KaiOS webapp for InfoFer scraper
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const VERSION = 'v27'
const API_ORIGIN = 'https://scraper.infotren.dcdev.ro/'
const API_TRAINS = `${API_ORIGIN}v3/trains`
const API_STATIONS = `${API_ORIGIN}v3/stations`
const API_ITINERARIES = `${API_ORIGIN}v3/itineraries`
const CACHE_FIRST = [
// Root
'/',
// Static assets
'/common/back.svg',
// Utility JS
'/common/worker.js',
'/common/items.js',
'/common/back.js',
'/common/tabs.js',
'/common/trainId.js',
// Base
'/base.css',
// Pages
'/index.html',
'/index.js',
'/about.html',
'/about.js',
'/train.html',
'/train.js',
'/view-train.html',
'/view-train.js',
'/view-train.css',
'/station.html',
'/station.js',
'/view-station.html',
'/view-station.js',
'/view-station.css',
'/route.html',
'/route.js',
'/route.css',
// API
API_TRAINS,
API_STATIONS,
API_ITINERARIES,
];
/**
* @param {string} url
* @returns {boolean}
*/
function shouldReturnFromCacheFirst(url) {
return CACHE_FIRST.map(u => u.includes('://') ? u : self.location.origin + u).includes(url.split('?')[0])
}
self.addEventListener('install', (event) => {
self.skipInstall()
event.waitUntil(
caches
.open(VERSION)
.then((cache) =>
cache.addAll(CACHE_FIRST)
)
)
})
const deleteCache = (/** @type {string} */ key) => caches.delete(key)
const deleteOldCaches = async () => {
const cacheKeepList = [VERSION]
const keyList = await caches.keys()
const cachesToDelete = keyList.filter((key) => !cacheKeepList.includes(key))
await Promise.all(cachesToDelete.map(deleteCache))
}
// Enable navigation preload
const enableNavigationPreload = async () => {
if (self.registration.navigationPreload) {
// Enable navigation preloads!
await self.registration.navigationPreload.enable()
}
}
self.addEventListener('activate', (event) => {
event.waitUntil(Promise.all([deleteOldCaches(), enableNavigationPreload()]))
})
self.addEventListener('message', (event) => {
if ('type' in event.data) {
switch (event.data.type) {
case 'swVersionRequest': {
event.source.postMessage({
type: 'swVersion',
version: VERSION,
})
break;
}
}
}
})
/**
* @param {RequestInfo | URL} request
* @param {Response} response
* @returns {Promise<void>}
*/
const putInCache = async (request, response) => {
const cache = await caches.open(VERSION)
// try {
// response.headers.set('SW-Cached-At', new Date().toISOString())
// }
// catch {
const headers = new Headers(response.headers)
headers.set('SW-Cached-At', new Date().toISOString())
response = new Response(response.body, {
status: response.status,
statusText: response.statusText,
headers,
})
// }
await cache.put(request, response)
}
const cacheFirst = async ({ request, preloadResponsePromise, refreshAnyway }) => {
// First try to get the resource from the cache
const responseFromCache = await caches.match(request)
if (responseFromCache) {
if (refreshAnyway || (responseFromCache.headers.has('SW-Cached-At') && Date.now() - new Date(responseFromCache.headers.get('SW-Cached-At')).valueOf() > 86400000)) {
console.log('[cf] using cache response; refreshing anyway but returning cache', responseFromCache);
((async () => {
try {
const response = await fetch(request)
if (response.ok) {
await putInCache(request, response)
}
}
catch {}
})())
}
else {
console.log('[cf] using cache response', responseFromCache)
}
return responseFromCache
}
// Next try to use (and cache) the preloaded response, if it's there
try {
if (preloadResponsePromise) {
const preloadResponse = await preloadResponsePromise
if (preloadResponse && preloadResponse.ok) {
console.info('[cf] using preload response', preloadResponse)
await putInCache(request, preloadResponse.clone())
return preloadResponse
}
else {
console.log('[cf] got not ok preloadResponse, ignoring', preloadResponse)
}
}
}
catch (e) {
// Ignore as preload isn't necessarily important
console.error('[cf] preload response error', e)
}
// Next try to get the resource from the network
const responseFromNetwork = await fetch(request)
// response may be used only once
// we need to save clone to put one copy in cache
// and serve second one
if (responseFromNetwork.ok) {
console.log('[cf] using network response; ok so also cache', responseFromNetwork)
await putInCache(request, responseFromNetwork.clone())
}
else {
console.log('[cf] using network not ok response', responseFromNetwork)
}
return responseFromNetwork;
}
const networkFirst = async ({ request, preloadResponsePromise }) => {
// First try to use (and cache) the preloaded response, if it's there
try {
if (preloadResponsePromise) {
const preloadResponse = await preloadResponsePromise
if (preloadResponse && preloadResponse.ok) {
console.info('[nf] using preload response', preloadResponse)
await putInCache(request, preloadResponse.clone())
return preloadResponse
}
else {
console.log('[nf] got not ok preloadResponse, ignoring', preloadResponse)
}
}
}
catch (e) {
// Ignore as preload isn't necessarily important
console.error('[nf] preload response error', e)
}
// Next try to get the resource from the network
let responseFromNetwork
let errorFromNetwork
try {
responseFromNetwork = await fetch(request)
}
catch (e) {
responseFromNetwork = null
errorFromNetwork = e
}
// If the response is ok, put it in cache and respond
if (responseFromNetwork && responseFromNetwork.ok) {
console.log('[nf] using ok network response', responseFromNetwork)
await putInCache(request, responseFromNetwork.clone())
return responseFromNetwork
}
// Response from network wasn't ok, try to find in cache
const responseFromCache = await caches.match(request)
if (responseFromCache) {
console.log('[nf] using cache response', responseFromCache)
return responseFromCache
}
// If we didn't find a cached response, return the fresh network error
if (responseFromNetwork) {
console.log('[nf] using network not ok response', responseFromNetwork)
return responseFromNetwork
}
else {
console.log('[nf] throwing network error', errorFromNetwork)
throw errorFromNetwork
}
}
self.addEventListener('fetch', (event) => {
if (shouldReturnFromCacheFirst(event.request.url)) {
event.respondWith(
cacheFirst({
request: event.request,
preloadResponsePromise: event.preloadResponse,
refreshAnyway: [API_STATIONS, API_TRAINS].includes(event.request.url.split('?')[0]),
})
)
}
else {
event.respondWith(
networkFirst({
request: event.request,
preloadResponsePromise: event.preloadResponse,
})
)
}
})