initial commit

ConfigBackEnd/Behaviours/ValidationBehaviour.cs

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+namespace Indotalent.ConfigBackEnd.Behaviours;
+
+using FluentValidation;
+using MediatR;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+public class ValidationBehaviour<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse>
+    where TRequest : IRequest<TResponse>
+{
+    private readonly IEnumerable<IValidator<TRequest>> _validators;
+
+    public ValidationBehaviour(IEnumerable<IValidator<TRequest>> validators)
+    {
+        _validators = validators;
+    }
+
+    public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
+    {
+        if (_validators.Any())
+        {
+            var context = new ValidationContext<TRequest>(request);
+
+            var validationResults = await Task.WhenAll(
+                _validators.Select(v => v.ValidateAsync(context, cancellationToken)));
+
+            var failures = validationResults
+                .SelectMany(r => r.Errors)
+                .Where(f => f != null)
+                .ToList();
+
+            if (failures.Count != 0)
+            {
+                throw new ValidationException(failures);
+            }
+        }
+
+        return await next();
+    }
+}