enhance: embedページではstoreの保存先を完全に分離するように

packages/frontend/src/local-storage.ts

@@ -2,8 +2,9 @@
  * SPDX-FileCopyrightText: syuilo and misskey-project
  * SPDX-License-Identifier: AGPL-3.0-only
  */
+import { isEmbedPage, initEmbedPageLocalStorage } from "@/scripts/embed-page.js";
 
-type Keys =
+export type Keys =
 	'v' |
 	'lastVersion' |
 	'instance' |
@@ -38,12 +39,33 @@ type Keys =
 	`aiscript:${string}` |
 	'lastEmojisFetchedAt' | // DEPRECATED, stored in indexeddb (13.9.0~)
 	'emojis' | // DEPRECATED, stored in indexeddb (13.9.0~);
-	`channelLastReadedAt:${string}`
+	`channelLastReadedAt:${string}` |
+	`idbfallback::${string}`
+
+// セッション毎に廃棄されるLocalStorage代替（embedなどで使用）
+const safeSessionStorage = new Map<Keys, string>();
 
 export const miLocalStorage = {
-	getItem: (key: Keys): string | null => window.localStorage.getItem(key),
-	setItem: (key: Keys, value: string): void => window.localStorage.setItem(key, value),
-	removeItem: (key: Keys): void => window.localStorage.removeItem(key),
+	getItem: (key: Keys): string | null => {
+		if (isEmbedPage()) {
+			return safeSessionStorage.get(key) ?? null;
+		}
+		return window.localStorage.getItem(key);
+	},
+	setItem: (key: Keys, value: string): void => {
+		if (isEmbedPage()) {
+			safeSessionStorage.set(key, value);
+		} else {
+			window.localStorage.setItem(key, value);
+		}
+	},
+	removeItem: (key: Keys): void => {
+		if (isEmbedPage()) {
+			safeSessionStorage.delete(key);
+		} else {
+			window.localStorage.removeItem(key);
+		}
+	},
 	getItemAsJson: (key: Keys): any | undefined => {
 		const item = miLocalStorage.getItem(key);
 		if (item === null) {
@@ -51,5 +73,12 @@ export const miLocalStorage = {
 		}
 		return JSON.parse(item);
 	},
-	setItemAsJson: (key: Keys, value: any): void => window.localStorage.setItem(key, JSON.stringify(value)),
+	setItemAsJson: (key: Keys, value: any): void => {
+		miLocalStorage.setItem(key, JSON.stringify(value));
+	},
 };
+
+if (isEmbedPage()) {
+	initEmbedPageLocalStorage();
+	if (_DEV_) console.warn('Using safeSessionStorage as localStorage alternative');
+}