2018-06-27 12:47:46 +00:00
|
|
|
// configuration
|
|
|
|
|
`use strict`
|
|
|
|
|
|
|
|
|
|
const version = '2.0.0'
|
|
|
|
|
const CACHE = version + '::PWAsite'
|
2018-06-27 14:01:14 +00:00
|
|
|
const installFilesEssential = [
|
2018-06-27 15:22:45 +00:00
|
|
|
'/'
|
2018-06-27 15:08:23 +00:00
|
|
|
]
|
2018-06-27 14:01:14 +00:00
|
|
|
// const installFilesEssential = [
|
|
|
|
|
// '/',
|
|
|
|
|
// './static/tinymce4.7.5/*',
|
|
|
|
|
// './manifest.json',
|
|
|
|
|
// './build/logo.png'
|
|
|
|
|
// ].concat(offlineURL)
|
2018-06-27 12:47:46 +00:00
|
|
|
|
|
|
|
|
// 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?
|
|
|
|
|
const iExt = ['.png', '.jpg', '.jpeg', '.gif', '.webp', '.bmp']
|
|
|
|
|
function isImage(url) {
|
|
|
|
|
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))
|
|
|
|
|
})
|
|
|
|
|
})
|
|
|
|
|
|
|
|
|
|
)
|
|
|
|
|
})
|
