pinafore/templates/service-worker.js

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