96 lines
3.0 KiB
C#
96 lines
3.0 KiB
C#
using System;
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namespace AyaNova.Util
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{
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internal static class StringUtil
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{
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/// <summary>
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/// Extract string between tokens
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/// </summary>
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/// <param name="s"></param>
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/// <param name="openTag"></param>
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/// <param name="closeTag"></param>
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/// <returns></returns>
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public static string Extract(string s, string openTag, string closeTag)
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{
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int startIndex = s.IndexOf(openTag);
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if (startIndex == -1)
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throw new System.IndexOutOfRangeException("ExtractString->Error: open tag not found");
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startIndex += openTag.Length;
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int endIndex = s.IndexOf(closeTag, startIndex);
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if (endIndex == -1)
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throw new System.IndexOutOfRangeException("ExtractString->Error: closing tag not found");
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return s.Substring(startIndex, endIndex - startIndex);
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}
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/// <summary>
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/// Trim a string if necessary
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/// </summary>
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/// <param name="s"></param>
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/// <param name="maxLength"></param>
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/// <returns></returns>
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public static string MaxLength(string s, int maxLength)
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{
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if (s.Length > maxLength)
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s = s.Substring(0, maxLength);
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return s;
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}
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/// <summary>
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/// mask the exact ip address by substituting the last position of the address with XXX
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/// Works with v6 or v4 addresses as strings
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/// </summary>
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/// <param name="sIP"></param>
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/// <returns></returns>
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public static string MaskIPAddress(string sIP)
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{
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//My test station ip address!?
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//"::ffff:127.0.0.1"
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//weird dual format, new method that covers both v4 and v4 inside v6 format
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if(sIP.Contains("."))
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{
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//new algorithm, replace anything after last period with an xxx
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var ret=sIP.Substring(0,sIP.LastIndexOf("."))+".xxx";
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return ret;
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}
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//8 groups IPV6 Address format
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if (sIP.Contains(":"))
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{
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sIP=sIP.Replace("::",":0:");//rehydrate "compressed" addresses
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var segs = sIP.Split(':');
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if (segs.Length < 7)
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return "UNRECOGNIZED V6 IP ADDRESS FORMAT";
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else
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return segs[0] + ":" + segs[1] + ":" + segs[2] + ":" + segs[3] + ":" + segs[4] + ":" + segs[5] + ":" + segs[6] + ":" + segs[7] + ":xxxx";
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}
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// //4 groups IPV4 Address format
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// if (sIP.Contains("."))
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// {
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// //8 groups IPV6 Address format
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// var segs = sIP.Split('.');
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// if (segs.Length < 3)
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// return "UNRECOGNIZED V4 IP ADDRESS FORMAT";
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// else
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// return segs[0] + "." + segs[1] + "." + segs[2] + ".xxx";
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// }
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return "UNRECOGNIZED IP ADDDRESS FORMAT";
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}
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}//eoc
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}//eons |