init backend

dotnet/AipsCore/Domain/Models/User/ValueObjects/UserId.cs

@@ -0,0 +1,5 @@
+using AipsCore.Domain.Common.ValueObjects;
+
+namespace AipsCore.Domain.Models.User.ValueObjects;
+
+public record UserId(string IdValue) : DomainId(IdValue);

dotnet/AipsCore/Domain/Models/User/ValueObjects/Username.cs

@@ -0,0 +1,33 @@
+using AipsCore.Domain.Abstract;
+using AipsCore.Domain.Abstract.Rule;
+using AipsCore.Domain.Abstract.ValueObject;
+using AipsCore.Domain.Common.Validation;
+using AipsCore.Domain.Common.Validation.Rules;
+using AipsCore.Domain.Common.ValueObjects;
+using AipsCore.Domain.Models.User.Validation;
+
+namespace AipsCore.Domain.Models.User.ValueObjects;
+
+public record Username : AbstractValueObject
+{
+    public string UsernameValue { get; init; }
+    
+    public Username(string UsernameValue)
+    {
+        this.UsernameValue = UsernameValue;
+        Validate();
+    }
+
+    private const int MinimumLength = 8;
+    private const int MaximumLength = 20;
+
+    protected override ICollection<IRule> GetValidationRules()
+    {
+        return
+        [
+            new MinLengthRule(UsernameValue, MinimumLength),
+            new MaxLengthRule(UsernameValue, MaximumLength),
+            new UsernameCharsetRule(UsernameValue)
+        ];
+    }
+}