1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
// Caution! Be sure you understand the caveats before publishing an application with
// offline support. See https://aka.ms/blazor-offline-considerations
self.importScripts('./service-worker-assets.js');
self.addEventListener('install', event => event.waitUntil(onInstall(event)));
self.addEventListener('activate', event => event.waitUntil(onActivate(event)));
self.addEventListener('fetch', event => event.respondWith(onFetch(event)));
const cacheNamePrefix = 'offline-cache-';
const cacheName = `${cacheNamePrefix}${self.assetsManifest.version}`;
const offlineAssetsInclude = [ /\.dll$/, /\.pdb$/, /\.wasm/, /\.html/, /\.js$/, /\.json$/, /\.css$/, /\.woff$/, /\.png$/, /\.jpe?g$/, /\.gif$/, /\.ico$/, /\.blat$/, /\.dat$/ ];
const offlineAssetsExclude = [ /^service-worker\.js$/ ];
// Replace with your base path if you are hosting on a subfolder. Ensure there is a trailing '/'.
const base = "/";
const baseUrl = new URL(base, self.origin);
const manifestUrlList = self.assetsManifest.assets.map(asset => new URL(asset.url, baseUrl).href);
async function onInstall(event) {
console.info('Service worker: Install');
// Fetch and cache all matching items from the assets manifest
const assetsRequests = self.assetsManifest.assets
.filter(asset => offlineAssetsInclude.some(pattern => pattern.test(asset.url)))
.filter(asset => !offlineAssetsExclude.some(pattern => pattern.test(asset.url)))
.map(asset => new Request(asset.url, { integrity: asset.hash, cache: 'no-cache' }));
await caches.open(cacheName).then(cache => cache.addAll(assetsRequests));
}
async function onActivate(event) {
console.info('Service worker: Activate');
// Delete unused caches
const cacheKeys = await caches.keys();
await Promise.all(cacheKeys
.filter(key => key.startsWith(cacheNamePrefix) && key !== cacheName)
.map(key => caches.delete(key)));
}
async function onFetch(event) {
let cachedResponse = null;
if (event.request.method === 'GET') {
// For all navigation requests, try to serve index.html from cache,
// unless that request is for an offline resource.
// If you need some URLs to be server-rendered, edit the following check to exclude those URLs
const shouldServeIndexHtml = event.request.mode === 'navigate'
&& !manifestUrlList.some(url => url === event.request.url);
const request = shouldServeIndexHtml ? 'index.html' : event.request;
const cache = await caches.open(cacheName);
cachedResponse = await cache.match(request);
}
return cachedResponse || fetch(event.request);
}
|
