I'm working on the UsersRepository

userValidotor has been added and tests are being developed

Govor.Core/Govor.Core.csproj

@@ -8,7 +8,6 @@
 
     <ItemGroup>
       <Folder Include="DTOs\" />
-      <Folder Include="Infrastructure\" />
     </ItemGroup>
 
 </Project>

Govor.Core/GovorCoreException.cs

@@ -0,0 +1,15 @@
+namespace Govor.Core;
+
+/// <summary>
+/// Base exception class for Govor solutions 
+/// </summary>
+public class GovorCoreException : Exception
+{
+    public GovorCoreException() { }
+    
+    public GovorCoreException(string message) 
+        : base(message) { }
+    
+    public GovorCoreException(string message, Exception innerException)
+        : base(message, innerException) { }
+}

Govor.Core/Infrastructure/Validators/IObjectValidator.cs

@@ -0,0 +1,9 @@
+namespace Govor.Core.Infrastructure.Validators;
+
+public interface IObjectValidator<T>
+{
+    void Validate(T objectToValidate);
+    bool TryValidate(T objectToValidate);
+}
+
+class InvalidObjectException<T>(Exception ex) : GovorCoreException($"The object {typeof(T).FullName} is invalid.", ex);

Govor.Core/Infrastructure/Validators/UserValidator.cs

@@ -0,0 +1,39 @@
+using Govor.Core.Models;
+using ArgumentNullException = System.ArgumentNullException;
+
+namespace Govor.Core.Infrastructure.Validators;
+
+public class UserValidator : IObjectValidator<User>
+{
+    public void Validate(User user)
+    {
+        try
+        {
+            if (user is null)
+                throw new ArgumentNullException(nameof(user));
+            if(user.Id == Guid.Empty)
+                throw new ArgumentException("User ID cannot be empty", nameof(user.Id));
+            if(user.HashPassword is null || user.HashPassword == string.Empty)
+                throw new ArgumentException("Password cannot be empty", nameof(user.HashPassword));
+            if(user.CreatedOn == DateTime.MinValue)
+                throw new ArgumentException("Time of creation account cannot be empty", nameof(user.CreatedOn));
+        }
+        catch(Exception ex) 
+        {
+            throw new InvalidObjectException<User>(ex);
+        }
+    }
+
+    public bool TryValidate(User objectToValidate)
+    {
+        try
+        {
+            Validate(objectToValidate);
+            return true;
+        }
+        catch (InvalidObjectException<User> ex)
+        {
+            return false;
+        }
+    }
+}