https://bristolpoliticsshow.github.io/sw.js

1// Minimal service worker: network-first so listeners always get fresh shows,
2// with a cached copy as an offline fallback. Bump CACHE_VERSION to force refresh.
3const CACHE_VERSION = "bps-v2";
4
5self.addEventListener("install", (event) => {
6  self.skipWaiting();
7});
8
9self.addEventListener("activate", (event) => {
10  event.waitUntil(
11    caches.keys().then((keys) =>
12      Promise.all(keys.filter((k) => k !== CACHE_VERSION).map((k) => caches.delete(k)))
13    ).then(() => self.clients.claim())
14  );
15});
16
17self.addEventListener("fetch", (event) => {
18  const req = event.request;
19
20  // Only handle same-origin GETs. Never touch audio streams or cross-origin media.
21  if (req.method !== "GET" || new URL(req.url).origin !== self.location.origin) {
22    return;
23  }
24  if (req.destination === "audio") {
25    return;
26  }
27
28  // Pages and JSON data should always revalidate against the server so edits
29  // show up promptly (GitHub Pages otherwise lets browsers cache HTML ~10 min).
30  const revalidate =
31    req.mode === "navigate" ||
32    req.destination === "document" ||
33    /\.json(\?|$)/.test(req.url);
34
35  event.respondWith(
36    fetch(revalidate ? new Request(req.url, { cache: "no-cache" }) : req)
37      .then((resp) => {
38        if (resp && resp.ok) {
39          const copy = resp.clone();
40          caches.open(CACHE_VERSION).then((cache) => cache.put(req, copy));
41        }
42        return resp;
43      })
44      .catch(() => caches.match(req))
45  );
46});