✨(frontend) initialize application from remote configs

Query API to get the App's configs.
Replacement for env variables, thus with a single image,
we can dynamically update frontend's behavior.

Code inspired by Marsha. Not sure having a single component
returning null is a good idea, to be discussed.

src/frontend/src/App.tsx

@@ -11,23 +11,15 @@ import { Layout } from './layout/Layout'
 import { NotFoundScreen } from './components/NotFoundScreen'
 import { routes } from './routes'
 import './i18n/init'
-import { silenceLiveKitLogs } from '@/utils/livekit.ts'
 import { queryClient } from '@/api/queryClient'
-import { useAnalytics } from '@/features/analytics/hooks/useAnalytics'
-import { useSupport } from '@/features/support/hooks/useSupport'
+import { AppInitialization } from '@/components/AppInitialization'
 
 function App() {
   const { i18n } = useTranslation()
   useLang(i18n.language)
-
-  const isProduction = import.meta.env.PROD
-  silenceLiveKitLogs(isProduction)
-
-  useAnalytics()
-  useSupport()
-
   return (
     <QueryClientProvider client={queryClient}>
+      <AppInitialization />
       <Suspense fallback={null}>
         <I18nProvider locale={i18n.language}>
           <Layout>

src/frontend/src/api/queryKeys.ts

@@ -1,4 +1,5 @@
 export const keys = {
   user: 'user',
   room: 'room',
+  config: 'config',
 }

src/frontend/src/api/useConfig.ts

@@ -0,0 +1,26 @@
+import { fetchApi } from './fetchApi'
+import { keys } from './queryKeys'
+import { useQuery } from '@tanstack/react-query'
+
+export interface ApiConfig {
+  analytics?: {
+    id: string
+    host: string
+  }
+  support?: {
+    id: string
+  }
+  silence_livekit_debug_logs?: boolean
+}
+
+const fetchConfig = (): Promise<ApiConfig> => {
+  return fetchApi<ApiConfig>(`config/`)
+}
+
+export const useConfig = () => {
+  return useQuery({
+    queryKey: [keys.config],
+    queryFn: fetchConfig,
+    staleTime: Infinity,
+  })
+}

src/frontend/src/components/AppInitialization.tsx

@@ -0,0 +1,20 @@
+import { silenceLiveKitLogs } from '@/utils/livekit'
+import { useConfig } from '@/api/useConfig'
+import { useAnalytics } from '@/features/analytics/hooks/useAnalytics'
+import { useSupport } from '@/features/support/hooks/useSupport'
+
+export const AppInitialization = () => {
+  const { data } = useConfig()
+
+  const {
+    analytics = {},
+    support = {},
+    silence_livekit_debug_logs = false,
+  } = data || {}
+
+  useAnalytics(analytics)
+  useSupport(support)
+  silenceLiveKitLogs(silence_livekit_debug_logs)
+
+  return null
+}

src/frontend/src/features/analytics/hooks/useAnalytics.tsx

@@ -3,9 +3,6 @@ import { useLocation } from 'wouter'
 import posthog from 'posthog-js'
 import { ApiUser } from '@/features/auth/api/ApiUser'
 
-const ANALYTICS_ID = 'phc_RPYko028Oqtj0c9exLIWwrlrjLxSdxT0ntW0Lam4iom'
-const ANALYTICS_HOST = 'https://eu.i.posthog.com'
-
 export const startAnalyticsSession = (data: ApiUser) => {
   if (posthog._isIdentified()) return
   const { id, email } = data
@@ -17,21 +14,21 @@ export const terminateAnalyticsSession = () => {
   posthog.reset()
 }
 
-export const useAnalytics = () => {
+export type useAnalyticsProps = {
+  id?: string
+  host?: string
+}
+
+export const useAnalytics = ({ id, host }: useAnalyticsProps) => {
   const [location] = useLocation()
-
-  const isProduction = import.meta.env.PROD
-
   useEffect(() => {
-    // We're on a free tier, so we need to limit the number of events we send to PostHog.
-    // Be frugal with event tracking, even though we could filter them out later if necessary.
-    if (!isProduction) return
+    if (!id || !host) return
     if (posthog.__loaded) return
-    posthog.init(ANALYTICS_ID, {
-      api_host: ANALYTICS_HOST,
+    posthog.init(id, {
+      api_host: host,
       person_profiles: 'always',
     })
-  }, [isProduction])
+  }, [id, host])
 
   // From PostHog tutorial on PageView tracking in a Single Page Application (SPA) context.
   useEffect(() => {

src/frontend/src/features/support/hooks/useSupport.tsx

@@ -2,8 +2,6 @@ import { useEffect } from 'react'
 import { Crisp } from 'crisp-sdk-web'
 import { ApiUser } from '@/features/auth/api/ApiUser'
 
-const SUPPORT_ID = '58ea6697-8eba-4492-bc59-ad6562585041'
-
 export const initializeSupportSession = (user: ApiUser) => {
   if (!Crisp.isCrispInjected()) return
   const { id, email } = user
@@ -17,17 +15,17 @@ export const terminateSupportSession = () => {
   Crisp.session.reset()
 }
 
+export type useSupportProps = {
+  id?: string
+}
+
 // Configure Crisp chat for real-time support across all pages.
-export const useSupport = () => {
+export const useSupport = ({ id }: useSupportProps) => {
   useEffect(() => {
-    if (!SUPPORT_ID) {
-      console.warn('Crisp Website ID is not set')
-      return
-    }
-    if (Crisp.isCrispInjected()) return
-    Crisp.configure(SUPPORT_ID)
+    if (!id || Crisp.isCrispInjected()) return
+    Crisp.configure(id)
     Crisp.setHideOnMobile(true)
-  }, [])
+  }, [id])
 
   return null
 }