Restructure service worker stuff

script/gen-service-worker.js

@@ -0,0 +1,94 @@
+#! /usr/bin/env node
+
+/*
+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 uglifyJS = require('uglify-js');
+
+const DEV = !!JSON.parse(process.env.BUILD_DEV || 'true');
+
+var rootDir = '..';
+var panelDir = rootDir + '/panels';
+
+var dynamicUrlToDependencies = {
+  '/': [rootDir + '/frontend.html', rootDir + '/core.js'],
+};
+
+var staticFingerprinted = [
+  'frontend.html',
+  'mdi.html',
+  'core.js',
+];
+
+// The panels that will always be loaded
+var panelsFingerprinted = [
+  'map', 'dev-event', 'dev-info', 'dev-service', 'dev-state', 'dev-template',
+];
+
+function md5(filename) {
+  return crypto.createHash('md5')
+    .update(fs.readFileSync(filename)).digest('hex');
+}
+
+// Create fingerprinted versions of our dependencies.
+staticFingerprinted.forEach(fn => {
+  var parts = path.parse(fn);
+  var hash = md5(rootDir + '/' + parts.name + parts.ext);
+  var url = '/static/' + parts.name + '-' + hash + parts.ext;
+  var fpath = rootDir + '/' + parts.name + parts.ext;
+  dynamicUrlToDependencies[url] = [fpath];
+});
+
+panelsFingerprinted.forEach(panel => {
+  var fpath = panelDir + '/ha-panel-' + panel + '.html';
+  var hash = md5(fpath);
+  var url = '/frontend/panels/' + panel + '-' + hash + '.html';
+  dynamicUrlToDependencies[url] = [fpath];
+});
+
+var options = {
+  navigateFallback: '/',
+  navigateFallbackWhitelist: [/^((?!(static|api|local|service_worker.js|manifest.json)).)*$/],
+  dynamicUrlToDependencies: dynamicUrlToDependencies,
+  staticFileGlobs: [
+    rootDir + '/icons/favicon.ico',
+    rootDir + '/icons/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',
+  verbose: true,
+};
+
+var devBase = 'console.warn("Service worker caching disabled in development")';
+
+var swHass = fs.readFileSync(path.resolve(__dirname, 'service-worker.js.tmpl'), 'UTF-8')
+
+var genPromise = DEV ? Promise.resolve(devBase) : swPrecache.generate(options);
+
+genPromise = genPromise.then(swString => swString + '\n' + swHass);
+
+if (!DEV) {
+  genPromise = genPromise.then(
+    swString => uglifyJS.minify(swString, { fromString: true }).code);
+}
+
+genPromise.then(
+  swString =>
+    fs.writeFileSync(path.resolve(__dirname, '../build/service_worker.js'), swString)
+).catch(err => console.error(err));