fix/request body reference

src/Microsoft.OpenApi.Hidi/StatsVisitor.cs

@@ -41,7 +41,7 @@ public override void Visit(IOpenApiPathItem pathItem)
 
         public int RequestBodyCount { get; set; }
 
-        public override void Visit(OpenApiRequestBody requestBody)
+        public override void Visit(IOpenApiRequestBody requestBody)
         {
             RequestBodyCount++;
         }

src/Microsoft.OpenApi.Workbench/StatsVisitor.cs

@@ -41,7 +41,7 @@ public override void Visit(IOpenApiPathItem pathItem)
 
         public int RequestBodyCount { get; set; }
 
-        public override void Visit(OpenApiRequestBody requestBody)
+        public override void Visit(IOpenApiRequestBody requestBody)
         {
             RequestBodyCount++;
         }

src/Microsoft.OpenApi/Models/Interfaces/IOpenApiRequestBody.cs

@@ -0,0 +1,35 @@
+using System.Collections.Generic;
+using Microsoft.OpenApi.Interfaces;
+using Microsoft.OpenApi.Writers;
+
+namespace Microsoft.OpenApi.Models.Interfaces;
+
+/// <summary>
+/// Defines the base properties for the request body object.
+/// This interface is provided for type assertions but should not be implemented by package consumers beyond automatic mocking.
+/// </summary>
+public interface IOpenApiRequestBody : IOpenApiDescribedElement, IOpenApiSerializable, IOpenApiReadOnlyExtensible
+{
+    /// <summary>
+    /// Determines if the request body is required in the request. Defaults to false.
+    /// </summary>
+    public bool Required { get; }
+
+    /// <summary>
+    /// REQUIRED. The content of the request body. The key is a media type or media type range and the value describes it.
+    /// For requests that match multiple keys, only the most specific key is applicable. e.g. text/plain overrides text/*
+    /// </summary>
+    public IDictionary<string, OpenApiMediaType> Content { get; }
+    /// <summary>
+    /// Converts the request body to a body parameter in preparation for a v2 serialization.
+    /// </summary>
+    /// <param name="writer">The writer to use to read settings from.</param>
+    /// <returns>The converted OpenAPI parameter</returns>
+    IOpenApiParameter ConvertToBodyParameter(IOpenApiWriter writer);
+    /// <summary>
+    /// Converts the request body to a set of form data parameters in preparation for a v2 serialization.
+    /// </summary>
+    /// <param name="writer">The writer to use to read settings from</param>
+    /// <returns>The converted OpenAPI parameters</returns>
+    IEnumerable<IOpenApiParameter> ConvertToFormDataParameters(IOpenApiWriter writer);
+}

src/Microsoft.OpenApi/Models/OpenApiComponents.cs

@@ -39,10 +39,10 @@ public class OpenApiComponents : IOpenApiSerializable, IOpenApiExtensible
         public IDictionary<string, IOpenApiExample>? Examples { get; set; } = new Dictionary<string, IOpenApiExample>();
 
         /// <summary>
-        /// An object to hold reusable <see cref="OpenApiRequestBody"/> Objects.
+        /// An object to hold reusable <see cref="IOpenApiRequestBody"/> Objects.
         /// </summary>
-        public IDictionary<string, OpenApiRequestBody>? RequestBodies { get; set; } =
-            new Dictionary<string, OpenApiRequestBody>();
+        public IDictionary<string, IOpenApiRequestBody>? RequestBodies { get; set; } =
+            new Dictionary<string, IOpenApiRequestBody>();
 
         /// <summary>
         /// An object to hold reusable <see cref="IOpenApiHeader"/> Objects.
@@ -89,7 +89,7 @@ public OpenApiComponents(OpenApiComponents? components)
             Responses = components?.Responses != null ? new Dictionary<string, OpenApiResponse>(components.Responses) : null;
             Parameters = components?.Parameters != null ? new Dictionary<string, IOpenApiParameter>(components.Parameters) : null;
             Examples = components?.Examples != null ? new Dictionary<string, IOpenApiExample>(components.Examples) : null;
-            RequestBodies = components?.RequestBodies != null ? new Dictionary<string, OpenApiRequestBody>(components.RequestBodies) : null;
+            RequestBodies = components?.RequestBodies != null ? new Dictionary<string, IOpenApiRequestBody>(components.RequestBodies) : null;
             Headers = components?.Headers != null ? new Dictionary<string, IOpenApiHeader>(components.Headers) : null;
             SecuritySchemes = components?.SecuritySchemes != null ? new Dictionary<string, OpenApiSecurityScheme>(components.SecuritySchemes) : null;
             Links = components?.Links != null ? new Dictionary<string, IOpenApiLink>(components.Links) : null;

src/Microsoft.OpenApi/Models/OpenApiDocument.cs

@@ -600,7 +600,7 @@ public bool AddComponent<T>(string id, T componentToRegister)
                     Components.Responses.Add(id, openApiResponse);
                     break;
                 case OpenApiRequestBody openApiRequestBody:
-                    Components.RequestBodies ??= new Dictionary<string, OpenApiRequestBody>();
+                    Components.RequestBodies ??= new Dictionary<string, IOpenApiRequestBody>();
                     Components.RequestBodies.Add(id, openApiRequestBody);
                     break;
                 case OpenApiLink openApiLink:

src/Microsoft.OpenApi/Models/OpenApiOperation.cs

@@ -66,7 +66,7 @@ public class OpenApiOperation : IOpenApiSerializable, IOpenApiExtensible, IOpenA
         /// has explicitly defined semantics for request bodies.
         /// In other cases where the HTTP spec is vague, requestBody SHALL be ignored by consumers.
         /// </summary>
-        public OpenApiRequestBody? RequestBody { get; set; }
+        public IOpenApiRequestBody? RequestBody { get; set; }
 
         /// <summary>
         /// REQUIRED. The list of possible responses as they are returned from executing this operation.
@@ -128,7 +128,7 @@ public OpenApiOperation(OpenApiOperation? operation)
             ExternalDocs = operation?.ExternalDocs != null ? new(operation?.ExternalDocs) : null;
             OperationId = operation?.OperationId ?? OperationId;
             Parameters = operation?.Parameters != null ? new List<IOpenApiParameter>(operation.Parameters) : null;
-            RequestBody = operation?.RequestBody != null ? new(operation?.RequestBody) : null;
+            RequestBody = operation?.RequestBody != null ? new OpenApiRequestBody(operation?.RequestBody) : null;
             Responses = operation?.Responses != null ? new(operation?.Responses) : null;
             Callbacks = operation?.Callbacks != null ? new Dictionary<string, IOpenApiCallback>(operation.Callbacks) : null;
             Deprecated = operation?.Deprecated ?? Deprecated;
@@ -235,15 +235,7 @@ public void SerializeAsV2(IOpenApiWriter writer)
             // operationId
             writer.WriteProperty(OpenApiConstants.OperationId, OperationId);
 
-            List<IOpenApiParameter> parameters;
-            if (Parameters == null)
-            {
-                parameters = [];
-            }
-            else
-            {
-                parameters = [.. Parameters];
-            }
+            List<IOpenApiParameter> parameters = Parameters is null ? new() : new(Parameters);
 
             if (RequestBody != null)
             {
@@ -255,17 +247,17 @@ public void SerializeAsV2(IOpenApiWriter writer)
                     if (consumes.Contains("application/x-www-form-urlencoded") ||
                         consumes.Contains("multipart/form-data"))
                     {
-                        parameters.AddRange(RequestBody.ConvertToFormDataParameters());
+                        parameters.AddRange(RequestBody.ConvertToFormDataParameters(writer));
                     }
                     else
                     {
                         parameters.Add(RequestBody.ConvertToBodyParameter(writer));
                     }
                 }
-                else if (RequestBody.Reference != null && RequestBody.Reference.HostDocument is {} hostDocument)
+                else if (RequestBody is OpenApiRequestBodyReference requestBodyReference)
                 {
                     parameters.Add(
-                        new OpenApiParameterReference(RequestBody.Reference.Id, hostDocument));
+                        new OpenApiParameterReference(requestBodyReference.Reference.Id, requestBodyReference.Reference.HostDocument));
                 }
 
                 if (consumes.Count > 0)

src/Microsoft.OpenApi/Models/OpenApiRequestBody.cs

@@ -15,52 +15,31 @@ namespace Microsoft.OpenApi.Models
     /// <summary>
     /// Request Body Object
     /// </summary>
-    public class OpenApiRequestBody : IOpenApiReferenceable, IOpenApiExtensible
+    public class OpenApiRequestBody : IOpenApiReferenceable, IOpenApiExtensible, IOpenApiRequestBody
     {
-        /// <summary>
-        /// Indicates if object is populated with data or is just a reference to the data
-        /// </summary>
-        public bool UnresolvedReference { get; set; }
-
-        /// <summary>
-        /// Reference object.
-        /// </summary>
-        public OpenApiReference Reference { get; set; }
-
-        /// <summary>
-        /// A brief description of the request body. This could contain examples of use.
-        /// CommonMark syntax MAY be used for rich text representation.
-        /// </summary>
-        public virtual string Description { get; set; }
+        /// <inheritdoc />
+        public string Description { get; set; }
 
-        /// <summary>
-        /// Determines if the request body is required in the request. Defaults to false.
-        /// </summary>
-        public virtual bool Required { get; set; }
+        /// <inheritdoc />
+        public bool Required { get; set; }
 
-        /// <summary>
-        /// REQUIRED. The content of the request body. The key is a media type or media type range and the value describes it.
-        /// For requests that match multiple keys, only the most specific key is applicable. e.g. text/plain overrides text/*
-        /// </summary>
-        public virtual IDictionary<string, OpenApiMediaType> Content { get; set; } = new Dictionary<string, OpenApiMediaType>();
+        /// <inheritdoc />
+        public IDictionary<string, OpenApiMediaType> Content { get; set; } = new Dictionary<string, OpenApiMediaType>();
 
-        /// <summary>
-        /// This object MAY be extended with Specification Extensions.
-        /// </summary>
-        public virtual IDictionary<string, IOpenApiExtension> Extensions { get; set; } = new Dictionary<string, IOpenApiExtension>();
+        /// <inheritdoc />
+        public IDictionary<string, IOpenApiExtension> Extensions { get; set; } = new Dictionary<string, IOpenApiExtension>();
 
         /// <summary>
         /// Parameter-less constructor
         /// </summary>
         public OpenApiRequestBody() { }
 
         /// <summary>
-        /// Initializes a copy instance of an <see cref="OpenApiRequestBody"/> object
+        /// Initializes a copy instance of an <see cref="IOpenApiRequestBody"/> object
         /// </summary>
-        public OpenApiRequestBody(OpenApiRequestBody requestBody)
+        public OpenApiRequestBody(IOpenApiRequestBody requestBody)
         {
-            UnresolvedReference = requestBody?.UnresolvedReference ?? UnresolvedReference;
-            Reference = requestBody?.Reference != null ? new(requestBody?.Reference) : null;
+            Utils.CheckArgumentNull(requestBody);
             Description = requestBody?.Description ?? Description;
             Required = requestBody?.Required ?? Required;
             Content = requestBody?.Content != null ? new Dictionary<string, OpenApiMediaType>(requestBody.Content) : null;
@@ -70,20 +49,20 @@ public OpenApiRequestBody(OpenApiRequestBody requestBody)
         /// <summary>
         /// Serialize <see cref="OpenApiRequestBody"/> to Open Api v3.1
         /// </summary>
-        public virtual void SerializeAsV31(IOpenApiWriter writer)
+        public void SerializeAsV31(IOpenApiWriter writer)
         {
             SerializeInternal(writer, OpenApiSpecVersion.OpenApi3_1, (writer, element) => element.SerializeAsV31(writer));
         }
 
         /// <summary>
         /// Serialize <see cref="OpenApiRequestBody"/> to Open Api v3.0
         /// </summary>
-        public virtual void SerializeAsV3(IOpenApiWriter writer)
+        public void SerializeAsV3(IOpenApiWriter writer)
         {
             SerializeInternal(writer, OpenApiSpecVersion.OpenApi3_0, (writer, element) => element.SerializeAsV3(writer));
         }
 
-        internal virtual void SerializeInternal(IOpenApiWriter writer, OpenApiSpecVersion version,
+        internal void SerializeInternal(IOpenApiWriter writer, OpenApiSpecVersion version,
             Action<IOpenApiWriter, IOpenApiSerializable> callback)
         {
             Utils.CheckArgumentNull(writer);
@@ -113,7 +92,8 @@ public void SerializeAsV2(IOpenApiWriter writer)
             // RequestBody object does not exist in V2.
         }
 
-        internal virtual IOpenApiParameter ConvertToBodyParameter(IOpenApiWriter writer)
+        /// <inheritdoc/>
+        public IOpenApiParameter ConvertToBodyParameter(IOpenApiWriter writer)
         {
             var bodyParameter = new OpenApiBodyParameter
             {
@@ -135,22 +115,23 @@ internal virtual IOpenApiParameter ConvertToBodyParameter(IOpenApiWriter writer)
             return bodyParameter;
         }
 
-        internal IEnumerable<OpenApiFormDataParameter> ConvertToFormDataParameters()
+        /// <inheritdoc/>
+        public IEnumerable<IOpenApiParameter> ConvertToFormDataParameters(IOpenApiWriter writer)
         {
             if (Content == null || !Content.Any())
                 yield break;
 
             foreach (var property in Content.First().Value.Schema.Properties)
             {
                 var paramSchema = property.Value;
-                if ("string".Equals(paramSchema.Type.ToIdentifier(), StringComparison.OrdinalIgnoreCase)
+                if ((paramSchema.Type & JsonSchemaType.String) == JsonSchemaType.String
                     && ("binary".Equals(paramSchema.Format, StringComparison.OrdinalIgnoreCase)
                     || "base64".Equals(paramSchema.Format, StringComparison.OrdinalIgnoreCase)))
                 {
                     paramSchema.Type = "file".ToJsonSchemaType();
                     paramSchema.Format = null;
                 }
-                yield return new()
+                yield return new OpenApiFormDataParameter()
                 {
                     Description = property.Value.Description,
                     Name = property.Key,