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0c92e8a8d2
* docs: cache the preferred lang pages in the PWA * chore: remove index.html in manifest * fix: no cache the '/' page * perf: optimize code * docs: add always refresh from PWA
190 lines
5.0 KiB
TypeScript
190 lines
5.0 KiB
TypeScript
import { cacheNames, clientsClaim } from 'workbox-core'
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import type { ManifestEntry } from 'workbox-build'
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declare let self: ServiceWorkerGlobalScope & {
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__WB_MANIFEST: ManifestEntry[]
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}
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const manifest = self.__WB_MANIFEST
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const cacheName = cacheNames.runtime
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const defaultLang = manifest.some((item) => {
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return item.url.includes(navigator.language)
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})
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? navigator.language
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: 'en-US'
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let userPreferredLang = ''
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let cacheEntries: RequestInfo[] = []
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let cacheManifestURLs: string[] = []
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let manifestURLs: string[] = []
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class LangDB {
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private db: IDBDatabase | undefined
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private databaseName = 'PWA_DB'
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private version = 1
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private storeNames = 'lang'
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constructor() {
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this.initDB()
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}
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private initDB() {
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return new Promise<boolean>((resolve) => {
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const request = indexedDB.open(this.databaseName, this.version)
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request.onsuccess = (event) => {
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this.db = (event.target as IDBOpenDBRequest).result
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resolve(true)
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}
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request.onupgradeneeded = (event) => {
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this.db = (event.target as IDBOpenDBRequest).result
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if (!this.db.objectStoreNames.contains(this.storeNames)) {
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this.db.createObjectStore(this.storeNames, { keyPath: 'id' })
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}
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}
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})
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}
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private async initLang() {
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this.db!.transaction(this.storeNames, 'readwrite')
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.objectStore(this.storeNames)
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.add({ id: 1, lang: defaultLang })
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}
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async getLang() {
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if (!this.db) await this.initDB()
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return new Promise<string>((resolve) => {
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const request = this.db!.transaction(this.storeNames)
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.objectStore(this.storeNames)
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.get(1)
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request.onsuccess = () => {
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if (request.result) {
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resolve(request.result.lang)
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} else {
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this.initLang()
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resolve(defaultLang)
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}
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}
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request.onerror = () => {
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resolve(defaultLang)
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}
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})
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}
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async setLang(lang: string) {
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if (userPreferredLang !== lang) {
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userPreferredLang = lang
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cacheEntries = []
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cacheManifestURLs = []
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manifestURLs = []
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if (!this.db) await this.initDB()
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this.db!.transaction(this.storeNames, 'readwrite')
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.objectStore(this.storeNames)
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.put({ id: 1, lang })
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}
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}
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}
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async function initManifest() {
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userPreferredLang = userPreferredLang || (await langDB.getLang())
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// match the data that needs to be cached
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// NOTE: When the structure of the document dist files changes, it needs to be changed here
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const cacheList = [
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userPreferredLang,
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`assets/(${userPreferredLang}|app|index|style|chunks)`,
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'images',
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'android-chrome',
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'apple-touch-icon',
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'manifest.webmanifest',
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]
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const regExp = new RegExp(`^(${cacheList.join('|')})`)
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for (const item of manifest) {
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const url = new URL(item.url, self.location.origin)
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manifestURLs.push(url.href)
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if (regExp.test(item.url) || /^\/$/.test(item.url)) {
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const request = new Request(url.href, { credentials: 'same-origin' })
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cacheEntries.push(request)
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cacheManifestURLs.push(url.href)
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}
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}
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}
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const langDB = new LangDB()
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self.addEventListener('install', (event) => {
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event.waitUntil(
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caches.open(cacheName).then(async (cache) => {
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if (!cacheEntries.length) await initManifest()
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return cache.addAll(cacheEntries)
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})
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)
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})
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self.addEventListener('activate', (event: ExtendableEvent) => {
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// clean up outdated runtime cache
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event.waitUntil(
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caches.open(cacheName).then(async (cache) => {
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if (!cacheManifestURLs.length) await initManifest()
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cache.keys().then((keys) => {
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keys.forEach((request) => {
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// clean up those who are not listed in cacheManifestURLs
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!cacheManifestURLs.includes(request.url) && cache.delete(request)
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})
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})
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})
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)
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})
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self.addEventListener('fetch', (event) => {
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event.respondWith(
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caches.match(event.request).then(async (response) => {
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// when the cache is hit, it returns directly to the cache
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if (response) return response
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if (!manifestURLs.length) await initManifest()
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const requestClone = event.request.clone()
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// otherwise create a new fetch request
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return fetch(requestClone)
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.then((response) => {
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const responseClone = response.clone()
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if (response.type !== 'basic' && response.status !== 200) {
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return response
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}
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// cache the data contained in the manifestURLs list
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manifestURLs.includes(requestClone.url) &&
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caches.open(cacheName).then((cache) => {
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cache.put(requestClone, responseClone)
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})
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return response
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})
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.catch((err) => {
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throw new Error(`Failed to load resource ${requestClone.url}, ${err}`)
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})
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})
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)
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})
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self.addEventListener('message', (event) => {
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if (event.data) {
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if (event.data.type === 'SKIP_WAITING') {
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self.skipWaiting()
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} else if (event.data.type === 'LANG') {
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langDB.setLang(event.data.lang)
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}
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}
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})
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clientsClaim()
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