101 lines
2.1 KiB
JavaScript
101 lines
2.1 KiB
JavaScript
---
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layout: compress
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permalink: /:basename.min.js
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# PWA service worker
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---
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const swconfUrl = '{{ '/assets/js/data/swconf.js' | relative_url }}';
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importScripts(swconfUrl);
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const purge = swconf.purge;
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function verifyHost(url) {
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for (const host of swconf.allowHosts) {
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const regex = RegExp(`^http(s)?://${host}/`);
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if (regex.test(url)) {
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return true;
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}
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}
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return false;
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}
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function verifyUrl(url) {
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if (!verifyHost(url)) {
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return false;
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}
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const requestPath = new URL(url).pathname;
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for (const path of swconf.denyPaths) {
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if (requestPath.startsWith(path)) {
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return false;
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}
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}
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return true;
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}
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if (!purge) {
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swconf.allowHosts.push(location.host);
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}
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self.addEventListener('install', (event) => {
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if (purge) {
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return;
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}
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event.waitUntil(
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caches.open(swconf.cacheName).then((cache) => {
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return cache.addAll(swconf.resources);
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})
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);
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});
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self.addEventListener('activate', (event) => {
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event.waitUntil(
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caches.keys().then((keyList) => {
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return Promise.all(
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keyList.map((key) => {
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if (purge) {
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return caches.delete(key);
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} else {
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if (key !== swconf.cacheName) {
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return caches.delete(key);
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}
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}
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})
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);
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})
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);
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});
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self.addEventListener('message', (event) => {
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if (event.data === 'SKIP_WAITING') {
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self.skipWaiting();
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}
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});
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self.addEventListener('fetch', (event) => {
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event.respondWith(
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caches.match(event.request).then((response) => {
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if (response) {
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return response;
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}
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return fetch(event.request).then((response) => {
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const url = event.request.url;
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if (purge || event.request.method !== 'GET' || !verifyUrl(url)) {
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return response;
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}
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{% comment %}See: <https://developers.google.com/web/fundamentals/primers/service-workers#cache_and_return_requests>{% endcomment %}
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let responseToCache = response.clone();
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caches.open(swconf.cacheName).then((cache) => {
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cache.put(event.request, responseToCache);
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});
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return response;
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});
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})
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);
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});
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