Init

internal/auth/service.go

@@ -0,0 +1,32 @@
+package auth
+
+import (
+	"ResendIt/internal/security"
+	"ResendIt/internal/user"
+	"errors"
+)
+
+type Service struct {
+	repo *Repository
+}
+
+func NewService(r *Repository) *Service {
+	return &Service{repo: r}
+}
+
+func (s *Service) Login(username, password string) (string, error) {
+	u, err := s.repo.FindByUsername(username)
+
+	if errors.Is(err, user.ErrUserNotFound) {
+		// Prevent user enumeration by returning a generic error message
+		return "", ErrInvalidCredentials
+	} else if err != nil {
+		return "", err
+	}
+
+	if !security.CheckPassword(password, u.PasswordHash) {
+		return "", ErrInvalidCredentials
+	}
+
+	return GenerateJWT(u.Username, u.Role)
+}