added PWA manifest and basic service worker

Author: fquirin

www/index.html

@@ -48,6 +48,9 @@
 	<meta property="og:locale" content="en_GB"/>
 	<meta property="og:locale:alternate" content="en_US"/>
 	<meta property="og:locale:alternate" content="de_DE"/>
+
+	<!-- PWA manifest -->
+	<link rel="manifest" href="sepia.webmanifest">
 
 	<!-- imports -->
 	<!--<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">-->
@@ -665,6 +668,16 @@ <h2><i class="material-icons md-txt">people</i>&nbsp;<script>SepiaFW.local.w('ac
 			'%3Cscript src="js/index.js"%3E%3C/script%3E'
 		));
 	}else{
+		//register service worker in non-Cordova app only for now
+		if('serviceWorker' in navigator){
+			navigator.serviceWorker
+				.register('sw.js')
+				.then(function(){ 
+					SepiaFW.debug.log('Service Worker: Registered');
+				});
+		};
+
+		//call setup
 		appSetup();
 	}
 </script>

www/sepia.webmanifest

@@ -0,0 +1,40 @@
+{
+    "name": "S.E.P.I.A. Open Assistant",
+    "short_name": "S.E.P.I.A.",
+    "description": "S.E.P.I.A. is an app and framework for your own server-based, extendable, private, intelligent assistant.",
+    "icons": [
+        {
+            "src": "./img/icon.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        }, {
+            "src": "./img/icon-512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        }
+    ],
+    "start_url": "./index.html?pwa=true",
+    "display": "standalone",
+    "theme_color": "#000000",
+    "background_color": "#000000",
+	"shortcuts": [
+		{
+			"name": "Always-ON Avatar",
+			"short_name": "Always-ON",
+			"description": "Start SEPIA in always-ON avatar mode.",
+			"url": "./index.html?pwa=true&view=aomode",
+			"icons": [{ "src": "./img/icon.png", "sizes": "192x192" }]
+		}, {
+			"name": "Teach Interface",
+			"short_name": "Teach-UI",
+			"description": "Teach SEPIA a new command.",
+			"url": "./index.html?pwa=true&view=teachui",
+			"icons": [{ "src": "./img/icon.png", "sizes": "192x192" }]
+		}
+	],
+	"related_applications": [{
+		"platform": "play",
+		"url": "https://play.google.com/store/apps/details?id=de.bytemind.sepia.app.web"
+	}],
+	"prefer_related_applications": true
+}

www/sw.js

@@ -0,0 +1,32 @@
+var cacheName = 'SEPIA_PWA_v0.23.0_b001'; 		//TODO: remember to clear old caches when the versioned SW cache is active
+self.addEventListener('install', function(event){
+	event.waitUntil(
+		caches.open(cacheName).then(function(cache){
+			//Nothing to install yet
+			return cache.addAll([]);
+		})
+	);
+});
+
+//Network-Only Mode - see: https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook#network-only
+self.addEventListener('fetch', function(event){
+	event.respondWith(caches.match(event.request).then(function(response){
+		//is in SW cache?
+		if (response !== undefined){
+			return response;
+		//get it the usual way (this includes default browser HTTP-cache I guess)
+		}else{
+			return fetch(event.request);
+			/*
+			//put copy in cache
+			return fetch(event.request).then(function(response){
+				return caches.open(cacheName).then(function(cache){
+					console.log('[Service Worker] Caching new resource: ' + event.request.url);
+					cache.put(event.request, response.clone());
+					return response;
+				});
+			});
+			*/
+		}
+	}));
+});