fix(core): Check for storage initialization errors

packages/aws-amplify/package.json

@@ -293,7 +293,7 @@
 			"name": "[Analytics] record (Pinpoint)",
 			"path": "./dist/esm/analytics/index.mjs",
 			"import": "{ record }",
-			"limit": "17.41 kB"
+			"limit": "17.5 kB"
 		},
 		{
 			"name": "[Analytics] record (Kinesis)",
@@ -317,7 +317,7 @@
 			"name": "[Analytics] identifyUser (Pinpoint)",
 			"path": "./dist/esm/analytics/index.mjs",
 			"import": "{ identifyUser }",
-			"limit": "15.91 kB"
+			"limit": "15.95 kB"
 		},
 		{
 			"name": "[Analytics] enable",
@@ -497,7 +497,7 @@
 			"name": "[Storage] uploadData (S3)",
 			"path": "./dist/esm/storage/index.mjs",
 			"import": "{ uploadData }",
-			"limit": "20.08 kB"
+			"limit": "20.15 kB"
 		}
 	]
 }

packages/core/__tests__/storage/DefaultStorage.test.ts

@@ -1,4 +1,5 @@
 import { DefaultStorage } from '../../src/storage/DefaultStorage';
+import { InMemoryStorage } from '../../src/storage/InMemoryStorage';
 
 const key = 'k';
 const value = 'value';
@@ -35,4 +36,25 @@ describe('DefaultStorage', () => {
 		await defaultStorage.clear();
 		expect(defaultStorage.getItem(key)).resolves.toBeNull();
 	});
+
+	it('should fall back to alternative storage when localStorage is not accessible', async () => {
+		// Mock window.localStorage to throw an error
+		const originalLocalStorage = window.localStorage;
+
+		Object.defineProperty(window, 'localStorage', {
+			value: undefined,
+			writable: true,
+		});
+
+		// Create a new DefaultStorage instance to trigger the fallback
+		const fallbackStorage = new DefaultStorage();
+
+		// Verify that the storage still works as expected
+		expect(fallbackStorage.storage instanceof InMemoryStorage).toEqual(true);
+
+		// Restore the original localStorage
+		Object.defineProperty(window, 'localStorage', {
+			value: originalLocalStorage,
+		});
+	});
 });

packages/core/__tests__/storage/SessionStorage.test.ts

@@ -1,9 +1,10 @@
+import { InMemoryStorage } from '../../src/storage/InMemoryStorage';
 import { SessionStorage } from '../../src/storage/SessionStorage';
 
 const key = 'k';
 const value = 'value';
 
-describe('sessionStorage', () => {
+describe('SessionStorage', () => {
 	let sessionStorage: SessionStorage;
 
 	beforeEach(() => {
@@ -37,4 +38,25 @@ describe('sessionStorage', () => {
 		await sessionStorage.clear();
 		expect(await sessionStorage.getItem(key)).toBeNull();
 	});
+
+	it('should fall back to alternative storage when sessionStorage is not accessible', async () => {
+		// Mock window.sessionStorage to throw an error
+		const originalSessionStorage = window.sessionStorage;
+
+		Object.defineProperty(window, 'sessionStorage', {
+			value: undefined,
+			writable: true,
+		});
+
+		// Create a new SessionStorage instance to trigger the fallback
+		const fallbackStorage = new SessionStorage();
+
+		// Verify that the storage still works as expected
+		expect(fallbackStorage.storage instanceof InMemoryStorage).toEqual(true);
+
+		// Restore the original sessionStorage
+		Object.defineProperty(window, 'sessionStorage', {
+			value: originalSessionStorage,
+		});
+	});
 });

packages/core/package.json

@@ -106,7 +106,7 @@
 			"name": "Cache (default browser storage)",
 			"path": "./dist/esm/index.mjs",
 			"import": "{ Cache }",
-			"limit": "3.3 kB"
+			"limit": "3.4 kB"
 		}
 	],
 	"exports": {

packages/core/src/storage/utils.ts

@@ -1,22 +1,51 @@
 // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 
+import { ConsoleLogger } from '../Logger';
+
 import { InMemoryStorage } from './InMemoryStorage';
 
 /**
  * @internal
  * @returns Either a reference to window.localStorage or an in-memory storage as fallback
  */
-export const getLocalStorageWithFallback = (): Storage =>
-	typeof window !== 'undefined' && window.localStorage
-		? window.localStorage
-		: new InMemoryStorage();
+
+const logger = new ConsoleLogger('CoreStorageUtils');
+
+export const getLocalStorageWithFallback = (): Storage => {
+	try {
+		// Attempt to use localStorage directly
+		if (typeof window !== 'undefined' && window.localStorage) {
+			return window.localStorage;
+		}
+	} catch (e) {
+		// Handle any errors related to localStorage access
+		logger.error('LocalStorage access failed:', e);
+	}
+
+	// Return in-memory storage as a fallback if localStorage is not accessible
+	return new InMemoryStorage();
+};
 
 /**
  * @internal
  * @returns Either a reference to window.sessionStorage or an in-memory storage as fallback
  */
-export const getSessionStorageWithFallback = (): Storage =>
-	typeof window !== 'undefined' && window.sessionStorage
-		? window.sessionStorage
-		: new InMemoryStorage();
+export const getSessionStorageWithFallback = (): Storage => {
+	try {
+		// Attempt to use sessionStorage directly
+		if (typeof window !== 'undefined' && window.sessionStorage) {
+			// Verify we can actually use it by testing access
+			window.sessionStorage.getItem('test');
+
+			return window.sessionStorage;
+		}
+
+		throw new Error('sessionStorage is not defined');
+	} catch (e) {
+		// Handle any errors related to sessionStorage access
+		logger.error('SessionStorage access failed:', e);
+
+		return new InMemoryStorage();
+	}
+};