DotNet隐藏敏感信息操作方法

在项目中,有时候一些信息不便完全显示,只需要显示部分信息。现在提供一些隐藏敏感信息的操作方法,主要为对信息的截取操作:

1.指定左右字符数量,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))
{
throw new ArgumentNullException(info);
}
var sbText = new StringBuilder();
var hiddenCharCount = info.Length - left - right;
if (hiddenCharCount > )
{
string prefix = info.Substring(, left), suffix = info.Substring(info.Length - right);
sbText.Append(prefix);
for (var i = ; i < hiddenCharCount; i++)
{
sbText.Append("*");
}
sbText.Append(suffix);
}
else
{
if (basedOnLeft)
{
if (info.Length > left && left > )
{
sbText.Append(info.Substring(, left) + "****");
}
else
{
sbText.Append(info.Substring(, ) + "****");
}
}
else
{
if (info.Length > right && right > )
{
sbText.Append("****" + info.Substring(info.Length - right));
}
else
{
sbText.Append("****" + info.Substring(info.Length - ));
}
}
}
return sbText.ToString();
}

2.指定左右字符数量,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))
{
throw new ArgumentNullException(info);
}
var sbText = new StringBuilder();
var hiddenCharCount = info.Length - left - right;
if (hiddenCharCount > )
{
string prefix = info.Substring(, left), suffix = info.Substring(info.Length - right);
sbText.Append(prefix);
sbText.Append("****");
sbText.Append(suffix);
}
else
{
if (basedOnLeft)
{
if (info.Length > left && left > )
{
sbText.Append(info.Substring(, left) + "****");
}
else
{
sbText.Append(info.Substring(, ) + "****");
}
}
else
{
if (info.Length > right && right > )
{
sbText.Append("****" + info.Substring(info.Length - right));
}
else
{
sbText.Append("****" + info.Substring(info.Length - ));
}
}
}
return sbText.ToString();
}

3.“*”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 = , bool basedOnLeft = true)
{
if (string.IsNullOrEmpty(info))
{
throw new ArgumentNullException(info);
}
if (sublen <= )
{
sublen = ;
}
var subLength = info.Length / sublen;
if (subLength > && info.Length > (subLength * ))
{
string prefix = info.Substring(, subLength), suffix = info.Substring(info.Length - subLength);
return prefix + "****" + suffix;
}
if (basedOnLeft)
{
var prefix = subLength > ? info.Substring(, subLength) : info.Substring(, );
return prefix + "****";
}
var suffixs = subLength > ? info.Substring(info.Length - subLength) : info.Substring(info.Length - );
return "****" + suffixs;
}

4.隐藏右键详情

        /// <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 = )
{
if (string.IsNullOrEmpty(email))
{
throw new ArgumentNullException(email);
}
if (!System.Text.RegularExpressions.Regex.IsMatch(email, @"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"))
return HideSensitiveInfo(email);
var suffixLen = email.Length - email.LastIndexOf('@');
return HideSensitiveInfo(email, left, suffixLen, false);
}

在一些信息的隐藏操作,可以采用js实现,也可以采用jquery插件完成操作,但是在前台进行这样的操作,存在一些风险,在后台完成对字符的信息截取,可以很好的对信息进行保护。

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