84 lines
3.0 KiB
C#
84 lines
3.0 KiB
C#
using System;
|
|
|
|
namespace NetCore.Common
|
|
{
|
|
/// <summary>
|
|
/// 关键词算法,有白名单算法
|
|
/// </summary>
|
|
public class KeyWordHelper
|
|
{
|
|
/// <summary>
|
|
/// 是否违规
|
|
/// </summary>
|
|
/// <param name="content"></param>
|
|
/// <param name="keyword"></param>
|
|
/// <returns></returns>
|
|
public static bool IsViolation(string content, string keyword)
|
|
{
|
|
bool result = false;
|
|
try
|
|
{
|
|
string newcontent = content.ToString();
|
|
string word = "";
|
|
string[] whitewords = { };
|
|
if (keyword.IndexOf("{") == -1)
|
|
{
|
|
word = keyword;
|
|
}
|
|
else
|
|
{
|
|
var xa = keyword.IndexOf("{");
|
|
word = keyword.Substring(0, xa);
|
|
whitewords = keyword.Substring(xa).Replace("{", "").Replace("}", "").Split(",");
|
|
}
|
|
if (content.Contains(word))
|
|
{
|
|
if (whitewords.Length == 0)//没有白名单直接返回true
|
|
{
|
|
return true;
|
|
}
|
|
int whitcount = 0;//白名单数量，要等于出现关键词的次数，才能算是全部在白名单中
|
|
int wordcount = 0;
|
|
while (newcontent.IndexOf(word) > -1)
|
|
{
|
|
wordcount++;
|
|
int i = newcontent.IndexOf(word);//关键词位置
|
|
bool needreplace = true;
|
|
foreach (var item in whitewords)
|
|
{
|
|
int mx = item.IndexOf(word);//关键词在白名单位置
|
|
if (mx == -1)
|
|
continue;//不在此白名单中
|
|
int worindex = newcontent.IndexOf(item);//白名单所在位置
|
|
if (worindex == i - mx)
|
|
{
|
|
needreplace = false;
|
|
whitcount++;
|
|
newcontent = newcontent.Substring(0, worindex) + newcontent.Substring(worindex + item.Length);//把白名单替换掉
|
|
break;
|
|
}
|
|
}
|
|
if (needreplace == true)
|
|
newcontent = newcontent.Substring(0, i) + newcontent.Substring(i + word.Length);//把白名单替换掉
|
|
}
|
|
if (whitcount == wordcount)
|
|
{
|
|
result = false;
|
|
}
|
|
else
|
|
{
|
|
result = true;
|
|
}
|
|
|
|
}
|
|
}
|
|
catch (Exception e)
|
|
{
|
|
Console.WriteLine(e.ToString());
|
|
|
|
}
|
|
return result;
|
|
}
|
|
}
|
|
}
|