Resurrect Service Worker (#7108)

* Resolve #7106

* fix lint

* fix lint

* save lang in idb

* fix lint

* fix

* cache locale file

* fix lint

* ✌️

* wip

* fix [wip]

* fix [wip]

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>

src/client/sw/compose-notification.ts

@@ -1,8 +1,17 @@
+/**
+ * Notification composer of Service Worker
+ */
+declare var self: ServiceWorkerGlobalScope;
+
 import { getNoteSummary } from '../../misc/get-note-summary';
 import getUserName from '../../misc/get-user-name';
-import { i18n } from '@/sw/i18n';
 
-export default async function(type, data): Promise<[string, NotificationOptions]> {
+export default async function(type, data, i18n): Promise<[string, NotificationOptions] | null | undefined> {
+	if (!i18n) {
+		console.log('no i18n');
+		return;
+	}
+
 	switch (type) {
 		case 'driveFileCreated': // TODO (Server Side)
 			return [i18n.t('_notification.fileUploaded'), {

src/client/sw/i18n.ts

@@ -1,5 +0,0 @@
-import { I18n } from '@/i18n';
-
-export const i18n = new I18n({
-	// TODO
-});

src/client/sw/sw.ts

@@ -3,17 +3,30 @@
  */
 declare var self: ServiceWorkerGlobalScope;
 
+import { get, set } from 'idb-keyval';
 import composeNotification from '@/sw/compose-notification';
+import { I18n } from '@/scripts/i18n';
 
+//#region Variables
 const version = _VERSION_;
 const cacheName = `mk-cache-${version}`;
-
 const apiUrl = `${location.origin}/api/`;
 
-// インストールされたとき
-self.addEventListener('install', ev => {
-	console.info('installed');
+let lang: string;
+let i18n: I18n<any>;
+let pushesPool: any[] = [];
+//#endregion
 
+//#region Startup
+get('lang').then(async prelang => {
+	if (!prelang) return;
+	lang = prelang;
+	return fetchLocale();
+});
+//#endregion
+
+//#region Lifecycle: Install
+self.addEventListener('install', ev => {
 	ev.waitUntil(
 		caches.open(cacheName)
 			.then(cache => {
@@ -24,7 +37,9 @@ self.addEventListener('install', ev => {
 			.then(() => self.skipWaiting())
 	);
 });
+//#endregion
 
+//#region Lifecycle: Activate
 self.addEventListener('activate', ev => {
 	ev.waitUntil(
 		caches.keys()
@@ -36,7 +51,9 @@ self.addEventListener('activate', ev => {
 			.then(() => self.clients.claim())
 	);
 });
+//#endregion
 
+//#region When: Fetching
 self.addEventListener('fetch', ev => {
 	if (ev.request.method !== 'GET' || ev.request.url.startsWith(apiUrl)) return;
 	ev.respondWith(
@@ -49,8 +66,9 @@ self.addEventListener('fetch', ev => {
 			})
 	);
 });
+//#endregion
 
-// プッシュ通知を受け取ったとき
+//#region When: Caught Notification
 self.addEventListener('push', ev => {
 	// クライアント取得
 	ev.waitUntil(self.clients.matchAll({
@@ -59,8 +77,65 @@ self.addEventListener('push', ev => {
 		// クライアントがあったらストリームに接続しているということなので通知しない
 		if (clients.length != 0) return;
 
-		const { type, body } = ev.data.json();
+		const { type, body } = ev.data?.json();
 
-		return self.registration.showNotification(...(await composeNotification(type, body)));
+		// localeを読み込めておらずi18nがundefinedだった場合はpushesPoolにためておく
+		if (!i18n) return pushesPool.push({ type, body });
+
+		const n = await composeNotification(type, body, i18n);
+		if (n) return self.registration.showNotification(...n);
 	}));
 });
+//#endregion
+
+//#region When: Caught a message from the client
+self.addEventListener('message', ev => {
+	switch(ev.data) {
+		case 'clear':
+			return; // TODO
+		default:
+			break;
+	}
+
+	if (typeof ev.data === 'object') {
+		// E.g. '[object Array]' → 'array'
+		const otype = Object.prototype.toString.call(ev.data).slice(8, -1).toLowerCase();
+
+		if (otype === 'object') {
+			if (ev.data.msg === 'initialize') {
+				lang = ev.data.lang;
+				set('lang', lang);
+				fetchLocale();
+			}
+		}
+	}
+});
+//#endregion
+
+//#region Function: (Re)Load i18n instance
+async function fetchLocale() {
+	//#region localeファイルの読み込み
+	// Service Workerは何度も起動しそのたびにlocaleを読み込むので、CacheStorageを使う
+	const localeUrl = `/assets/locales/${lang}.${version}.json`;
+	let localeRes = await caches.match(localeUrl);
+
+	if (!localeRes) {
+		localeRes = await fetch(localeUrl);
+		const clone = localeRes?.clone();
+		if (!clone?.clone().ok) return;
+
+		caches.open(cacheName).then(cache => cache.put(localeUrl, clone));
+	}
+
+	i18n = new I18n(await localeRes.json());
+	//#endregion
+
+	//#region i18nをきちんと読み込んだ後にやりたい処理
+	for (const { type, body } of pushesPool) {
+		const n = await composeNotification(type, body, i18n);
+		if (n) self.registration.showNotification(...n);
+	}
+	pushesPool = [];
+	//#endregion
+}
+//#endregion