refactor

internal/usecase/auth/service.go

@@ -0,0 +1,141 @@
+package auth
+
+import (
+	"context"
+
+	"counter/internal/domain/entities"
+	"counter/internal/domain/repositories"
+	"counter/internal/infrastructure/security"
+)
+
+// AuthService handles authentication business logic
+type AuthService struct {
+	userRepo        repositories.UserRepository
+	passwordService security.PasswordService
+	jwtService      security.JWTService
+}
+
+// NewAuthService creates a new authentication service
+func NewAuthService(
+	userRepo repositories.UserRepository,
+	passwordService security.PasswordService,
+	jwtService security.JWTService,
+) *AuthService {
+	return &AuthService{
+		userRepo:        userRepo,
+		passwordService: passwordService,
+		jwtService:      jwtService,
+	}
+}
+
+// RegisterRequest represents a user registration request
+type RegisterRequest struct {
+	Username string `json:"username" binding:"required,min=3,max=50"`
+	Email    string `json:"email" binding:"required,email"`
+	Password string `json:"password" binding:"required,min=6"`
+}
+
+// LoginRequest represents a user login request
+type LoginRequest struct {
+	Username string `json:"username" binding:"required"`
+	Password string `json:"password" binding:"required"`
+}
+
+// AuthResponse represents an authentication response
+type AuthResponse struct {
+	Token string         `json:"token"`
+	User  *entities.User `json:"user"`
+}
+
+// Register registers a new user
+func (s *AuthService) Register(ctx context.Context, req *RegisterRequest) (*AuthResponse, error) {
+	// Check if username already exists
+	_, err := s.userRepo.FindByUsername(ctx, req.Username)
+	if err == nil {
+		return nil, entities.ErrUserAlreadyExists
+	}
+	if err != entities.ErrUserNotFound {
+		return nil, err
+	}
+
+	// Check if email already exists
+	_, err = s.userRepo.FindByEmail(ctx, req.Email)
+	if err == nil {
+		return nil, entities.ErrUserAlreadyExists
+	}
+	if err != entities.ErrUserNotFound {
+		return nil, err
+	}
+
+	// Hash password
+	hashedPassword, err := s.passwordService.HashPassword(req.Password)
+	if err != nil {
+		return nil, err
+	}
+
+	// Create user
+	user := &entities.User{
+		Username: req.Username,
+		Email:    req.Email,
+		Password: hashedPassword,
+	}
+
+	if err := s.userRepo.Create(ctx, user); err != nil {
+		return nil, err
+	}
+
+	// Generate token
+	token, err := s.jwtService.GenerateToken(user.ID, user.Username)
+	if err != nil {
+		return nil, err
+	}
+
+	// Clear password from response
+	user.ClearPassword()
+
+	return &AuthResponse{
+		Token: token,
+		User:  user,
+	}, nil
+}
+
+// Login authenticates a user
+func (s *AuthService) Login(ctx context.Context, req *LoginRequest) (*AuthResponse, error) {
+	// Find user
+	user, err := s.userRepo.FindByUsername(ctx, req.Username)
+	if err != nil {
+		return nil, entities.ErrInvalidCredentials
+	}
+
+	// Check password
+	if !s.passwordService.CheckPasswordHash(req.Password, user.Password) {
+		return nil, entities.ErrInvalidCredentials
+	}
+
+	// Generate token
+	token, err := s.jwtService.GenerateToken(user.ID, user.Username)
+	if err != nil {
+		return nil, err
+	}
+
+	// Clear password from response
+	user.ClearPassword()
+
+	return &AuthResponse{
+		Token: token,
+		User:  user,
+	}, nil
+}
+
+// GetCurrentUser retrieves the current authenticated user
+func (s *AuthService) GetCurrentUser(ctx context.Context, userID int) (*entities.User, error) {
+	user, err := s.userRepo.FindByID(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+
+	// Clear password from response
+	user.ClearPassword()
+
+	return user, nil
+}