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sw.js
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sw.js
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var CACHE_NAME = 'qrcode-cache-v1.2';
var urlsToCache = [
'/',
'/assets/qrcode.min.js',
'/assets/style.css',
'/assets/chrome-badge.png'
];
self.addEventListener('install', function(event) {
// Perform install steps
event.waitUntil(caches.open(CACHE_NAME).then(function(cache) {
console.log('Opened cache');
return cache.addAll(urlsToCache);
}));
});
self.addEventListener('fetch', function(event) {
event.respondWith(caches.match(event.request)
.then(function(response) {
// Cache hit - return response
if (response) {
return response;
}
// IMPORTANT: Clone the request. A request is a stream and
// can only be consumed once. Since we are consuming this
// once by cache and once by the browser for fetch, we need
// to clone the response.
var fetchRequest = event.request.clone();
return fetch(fetchRequest).then(function(response) {
// Check if we received a valid response
if (!response || response.status !== 200 || response.type !== 'basic') {
return response;
}
// IMPORTANT: Clone the response. A response is a stream
// and because we want the browser to consume the response
// as well as the cache consuming the response, we need
// to clone it so we have two streams.
var responseToCache = response.clone();
caches.open(CACHE_NAME).then(function(cache) {
cache.put(event.request, responseToCache);
});
return response;
});
}));
});
self.addEventListener('activate', function(event) {
var cacheWhitelist = ['qrcode-cache-v1.2'];
event.waitUntil(caches.keys().then(function(cacheNames) {
return Promise.all(cacheNames.map(function(cacheName) {
if (cacheWhitelist.indexOf(cacheName) === -1) {
return caches.delete(cacheName);
}
}));
}));
});