dotnet-cqrs/PoweredSoft.CQRS.GraphQL.HotChocolate/MutationParamRequiredMiddleware.cs

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C#
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using HotChocolate;
using HotChocolate.Resolvers;
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
namespace PoweredSoft.CQRS.GraphQL.HotChocolate
{
public class MutationParamRequiredMiddleware
{
private readonly FieldDelegate _next;
public MutationParamRequiredMiddleware(FieldDelegate next)
{
_next = next;
}
public async Task InvokeAsync(IMiddlewareContext context)
{
var queryArgument = context.ArgumentValue<object>("params");
if (queryArgument == null)
{
context.Result = ErrorBuilder.New()
.SetMessage("mutation argument is required")
.SetCode("400")
.SetPath(context.Path)
.AddLocation(context.Selection.SyntaxNode)
.Build();
return;
}
await _next.Invoke(context);
}
}
}