隱藏手機號、郵箱等敏感信息

Intro

做項目的時候，頁面上有一些敏感信息，需要用“*”隱藏一些比較重要的信息，於是打算寫一個通用的方法。

Let's do it !

Method 1:指定左右字元數量

Method 1.1 中間的*的個數和實際長度有關

 1     /// <summary>
 2     /// 隱藏敏感信息
 3     /// </summary>
 4     /// <param name="info">信息實體</param>
 5     /// <param name="left">左邊保留的字元數</param>
 6     /// <param name="right">右邊保留的字元數</param>
 7     /// <param name="basedOnLeft">當長度異常時，是否顯示左邊 
 8     /// <code>true</code>顯示左邊，<code>false</code>顯示右邊
 9     /// </param>
10     /// <returns></returns>
11     public static string HideSensitiveInfo(string info, int left, int right, bool basedOnLeft=true)
12     {
13         if (String.IsNullOrEmpty(info))
14         {
15             return "";
16         }
17         StringBuilder sbText = new StringBuilder();
18         int hiddenCharCount = info.Length - left - right;
19         if (hiddenCharCount > 0)
20         {
21             string prefix = info.Substring(0, left), suffix = info.Substring(info.Length - right);
22             sbText.Append(prefix);
23             for (int i = 0; i < hiddenCharCount; i++)
24             {
25                 sbText.Append("*");
26             }
27             sbText.Append(suffix);
28         }
29         else
30         {
31             if (basedOnLeft)
32             {
33                 if (info.Length > left && left > 0)
34                 {
35                     sbText.Append(info.Substring(0, left) + "****");
36                 }
37                 else
38                 {
39                     sbText.Append(info.Substring(0, 1) + "****");
40                 }
41             }
42             else
43             {
44                 if (info.Length > right && right > 0)
45                 {
46                     sbText.Append("****" + info.Substring(info.Length - right));
47                 }
48                 else
49                 {
50                     sbText.Append("****" + info.Substring(info.Length - 1));
51                 }
52             }
53         }
54         return sbText.ToString();
55     }

Method 1.2 : 中間的*的個數固定

 1     /// <summary>
 2     /// 隱藏敏感信息
 3     /// </summary>
 4     /// <param name="info">信息實體</param>
 5     /// <param name="left">左邊保留的字元數</param>
 6     /// <param name="right">右邊保留的字元數</param>
 7     /// <param name="basedOnLeft">當長度異常時，是否顯示左邊 
 8     /// <code>true</code>顯示左邊，<code>false</code>顯示右邊
 9     /// <returns></returns>
10     public static string HideSensitiveInfo1(string info, int left, int right, bool basedOnLeft = true)
11     {
12         if (String.IsNullOrEmpty(info))
13         {
14             return "";
15         }
16         StringBuilder sbText = new StringBuilder();
17         int hiddenCharCount = info.Length - left - right;
18         if (hiddenCharCount > 0)
19         {
20             string prefix = info.Substring(0, left), suffix = info.Substring(info.Length - right);
21             sbText.Append(prefix);
22             sbText.Append("****");
23             sbText.Append(suffix);
24         }
25         else
26         {
27             if (basedOnLeft)
28             {
29                 if (info.Length > left && left >0)
30                 {
31                     sbText.Append(info.Substring(0, left) + "****");
32                 }
33                 else
34                 {
35                     sbText.Append(info.Substring(0, 1) + "****");
36                 }
37             }
38             else
39             {
40                 if (info.Length > right && right>0)
41                 {
42                     sbText.Append("****" + info.Substring(info.Length - right));
43                 }
44                 else
45                 {
46                     sbText.Append("****" + info.Substring(info.Length - 1));
47                 }
48             }
49         }
50         return sbText.ToString();
51     }

Method 2 : “*”數量一定，設置為4個，按信息總長度的比例來取，預設左右各取1/3

 1     /// <summary>
 2     /// 隱藏敏感信息
 3     /// </summary>
 4     /// <param name="info">信息</param>
 5     /// <param name="sublen">信息總長與左子串（或右子串）的比例</param>
 6     /// <param name="basedOnLeft">當長度異常時，是否顯示左邊，預設true，預設顯示左邊
 7     /// <code>true</code>顯示左邊，<code>false</code>顯示右邊
 8     /// <returns></returns>
 9     public static string HideSensitiveInfo(string info,int sublen = 3,bool basedOnLeft = true)
10     {
11         if (String.IsNullOrEmpty(info))
12         {
13             return "";
14         }
15         if (sublen<=1)
16         {
17             sublen = 3;
18         }
19         int subLength = info.Length / sublen;
20         if (subLength > 0 && info.Length > (subLength*2) )
21         {
22             string prefix = info.Substring(0, subLength), suffix = info.Substring(info.Length - subLength);
23             return prefix + "****" + suffix;
24         }
25         else
26         {
27             if (basedOnLeft)
28             {
29                 string prefix = subLength > 0 ? info.Substring(0, subLength) : info.Substring(0, 1);
30                 return prefix + "****";
31             }
32             else
33             {
34                 string suffix = subLength > 0 ? info.Substring(info.Length-subLength) : info.Substring(info.Length-1);
35                 return "****"+suffix;
36             }
37         }
38     }

擴展

手機號 1

 1     /// <summary>
 2     /// 隱藏手機號詳情
 3     /// </summary>
 4     /// <param name="phone">手機號</param>
 5     /// <param name="left">左邊保留字元數</param>
 6     /// <param name="right">右邊保留字元數</param>
 7     /// <returns></returns>
 8     public static string HideTelDetails(string phone, int left = 3, int right = 4)
 9     {
10         return HideSensitiveInfo(phone, left, right);
11     }

測試結果如下：

手機號 2

 1     /// <summary>
 2     /// 隱藏手機號詳情
 3     /// </summary>
 4     /// <param name="phone">手機號</param>
 5     /// <param name="left">左邊保留字元數</param>
 6     /// <param name="right">右邊保留字元數</param>
 7     /// <returns></returns>
 8     public static string HideTelDetails(string phone, int left = 3, int right = 4)
 9     {
10         return HideSensitiveInfo1(phone, left, right);
11     }

測試結果如下：

郵件地址

 1     /// <summary>
 2     /// 隱藏右鍵詳情
 3     /// </summary>
 4     /// <param name="email">郵件地址</param>
 5     /// <param name="left">郵件頭保留字元個數，預設值設置為3</param>
 6     /// <returns></returns>
 7     public static string HideEmailDetails(string email, int left = 3)
 8     {
 9         if (String.IsNullOrEmpty(email))
10         {
11             return "";
12         }
13         if (System.Text.RegularExpressions.Regex.IsMatch(email, @"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"))//如果是郵件地址
14         {
15             int suffixLen =email.Length - email.LastIndexOf('@');
16             return HideSensitiveInfo(email, left, suffixLen,false);
17         }
18         else
19         {
20             return HideSensitiveInfo(email);
21         }
22     }

測試結果如下：