103 lines
4.0 KiB
JavaScript
103 lines
4.0 KiB
JavaScript
// cdrop service worker — makes the web app installable and caches hashed static
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// assets for faster repeat loads.
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//
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// Deliberately minimal. It does NOT intercept:
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// - /api/* — SSE (/api/hub/events), clipboard, signaling, relay need a
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// live, unbuffered connection; and the OAuth exchange/refresh
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// must not be cached.
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// - navigations — page loads / OAuth redirects go straight to the network.
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// (A SW that mediates navigations was stalling the Casdoor →
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// app redirect for ~2 min in Safari; cdrop is useless offline
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// anyway, so there's nothing to gain by caching the shell.)
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// - cross-origin — fonts / CDN are left to the browser.
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//
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// What's left: hashed JS/CSS/image assets, served stale-while-revalidate.
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const CACHE = "cdrop-assets-v2";
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self.addEventListener("install", (event) =>
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{
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// No precache — assets are cached lazily on first fetch. Activate immediately.
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event.waitUntil(self.skipWaiting());
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});
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self.addEventListener("activate", (event) =>
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{
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event.waitUntil(
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caches.keys()
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.then((keys) => Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k))))
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.then(() => self.clients.claim()),
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);
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});
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self.addEventListener("fetch", (event) =>
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{
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const req = event.request;
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if (req.method !== "GET") { return; }
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if (req.mode === "navigate") { return; } // page loads / OAuth redirects → network
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const url = new URL(req.url);
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if (url.origin !== self.location.origin) { return; } // cross-origin (fonts/CDN) → browser default
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if (url.pathname.startsWith("/api/")) { return; } // live backend → never intercept
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// Static assets (Vite emits content-hashed, immutable files): serve cache
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// immediately, refresh in the background.
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event.respondWith(
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caches.match(req).then((cached) =>
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{
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const network = fetch(req)
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.then((resp) =>
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{
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if (resp && resp.status === 200 && resp.type === "basic")
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{
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const copy = resp.clone();
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caches.open(CACHE).then((c) => c.put(req, copy)).catch(() => {});
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}
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return resp;
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})
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.catch(() => cached);
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return cached || network;
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}),
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);
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});
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// ---- Web Push --------------------------------------------------------------
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// Fires only when this device's page is closed (an open page got the event over
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// SSE and showed an in-app toast instead). The payload is the JSON the server's
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// push.Sender already localized: { type, title, body, tag, url }. The SW just
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// displays it — no /api access, no app logic.
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self.addEventListener("push", (event) =>
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{
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let data = {};
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try { data = event.data ? event.data.json() : {}; }
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catch (_e) { data = {}; }
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const title = data.title || "Commilitia Drop";
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const options = {
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body: data.body || "",
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tag: data.tag || undefined, // same tag replaces a stale notification in place
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icon: "/icon-192.png",
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badge: "/icon-192.png",
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data: { url: data.url || "/" },
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};
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event.waitUntil(self.registration.showNotification(title, options));
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});
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// Clicking a notification focuses an existing window if one is open, else opens
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// the app at the notification's target URL.
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self.addEventListener("notificationclick", (event) =>
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{
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event.notification.close();
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const target = (event.notification.data && event.notification.data.url) || "/";
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event.waitUntil(
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self.clients.matchAll({ type: "window", includeUncontrolled: true }).then((clients) =>
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{
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for (const c of clients)
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{
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if ("focus" in c) { return c.focus(); }
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}
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return self.clients.openWindow ? self.clients.openWindow(target) : undefined;
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}),
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);
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});
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