remove: remove internal/auth/mfa_service.go

• Deleted unused mfa_service.go file
• Fixed import in api/api.go for auth package
• Build verified and working

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

account/api/api.go

@@ -21,6 +21,7 @@ import (
 	"github.com/pquerna/otp/totp"
 	"golang.org/x/crypto/bcrypt"
 
+	"xcontrol/account/internal/auth"
 	"xcontrol/account/internal/service"
 	"xcontrol/account/internal/store"
 )

account/internal/auth/mfa_service.go

@@ -1,80 +0,0 @@
-package auth
-
-import (
-	"crypto/rand"
-	"encoding/base32"
-	"fmt"
-	"time"
-
-	"github.com/pquerna/otp"
-	"github.com/pquerna/otp/totp"
-)
-
-// MFAService handles Multi-Factor Authentication
-type MFAService struct {
-	issuer string
-}
-
-// NewMFAService creates a new MFA service instance
-func NewMFAService(issuer string) *MFAService {
-	return &MFAService{
-		issuer: issuer,
-	}
-}
-
-// GenerateSecret generates a new TOTP secret
-func (s *MFAService) GenerateSecret() (string, error) {
-	secret := make([]byte, 20)
-	if _, err := rand.Read(secret); err != nil {
-		return "", fmt.Errorf("failed to generate secret: %w", err)
-	}
-	return base32.StdEncoding.EncodeToString(secret), nil
-}
-
-// GenerateQRCode generates a QR code for TOTP setup
-func (s *MFAService) GenerateQRCode(accountName, secret string) (string, error) {
-	key, err := otp.NewKey(totp.KeyURI(accountName, s.issuer, secret, otp.AlgorithmSHA1, 6, 30))
-	if err != nil {
-		return "", fmt.Errorf("failed to generate TOTP key URI: %w", err)
-	}
-	return key.QRCode(), nil
-}
-
-// ValidateTOTP validates a TOTP code against a secret
-func (s *MFAService) ValidateTOTP(secret, code string) (bool, error) {
-	valid, err := totp.ValidateCustom(code, secret, time.Now(), totp.ValidateOpts{
-		Period:    30,
-		Skew:      1,
-		Digits:    otp.DigitsSix,
-		Algorithm: otp.AlgorithmSHA1,
-	})
-	if err != nil {
-		return false, fmt.Errorf("failed to validate TOTP: %w", err)
-	}
-	return valid, nil
-}
-
-// GenerateBackupCodes generates backup codes for MFA
-func (s *MFAService) GenerateBackupCodes(count int) ([]string, error) {
-	codes := make([]string, count)
-	for i := 0; i < count; i++ {
-		code := make([]byte, 4)
-		if _, err := rand.Read(code); err != nil {
-			return nil, fmt.Errorf("failed to generate backup code: %w", err)
-		}
-		codes[i] = fmt.Sprintf("%08X", code)
-	}
-	return codes, nil
-}
-
-// ValidateBackupCode validates a backup code
-func (s *MFAService) ValidateBackupCode(providedCode string, storedCodes []string) (bool, error) {
-	for i, storedCode := range storedCodes {
-		if providedCode == storedCode {
-			// Remove used backup code
-			storedCodes = append(storedCodes[:i], storedCodes[i+1:]...)
-			return true, nil
-		}
-	}
-	return false, nil
-}