56 lines
2.6 KiB
JavaScript
56 lines
2.6 KiB
JavaScript
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// Caution! Be sure you understand the caveats before publishing an application with
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// offline support. See https://aka.ms/blazor-offline-considerations
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self.importScripts('./service-worker-assets.js');
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self.addEventListener('install', event => event.waitUntil(onInstall(event)));
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self.addEventListener('activate', event => event.waitUntil(onActivate(event)));
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self.addEventListener('fetch', event => event.respondWith(onFetch(event)));
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const cacheNamePrefix = 'offline-cache-';
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const cacheName = `${cacheNamePrefix}${self.assetsManifest.version}`;
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const offlineAssetsInclude = [ /\.dll$/, /\.pdb$/, /\.wasm/, /\.html/, /\.js$/, /\.json$/, /\.css$/, /\.woff$/, /\.png$/, /\.jpe?g$/, /\.gif$/, /\.ico$/, /\.blat$/, /\.dat$/ ];
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const offlineAssetsExclude = [ /^service-worker\.js$/ ];
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// Replace with your base path if you are hosting on a subfolder. Ensure there is a trailing '/'.
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const base = "/";
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const baseUrl = new URL(base, self.origin);
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const manifestUrlList = self.assetsManifest.assets.map(asset => new URL(asset.url, baseUrl).href);
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async function onInstall(event) {
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console.info('Service worker: Install');
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// Fetch and cache all matching items from the assets manifest
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const assetsRequests = self.assetsManifest.assets
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.filter(asset => offlineAssetsInclude.some(pattern => pattern.test(asset.url)))
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.filter(asset => !offlineAssetsExclude.some(pattern => pattern.test(asset.url)))
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.map(asset => new Request(asset.url, { integrity: asset.hash, cache: 'no-cache' }));
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await caches.open(cacheName).then(cache => cache.addAll(assetsRequests));
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}
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async function onActivate(event) {
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console.info('Service worker: Activate');
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// Delete unused caches
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const cacheKeys = await caches.keys();
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await Promise.all(cacheKeys
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.filter(key => key.startsWith(cacheNamePrefix) && key !== cacheName)
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.map(key => caches.delete(key)));
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}
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async function onFetch(event) {
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let cachedResponse = null;
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if (event.request.method === 'GET') {
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// For all navigation requests, try to serve index.html from cache,
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// unless that request is for an offline resource.
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// If you need some URLs to be server-rendered, edit the following check to exclude those URLs
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const shouldServeIndexHtml = event.request.mode === 'navigate'
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&& !manifestUrlList.some(url => url === event.request.url);
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const request = shouldServeIndexHtml ? 'index.html' : event.request;
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const cache = await caches.open(cacheName);
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cachedResponse = await cache.match(request);
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}
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return cachedResponse || fetch(event.request);
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}
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