pinafore/templates/service-worker.js

83 lines
2.2 KiB
JavaScript
Raw Normal View History

2018-01-14 23:54:26 +01:00
const timestamp = '__timestamp__'
const ASSETS = `cache${timestamp}`
2018-01-07 00:51:25 +01:00
// `shell` is an array of all the files generated by webpack,
// `assets` is an array of everything in the `assets` directory
2018-02-09 07:29:29 +01:00
const toCache = __shell__.concat(__assets__)
const cached = new Set(toCache)
2018-01-07 00:51:25 +01:00
// `routes` is an array of `{ pattern: RegExp }` objects that
// match the pages in your app
2018-01-14 23:54:26 +01:00
const routes = __routes__
2018-01-07 00:51:25 +01:00
self.addEventListener('install', event => {
event.waitUntil((async function () {
let cache = await caches.open(ASSETS)
await cache.addAll(toCache)
self.skipWaiting()
})())
2018-01-14 23:54:26 +01:00
})
2018-01-07 00:51:25 +01:00
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)
2018-01-14 23:54:26 +01:00
}
}
await self.clients.claim()
})())
2018-01-14 23:54:26 +01:00
})
2018-01-07 00:51:25 +01:00
2018-01-15 02:13:42 +01:00
const CACHE_FIRST = [
'/system/accounts/avatars'
]
2018-01-07 00:51:25 +01:00
self.addEventListener('fetch', event => {
2018-01-15 02:13:42 +01:00
const req = event.request
const url = new URL(req.url)
2018-01-07 00:51:25 +01:00
2018-01-14 23:54:26 +01:00
// don't try to handle e.g. data: URIs
if (!url.protocol.startsWith('http')) {
2018-02-09 07:29:29 +01:00
return
2018-01-14 23:54:26 +01:00
}
2018-01-07 00:51:25 +01:00
event.respondWith((async function () {
// always serve assets and webpack-generated files from cache
if (cached.has(url.pathname)) {
return caches.match(req)
}
2018-01-07 00:51:25 +01:00
// 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
2018-01-07 00:51:25 +01:00
if (url.origin === self.origin &&
routes.find(route => route.pattern.test(url.pathname))) {
return caches.match('/index.html')
}
2018-01-07 00:51:25 +01:00
// 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())
})
2018-01-15 02:13:42 +01:00
return response
}
response = await fetch(req)
cache.put(req, response.clone())
return response
}
2018-01-15 02:13:42 +01:00
// for everything else, go network-only
return fetch(req)
})())
2018-01-14 23:54:26 +01:00
})