sw.js

var APP_PREFIX = 'CSunibo_';
var VERSION = 'version_01';
var CACHE_NAME = APP_PREFIX + VERSION
var URLS = [
  '/csunibo.github.io/',
  '/csunibo.github.io/index.html',
  '/csunibo.github.io/programmazione/',
  '/csunibo.github.io/architettura-degli-elaborati/',
  '/csunibo.github.io/logica-per-informatica/',
  '/csunibo.github.io/algebra-e-geometria/',
  '/csunibo.github.io/algoritmi-e-strutture-di-dati/',
  '/csunibo.github.io/analisi-matematica/',
  '/csunibo.github.io/calcolo-numerico/',
  '/csunibo.github.io/ottimizzazione-combinatoria/',
  '/csunibo.github.io/calcolo-delle-probabilita-e-statistica/',
  '/csunibo.github.io/tecnologie-web/',
  '/csunibo.github.io/linguaggi-di-programmazione/',
  '/csunibo.github.io/reti-di-calcolatori/',
  '/csunibo.github.io/sistemi-operativi/',
  '/csunibo.github.io/basi-di-dati/',
  '/csunibo.github.io/informatica-teorica/',
  '/csunibo.github.io/ingegneria-del-software/',
  '/csunibo.github.io/introduzione-apprendimento-automatico/',
  '/csunibo.github.io/fondamenti-di-cibersecurity/',
  '/csunibo.github.io/progetto-di-sistemi-virtuali/',
  '/csunibo.github.io/fisica/',
  '/csunibo.github.io/laboratorio-di-applicazioni-mobili/',
  '/csunibo.github.io/storia-informatica-e-dei-dispositivi-di-calcolo/',
  '/csunibo.github.io/strategie-aziendali/',
]

self.addEventListener('fetch', function(e) {
  console.log('fetch request : ' + e.request.url);
  e.respondWith(
    caches.match(e.request).then(function(request) {
      if (request) {
        console.log('responding with cache : ' + e.request.url);
        return request
      } else {
        console.log('file is not cached, fetching : ' + e.request.url);
        return fetch(e.request)
      }
    })
  )
})

self.addEventListener('install', function(e) {
  e.waitUntil(
    caches.open(CACHE_NAME).then(function(cache) {
      console.log('installing cache : ' + CACHE_NAME);
      return cache.addAll(URLS)
    })
  )
})

self.addEventListener('activate', function(e) {
  e.waitUntil(
    caches.keys().then(function(keyList) {
      var cacheWhitelist = keyList.filter(function(key) {
        return key.indexOf(APP_PREFIX)
      })
      cacheWhitelist.push(CACHE_NAME);
      return Promise.all(keyList.map(function(key, i) {
        if (cacheWhitelist.indexOf(key) === -1) {
          console.log('deleting cache : ' + keyList[i]);
          return caches.delete(keyList[i])
        }
      }))
    })
  )
})