121 lines
4.5 KiB
Scheme
121 lines
4.5 KiB
Scheme
<%--<script>//Ugly fix for code highlights--%>
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var version = 'v1::';
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var debug = <% if $DebugMode %>true<% else %>false<% end_if %>;
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/**
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* Console.log proxy for quick enabling/disabling
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*/
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function log(msg){
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if(debug){
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console.log(msg);
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}
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}
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/**
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* Service worker installation
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*/
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self.addEventListener('install', function (event) {
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log('Service worker: install start');
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event.waitUntil(caches.open(version + 'fundamentals').then(function (cache) {
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//Install all required pages/assets
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return cache.addAll([
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'$BaseUrl'<% if $CacheOnInstall %>,<% end_if %>
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<% if $CacheOnInstall %>
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<% loop $CacheOnInstall %>
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'$Path'<% if not $Last %>,<% end_if %>
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<% end_loop %>
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<% end_if %>
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]);
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}).then(function () {
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log('Service worker: install completed');
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}).catch(function(){
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log('Service worker: install failed');
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}));
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});
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/**
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* Service worker activation
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*/
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self.addEventListener('activate', function (event) {
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log('Service worker: activate start');
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event.waitUntil(caches.keys().then(function (keys) {
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//Remove old cache entries
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return Promise.all(keys.filter(function (key) {
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return !key.startsWith(version);
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}).map(function (key) {
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return caches.delete(key);
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}));
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}).then(function () {
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log('Service worker: activate completed');
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}));
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});
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/**
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* Fetch handler
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*/
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self.addEventListener('fetch', function (event) {
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//We are only interested in get requests
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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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var requestURL = new URL(event.request.url);
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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('Service worker: 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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//Check for our own urls
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if (requestURL.origin == location.origin) {
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//All our own urls are following this route:
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//-If there is cache serve from cache but also update the cache from the network
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//-If there is no cache then get from the network and put in the cache
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//-If both fail fallback to a generic offline message
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event.respondWith(caches.match(event.request).then(function (cached) {
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var networked = fetch(event.request).then(fetchedFromNetwork, unableToResolve).catch(unableToResolve);
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log('Service worker: fetch event ' + (cached ? '(cached)' : '(network)') + ' - ' + event.request.url);
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return cached || networked;
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/**
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* Fetched from network handler
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*/
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function fetchedFromNetwork(response) {
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var cacheCopy = response.clone();
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log('Service worker fetch from network - ' + event.request.url);
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caches.open(version + 'pages').then(function add(cache) {
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cache.put(event.request, cacheCopy);
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}).then(function () {
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log('Service worker: fetch response stored in cache - ' + event.request.url);
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});
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return response;
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}
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/**
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* No internet and no cache handler
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*/
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function unableToResolve(error) {
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log('Service worker: fetch request failed in both cache and network ' + error);
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return new Response('<h1>Service Unavailable</h1>', {
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status: 503,
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statusText: 'Service Unavailable',
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headers: new Headers({
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'Content-Type': 'text/html'
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})
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});
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}
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}));
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return;
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}
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//All others, nothing special here
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log('Service worker: other url - ' + event.request.url);
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event.respondWith(caches.match(event.request).then(function(response) {
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return response || fetch(event.request);
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}));
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});
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//<%--Ugly fix for code highlights</script>--%> |