NSwag Not Recognizing Custom Authorization Attributes - asp.net-core-webapi

Question

Currently having a problem with NSwag generation on a custom authorize attribute. I have been completely unable to find anything on this issue elsewhere.
I've created a custom attribute for my WebAPI and more or less followed the patterns recommended here
internal class AuthorizeWithPermissionAttribute : AuthorizeAttribute
{
const string POLICY_PREFIX = "HasPermission";
public AuthorizeWithPermissionAttribute(string permission) { // logic excluded for brevity }
public string Permission
{
get { // code }
set { // code }
}
}
Then I decorate my controller with this attribute like so
[AuthorizeWithPermission("MY_PERMISSION_NAME")]
public class MyController: ControllerBase
{
// Controller logic.
}
So far I have tried
Creating a public parameterless constructor on the attribute
Changing the type (enum, int, string) of the constructor param
Applying [OpenApiIgnore] to the type and then writing a custom filter in Startup.cs when that didn't work
Changing the access modifier at the class and property level
Applying the attribute broadly to the controller and methods directly.
Here is the error I'm getting:
Executing file 'nswag.json' with variables 'Configuration=Debug'...
3> Launcher directory: %UserDirectory%\.nuget\packages\nswag.msbuild\13.8.2\tools\NetCore31
3> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
3> ---> System.NullReferenceException: Object reference not set to an instance of an object.
3> at %SLNNAME%.Authorization.Attributes.AuthorizeWithPermissionAttribute..ctor(String permission) in %SLNDirectory%\Authorization\Attributes\AuthorizeWithPermissionAttribute.cs:line 14
3> at System.Reflection.CustomAttribute._CreateCaObject(RuntimeModule pModule, RuntimeType type, IRuntimeMethodInfo pCtor, Byte** ppBlob, Byte* pEndBlob, Int32* pcNamedArgs)
3> at System.Reflection.CustomAttribute.CreateCaObject(RuntimeModule module, RuntimeType type, IRuntimeMethodInfo ctor, IntPtr& blob, IntPtr blobEnd, Int32& namedArgs)
3> at System.Reflection.CustomAttribute.AddCustomAttributes(ListBuilder`1& attributes, RuntimeModule decoratedModule, Int32 decoratedMetadataToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, ListBuilder`1 derivedAttributes)
3> at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType)
3> at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeType type, RuntimeType caType, Boolean inherit)
3> at System.RuntimeType.GetCustomAttributes(Boolean inherit)
3> at Microsoft.AspNetCore.Mvc.ApplicationModels.DefaultApplicationModelProvider.CreateControllerModel(TypeInfo typeInfo)
3> at Microsoft.AspNetCore.Mvc.ApplicationModels.DefaultApplicationModelProvider.OnProvidersExecuting(ApplicationModelProviderContext context)
3> at Microsoft.AspNetCore.Mvc.ApplicationModels.ApplicationModelFactory.CreateApplicationModel(IEnumerable`1 controllerTypes)
3> at Microsoft.AspNetCore.Mvc.ApplicationModels.ControllerActionDescriptorProvider.GetDescriptors()
3> at Microsoft.AspNetCore.Mvc.ApplicationModels.ControllerActionDescriptorProvider.OnProvidersExecuting(ActionDescriptorProviderContext context)
3> at Microsoft.AspNetCore.Mvc.Infrastructure.DefaultActionDescriptorCollectionProvider.UpdateCollection()
3> at Microsoft.AspNetCore.Mvc.Infrastructure.DefaultActionDescriptorCollectionProvider.Initialize()
3> at Microsoft.AspNetCore.Mvc.Infrastructure.DefaultActionDescriptorCollectionProvider.get_ActionDescriptors()
3> at Microsoft.AspNetCore.Mvc.ApiExplorer.ApiDescriptionGroupCollectionProvider.get_ApiDescriptionGroups()
3> at NSwag.Generation.AspNetCore.AspNetCoreOpenApiDocumentGenerator.GenerateAsync(Object serviceProvider)
3> at NSwag.AspNetCore.OpenApiDocumentProvider.GenerateAsync(String documentName)
3> at NSwag.Commands.Generation.AspNetCore.AspNetCoreToSwaggerCommand.GenerateDocumentWithDocumentProviderAsync(IServiceProvider serviceProvider) in C:\projects\nswag\src\NSwag.Commands\Commands\Generation\AspNetCore\AspNetCoreToOpenApiCommand.cs:line 287
3> at NSwag.Commands.Generation.AspNetCore.AspNetCoreToSwaggerCommand.GenerateDocumentAsync(AssemblyLoader assemblyLoader, IServiceProvider serviceProvider, String currentWorkingDirectory) in C:\projects\nswag\src\NSwag.Commands\Commands\Generation\AspNetCore\AspNetCoreToOpenApiCommand.cs:line 276
3> at NSwag.Commands.Generation.AspNetCore.AspNetCoreToOpenApiGeneratorCommandEntryPoint.<>c__DisplayClass0_0.<<Process>b__0>d.MoveNext() in C:\projects\nswag\src\NSwag.Commands\Commands\Generation\AspNetCore\AspNetCoreToOpenApiGeneratorCommandEntryPoint.cs:line 30
3> --- End of stack trace from previous location where exception was thrown ---
3> at NSwag.Commands.Generation.AspNetCore.AspNetCoreToOpenApiGeneratorCommandEntryPoint.Process(String commandContent, String outputFile, String applicationName) in C:\projects\nswag\src\NSwag.Commands\Commands\Generation\AspNetCore\AspNetCoreToOpenApiGeneratorCommandEntryPoint.cs:line 29
3> --- End of inner exception stack trace ---
3> at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
3> at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
3> at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
3> at NSwag.AspNetCore.Launcher.Program.Main(String[] args) in C:\projects\nswag\src\NSwag.AspNetCore.Launcher\Program.cs:line 170
3> System.InvalidOperationException: Swagger generation failed with non-zero exit code '1'.
3> at NSwag.Commands.Generation.AspNetCore.AspNetCoreToSwaggerCommand.RunAsync(CommandLineProcessor processor, IConsoleHost host) in C:\projects\nswag\src\NSwag.Commands\Commands\Generation\AspNetCore\AspNetCoreToOpenApiCommand.cs:line 221
3> at NSwag.Commands.NSwagDocumentBase.GenerateSwaggerDocumentAsync() in C:\projects\nswag\src\NSwag.Commands\NSwagDocumentBase.cs:line 280
3> at NSwag.Commands.NSwagDocument.ExecuteAsync() in C:\projects\nswag\src\NSwag.Commands\NSwagDocument.cs:line 81
3> at NSwag.Commands.Document.ExecuteDocumentCommand.ExecuteDocumentAsync(IConsoleHost host, String filePath) in C:\projects\nswag\src\NSwag.Commands\Commands\Document\ExecuteDocumentCommand.cs:line 86
3> at NSwag.Commands.Document.ExecuteDocumentCommand.RunAsync(CommandLineProcessor processor, IConsoleHost host) in C:\projects\nswag\src\NSwag.Commands\Commands\Document\ExecuteDocumentCommand.cs:line 32
3> at NConsole.CommandLineProcessor.ProcessSingleAsync(String[] args, Object input)
3> at NConsole.CommandLineProcessor.ProcessAsync(String[] args, Object input)
3> at NConsole.CommandLineProcessor.Process(String[] args, Object input)
3> at NSwag.Commands.NSwagCommandProcessor.Process(String[] args) in C:\projects\nswag\src\NSwag.Commands\NSwagCommandProcessor.cs:line 56
3> %SLNDirectory%.csproj(59,5): error MSB3073: The command "dotnet "%UserDirectory%\.nuget\packages\nswag.msbuild\13.8.2\build\../tools/NetCore31/dotnet-nswag.dll" run nswag.json /variables:Configuration=Debug" exited with code -1.
3> Done executing task "Exec" -- FAILED.

Answer 1

LOGIC! LOGIC IN The constructor was the issue. Here this works. Hopefully someone won't spend two hours of their life on this like I did
public class AuthorizeWithPermissionAttribute : AuthorizeAttribute
{
const string POLICY_PREFIX = "HasPermission";
public AuthorizeWithPermissionAttribute(string permission)
{
this.Permission = permission;
}
public string Permission { get => Policy; set => Policy = $"{POLICY_PREFIX}{value}"; }
}