SecureNotes/public/serviceworker.js

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function log(...params) {
console.log.apply(this, [...["%c[SW]: %c", "color: #f4b942;", "color:unset;"], ...params])
}
const CACHE = "offline";
let precacheFiles = [
"/",
"/main.js",
"/main.css",
"/serviceworker.js"
]
//Install stage sets up the cache-array to configure pre-cache content
self.addEventListener('install', (evt) => {
log('The service worker is being installed.');
evt.waitUntil(precache().then(() => {
log('Skip waiting on install');
}).catch(log).then(() => self.skipWaiting()));
});
//allow sw to control of current page
self.addEventListener('activate', (event) => {
log('Claiming clients for current page');
return self.clients.claim();
});
self.addEventListener('message', (event) => {
if (event.data === "clear_cache") {
log("Clearing cache");
caches.delete(CACHE);
}
if (event.data === "update_index") {
log("Updating index");
event.waitUntil(caches.open(CACHE).then((cache) => {
return cache.addAll(["/", "/index.html"]).then(() => {
event.ports[0].postMessage("reload");
});
}))
}
});
var Types;
(function (Types) {
Types[Types["CACHE"] = 0] = "CACHE";
Types[Types["NOCACHE"] = 1] = "NOCACHE";
Types[Types["REFRESH"] = 2] = "REFRESH";
})(Types || (Types = {}));
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let rules = [{
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match: (url) => {
return url.indexOf("/api/") >= 0;
},
type: Types.NOCACHE
},
{
match: () => {
return true;
},
type: Types.REFRESH
}
]
self.addEventListener('fetch', (evt) => {
if (evt.request.method != 'GET') return; // Dont care about POST requests
let rule = rules.find(rule => rule.match(evt.request.url));
evt.respondWith((async () => {
log("Cache:", Types[rule.type]);
switch (rule.type) {
case Types.CACHE:
return fromCache(evt.request);
case Types.REFRESH:
return refresh(evt.request).then(r => {
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evt.waitUntil(r.refresh.catch(_ => {}));
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return r.result;
});
case Types.NOCACHE:
return fetch(evt.request);
}
})());
});
async function fromCache(request) {
let cache = await caches.open(CACHE);
let matching = await cache.match(request);
if (matching)
return matching
let res = await fetch(request.clone());
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await cache.put(request, {
match: (url) => {
return url.indexOf("/version_hash") >= 0;
},
type: Types.NOCACHE
}, res);
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return await cache.match(request);
}
async function refresh(request) {
let cache = await caches.open(CACHE);
let web = fetch(request.clone()).then(res => {
return cache.put(request, res).then(() => {
return cache.match(request);
})
})
let matching = await cache.match(request);
return {
result: matching ? matching : web,
refresh: web
}
}
function precache() {
return caches.open(CACHE).then(function (cache) {
return cache.addAll(precacheFiles);
});
}