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

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C#
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using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using HotChocolate;
using HotChocolate.Resolvers;
using Newtonsoft.Json;
using PoweredSoft.CQRS.GraphQL.Abstractions;
namespace PoweredSoft.CQRS.GraphQL.HotChocolate
{
public class QueryValidationMiddleware
{
private readonly FieldDelegate _next;
public QueryValidationMiddleware(FieldDelegate next)
{
_next = next;
}
public async Task InvokeAsync(IMiddlewareContext context)
{
var queryArgument = context.ArgumentValue<object>("params");
if (queryArgument != null)
{
var service = context.Service<IGraphQLValidationService>();
var result = await service.ValidateObjectAsync(queryArgument, context.RequestAborted);
if (!result.IsValid)
{
var eb = ErrorBuilder.New()
.SetMessage("There are some validations errors")
.SetCode("ValidationError")
.SetPath(context.Path)
.AddLocation(context.Selection.SyntaxNode);
foreach (var error in result.Errors)
eb.SetExtension(error.Field, error.Errors);
context.Result = eb.Build();
return;
}
}
await _next.Invoke(context);
}
}
}