302 lines
7.3 KiB
Go
302 lines
7.3 KiB
Go
package main
|
||
|
||
import (
|
||
"fmt"
|
||
"net"
|
||
"strings"
|
||
"sync"
|
||
"time"
|
||
|
||
"github.com/gin-gonic/gin"
|
||
"golang.org/x/time/rate"
|
||
)
|
||
|
||
const (
|
||
// 清理间隔
|
||
CleanupInterval = 10 * time.Minute
|
||
MaxIPCacheSize = 10000
|
||
)
|
||
|
||
// IPRateLimiter IP限流器结构体
|
||
type IPRateLimiter struct {
|
||
ips map[string]*rateLimiterEntry // IP到限流器的映射
|
||
mu *sync.RWMutex // 读写锁，保证并发安全
|
||
r rate.Limit // 速率限制（每秒允许的请求数）
|
||
b int // 令牌桶容量（突发请求数）
|
||
whitelist []*net.IPNet // 白名单IP段
|
||
blacklist []*net.IPNet // 黑名单IP段
|
||
}
|
||
|
||
// rateLimiterEntry 限流器条目
|
||
type rateLimiterEntry struct {
|
||
limiter *rate.Limiter
|
||
lastAccess time.Time
|
||
}
|
||
|
||
// initGlobalLimiter 初始化全局限流器
|
||
func initGlobalLimiter() *IPRateLimiter {
|
||
cfg := GetConfig()
|
||
|
||
whitelist := make([]*net.IPNet, 0, len(cfg.Security.WhiteList))
|
||
for _, item := range cfg.Security.WhiteList {
|
||
if item = strings.TrimSpace(item); item != "" {
|
||
if !strings.Contains(item, "/") {
|
||
item = item + "/32" // 单个IP转为CIDR格式
|
||
}
|
||
_, ipnet, err := net.ParseCIDR(item)
|
||
if err == nil {
|
||
whitelist = append(whitelist, ipnet)
|
||
} else {
|
||
fmt.Printf("警告: 无效的白名单IP格式: %s\n", item)
|
||
}
|
||
}
|
||
}
|
||
|
||
// 解析黑名单IP段
|
||
blacklist := make([]*net.IPNet, 0, len(cfg.Security.BlackList))
|
||
for _, item := range cfg.Security.BlackList {
|
||
if item = strings.TrimSpace(item); item != "" {
|
||
if !strings.Contains(item, "/") {
|
||
item = item + "/32" // 单个IP转为CIDR格式
|
||
}
|
||
_, ipnet, err := net.ParseCIDR(item)
|
||
if err == nil {
|
||
blacklist = append(blacklist, ipnet)
|
||
} else {
|
||
fmt.Printf("警告: 无效的黑名单IP格式: %s\n", item)
|
||
}
|
||
}
|
||
}
|
||
|
||
// 计算速率：将 "每N小时X个请求" 转换为 "每秒Y个请求"
|
||
ratePerSecond := rate.Limit(float64(cfg.RateLimit.RequestLimit) / (cfg.RateLimit.PeriodHours * 3600))
|
||
|
||
burstSize := cfg.RateLimit.RequestLimit
|
||
if burstSize < 1 {
|
||
burstSize = 1
|
||
}
|
||
|
||
limiter := &IPRateLimiter{
|
||
ips: make(map[string]*rateLimiterEntry),
|
||
mu: &sync.RWMutex{},
|
||
r: ratePerSecond,
|
||
b: burstSize,
|
||
whitelist: whitelist,
|
||
blacklist: blacklist,
|
||
}
|
||
|
||
// 启动定期清理goroutine
|
||
go limiter.cleanupRoutine()
|
||
|
||
return limiter
|
||
}
|
||
|
||
// initLimiter 初始化限流器
|
||
func initLimiter() {
|
||
globalLimiter = initGlobalLimiter()
|
||
}
|
||
|
||
// cleanupRoutine 定期清理过期的限流器
|
||
func (i *IPRateLimiter) cleanupRoutine() {
|
||
ticker := time.NewTicker(CleanupInterval)
|
||
defer ticker.Stop()
|
||
|
||
for range ticker.C {
|
||
now := time.Now()
|
||
expired := make([]string, 0)
|
||
|
||
// 查找过期的条目
|
||
i.mu.RLock()
|
||
for ip, entry := range i.ips {
|
||
// 如果最后访问时间超过1小时，认为过期
|
||
if now.Sub(entry.lastAccess) > 1*time.Hour {
|
||
expired = append(expired, ip)
|
||
}
|
||
}
|
||
i.mu.RUnlock()
|
||
|
||
// 如果有过期条目或者缓存过大，进行清理
|
||
if len(expired) > 0 || len(i.ips) > MaxIPCacheSize {
|
||
i.mu.Lock()
|
||
// 删除过期条目
|
||
for _, ip := range expired {
|
||
delete(i.ips, ip)
|
||
}
|
||
|
||
// 如果缓存仍然过大，全部清理
|
||
if len(i.ips) > MaxIPCacheSize {
|
||
i.ips = make(map[string]*rateLimiterEntry)
|
||
}
|
||
i.mu.Unlock()
|
||
}
|
||
}
|
||
}
|
||
|
||
// extractIPFromAddress 从地址中提取纯IP
|
||
func extractIPFromAddress(address string) string {
|
||
if host, _, err := net.SplitHostPort(address); err == nil {
|
||
return host
|
||
}
|
||
return address
|
||
}
|
||
|
||
// normalizeIPForRateLimit 标准化IP地址用于限流：IPv4保持不变，IPv6标准化为/64网段
|
||
func normalizeIPForRateLimit(ipStr string) string {
|
||
ip := net.ParseIP(ipStr)
|
||
if ip == nil {
|
||
return ipStr // 解析失败，返回原值
|
||
}
|
||
|
||
if ip.To4() != nil {
|
||
return ipStr // IPv4保持不变
|
||
}
|
||
|
||
// IPv6：标准化为 /64 网段
|
||
ipv6 := ip.To16()
|
||
for i := 8; i < 16; i++ {
|
||
ipv6[i] = 0 // 清零后64位
|
||
}
|
||
return ipv6.String() + "/64"
|
||
}
|
||
|
||
// isIPInCIDRList 检查IP是否在CIDR列表中
|
||
func isIPInCIDRList(ip string, cidrList []*net.IPNet) bool {
|
||
// 先提取纯IP地址
|
||
cleanIP := extractIPFromAddress(ip)
|
||
parsedIP := net.ParseIP(cleanIP)
|
||
if parsedIP == nil {
|
||
return false
|
||
}
|
||
|
||
for _, cidr := range cidrList {
|
||
if cidr.Contains(parsedIP) {
|
||
return true
|
||
}
|
||
}
|
||
return false
|
||
}
|
||
|
||
// GetLimiter 获取指定IP的限流器，同时返回是否允许访问
|
||
func (i *IPRateLimiter) GetLimiter(ip string) (*rate.Limiter, bool) {
|
||
// 提取纯IP地址
|
||
cleanIP := extractIPFromAddress(ip)
|
||
|
||
// 检查是否在黑名单中
|
||
if isIPInCIDRList(cleanIP, i.blacklist) {
|
||
return nil, false
|
||
}
|
||
|
||
// 检查是否在白名单中
|
||
if isIPInCIDRList(cleanIP, i.whitelist) {
|
||
return rate.NewLimiter(rate.Inf, i.b), true
|
||
}
|
||
|
||
// 标准化IP用于限流：IPv4保持不变，IPv6标准化为/64网段
|
||
normalizedIP := normalizeIPForRateLimit(cleanIP)
|
||
|
||
now := time.Now()
|
||
|
||
i.mu.RLock()
|
||
entry, exists := i.ips[normalizedIP]
|
||
i.mu.RUnlock()
|
||
|
||
if exists {
|
||
i.mu.Lock()
|
||
if entry, stillExists := i.ips[normalizedIP]; stillExists {
|
||
entry.lastAccess = now
|
||
i.mu.Unlock()
|
||
return entry.limiter, true
|
||
}
|
||
i.mu.Unlock()
|
||
}
|
||
|
||
i.mu.Lock()
|
||
if entry, exists := i.ips[normalizedIP]; exists {
|
||
entry.lastAccess = now
|
||
i.mu.Unlock()
|
||
return entry.limiter, true
|
||
}
|
||
|
||
entry = &rateLimiterEntry{
|
||
limiter: rate.NewLimiter(i.r, i.b),
|
||
lastAccess: now,
|
||
}
|
||
i.ips[normalizedIP] = entry
|
||
i.mu.Unlock()
|
||
|
||
return entry.limiter, true
|
||
}
|
||
|
||
// RateLimitMiddleware 速率限制中间件
|
||
func RateLimitMiddleware(limiter *IPRateLimiter) gin.HandlerFunc {
|
||
return func(c *gin.Context) {
|
||
// 静态文件豁免：跳过限流检查
|
||
path := c.Request.URL.Path
|
||
if path == "/" || path == "/favicon.ico" || path == "/images.html" || path == "/search.html" ||
|
||
strings.HasPrefix(path, "/public/") {
|
||
c.Next()
|
||
return
|
||
}
|
||
|
||
// 获取客户端真实IP
|
||
var ip string
|
||
|
||
// 优先尝试从请求头获取真实IP
|
||
if forwarded := c.GetHeader("X-Forwarded-For"); forwarded != "" {
|
||
// X-Forwarded-For可能包含多个IP，取第一个
|
||
ips := strings.Split(forwarded, ",")
|
||
ip = strings.TrimSpace(ips[0])
|
||
} else if realIP := c.GetHeader("X-Real-IP"); realIP != "" {
|
||
// 如果有X-Real-IP头
|
||
ip = realIP
|
||
} else if remoteIP := c.GetHeader("X-Original-Forwarded-For"); remoteIP != "" {
|
||
// 某些代理可能使用此头
|
||
ips := strings.Split(remoteIP, ",")
|
||
ip = strings.TrimSpace(ips[0])
|
||
} else {
|
||
// 回退到ClientIP方法
|
||
ip = c.ClientIP()
|
||
}
|
||
|
||
// 提取纯IP地址（去除可能存在的端口）
|
||
cleanIP := extractIPFromAddress(ip)
|
||
|
||
// 日志记录请求IP和头信息
|
||
normalizedIP := normalizeIPForRateLimit(cleanIP)
|
||
if cleanIP != normalizedIP {
|
||
fmt.Printf("请求IP: %s (提纯后: %s, 限流段: %s), X-Forwarded-For: %s, X-Real-IP: %s\n",
|
||
ip, cleanIP, normalizedIP,
|
||
c.GetHeader("X-Forwarded-For"),
|
||
c.GetHeader("X-Real-IP"))
|
||
} else {
|
||
fmt.Printf("请求IP: %s (提纯后: %s), X-Forwarded-For: %s, X-Real-IP: %s\n",
|
||
ip, cleanIP,
|
||
c.GetHeader("X-Forwarded-For"),
|
||
c.GetHeader("X-Real-IP"))
|
||
}
|
||
|
||
// 获取限流器并检查是否允许访问
|
||
ipLimiter, allowed := limiter.GetLimiter(cleanIP)
|
||
|
||
// 如果IP在黑名单中
|
||
if !allowed {
|
||
c.JSON(403, gin.H{
|
||
"error": "您已被限制访问",
|
||
})
|
||
c.Abort()
|
||
return
|
||
}
|
||
|
||
// 检查限流
|
||
if !ipLimiter.Allow() {
|
||
c.JSON(429, gin.H{
|
||
"error": "请求频率过快，暂时限制访问",
|
||
})
|
||
c.Abort()
|
||
return
|
||
}
|
||
|
||
c.Next()
|
||
}
|
||
}
|