dns-server/http/server.go

package http

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"sort"
	"strings"
	"sync"
	"time"

	"dns-server/config"
	"dns-server/dns"
	"dns-server/logger"
	"dns-server/shield"

	"github.com/gorilla/websocket"
)

// Server HTTP控制台服务器
type Server struct {
	globalConfig  *config.Config
	config        *config.HTTPConfig
	dnsServer     *dns.Server
	shieldManager *shield.ShieldManager
	server        *http.Server

	// 会话管理相关字段
	sessions      map[string]time.Time // 会话ID到过期时间的映射
	sessionsMutex sync.Mutex           // 会话映射的互斥锁
	sessionTTL    time.Duration        // 会话过期时间

	// WebSocket相关字段
	upgrader      websocket.Upgrader
	clients       map[*websocket.Conn]bool
	clientsMutex  sync.Mutex
	broadcastChan chan []byte
}

// NewServer 创建HTTP服务器实例
func NewServer(globalConfig *config.Config, dnsServer *dns.Server, shieldManager *shield.ShieldManager) *Server {
	server := &Server{
		globalConfig:  globalConfig,
		config:        &globalConfig.HTTP,
		dnsServer:     dnsServer,
		shieldManager: shieldManager,
		upgrader: websocket.Upgrader{
			ReadBufferSize:  1024,
			WriteBufferSize: 1024,
			// 允许所有CORS请求
			CheckOrigin: func(r *http.Request) bool {
				return true
			},
		},
		clients:       make(map[*websocket.Conn]bool),
		broadcastChan: make(chan []byte, 100),
		// 会话管理初始化
		sessions:   make(map[string]time.Time),
		sessionTTL: 24 * time.Hour, // 会话有效期24小时
	}

	// 启动广播协程
	go server.startBroadcastLoop()
	// 启动会话清理协程
	go server.cleanupSessionsLoop()

	return server
}

// Start 启动HTTP服务器
func (s *Server) Start() error {
	mux := http.NewServeMux()

	// 登录路由，不需要认证
	mux.HandleFunc("/login", func(w http.ResponseWriter, r *http.Request) {
		// 重定向到登录页面HTML
		http.Redirect(w, r, "/login.html", http.StatusFound)
	})

	// API路由
	if s.config.EnableAPI {
		// 登录API端点，不需要认证
		mux.HandleFunc("/api/login", s.handleLogin)

		// 重定向/api到Swagger UI页面
		mux.HandleFunc("/api", s.loginRequired(func(w http.ResponseWriter, r *http.Request) {
			http.Redirect(w, r, "/api/index.html", http.StatusMovedPermanently)
		}))

		// 注册所有API端点，应用登录中间件
		mux.HandleFunc("/api/stats", s.loginRequired(s.handleStats))
		mux.HandleFunc("/api/shield", s.loginRequired(s.handleShield))
		mux.HandleFunc("/api/shield/localrules", s.loginRequired(func(w http.ResponseWriter, r *http.Request) {
			w.Header().Set("Content-Type", "application/json")
			if r.Method == http.MethodGet {
				localRules := s.shieldManager.GetLocalRules()
				json.NewEncoder(w).Encode(localRules)
				return
			}
			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		}))
		mux.HandleFunc("/api/shield/remoterules", s.loginRequired(func(w http.ResponseWriter, r *http.Request) {
			w.Header().Set("Content-Type", "application/json")
			if r.Method == http.MethodGet {
				remoteRules := s.shieldManager.GetRemoteRules()
				json.NewEncoder(w).Encode(remoteRules)
				return
			}
			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		}))
		mux.HandleFunc("/api/shield/hosts", s.loginRequired(s.handleShieldHosts))
		mux.HandleFunc("/api/shield/blacklists", s.loginRequired(s.handleShieldBlacklists))
		mux.HandleFunc("/api/query", s.loginRequired(s.handleQuery))
		mux.HandleFunc("/api/status", s.loginRequired(s.handleStatus))
		mux.HandleFunc("/api/config", s.loginRequired(s.handleConfig))
		mux.HandleFunc("/api/config/restart", s.loginRequired(s.handleRestart))
		// 添加统计相关接口
		mux.HandleFunc("/api/top-blocked", s.loginRequired(s.handleTopBlockedDomains))
		mux.HandleFunc("/api/top-resolved", s.loginRequired(s.handleTopResolvedDomains))
		mux.HandleFunc("/api/top-clients", s.loginRequired(s.handleTopClients))
		mux.HandleFunc("/api/top-domains", s.loginRequired(s.handleTopDomains))
		mux.HandleFunc("/api/recent-blocked", s.loginRequired(s.handleRecentBlockedDomains))
		mux.HandleFunc("/api/hourly-stats", s.loginRequired(s.handleHourlyStats))
		mux.HandleFunc("/api/daily-stats", s.loginRequired(s.handleDailyStats))
		mux.HandleFunc("/api/monthly-stats", s.loginRequired(s.handleMonthlyStats))
		mux.HandleFunc("/api/query/type", s.loginRequired(s.handleQueryTypeStats))
		// 日志统计相关接口
		mux.HandleFunc("/api/logs/stats", s.loginRequired(s.handleLogsStats))
		mux.HandleFunc("/api/logs/query", s.loginRequired(s.handleLogsQuery))
		mux.HandleFunc("/api/logs/count", s.loginRequired(s.handleLogsCount))
		// WebSocket端点
		mux.HandleFunc("/ws/stats", s.loginRequired(s.handleWebSocketStats))

		// 将/api/下的静态文件服务指向static/api目录，放在最后以避免覆盖API端点
		apiFileServer := http.FileServer(http.Dir("./static/api"))
		mux.Handle("/api/", s.loginRequired(http.StripPrefix("/api", apiFileServer).ServeHTTP))
	}

	// 自定义静态文件服务处理器，用于禁用浏览器缓存，放在API路由之后
	fileServer := http.FileServer(http.Dir("./static"))

	// 单独处理login.html，不需要登录
	mux.HandleFunc("/login.html", func(w http.ResponseWriter, r *http.Request) {
		// 添加Cache-Control头，禁用浏览器缓存
		w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
		w.Header().Set("Pragma", "no-cache")
		w.Header().Set("Expires", "Thu, 01 Jan 1970 00:00:00 GMT")
		// 直接提供login.html文件
		http.ServeFile(w, r, "./static/login.html")
	})

	// 其他静态文件需要登录
	mux.HandleFunc("/", s.loginRequired(func(w http.ResponseWriter, r *http.Request) {
		// 添加Cache-Control头，禁用浏览器缓存
		w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
		w.Header().Set("Pragma", "no-cache")
		w.Header().Set("Expires", "Thu, 01 Jan 1970 00:00:00 GMT")
		// 使用StripPrefix处理路径
		http.StripPrefix("/", fileServer).ServeHTTP(w, r)
	}))

	s.server = &http.Server{
		Addr:         fmt.Sprintf("%s:%d", s.config.Host, s.config.Port),
		Handler:      mux,
		ReadTimeout:  10 * time.Second,
		WriteTimeout: 10 * time.Second,
	}

	logger.Info(fmt.Sprintf("HTTP控制台服务器启动，监听地址: %s:%d", s.config.Host, s.config.Port))
	return s.server.ListenAndServe()
}

// Stop 停止HTTP服务器
func (s *Server) Stop() {
	if s.server != nil {
		s.server.Close()
	}
	logger.Info("HTTP控制台服务器已停止")
}

// handleStats 处理统计信息请求
// @Summary 获取系统统计信息
// @Description 获取DNS服务器和Shield的统计信息
// @Tags stats
// @Accept json
// @Produce json
// @Success 200 {object} map[string]interface{} "统计信息"
// @Failure 500 {object} map[string]string "服务器内部错误"
// @Router /api/stats [get]
func (s *Server) handleStats(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	dnsStats := s.dnsServer.GetStats()
	shieldStats := s.shieldManager.GetStats()

	// 获取最常用查询类型（如果有）
	topQueryType := "-"
	maxCount := int64(0)
	if len(dnsStats.QueryTypes) > 0 {
		for queryType, count := range dnsStats.QueryTypes {
			if count > maxCount {
				maxCount = count
				topQueryType = queryType
			}
		}
	}

	// 获取活跃来源IP数量
	activeIPCount := len(dnsStats.SourceIPs)

	// 格式化平均响应时间为两位小数
	formattedResponseTime := float64(int(dnsStats.AvgResponseTime*100)) / 100

	// 构建响应数据，确保所有字段都反映服务器的真实状态
	stats := map[string]interface{}{
		"dns": map[string]interface{}{
			"Queries":           dnsStats.Queries,
			"Blocked":           dnsStats.Blocked,
			"Allowed":           dnsStats.Allowed,
			"Errors":            dnsStats.Errors,
			"LastQuery":         dnsStats.LastQuery,
			"AvgResponseTime":   formattedResponseTime,
			"TotalResponseTime": dnsStats.TotalResponseTime,
			"QueryTypes":        dnsStats.QueryTypes,
			"SourceIPs":         dnsStats.SourceIPs,
			"CpuUsage":          dnsStats.CpuUsage,
		},
		"shield":          shieldStats,
		"topQueryType":    topQueryType,
		"activeIPs":       activeIPCount,
		"avgResponseTime": formattedResponseTime,
		"cpuUsage":        dnsStats.CpuUsage,
		"time":            time.Now(),
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(stats)
}

// WebSocket相关方法

// handleWebSocketStats 处理WebSocket连接，用于实时推送统计数据
func (s *Server) handleWebSocketStats(w http.ResponseWriter, r *http.Request) {
	// 升级HTTP连接为WebSocket
	conn, err := s.upgrader.Upgrade(w, r, nil)
	if err != nil {
		logger.Error(fmt.Sprintf("WebSocket升级失败: %v", err))
		return
	}
	defer conn.Close()

	// 将新客户端添加到客户端列表
	s.clientsMutex.Lock()
	s.clients[conn] = true
	clientCount := len(s.clients)
	s.clientsMutex.Unlock()

	logger.Info(fmt.Sprintf("新WebSocket客户端连接，当前连接数: %d", clientCount))

	// 发送初始数据
	if err := s.sendInitialStats(conn); err != nil {
		logger.Error(fmt.Sprintf("发送初始数据失败: %v", err))
		return
	}

	// 定期发送更新数据
	ticker := time.NewTicker(500 * time.Millisecond) // 每500ms检查一次数据变化
	defer ticker.Stop()

	// 最后一次发送的数据快照，用于检测变化
	var lastStats map[string]interface{}

	// 保持连接并定期发送数据
	for {
		select {
		case <-ticker.C:
			// 获取最新统计数据
			currentStats := s.buildStatsData()

			// 检查数据是否有变化
			if !s.areStatsEqual(lastStats, currentStats) {
				// 数据有变化，发送更新
				data, err := json.Marshal(map[string]interface{}{
					"type": "stats_update",
					"data": currentStats,
					"time": time.Now(),
				})
				if err != nil {
					logger.Error(fmt.Sprintf("序列化统计数据失败: %v", err))
					continue
				}

				if err := conn.WriteMessage(websocket.TextMessage, data); err != nil {
					logger.Error(fmt.Sprintf("发送WebSocket消息失败: %v", err))
					return
				}

				// 更新最后发送的数据
				lastStats = currentStats
			}
		case <-r.Context().Done():
			// 客户端断开连接
			s.clientsMutex.Lock()
			delete(s.clients, conn)
			clientCount := len(s.clients)
			s.clientsMutex.Unlock()
			logger.Info(fmt.Sprintf("WebSocket客户端断开连接，当前连接数: %d", clientCount))
			return
		}
	}
}

// sendInitialStats 发送初始统计数据
func (s *Server) sendInitialStats(conn *websocket.Conn) error {
	stats := s.buildStatsData()
	data, err := json.Marshal(map[string]interface{}{
		"type": "initial_data",
		"data": stats,
		"time": time.Now(),
	})
	if err != nil {
		return err
	}
	return conn.WriteMessage(websocket.TextMessage, data)
}

// buildStatsData 构建统计数据
func (s *Server) buildStatsData() map[string]interface{} {
	dnsStats := s.dnsServer.GetStats()
	shieldStats := s.shieldManager.GetStats()

	// 获取最常用查询类型
	topQueryType := "-"
	maxCount := int64(0)
	if len(dnsStats.QueryTypes) > 0 {
		for queryType, count := range dnsStats.QueryTypes {
			if count > maxCount {
				maxCount = count
				topQueryType = queryType
			}
		}
	}

	// 获取活跃来源IP数量
	activeIPCount := len(dnsStats.SourceIPs)

	// 格式化平均响应时间
	formattedResponseTime := float64(int(dnsStats.AvgResponseTime*100)) / 100

	return map[string]interface{}{
		"dns": map[string]interface{}{
			"Queries":           dnsStats.Queries,
			"Blocked":           dnsStats.Blocked,
			"Allowed":           dnsStats.Allowed,
			"Errors":            dnsStats.Errors,
			"LastQuery":         dnsStats.LastQuery,
			"AvgResponseTime":   formattedResponseTime,
			"TotalResponseTime": dnsStats.TotalResponseTime,
			"QueryTypes":        dnsStats.QueryTypes,
			"SourceIPs":         dnsStats.SourceIPs,
			"CpuUsage":          dnsStats.CpuUsage,
		},
		"shield":          shieldStats,
		"topQueryType":    topQueryType,
		"activeIPs":       activeIPCount,
		"avgResponseTime": formattedResponseTime,
		"cpuUsage":        dnsStats.CpuUsage,
	}
}

// areStatsEqual 检查两次统计数据是否相等（用于检测变化）
func (s *Server) areStatsEqual(stats1, stats2 map[string]interface{}) bool {
	if stats1 == nil || stats2 == nil {
		return false
	}

	// 只比较关键数值，避免频繁更新
	if dns1, ok1 := stats1["dns"].(map[string]interface{}); ok1 {
		if dns2, ok2 := stats2["dns"].(map[string]interface{}); ok2 {
			// 检查主要计数器
			if dns1["Queries"] != dns2["Queries"] ||
				dns1["Blocked"] != dns2["Blocked"] ||
				dns1["Allowed"] != dns2["Allowed"] ||
				dns1["Errors"] != dns2["Errors"] {
				return false
			}
		}
	}

	return true
}

// startBroadcastLoop 启动广播循环
func (s *Server) startBroadcastLoop() {
	for message := range s.broadcastChan {
		s.clientsMutex.Lock()
		for client := range s.clients {
			if err := client.WriteMessage(websocket.TextMessage, message); err != nil {
				logger.Error(fmt.Sprintf("广播消息失败: %v", err))
				client.Close()
				delete(s.clients, client)
			}
		}
		s.clientsMutex.Unlock()
	}
}

// cleanupSessionsLoop 定期清理过期会话
func (s *Server) cleanupSessionsLoop() {
	for {
		time.Sleep(1 * time.Hour) // 每小时清理一次
		s.sessionsMutex.Lock()
		now := time.Now()
		for sessionID, expiryTime := range s.sessions {
			if now.After(expiryTime) {
				delete(s.sessions, sessionID)
			}
		}
		s.sessionsMutex.Unlock()
	}
}

// isAuthenticated 检查用户是否已认证
func (s *Server) isAuthenticated(r *http.Request) bool {
	// 从Cookie中获取会话ID
	cookie, err := r.Cookie("session_id")
	if err != nil {
		return false
	}

	sessionID := cookie.Value
	s.sessionsMutex.Lock()
	defer s.sessionsMutex.Unlock()

	// 检查会话是否存在且未过期
	expiryTime, exists := s.sessions[sessionID]
	if !exists {
		return false
	}

	if time.Now().After(expiryTime) {
		// 会话已过期，删除它
		delete(s.sessions, sessionID)
		return false
	}

	// 延长会话有效期
	s.sessions[sessionID] = time.Now().Add(s.sessionTTL)
	return true
}

// loginRequired 登录中间件
func (s *Server) loginRequired(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		// 检查是否为登录页面或登录API，允许直接访问
		if r.URL.Path == "/login" || r.URL.Path == "/api/login" {
			next.ServeHTTP(w, r)
			return
		}

		// 检查是否已认证
		if !s.isAuthenticated(r) {
			// 如果是API请求，返回401错误
			if strings.HasPrefix(r.URL.Path, "/api/") || strings.HasPrefix(r.URL.Path, "/ws/") {
				w.Header().Set("Content-Type", "application/json")
				w.WriteHeader(http.StatusUnauthorized)
				json.NewEncoder(w).Encode(map[string]string{"error": "未授权访问"})
				return
			}
			// 否则重定向到登录页面
			http.Redirect(w, r, "/login", http.StatusFound)
			return
		}

		// 已认证，继续处理请求
		next.ServeHTTP(w, r)
	}
}

// handleTopBlockedDomains 处理TOP屏蔽域名请求
func (s *Server) handleTopBlockedDomains(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	domains := s.dnsServer.GetTopBlockedDomains(10)

	// 转换为前端需要的格式
	result := make([]map[string]interface{}, len(domains))
	for i, domain := range domains {
		result[i] = map[string]interface{}{
			"domain": domain.Domain,
			"count":  domain.Count,
		}
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

// handleTopResolvedDomains 处理获取最常解析的域名请求
func (s *Server) handleTopResolvedDomains(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	domains := s.dnsServer.GetTopResolvedDomains(10)

	// 转换为前端需要的格式
	result := make([]map[string]interface{}, len(domains))
	for i, domain := range domains {
		result[i] = map[string]interface{}{
			"domain": domain.Domain,
			"count":  domain.Count,
		}
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

// handleRecentBlockedDomains 处理最近屏蔽域名请求
func (s *Server) handleRecentBlockedDomains(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	domains := s.dnsServer.GetRecentBlockedDomains(10)

	// 转换为前端需要的格式
	result := make([]map[string]interface{}, len(domains))
	for i, domain := range domains {
		result[i] = map[string]interface{}{
			"domain": domain.Domain,
			"time":   domain.LastSeen.Format("15:04:05"),
		}
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

// handleHourlyStats 处理24小时统计请求
func (s *Server) handleHourlyStats(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	hourlyStats := s.dnsServer.GetHourlyStats()

	// 生成最近24小时的数据
	now := time.Now()
	labels := make([]string, 24)
	data := make([]int64, 24)

	for i := 23; i >= 0; i-- {
		hour := now.Add(time.Duration(-i) * time.Hour)
		hourKey := hour.Format("2006-01-02-15")
		labels[23-i] = hour.Format("15:00")
		data[23-i] = hourlyStats[hourKey]
	}

	result := map[string]interface{}{
		"labels": labels,
		"data":   data,
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

// handleDailyStats 处理每日统计数据请求
func (s *Server) handleDailyStats(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// 获取每日统计数据
	dailyStats := s.dnsServer.GetDailyStats()

	// 生成过去7天的时间标签
	labels := make([]string, 7)
	data := make([]int64, 7)
	now := time.Now()

	for i := 6; i >= 0; i-- {
		t := now.AddDate(0, 0, -i)
		key := t.Format("2006-01-02")
		labels[6-i] = t.Format("01-02")
		data[6-i] = dailyStats[key]
	}

	result := map[string]interface{}{
		"labels": labels,
		"data":   data,
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

// handleMonthlyStats 处理每月统计数据请求
func (s *Server) handleMonthlyStats(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// 获取每日统计数据（用于30天视图）
	dailyStats := s.dnsServer.GetDailyStats()

	// 生成过去30天的时间标签
	labels := make([]string, 30)
	data := make([]int64, 30)
	now := time.Now()

	for i := 29; i >= 0; i-- {
		t := now.AddDate(0, 0, -i)
		key := t.Format("2006-01-02")
		labels[29-i] = t.Format("01-02")
		data[29-i] = dailyStats[key]
	}

	result := map[string]interface{}{
		"labels": labels,
		"data":   data,
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

// handleQueryTypeStats 处理查询类型统计请求
func (s *Server) handleQueryTypeStats(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// 获取DNS统计数据
	dnsStats := s.dnsServer.GetStats()

	// 转换为前端需要的格式
	result := make([]map[string]interface{}, 0, len(dnsStats.QueryTypes))
	for queryType, count := range dnsStats.QueryTypes {
		result = append(result, map[string]interface{}{
			"type":  queryType,
			"count": count,
		})
	}

	// 按计数降序排序
	sort.Slice(result, func(i, j int) bool {
		return result[i]["count"].(int64) > result[j]["count"].(int64)
	})

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

// handleTopClients 处理TOP客户端请求
func (s *Server) handleTopClients(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// 获取TOP客户端列表
	clients := s.dnsServer.GetTopClients(10)

	// 转换为前端需要的格式
	result := make([]map[string]interface{}, len(clients))
	for i, client := range clients {
		result[i] = map[string]interface{}{
			"ip":       client.IP,
			"count":    client.Count,
			"lastSeen": client.LastSeen,
		}
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(result)
}

// handleTopDomains 处理TOP域名请求
func (s *Server) handleTopDomains(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// 获取TOP被屏蔽域名
	blockedDomains := s.dnsServer.GetTopBlockedDomains(10)
	// 获取TOP已解析域名
	resolvedDomains := s.dnsServer.GetTopResolvedDomains(10)

	// 合并并去重域名统计
	domainMap := make(map[string]int64)
	for _, domain := range blockedDomains {
		domainMap[domain.Domain] += domain.Count
	}
	for _, domain := range resolvedDomains {
		domainMap[domain.Domain] += domain.Count
	}

	// 转换为切片并排序
	domainList := make([]map[string]interface{}, 0, len(domainMap))
	for domain, count := range domainMap {
		domainList = append(domainList, map[string]interface{}{
			"domain": domain,
			"count":  count,
		})
	}

	// 按计数降序排序
	sort.Slice(domainList, func(i, j int) bool {
		return domainList[i]["count"].(int64) > domainList[j]["count"].(int64)
	})

	// 返回限制数量
	if len(domainList) > 10 {
		domainList = domainList[:10]
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(domainList)
}

// handleShield 处理Shield相关操作
// @Summary 管理Shield配置
// @Description 获取或更新Shield的配置信息
// @Tags shield
// @Accept json
// @Produce json
// @Param config body map[string]interface{} false "Shield配置信息"
// @Success 200 {object} map[string]interface{} "配置信息"
// @Failure 400 {object} map[string]string "请求参数错误"
// @Failure 500 {object} map[string]string "服务器内部错误"
// @Router /api/shield [get]
// @Router /api/shield [post]
func (s *Server) handleShield(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")

	// 默认处理逻辑
	switch r.Method {
	case http.MethodGet:
		// 检查是否需要返回完整规则列表
		if r.URL.Query().Get("all") == "true" {
			// 返回完整规则数据
			rules := s.shieldManager.GetRules()
			json.NewEncoder(w).Encode(rules)
			return
		}
		// 获取规则统计信息
		stats := s.shieldManager.GetStats()
		shieldInfo := map[string]interface{}{
			"updateInterval":        s.globalConfig.Shield.UpdateInterval,
			"blockMethod":           s.globalConfig.Shield.BlockMethod,
			"blacklistCount":        len(s.globalConfig.Shield.Blacklists),
			"domainRulesCount":      stats["domainRules"],
			"domainExceptionsCount": stats["domainExceptions"],
			"regexRulesCount":       stats["regexRules"],
			"regexExceptionsCount":  stats["regexExceptions"],
			"hostsRulesCount":       stats["hostsRules"],
		}
		json.NewEncoder(w).Encode(shieldInfo)
		return
	}
	switch r.Method {
	case http.MethodPost:
		// 添加屏蔽规则
		var req struct {
			Rule string `json:"rule"`
		}

		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			http.Error(w, "Invalid request body", http.StatusBadRequest)
			return
		}

		if err := s.shieldManager.AddRule(req.Rule); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		json.NewEncoder(w).Encode(map[string]string{"status": "success"})
		return
	case http.MethodDelete:
		// 删除屏蔽规则
		var req struct {
			Rule string `json:"rule"`
		}

		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			http.Error(w, "Invalid request body", http.StatusBadRequest)
			return
		}

		if err := s.shieldManager.RemoveRule(req.Rule); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		json.NewEncoder(w).Encode(map[string]string{"status": "success"})
		return
	case http.MethodPut:
		// 重新加载规则
		if err := s.shieldManager.LoadRules(); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		json.NewEncoder(w).Encode(map[string]string{"status": "success", "message": "规则重新加载成功"})
		return
	default:
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}
}

// handleShieldBlacklists 处理黑名单相关操作
// @Summary 管理黑名单
// @Description 处理黑名单的CRUD操作，包括获取列表、添加、更新和删除黑名单
// @Tags shield
// @Accept json
// @Produce json
// @Param name path string false "黑名单名称（用于删除操作）"
// @Param blacklist body map[string]interface{} false "黑名单信息（用于添加/更新操作）"
// @Success 200 {object} map[string]interface{} "操作成功"
// @Failure 400 {object} map[string]string "请求参数错误"
// @Failure 404 {object} map[string]string "黑名单不存在"
// @Failure 500 {object} map[string]string "服务器内部错误"
// @Router /api/shield/blacklists [get]
// @Router /api/shield/blacklists [post]
// @Router /api/shield/blacklists [put]
// @Router /api/shield/blacklists/{name} [delete]
func (s *Server) handleShieldBlacklists(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")

	// 处理更新单个黑名单
	if strings.Contains(r.URL.Path, "/update") {
		if r.Method == http.MethodPost {
			// 提取黑名单URL或Name
			parts := strings.Split(r.URL.Path, "/")
			var targetURLOrName string
			for i, part := range parts {
				if part == "blacklists" && i+1 < len(parts) && parts[i+1] != "update" {
					targetURLOrName = parts[i+1]
					break
				}
			}

			if targetURLOrName == "" {
				json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "黑名单标识不能为空"})
				return
			}

			// 获取黑名单列表
			blacklists := s.shieldManager.GetBlacklists()
			var targetIndex = -1
			for i, list := range blacklists {
				if list.URL == targetURLOrName || list.Name == targetURLOrName {
					targetIndex = i
					break
				}
			}

			if targetIndex == -1 {
				json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "黑名单不存在"})
				return
			}

			// 更新时间戳
			blacklists[targetIndex].LastUpdateTime = time.Now().Format(time.RFC3339)
			// 保存更新后的黑名单列表
			s.shieldManager.UpdateBlacklist(blacklists)
			// 更新全局配置中的黑名单
			s.globalConfig.Shield.Blacklists = blacklists
			// 保存配置到文件
			if err := saveConfigToFile(s.globalConfig, "config.json"); err != nil {
				logger.Error("保存配置文件失败", "error", err)
				json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "保存配置失败"})
				return
			}
			// 重新加载规则以获取最新的远程规则
			s.shieldManager.LoadRules()

			json.NewEncoder(w).Encode(map[string]string{"status": "success"})
			return
		}
	}

	// 处理删除黑名单
	parts := strings.Split(r.URL.Path, "/")
	if len(parts) > 4 && parts[3] == "blacklists" && parts[4] != "" && r.Method == http.MethodDelete {
		id := parts[4]
		blacklists := s.shieldManager.GetBlacklists()
		var newBlacklists []config.BlacklistEntry

		for _, list := range blacklists {
			if list.URL != id && list.Name != id {
				newBlacklists = append(newBlacklists, list)
			}
		}

		s.shieldManager.UpdateBlacklist(newBlacklists)
		// 更新全局配置中的黑名单
		s.globalConfig.Shield.Blacklists = newBlacklists
		// 保存配置到文件
		if err := saveConfigToFile(s.globalConfig, "config.json"); err != nil {
			logger.Error("保存配置文件失败", "error", err)
			json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "保存配置失败"})
			return
		}
		json.NewEncoder(w).Encode(map[string]string{"status": "success"})
		return
	}

	switch r.Method {
	case http.MethodGet:
		// 获取远程黑名单列表
		blacklists := s.shieldManager.GetBlacklists()
		json.NewEncoder(w).Encode(blacklists)

	case http.MethodPost:
		// 添加远程黑名单
		var req struct {
			Name string `json:"name"`
			URL  string `json:"url"`
		}

		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "无效的请求体"})
			return
		}

		if req.Name == "" || req.URL == "" {
			json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "名称和URL不能为空"})
			return
		}

		// 获取现有黑名单
		blacklists := s.shieldManager.GetBlacklists()

		// 检查是否已存在
		for _, list := range blacklists {
			if list.URL == req.URL {
				json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "黑名单URL已存在"})
				return
			}
		}

		// 检查URL是否存在且可访问
		if !checkURLExists(req.URL) {
			json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "URL不存在或无法访问"})
			return
		}

		// 添加新黑名单
		newEntry := config.BlacklistEntry{
			Name:    req.Name,
			URL:     req.URL,
			Enabled: true,
		}

		blacklists = append(blacklists, newEntry)
		s.shieldManager.UpdateBlacklist(blacklists)
		// 更新全局配置中的黑名单
		s.globalConfig.Shield.Blacklists = blacklists
		// 保存配置到文件
		if err := saveConfigToFile(s.globalConfig, "config.json"); err != nil {
			logger.Error("保存配置文件失败", "error", err)
			json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "保存配置失败"})
			return
		}

		// 重新加载规则以获取新添加的远程规则
		s.shieldManager.LoadRules()

		json.NewEncoder(w).Encode(map[string]string{"status": "success"})

	case http.MethodPut:
		// 更新黑名单列表（包括启用/禁用状态）
		var updatedBlacklists []struct {
			Name           string `json:"Name" json:"name"`
			URL            string `json:"URL" json:"url"`
			Enabled        bool   `json:"Enabled" json:"enabled"`
			LastUpdateTime string `json:"LastUpdateTime" json:"lastUpdateTime"`
		}

		if err := json.NewDecoder(r.Body).Decode(&updatedBlacklists); err != nil {
			json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "无效的请求体"})
			return
		}

		// 转换为config.BlacklistEntry类型
		var newBlacklists []config.BlacklistEntry
		for _, entry := range updatedBlacklists {
			newBlacklists = append(newBlacklists, config.BlacklistEntry{
				Name:           entry.Name,
				URL:            entry.URL,
				Enabled:        entry.Enabled,
				LastUpdateTime: entry.LastUpdateTime,
			})
		}

		// 更新黑名单
		s.shieldManager.UpdateBlacklist(newBlacklists)
		// 更新全局配置中的黑名单
		s.globalConfig.Shield.Blacklists = newBlacklists
		// 保存配置到文件
		if err := saveConfigToFile(s.globalConfig, "config.json"); err != nil {
			logger.Error("保存配置文件失败", "error", err)
			json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "保存配置失败"})
			return
		}
		// 重新加载规则
		s.shieldManager.LoadRules()

		json.NewEncoder(w).Encode(map[string]string{"status": "success"})

	default:
		json.NewEncoder(w).Encode(map[string]string{"status": "error", "message": "Method not allowed"})
	}
}

// handleShieldHosts 处理hosts管理请求
func (s *Server) handleShieldHosts(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")

	switch r.Method {
	case http.MethodPost:
		// 添加hosts条目
		var req struct {
			IP     string `json:"ip"`
			Domain string `json:"domain"`
		}

		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			http.Error(w, "Invalid request body", http.StatusBadRequest)
			return
		}

		if req.IP == "" || req.Domain == "" {
			http.Error(w, "IP and Domain are required", http.StatusBadRequest)
			return
		}

		if err := s.shieldManager.AddHostsEntry(req.IP, req.Domain); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		json.NewEncoder(w).Encode(map[string]string{"status": "success"})

	case http.MethodDelete:
		// 删除hosts条目
		var req struct {
			Domain string `json:"domain"`
		}

		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			http.Error(w, "Invalid request body", http.StatusBadRequest)
			return
		}

		if err := s.shieldManager.RemoveHostsEntry(req.Domain); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		json.NewEncoder(w).Encode(map[string]string{"status": "success"})

	case http.MethodGet:
		// 获取hosts条目列表
		hosts := s.shieldManager.GetAllHosts()
		hostsCount := s.shieldManager.GetHostsCount()

		// 转换为数组格式，便于前端展示
		hostsList := make([]map[string]string, 0, len(hosts))
		for domain, ip := range hosts {
			hostsList = append(hostsList, map[string]string{
				"domain": domain,
				"ip":     ip,
			})
		}

		json.NewEncoder(w).Encode(map[string]interface{}{
			"hosts":      hostsList,
			"hostsCount": hostsCount,
		})

	default:
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
	}
}

// handleQuery 处理DNS查询请求
func (s *Server) handleQuery(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	domain := r.URL.Query().Get("domain")
	if domain == "" {
		http.Error(w, "Domain parameter is required", http.StatusBadRequest)
		return
	}

	// 获取域名屏蔽的详细信息
	blockDetails := s.shieldManager.CheckDomainBlockDetails(domain)

	// 添加时间戳
	blockDetails["timestamp"] = time.Now()

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(blockDetails)
}

// handleStatus 处理系统状态请求
func (s *Server) handleStatus(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	stats := s.dnsServer.GetStats()

	// 使用服务器的实际启动时间计算准确的运行时间
	serverStartTime := s.dnsServer.GetStartTime()
	uptime := time.Since(serverStartTime)

	// 构建包含所有真实服务器统计数据的响应
	status := map[string]interface{}{
		"status":          "running",
		"queries":         stats.Queries,
		"blocked":         stats.Blocked,
		"allowed":         stats.Allowed,
		"errors":          stats.Errors,
		"lastQuery":       stats.LastQuery,
		"avgResponseTime": stats.AvgResponseTime,
		"activeIPs":       len(stats.SourceIPs),
		"startTime":       serverStartTime,
		"uptime":          uptime.Milliseconds(), // 转换为毫秒数，方便前端处理
		"cpuUsage":        stats.CpuUsage,
		"timestamp":       time.Now(),
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(status)
}

// saveConfigToFile 保存配置到文件
func saveConfigToFile(config *config.Config, filePath string) error {
	data, err := json.MarshalIndent(config, "", "  ")
	if err != nil {
		return err
	}
	return ioutil.WriteFile(filePath, data, 0644)
}

// handleConfig 处理配置请求
func (s *Server) handleConfig(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")

	switch r.Method {
	case http.MethodGet:
		// 返回当前配置（包括黑名单配置）
		config := map[string]interface{}{
			"shield": map[string]interface{}{
				"blockMethod":    s.globalConfig.Shield.BlockMethod,
				"customBlockIP":  s.globalConfig.Shield.CustomBlockIP,
				"blacklists":     s.globalConfig.Shield.Blacklists,
				"updateInterval": s.globalConfig.Shield.UpdateInterval,
			},
		}
		json.NewEncoder(w).Encode(config)

	case http.MethodPost:
		// 更新配置
		var req struct {
			Shield struct {
				BlockMethod    string                  `json:"blockMethod"`
				CustomBlockIP  string                  `json:"customBlockIP"`
				Blacklists     []config.BlacklistEntry `json:"blacklists"`
				UpdateInterval int                     `json:"updateInterval"`
			} `json:"shield"`
		}

		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			http.Error(w, "无效的请求体", http.StatusBadRequest)
			return
		}

		// 更新屏蔽配置
		if req.Shield.BlockMethod != "" {
			// 验证屏蔽方法是否有效
			validMethods := map[string]bool{
				"NXDOMAIN": true,
				"refused":  true,
				"emptyIP":  true,
				"customIP": true,
			}

			if !validMethods[req.Shield.BlockMethod] {
				http.Error(w, "无效的屏蔽方法", http.StatusBadRequest)
				return
			}

			s.globalConfig.Shield.BlockMethod = req.Shield.BlockMethod

			// 如果选择了customIP，验证IP地址
			if req.Shield.BlockMethod == "customIP" {
				if req.Shield.CustomBlockIP == "" {
					http.Error(w, "自定义IP不能为空", http.StatusBadRequest)
					return
				}
				// 简单的IP地址验证
				if !isValidIP(req.Shield.CustomBlockIP) {
					http.Error(w, "无效的IP地址", http.StatusBadRequest)
					return
				}
			}
		}

		if req.Shield.CustomBlockIP != "" {
			s.globalConfig.Shield.CustomBlockIP = req.Shield.CustomBlockIP
		}

		// 更新黑名单配置
		if req.Shield.Blacklists != nil {
			// 验证黑名单配置
			for i, bl := range req.Shield.Blacklists {
				if bl.URL == "" {
					http.Error(w, fmt.Sprintf("黑名单URL不能为空，索引: %d", i), http.StatusBadRequest)
					return
				}
				if !strings.HasPrefix(bl.URL, "http://") && !strings.HasPrefix(bl.URL, "https://") {
					http.Error(w, fmt.Sprintf("黑名单URL必须以http://或https://开头，索引: %d", i), http.StatusBadRequest)
					return
				}
			}
			s.globalConfig.Shield.Blacklists = req.Shield.Blacklists
			s.shieldManager.UpdateBlacklist(req.Shield.Blacklists)
			// 重新加载规则
			if err := s.shieldManager.LoadRules(); err != nil {
				logger.Error("重新加载规则失败", "error", err)
			}
		}

		// 更新更新间隔
		if req.Shield.UpdateInterval > 0 {
			s.globalConfig.Shield.UpdateInterval = req.Shield.UpdateInterval
			// 重新启动自动更新
			s.shieldManager.StopAutoUpdate()
			s.shieldManager.StartAutoUpdate()
		}

		// 保存配置到文件
		if err := saveConfigToFile(s.globalConfig, "./config.json"); err != nil {
			logger.Error("保存配置到文件失败", "error", err)
			// 不返回错误，只记录日志，因为配置已经在内存中更新成功
		}

		// 返回成功响应
		json.NewEncoder(w).Encode(map[string]interface{}{
			"success": true,
			"message": "配置已更新",
		})

	default:
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
	}
}

// isValidIP 简单验证IP地址格式
func isValidIP(ip string) bool {
	// 简单的IPv4地址验证
	parts := strings.Split(ip, ".")
	if len(parts) != 4 {
		return false
	}

	for _, part := range parts {
		// 检查是否为数字
		for _, char := range part {
			if char < '0' || char > '9' {
				return false
			}
		}
		// 检查数字范围
		var num int
		if _, err := fmt.Sscanf(part, "%d", &num); err != nil || num < 0 || num > 255 {
			return false
		}
	}
	return true
}

// checkURLExists 检查URL是否存在且可访问
func checkURLExists(url string) bool {
	// 创建一个带有超时的HTTP客户端
	client := &http.Client{
		Timeout: 5 * time.Second,
	}

	// 发送HEAD请求来检查URL是否存在
	resp, err := client.Head(url)
	if err != nil {
		return false
	}
	defer resp.Body.Close()

	// 检查状态码，2xx和3xx表示成功
	return resp.StatusCode >= 200 && resp.StatusCode < 400
}

// handleLogsStats 处理日志统计请求
func (s *Server) handleLogsStats(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// 获取日志统计数据
	logStats := s.dnsServer.GetQueryStats()

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(logStats)
}

// handleLogsQuery 处理日志查询请求
func (s *Server) handleLogsQuery(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// 获取查询参数
	limit := 100 // 默认返回100条日志
	offset := 0
	sortField := r.URL.Query().Get("sort")
	sortDirection := r.URL.Query().Get("direction")
	resultFilter := r.URL.Query().Get("result")
	searchTerm := r.URL.Query().Get("search")

	if limitStr := r.URL.Query().Get("limit"); limitStr != "" {
		fmt.Sscanf(limitStr, "%d", &limit)
	}

	if offsetStr := r.URL.Query().Get("offset"); offsetStr != "" {
		fmt.Sscanf(offsetStr, "%d", &offset)
	}

	// 获取日志数据
	logs := s.dnsServer.GetQueryLogs(limit, offset, sortField, sortDirection, resultFilter, searchTerm)

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(logs)
}

// handleLogsCount 处理日志总数请求
func (s *Server) handleLogsCount(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// 获取日志总数
	count := s.dnsServer.GetQueryLogsCount()

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]int{"count": count})
}

// handleRestart 处理重启服务请求
func (s *Server) handleRestart(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	logger.Info("收到重启服务请求")

	// 停止DNS服务器
	s.dnsServer.Stop()

	// 重新加载屏蔽规则
	if err := s.shieldManager.LoadRules(); err != nil {
		logger.Error("重新加载屏蔽规则失败", "error", err)
	}

	// 重新启动DNS服务器
	go func() {
		if err := s.dnsServer.Start(); err != nil {
			logger.Error("DNS服务器重启失败", "error", err)
		}
	}()

	// 重新启动定时更新任务
	s.shieldManager.StopAutoUpdate()
	s.shieldManager.StartAutoUpdate()

	// 返回成功响应
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]string{"status": "success", "message": "服务已重启"})
	logger.Info("服务重启成功")
}

// handleLogin 处理登录请求
func (s *Server) handleLogin(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// 解析请求体
	var loginData struct {
		Username string `json:"username"`
		Password string `json:"password"`
	}

	if err := json.NewDecoder(r.Body).Decode(&loginData); err != nil {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusBadRequest)
		json.NewEncoder(w).Encode(map[string]string{"error": "无效的请求体"})
		return
	}

	// 验证用户名和密码
	if loginData.Username != s.config.Username || loginData.Password != s.config.Password {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusUnauthorized)
		json.NewEncoder(w).Encode(map[string]string{"error": "用户名或密码错误"})
		return
	}

	// 生成会话ID
	sessionID := fmt.Sprintf("%d_%d", time.Now().UnixNano(), len(s.sessions))

	// 保存会话
	s.sessionsMutex.Lock()
	s.sessions[sessionID] = time.Now().Add(s.sessionTTL)
	s.sessionsMutex.Unlock()

	// 设置Cookie
	cookie := &http.Cookie{
		Name:     "session_id",
		Value:    sessionID,
		Path:     "/",
		Expires:  time.Now().Add(s.sessionTTL),
		HttpOnly: true,
		Secure:   false, // 开发环境下使用false，生产环境应使用true
	}
	http.SetCookie(w, cookie)

	// 返回成功响应
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]string{"status": "success", "message": "登录成功"})
	logger.Info(fmt.Sprintf("用户 %s 登录成功", loginData.Username))
}