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sw.js
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sw.js
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var cacheVersion = 1,
cacheName = 'backhome.cache.v' + cacheVersion,
staticUrl = '/static/',
cacheList = [
staticUrl + 'favicon.png',
staticUrl + 'img/backhome192.png',
staticUrl + 'img/backhome256.png',
staticUrl + 'img/backhome384.png',
staticUrl + 'img/backhome512.png',
staticUrl + 'manifest.json',
'https://fonts.googleapis.com/icon?family=Material+Icons',
staticUrl + 'js/main.js',
staticUrl + 'js/app.js'
]
lastRequest = null,
handlePostResponse = function(req)
{
if(navigator.onLine)
{
return fetch(req);
}
lastRequest = req;
return new Response(null, { status : 200 }).clone();
}
;
self.addEventListener('install', function(event)
{
event.waitUntil(
caches.open(cacheName)
.then(function(cache)
{
// console.log('Cache all');
return cache.addAll(cacheList);
})
);
});
self.addEventListener('activate', function(event) {
// Active worker won't be treated as activated until promise resolves successfully.
event.waitUntil(
caches.keys()
.then(function(cacheKeys)
{
return Promise.all(
cacheKeys.map(function(cacheKey)
{
if (cacheKey !== cacheName)
{
console.log('Deleting out of date cache:', cacheKey);
return caches.delete(cacheKey);
}
})
);
})
);
});
self.addEventListener('fetch', function(event)
{
console.log('Handling fetch event for', event.request.url);
if(/^(?:http|https):\/\/.+:3000\/saveMusic$/.test(event.request.url) && event.request.method === 'POST')
{
return handlePostResponse(event.request);
}
event.respondWith(
caches.open(cacheName)
.then(function(cache)
{
return cache.match(event.request)
.then(function(response)
{
if(response)
{
// console.log('Found response in cache:', response);
return response;
}
return fetch(event.request)
.then(function(response)
{
// response may be used only once
// we need to save clone to put one copy in cache
// and serve second one
let responseClone = response.clone();
caches.open(cacheName)
.then(function(cache)
{
console.log('Put in cache:', response);
cache.put(event.request, responseClone);
});
return response;
})
.catch(function(error)
{
// Handles exceptions that arise from match() or fetch().
console.error('Error in fetch handler:', error);
});
})
})
);
});
self.addEventListener('message', function(message)
{
if(message.data.type === 'network' && message.data.status === true && lastRequest !== null)
{
return fetch(lastRequest)
.then((response) =>
{
return caches.open(cacheName)
.then(function(cache)
{
return cache.delete('/')
.then(() =>
{
lastRequest = null;
return response;
});
});
});
}
});