美化排版前端管理后台

mengyastore-backend-go/internal/handlers/admin.go

@@ -22,6 +22,36 @@ func NewAdminHandler(store *storage.ProductStore, cfg *config.Config, siteStore
 	return &AdminHandler{store: store, cfg: cfg, siteStore: siteStore, orderStore: orderStore, chatStore: chatStore}
 }
 
+// GetAnnouncement 公开获取公告内容。
+func (h *AdminHandler) GetAnnouncement(c *gin.Context) {
+	ann, err := h.siteStore.GetAnnouncement()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"data": ann})
+}
+
+// SetAnnouncement 管理员更新公告内容。
+func (h *AdminHandler) SetAnnouncement(c *gin.Context) {
+	if !h.requireAdmin(c) {
+		return
+	}
+	var payload struct {
+		Content string `json:"content"`
+	}
+	if err := c.ShouldBindJSON(&payload); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid body"})
+		return
+	}
+	if err := h.siteStore.SetAnnouncement(payload.Content); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	ann, _ := h.siteStore.GetAnnouncement()
+	c.JSON(http.StatusOK, gin.H{"data": ann})
+}
+
 // requireAdmin 校验管理员令牌。
 // 优先级：X-Admin-Token 请求头 > Authorization 请求头 > ?token 查询参数（旧版兼容）。
 func (h *AdminHandler) requireAdmin(c *gin.Context) bool {

mengyastore-backend-go/internal/storage/sitestore.go

@@ -2,6 +2,7 @@ package storage
 
 import (
 	"strconv"
+	"time"
 
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
@@ -9,6 +10,28 @@ import (
 	"mengyastore-backend/internal/database"
 )
 
+type Announcement struct {
+	Content string `json:"content"`
+	Version string `json:"version"`
+}
+
+func (s *SiteStore) GetAnnouncement() (Announcement, error) {
+	content, err := s.get("announcementContent")
+	if err != nil {
+		return Announcement{}, err
+	}
+	version, _ := s.get("announcementVersion")
+	return Announcement{Content: content, Version: version}, nil
+}
+
+func (s *SiteStore) SetAnnouncement(content string) error {
+	version := strconv.FormatInt(time.Now().UnixMilli(), 10)
+	if err := s.set("announcementContent", content); err != nil {
+		return err
+	}
+	return s.set("announcementVersion", version)
+}
+
 type SiteStore struct {
 	db *gorm.DB
 }

mengyastore-backend-go/main.go

@@ -241,6 +241,7 @@ func main() {
 	statusHandler := handlers.NewSystemStatusHandler(cfg, db, mqClient, startedAt)
 
 	// 公开路由
+	r.GET("/api/announcement", adminHandler.GetAnnouncement)
 	r.GET("/api/products", publicHandler.ListProducts)
 	r.POST("/api/checkout", orderHandler.CreateOrder)
 	r.GET("/api/orders/:id/payment-status", orderHandler.GetOrderPaymentStatus)
@@ -260,6 +261,7 @@ func main() {
 	r.PUT("/api/admin/products/:id", adminHandler.UpdateProduct)
 	r.PATCH("/api/admin/products/:id/status", adminHandler.ToggleProduct)
 	r.DELETE("/api/admin/products/:id", adminHandler.DeleteProduct)
+	r.PUT("/api/admin/announcement", adminHandler.SetAnnouncement)
 	r.POST("/api/admin/site/maintenance", adminHandler.SetMaintenance)
 	r.GET("/api/admin/site/smtp", adminHandler.GetSMTPConfig)
 	r.POST("/api/admin/site/smtp", adminHandler.SetSMTPConfig)