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sw.js
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sw.js
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// configuration
`use strict`
const version = '1.0.1'
const CACHE = version + '::PWAsite'
const installFilesEssential = [
'/'
]
// install static assets
function installStaticFiles() {
return caches.open(CACHE)
.then(cache => {
// cache essential files
return cache.addAll(installFilesEssential)
})
}
// clear old caches
function clearOldCaches() {
return caches.keys().then(keylist => {
return Promise.all(
keylist
.filter(key => key !== CACHE)
.map(key => caches.delete(key))
)
})
}
// application installation
self.addEventListener('install', event => {
console.log('service worker: install')
// cache core files
event.waitUntil(
installStaticFiles().then(() => self.skipWaiting()).catch(() => {
console.error('service worker:cannot install')
})
)
})
// application activated
self.addEventListener('activate', event => {
console.log('service worker: activate')
// delete old caches
event.waitUntil(
clearOldCaches()
.then(() => self.clients.claim())
)
})
// is image URL?
function isImage(url) {
const iExt = ['.png', '.jpg', '.jpeg', '.gif', '.webp', '.bmp']
return iExt.reduce((ret, ext) => ret || url.endsWith(ext), false)
}
// return offline asset
function offlineAsset(url) {
if (isImage(url)) {
// return image
return new Response(
'<svg role="img" viewBox="0 0 400 300" xmlns="http://www.w3.org/2000/svg"><title>offline</title><path d="M0 0h400v300H0z" fill="#eee" /><text x="200" y="150" text-anchor="middle" dominant-baseline="middle" font-family="sans-serif" font-size="50" fill="#ccc">offline</text></svg>',
{ headers: {
'Content-Type': 'image/svg+xml',
'Cache-Control': 'no-store'
}}
)
} else {
// return page
return `<html><body>disconnect to the server</body></html>`
}
}
// application fetch network data
self.addEventListener('fetch', event => {
// abandon non-GET requests
if (event.request.method !== 'GET') {
return
}
const url = event.request.url
event.respondWith(
caches.open(CACHE)
.then(cache => {
return cache.match(event.request)
.then(response => {
if (response) {
// return cached file
console.log('cache fetch: ' + url)
return response
}
// make network request
return fetch(event.request)
.then(newreq => {
console.log('network fetch: ' + url)
if (newreq.ok) {
cache.put(event.request, newreq.clone())
}
return newreq
})
// app is offline
.catch(() => offlineAsset(url))
})
})
)
})