Always set tokenEndpoint using value of authorizationUri from `OA…

…uthSettings` during `LoginClient` initialization. (#338)

* Add option to override token endpoint during initialization

* Remove unused imports

* Update doc

* Extract getting credentials to private method

* Always set `tokenEndpoint` using value of `authorizationUri` from `OAuthSettings` during `LoginClient` initialization

* Update packages/login_client/CHANGELOG.md

Co-authored-by: Albert Wolszon <albert.wolszon@leancode.pl>

* Update packages/login_client/lib/src/login_client.dart

Co-authored-by: Albert Wolszon <albert.wolszon@leancode.pl>

* Update docs

* Test whether tokenEndpoint has been replaced

* Use copyWithTokenEndpoint in test

* Compare only tokenEndpoint in test

---------

Co-authored-by: Albert Wolszon <albert.wolszon@leancode.pl>

packages/login_client/CHANGELOG.md

@@ -1,5 +1,6 @@
-# Unreleased
+# 3.2.0
 
+- Always use `OAuthSettings.authorizationUri` for token endpoint in `LoginClient` initialization (for refreshing the token).
 - Bump `leancode_lint` dev dependency to `12.0.0`.
 - Bump `custom_lint` dev dependency to `0.6.4`.
 

packages/login_client/lib/src/login_client.dart

@@ -15,14 +15,10 @@
 import 'dart:async';
 
 import 'package:http/http.dart' as http;
+import 'package:login_client/login_client.dart';
 import 'package:meta/meta.dart';
 import 'package:oauth2/oauth2.dart' as oauth2;
 
-import 'credentials_storage/credentials_storage.dart';
-import 'credentials_storage/in_memory_credentials_storage.dart';
-import 'oauth_settings.dart';
-import 'refresh_exception.dart';
-import 'strategies/authorization_strategy.dart';
 import 'utils.dart';
 
 typedef _LoggerCallback = void Function(String);
@@ -87,8 +83,11 @@ class LoginClient extends http.BaseClient {
   Future<oauth2.Credentials?> get credentials => _credentialsStorage.read();
 
   /// Restores saved credentials from the credentials storage.
+  ///
+  /// `_oAuthSettings.authorizationUri` is used as the `tokenEndpoint`.
   Future<void> initialize() async {
-    final credentials = await _credentialsStorage.read();
+    final credentials = await getCredentialsToInitialize();
+
     if (credentials != null) {
       _oAuthClient = buildOAuth2ClientFromCredentials(
         credentials,
@@ -107,6 +106,25 @@ class LoginClient extends http.BaseClient {
     }
   }
 
+  /// Restores saved credentials from the credentials storage and sets
+  /// `tokenEndpoint` to the one provided in the `oAuthSettings`.
+  Future<Credentials?> getCredentialsToInitialize() async {
+    final credentials = await _credentialsStorage.read();
+
+    if (credentials != null) {
+      // Based on oauth package documentation, `Credentials` `tokenEndpoint` may
+      // be `null`, indicating that the credentials can't be refreshed.
+      if (credentials.tokenEndpoint != null) {
+        return credentials
+            .copyWithTokenEndpoint(_oAuthSettings.authorizationUri);
+      }
+
+      return credentials;
+    }
+
+    return null;
+  }
+
   /// Authorizes the [LoginClient] using the passed `strategy`.
   ///
   /// This method will log the [LoginClient] out on the authorization failure.

packages/login_client/lib/src/utils.dart

@@ -14,6 +14,7 @@
 
 import 'package:http/http.dart' as http;
 import 'package:oauth2/oauth2.dart' as oauth2;
+import 'package:oauth2/oauth2.dart';
 
 import 'oauth_settings.dart';
 
@@ -35,3 +36,18 @@ oauth2.Client buildOAuth2ClientFromCredentials(
     onCredentialsRefreshed: onCredentialsRefreshed,
   );
 }
+
+/// Extension methods for the [Credentials] class.
+extension CredentialsExt on Credentials {
+  /// Creates a copy of the current [Credentials] with the provided [tokenEndpoint].
+  Credentials copyWithTokenEndpoint(Uri newTokenEndpoint) {
+    return Credentials(
+      accessToken,
+      refreshToken: refreshToken,
+      idToken: idToken,
+      tokenEndpoint: newTokenEndpoint,
+      scopes: scopes,
+      expiration: expiration,
+    );
+  }
+}

packages/login_client/pubspec.yaml

@@ -1,5 +1,5 @@
 name: login_client
-version: 3.1.0
+version: 3.2.0
 homepage: https://github.com/leancodepl/flutter_corelibrary/tree/master/packages/login_client
 repository: https://github.com/leancodepl/flutter_corelibrary
 description: >-

packages/login_client/test/login_client_test.dart

@@ -8,6 +8,7 @@ import 'package:http/http.dart'
         StreamedRequest,
         StreamedResponse;
 import 'package:login_client/login_client.dart';
+import 'package:login_client/src/utils.dart';
 import 'package:mocktail/mocktail.dart';
 import 'package:oauth2/oauth2.dart';
 import 'package:test/test.dart';
@@ -31,7 +32,10 @@ void main() {
 
     setUpAll(() {
       registerFallbackValue(
-        OAuthSettings(authorizationUri: Uri(), clientId: ''),
+        OAuthSettings(
+          authorizationUri: Uri.parse('https://leancode.co'),
+          clientId: '',
+        ),
       );
       registerFallbackValue(MockClient());
       registerFallbackValue(Credentials(''));
@@ -42,6 +46,8 @@ void main() {
       oAuthSettings = MockOAuthSettings();
       when(() => oAuthSettings.clientId).thenReturn('client id');
       when(() => oAuthSettings.clientSecret).thenReturn('client secret');
+      when(() => oAuthSettings.authorizationUri)
+          .thenReturn(Uri.parse('https://leancode.co'));
       credentialsStorage = MockCredentialsStorage();
       logger = MockLogger();
       loginClient = LoginClient(
@@ -73,6 +79,37 @@ void main() {
       },
     );
 
+    test(
+      'initialize() reads from storage, tokenEndpoint has been replaced',
+      () async {
+        final credentials = Credentials(
+          'some token',
+          tokenEndpoint: Uri.parse('https://example.com'),
+        );
+
+        when(() => credentialsStorage.read())
+            .thenAnswer((_) async => credentials);
+
+        loginClient.onCredentialsChanged.listen(
+          expectAsync1((credentials) {
+            expect(
+              credentials?.tokenEndpoint,
+              Uri.parse('https://leancode.co'),
+            );
+          }),
+        );
+
+        await loginClient.initialize();
+
+        expect(loginClient.loggedIn, true);
+
+        verify(() => credentialsStorage.read()).called(1);
+        verify(() => oAuthSettings.authorizationUri).called(1);
+        verify(() => logger('Successfully initialized with credentials.'))
+            .called(1);
+      },
+    );
+
     test(
       'logIn() calls callbacks, saves credentials and logs on success',
       () async {