web/_javascript/pwa/sw.js

102 lines
2.2 KiB
JavaScript
Raw Normal View History

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