106 lines
3.8 KiB
JavaScript
106 lines
3.8 KiB
JavaScript
// This service worker is required to expose an exported Godot project as a
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// Progressive Web App. It provides an offline fallback page telling the user
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// that they need an Internet connection to run the project if desired.
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// Incrementing CACHE_VERSION will kick off the install event and force
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// previously cached resources to be updated from the network.
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const CACHE_VERSION = "___GODOT_VERSION___";
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const CACHE_PREFIX = "___GODOT_NAME___-sw-cache-";
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const CACHE_NAME = CACHE_PREFIX + CACHE_VERSION;
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const OFFLINE_URL = "___GODOT_OFFLINE_PAGE___";
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// Files that will be cached on load.
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const CACHED_FILES = ___GODOT_CACHE___;
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// Files that we might not want the user to preload, and will only be cached on first load.
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const CACHABLE_FILES = ___GODOT_OPT_CACHE___;
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const FULL_CACHE = CACHED_FILES.concat(CACHABLE_FILES);
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self.addEventListener("install", (event) => {
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event.waitUntil(caches.open(CACHE_NAME).then(cache => cache.addAll(CACHED_FILES)));
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});
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self.addEventListener("activate", (event) => {
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event.waitUntil(caches.keys().then(
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function (keys) {
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// Remove old caches.
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return Promise.all(keys.filter(key => key.startsWith(CACHE_PREFIX) && key != CACHE_NAME).map(key => caches.delete(key)));
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}).then(function () {
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// Enable navigation preload if available.
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return ("navigationPreload" in self.registration) ? self.registration.navigationPreload.enable() : Promise.resolve();
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})
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);
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});
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async function fetchAndCache(event, cache, isCachable) {
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// Use the preloaded response, if it's there
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let response = await event.preloadResponse;
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if (!response) {
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// Or, go over network.
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response = await self.fetch(event.request);
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}
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if (isCachable) {
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// And update the cache
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cache.put(event.request, response.clone());
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}
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return response;
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}
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self.addEventListener("fetch", (event) => {
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const isNavigate = event.request.mode === "navigate";
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const url = event.request.url || "";
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const referrer = event.request.referrer || "";
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const base = referrer.slice(0, referrer.lastIndexOf("/") + 1);
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const local = url.startsWith(base) ? url.replace(base, "") : "";
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const isCachable = FULL_CACHE.some(v => v === local) || (base === referrer && base.endsWith(CACHED_FILES[0]));
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if (isNavigate || isCachable) {
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event.respondWith(async function () {
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// Try to use cache first
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const cache = await caches.open(CACHE_NAME);
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if (event.request.mode === "navigate") {
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// Check if we have full cache during HTML page request.
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const fullCache = await Promise.all(FULL_CACHE.map(name => cache.match(name)));
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const missing = fullCache.some(v => v === undefined);
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if (missing) {
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try {
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// Try network if some cached file is missing (so we can display offline page in case).
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return await fetchAndCache(event, cache, isCachable);
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} catch (e) {
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// And return the hopefully always cached offline page in case of network failure.
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console.error("Network error: ", e);
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return await caches.match(OFFLINE_URL);
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}
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}
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}
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const cached = await cache.match(event.request);
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if (cached) {
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return cached;
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} else {
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// Try network if don't have it in cache.
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return await fetchAndCache(event, cache, isCachable);
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}
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}());
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}
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});
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self.addEventListener("message", (event) => {
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// No cross origin
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if (event.origin != self.origin) {
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return;
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}
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const id = event.source.id || "";
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const msg = event.data || "";
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// Ensure it's one of our clients.
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self.clients.get(id).then(function (client) {
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if (!client) {
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return; // Not a valid client.
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}
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if (msg === "claim") {
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self.skipWaiting().then(() => self.clients.claim());
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} else if (msg === "clear") {
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caches.delete(CACHE_NAME);
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} else if (msg === "update") {
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self.skipWaiting().then(() => self.clients.claim()).then(() => self.clients.matchAll()).then(all => all.forEach(c => c.navigate(c.url)));
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} else {
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onClientMessage(event);
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}
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});
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});
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