refactor: 重构项目结构，迁移后端至 mengyastore-backend-go，新增 Java 后端、前端功能更新及部署文档

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

@@ -0,0 +1,82 @@
+package handlers
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+
+	"mengyastore-backend/internal/auth"
+	"mengyastore-backend/internal/storage"
+)
+
+type ChatHandler struct {
+	chatStore  *storage.ChatStore
+	authClient *auth.SproutGateClient
+}
+
+func NewChatHandler(chatStore *storage.ChatStore, authClient *auth.SproutGateClient) *ChatHandler {
+	return &ChatHandler{chatStore: chatStore, authClient: authClient}
+}
+
+func (h *ChatHandler) requireChatUser(c *gin.Context) (account, name string, ok bool) {
+	authHeader := c.GetHeader("Authorization")
+	if authHeader == "" || !strings.HasPrefix(authHeader, "Bearer ") {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "请先登录"})
+		return "", "", false
+	}
+	token := strings.TrimPrefix(authHeader, "Bearer ")
+	result, err := h.authClient.VerifyToken(token)
+	if err != nil || !result.Valid || result.User == nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "登录已过期，请重新登录"})
+		return "", "", false
+	}
+	return result.User.Account, result.User.Username, true
+}
+
+// GetMyMessages 返回当前登录用户的全部聊天消息。
+func (h *ChatHandler) GetMyMessages(c *gin.Context) {
+	account, _, ok := h.requireChatUser(c)
+	if !ok {
+		return
+	}
+	msgs, err := h.chatStore.GetMessages(account)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"data": gin.H{"messages": msgs}})
+}
+
+type chatMessagePayload struct {
+	Content string `json:"content"`
+}
+
+// SendMyMessage 向管理员发送一条用户消息。
+func (h *ChatHandler) SendMyMessage(c *gin.Context) {
+	account, name, ok := h.requireChatUser(c)
+	if !ok {
+		return
+	}
+	var payload chatMessagePayload
+	if err := c.ShouldBindJSON(&payload); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数有误"})
+		return
+	}
+	content := strings.TrimSpace(payload.Content)
+	if content == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "消息不能为空"})
+		return
+	}
+
+	msg, rateLimited, err := h.chatStore.SendUserMessage(account, name, content)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	if rateLimited {
+		c.JSON(http.StatusTooManyRequests, gin.H{"error": "发送太频繁，请稍候"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"data": gin.H{"message": msg}})
+}