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const CACHE_VERSION = "20251118a";
const STATIC_CACHE_NAME = `static-cache-${CACHE_VERSION}`;
const STATIC_CACHE_ASSETS = ["/favicon.ico", "/logo-256.png", "/logo-512.jpg"];
const EXPR_CACHE_AFTER_FIRST_VIEW =
/(\/assets\/.*)|(\/api\/(vigo|santiago)\/GetStopTimetable.*)/;
const ESTIMATES_MIN_AGE = 15 * 1000;
const ESTIMATES_MAX_AGE = 30 * 1000;
self.addEventListener("install", (event) => {
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) {
return cachedResponse;
}
try {
const netResponse = await fetch(request);
if (netResponse.ok) cache.put(request, netResponse.clone());
return netResponse;
} catch (err) {
return null;
}
}
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