await fetch(endpoint)
+    return response.status === 401
+  } catch {
+    return false
+  }
+}
+
+export const getLivekitEndpoint = (url: string, groupId: string) => livekitEndpoint(url, groupId)