update sw.js

sw.js

@@ -1,19 +1,52 @@
-self.addEventListener('install', (e) => {
-    e.waitUntil(
-      caches.open('iDSandbox4All').then((cache) => cache.addAll([
-        '/id_sandbox_for_all/',
-        '/id_sandbox_for_all/index.html',
-        '/id_sandbox_for_all/land.html',
-        '/id_sandbox_for_all/icon/icon.png',
-        '/id_sandbox_for_all/dist/iD.js',
-        '/id_sandbox_for_all/dist/iD.css',
-      ])),
-    );
-  });
-
-  self.addEventListener('fetch', (e) => {
-    console.log(e.request.url);
-    e.respondWith(
-      caches.match(e.request).then((response) => response || fetch(e.request)),
-    );
-  });
+var GHPATH = '/github-page-pwa';
+var APP_PREFIX = 'gppwa_';
+var VERSION = 'version_002';
+var URLS = [    
+  `${GHPATH}/`,
+  `${GHPATH}/index.html`,
+  `${GHPATH}/css/styles.css`,
+  `${GHPATH}/img/icon.png`,
+  `${GHPATH}/js/app.js`
+]
+
+var CACHE_NAME = APP_PREFIX + VERSION
+self.addEventListener('fetch', function (e) {
+  console.log('Fetch request : ' + e.request.url);
+  e.respondWith(
+    caches.match(e.request).then(function (request) {
+      if (request) { 
+        console.log('Responding with cache : ' + e.request.url);
+        return request
+      } else {       
+        console.log('File is not cached, fetching : ' + e.request.url);
+        return fetch(e.request)
+      }
+    })
+  )
+})
+
+self.addEventListener('install', function (e) {
+  e.waitUntil(
+    caches.open(CACHE_NAME).then(function (cache) {
+      console.log('Installing cache : ' + CACHE_NAME);
+      return cache.addAll(URLS)
+    })
+  )
+})
+
+self.addEventListener('activate', function (e) {
+  e.waitUntil(
+    caches.keys().then(function (keyList) {
+      var cacheWhitelist = keyList.filter(function (key) {
+        return key.indexOf(APP_PREFIX)
+      })
+      cacheWhitelist.push(CACHE_NAME);
+      return Promise.all(keyList.map(function (key, i) {
+        if (cacheWhitelist.indexOf(key) === -1) {
+          console.log('Deleting cache : ' + keyList[i] );
+          return caches.delete(keyList[i])
+        }
+      }))
+    })
+  )
+})