46 lines
1.2 KiB
TypeScript
46 lines
1.2 KiB
TypeScript
/*
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* Language manager for SW
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*/
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import { get, set } from "idb-keyval";
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import { I18n, type Locale } from "@/scripts/i18n";
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class SwLang {
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public cacheName = `mk-cache-${_VERSION_}`;
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public lang: Promise<string> = get("lang").then(async (prelang) => {
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if (!prelang) return "en-US";
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return prelang;
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});
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public setLang(newLang: string): Promise<I18n<Locale>> {
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this.lang = Promise.resolve(newLang);
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set("lang", newLang);
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return this.fetchLocale();
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}
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public i18n: Promise<I18n> | null = null;
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public fetchLocale(): Promise<I18n<Locale>> {
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return (this.i18n = this._fetch());
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}
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private async _fetch(): Promise<I18n<Locale>> {
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// Service Workerは何度も起動しそのたびにlocaleを読み込むので、CacheStorageを使う
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const localeUrl = `/assets/locales/${await this.lang}.${_VERSION_}.json`;
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let localeRes = await caches.match(localeUrl);
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// _DEV_がtrueの場合は常に最新化
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if (!localeRes || _DEV_) {
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localeRes = await fetch(localeUrl);
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const clone = localeRes.clone();
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if (!clone.clone().ok) throw new Error("locale fetching error");
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caches.open(this.cacheName).then((cache) => cache.put(localeUrl, clone));
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}
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return new I18n<Locale>(await localeRes.json());
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}
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}
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export const swLang = new SwLang();
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