// Served from / (not /static/) so its scope covers /admin/today/.
const CACHE = "osiris-v1";
self.addEventListener("install", (event) => {
self.skipWaiting();
});
self.addEventListener("activate", (event) => {
event.waitUntil(
caches
.keys()
.then((keys) =>
Promise.all(keys.filter((key) => key !== CACHE).map((key) => caches.delete(key)))
)
.then(() => self.clients.claim())
);
});
self.addEventListener("fetch", (event) => {
const { request } = event;
// Never touch writes or the API: a stale or replayed dose would be a lie.
if (request.method !== "GET" || new URL(request.url).pathname.startsWith("/api/")) {
return;
}
// Static assets change rarely: serve from cache, refresh in the background.
if (new URL(request.url).pathname.startsWith("/static/")) {
event.respondWith(
caches.open(CACHE).then(async (cache) => {
const cached = await cache.match(request);
const network = fetch(request)
.then((response) => {
if (response.ok) cache.put(request, response.clone());
return response;
})
.catch(() => cached);
return cached || network;
})
);
return;
}
// Pages: always prefer the live version, fall back to the last one seen so the
// app still opens (read-only) with no signal.
event.respondWith(
fetch(request)
.then((response) => {
if (response.ok) {
const copy = response.clone();
caches.open(CACHE).then((cache) => cache.put(request, copy));
}
return response;
})
.catch(async () => {
const cached = await caches.match(request);
return (
cached ||
new Response(
"" +
"" +
"Offline
Osiris needs a connection to load. Try again once you're back online.
",
{ headers: { "Content-Type": "text/html; charset=utf-8" } }
)
);
})
);
});