simplify content negotiation scaffolding with an interface

Author: Fresa

src/OpenAPI.WebApiGenerator/CodeGeneration/RequestGenerator.cs

@@ -79,10 +79,9 @@ internal partial class Request
     /// <param name="mediaTypes">Media types to match against</param>
     /// <param name="matchedMediaType">Matched media type if method returns true</param>
     /// <returns>True if a matched media type was found</returns>
-    internal bool TryMatchAcceptMediaType(
-        MediaTypeHeaderValue[] mediaTypes, 
-        [NotNullWhen(true)] out MediaTypeHeaderValue? matchedMediaType) =>
-        HttpContext.Request.TryMatchAcceptMediaType(mediaTypes, out matchedMediaType);
+    internal bool TryMatchAcceptMediaType<T>(
+        [NotNullWhen(true)] out MediaTypeHeaderValue? matchedMediaType) where T : class, IResponse =>
+        HttpContext.Request.TryMatchAcceptMediaType(T.ContentMediaTypes, out matchedMediaType);
     
     /// <summary>
     /// Validate the request

src/OpenAPI.WebApiGenerator/CodeGeneration/ResponseContentGenerator.cs

@@ -62,7 +62,7 @@ public string GenerateResponseContentClass()
         return 
 $$$"""
 {{{_response.Description.AsComment("summary", "para")}}}
-internal {{{(_contentGenerators.Any() ? "abstract" : "sealed")}}} class {{{_responseClassName}}} : Response
+internal {{{(_contentGenerators.Any() ? "abstract" : "sealed")}}} class {{{_responseClassName}}} : Response{{{(_contentGenerators.Any() ? ", IResponse" : "")}}}
 {
     private string? {{{contentTypeFieldName}}} = null;{{{
     _contentGenerators.AggregateToString(generator =>
@@ -74,10 +74,8 @@ public string GenerateResponseContentClass()
     protected abstract IJsonValue Content { get; }
     protected abstract string ContentSchemaLocation { get; }
       
-    /// <summary>
-    /// Content media types
-    /// </summary>
-    internal static readonly MediaTypeHeaderValue[] ContentMediaTypes = 
+    /// <inheritdoc/>
+    public static MediaTypeHeaderValue[] ContentMediaTypes { get; } = 
     [{{_contentGenerators.AggregateToString(generator => 
 $$"""
         {{generator.ClassName}}.ContentMediaType,

src/OpenAPI.WebApiGenerator/CodeGeneration/ResponseGenerator.cs

@@ -67,6 +67,14 @@ protected void EnsureExpectedContentType(MediaTypeHeaderValue contentType, Media
         generator.GenerateResponseContentClass()).Indent(4)
     }}
 }
+
+internal interface IResponse 
+{
+    /// <summary>
+    /// Content media types
+    /// </summary>
+    internal static abstract MediaTypeHeaderValue[] ContentMediaTypes { get; }
+}
 #nullable restore
 """);
     }

tests/Example.OpenApi20/Paths/FooFooId/Put/Operation.Handler.cs

@@ -35,7 +35,7 @@ internal partial Task<Response> HandleAsync(Request request, CancellationToken c
         _ = request.Path.FooId;
         _ = request.Header.Bar;
 
-        switch (request.TryMatchAcceptMediaType(Response.OK200.ContentMediaTypes, out var matchedMediaType))
+        switch (request.TryMatchAcceptMediaType<Response.OK200>(out var matchedMediaType))
         {
             case false:
             case true when ReferenceEquals(matchedMediaType, Response.OK200.ApplicationJson.ContentMediaType):

tests/Example.OpenApi30/Paths/FooFooId/Put/Operation.Handler.cs

@@ -34,7 +34,7 @@ internal partial Task<Response> HandleAsync(Request request, CancellationToken c
         _ = request.Path.FooId;
         _ = request.Header.Bar;
 
-        switch (request.TryMatchAcceptMediaType(Response.OK200.ContentMediaTypes, out var matchedMediaType))
+        switch (request.TryMatchAcceptMediaType<Response.OK200>(out var matchedMediaType))
         {
             case false:
             case true when ReferenceEquals(matchedMediaType, Response.OK200.ApplicationJson.ContentMediaType):

tests/Example.OpenApi31/Paths/FooFooId/Put/Operation.Handler.cs

@@ -33,7 +33,7 @@ internal partial Task<Response> HandleAsync(Request request, CancellationToken c
         _ = request.Path.FooId;
         _ = request.Header.Bar;
 
-        switch (request.TryMatchAcceptMediaType(Response.OK200.ContentMediaTypes, out var matchedMediaType))
+        switch (request.TryMatchAcceptMediaType<Response.OK200>(out var matchedMediaType))
         {
             case false:
             case true when ReferenceEquals(matchedMediaType, Response.OK200.ApplicationJson.ContentMediaType):

tests/Example.OpenApi32/Paths/FooFooId/Put/Operation.Handler.cs

@@ -32,7 +32,7 @@ internal partial Task<Response> HandleAsync(Request request, CancellationToken c
         _ = request.Query.Fee;
         _ = request.Path.FooId;
 
-        switch (request.TryMatchAcceptMediaType(Response.OK200.ContentMediaTypes, out var matchedMediaType))
+        switch (request.TryMatchAcceptMediaType<Response.OK200>(out var matchedMediaType))
         {
             case false:
             case true when ReferenceEquals(matchedMediaType, Response.OK200.AnyApplication.ContentMediaType):