Fix Deep copying of objects implementing the dictionary type using copy constructors

src/Microsoft.OpenApi/Helpers/DictionaryCloneHelper.cs

@@ -0,0 +1,36 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+
+using System;
+using System.Collections.Generic;
+
+namespace Microsoft.OpenApi.Helpers
+{
+    /// <summary>
+    /// Helper class for deep cloning dictionaries.
+    /// </summary>
+    internal class DictionaryCloneHelper
+    {
+        /// <summary>
+        /// Deep clone key value pairs in a dictionary.
+        /// </summary>
+        /// <typeparam name="T">The type of the key of the dictionary.</typeparam>
+        /// <typeparam name="U">The type of the value of the dictionary.</typeparam>
+        /// <param name="dictionary">The target dictionary to clone.</param>
+        /// <returns>The cloned dictionary.</returns>
+        internal static Dictionary<T, U> Clone<T, U>(IDictionary<T, U> dictionary)
+        {            
+            if (dictionary is null) return null;
+            var clonedDictionary = new Dictionary<T, U>(dictionary.Keys.Count);
+
+            foreach (var kvp in dictionary)
+            {
+                // Create instance of the specified type using the constructor matching the specified parameter types.
+                clonedDictionary[kvp.Key] = (U)Activator.CreateInstance(kvp.Value.GetType(), kvp.Value);
+            }
+
+
+            return clonedDictionary;
+        }
+    }
+}

src/Microsoft.OpenApi/Models/OpenApiCallback.cs

@@ -4,6 +4,7 @@
 using System.Collections.Generic;
 using Microsoft.OpenApi.Any;
 using Microsoft.OpenApi.Expressions;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 

src/Microsoft.OpenApi/Models/OpenApiComponents.cs

@@ -1,10 +1,9 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license. 
 
-using System;
 using System.Collections.Generic;
 using System.Linq;
-using Microsoft.OpenApi.Any;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 
@@ -78,15 +77,15 @@ public OpenApiComponents() { }
         /// </summary>
         public OpenApiComponents(OpenApiComponents components)
         {
-            Schemas = components?.Schemas != null ? new Dictionary<string, OpenApiSchema>(components.Schemas) : null;
-            Responses = components?.Responses != null ? new Dictionary<string, OpenApiResponse>(components.Responses) : null;
-            Parameters = components?.Parameters != null ? new Dictionary<string, OpenApiParameter>(components.Parameters) : null;
-            Examples = components?.Examples != null ? new Dictionary<string, OpenApiExample>(components.Examples) : null;
-            RequestBodies = components?.RequestBodies != null ? new Dictionary<string, OpenApiRequestBody>(components.RequestBodies) : null;
-            Headers = components?.Headers != null ? new Dictionary<string, OpenApiHeader>(components.Headers) : null;
-            SecuritySchemes = components?.SecuritySchemes != null ? new Dictionary<string, OpenApiSecurityScheme>(components.SecuritySchemes) : null;
-            Links = components?.Links != null ? new Dictionary<string, OpenApiLink>(components.Links) : null;
-            Callbacks = components?.Callbacks != null ? new Dictionary<string, OpenApiCallback>(components.Callbacks) : null;
+            Schemas = DictionaryCloneHelper.Clone(components?.Schemas);
+            Responses = DictionaryCloneHelper.Clone(components?.Responses);
+            Parameters = DictionaryCloneHelper.Clone(components?.Parameters);
+            Examples = DictionaryCloneHelper.Clone(components?.Examples);
+            RequestBodies = DictionaryCloneHelper.Clone(components?.RequestBodies);
+            Headers = DictionaryCloneHelper.Clone(components?.Headers);
+            SecuritySchemes = DictionaryCloneHelper.Clone(components?.SecuritySchemes);
+            Links = DictionaryCloneHelper.Clone(components?.Links);
+            Callbacks = DictionaryCloneHelper.Clone(components?.Callbacks);
             Extensions = components?.Extensions != null ? new Dictionary<string, IOpenApiExtension>(components.Extensions) : null;
         }
 

src/Microsoft.OpenApi/Models/OpenApiDocument.cs

@@ -8,6 +8,7 @@
 using System.Security.Cryptography;
 using System.Text;
 using Microsoft.OpenApi.Exceptions;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Services;
 using Microsoft.OpenApi.Writers;

src/Microsoft.OpenApi/Models/OpenApiEncoding.cs

@@ -4,6 +4,7 @@
 using System.Collections.Generic;
 using Microsoft.OpenApi.Any;
 using Microsoft.OpenApi.Extensions;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 
@@ -64,7 +65,7 @@ public OpenApiEncoding() {}
         public OpenApiEncoding(OpenApiEncoding encoding)
         {
             ContentType = encoding?.ContentType ?? ContentType;
-            Headers = encoding?.Headers != null ? new Dictionary<string, OpenApiHeader>(encoding.Headers) : null;
+            Headers = DictionaryCloneHelper.Clone(encoding?.Headers);
             Style = encoding?.Style ?? Style;
             Explode = encoding?.Explode ?? Explode;
             AllowReserved = encoding?.AllowReserved ?? AllowReserved;

src/Microsoft.OpenApi/Models/OpenApiExample.cs

@@ -3,6 +3,7 @@
 
 using System.Collections.Generic;
 using Microsoft.OpenApi.Any;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 

src/Microsoft.OpenApi/Models/OpenApiHeader.cs

@@ -4,6 +4,7 @@
 using System.Collections.Generic;
 using Microsoft.OpenApi.Any;
 using Microsoft.OpenApi.Extensions;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 
@@ -107,8 +108,8 @@ public OpenApiHeader(OpenApiHeader header)
             AllowReserved = header?.AllowReserved ?? AllowReserved;
             Schema = header?.Schema != null ? new(header?.Schema) : null;
             Example = OpenApiAnyCloneHelper.CloneFromCopyConstructor(header?.Example);
-            Examples = header?.Examples != null ? new Dictionary<string, OpenApiExample>(header.Examples) : null;
-            Content = header?.Content != null ? new Dictionary<string, OpenApiMediaType>(header.Content) : null;
+            Examples = DictionaryCloneHelper.Clone(header?.Examples);
+            Content = DictionaryCloneHelper.Clone(header?.Content);
             Extensions = header?.Extensions != null ? new Dictionary<string, IOpenApiExtension>(header.Extensions) : null;
         }
 

src/Microsoft.OpenApi/Models/OpenApiMediaType.cs

@@ -3,6 +3,7 @@
 
 using System.Collections.Generic;
 using Microsoft.OpenApi.Any;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 
@@ -55,8 +56,8 @@ public OpenApiMediaType(OpenApiMediaType mediaType)
         {
             Schema = mediaType?.Schema != null ? new(mediaType?.Schema) : null;
             Example = OpenApiAnyCloneHelper.CloneFromCopyConstructor(mediaType?.Example);
-            Examples = mediaType?.Examples != null ? new Dictionary<string, OpenApiExample>(mediaType.Examples) : null;
-            Encoding = mediaType?.Encoding != null ? new Dictionary<string, OpenApiEncoding>(mediaType.Encoding) : null;
+            Examples = DictionaryCloneHelper.Clone(mediaType?.Examples);
+            Encoding = DictionaryCloneHelper.Clone(mediaType?.Encoding);
             Extensions = mediaType?.Extensions != null ? new Dictionary<string, IOpenApiExtension>(mediaType.Extensions) : null;
         }
 

src/Microsoft.OpenApi/Models/OpenApiOperation.cs

@@ -5,6 +5,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.OpenApi.Any;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 
@@ -124,7 +125,7 @@ public OpenApiOperation(OpenApiOperation operation)
             Parameters = operation?.Parameters != null ? new List<OpenApiParameter>(operation.Parameters) : null;
             RequestBody = new(operation?.RequestBody);
             Responses = operation?.Responses != null ? new(operation?.Responses) : null;
-            Callbacks = operation?.Callbacks != null ? new Dictionary<string, OpenApiCallback>(operation.Callbacks) : null;
+            Callbacks = DictionaryCloneHelper.Clone(operation?.Callbacks);
             Deprecated = operation?.Deprecated ?? Deprecated;
             Security = operation?.Security != null ? new List<OpenApiSecurityRequirement>(operation.Security) : null;
             Servers = operation?.Servers != null ? new List<OpenApiServer>(operation.Servers) : null;

src/Microsoft.OpenApi/Models/OpenApiParameter.cs

@@ -6,6 +6,7 @@
 using System.Runtime;
 using Microsoft.OpenApi.Any;
 using Microsoft.OpenApi.Extensions;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 
@@ -162,9 +163,9 @@ public OpenApiParameter(OpenApiParameter parameter)
             Explode = parameter?.Explode ?? Explode;
             AllowReserved = parameter?.AllowReserved ?? AllowReserved;
             Schema = parameter?.Schema != null ? new(parameter?.Schema) : null;
-            Examples = parameter?.Examples != null ? new Dictionary<string, OpenApiExample>(parameter.Examples) : null;
+            Examples = DictionaryCloneHelper.Clone(parameter?.Examples);
             Example = OpenApiAnyCloneHelper.CloneFromCopyConstructor(parameter?.Example);
-            Content = parameter?.Content != null ? new Dictionary<string, OpenApiMediaType>(parameter.Content) : null;
+            Content = DictionaryCloneHelper.Clone(parameter?.Content);
             Extensions = parameter?.Extensions != null ? new Dictionary<string, IOpenApiExtension>(parameter.Extensions) : null;
             AllowEmptyValue = parameter?.AllowEmptyValue ?? AllowEmptyValue;
             Deprecated = parameter?.Deprecated ?? Deprecated;

src/Microsoft.OpenApi/Models/OpenApiPathItem.cs

@@ -1,8 +1,10 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license. 
 
+using System;
 using System.Collections.Generic;
 using Microsoft.OpenApi.Extensions;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 
@@ -77,7 +79,7 @@ public OpenApiPathItem(OpenApiPathItem pathItem)
         {
             Summary = pathItem?.Summary ?? Summary;
             Description = pathItem?.Description ?? Description;
-            Operations = pathItem?.Operations != null ? new Dictionary<OperationType, OpenApiOperation>(pathItem.Operations) : null;
+            Operations = DictionaryCloneHelper.Clone(pathItem?.Operations);
             Servers = pathItem?.Servers != null ? new List<OpenApiServer>(pathItem.Servers) : null;
             Parameters = pathItem?.Parameters != null ? new List<OpenApiParameter>(pathItem.Parameters) : null;
             Extensions = pathItem?.Extensions != null ? new Dictionary<string, IOpenApiExtension>(pathItem.Extensions) : null;

src/Microsoft.OpenApi/Models/OpenApiPaths.cs

@@ -1,6 +1,11 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license. 
 
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using Microsoft.OpenApi.Helpers;
+
 namespace Microsoft.OpenApi.Models
 {
     /// <summary>
@@ -17,6 +22,6 @@ public OpenApiPaths() {}
         /// Initializes a copy of <see cref="OpenApiPaths"/> object
         /// </summary>
         /// <param name="paths">The <see cref="OpenApiPaths"/>.</param>
-        public OpenApiPaths(OpenApiPaths paths) : base(dictionary: paths) {}
+        public OpenApiPaths(OpenApiPaths paths) : base(DictionaryCloneHelper.Clone(paths)) { }             
     }
 }

src/Microsoft.OpenApi/Models/OpenApiRequestBody.cs

@@ -5,6 +5,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.OpenApi.Any;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 
@@ -61,7 +62,7 @@ public OpenApiRequestBody(OpenApiRequestBody requestBody)
             Reference = requestBody?.Reference != null ? new(requestBody?.Reference) : null;
             Description = requestBody?.Description ?? Description;
             Required = requestBody?.Required ?? Required;
-            Content = requestBody?.Content != null ? new Dictionary<string, OpenApiMediaType>(requestBody.Content) : null;
+            Content = DictionaryCloneHelper.Clone(requestBody?.Content);
             Extensions = requestBody?.Extensions != null ? new Dictionary<string, IOpenApiExtension>(requestBody.Extensions) : null;
         }
 

src/Microsoft.OpenApi/Models/OpenApiResponse.cs

@@ -3,6 +3,7 @@
 
 using System.Collections.Generic;
 using System.Linq;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 
@@ -62,9 +63,9 @@ public OpenApiResponse() {}
         public OpenApiResponse(OpenApiResponse response)
         {
             Description = response?.Description ?? Description;
-            Headers = response?.Headers != null ? new Dictionary<string, OpenApiHeader>(response.Headers) : null;
-            Content = response?.Content != null ? new Dictionary<string, OpenApiMediaType>(response.Content) : null;
-            Links = response?.Links != null ? new Dictionary<string, OpenApiLink>(response.Links) : null;
+            Headers = DictionaryCloneHelper.Clone(response?.Headers);
+            Content = DictionaryCloneHelper.Clone(response?.Content);
+            Links = DictionaryCloneHelper.Clone(response?.Links);
             Extensions = response?.Extensions != null ? new Dictionary<string, IOpenApiExtension>(response.Extensions) : null;
             UnresolvedReference = response?.UnresolvedReference ?? UnresolvedReference;
             Reference = response?.Reference != null ? new(response?.Reference) : null;

src/Microsoft.OpenApi/Models/OpenApiResponses.cs

@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license. 
 
+using Microsoft.OpenApi.Helpers;
+
 namespace Microsoft.OpenApi.Models
 {
     /// <summary>
@@ -17,6 +19,6 @@ public OpenApiResponses() { }
         /// Initializes a copy of <see cref="OpenApiResponses"/> object
         /// </summary>
         /// <param name="openApiResponses">The <see cref="OpenApiResponses"/></param>
-        public OpenApiResponses(OpenApiResponses openApiResponses) : base(dictionary: openApiResponses) {}
+        public OpenApiResponses(OpenApiResponses openApiResponses) : base(DictionaryCloneHelper.Clone(openApiResponses)) {}
     }
 }

src/Microsoft.OpenApi/Models/OpenApiSchema.cs

@@ -4,6 +4,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.OpenApi.Any;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 
@@ -276,7 +277,7 @@ public OpenApiSchema(OpenApiSchema schema)
             MaxItems = schema?.MaxItems ?? MaxItems;
             MinItems = schema?.MinItems ?? MinItems;
             UniqueItems = schema?.UniqueItems ?? UniqueItems;
-            Properties = schema?.Properties != null ? new Dictionary<string, OpenApiSchema>(schema.Properties) : null;
+            Properties = DictionaryCloneHelper.Clone(schema?.Properties);
             MaxProperties = schema?.MaxProperties ?? MaxProperties;
             MinProperties = schema?.MinProperties ?? MinProperties;
             AdditionalPropertiesAllowed = schema?.AdditionalPropertiesAllowed ?? AdditionalPropertiesAllowed;

src/Microsoft.OpenApi/Models/OpenApiServer.cs

@@ -3,6 +3,7 @@
 
 using System.Collections.Generic;
 using Microsoft.OpenApi.Any;
+using Microsoft.OpenApi.Helpers;
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Writers;
 
@@ -48,7 +49,7 @@ public OpenApiServer(OpenApiServer server)
         {
             Description = server?.Description ?? Description;
             Url = server?.Url ?? Url;
-            Variables = server?.Variables != null ? new Dictionary<string, OpenApiServerVariable>(server.Variables) : null;
+            Variables = DictionaryCloneHelper.Clone(server?.Variables);
             Extensions = server?.Extensions != null ? new Dictionary<string, IOpenApiExtension>(server.Extensions) : null;
         }
 

test/Microsoft.OpenApi.Tests/Models/OpenApiDocumentTests.cs

@@ -12,6 +12,7 @@
 using Microsoft.OpenApi.Interfaces;
 using Microsoft.OpenApi.Models;
 using Microsoft.OpenApi.Readers;
+using Microsoft.OpenApi.Services;
 using Microsoft.OpenApi.Writers;
 using VerifyXunit;
 using Xunit;
@@ -1344,12 +1345,19 @@ public void CopyConstructorForAdvancedDocumentWorks()
             // Arrange & Act
             var doc = new OpenApiDocument(AdvancedDocument);
 
+            var docOpId = doc.Paths["/pets"].Operations[OperationType.Get].OperationId = "findAllMyPets";
+            var advancedDocOpId = AdvancedDocument.Paths["/pets"].Operations[OperationType.Get].OperationId;
+            var responseSchemaTypeCopy = doc.Paths["/pets"].Operations[OperationType.Get].Responses["200"].Content["application/json"].Schema.Type = "object";
+            var advancedDocResponseSchemaType = AdvancedDocument.Paths["/pets"].Operations[OperationType.Get].Responses["200"].Content["application/json"].Schema.Type;
+
             // Assert
             Assert.NotNull(doc.Info);
             Assert.NotNull(doc.Servers);
             Assert.NotNull(doc.Paths);
             Assert.Equal(2, doc.Paths.Count);
             Assert.NotNull(doc.Components);
+            Assert.NotEqual(docOpId, advancedDocOpId);
+            Assert.NotEqual(responseSchemaTypeCopy, advancedDocResponseSchemaType);
         }
 
         [Fact]