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const CACHE_VERSION = "2025-1013a";
const STATIC_CACHE_NAME = `static-cache-${CACHE_VERSION}`;
const STATIC_CACHE_ASSETS = [
"/favicon.ico",
"/logo-256.png",
"/logo-512.jpg",
"/stops.json"
];
const EXPR_CACHE_AFTER_FIRST_VIEW = /(\/assets\/.*)|(\/api\/GetStopTimetable.*)/;
const ESTIMATES_MIN_AGE = 15 * 1000;
const ESTIMATES_MAX_AGE = 30 * 1000;
self.addEventListener("install", (event) => {
console.log("SW: Install event in progress. Cache version: ", CACHE_VERSION);
event.waitUntil(
caches.open(STATIC_CACHE_NAME).then((cache) =>
cache.addAll(STATIC_CACHE_ASSETS)
).then(() => self.skipWaiting())
);
});
self.addEventListener("activate", (event) => {
const doCleanup = async () => {
// Cleans the old caches
const cacheNames = await caches.keys();
await Promise.all(
cacheNames.map((name) => {
if (name !== STATIC_CACHE_NAME) {
return caches.delete(name);
}
})
);
await self.clients.claim();
}
event.waitUntil(doCleanup());
});
self.addEventListener("fetch", async (event) => {
const request = event.request;
const url = new URL(request.url);
// Ignore requests with unsupported schemes
if (!url.protocol.startsWith('http')) {
return;
}
// Navigating => we don't intercept anything, if it fails, good luck
if (request.mode === "navigate") {
return;
}
// Static => cache first, if not, network; if not, fallback
const isAssetCacheable = STATIC_CACHE_ASSETS.includes(url.pathname) || EXPR_CACHE_AFTER_FIRST_VIEW.test(url.pathname);
if (request.method === "GET" && isAssetCacheable) {
const response = handleStaticRequest(request);
if (response !== null) {
event.respondWith(response);
}
return;
}
});
async function handleStaticRequest(request) {
const cache = await caches.open(STATIC_CACHE_NAME);
const cachedResponse = await cache.match(request);
if (cachedResponse){
console.log("SW handleStaticRequest: HIT for ", request.url);
return cachedResponse;
}
try {
const netResponse = await fetch(request);
if (netResponse.ok) cache.put(request, netResponse.clone());
console.log("SW handleStaticRequest: MISS for ", request.url);
return netResponse;
} catch (err) {
console.error("SW handleStaticRequest: FAIL for ", request.url, err);
return null;
}
}
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