fix: 离线证到期重签空邮箱撞唯一索引

复用 customer_id/同名客户，禁止重复插入空 email；重签前端带回原客户。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/internal/dto/license.go

@@ -32,6 +32,7 @@ type LicenseResponse struct {
 	DeviceID           string `json:"device_id,omitempty"` // 离线证绑定设备
 	CustomerID         uint   `json:"customer_id"`
 	CustomerName       string `json:"customer_name"`
+	CustomerEmail      string `json:"customer_email,omitempty"`
 	ProductID          uint   `json:"product_id"`
 	ProductName        string `json:"product_name"`
 	Status             string `json:"status"`

backend/internal/service/license/license_service.go

@@ -304,8 +304,12 @@ func (s *LicenseService) ExportCSV(q ListQuery) (string, error) {
 // toLicenseResponse 模型转响应 DTO // Logan.Li
 func toLicenseResponse(l model.License) dto.LicenseResponse {
 	customerName := ""
+	customerEmail := ""
 	if l.Customer.ID > 0 {
 		customerName = l.Customer.Name
+		if !strings.HasSuffix(l.Customer.Email, "@local.invalid") {
+			customerEmail = l.Customer.Email
+		}
 	}
 	productName := ""
 	if l.Product.ID > 0 {
@@ -332,6 +336,7 @@ func toLicenseResponse(l model.License) dto.LicenseResponse {
 		DeviceID:           deviceID,
 		CustomerID:         l.CustomerID,
 		CustomerName:       customerName,
+		CustomerEmail:      customerEmail,
 		ProductID:          l.ProductID,
 		ProductName:        productName,
 		Status:             l.Status,

backend/internal/service/license/offline_service.go

@@ -6,6 +6,7 @@ import (
 	"backend/internal/model"
 	"backend/utils"
 	"errors"
+	"fmt"
 	"strings"
 	"time"
 
@@ -85,34 +86,24 @@ func (s *OfflineIssuer) Issue(req dto.OfflineLicenseCreate) (*dto.OfflineLicense
 			return nil, errors.New("客户不存在")
 		}
 	} else {
-		email := strings.TrimSpace(req.Email)
-		name := strings.TrimSpace(req.CustomerName)
-		if name == "" {
-			name = "离线客户"
-		}
-		if email != "" {
-			err := s.db.Where("email = ?", email).First(&customer).Error
+		var err error
+		customer, err = s.resolveOrCreateCustomer(req)
 		if err != nil {
-				customer = model.Customer{Name: name, Email: email, Status: 1}
-				if err := s.db.Create(&customer).Error; err != nil {
-					return nil, errors.New("创建客户失败")
-				}
-			}
-		} else {
-			customer = model.Customer{Name: name, Email: "", Status: 1}
-			if err := s.db.Create(&customer).Error; err != nil {
-				return nil, errors.New("创建客户失败")
-			}
+			return nil, err
 		}
 	}
 
 	now := time.Now().UTC()
 	exp := now.AddDate(0, 0, duration)
+	claimEmail := strings.TrimSpace(req.Email)
+	if claimEmail == "" && customer.Email != "" && !strings.HasSuffix(customer.Email, "@local.invalid") {
+		claimEmail = customer.Email
+	}
 	claims := utils.OfflineLicenseClaims{
 		V:            1,
 		ProductCode:  product.Code,
 		DeviceID:     deviceID,
-		Email:        strings.TrimSpace(req.Email),
+		Email:        claimEmail,
 		PlanType:     planType,
 		IssuedAt:     now.Unix(),
 		ExpiresAt:    exp.Unix(),
@@ -175,3 +166,39 @@ func (s *OfflineIssuer) Issue(req dto.OfflineLicenseCreate) (*dto.OfflineLicense
 		PublicKey:   s.kp.OfflinePublicKeyHex(),
 	}, nil
 }
+
+// resolveOrCreateCustomer 解析或创建离线签发客户；禁止重复插入空邮箱（uniqueIndex） // Logan.Li
+func (s *OfflineIssuer) resolveOrCreateCustomer(req dto.OfflineLicenseCreate) (model.Customer, error) {
+	email := strings.TrimSpace(req.Email)
+	name := strings.TrimSpace(req.CustomerName)
+	if name == "" {
+		name = "离线客户"
+	}
+
+	var customer model.Customer
+	if email != "" {
+		if err := s.db.Where("email = ?", email).First(&customer).Error; err == nil {
+			return customer, nil
+		}
+		customer = model.Customer{Name: name, Email: email, Status: 1}
+		if err := s.db.Create(&customer).Error; err != nil {
+			// 并发下可能已被创建，再查一次 // Logan.Li
+			if err2 := s.db.Where("email = ?", email).First(&customer).Error; err2 == nil {
+				return customer, nil
+			}
+			return customer, errors.New("创建客户失败")
+		}
+		return customer, nil
+	}
+
+	// 无邮箱：优先复用同名客户，避免空邮箱触发 UNIQUE 冲突 // Logan.Li
+	if err := s.db.Where("name = ?", name).Order("id ASC").First(&customer).Error; err == nil {
+		return customer, nil
+	}
+	placeholder := fmt.Sprintf("offline+%d@local.invalid", time.Now().UnixNano())
+	customer = model.Customer{Name: name, Email: placeholder, Status: 1}
+	if err := s.db.Create(&customer).Error; err != nil {
+		return customer, errors.New("创建客户失败")
+	}
+	return customer, nil
+}

frontend/src/views/OfflineLicenses.vue

@@ -135,7 +135,7 @@ const issueVisible = ref(false)
 const issuing = ref(false)
 const formRef = ref(null)
 const form = reactive({
-  device_id: '', email: '', customer_name: '', product_code: 'opsxshell',
+  device_id: '', email: '', customer_name: '', customer_id: 0, product_code: 'opsxshell',
   plan_type: 'yearly', duration_days: 365, notes: '',
 })
 const result = ref(null)
@@ -167,7 +167,7 @@ async function loadData() {
 
 function openIssue() {
   Object.assign(form, {
-    device_id: '', email: '', customer_name: '', product_code: 'opsxshell',
+    device_id: '', email: '', customer_name: '', customer_id: 0, product_code: 'opsxshell',
     plan_type: 'yearly', duration_days: 365, notes: '',
   })
   result.value = null
@@ -177,8 +177,9 @@ function openIssue() {
 function reissue(row) {
   Object.assign(form, {
     device_id: row.device_id || '',
-    email: '',
+    email: row.customer_email || '',
     customer_name: row.customer_name || '',
+    customer_id: row.customer_id || 0,
     product_code: 'opsxshell',
     plan_type: row.is_trial ? 'trial' : 'yearly',
     duration_days: row.is_trial ? 180 : 365,
@@ -193,7 +194,7 @@ async function submitIssue() {
     if (!valid) return
     issuing.value = true
     try {
-      const res = await issueOfflineLicense({
+      const payload = {
         device_id: form.device_id.trim(),
         email: form.email.trim() || undefined,
         customer_name: form.customer_name.trim() || undefined,
@@ -201,7 +202,11 @@ async function submitIssue() {
         duration_days: form.duration_days,
         notes: form.notes,
         product_code: form.product_code.trim() || 'opsxshell',
-      })
+      }
+      if (form.customer_id > 0) {
+        payload.customer_id = form.customer_id
+      }
+      const res = await issueOfflineLicense(payload)
       result.value = res.data
       loadData()
       ElMessage.success('已签发（请复制序列号；列表仅显示短码）')