83 lines
2.2 KiB
JavaScript
83 lines
2.2 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((async function () {
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let cache = await caches.open(ASSETS)
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await cache.addAll(toCache)
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self.skipWaiting()
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})())
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})
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self.addEventListener('activate', event => {
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event.waitUntil((async function () {
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let keys = await caches.keys()
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// delete old caches
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for (let 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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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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event.respondWith((async function () {
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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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return caches.match(req)
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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 &&
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routes.find(route => route.pattern.test(url.pathname))) {
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return caches.match('/index.html')
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}
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// For these GET requests, go cache-first
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if (req.method === 'GET' &&
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CACHE_FIRST.some(pattern => url.pathname.startsWith(pattern))) {
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let cache = await caches.open(`offline${timestamp}`)
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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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// for everything else, go network-only
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return fetch(req)
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})())
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})
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