Validation

.editorconfig

@@ -6,7 +6,7 @@ root = true
 [*]
 indent_style = space
 vsspell_section_id = cb4a4387061549238f01a4c2739f296e
-vsspell_ignored_keywords_cb4a4387061549238f01a4c2739f296e = Mongo
+vsspell_ignored_keywords_cb4a4387061549238f01a4c2739f296e = Mongo|validators
 
 # XML project files
 [*.{csproj,vbproj,vcxproj,vcxproj.filters,proj,projitems,shproj}]
@@ -141,4 +141,4 @@ csharp_preserve_single_line_blocks = true
 ###############################
 [*.vb]
 # Modifier preferences
-visual_basic_preferred_modifier_order = Partial,Default,Private,Protected,Public,Friend,NotOverridable,Overridable,MustOverride,Overloads,Overrides,MustInherit,NotInheritable,Static,Shared,Shadows,ReadOnly,WriteOnly,Dim,Const,WithEvents,Widening,Narrowing,Custom,Async:suggestion
+visual_basic_preferred_modifier_order = Partial,Default,Private,Protected,Public,Friend,NotOverridable,Overridable,MustOverride,Overloads,Overrides,MustInherit,NotInheritable,Static,Shared,Shadows,ReadOnly,WriteOnly,Dim,Const,WithEvents,Widening,Narrowing,Custom,Async:suggestion

Directory.Packages.props

@@ -3,6 +3,8 @@
     <PackageVersion Include="Autofac" Version="7.0.1" />
     <PackageVersion Include="Autofac.Extensions.DependencyInjection" Version="8.0.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.0" />
+    <PackageVersion Include="FluentValidation" Version="11.6.0" />
+    <PackageVersion Include="FluentValidation.AspNetCore" Version="11.3.0" />
     <PackageVersion Include="IdGen" Version="3.0.3" />
     <PackageVersion Include="IdGen.DependencyInjection" Version="3.0.0" />
     <PackageVersion Include="MediatR" Version="12.1.1" />

src/API.Core/API.Core.csproj

@@ -8,6 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Autofac" />
+    <PackageReference Include="FluentValidation" />
     <PackageReference Include="IdGen" />
     <PackageReference Include="MediatR" />
     <PackageReference Include="TIKSN-Framework" />

src/API.Core/Validators/ValidationBehavior.cs

@@ -0,0 +1,31 @@
+using FluentValidation;
+using MediatR;
+
+namespace Fossa.API.Core.Validators;
+
+public class ValidationBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse> where TRequest : IRequest<TResponse>
+{
+  private readonly IEnumerable<IValidator<TRequest>> _validators;
+
+  public ValidationBehavior(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))).ConfigureAwait(false);
+      var failures = validationResults.SelectMany(r => r.Errors).Where(f => f != null).ToList();
+      if (failures.Count != 0)
+        throw new ValidationException(failures);
+    }
+
+    return await next().ConfigureAwait(false);
+  }
+}

src/API.Web/API.Web.csproj

@@ -11,6 +11,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="FluentValidation.AspNetCore" />
     <PackageReference Include="IdGen.DependencyInjection" />
     <PackageReference Include="MediatR" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" />

src/API.Web/Program.cs

@@ -1,6 +1,8 @@
 using Autofac;
 using Autofac.Extensions.DependencyInjection;
+using FluentValidation;
 using Fossa.API.Core;
+using Fossa.API.Core.Validators;
 using Fossa.API.Infrastructure;
 using Fossa.API.Persistence;
 using Fossa.API.Web;
@@ -51,17 +53,22 @@
 
 builder.Services.AddFrameworkPlatform();
 
-builder.Services.AddMediatR(cfg =>
-{
-  cfg.RegisterServicesFromAssemblies(Seq(
+var assemblies = Seq(
     typeof(DefaultCoreModule),
     typeof(DefaultInfrastructureModule),
     typeof(DefaultPersistenceModule),
     typeof(DefaultWebModule))
     .Map(x => x.Assembly)
-    .ToArray());
+    .ToArray();
+
+builder.Services.AddMediatR(cfg =>
+{
+  cfg.RegisterServicesFromAssemblies(assemblies);
+  cfg.AddOpenBehavior(typeof(ValidationBehavior<,>));
 });
 
+builder.Services.AddValidatorsFromAssemblies(assemblies);
+
 builder.Services.Scan(scan => scan
     .FromApplicationDependencies()
         .AddClasses(classes => classes.AssignableTo(typeof(IMapper<,>)))