防止解决XSS注入攻击的过滤器filter XssHttpServletRequestWrapper

前段时间，博主在帮忙朋友给一个国营单位做的一个项目中，在上线的前期，客户要求检测漏洞，因此找到了专业的测评公司，测出来好多漏洞，其中就有xss攻击，我讲自己处理的方式分享给大家，便于大家少走弯路。

package com.yl.filter;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

import org.springframework.beans.factory.parsing.ReaderEventListener;


public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
    boolean isUpData = false;//判断是否是上传 上传忽略
    public XssHttpServletRequestWrapper(HttpServletRequest servletRequest) {
        super(servletRequest);
        String contentType = servletRequest.getContentType ();
        if (null != contentType)
            isUpData =contentType.startsWith ("multipart");
    }

    @Override
    public String[] getParameterValues(String parameter) {
        String[] values = super.getParameterValues(parameter);
        if (values==null)  {
            return null;
        }
        int count = values.length;
        String[] encodedValues = new String[count];
        for (int i = 0; i < count; i++) {
            encodedValues[i] = cleanXSS(values[i]);
        }
        return encodedValues;
    }
    
    @Override
    public String getParameter(String parameter) {
        String value = super.getParameter(parameter);
        if (value == null) {
            return null;
        }
        return cleanXSS(value);
    }

    /**
     * 获取request的属性时，做xss过滤
     */
    @Override
    public Object getAttribute(String name) {
        Object value = super.getAttribute(name);
        if (null != value && value instanceof String) {
            value = cleanXSS((String) value);
        }
        return value;
    }

    @Override
    public String getHeader(String name) {

        String value = super.getHeader(name);
        if (value == null)
            return null;
        return cleanXSS(value);
    }
    private  static  String cleanXSS(String value) {
        value = value.replaceAll("<", "&lt;").replaceAll(">", "&gt;");
        value = value.replaceAll("%3C", "&lt;").replaceAll("%3E", "&gt;");
        value = value.replaceAll("\\(", "&#40;").replaceAll("\\)", "&#41;");
        value = value.replaceAll("%28", "&#40;").replaceAll("%29", "&#41;");
        value = value.replaceAll("'", "&#39;");
        value = value.replaceAll("eval\\((.*)\\)", "");
        value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']", "\"\"");
        value = value.replaceAll("script", "");
        return value;
    }


    @Override
    public ServletInputStream getInputStream () throws IOException {
        if (isUpData){
            return super.getInputStream ();
        }else{

            final ByteArrayInputStream bais = new ByteArrayInputStream(inputHandlers(super.getInputStream ()).getBytes ());

            return new ServletInputStream() {

                @Override
                public int read() throws IOException {
                    return bais.read();
                }

                public boolean isFinished() {
                    return false;
                }

                public boolean isReady() {
                    return false;
                }

                public void setReadListener(ReaderEventListener readListener) { }
            };
      }

    }
    public   String inputHandlers(ServletInputStream servletInputStream){
        StringBuilder sb = new StringBuilder();
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new InputStreamReader (servletInputStream, Charset.forName("UTF-8")));
            String line = "";
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (servletInputStream != null) {
                try {
                    servletInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return  cleanXSS(sb.toString ());
    }
}

 注意： 标注有上传的地方一定要注意，不能省略掉，否则上传就会有问题，我们当初处理xss攻击时候，忘记管上传了，结果后期在上线阶段上传文件不起作用。