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Fix wrong swagger schema generation when response_body is set. #459

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Fix wrong swagger schema generation when response_body is set. #459

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32 changes: 31 additions & 1 deletion ...cHttpApi/src/Microsoft.AspNetCore.Grpc.Swagger/Internal/GrpcHttpApiDescriptionProvider.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -72,10 +72,40 @@ private static ApiDescription CreateApiDescription(RouteEndpoint routeEndpoint,
};
apiDescription.RelativePath = pattern.TrimStart('/');
apiDescription.SupportedRequestFormats.Add(new ApiRequestFormat { MediaType = "application/json" });

var modelMetadata = new GrpcModelMetadata(ModelMetadataIdentity.ForType(methodDescriptor.OutputType.ClrType));
var responseBody = httpRule.ResponseBody;

if (!string.IsNullOrEmpty(responseBody))
{
var responseBodyDescriptor = ServiceDescriptorHelpers.ResolveResponseBodyDescriptor(responseBody, methodDescriptor);
if (responseBodyDescriptor.IsRepeated)
{
if (responseBodyDescriptor.IsMap)
{
var key = responseBodyDescriptor.MessageType.FindFieldByName("key");
var value = responseBodyDescriptor.MessageType.FindFieldByName("value");

var keyType = MessageDescriptorHelpers.ResolveFieldType(key);
var valueType = MessageDescriptorHelpers.ResolveFieldType(value);

modelMetadata = new GrpcModelMetadata(ModelMetadataIdentity.ForType(typeof(Dictionary<,>).MakeGenericType(keyType, valueType)));
}
else
{
modelMetadata = new GrpcModelMetadata(ModelMetadataIdentity.ForType(typeof(List<>).MakeGenericType(MessageDescriptorHelpers.ResolveFieldType(responseBodyDescriptor))));
}
}
else
{
modelMetadata = new GrpcModelMetadata(ModelMetadataIdentity.ForType(MessageDescriptorHelpers.ResolveFieldType(responseBodyDescriptor)));
}
}

apiDescription.SupportedResponseTypes.Add(new ApiResponseType
{
ApiResponseFormats = { new ApiResponseFormat { MediaType = "application/json" } },
ModelMetadata = new GrpcModelMetadata(ModelMetadataIdentity.ForType(methodDescriptor.OutputType.ClrType)),
ModelMetadata = modelMetadata,
StatusCode = 200
});
var explorerSettings = routeEndpoint.Metadata.GetMetadata<ApiExplorerSettingsAttribute>();
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12 changes: 12 additions & 0 deletions src/GrpcHttpApi/src/Shared/ServiceDescriptorHelpers.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -318,6 +318,18 @@ public static Dictionary<string, List<FieldDescriptor>> ResolveRouteParameterDes
return null;
}

public static FieldDescriptor ResolveResponseBodyDescriptor(string responseBody, MethodDescriptor methodDescriptor)
{
if (!TryResolveDescriptors(methodDescriptor.OutputType, responseBody, out var responseBodyFieldDescriptors))
{
throw new InvalidOperationException($"Couldn't find matching field for response-body '{responseBody}' on {methodDescriptor.OutputType.Name}.");
}

var fieldDescriptor = responseBodyFieldDescriptors.Last();
return fieldDescriptor;

}

public record BodyDescriptorInfo(
MessageDescriptor Descriptor,
List<FieldDescriptor>? FieldDescriptors,
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