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fix(auth): Uncaught Hosted UI cancellation (#3686)
* chore(auth): Use `EventCompleter.ignore` instead of `unawaited` `unawaited` will still raise an error if there is one. By using `EventCompleter.ignore` we drop all completions, success or error. * fix(auth): Uncaught Hosted UI cancellation The HostedUIPlatform had a bug due to the fact that it both called `dispatcher.dispatchAndComplete` (which throws on failure states) and throwing a `UserCancelledException` which triggers a failure state. This lead to the error being thrown from `signInWithWebUI` and an uncaught exception being raised at the `dispatchAndComplete` call. This resolves the issue by only throwing from the HostedUiPlatform and letting the state machine resolving the cancellation. This also fixes an issue where `cancelSignIn` was never being called because the state machine was in a `signingIn` state at the time the cancellation was dispatched.
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packages/auth/amplify_auth_cognito/test/hosted_ui_platform_flutter_test.dart
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| // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| // ignore_for_file: invalid_use_of_internal_member, non_constant_identifier_names | ||
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| import 'package:amplify_auth_cognito/amplify_auth_cognito.dart'; | ||
| import 'package:amplify_auth_cognito/src/flows/hosted_ui/hosted_ui_platform_flutter.dart'; | ||
| import 'package:amplify_auth_cognito/src/native_auth_plugin.g.dart'; | ||
| import 'package:amplify_auth_cognito_dart/src/flows/hosted_ui/hosted_ui_platform.dart'; | ||
| import 'package:amplify_auth_cognito_dart/src/state/cognito_state_machine.dart'; | ||
| import 'package:amplify_auth_cognito_dart/src/state/state.dart'; | ||
| import 'package:amplify_auth_cognito_test/amplify_auth_cognito_test.dart'; | ||
| import 'package:amplify_flutter/amplify_flutter.dart'; | ||
| import 'package:flutter/foundation.dart'; | ||
| import 'package:flutter/services.dart'; | ||
| import 'package:flutter_test/flutter_test.dart'; | ||
|
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| void main() { | ||
| AWSLogger().logLevel = LogLevel.verbose; | ||
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| group('HostedUiPlatformFlutter', () { | ||
| late AmplifyAuthCognito plugin; | ||
| late SecureStorageInterface secureStorage; | ||
| late DependencyManager dependencyManager; | ||
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| setUp(() async { | ||
| secureStorage = MockSecureStorage(); | ||
| dependencyManager = DependencyManager() | ||
| ..addInstance(hostedUiConfig) | ||
| ..addInstance<SecureStorageInterface>(secureStorage) | ||
| ..addInstance<NativeAuthBridge>(ThrowingNativeBridge()); | ||
| plugin = AmplifyAuthCognito() | ||
| ..stateMachine = CognitoAuthStateMachine( | ||
| dependencyManager: dependencyManager, | ||
| ); | ||
| plugin.stateMachine.addBuilder<HostedUiPlatform>( | ||
| HostedUiPlatformImpl.new, | ||
| ); | ||
| await plugin.stateMachine.acceptAndComplete( | ||
| ConfigurationEvent.configure(mockConfig), | ||
| ); | ||
| }); | ||
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| tearDown(() => plugin.close()); | ||
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| test('can cancel flow', () async { | ||
| // Pretend to be iOS so that the `ThrowingNativeBridge` is called, | ||
| // mimicking a failure from the platform channel. | ||
| debugDefaultTargetPlatformOverride = TargetPlatform.iOS; | ||
| addTearDown(() => debugDefaultTargetPlatformOverride = null); | ||
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| final expectation = expectLater( | ||
| plugin.signInWithWebUI( | ||
| provider: AuthProvider.cognito, | ||
| ), | ||
| throwsA(isA<UserCancelledException>()), | ||
| ); | ||
| final hostedUiMachine = | ||
| plugin.stateMachine.expect(HostedUiStateMachine.type); | ||
| expect( | ||
| hostedUiMachine.stream, | ||
| emitsInOrder([ | ||
| isA<HostedUiSigningIn>(), | ||
| isA<HostedUiFailure>().having( | ||
| (s) => s.exception, | ||
| 'exception', | ||
| isA<UserCancelledException>(), | ||
| ), | ||
| emitsDone, | ||
| ]), | ||
| ); | ||
| await expectation; | ||
| // Ensure queue is flushed and done event is emitted after | ||
| // signInWithWebUI completes. | ||
| await hostedUiMachine.close(); | ||
| }); | ||
| }); | ||
| } | ||
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| final class ThrowingNativeBridge extends Fake implements NativeAuthBridge { | ||
| @override | ||
| Future<Map<String?, String?>> signInWithUrl( | ||
| String arg_url, | ||
| String arg_callbackUrlScheme, | ||
| bool arg_preferPrivateSession, | ||
| String? arg_browserPackageName, | ||
| ) async { | ||
| throw PlatformException(code: 'CANCELLED'); | ||
| } | ||
| } |
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