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// pack:ignore
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const RELOADS = new Map<string, Promise<Response>>()
const ETAGS = new Map<string, string>()
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const CACHEREFRESH = new Map<string, Promise<void>>()
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const EXCLUDECACHE = new Set<string>([
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// API requests
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"/api/",
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// PayPal stuff
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"/paypal/",
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// List imports
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"/import/",
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// Infinite scrolling
"/from/",
// Chrome extension
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"chrome-extension",
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// Authorization paths /auth/ and /logout are not listed here because they are handled in a special way.
])
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class MyCache {
version: string
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constructor(version: string) {
this.version = version
}
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store(request: RequestInfo, response: Response) {
return caches.open(this.version).then(cache => {
return cache.put(request, response)
})
}
}
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class MyServiceWorker {
cache: MyCache
currentCSP: string
constructor() {
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this.cache = new MyCache("v-4")
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this.currentCSP = ""
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self.addEventListener("install", (evt: InstallEvent) => evt.waitUntil(this.onInstall(evt)))
self.addEventListener("activate", (evt: any) => evt.waitUntil(this.onActivate(evt)))
self.addEventListener("fetch", (evt: FetchEvent) => evt.waitUntil(this.onRequest(evt)))
self.addEventListener("message", (evt: any) => evt.waitUntil(this.onMessage(evt)))
self.addEventListener("push", (evt: PushEvent) => evt.waitUntil(this.onPush(evt)))
self.addEventListener("pushsubscriptionchange", (evt: any) => evt.waitUntil(this.onPushSubscriptionChange(evt)))
self.addEventListener("notificationclick", (evt: NotificationEvent) => evt.waitUntil(this.onNotificationClick(evt)))
}
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onInstall(evt: InstallEvent) {
console.log("service worker install")
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return (self as any).skipWaiting().then(() => {
return this.installCache()
})
}
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onActivate(evt: any) {
console.log("service worker activate")
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// Only keep current version of the cache and delete old caches
let cacheWhitelist = [this.cache.version]
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let deleteOldCache = caches.keys().then(keyList => {
return Promise.all(keyList.map(key => {
if(cacheWhitelist.indexOf(key) === -1) {
return caches.delete(key)
}
}))
})
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// Immediate claim helps us gain control over a new client immediately
let immediateClaim = (self as any).clients.claim()
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return Promise.all([
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deleteOldCache,
immediateClaim
])
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}
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onRequest(evt: FetchEvent) {
let request = evt.request as Request
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// If it's not a GET request, fetch it normally
if(request.method !== "GET") {
return evt.respondWith(fetch(request))
}
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// Clear cache on authentication and fetch it normally
if(request.url.includes("/auth/") || request.url.includes("/logout")) {
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return evt.respondWith(caches.delete(this.cache.version).then(() => fetch(request)))
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}
// Exclude certain URLs from being cached
for(let pattern of EXCLUDECACHE.keys()) {
if(request.url.includes(pattern)) {
return evt.respondWith(fetch(request))
}
}
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// If the request included the header "X-CacheOnly", return a cache-only response.
// This is used in reloads to avoid generating a 2nd request after a cache refresh.
if(request.headers.get("X-CacheOnly") === "true") {
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return evt.respondWith(this.fromCache(request))
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}
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// Start fetching the request
let refresh = fetch(request).then(response => {
let clone = response.clone()
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// Save the new version of the resource in the cache
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let cacheRefresh = this.cache.store(request, clone)
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CACHEREFRESH.set(request.url, cacheRefresh)
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return response
})
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// Save in map
RELOADS.set(request.url, refresh)
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// Forced reload
let servedETag = undefined
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let onResponse = response => {
servedETag = response.headers.get("ETag")
ETAGS.set(request.url, servedETag)
return response
}
if(request.headers.get("X-Reload") === "true") {
return evt.respondWith(refresh.then(onResponse))
}
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// Try to serve cache first and fall back to network response
let networkOrCache = this.fromCache(request).then(onResponse).catch(error => {
// console.log("Cache MISS:", request.url)
return refresh
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})
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return evt.respondWith(networkOrCache)
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}
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onMessage(evt: any) {
let message = JSON.parse(evt.data)
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switch(message.type) {
case "loaded":
this.onDOMContentLoaded(evt, message.url)
break
}
}
// onDOMContentLoaded is called when the client sent this service worker
// a message that the page has been loaded.
onDOMContentLoaded(evt: any, url: string) {
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let refresh = RELOADS.get(url)
let servedETag = ETAGS.get(url)
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// If the user requests a sub-page we should prefetch the full page, too.
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if(url.includes("/_/") && !url.includes("/_/search/")) {
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this.prefetchFullPage(url)
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}
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if(!refresh || !servedETag) {
return Promise.resolve()
}
return refresh.then((response: Response) => {
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// When the actual network request was used by the client, response.bodyUsed is set.
// In that case the client is already up to date and we don"t need to tell the client to do a refresh.
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if(response.bodyUsed) {
return
}
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// Get the ETag of the cached response we sent to the client earlier.
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let eTag = response.headers.get("ETag")
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// Update ETag
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ETAGS.set(url, eTag)
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// Get CSP
let oldCSP = this.currentCSP
let csp = response.headers.get("Content-Security-Policy")
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// If the CSP and therefore the sha-1 hash of the CSS changed, we need to do a reload.
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if(csp != oldCSP) {
this.currentCSP = csp
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if(oldCSP !== "") {
return this.forceClientReloadPage(url, evt.source)
}
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}
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// If the ETag changed, we need to do a reload.
if(eTag !== servedETag) {
return this.forceClientReloadContent(url, evt.source)
}
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// Do nothing
return Promise.resolve()
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})
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}
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prefetchFullPage(url: string) {
let fullPage = new Request(url.replace("/_/", "/"))
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// Disable HTTP/2 push responses
let headers = new Headers({
"X-Source": "service-worker"
})
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let fullPageRefresh = fetch(fullPage, {
credentials: "same-origin",
headers
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}).then(response => {
// Save the new version of the resource in the cache
let cacheRefresh = caches.open(this.cache.version).then(cache => {
return cache.put(fullPage, response)
})
CACHEREFRESH.set(fullPage.url, cacheRefresh)
return response
})
// Save in map
RELOADS.set(fullPage.url, fullPageRefresh)
}
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onPush(evt: PushEvent) {
var payload = evt.data ? evt.data.json() : {}
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return (self as any).registration.showNotification(payload.title, {
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body: payload.message,
icon: payload.icon,
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image: payload.image,
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data: payload.link,
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badge: "https://notify.moe/brand/64.png"
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})
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}
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onPushSubscriptionChange(evt: any) {
return (self as any).registration.pushManager.subscribe(evt.oldSubscription.options)
.then(async subscription => {
console.log("send subscription to server...")
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let rawKey = subscription.getKey("p256dh")
let key = rawKey ? btoa(String.fromCharCode.apply(null, new Uint8Array(rawKey))) : ""
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let rawSecret = subscription.getKey("auth")
let secret = rawSecret ? btoa(String.fromCharCode.apply(null, new Uint8Array(rawSecret))) : ""
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let endpoint = subscription.endpoint
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let pushSubscription = {
endpoint,
p256dh: key,
auth: secret,
platform: navigator.platform,
userAgent: navigator.userAgent,
screen: {
width: window.screen.width,
height: window.screen.height
}
}
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let user = await fetch("/api/me").then(response => response.json())
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return fetch("/api/pushsubscriptions/" + user.id + "/add", {
method: "POST",
credentials: "same-origin",
body: JSON.stringify(pushSubscription)
})
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})
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}
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onNotificationClick(evt: NotificationEvent) {
let notification = evt.notification
notification.close()
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return (self as any).clients.matchAll().then(function(clientList) {
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// If we have a link, use that link to open a new window.
let url = notification.data
if(url) {
return (self as any).clients.openWindow(url)
}
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// If there is at least one client, focus it.
if(clientList.length > 0) {
return clientList[0].focus()
}
// Otherwise open a new window
return (self as any).clients.openWindow("https://notify.moe")
})
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}
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forceClientReloadContent(url: string, eventSource: any) {
let message = {
type: "new content",
url
}
this.postMessageAfterPromise(message, CACHEREFRESH.get(url), eventSource)
}
forceClientReloadPage(url: string, eventSource: any) {
let message = {
type: "reload page",
url
}
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this.postMessageAfterPromise(message, RELOADS.get(url.replace("/_/", "/")), eventSource)
}
postMessageAfterPromise(message: any, promise: Promise<any>, eventSource: any) {
if(!promise) {
console.log("forcing reload, cache refresh null")
return eventSource.postMessage(JSON.stringify(message))
}
return promise.then(() => {
console.log("forcing reload after cache refresh")
eventSource.postMessage(JSON.stringify(message))
})
}
installCache() {
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// TODO: Implement a solution that caches resources with credentials: "same-origin"
return Promise.resolve()
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// return caches.open(this.cache.version).then(cache => {
// return cache.addAll([
// "./",
// "./scripts",
// "https://fonts.gstatic.com/s/ubuntu/v11/4iCs6KVjbNBYlgoKfw7z.ttf"
// ])
// })
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}
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fromCache(request) {
return caches.open(this.cache.version).then(cache => {
return cache.match(request).then(matching => {
if(matching) {
// console.log("Cache HIT:", request.url)
return Promise.resolve(matching)
}
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return Promise.reject("no-match")
})
})
}
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}
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const serviceWorker = new MyServiceWorker()