Use sw-precache to generate service worker

script/sw-precache.js

@@ -0,0 +1,52 @@
+/*
+Generate a caching service worker for HA
+
+Will be called as part of build_frontend.
+
+Expects home-assistant-polymer repo as submodule of HA repo.
+Creates a caching service worker based on the CURRENT content of HA repo.
+Output service worker to build/service_worker.js
+*/
+var crypto = require('crypto');
+var fs = require('fs');
+var path = require('path');
+var swPrecache = require('sw-precache');
+
+var rootDir = '..';
+
+function md5(filename) {
+  return crypto.createHash('md5')
+    .update(fs.readFileSync(filename)).digest('hex');
+}
+
+var appPaths = ['/', '/states', '/logbook', '/history', '/map',
+    '/devService', '/devState', '/devEvent', '/devInfo', '/devTemplate'];
+var fingerprinted = ['frontend', 'mdi'];
+
+var dynamicUrlToDependencies = {};
+
+appPaths.forEach(ap => {
+  dynamicUrlToDependencies[ap] = [rootDir + '/frontend.html'];
+});
+
+fingerprinted.forEach(fn => {
+  var hash = md5(rootDir + '/' + fn + '.html');
+  var url = '/static/' + fn + '-' + hash + '.html';
+  var fpath = rootDir + '/' + fn + '.html';
+  dynamicUrlToDependencies[url] = [fpath];
+});
+
+swPrecache.write(path.join('build', 'service_worker.js'), {
+  dynamicUrlToDependencies: dynamicUrlToDependencies,
+  staticFileGlobs: [
+    rootDir + '/favicon-192x192.png',
+    rootDir + '/webcomponents-lite.min.js',
+    rootDir + '/fonts/roboto/Roboto-Light.ttf',
+    rootDir + '/fonts/roboto/Roboto-Medium.ttf',
+    rootDir + '/fonts/roboto/Roboto-Regular.ttf',
+    rootDir + '/fonts/roboto/Roboto-Bold.ttf',
+    rootDir + '/images/card_media_player_bg.png',
+  ],
+  stripPrefix: '..',
+  replacePrefix: 'static',
+});