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const requests = new Set();
addEventListener('install', evt => {
evt.waitUntil(self.skipWaiting());
});
addEventListener('activate', evt => {
evt.waitUntil(self.clients.claim());
});
addEventListener('message', evt => {
evt.source.postMessage(requests);
});
addEventListener('fetch', evt => {
const url = new URL(evt.request.url);
const path = url.pathname;
const search = url.search || "?";
const params = new URLSearchParams(search);
const type = params.get('type');
if (path.includes('404')) {
const dir = path.split('/');
const request = dir[dir.length-1] + search;
if (!requests.has(request)) {
requests.add(request);
}
evt.respondWith(new Response("", {
headers: {
"Content-Type": type || "text/plain"
}
}));
} else if (path.endsWith('resources.html')) {
const html = params.get('html') || "";
evt.respondWith(new Response(html, {
headers: {
"Content-Type": type || "text/html"
}
}));
}
return;
});