refactor(frontend): scripts -> utility

packages/frontend/src/utility/idb-proxy.ts

@@ -0,0 +1,53 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+// FirefoxのプライベートモードなどではindexedDBが使用不可能なので、
+// indexedDBが使えない環境ではlocalStorageを使う
+import {
+	get as iget,
+	set as iset,
+	del as idel,
+} from 'idb-keyval';
+import { miLocalStorage } from '@/local-storage.js';
+
+const PREFIX = 'idbfallback::';
+
+let idbAvailable = typeof window !== 'undefined' ? !!(window.indexedDB && typeof window.indexedDB.open === 'function') : true;
+
+// iframe.contentWindow.indexedDB.deleteDatabase() がchromeのバグで使用できないため、indexedDBを無効化している。
+// バグが治って再度有効化するのであれば、cypressのコマンド内のコメントアウトを外すこと
+// see https://github.com/misskey-dev/misskey/issues/13605#issuecomment-2053652123
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-expect-error
+if (window.Cypress) {
+	idbAvailable = false;
+	console.log('Cypress detected. It will use localStorage.');
+}
+
+if (idbAvailable) {
+	await iset('idb-test', 'test')
+		.catch(err => {
+			console.error('idb error', err);
+			console.error('indexedDB is unavailable. It will use localStorage.');
+			idbAvailable = false;
+		});
+} else {
+	console.error('indexedDB is unavailable. It will use localStorage.');
+}
+
+export async function get(key: string) {
+	if (idbAvailable) return iget(key);
+	return miLocalStorage.getItemAsJson(`${PREFIX}${key}`);
+}
+
+export async function set(key: string, val: any) {
+	if (idbAvailable) return iset(key, val);
+	return miLocalStorage.setItemAsJson(`${PREFIX}${key}`, val);
+}
+
+export async function del(key: string) {
+	if (idbAvailable) return idel(key);
+	return miLocalStorage.removeItem(`${PREFIX}${key}`);
+}