96 lines
2.4 KiB
JavaScript
96 lines
2.4 KiB
JavaScript
const timestamp = '__timestamp__'
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const ASSETS = `cache${timestamp}`
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// `shell` is an array of all the files generated by webpack,
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// `assets` is an array of everything in the `assets` directory
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const toCache = __shell__.concat(__assets__)
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const cached = new Set(toCache)
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// `routes` is an array of `{ pattern: RegExp }` objects that
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// match the pages in your app
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const routes = __routes__
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self.addEventListener('install', event => {
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event.waitUntil(
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caches
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.open(ASSETS)
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.then(cache => cache.addAll(toCache))
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.then(() => {
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self.skipWaiting()
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})
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)
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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(async keys => {
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// delete old caches
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for (const key of keys) {
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if (key !== ASSETS) {
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await caches.delete(key)
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}
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}
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await self.clients.claim()
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})
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)
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})
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const CACHE_FIRST = [
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'/system/accounts/avatars'
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]
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self.addEventListener('fetch', event => {
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const req = event.request
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const url = new URL(req.url)
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// don't try to handle e.g. data: URIs
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if (!url.protocol.startsWith('http')) {
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return
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}
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// always serve assets and webpack-generated files from cache
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if (cached.has(url.pathname)) {
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event.respondWith(caches.match(req))
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return
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}
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// for pages, you might want to serve a shell `index.html` file,
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// which Sapper has generated for you. It's not right for every
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// app, but if it's right for yours then uncomment this section
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if (url.origin === self.origin && routes.find(route => route.pattern.test(url.pathname))) {
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event.respondWith(caches.match('/index.html'))
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return
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}
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// For non-GET requests, go network-only
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if (req.method !== 'GET') {
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event.respondWith(fetch(req))
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return
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}
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// For these, go cache-first.
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if (CACHE_FIRST.some(pattern => url.pathname.startsWith(pattern))) {
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event.respondWith(caches
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.open(`offline${timestamp}`)
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.then(async cache => {
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let response = await cache.match(req)
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if (response) {
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// update asynchronously
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fetch(req).then(response => {
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cache.put(req, response.clone())
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})
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return response
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}
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response = await fetch(req)
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cache.put(req, response.clone())
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return response
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}))
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return
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}
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// for everything else, go network-only
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event.respondWith(fetch(req))
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})
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