Rafael Foster
303 lines
9.5 KiB
JavaScript
303 lines
9.5 KiB
JavaScript
/**
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* Modul: Service Worker
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* Zweck: Offline-Fähigkeit, differenzierte Caching-Strategien, Update-Notification
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* Abhängigkeiten: keine
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*
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* Caching-Strategien:
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* APP_SHELL (HTML + kritische JS/CSS): Cache-First (frisch vorgeladen via install)
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* PAGE_MODULES (Seiten-JS): Cache-First (frisch vorgeladen via install)
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* ASSETS (Bilder, Icons): Cache-First, lazily gecacht, bei SW-Update geleert
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* API: Immer Netzwerk (kein Caching von Nutzerdaten)
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*
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* Nach SW-Update: alle Requests gehen einmalig cache-bypassed ans Netz
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* → bypassCacheUntil (in-memory + Cache API für SW-Restart-Robustheit)
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*/
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const SHELL_CACHE = 'oikos-shell-v59';
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const PAGES_CACHE = 'oikos-pages-v54';
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const LOCALES_CACHE = 'oikos-locales-v5';
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const ASSETS_CACHE = 'oikos-assets-v54';
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const BYPASS_CACHE = 'oikos-bypass-flag';
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const ALL_CACHES = [SHELL_CACHE, PAGES_CACHE, LOCALES_CACHE, ASSETS_CACHE];
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// App-Shell: sofort benötigt für ersten Render
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const APP_SHELL = [
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'/',
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'/index.html',
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'/api.js',
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'/router.js',
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'/i18n.js',
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'/rrule-ui.js',
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'/reminders.js',
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'/sw-register.js',
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'/lucide.min.js',
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'/styles/tokens.css',
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'/styles/reset.css',
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'/styles/pwa.css',
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'/styles/layout.css',
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'/styles/glass.css',
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'/styles/login.css',
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'/styles/reminders.css',
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'/styles/dashboard.css',
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'/styles/tasks.css',
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'/styles/shopping.css',
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'/styles/meals.css',
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'/styles/calendar.css',
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'/styles/notes.css',
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'/styles/contacts.css',
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'/styles/birthdays.css',
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'/styles/budget.css',
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'/styles/settings.css',
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'/styles/recipes.css',
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'/components/oikos-install-prompt.js',
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'/offline.html',
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'/manifest.json',
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'/favicon.ico',
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'/icons/favicon-32.png',
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'/icons/apple-touch-icon.png',
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'/icons/icon-192.png',
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'/icons/icon-512.png',
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'/icons/icon-maskable-192.png',
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'/icons/icon-maskable-512.png',
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];
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const APP_LOCALES = [
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'/locales/ar.json',
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'/locales/de.json',
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'/locales/el.json',
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'/locales/en.json',
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'/locales/es.json',
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'/locales/fr.json',
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'/locales/hi.json',
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'/locales/it.json',
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'/locales/ja.json',
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'/locales/pt.json',
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'/locales/ru.json',
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'/locales/sv.json',
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'/locales/tr.json',
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'/locales/uk.json',
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'/locales/zh.json',
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];
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// Seiten-Module: lazy geladen, aber vorab gecacht für Offline
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const PAGE_MODULES = [
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'/pages/dashboard.js',
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'/pages/tasks.js',
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'/pages/shopping.js',
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'/pages/meals.js',
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'/pages/calendar.js',
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'/pages/notes.js',
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'/pages/contacts.js',
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'/pages/birthdays.js',
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'/pages/budget.js',
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'/pages/settings.js',
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'/pages/login.js',
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'/pages/recipes.js',
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];
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// --------------------------------------------------------
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// Bypass-Flag: nach SW-Update einmalig alles frisch vom Netz laden.
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// In-Memory-Variable (schnell) + Cache API (SW-Restart-sicher).
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// --------------------------------------------------------
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let bypassCacheUntil = 0;
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// Beim SW-Prozess-Start: Flag aus Cache API wiederherstellen.
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// Nötig falls Chrome den SW zwischen activate und erstem Fetch terminiert hat.
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let _bypassInitDone = false;
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const _bypassInit = (async () => {
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try {
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const c = await caches.open(BYPASS_CACHE);
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const r = await c.match('/active');
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if (r) {
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const until = parseInt(r.headers.get('x-until') || '0');
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if (Date.now() < until) {
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bypassCacheUntil = until;
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} else {
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await c.delete('/active'); // abgelaufen, aufräumen
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}
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}
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} catch { /* Fehler ignorieren */ }
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_bypassInitDone = true;
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})();
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// --------------------------------------------------------
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// Install: App-Shell + Seiten-Module vorab cachen
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// cache: 'reload' umgeht den HTTP-Cache → immer frische Dateien
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// --------------------------------------------------------
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self.addEventListener('install', (event) => {
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const freshShell = APP_SHELL.map((url) => new Request(url, { cache: 'reload' }));
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const freshModules = PAGE_MODULES.map((url) => new Request(url, { cache: 'reload' }));
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const freshLocales = APP_LOCALES.map((url) => new Request(url, { cache: 'reload' }));
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event.waitUntil(
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Promise.all([
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caches.open(SHELL_CACHE).then((c) => c.addAll(freshShell)),
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caches.open(PAGES_CACHE).then((c) => c.addAll(freshModules)),
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caches.open(LOCALES_CACHE).then((c) => c.addAll(freshLocales)),
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]).then(() => self.skipWaiting())
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);
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});
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// --------------------------------------------------------
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// Activate: Alte Cache-Versionen löschen + Bypass setzen + Clients informieren
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// --------------------------------------------------------
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self.addEventListener('activate', (event) => {
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event.waitUntil(
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caches.keys().then((keys) =>
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Promise.all(
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keys
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.filter((key) => !ALL_CACHES.includes(key))
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.map((key) => caches.delete(key))
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)
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)
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// Assets-Cache leeren: lazily gecachte Bilder/Icons werden sonst nie erneuert.
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.then(() => caches.delete(ASSETS_CACHE))
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.then(async () => {
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// Bypass-Fenster setzen: nach SW-Update lädt die nächste Seite alles frisch.
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// KEIN künstliches waitUntil-Delay hier — Chrome würde clients.claim()
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// / controllerchange erst nach Ablauf der waitUntil-Promise feuern,
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// was dazu führt dass bypassCacheUntil gerade abläuft wenn der Reload kommt.
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const bypassUntil = Date.now() + 30000;
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bypassCacheUntil = bypassUntil;
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// Cache API: überlebt SW-Prozess-Terminierung zwischen activate und Reload
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try {
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const c = await caches.open(BYPASS_CACHE);
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await c.put('/active', new Response('1', {
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headers: { 'x-until': String(bypassUntil) },
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}));
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} catch { /* Fehler ignorieren */ }
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self.clients.claim();
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self.clients.matchAll({ type: 'window' }).then((clients) => {
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clients.forEach((client) => client.postMessage({ type: 'SW_UPDATED' }));
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});
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})
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);
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});
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// --------------------------------------------------------
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// Fetch: Strategie je nach Request-Typ
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// --------------------------------------------------------
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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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if (url.pathname.startsWith('/api/')) return;
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if (request.method !== 'GET') return;
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// Erste Fetch-Events nach SW-Start: auf Cache-API-Initialisierung warten,
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// damit bypassCacheUntil korrekt gesetzt ist bevor wir entscheiden.
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if (!_bypassInitDone) {
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event.respondWith(
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_bypassInit.then(() => dispatchFetch(request, url))
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);
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return;
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}
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event.respondWith(dispatchFetch(request, url));
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});
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function dispatchFetch(request, url) {
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// Nach SW-Update: direkt vom Netz, kein SW-Cache, kein HTTP-Cache.
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// Gilt für ALLE Requests (JS, CSS, Images, HTML) im Bypass-Fenster.
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if (Date.now() < bypassCacheUntil) {
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return fetch(new Request(request, { cache: 'no-cache' })).catch(async () => {
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const cached = await caches.match(request)
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|| await caches.match('/index.html')
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|| await caches.match('/offline.html');
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return cached || new Response('Offline', {
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status: 503,
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headers: { 'Content-Type': 'text/plain; charset=utf-8' },
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});
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});
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}
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// Bypass abgelaufen: Cache API Flag aufräumen (lazy, beim ersten Request danach)
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if (bypassCacheUntil !== 0) {
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bypassCacheUntil = 0;
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caches.open(BYPASS_CACHE).then(c => c.delete('/active')).catch(() => {});
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}
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if (request.mode === 'navigate') {
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return networkFirst(request, SHELL_CACHE);
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}
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if (url.pathname.startsWith('/locales/')) {
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return networkFirst(request, LOCALES_CACHE);
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}
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if (url.pathname.startsWith('/pages/')) {
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return networkFirst(request, PAGES_CACHE);
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}
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if (url.origin === self.location.origin && isMutableAppResource(url.pathname)) {
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return networkFirst(request, SHELL_CACHE);
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}
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if (isAsset(url.pathname) && url.origin === self.location.origin) {
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return cacheFirst(request, ASSETS_CACHE);
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}
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return cacheFirst(request, SHELL_CACHE);
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}
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// --------------------------------------------------------
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// Strategie: Network-First (für Navigation Requests)
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// --------------------------------------------------------
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async function networkFirst(request, cacheName) {
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const cache = await caches.open(cacheName);
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try {
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const response = await fetch(request);
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if (response.ok && response.type === 'basic') {
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cache.put(request, response.clone());
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}
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return response;
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} catch {
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const cached = await cache.match(request);
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if (cached) return cached;
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const shell = await cache.match('/index.html');
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if (shell) return shell;
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const offline = await caches.match('/offline.html');
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if (offline) return offline;
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return new Response('Keine Verbindung', {
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status: 503,
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headers: { 'Content-Type': 'text/plain; charset=utf-8' },
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});
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}
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}
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// --------------------------------------------------------
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// Strategie: Cache-First (für Shell, Pages, Assets)
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// --------------------------------------------------------
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async function cacheFirst(request, cacheName) {
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const cache = await caches.open(cacheName);
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const cached = await cache.match(request);
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if (cached) return cached;
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try {
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const response = await fetch(request);
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if (response.ok) cache.put(request, response.clone());
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return response;
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} catch {
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return new Response('', { status: 408 });
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}
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}
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// --------------------------------------------------------
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// Hilfsfunktionen
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// --------------------------------------------------------
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function isAsset(pathname) {
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return /\.(png|jpg|jpeg|ico|svg|webp|woff2?|gif)$/i.test(pathname);
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}
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function isMutableAppResource(pathname) {
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return pathname === '/'
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|| pathname === '/index.html'
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|| pathname === '/manifest.json'
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|| /\.(css|js|json|html)$/i.test(pathname);
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}
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