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check if window has secureContext #928

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check if window has secureContext #928

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37 changes: 24 additions & 13 deletions flutter_secure_storage_web/lib/flutter_secure_storage_web.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,18 @@ class FlutterSecureStorageWeb extends FlutterSecureStoragePlatform {
FlutterSecureStoragePlatform.instance = FlutterSecureStorageWeb();
}

web.Crypto get _crypto {
if (web.window.isSecureContext) {
return web.window.crypto;
}

throw UnsupportedError(
'FlutterSecureStorageWeb only works in secure contexts '
'Refer to the documentation for more information: '
'https://pub.dev/packages/flutter_secure_storage#configure-web-version',
);
}

web.Storage _getStorage(Map<String, String> options) {
return options[_useSessionStorage] == 'true'
? web.window.sessionStorage
Expand Down Expand Up @@ -129,7 +141,7 @@ class FlutterSecureStorageWeb extends FlutterSecureStoragePlatform {
if (useWrapKey) {
final unwrappingKey = await _getWrapKey(options);
final unwrapAlgorithm = _getWrapAlgorithm(options);
encryptionKey = await web.window.crypto.subtle
encryptionKey = await _crypto.subtle
.unwrapKey(
'raw',
jwk.toJS,
Expand All @@ -141,7 +153,7 @@ class FlutterSecureStorageWeb extends FlutterSecureStoragePlatform {
)
.toDart;
} else {
encryptionKey = await web.window.crypto.subtle
encryptionKey = await _crypto.subtle
.importKey(
'raw',
jwk.toJS,
Expand All @@ -152,15 +164,15 @@ class FlutterSecureStorageWeb extends FlutterSecureStoragePlatform {
.toDart;
}
} else {
encryptionKey = (await web.window.crypto.subtle
encryptionKey = (await _crypto.subtle
.generateKey(algorithm, true, ['encrypt', 'decrypt'].toJS)
.toDart)! as web.CryptoKey;

final js_interop.JSAny? jsonWebKey;
if (useWrapKey) {
final wrappingKey = await _getWrapKey(options);
final wrapAlgorithm = _getWrapAlgorithm(options);
jsonWebKey = await web.window.crypto.subtle
jsonWebKey = await _crypto.subtle
.wrapKey(
'raw',
encryptionKey,
Expand All @@ -169,9 +181,8 @@ class FlutterSecureStorageWeb extends FlutterSecureStoragePlatform {
)
.toDart;
} else {
jsonWebKey = await web.window.crypto.subtle
.exportKey('raw', encryptionKey)
.toDart;
jsonWebKey =
await _crypto.subtle.exportKey('raw', encryptionKey).toDart;
}

storage[key] = base64Encode(
Expand All @@ -185,7 +196,7 @@ class FlutterSecureStorageWeb extends FlutterSecureStoragePlatform {
Future<web.CryptoKey> _getWrapKey(Map<String, String> options) async {
final wrapKey = base64Decode(options[_wrapKey]!);
final algorithm = _getWrapAlgorithm(options);
return web.window.crypto.subtle
return _crypto.subtle
.importKey(
'raw',
wrapKey.toJS,
Expand All @@ -211,15 +222,15 @@ class FlutterSecureStorageWeb extends FlutterSecureStoragePlatform {
required String value,
required Map<String, String> options,
}) async {
final iv = (web.window.crypto.getRandomValues(Uint8List(12).toJS)
as js_interop.JSUint8Array)
.toDart;
final iv =
(_crypto.getRandomValues(Uint8List(12).toJS) as js_interop.JSUint8Array)
.toDart;

final algorithm = _getAlgorithm(iv);

final encryptionKey = await _getEncryptionKey(algorithm, options);

final encryptedContent = (await web.window.crypto.subtle
final encryptedContent = (await _crypto.subtle
.encrypt(
algorithm,
encryptionKey,
Expand Down Expand Up @@ -250,7 +261,7 @@ class FlutterSecureStorageWeb extends FlutterSecureStoragePlatform {

final value = base64Decode(parts[1]);

final decryptedContent = await web.window.crypto.subtle
final decryptedContent = await _crypto.subtle
.decrypt(
_getAlgorithm(iv),
decryptionKey,
Expand Down