Add files via upload

Author: turquoise-turtle

service-worker.js

@@ -0,0 +1,56 @@
+var CACHE = 'cache-and-update-zip';
+
+// On install, cache some resources.
+self.addEventListener('install', function(evt) {
+  console.log('The service worker is being installed.');
+
+  // Ask the service worker to keep installing until the returning promise
+  // resolves.
+  evt.waitUntil(precache());
+});
+
+// On fetch, use cache but update the entry with the latest contents
+// from the server.
+self.addEventListener('fetch', function(evt) {
+  console.log('The service worker is serving the asset.');
+  // You can use `respondWith()` to answer immediately, without waiting for the
+  // network response to reach the service worker...
+  evt.respondWith(fromCache(evt.request));
+  // ...and `waitUntil()` to prevent the worker from being killed until the
+  // cache is updated.
+  evt.waitUntil(update(evt.request));
+});
+
+// Open a cache and use `addAll()` with an array of assets to add all of them
+// to the cache. Return a promise resolving when all the assets are added.
+function precache() {
+  return caches.open(CACHE).then(function (cache) {
+    return cache.addAll([
+      'index.html',
+      'alt.js',
+      'jszip.js',
+      'filesaver.js'
+    ]);
+  });
+}
+
+// Open the cache where the assets were stored and search for the requested
+// resource. Notice that in case of no matching, the promise still resolves
+// but it does with `undefined` as value.
+function fromCache(request) {
+  return caches.open(CACHE).then(function (cache) {
+    return cache.match(request).then(function (matching) {
+      return matching || Promise.reject('no-match');
+    });
+  });
+}
+
+// Update consists in opening the cache, performing a network request and
+// storing the new response data.
+function update(request) {
+  return caches.open(CACHE).then(function (cache) {
+    return fetch(request).then(function (response) {
+      return cache.put(request, response);
+    });
+  });
+}