Implementation method of C site IP access frequency restriction for a single site
- 2021-11-13 02:30:02
- OfStack
Site IP access frequency limit for a single site
using System;
using System.Collections.Generic;
using System.IO;
//using System.Linq;
using System.Web;
// <summary>
// IP Access frequency control
// </summary>
public static class IPCacheManager
{
/// <summary>
/// IP Cache set
/// </summary>
private static List<IPCacheInfo> dataList = new List<IPCacheInfo>();
private static object lockObj = new object();
/// <summary>
/// 1 Maximum number of requests in a period of time , Must be greater than or equal to 1
/// </summary>
private static int maxTimes = 3;
/// <summary>
/// 1 Length of period of time (in seconds) ) , must be greater than or equal to 1
/// </summary>
private static int partSecond = 30;
/// <summary>
/// Request rejected whether to join the number of requests
/// </summary>
private static bool isFailAddIn = false;
static IPCacheManager()
{
}
/// <summary>
/// Set time, default maxTimes=3, partSecond=30
/// </summary>
/// <param name="_maxTimes"> Maximum number of requests </param>
/// <param name="_partSecond"> Request unit time </param>
public static void SetTime(int _maxTimes, int _partSecond)
{
maxTimes = _maxTimes;
partSecond = _partSecond;
}
/// <summary>
/// Detection 1 For a period of time, IP Can the request continue if the number of requests for
/// And use
/// </summary>
/// <param name="ip"></param>
/// <returns></returns>
public static bool CheckIsAble(string ip)
{
lock (lockObj)
{
var item = dataList.Find(p => p.IP == ip);
if (item == null)
{
item = new IPCacheInfo();
item.IP = ip;
item.ReqTime.Add(DateTime.Now);
dataList.Add(item);
return true;
}
else
{
if (item.ReqTime.Count > maxTimes)
{
item.ReqTime.RemoveAt(0);
}
var nowTime = DateTime.Now;
if (isFailAddIn)
{
#region If the request is rejected, you need to join the current request
item.ReqTime.Add(nowTime);
if (item.ReqTime.Count >= maxTimes)
{
if (item.ReqTime[0].AddSeconds(partSecond) > nowTime)
{
return false;
}
else
{
return true;
}
}
else
{
return true;
}
#endregion
}
else
{
#region If the request is rejected, there is no need to join the current request
if (item.ReqTime.Count >= maxTimes)
{
if (item.ReqTime[0].AddSeconds(partSecond) > nowTime)
{
return false;
}
else
{
item.ReqTime.Add(nowTime);
return true;
}
}
else
{
item.ReqTime.Add(nowTime);
return true;
}
#endregion
}
}
}
}
}
public class IPCacheInfo
{
public string IP { get; set; }
private List<DateTime> reqTime = new List<DateTime>();
public List<DateTime> ReqTime
{
get { return this.reqTime; }
set { this.reqTime = value; }
}
}