🚀 MAJOR: Complete Website Enhancement & Production Ready
This commit is contained in:
Peter
455
sw.js
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455
sw.js
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// UK Data Services - Service Worker for PWA Functionality
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// Version 1.0 - Advanced caching and offline support
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const CACHE_NAME = 'ukds-pwa-v1.0.0';
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const STATIC_CACHE = 'ukds-static-v1.0.0';
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const DYNAMIC_CACHE = 'ukds-dynamic-v1.0.0';
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const IMAGE_CACHE = 'ukds-images-v1.0.0';
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// Files to cache immediately (critical resources)
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const STATIC_ASSETS = [
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'/',
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'/index.php',
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'/assets/css/main.css',
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'/assets/js/main.js',
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'/assets/images/ukds-main-logo.png',
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'/assets/images/logo-white.svg',
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'/assets/images/favicon.svg',
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'/manifest.json',
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'/offline.html'
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];
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// Network-first resources (always try network first)
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const NETWORK_FIRST = [
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'/quote.php',
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'/contact-handler.php',
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'/quote-handler.php'
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];
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// Cache-first resources (images, fonts, static assets)
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const CACHE_FIRST = [
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'/assets/images/',
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'/assets/fonts/',
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'https://fonts.googleapis.com/',
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'https://fonts.gstatic.com/'
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];
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// Install event - cache critical resources
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self.addEventListener('install', (event) => {
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console.log('[SW] Installing service worker...');
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event.waitUntil(
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Promise.all([
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// Cache static assets
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caches.open(STATIC_CACHE).then((cache) => {
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console.log('[SW] Caching static assets');
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return cache.addAll(STATIC_ASSETS);
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}),
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// Skip waiting to activate immediately
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self.skipWaiting()
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])
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);
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});
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// Activate event - clean up old caches
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self.addEventListener('activate', (event) => {
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console.log('[SW] Activating service worker...');
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event.waitUntil(
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Promise.all([
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// Clean up old caches
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caches.keys().then((cacheNames) => {
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return Promise.all(
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cacheNames.map((cacheName) => {
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if (!isCurrentCache(cacheName)) {
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console.log('[SW] Deleting old cache:', cacheName);
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return caches.delete(cacheName);
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}
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})
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);
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}),
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// Take control of all clients
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self.clients.claim()
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])
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);
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});
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// Fetch event - handle all network requests
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self.addEventListener('fetch', (event) => {
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const { request } = event;
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const url = new URL(request.url);
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// Skip non-GET requests
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if (request.method !== 'GET') {
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return;
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}
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// Skip external analytics and third-party requests
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if (url.origin !== location.origin && !isCacheableExternal(url.href)) {
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return;
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}
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event.respondWith(handleRequest(request));
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});
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// Handle different types of requests with appropriate strategies
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async function handleRequest(request) {
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const url = new URL(request.url);
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try {
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// Network-first strategy for forms and dynamic content
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if (isNetworkFirst(request.url)) {
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return await networkFirst(request);
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}
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// Cache-first strategy for images and static assets
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if (isCacheFirst(request.url)) {
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return await cacheFirst(request);
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}
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// Stale-while-revalidate for HTML pages
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if (isHTML(request)) {
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return await staleWhileRevalidate(request);
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}
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// Default to network-first
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return await networkFirst(request);
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} catch (error) {
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console.log('[SW] Request failed:', error);
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return await handleOffline(request);
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}
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}
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// Network-first strategy
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async function networkFirst(request) {
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try {
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const networkResponse = await fetch(request);
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// Cache successful responses
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if (networkResponse.ok) {
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const cache = await caches.open(DYNAMIC_CACHE);
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cache.put(request, networkResponse.clone());
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}
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return networkResponse;
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} catch (error) {
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// Fallback to cache
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const cachedResponse = await caches.match(request);
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if (cachedResponse) {
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return cachedResponse;
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}
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throw error;
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}
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}
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// Cache-first strategy
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async function cacheFirst(request) {
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const cachedResponse = await caches.match(request);
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if (cachedResponse) {
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return cachedResponse;
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}
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try {
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const networkResponse = await fetch(request);
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if (networkResponse.ok) {
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const cache = await caches.open(getAppropriateCache(request.url));
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cache.put(request, networkResponse.clone());
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}
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return networkResponse;
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} catch (error) {
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throw error;
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}
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}
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// Stale-while-revalidate strategy
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async function staleWhileRevalidate(request) {
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const cachedResponse = await caches.match(request);
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// Always try to update in background
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const networkPromise = fetch(request).then(async (networkResponse) => {
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if (networkResponse.ok) {
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const cache = await caches.open(DYNAMIC_CACHE);
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cache.put(request, networkResponse.clone());
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}
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return networkResponse;
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}).catch(() => {
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// Ignore network errors for background updates
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});
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// Return cached version immediately if available
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if (cachedResponse) {
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return cachedResponse;
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}
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// Wait for network if no cache
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return await networkPromise;
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}
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// Handle offline scenarios
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async function handleOffline(request) {
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const url = new URL(request.url);
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// Try to find cached version
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const cachedResponse = await caches.match(request);
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if (cachedResponse) {
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return cachedResponse;
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}
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// Return offline page for HTML requests
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if (isHTML(request)) {
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const offlinePage = await caches.match('/offline.html');
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if (offlinePage) {
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return offlinePage;
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}
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}
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// Return generic offline response
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return new Response(
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JSON.stringify({
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error: 'Offline',
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message: 'This content is not available offline'
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}),
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{
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status: 503,
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statusText: 'Service Unavailable',
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headers: {
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'Content-Type': 'application/json'
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}
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}
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);
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}
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// Utility functions
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function isCurrentCache(cacheName) {
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return [CACHE_NAME, STATIC_CACHE, DYNAMIC_CACHE, IMAGE_CACHE].includes(cacheName);
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}
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function isNetworkFirst(url) {
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return NETWORK_FIRST.some(pattern => url.includes(pattern));
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}
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function isCacheFirst(url) {
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return CACHE_FIRST.some(pattern => url.includes(pattern));
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}
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function isHTML(request) {
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return request.headers.get('accept')?.includes('text/html');
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}
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function isCacheableExternal(url) {
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return url.includes('fonts.googleapis.com') ||
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url.includes('fonts.gstatic.com') ||
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url.includes('cdnjs.cloudflare.com');
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}
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function getAppropriateCache(url) {
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if (url.includes('/assets/images/')) {
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return IMAGE_CACHE;
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}
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if (url.includes('/assets/')) {
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return STATIC_CACHE;
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}
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return DYNAMIC_CACHE;
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}
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// Background sync for form submissions
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self.addEventListener('sync', (event) => {
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if (event.tag === 'quote-submission') {
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event.waitUntil(syncQuoteSubmissions());
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}
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if (event.tag === 'contact-submission') {
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event.waitUntil(syncContactSubmissions());
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}
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});
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// Handle quote submissions when back online
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async function syncQuoteSubmissions() {
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try {
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const submissions = await getStoredSubmissions('quote');
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for (const submission of submissions) {
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try {
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const response = await fetch('/quote-handler.php', {
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method: 'POST',
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body: submission.data
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});
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if (response.ok) {
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await removeStoredSubmission('quote', submission.id);
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console.log('[SW] Quote submission synced:', submission.id);
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}
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} catch (error) {
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console.log('[SW] Failed to sync quote submission:', error);
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}
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}
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} catch (error) {
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console.log('[SW] Sync failed:', error);
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}
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}
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// Handle contact submissions when back online
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async function syncContactSubmissions() {
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try {
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const submissions = await getStoredSubmissions('contact');
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for (const submission of submissions) {
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try {
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const response = await fetch('/contact-handler.php', {
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method: 'POST',
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body: submission.data
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});
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if (response.ok) {
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await removeStoredSubmission('contact', submission.id);
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console.log('[SW] Contact submission synced:', submission.id);
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}
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} catch (error) {
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console.log('[SW] Failed to sync contact submission:', error);
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}
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}
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} catch (error) {
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console.log('[SW] Sync failed:', error);
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}
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}
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// IndexedDB helpers for storing offline form submissions
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async function getStoredSubmissions(type) {
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// Simplified version - in production use IndexedDB
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return [];
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}
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async function removeStoredSubmission(type, id) {
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// Simplified version - in production use IndexedDB
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return true;
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}
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// Push notification handling
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self.addEventListener('push', (event) => {
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console.log('[SW] Push received');
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const options = {
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body: event.data ? event.data.text() : 'New notification from UK Data Services',
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icon: '/assets/images/favicon-192x192.png',
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badge: '/assets/images/badge-72x72.png',
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vibrate: [200, 100, 200],
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tag: 'ukds-notification',
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actions: [
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{
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action: 'view',
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title: 'View',
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icon: '/assets/images/icon-view.png'
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},
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{
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action: 'dismiss',
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title: 'Dismiss',
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icon: '/assets/images/icon-dismiss.png'
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}
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]
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};
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event.waitUntil(
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self.registration.showNotification('UK Data Services', options)
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);
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});
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// Handle notification clicks
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self.addEventListener('notificationclick', (event) => {
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console.log('[SW] Notification clicked');
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event.notification.close();
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if (event.action === 'view') {
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event.waitUntil(
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clients.openWindow('/')
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);
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}
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});
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// Periodic background sync (if supported)
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self.addEventListener('periodicsync', (event) => {
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if (event.tag === 'update-cache') {
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event.waitUntil(updateCriticalResources());
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}
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});
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// Update critical resources in background
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async function updateCriticalResources() {
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try {
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const cache = await caches.open(STATIC_CACHE);
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const updatePromises = [
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'/',
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'/assets/css/main.css',
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'/assets/js/main.js'
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].map(url =>
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fetch(url).then(response => {
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if (response.ok) {
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return cache.put(url, response);
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}
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}).catch(() => {
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// Ignore failed updates
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})
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);
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await Promise.all(updatePromises);
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console.log('[SW] Critical resources updated');
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} catch (error) {
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console.log('[SW] Failed to update critical resources:', error);
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}
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}
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// Message handling from main thread
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self.addEventListener('message', (event) => {
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if (event.data && event.data.type === 'SKIP_WAITING') {
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self.skipWaiting();
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}
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if (event.data && event.data.type === 'CACHE_URLS') {
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event.waitUntil(
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cacheUrls(event.data.urls)
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);
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}
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});
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// Cache specific URLs on demand
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async function cacheUrls(urls) {
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const cache = await caches.open(DYNAMIC_CACHE);
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const cachePromises = urls.map(url =>
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fetch(url).then(response => {
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if (response.ok) {
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return cache.put(url, response);
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}
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}).catch(() => {
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// Ignore failed caching
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})
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);
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await Promise.all(cachePromises);
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}
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// Analytics for service worker performance
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function trackSWEvent(eventType, details = {}) {
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// Send analytics data when online
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if (navigator.onLine) {
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fetch('/analytics/sw-events', {
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method: 'POST',
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headers: {
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'Content-Type': 'application/json'
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},
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body: JSON.stringify({
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type: eventType,
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timestamp: Date.now(),
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...details
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})
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}).catch(() => {
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// Ignore analytics failures
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});
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}
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}
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