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service-worker.js
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service-worker.js
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self.addEventListener("install", function (event) {
event.waitUntil(preLoad());
});
var preLoad = function () {
// console.log('Install Event processing');
return caches.open("offline").then(function (cache) {
// console.log('Cached index and offline page during Install');
return cache.addAll(["offline.html", "index.html"]);
});
};
self.addEventListener("fetch", function (event) {
// console.log(`The service worker is serving the asset: ${event.request.url}`);
if (!event.request.url) {
return Promise.resolve();
}
event.respondWith(
checkResponse(event.request).catch(function () {
return returnFromCache(event.request);
})
);
event.waitUntil(addToCache(event.request));
});
var checkResponse = function (request) {
return new Promise(function (fulfill, reject) {
fetch(request).then(function (response) {
if (response.status !== 404 || response.type === "opaque") {
fulfill(response);
} else {
reject();
}
}, reject);
});
};
var addToCache = function (request) {
if (
request.url.startsWith("chrome-extension://") ||
request.url.indexOf("api.spotify.com") >= 0 ||
request.url.indexOf("api.deezer.com") >= 0 ||
(request.cache === "only-if-cached" && request.mode !== "same-origin")
) {
// console.log("ignoring extension: " + request.url)
return Promise.resolve();
}
return caches.open("offline").then(function (cache) {
return fetch(request).then(function (response) {
// console.log('add page to offline ' + request.url)
return cache.put(request, response);
});
});
};
var returnFromCache = function (request) {
return caches.open("offline").then(function (cache) {
return cache.match(request).then(function (matching) {
if (!matching || matching.status == 404) {
return cache.match("offline.html");
} else {
return matching;
}
});
});
};