99 lines
2.9 KiB
JavaScript
99 lines
2.9 KiB
JavaScript
// caches polyfill because it is not added to native yet!
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var log = require('./lib/log');
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var caches = require('./thirdparty/serviceworker-caches');
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if (debug) {
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log('SW: debug is on');
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log(`SW: CACHE_NAME: ${CACHE_NAME}`);
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log(`SW: appDomain: ${appDomain}`);
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log(`SW: lang: ${lang}`);
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}
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if (typeof self.CACHE_NAME !== 'string') {
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throw new Error('Cache Name cannot be empty');
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}
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self.addEventListener('fetch', (event) => {
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// skip non-get
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if (event.request.method !== 'GET') {
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return;
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}
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//Parse the url
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const requestURL = new URL(event.request.url);
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//Check for our own urls
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/*if (requestURL.origin !== location.origin) {
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log('SW: skip external ' + event.request.url);
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return;
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}*/
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//Skip admin url's
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if (
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requestURL.pathname.indexOf('admin') >= 0 ||
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requestURL.pathname.indexOf('Security') >= 0 ||
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requestURL.pathname.indexOf('dev') >= 0
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) {
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log(`SW: skip admin ${ event.request.url}`);
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return;
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}
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//Test for images
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/*if (/\.(jpg|jpeg|png|gif|webp)$/.test(requestURL.pathname)) {
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log('SW: skip image ' + event.request.url);
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//For now we skip images but change this later to maybe some caching and/or an offline fallback
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return;
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}*/
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// Clone the request for fetch and cache
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// A request is a stream and can be consumed only once.
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const fetchRequest = event.request.clone(),
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cacheRequest = event.request.clone();
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// Respond with content from fetch or cache
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event.respondWith(
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// Try fetch
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fetch(fetchRequest)
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// when fetch is successful, we update the cache
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.then((response) => {
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// A response is a stream and can be consumed only once.
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// Because we want the browser to consume the response,
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// as well as cache to consume the response, we need to
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// clone it so we have 2 streams
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const responseToCache = response.clone();
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// and update the cache
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caches.open(self.CACHE_NAME).then((cache) => {
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// Clone the request again to use it
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// as the key for our cache
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const cacheSaveRequest = event.request.clone();
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cache.put(cacheSaveRequest, responseToCache);
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});
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// Return the response stream to be consumed by browser
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return response;
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})
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// when fetch times out or fails
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.catch((err) => {
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log('SW: fetch failed');
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// Return the promise which
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// resolves on a match in cache for the current request
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// or rejects if no matches are found
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return caches.match(cacheRequest);
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}),
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);
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});
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// Now we need to clean up resources in the previous versions
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// of Service Worker scripts
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self.addEventListener('activate', (event) => {
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log(`SW: activated: ${version}`);
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// Destroy the cache
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event.waitUntil(caches.delete(self.CACHE_NAME));
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});
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self.addEventListener('install', (e) => {
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log(`SW: installing version: ${version}`);
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});
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