refactoring

Resolve #7779

packages/client/src/sw/sw.ts

@@ -0,0 +1,123 @@
+/**
+ * Service Worker
+ */
+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}`;
+
+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 => {
+	self.skipWaiting();
+});
+//#endregion
+
+//#region Lifecycle: Activate
+self.addEventListener('activate', ev => {
+	ev.waitUntil(
+		caches.keys()
+			.then(cacheNames => Promise.all(
+				cacheNames
+					.filter((v) => v !== cacheName)
+					.map(name => caches.delete(name))
+			))
+			.then(() => self.clients.claim())
+	);
+});
+//#endregion
+
+//#region When: Fetching
+self.addEventListener('fetch', ev => {
+	// Nothing to do
+});
+//#endregion
+
+//#region When: Caught Notification
+self.addEventListener('push', ev => {
+	// クライアント取得
+	ev.waitUntil(self.clients.matchAll({
+		includeUncontrolled: true
+	}).then(async clients => {
+		// 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();
+
+		// 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