💩(frontend) mute remote participants

Messy code file organization, but functions are okay. Functional, but not
well-designed and likely hard to maintain. Shipping it, creating technical
debt here. Will be reused for interactions with LiveKit server API.

src/frontend/src/features/rooms/livekit/api/buildServerApiUrl.ts

@@ -0,0 +1,5 @@
+export const buildServerApiUrl = (origin: string, path: string) => {
+  const sanitizedOrigin = origin.replace(/\/$/, '')
+  const sanitizedPath = path.replace(/^\//, '')
+  return `${sanitizedOrigin}/${sanitizedPath}`
+}

src/frontend/src/features/rooms/livekit/api/fetchServerApi.ts

@@ -0,0 +1,21 @@
+import { ApiError } from '@/api/ApiError'
+
+export const fetchServerApi = async <T = Record<string, unknown>>(
+  url: string,
+  token: string,
+  options?: RequestInit
+): Promise<T> => {
+  const response = await fetch(url, {
+    ...options,
+    headers: {
+      'Content-Type': 'application/json',
+      Authorization: `Bearer ${token}`,
+      ...options?.headers,
+    },
+  })
+  const result = await response.json()
+  if (!response.ok) {
+    throw new ApiError(response.status, result)
+  }
+  return result
+}

src/frontend/src/features/rooms/livekit/api/muteParticipant.ts

@@ -0,0 +1,39 @@
+import { Participant, Track } from 'livekit-client'
+import Source = Track.Source
+import { fetchServerApi } from './fetchServerApi'
+import { buildServerApiUrl } from './buildServerApiUrl'
+import { useRoomData } from '../hooks/useRoomData'
+
+export const useMuteParticipant = () => {
+  const data = useRoomData()
+
+  const muteParticipant = (participant: Participant) => {
+    if (!data || !data?.livekit) {
+      throw new Error('Room data is not available')
+    }
+    const trackSid = participant.getTrackPublication(
+      Source.Microphone
+    )?.trackSid
+
+    if (!trackSid) {
+      throw new Error('Missing audio track')
+    }
+    return fetchServerApi(
+      buildServerApiUrl(
+        data.livekit.url,
+        'twirp/livekit.RoomService/MutePublishedTrack'
+      ),
+      data.livekit.token,
+      {
+        method: 'POST',
+        body: JSON.stringify({
+          room: data.livekit.room,
+          identity: participant.identity,
+          muted: true,
+          track_sid: trackSid,
+        }),
+      }
+    )
+  }
+  return { muteParticipant }
+}

src/frontend/src/features/rooms/livekit/components/controls/Participants/ParticipantListItem.tsx

@@ -18,6 +18,7 @@ import { RiMicOffLine } from '@remixicon/react'
 import { TooltipWrapper } from '@/primitives/TooltipWrapper.tsx'
 import { Button, Dialog, P } from '@/primitives'
 import { useState } from 'react'
+import { useMuteParticipant } from '@/features/rooms/livekit/api/muteParticipant'
 
 const MuteAlertDialog = ({
   isOpen,
@@ -52,6 +53,7 @@ type MicIndicatorProps = {
 
 const MicIndicator = ({ participant }: MicIndicatorProps) => {
   const { t } = useTranslation('rooms')
+  const { muteParticipant } = useMuteParticipant()
   const { isMuted } = useTrackMutedIndicator({
     participant: participant,
     source: Source.Microphone,
@@ -98,7 +100,9 @@ const MicIndicator = ({ participant }: MicIndicatorProps) => {
       </TooltipWrapper>
       <MuteAlertDialog
         isOpen={isAlertOpen}
-        onSubmit={() => setIsAlertOpen(false)}
+        onSubmit={() =>
+          muteParticipant(participant).then(() => setIsAlertOpen(false))
+        }
         onClose={() => setIsAlertOpen(false)}
         name={name}
       />

src/frontend/src/features/rooms/livekit/hooks/useRoomData.ts

@@ -0,0 +1,12 @@
+import { ApiRoom } from '@/features/rooms/api/ApiRoom'
+import { useRoomContext } from '@livekit/components-react'
+import { useParams } from 'wouter'
+import { keys } from '@/api/queryKeys'
+import { queryClient } from '@/api/queryClient'
+
+export const useRoomData = (): ApiRoom | undefined => {
+  const room = useRoomContext()
+  const { roomId } = useParams()
+  const queryKey = [keys.room, roomId, room.localParticipant.name]
+  return queryClient.getQueryData<ApiRoom>(queryKey)
+}