Add validation to RealmCreate

IdentityShroud.Api/Validation/ValidateFilter.cs

@@ -0,0 +1,33 @@
+using FluentValidation;
+
+namespace IdentityShroud.Api.Validation;
+
+public class ValidateFilter<T> : IEndpointFilter where T : class
+{
+    public async ValueTask<object?> InvokeAsync(
+        EndpointFilterInvocationContext context,
+        EndpointFilterDelegate next)
+    {
+        // Grab the deserialized argument (the DTO) from the context.
+        // The order of arguments matches the order of parameters in the endpoint delegate.
+        var dto = context.Arguments
+            .FirstOrDefault(arg => arg is T) as T;
+
+        if (dto == null)
+            return Results.BadRequest("Unable to read request body.");
+
+        // Resolve the matching validator from DI.
+        var validator = context.HttpContext.RequestServices
+            .GetService<IValidator<T>>();
+
+        if (validator != null)
+        {
+            var validationResult = await validator.ValidateAsync(dto);
+            if (!validationResult.IsValid)
+                return Results.ValidationProblem(validationResult.ToDictionary());
+        }
+
+        // Validation passed – continue to the actual handler.
+        return await next(context);
+    }
+}