64 lines
1.8 KiB
JavaScript
64 lines
1.8 KiB
JavaScript
/* dsh-sync service worker: offline app shell + last-known API responses.
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* Served at /sw.js (scope /). Registration only happens in secure contexts;
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* plain-HTTP LAN deployments simply skip it and behave as before.
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*/
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"use strict";
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const SHELL_CACHE = "dsh-shell-v1";
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const API_CACHE = "dsh-api-v1";
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self.addEventListener("install", (e) => {
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e.waitUntil(
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caches.open(SHELL_CACHE)
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.then((c) => c.addAll(["/app"]))
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.then(() => self.skipWaiting())
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);
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});
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self.addEventListener("activate", (e) => {
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e.waitUntil((async () => {
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for (const k of await caches.keys()) {
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if (k !== SHELL_CACHE && k !== API_CACHE) await caches.delete(k);
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}
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await self.clients.claim();
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})());
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});
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self.addEventListener("fetch", (e) => {
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const req = e.request;
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if (req.method !== "GET") return;
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const url = new URL(req.url);
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if (url.origin !== self.location.origin) return;
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if (req.mode === "navigate") {
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// App shell: fresh when online, cached copy when the server is unreachable.
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e.respondWith((async () => {
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try {
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const resp = await fetch(req);
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if (resp.ok) (await caches.open(SHELL_CACHE)).put("/app", resp.clone());
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return resp;
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} catch {
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return (await caches.match("/app")) || Response.error();
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}
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})());
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return;
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}
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if (url.pathname.startsWith("/v1/")) {
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// API: network-first, fall back to the last successful response.
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e.respondWith((async () => {
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try {
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const resp = await fetch(req);
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if (resp.ok) (await caches.open(API_CACHE)).put(req, resp.clone());
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return resp;
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} catch {
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const hit = await caches.match(req);
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if (hit) return hit;
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return new Response(JSON.stringify({ detail: "offline" }), {
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status: 503,
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headers: { "Content-Type": "application/json" },
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});
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}
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})());
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}
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});
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