superuserdev.github.io/service-worker.js at master · superuserdev/superuserdev.github.io · GitHub

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// 2017-11-02 16:19
const base = location.pathname.split('/').reduce((url, path, i, arr) => {
	if (path.length !== 0 && i !== arr.length - 1) {
		url += `/${path}`;
	}
	return url;
},location.origin) + '/';

const config = {
	version: 'superuserdev.github.io',
	caches: [
		// Main assets
		'./',
		'./js/index.min.js',
		'./css/styles/index.min.css',
		'./img/icons.svg',
		'./img/favicon.svg',

		// Nav menu icons
		'./img/adwaita-icons/actions/document-open-recent.svg',
		'./img/adwaita-icons/actions/go-top.svg',
		'./img/adwaita-icons/actions/view-pin.svg',
		'./img/adwaita-icons/places/folder-publicshare.svg',

		// Logos
		'./img/logos/super-user.svg',
		'./img/logos/css3.svg',
		'./img/logos/PHP.svg',
		'./img/logos/svg.svg',
		'./img/logos/Facebook.svg',
		'./img/logos/twitter.svg',
		'./img/logos/linkedin.svg',
		'./img/logos/Google_plus.svg',
		'./img/logos/Reddit.svg',

		// Fonts
		'./fonts/acme.woff',
		'./fonts/Alice.woff',
		'./fonts/roboto.woff',
		'./fonts/ubuntu.woff2',
	].map(path => new URL(path, base)),
	ignored: [
		'./service-worker.js',
		'./manifest.json',
	].map(path => new URL(path, base)),
	paths: [
		'./js/',
		'./css/',
		'./img/',
		'./fonts/',
		'./posts/',
	].map(path => new URL(path, base)),
};

addEventListener('install', async () => {
	const cache = await caches.open(config.version);
	await cache.addAll(config.caches);
	skipWaiting();

});

addEventListener('activate', event => {
	event.waitUntil(async function() {
		clients.claim();
	}());
});

addEventListener('fetch', async event => {
	function isValid(req) {
		try {
			const url = new URL(req.url, base);
			const isGet = req.method === 'GET';
			const sameOrigin = url.origin === location.origin;
			const isHome = ['./', './index.html', './index.php']
				.map(path => new URL(path, base))
				.some(path => url.pathname === path);
			const notIgnored = config.ignored.every(path => url.pathname !== path);
			const allowedPath = config.paths.some(path => url.pathname.startsWith(path));

			return isGet && sameOrigin && (isHome || (allowedPath && notIgnored));
		} catch(err) {
			console.error(err);
			return false;
		}
	}

	async function get(request) {
		const cache = await caches.open(config.version);
		const cached = await cache.match(request);

		if (navigator.onLine) {
			const fetched = fetch(request).then(async resp => {
				if (resp instanceof Response) {
					const respClone = await resp.clone();
					await cache.put(event.request, respClone);
				}
				return resp;
			});

			if (cached instanceof Response) {
				return cached;
			} else {
				const resp = await fetched;
				return resp;
			}
		} else {
			return cached;
		}
	}

	if (isValid(event.request)) {
		event.respondWith(get(event.request));
	}
});