// 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("push", (event) => {
let payload = {};
try {
payload = event.data ? event.data.json() : {};
} catch (e) {
payload = { title: "Osiris", body: event.data ? event.data.text() : "" };
}
event.waitUntil(
self.registration.showNotification(payload.title || "Osiris", {
body: payload.body || "",
icon: "/static/icons/icon-192.png",
badge: "/static/icons/icon-192.png",
// Same tag replaces the previous notification instead of stacking.
tag: payload.tag || "osiris",
renotify: true,
requireInteraction: true, // A dose reminder should wait, not fade away.
data: { url: payload.url || "/admin/today/" },
})
);
});
self.addEventListener("notificationclick", (event) => {
event.notification.close();
const url = (event.notification.data && event.notification.data.url) || "/admin/today/";
// Focus the app if it is already open rather than opening a second window.
event.waitUntil(
self.clients
.matchAll({ type: "window", includeUncontrolled: true })
.then((windows) => {
for (const client of windows) {
if (client.url.includes(url) && "focus" in client) return client.focus();
}
return self.clients.openWindow(url);
})
);
});
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" } }
)
);
})
);
});