Перепиливание под чистый DDD

backend/src/Modules/Auth/Domain/AuthErrors.cs

@@ -0,0 +1,15 @@
+using Knot.Shared.Kernel;
+
+namespace Knot.Modules.Auth.Domain;
+
+public static class AuthErrors
+{
+    public static readonly Error FriendsNotFound = new Error("Friends.NotFound", "Friendship not found");
+    public static readonly Error FriendsSelf = new Error("Friends.Self", "Cannot add yourself");
+    public static readonly Error FriendsExists = new Error("Friends.Exists", "Friendship already exists");
+    public static readonly Error UserNotFound = new Error("User.NotFound", "User not found");
+    public static readonly Error IdentityInvalidCredentials = new Error("Identity.InvalidCredentials", "Неверное имя пользователя или пароль.");
+    public static readonly Error IdentityRegistrationDisabled = new Error("Identity.RegistrationDisabled", "Registration is disabled by the administrator.");
+    public static readonly Error IdentityUsernameNotUnique = new Error("Identity.UsernameNotUnique", "Это имя пользователя уже занято.");
+}
+

backend/src/Modules/Auth/Domain/IUserRepository.cs

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+using Knot.Modules.Auth.Domain;
+
+namespace Knot.Modules.Auth.Domain;
+
+/// <summary>
+/// Интерфейс репозитория для работы с пользователями.
+/// </summary>
+public interface IUserRepository
+{
+    Task<User?> GetByIdAsync(Guid id, CancellationToken cancellationToken = default);
+    Task<List<User>> GetByIdsAsync(IEnumerable<Guid> ids, CancellationToken cancellationToken = default);
+    Task<User?> GetByUsernameAsync(string username, CancellationToken cancellationToken = default);
+    Task<bool> IsUsernameUniqueAsync(string username, CancellationToken cancellationToken = default);
+    Task<List<User>> SearchUsersAsync(string query, CancellationToken cancellationToken = default);
+    void Add(User user);
+    void Update(User user);
+}
+

backend/src/Modules/Auth/Domain/User.cs

@@ -0,0 +1,61 @@
+using Knot.Shared.Kernel;
+
+namespace Knot.Modules.Auth.Domain;
+
+/// <summary>
+/// Сущность пользователя в контексте идентификации (Identity).
+/// </summary>
+public sealed class User : AggregateRoot<Guid>
+{
+    public string Username { get; private set; }
+    public string PasswordHash { get; private set; }
+    public string DisplayName { get; private set; }
+    public string? Email { get; private set; }
+    public string? Bio { get; private set; }
+    public string? Avatar { get; private set; }
+    public DateTime? Birthday { get; private set; }
+    public DateTime CreatedAt { get; private set; }
+    public bool HideStoryViews { get; private set; }
+
+    private User(Guid id, string username, string passwordHash, string displayName, string? email, string? bio = null)
+        : base(id)
+    {
+        Username = username;
+        PasswordHash = passwordHash;
+        DisplayName = displayName;
+        Email = email;
+        Bio = bio;
+        CreatedAt = DateTime.UtcNow;
+    }
+
+    /// <summary>
+    /// Фабричный метод для создания нового пользователя.
+    /// </summary>
+    public static User Create(string username, string passwordHash, string displayName, string? email = null, string? bio = null)
+    {
+        return new User(Guid.NewGuid(), username, passwordHash, displayName, email, bio);
+    }
+
+    public void UpdateProfile(string displayName, string? bio, DateTime? birthday)
+    {
+        DisplayName = displayName;
+        Bio = bio;
+        Birthday = birthday;
+    }
+
+    public void UpdateAvatar(string? avatarUrl)
+    {
+        Avatar = avatarUrl;
+    }
+
+    public void UpdateSettings(bool hideStoryViews)
+    {
+        HideStoryViews = hideStoryViews;
+    }
+
+    public void ChangePassword(string newPasswordHash)
+    {
+        PasswordHash = newPasswordHash;
+    }
+}
+