Cache 判断Ip几分钟内攻击次数

要做一个防止一个Ip攻击网站的功能,想到了使用Cache,里面有Add  和  Insert方法。方法中有很多参数，他是以key-Value 方式存储，区别在于，Add方法一旦创建，里面的数据不可以修改。Inset 可以key不变修改 value参数。

设计思路是这样的，key为ip，value 为次数。代码如下：

 1  /// <summary>
 2         /// 获取当前应用程序指定CacheKey的Cache值
 3         /// </summary>
 4         /// <param name="CacheKey"></param>
 5         /// <returns></returns>
 6         public static object GetCache(string CacheKey)
 7         {
 8             System.Web.Caching.Cache objCache = HttpRuntime.Cache;
 9             return objCache[CacheKey];
10         }
11
12         /// <summary>
13         /// 设置当前应用程序指定CacheKey的Cache值
14         /// </summary>
15         /// <param name="CacheKey"></param>
16         /// <param name="objObject"></param>
17         /// <param name="m">分钟</param>
18         public static void SetCache(string CacheKey, object objObject, int m)
19         {
20             System.Web.Caching.Cache objCache = HttpRuntime.Cache;
21             objCache.Insert(CacheKey, objObject, null, DateTime.Now.AddMinutes(m), Cache.NoSlidingExpiration);
22         }
23         /// <summary>
24         ///
25         /// </summary>
26         /// <param name="ip"></param>
27         /// <param name="duration">时常（分钟）</param>
28         /// <param name="count"> 访问量最大阀门值</param>
29         /// <returns></returns>
30         public static bool IpConfig(string ip, int duration = 1, int count = 10)
31         {
32             bool result = false;
33             string urlIndex = "~/css/IpConfig.xml";
34             string FileName = System.Web.HttpContext.Current.Server.MapPath(urlIndex);
35             XDocument doc = XDocument.Load(FileName);
36
37             var rel = from p in doc.Descendants("item") where p.Attribute("ip").Value.ToLower() == ip select p;
38             result = (rel != null && rel.Count() > 0) ? true : false;
39             if (!result)
40             {
41                 object obj = null;
42                 if (string.IsNullOrWhiteSpace(ip)) { result = true; }
43                 else
44                 {
45                     obj = GetCache(ip);
46                     if (obj != null)
47                     {
48                         int _count = (int)obj;
49                         if (_count >= count)
50                         {
51                             if (_count == count)
52                             {
53                                 insertIP(ip);
54                                 sendmobile(ip);
55                             }
56                             return true;
57                         }
58                         else
59                         {
60                             System.Web.Caching.Cache objCache = HttpRuntime.Cache;
61                             objCache.Insert(ip, _count + 1, null, DateTime.Now.AddSeconds(duration), Cache.NoSlidingExpiration);
62                         }
63                     }
64                     else
65                     {
66                         SetCache(ip, 1, duration);
67                     }
68                 }
69             }
70             return result;
71         }
72
73
74         #region 将IP插入到XML中
75         public static void insertIP(string ip)
76         {
77             string urlIndex = "~/css/IpConfig.xml";
78             string FileName = System.Web.HttpContext.Current.Server.MapPath(urlIndex);
79             XmlDocument xmlDoc = new XmlDocument();
80             xmlDoc.Load(FileName);
81             XmlNode root = xmlDoc.SelectSingleNode("root");
82             XmlNode root0 = root.ChildNodes.Item(0);
83             XmlElement xe1 = xmlDoc.CreateElement("item");
84             xe1.SetAttribute("ip", ip);
85
86             root0.AppendChild(xe1);
87             xmlDoc.Save(FileName);
88         }
89         #endregion
90
91