[force-code-for-refresh-token-platform-interface] Address PR feedback

Author: fbcouch

packages/google_sign_in/google_sign_in_platform_interface/AUTHORS

@@ -64,3 +64,4 @@ Aleksandr Yurkovskiy <sanekyy@gmail.com>
 Anton Borries <mail@antonborri.es>
 Alex Li <google@alexv525.com>
 Rahul Raj <64.rahulraj@gmail.com>
+Twin Sun, LLC <google-contrib@twinsunsolutions.com>

packages/google_sign_in/google_sign_in_platform_interface/CHANGELOG.md

@@ -1,6 +1,6 @@
 ## 2.1.3
 
-* Add `SignInInitParameters` class to hold all sign in params, including the new `forceCodeForRefreshToken`.
+* Adds `SignInInitParameters` class to hold all sign in params, including the new `forceCodeForRefreshToken`.
 
 ## 2.1.2
 

packages/google_sign_in/google_sign_in_platform_interface/lib/google_sign_in_platform_interface.dart

@@ -86,14 +86,7 @@ abstract class GoogleSignInPlatform {
     String? hostedDomain,
     String? clientId,
   }) async {
-    await initWithParams(
-      SignInInitParameters(
-        scopes: scopes,
-        signInOption: signInOption,
-        hostedDomain: hostedDomain,
-        clientId: clientId,
-      ),
-    );
+    throw UnimplementedError('init() has not been implemented.');
   }
 
   /// Initializes the plugin. You must call this method before calling other
@@ -106,7 +99,12 @@ abstract class GoogleSignInPlatform {
   ///
   /// * [SignInInitParameters]
   Future<void> initWithParams(SignInInitParameters params) async {
-    throw UnimplementedError('initWithParams() has not been implemented');
+    await init(
+      scopes: params.scopes,
+      signInOption: params.signInOption,
+      hostedDomain: params.hostedDomain,
+      clientId: params.clientId,
+    );
   }
 
   /// Attempts to reuse pre-existing credentials to sign in again, without user interaction.

packages/google_sign_in/google_sign_in_platform_interface/lib/src/types.dart

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:flutter/widgets.dart';
 import 'package:quiver/core.dart';
 
 /// Default configuration options to use when signing in.
@@ -24,26 +25,12 @@ enum SignInOption {
 
 /// The parameters to use when initializing the sign in process.
 ///
-/// The [hostedDomain] argument specifies a hosted domain restriction. By
-/// setting this, sign in will be restricted to accounts of the user in the
-/// specified domain. By default, the list of accounts will not be restricted.
-///
-/// The list of [scopes] are OAuth scope codes to request when signing in.
-/// These scope codes will determine the level of data access that is granted
-/// to your application by the user. The full list of available scopes can be
-/// found here: <https://developers.google.com/identity/protocols/googlescopes>
-///
-/// The [signInOption] determines the user experience. [SigninOption.games] is
-/// only supported on Android.
-///
-/// The [forceCodeForRefreshToken] is used on Android to ensure the authentication
-/// code can be exchanged for a refresh token after the first request.
-///
 /// See:
 /// https://developers.google.com/identity/sign-in/web/reference#gapiauth2initparams
+@immutable
 class SignInInitParameters {
   /// The parameters to use when initializing the sign in process.
-  SignInInitParameters({
+  const SignInInitParameters({
     this.scopes = const <String>[],
     this.signInOption = SignInOption.standard,
     this.hostedDomain,
@@ -52,23 +39,24 @@ class SignInInitParameters {
   });
 
   /// The list of OAuth scope codes to request when signing in.
-  List<String> scopes;
+  final List<String> scopes;
 
   /// The user experience to use when signing in. [SignInOption.games] is
   /// only supported on Android.
-  SignInOption signInOption;
+  final SignInOption signInOption;
 
-  /// Restricted sign in to accounts of the user in the specified domain.
+  /// Restricts sign in to accounts of the user in the specified domain.
   /// By default, the list of accounts will not be restricted.
-  String? hostedDomain;
+  final String? hostedDomain;
 
   /// The client ID to use when signing in.
-  String? clientId;
+  final String? clientId;
 
-  /// Ensure the authorization code can be exchanged for an access token.
+  /// If true, ensures the authorization code can be exchanged for an access
+  /// token.
   ///
   /// This is only used on Android.
-  bool forceCodeForRefreshToken;
+  final bool forceCodeForRefreshToken;
 }
 
 /// Holds information about the signed in user.

packages/google_sign_in/google_sign_in_platform_interface/test/method_channel_google_sign_in_test.dart

@@ -140,7 +140,7 @@ void main() {
     });
 
     test('initWithParams passes through arguments to the channel', () async {
-      await googleSignIn.initWithParams(SignInInitParameters(
+      await googleSignIn.initWithParams(const SignInInitParameters(
           hostedDomain: 'example.com',
           scopes: <String>['two', 'scopes'],
           signInOption: SignInOption.games,