validators

WebApi/Filters/ValidationFilter.cs

@@ -0,0 +1,28 @@
+using FluentValidation;
+
+namespace WebApi.Filters;
+
+public sealed class ValidationFilter : IEndpointFilter
+{
+    public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
+    {
+        foreach (var argument in context.Arguments)
+        {
+            if (argument is null)
+                continue;
+
+            var validatorType = typeof(IValidator<>).MakeGenericType(argument.GetType());
+
+            if (context.HttpContext.RequestServices.GetService(validatorType) is not IValidator validator)
+                continue;
+
+            var validationContext = new ValidationContext<object>(argument);
+            var result = await validator.ValidateAsync(validationContext, context.HttpContext.RequestAborted);
+
+            if (!result.IsValid)
+                return Results.ValidationProblem(result.ToDictionary());
+        }
+
+        return await next(context);
+    }
+}