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import { timestamp, files, shell, routes } from '@sapper/service-worker';
const ASSETS = `cache${timestamp}`;
const nonRootFiles = files.map(f => "/Aurora-data" + f);
const nonRootShell = shell.map(f => "/Aurora-data" + f);
// `shell` is an array of all the files generated by the bundler,
// `files` is an array of everything in the `static` directory
const to_cache = nonRootShell.concat(nonRootFiles);
const cached = new Set(to_cache);
self.addEventListener('install', <EventType extends ExtendableEvent>(event: EventType) => {
event.waitUntil(
caches
.open(ASSETS)
.then(cache => cache.addAll(to_cache))
.then(() => {
((self as any) as ServiceWorkerGlobalScope).skipWaiting();
})
);
});
self.addEventListener('activate', <EventType extends ExtendableEvent>(event: EventType) => {
event.waitUntil(
caches.keys().then(async keys => {
// delete old caches
for (const key of keys) {
if (key !== ASSETS) await caches.delete(key);
}
((self as any) as ServiceWorkerGlobalScope).clients.claim();
})
);
});
self.addEventListener('fetch', <EventType extends FetchEvent>(event: EventType) => {
if (event.request.method !== 'GET' || event.request.headers.has('range')) return;
const url = new URL(event.request.url);
// don't try to handle e.g. data: URIs
if (!url.protocol.startsWith('http')) return;
// ignore dev server requests
if (url.hostname === self.location.hostname && url.port !== self.location.port) return;
// always serve static files and bundler-generated assets from cache
if (url.host === self.location.host && cached.has(url.pathname)) {
event.respondWith(caches.match(event.request));
return;
}
// for pages, you might want to serve a shell `service-worker-index.html` file,
// which Sapper has generated for you. It's not right for every
// app, but if it's right for yours then uncomment this section
/*
if (url.origin === self.origin && routes.find(route => route.pattern.test(url.pathname))) {
event.respondWith(caches.match('/service-worker-index.html'));
return;
}
*/
if (event.request.cache === 'only-if-cached') return;
// for everything else, try the network first, falling back to
// cache if the user is offline. (If the pages never change, you
// might prefer a cache-first approach to a network-first one.)
event.respondWith(
caches
.open(`offline${timestamp}`)
.then(async cache => {
try {
const response = await fetch(event.request);
cache.put(event.request, response.clone());
return response;
} catch(err) {
const response = await cache.match(event.request);
if (response) return response;
throw err;
}
})
);
});
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