C#隐藏手机号、邮箱等敏感信息的实现方法

2020-01-24 00:59:51

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Intro

做项目的时候，页面上有一些敏感信息，需要用“*”隐藏一些比较重要的信息，于是打算写一个通用的方法。

Let's do it !

Method 1:指定左右字符数量

Method 1.1 中间的*的个数和实际长度有关

/// <summary>/// 隐藏敏感信息/// </summary>/// <param name="info">信息实体</param>/// <param name="left">左边保留的字符数</param>/// <param name="right">右边保留的字符数</param>/// <param name="basedOnLeft">当长度异常时，是否显示左边 /// <code>true</code>显示左边，<code>false</code>显示右边/// </param>/// <returns></returns>public static string HideSensitiveInfo(string info, int left, int right, bool basedOnLeft=true){if (String.IsNullOrEmpty(info)){return "";}StringBuilder sbText = new StringBuilder();int hiddenCharCount = info.Length - left - right;if (hiddenCharCount > 0){string prefix = info.Substring(0, left), suffix = info.Substring(info.Length - right);sbText.Append(prefix);for (int i = 0; i < hiddenCharCount; i++){sbText.Append("*");}sbText.Append(suffix);}else{if (basedOnLeft){if (info.Length > left && left > 0){sbText.Append(info.Substring(0, left) + "****");}else{sbText.Append(info.Substring(0, 1) + "****");}}else{if (info.Length > right && right > 0){sbText.Append("****" + info.Substring(info.Length - right));}else{sbText.Append("****" + info.Substring(info.Length - 1));}}}return sbText.ToString();}

Method 1.2 : 中间的*的个数固定

/// <summary>/// 隐藏敏感信息/// </summary>/// <param name="info">信息实体</param>/// <param name="left">左边保留的字符数</param>/// <param name="right">右边保留的字符数</param>/// <param name="basedOnLeft">当长度异常时，是否显示左边 /// <code>true</code>显示左边，<code>false</code>显示右边/// <returns></returns>public static string HideSensitiveInfo1(string info, int left, int right, bool basedOnLeft = true){if (String.IsNullOrEmpty(info)){return "";}StringBuilder sbText = new StringBuilder();int hiddenCharCount = info.Length - left - right;if (hiddenCharCount > 0){string prefix = info.Substring(0, left), suffix = info.Substring(info.Length - right);sbText.Append(prefix);sbText.Append("****");sbText.Append(suffix);}else{if (basedOnLeft){if (info.Length > left && left >0){sbText.Append(info.Substring(0, left) + "****");}else{sbText.Append(info.Substring(0, 1) + "****");}}else{if (info.Length > right && right>0){sbText.Append("****" + info.Substring(info.Length - right));}else{sbText.Append("****" + info.Substring(info.Length - 1));}}}return sbText.ToString();}

Method 2 : “*”数量一定，设置为4个，按信息总长度的比例来取，默认左右各取1/3

/// <summary>/// 隐藏敏感信息/// </summary>/// <param name="info">信息</param>/// <param name="sublen">信息总长与左子串（或右子串）的比例</param>/// <param name="basedOnLeft">当长度异常时，是否显示左边，默认true，默认显示左边/// <code>true</code>显示左边，<code>false</code>显示右边/// <returns></returns>public static string HideSensitiveInfo(string info,int sublen = 3,bool basedOnLeft = true){if (String.IsNullOrEmpty(info)){return "";}if (sublen<=1){sublen = 3;}int subLength = info.Length / sublen;if (subLength > 0 && info.Length > (subLength*2) ){string prefix = info.Substring(0, subLength), suffix = info.Substring(info.Length - subLength);return prefix + "****" + suffix;}else{if (basedOnLeft){string prefix = subLength > 0 ? info.Substring(0, subLength) : info.Substring(0, 1);return prefix + "****";}else{string suffix = subLength > 0 ? info.Substring(info.Length-subLength) : info.Substring(info.Length-1);return "****"+suffix;}}}

扩展

手机号 1

/// <summary>/// 隐藏手机号详情/// </summary>/// <param name="phone">手机号</param>/// <param name="left">左边保留字符数</param>/// <param name="right">右边保留字符数</param>/// <returns></returns>public static string HideTelDetails(string phone, int left = 3, int right = 4){return HideSensitiveInfo(phone, left, right);}

测试结果如下：

手机号 2

/// <summary>/// 隐藏手机号详情/// </summary>/// <param name="phone">手机号</param>/// <param name="left">左边保留字符数</param>/// <param name="right">右边保留字符数</param>/// <returns></returns>public static string HideTelDetails(string phone, int left = 3, int right = 4){return HideSensitiveInfo1(phone, left, right);}

测试结果如下：

邮件地址

/// <summary>/// 隐藏右键详情/// </summary>/// <param name="email">邮件地址</param>/// <param name="left">邮件头保留字符个数，默认值设置为3</param>/// <returns></returns>public static string HideEmailDetails(string email, int left = 3){if (String.IsNullOrEmpty(email)){return "";}if (System.Text.RegularExpressions.Regex.IsMatch(email, @"/w+([-+.]/w+)*@/w+([-.]/w+)*/./w+([-.]/w+)*"))//如果是邮件地址{int suffixLen =email.Length - email.LastIndexOf('@');return HideSensitiveInfo(email, left, suffixLen,false);}else{return HideSensitiveInfo(email);}}

测试结果如下：