basketrandom/sw.js

'use strict';
const OFFLINE_DATA_FILE = 'offline.json',
	CACHE_NAME_PREFIX = 'c3offline',
	BROADCASTCHANNEL_NAME = 'offline',
	CONSOLE_PREFIX = '[SW] ',
	LAZYLOAD_KEYNAME = '',
	broadcastChannel =
		'undefined' == typeof BroadcastChannel ? null : new BroadcastChannel('offline');
function PostBroadcastMessage(a) {
	broadcastChannel && setTimeout(() => broadcastChannel.postMessage(a), 3e3);
}
function Broadcast(a) {
	PostBroadcastMessage({ type: a });
}
function BroadcastDownloadingUpdate(a) {
	PostBroadcastMessage({ type: 'downloading-update', version: a });
}
function BroadcastUpdateReady(a) {
	PostBroadcastMessage({ type: 'update-ready', version: a });
}
function IsUrlInLazyLoadList(a, b) {
	if (!b) return !1;
	try {
		for (const c of b) if (new RegExp(c).test(a)) return !0;
	} catch (a) {
		console.error('[SW] Error matching in lazy-load list: ', a);
	}
	return !1;
}
function WriteLazyLoadListToStorage(a) {
	return 'undefined' == typeof localforage
		? Promise.resolve()
		: localforage.setItem(LAZYLOAD_KEYNAME, a);
}
function ReadLazyLoadListFromStorage() {
	return 'undefined' == typeof localforage
		? Promise.resolve([])
		: localforage.getItem(LAZYLOAD_KEYNAME);
}
function GetCacheBaseName() {
	return 'c3offline-' + self.registration.scope;
}
function GetCacheVersionName(a) {
	return GetCacheBaseName() + '-v' + a;
}
async function GetAvailableCacheNames() {
	const a = await caches.keys(),
		b = GetCacheBaseName();
	return a.filter((a) => a.startsWith(b));
}
async function IsUpdatePending() {
	const a = await GetAvailableCacheNames();
	return 2 <= a.length;
}
async function GetMainPageUrl() {
	const a = await clients.matchAll({ includeUncontrolled: !0, type: 'window' });
	for (const b of a) {
		let a = b.url;
		if (
			(a.startsWith(self.registration.scope) && (a = a.substring(self.registration.scope.length)),
			a && '/' !== a)
		)
			return a.startsWith('?') && (a = '/' + a), a;
	}
	return '';
}
function fetchWithBypass(a, b) {
	return (
		'string' == typeof a && (a = new Request(a)),
		b
			? fetch(a.url, {
					headers: a.headers,
					mode: a.mode,
					credentials: a.credentials,
					redirect: a.redirect,
					cache: 'no-store'
			  })
			: fetch(a)
	);
}
async function CreateCacheFromFileList(a, b, c) {
	const d = await Promise.all(b.map((a) => fetchWithBypass(a, c)));
	let e = !0;
	for (const f of d)
		f.ok ||
			((e = !1),
			console.error("[SW] Error fetching '" + f.url + "' (" + f.status + ' ' + f.statusText + ')'));
	if (!e) throw new Error('not all resources were fetched successfully');
	const f = await caches.open(a);
	try {
		return await Promise.all(d.map((a, c) => f.put(b[c], a)));
	} catch (b) {
		throw (console.error('[SW] Error writing cache entries: ', b), caches.delete(a), b);
	}
}
async function UpdateCheck(a) {
	try {
		const b = await fetchWithBypass(OFFLINE_DATA_FILE, !0);
		if (!b.ok) throw new Error('offline.json responded with ' + b.status + ' ' + b.statusText);
		const c = await b.json(),
			d = c.version,
			e = c.fileList,
			f = c.lazyLoad,
			g = GetCacheVersionName(d),
			h = await caches.has(g);
		if (h) {
			const a = await IsUpdatePending();
			return void (a
				? (console.log('[SW] Update pending'), Broadcast('update-pending'))
				: (console.log('[SW] Up to date'), Broadcast('up-to-date')));
		}
		const i = await GetMainPageUrl();
		e.unshift('./'),
			i && -1 === e.indexOf(i) && e.unshift(i),
			console.log('[SW] Caching ' + e.length + ' files for offline use'),
			a ? Broadcast('downloading') : BroadcastDownloadingUpdate(d),
			f && (await WriteLazyLoadListToStorage(f)),
			await CreateCacheFromFileList(g, e, !a);
		const j = await IsUpdatePending();
		j
			? (console.log('[SW] All resources saved, update ready'), BroadcastUpdateReady(d))
			: (console.log('[SW] All resources saved, offline support ready'),
			  Broadcast('offline-ready'));
	} catch (a) {
		console.warn('[SW] Update check failed: ', a);
	}
}
self.addEventListener('install', (a) => {
	a.waitUntil(UpdateCheck(!0).catch(() => null));
});
async function GetCacheNameToUse(a, b) {
	if (1 === a.length || !b) return a[0];
	const c = await clients.matchAll();
	if (1 < c.length) return a[0];
	const d = a[a.length - 1];
	return (
		console.log('[SW] Updating to new version'),
		await Promise.all(a.slice(0, -1).map((a) => caches.delete(a))),
		d
	);
}
async function HandleFetch(a, b) {
	const c = await GetAvailableCacheNames();
	if (!c.length) return fetch(a.request);
	const d = await GetCacheNameToUse(c, b),
		e = await caches.open(d),
		f = await e.match(a.request);
	if (f) return f;
	const g = await Promise.all([fetch(a.request), ReadLazyLoadListFromStorage()]),
		h = g[0],
		i = g[1];
	if (IsUrlInLazyLoadList(a.request.url, i))
		try {
			await e.put(a.request, h.clone());
		} catch (b) {
			console.warn("[SW] Error caching '" + a.request.url + "': ", b);
		}
	return h;
}
self.addEventListener('fetch', (a) => {
	if (new URL(a.request.url).origin === location.origin) {
		const b = 'navigate' === a.request.mode,
			c = HandleFetch(a, b);
		b && a.waitUntil(c.then(() => UpdateCheck(!1))), a.respondWith(c);
	}
});