new-api/model/twofa.go

package model

import (
	"errors"
	"fmt"
	"one-api/common"
	"time"

	"gorm.io/gorm"
)

var ErrTwoFANotEnabled = errors.New("用户未启用2FA")

// TwoFA 用户2FA设置表
type TwoFA struct {
	Id             int            `json:"id" gorm:"primaryKey"`
	UserId         int            `json:"user_id" gorm:"unique;not null;index"`
	Secret         string         `json:"-" gorm:"type:varchar(255);not null"` // TOTP密钥，不返回给前端
	IsEnabled      bool           `json:"is_enabled" gorm:"default:false"`
	FailedAttempts int            `json:"failed_attempts" gorm:"default:0"`
	LockedUntil    *time.Time     `json:"locked_until,omitempty"`
	LastUsedAt     *time.Time     `json:"last_used_at,omitempty"`
	CreatedAt      time.Time      `json:"created_at"`
	UpdatedAt      time.Time      `json:"updated_at"`
	DeletedAt      gorm.DeletedAt `json:"-" gorm:"index"`
}

// TwoFABackupCode 备用码使用记录表
type TwoFABackupCode struct {
	Id        int            `json:"id" gorm:"primaryKey"`
	UserId    int            `json:"user_id" gorm:"not null;index"`
	CodeHash  string         `json:"-" gorm:"type:varchar(255);not null"` // 备用码哈希
	IsUsed    bool           `json:"is_used" gorm:"default:false"`
	UsedAt    *time.Time     `json:"used_at,omitempty"`
	CreatedAt time.Time      `json:"created_at"`
	DeletedAt gorm.DeletedAt `json:"-" gorm:"index"`
}

// GetTwoFAByUserId 根据用户ID获取2FA设置
func GetTwoFAByUserId(userId int) (*TwoFA, error) {
	if userId == 0 {
		return nil, errors.New("用户ID不能为空")
	}

	var twoFA TwoFA
	err := DB.Where("user_id = ?", userId).First(&twoFA).Error
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, nil // 返回nil表示未设置2FA
		}
		return nil, err
	}

	return &twoFA, nil
}

// IsTwoFAEnabled 检查用户是否启用了2FA
func IsTwoFAEnabled(userId int) bool {
	twoFA, err := GetTwoFAByUserId(userId)
	if err != nil || twoFA == nil {
		return false
	}
	return twoFA.IsEnabled
}

// CreateTwoFA 创建2FA设置
func (t *TwoFA) Create() error {
	// 检查用户是否已存在2FA设置
	existing, err := GetTwoFAByUserId(t.UserId)
	if err != nil {
		return err
	}
	if existing != nil {
		return errors.New("用户已存在2FA设置")
	}

	// 验证用户存在
	var user User
	if err := DB.First(&user, t.UserId).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return errors.New("用户不存在")
		}
		return err
	}

	return DB.Create(t).Error
}

// Update 更新2FA设置
func (t *TwoFA) Update() error {
	if t.Id == 0 {
		return errors.New("2FA记录ID不能为空")
	}
	return DB.Save(t).Error
}

// Delete 删除2FA设置
func (t *TwoFA) Delete() error {
	if t.Id == 0 {
		return errors.New("2FA记录ID不能为空")
	}

	// 同时删除相关的备用码记录（硬删除）
	if err := DB.Unscoped().Where("user_id = ?", t.UserId).Delete(&TwoFABackupCode{}).Error; err != nil {
		return err
	}

	// 硬删除2FA记录
	return DB.Unscoped().Delete(t).Error
}

// ResetFailedAttempts 重置失败尝试次数
func (t *TwoFA) ResetFailedAttempts() error {
	t.FailedAttempts = 0
	t.LockedUntil = nil
	return t.Update()
}

// IncrementFailedAttempts 增加失败尝试次数
func (t *TwoFA) IncrementFailedAttempts() error {
	t.FailedAttempts++

	// 检查是否需要锁定
	if t.FailedAttempts >= common.MaxFailAttempts {
		lockUntil := time.Now().Add(time.Duration(common.LockoutDuration) * time.Second)
		t.LockedUntil = &lockUntil
	}

	return t.Update()
}

// IsLocked 检查账户是否被锁定
func (t *TwoFA) IsLocked() bool {
	if t.LockedUntil == nil {
		return false
	}
	return time.Now().Before(*t.LockedUntil)
}

// CreateBackupCodes 创建备用码
func CreateBackupCodes(userId int, codes []string) error {
	// 先删除现有的备用码
	if err := DB.Where("user_id = ?", userId).Delete(&TwoFABackupCode{}).Error; err != nil {
		return err
	}

	// 创建新的备用码记录
	for _, code := range codes {
		hashedCode, err := common.HashBackupCode(code)
		if err != nil {
			return err
		}

		backupCode := TwoFABackupCode{
			UserId:   userId,
			CodeHash: hashedCode,
			IsUsed:   false,
		}

		if err := DB.Create(&backupCode).Error; err != nil {
			return err
		}
	}

	return nil
}

// ValidateBackupCode 验证并使用备用码
func ValidateBackupCode(userId int, code string) (bool, error) {
	if !common.ValidateBackupCode(code) {
		return false, errors.New("验证码或备用码不正确")
	}

	normalizedCode := common.NormalizeBackupCode(code)

	// 查找未使用的备用码
	var backupCodes []TwoFABackupCode
	if err := DB.Where("user_id = ? AND is_used = false", userId).Find(&backupCodes).Error; err != nil {
		return false, err
	}

	// 验证备用码
	for _, bc := range backupCodes {
		if common.ValidatePasswordAndHash(normalizedCode, bc.CodeHash) {
			// 标记为已使用
			now := time.Now()
			bc.IsUsed = true
			bc.UsedAt = &now

			if err := DB.Save(&bc).Error; err != nil {
				return false, err
			}

			return true, nil
		}
	}

	return false, nil
}

// GetUnusedBackupCodeCount 获取未使用的备用码数量
func GetUnusedBackupCodeCount(userId int) (int, error) {
	var count int64
	err := DB.Model(&TwoFABackupCode{}).Where("user_id = ? AND is_used = false", userId).Count(&count).Error
	return int(count), err
}

// DisableTwoFA 禁用用户的2FA
func DisableTwoFA(userId int) error {
	twoFA, err := GetTwoFAByUserId(userId)
	if err != nil {
		return err
	}
	if twoFA == nil {
		return ErrTwoFANotEnabled
	}

	// 删除2FA设置和备用码
	return twoFA.Delete()
}

// EnableTwoFA 启用2FA
func (t *TwoFA) Enable() error {
	t.IsEnabled = true
	t.FailedAttempts = 0
	t.LockedUntil = nil
	return t.Update()
}

// ValidateTOTPAndUpdateUsage 验证TOTP并更新使用记录
func (t *TwoFA) ValidateTOTPAndUpdateUsage(code string) (bool, error) {
	// 检查是否被锁定
	if t.IsLocked() {
		return false, fmt.Errorf("账户已被锁定，请在%v后重试", t.LockedUntil.Format("2006-01-02 15:04:05"))
	}

	// 验证TOTP码
	if !common.ValidateTOTPCode(t.Secret, code) {
		// 增加失败次数
		if err := t.IncrementFailedAttempts(); err != nil {
			common.SysError("更新2FA失败次数失败: " + err.Error())
		}
		return false, nil
	}

	// 验证成功，重置失败次数并更新最后使用时间
	now := time.Now()
	t.FailedAttempts = 0
	t.LockedUntil = nil
	t.LastUsedAt = &now

	if err := t.Update(); err != nil {
		common.SysError("更新2FA使用记录失败: " + err.Error())
	}

	return true, nil
}

// ValidateBackupCodeAndUpdateUsage 验证备用码并更新使用记录
func (t *TwoFA) ValidateBackupCodeAndUpdateUsage(code string) (bool, error) {
	// 检查是否被锁定
	if t.IsLocked() {
		return false, fmt.Errorf("账户已被锁定，请在%v后重试", t.LockedUntil.Format("2006-01-02 15:04:05"))
	}

	// 验证备用码
	valid, err := ValidateBackupCode(t.UserId, code)
	if err != nil {
		return false, err
	}

	if !valid {
		// 增加失败次数
		if err := t.IncrementFailedAttempts(); err != nil {
			common.SysError("更新2FA失败次数失败: " + err.Error())
		}
		return false, nil
	}

	// 验证成功，重置失败次数并更新最后使用时间
	now := time.Now()
	t.FailedAttempts = 0
	t.LockedUntil = nil
	t.LastUsedAt = &now

	if err := t.Update(); err != nil {
		common.SysError("更新2FA使用记录失败: " + err.Error())
	}

	return true, nil
}

// GetTwoFAStats 获取2FA统计信息（管理员使用）
func GetTwoFAStats() (map[string]interface{}, error) {
	var totalUsers, enabledUsers int64

	// 总用户数
	if err := DB.Model(&User{}).Count(&totalUsers).Error; err != nil {
		return nil, err
	}

	// 启用2FA的用户数
	if err := DB.Model(&TwoFA{}).Where("is_enabled = true").Count(&enabledUsers).Error; err != nil {
		return nil, err
	}

	enabledRate := float64(0)
	if totalUsers > 0 {
		enabledRate = float64(enabledUsers) / float64(totalUsers) * 100
	}

	return map[string]interface{}{
		"total_users":   totalUsers,
		"enabled_users": enabledUsers,
		"enabled_rate":  fmt.Sprintf("%.1f%%", enabledRate),
	}, nil
}