修复了一些逻辑漏洞

internal/api/conversation_handler.go

@@ -9,6 +9,7 @@ import (
 	"xk-websocket-v2/internal/utils"
 
 	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
 )
 
 /**
@@ -119,4 +120,30 @@ func DeleteConversationHandler(c *gin.Context) {
 	utils.Success(c, "删除成功")
 }
 
+/**
+ * GetConversationByRoomHandler
+ * 功能：根据 room_id 获取或创建会话
+ * 路径：GET /api/conversations/by-room/:room_id
+ */
+func GetConversationByRoomHandler(c *gin.Context) {
+	userID, _ := c.Get("user_id")
+	roomID := c.Param("room_id")
+
+	if roomID == "" {
+		utils.BadRequest(c, "room_id 不能为空")
+		return
+	}
+
+	conv, err := service.ConversationSvc.GetOrCreateConversationByRoom(userID.(string), roomID)
+	if err != nil {
+		if err == gorm.ErrRecordNotFound {
+			utils.NotFound(c, "房间不存在或无权访问")
+		} else {
+			utils.InternalError(c, "查询失败")
+		}
+		return
+	}
+
+	utils.SuccessWithData(c, conv, "获取成功")
+}