ref: project structure

application/Users/Commands/CreateUser.cs

@@ -0,0 +1,58 @@
+using AutoMapper;
+using MediatR;
+using mws.backend.dotnet.application.Auth;
+using mws.backend.dotnet.application.Common;
+using mws.backend.dotnet.application.Permissions;
+using mws.backend.dotnet.domain.Roles;
+using mws.backend.dotnet.domain.Users;
+
+namespace mws.backend.dotnet.application.Users;
+
+public record CreateUserCommand(Guid ActorUserId, CreateUserRequest Request) : IRequest<UserDto>;
+
+public class CreateUserHandler(IUnitOfWork uow, IPasswordHasher passwordHasher, IPermissionService permissions, IMapper mapper)
+    : IRequestHandler<CreateUserCommand, UserDto>
+{
+    private const string Screen = "users";
+
+    public async Task<UserDto> Handle(CreateUserCommand command, CancellationToken ct)
+    {
+        await permissions.EnsureAsync(command.ActorUserId, Screen, PermissionAction.Create, ct);
+
+        var request = command.Request;
+        var username = request.Username.Trim();
+        if (string.IsNullOrWhiteSpace(username) || string.IsNullOrWhiteSpace(request.Password))
+        {
+            throw new BadRequestException("Username and password are required");
+        }
+
+        if (await uow.Users.ExistsByUsernameAsync(username, ct))
+        {
+            throw new BadRequestException("Username already exists");
+        }
+
+        Role? role = null;
+        if (request.RoleId.HasValue)
+        {
+            role = await uow.Roles.GetByIdAsync(request.RoleId.Value, ct)
+                ?? throw new BadRequestException("Role not found");
+        }
+
+        var now = DateTime.UtcNow;
+        var user = new User
+        {
+            Id = Guid.NewGuid(),
+            Username = username,
+            PasswordHash = passwordHasher.Hash(request.Password),
+            DisplayName = request.DisplayName.Trim(),
+            IsActive = true,
+            CreatedAt = now,
+            UpdatedAt = now,
+            UserRoles = role != null ? new List<UserRole> { new UserRole { RoleId = role.Id } } : new List<UserRole>()
+        };
+
+        uow.Users.Add(user);
+        await uow.SaveChangesAsync(ct);
+        return mapper.Map<UserDto>(user);
+    }
+}