feat: add ComboSecurityScheme

lib/src/definitions/security/combo_security_scheme.dart

@@ -0,0 +1,46 @@
+// Copyright 2023 The NAMIB Project Developers. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+import 'package:curie/curie.dart';
+
+import '../extensions/json_parser.dart';
+import 'security_scheme.dart';
+
+const _schemeName = 'combo';
+
+/// A combination of other security schemes identified by the Vocabulary Term
+/// `combo` (i.e., "scheme": "combo").
+class ComboSecurityScheme extends SecurityScheme {
+  /// Constructor.
+  ComboSecurityScheme({
+    this.allOf,
+    this.oneOf,
+    super.description,
+    super.descriptions,
+    super.proxy,
+  }) : super(_schemeName);
+
+  /// Creates a [ComboSecurityScheme] from a [json] object.
+  ComboSecurityScheme.fromJson(
+    Map<String, dynamic> json,
+    PrefixMapping prefixMapping,
+    Set<String> parsedFields,
+  )   : oneOf = json.parseArrayField<String>('oneOf', parsedFields),
+        allOf = json.parseArrayField<String>('allOf', parsedFields),
+        super(_schemeName) {
+    parseSecurityJson(json, parsedFields, prefixMapping);
+  }
+
+  /// Array of two or more strings identifying other named security scheme
+  /// definitions, any one of which, when satisfied, will allow access.
+  ///
+  /// Only one may be chosen for use.
+  final List<String>? oneOf;
+
+  /// Array of two or more strings identifying other named security scheme
+  /// definitions, all of which must be satisfied for access.
+  final List<String>? allOf;
+}

lib/src/definitions/security/security_scheme.dart

@@ -12,6 +12,7 @@ import 'apikey_security_scheme.dart';
 import 'auto_security_scheme.dart';
 import 'basic_security_scheme.dart';
 import 'bearer_security_scheme.dart';
+import 'combo_security_scheme.dart';
 import 'digest_security_scheme.dart';
 import 'no_security_scheme.dart';
 import 'oauth2_security_scheme.dart';
@@ -84,6 +85,8 @@ abstract class SecurityScheme {
         return BasicSecurityScheme.fromJson(json, prefixMapping);
       case 'bearer':
         return BearerSecurityScheme.fromJson(json, prefixMapping);
+      case 'combo':
+        return ComboSecurityScheme.fromJson(json, prefixMapping, {});
       case 'nosec':
         return NoSecurityScheme.fromJson(json, prefixMapping);
       case 'psk':