Oauth updates

lib/src/v3/api/api.dart

@@ -10,3 +10,4 @@ export 'resolve_object/resolve_object.dart';
 export 'search/search.dart';
 export 'site/site.dart';
 export 'user/user.dart';
+export 'oauth/oauth.dart';

lib/src/v3/api/oauth/oauth.dart

@@ -0,0 +1,26 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+import '../../../../v3.dart';
+import '../../../utils/serde.dart';
+
+part 'oauth.freezed.dart';
+part 'oauth.g.dart';
+
+/// Only available in lemmy v0.20.0 and above
+/// Authenticate with OAuth.
+///
+/// `HTTP.POST /oauth/authenticate`
+@freezed
+class AuthenticateWithOAuth with _$AuthenticateWithOAuth implements LemmyApiQuery<LoginResponse> {
+  @apiSerde
+  const factory AuthenticateWithOAuth({required String code, required int oauth_provider_id, required String redirect_uri, String? username, String? answer}) = _AuthenticateWithOAuth;
+
+  const AuthenticateWithOAuth._();
+  factory AuthenticateWithOAuth.fromJson(Map<String, dynamic> json) => _$AuthenticateWithOAuthFromJson(json);
+
+  final path = '/oauth/authenticate';
+  final httpMethod = HttpMethod.post;
+
+  @override
+  LoginResponse responseFactory(Map<String, dynamic> json) => LoginResponse.fromJson(json);
+}

lib/src/v3/models/local_user/local_user.dart

@@ -17,13 +17,15 @@ class LocalUser with _$LocalUser {
     bool? blurNsfw, // v0.18.3
     bool? autoExpand, // v0.18.3
     required String theme, // v0.18.0
-    required SortType defaultSortType, // v0.18.0
+    @deprecated SortType? defaultSortType, // v0.18.0 [deprecated in v0.20.0]
+    SortType? defaultCommentSortType, // v0.20.0
+    SortType? defaultPostSortType, // v0.20.0
     required ListingType defaultListingType, // v0.18.0
     required String interfaceLanguage, // v0.18.0
     required bool showAvatars, // v0.18.0
     required bool sendNotificationsToEmail, // v0.18.0
     @deprecated String? validatorTime, // v0.18.0 [deprecated in v0.19.0]
-    required bool showScores, // v0.18.0
+    @deprecated bool? showScores, // v0.18.0 [deprecated in v0.20.0]
     required bool showBotAccounts, // v0.18.0
     required bool showReadPosts, // v0.18.0
     @deprecated bool? showNewPostNotifs, // v0.18.0 [deprecated in v0.19.0]