Falln87/godot_editor

1// This service worker is required to expose an exported Godot project as a2// Progressive Web App. It provides an offline fallback page telling the user3// that they need an Internet connection to run the project if desired.4// Incrementing CACHE_VERSION will kick off the install event and force5// previously cached resources to be updated from the network.6const CACHE_VERSION = "3.4.4.rc.custom_build";7const CACHE_NAME = "GodotEngine-cache";8const OFFLINE_URL = "offline.html";9// Files that will be cached on load.10const CACHED_FILES = ["godot.tools.html", "offline.html", "godot.tools.js", "godot.tools.worker.js", "godot.tools.audio.worklet.js", "logo.svg", "favicon.png"];11// Files that we might not want the user to preload, and will only be cached on first load.12const CACHABLE_FILES = ["godot.tools.wasm"];13const FULL_CACHE = CACHED_FILES.concat(CACHABLE_FILES);14 15self.addEventListener("install", (event) => {16	event.waitUntil(async function () {17		const cache = await caches.open(CACHE_NAME);18		// Clear old cache (including optionals).19		await Promise.all(FULL_CACHE.map(path => cache.delete(path)));20		// Insert new one.21		const done = await cache.addAll(CACHED_FILES);22		return done;23	}());24});25 26self.addEventListener("activate", (event) => {27	event.waitUntil(async function () {28		if ("navigationPreload" in self.registration) {29			await self.registration.navigationPreload.enable();30		}31	}());32	// Tell the active service worker to take control of the page immediately.33	self.clients.claim();34});35 36self.addEventListener("fetch", (event) => {37	const isNavigate = event.request.mode === "navigate";38	const url = event.request.url || "";39	const referrer = event.request.referrer || "";40	const base = referrer.slice(0, referrer.lastIndexOf("/") + 1);41	const local = url.startsWith(base) ? url.replace(base, "") : "";42	const isCachable = FULL_CACHE.some(v => v === local) || (base === referrer && base.endsWith(CACHED_FILES[0]));43	if (isNavigate || isCachable) {44		event.respondWith(async function () {45			try {46				// Use the preloaded response, if it's there47				let request = event.request.clone();48				let response = await event.preloadResponse;49				if (!response) {50					// Or, go over network.51					response = await fetch(event.request);52				}53				if (isCachable) {54					// Update the cache55					const cache = await caches.open(CACHE_NAME);56					cache.put(request, response.clone());57				}58				return response;59			} catch (error) {60				const cache = await caches.open(CACHE_NAME);61				if (event.request.mode === "navigate") {62					// Check if we have full cache.63					const cached = await Promise.all(FULL_CACHE.map(name => cache.match(name)));64					const missing = cached.some(v => v === undefined);65					const cachedResponse = missing ? await caches.match(OFFLINE_URL) : await caches.match(CACHED_FILES[0]);66					return cachedResponse;67				}68				const cachedResponse = await caches.match(event.request);69				return cachedResponse;70			}71		}());72	}73});74