Add FluentValidation

src/Imprink.Application/Imprink.Application.csproj

@@ -8,8 +8,10 @@
 
     <ItemGroup>
       <PackageReference Include="AutoMapper" Version="14.0.0" />
-      <PackageReference Include="FluentValidation" Version="12.0.0-preview1" />
+      <PackageReference Include="FluentValidation" Version="12.0.0" />
+      <PackageReference Include="FluentValidation.DependencyInjectionExtensions" Version="12.0.0" />
       <PackageReference Include="MediatR" Version="12.5.0" />
+      <PackageReference Include="MediatR.Extensions.Microsoft.DependencyInjection" Version="11.1.0" />
       <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.4" />
     </ItemGroup>
 
@@ -17,4 +19,8 @@
       <ProjectReference Include="..\Imprink.Domain\Imprink.Domain.csproj" />
     </ItemGroup>
 
+    <ItemGroup>
+      <Folder Include="Validation\Users\" />
+    </ItemGroup>
+
 </Project>

src/Imprink.Application/Products/GetProductsHandler.cs

@@ -1,5 +1,5 @@
 using Imprink.Application.Products.Dtos;
-using Imprink.Domain.Common.Models;
+using Imprink.Domain.Models;
 using MediatR;
 
 namespace Imprink.Application.Products;

src/Imprink.Application/Users/SyncUserHandler.cs

@@ -1,4 +1,4 @@
-using Imprink.Domain.Common.Models;
+using Imprink.Domain.Models;
 using MediatR;
 
 namespace Imprink.Application.Users;

src/Imprink.Application/Validation/Models/Auth0UserValidator.cs

@@ -0,0 +1,23 @@
+using FluentValidation;
+using Imprink.Domain.Models;
+
+namespace Imprink.Application.Validation.Models;
+
+public class Auth0UserValidator : AbstractValidator<Auth0User>
+{
+    public Auth0UserValidator()
+    {
+        RuleFor(x => x.Sub)
+            .NotEmpty();
+        
+        RuleFor(x => x.Name)
+            .NotEmpty();
+        
+        RuleFor(x => x.Nickname)
+            .NotEmpty();
+        
+        RuleFor(x => x.Email)
+            .NotEmpty()
+            .EmailAddress();
+    }
+}

src/Imprink.Application/Validation/Models/ProductFilterParametersValidator.cs

@@ -0,0 +1,45 @@
+using FluentValidation;
+using Imprink.Domain.Models;
+
+namespace Imprink.Application.Validation.Models;
+
+public class ProductFilterParametersValidator : AbstractValidator<ProductFilterParameters>
+{
+    public ProductFilterParametersValidator()
+    {
+        RuleFor(x => x.PageNumber)
+            .GreaterThan(0).WithMessage("PageNumber must be greater than 0.");
+
+        RuleFor(x => x.PageSize)
+            .InclusiveBetween(1, 100).WithMessage("PageSize must be between 1 and 100.");
+        
+        RuleFor(x => x.SearchTerm)
+            .Length(1, 100).WithMessage("Length must be between 1 and 100.")
+            .When(x => !string.IsNullOrWhiteSpace(x.SearchTerm));
+
+        RuleFor(x => x.MinPrice)
+            .GreaterThanOrEqualTo(0).When(x => x.MinPrice.HasValue)
+            .WithMessage("MinPrice cannot be negative.");
+
+        RuleFor(x => x.MaxPrice)
+            .GreaterThanOrEqualTo(0).When(x => x.MaxPrice.HasValue)
+            .WithMessage("MaxPrice cannot be negative.");
+
+        RuleFor(x => x)
+            .Must(x => !x.MinPrice.HasValue || !x.MaxPrice.HasValue || x.MinPrice <= x.MaxPrice)
+            .WithMessage("MinPrice cannot be greater than MaxPrice.");
+
+        RuleFor(x => x.SortBy)
+            .NotEmpty().WithMessage("SortBy is required.")
+            .Must(value => AllowedSortColumns.Contains(value, StringComparer.OrdinalIgnoreCase))
+            .WithMessage("SortBy must be one of: Name, Price, CreatedDate.");
+
+        RuleFor(x => x.SortDirection)
+            .NotEmpty().WithMessage("SortDirection is required.")
+            .Must(value => value.Equals("ASC", StringComparison.OrdinalIgnoreCase) 
+                           || value.Equals("DESC", StringComparison.OrdinalIgnoreCase))
+            .WithMessage("SortDirection must be 'ASC' or 'DESC'.");
+    }
+
+    private static readonly string[] AllowedSortColumns = ["Name", "Price", "CreatedDate"];
+}

src/Imprink.Application/Validation/Products/GetProductsQueryValidator.cs

@@ -0,0 +1,15 @@
+using FluentValidation;
+using Imprink.Application.Products;
+using Imprink.Application.Validation.Models;
+
+namespace Imprink.Application.Validation.Products;
+
+public class GetProductsQueryValidator : AbstractValidator<GetProductsQuery>
+{
+    public GetProductsQueryValidator()
+    {
+        RuleFor(x => x.FilterParameters)
+            .NotNull()
+            .SetValidator(new ProductFilterParametersValidator());
+    }
+}