https://ny1.com/serviceworker.js

1self.addEventListener('install', () => {
2    self.skipWaiting();
3});
4
5self.addEventListener('activate', event => {
6    event.waitUntil(self.clients.claim());
7});
8
9
10function postManifestMessage(clientId, request, response) {
11    // deliver the manifest to the client
12    self.clients.get(clientId).then(client => {
13        if (client) {
14            client.postMessage({
15                type: 'FETCH',
16                payload: {
17                    request,
18                    response,
19                },
20            });
21        } else {
22            console.warn('client not found clientId=' + clientId);
23        }
24    });
25}
26
27function postSegmentMessage(clientId, segmentUrl) {
28    self.clients.get(clientId).then(client => {
29        if (client) {
30            client.postMessage({
31                type: 'SEGMENT_URL',
32                payload: segmentUrl,
33            });
34        } else {
35            console.warn('client not found clientId=' + clientId);
36        }
37    });
38}
39
40self.addEventListener('fetch', (event) => {
41    // When the user opens the video app in multiple windows or tabs
42    // the same service worker is used by all. We must maintain
43    // seperate data for each of the clients.
44    // After page reload the clientId is not populated, but resultingClientId is
45    const clientId = event.clientId || event.resultingClientId;
46
47    // If it is an HLS manifest file. Our manifests have extension .m3u8, but spec says .m3u is acceptable as well.
48    if (event.request.url.match(/\.m3u/) !== null) {
49        event.respondWith(fetch(event.request.url).then(resp => resp.text().then(txt => {
50            // We need to change the protocol for the licence url for reasons shrouded in mystery
51            const updatedResp = txt.replaceAll('skds://', 'skd://');
52            const { headers, statusText, status } = resp;
53            const { url, method } = event.request;
54            // Manifests are needed for parsing of DAI metadata
55            postManifestMessage(clientId, { url, method }, updatedResp);
56
57            return new Response(updatedResp, { headers, status, statusText });
58        })));
59    } else if (event.request.url.match(/\.ts|\.m4s/) !== null) {
60        postSegmentMessage(clientId, event.request.url);
61    }
62});