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soundwave/docs/PWA_IMPLEMENTATION.md
Iulian 51679d1943 Initial commit - SoundWave v1.0 
- Full PWA support with offline capabilities
- Comprehensive search across songs, playlists, and channels
- Offline playlist manager with download tracking
- Pre-built frontend for zero-build deployment
- Docker-based deployment with docker compose
- Material-UI dark theme interface
- YouTube audio download and management
- Multi-user authentication support
2025-12-16 23:43:07 +00:00

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SoundWave PWA Implementation

Overview

SoundWave is now a fully-featured Progressive Web App (PWA) with offline capabilities, installability, and native app-like experience.

Features Implemented

1. Service Worker

  • Location: frontend/public/service-worker.js
  • Caching Strategies:
    • Network First: API requests, HTML pages (with cache fallback)
    • Cache First: Audio files, images (with network fallback)
    • Stale While Revalidate: JS/CSS static assets
  • Background Sync: Pending uploads and favorites sync when online
  • Push Notifications: Support for push notifications
  • Cache Management: Separate caches for static, API, audio, and images

2. Web App Manifest

  • Location: frontend/public/manifest.json
  • Features:
    • App metadata (name, description, icons)
    • Display mode: standalone (native app-like)
    • Theme colors and background
    • App shortcuts (Home, Search, Library, Local Files)
    • Share target (share audio files to app)
    • Icon sizes: 72px to 512px
    • Screenshots for app stores

3. PWA Manager

  • Location: frontend/src/utils/pwa.ts
  • Capabilities:
    • Service worker registration
    • Install prompt handling
    • Update management
    • Cache control
    • Notification permissions
    • Online/offline detection
    • Cache size estimation

4. PWA Context Provider

  • Location: frontend/src/context/PWAContext.tsx
  • Global State:
    • Online/offline status
    • Installation state
    • Update availability
    • Cache size
    • Notification permissions

5. UI Components

PWA Prompts (PWAPrompts.tsx)

  • Offline alert (persistent)
  • Back online notification
  • Install app prompt (delayed 3s)
  • Update available prompt
  • Visual online/offline indicator

PWA Settings Card (PWASettingsCard.tsx)

  • Connection status display
  • Install app button
  • Update app button
  • Cache management (size display, clear cache)
  • Notification toggle
  • PWA features list

Splash Screen (SplashScreen.tsx)

  • Loading screen for PWA startup
  • App logo and branding

6. PWA-Specific Styles

  • Location: frontend/src/styles/pwa.css
  • Optimizations:
    • Touch target sizes (44x44px minimum)
    • Touch feedback animations
    • Safe area insets for notched devices
    • iOS scrolling optimizations
    • Prevent zoom on input focus
    • Loading skeletons
    • Responsive utilities
    • Dark mode support
    • Reduced motion support
    • High contrast mode
    • Landscape orientation adjustments

7. Media Session API

  • Location: frontend/src/utils/mediaSession.ts
  • Features:
    • Media controls in notification tray
    • Lock screen controls
    • Playback state management
    • Position state for seek bar
    • Metadata display (title, artist, album, artwork)

8. Offline Storage

  • Location: frontend/src/utils/offlineStorage.ts
  • IndexedDB Stores:
    • Audio queue
    • Favorites
    • Playlists
    • Settings
    • Pending uploads
  • Background sync for offline actions

9. Enhanced HTML

  • Location: frontend/index.html
  • Meta Tags:
    • PWA meta tags
    • Apple mobile web app capable
    • Theme color
    • Open Graph tags
    • Twitter cards
    • Multiple icon sizes
    • Manifest link

How to Use

For Users

Install the App

  1. Desktop (Chrome/Edge):

    • Click the install icon in the address bar
    • Or click "Install App" button in Settings > PWA

  2. Mobile (Chrome/Safari):

    • Tap the "Add to Home Screen" prompt
    • Or use browser menu > "Add to Home Screen"

Offline Usage

  • Previously viewed content is cached automatically
  • Audio files can be cached for offline playback
  • App works offline with cached data
  • Changes sync when connection is restored

Update the App

  • Notification appears when update is available
  • Click "Update" to install new version
  • App reloads with latest features

For Developers

Test PWA Locally

cd frontend
npm run build
npm run preview

Generate PWA Icons

  1. Use PWA Builder Image Generator
  2. Upload a 512x512 PNG logo
  3. Download generated icons
  4. Place in frontend/public/img/

Required sizes:

  • 72x72, 96x96, 128x128, 144x144
  • 152x152, 192x192, 384x384, 512x512

Test Service Worker

// In browser console
navigator.serviceWorker.ready.then(registration => {
  console.log('Service Worker registered:', registration);
});

// Check cache
caches.keys().then(keys => console.log('Cache keys:', keys));

Debug Offline Mode

  1. Open DevTools > Application > Service Workers
  2. Check "Offline" checkbox
  3. Reload page to test offline functionality

Browser Support

Desktop

  • ✅ Chrome 80+
  • ✅ Edge 80+
  • ✅ Firefox 90+
  • ⚠️ Safari 15+ (limited features)

Mobile

  • ✅ Chrome Android 80+
  • ✅ Safari iOS 15+
  • ✅ Samsung Internet 12+

Features by Platform

All Platforms

  • ✅ Offline caching
  • ✅ Install to home screen
  • ✅ Push notifications
  • ✅ Background sync

Desktop Only

  • ✅ Window controls overlay
  • ✅ App shortcuts in taskbar
  • ✅ Badge API

Mobile Only

  • ✅ Share target API
  • ✅ Media session API
  • ✅ Safe area insets

Performance Optimizations

Code Splitting

  • Vendor bundle (React, React DOM, React Router)
  • MUI bundle (@mui/material, @mui/icons-material)
  • Lazy loading for routes

Caching Strategy

  • Static assets: Stale-while-revalidate
  • API: Network-first with cache fallback
  • Audio: Cache-first with network fallback
  • Images: Cache-first with network fallback

Bundle Size

  • Service worker: ~12KB
  • PWA utilities: ~8KB
  • Total overhead: ~20KB

Security Considerations

HTTPS Required

PWA features require HTTPS in production. Service workers only work on:

  • https:// domains
  • localhost (for development)

Content Security Policy

Update CSP headers to allow:

  • Service worker scripts
  • Manifest file
  • Media files

Cache Invalidation

Caches are versioned and automatically cleaned up on service worker update.

Troubleshooting

Service Worker Not Registering

  1. Check browser console for errors
  2. Verify HTTPS or localhost
  3. Check service worker file path
  4. Clear browser cache

Install Prompt Not Showing

  1. Must be served over HTTPS
  2. User hasn't installed before
  3. User hasn't dismissed recently
  4. All PWA criteria must be met

Offline Content Not Loading

  1. Check service worker is active
  2. Verify content was cached
  3. Check cache names in DevTools
  4. Test network conditions

Update Not Applying

  1. Close all tabs
  2. Clear service worker in DevTools
  3. Hard refresh (Ctrl+Shift+R)
  4. Reinstall the app

Next Steps

  1. Generate Production Icons

    • Create high-quality 512x512 app icon
    • Generate all required sizes
    • Add to public/img/ directory

  2. Configure Push Notifications

    • Set up push notification server
    • Add VAPID keys
    • Implement backend push endpoint

  3. Test on Real Devices

    • Test install flow on iOS/Android
    • Verify offline functionality
    • Check media controls

  4. Monitor Performance

    • Use Lighthouse PWA audit
    • Track cache hit rates
    • Monitor service worker updates

  5. App Store Submission

    • Package as TWA (Android)
    • Submit to Google Play Store
    • Consider iOS App Store (limited)

Resources