/*
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Copyright [2020] [https://www.xiaonuo.vip]
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Snowy采用APACHE LICENSE 2.0开源协议,您在使用过程中,需要注意以下几点:
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1.请不要删除和修改根目录下的LICENSE文件。
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2.请不要删除和修改Snowy源码头部的版权声明。
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3.请保留源码和相关描述文件的项目出处,作者声明等。
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4.分发源码时候,请注明软件出处 https://gitee.com/xiaonuobase/snowy
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5.在修改包名,模块名称,项目代码等时,请注明软件出处 https://gitee.com/xiaonuobase/snowy
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6.若您的项目无法满足以上几点,可申请商业授权,获取Snowy商业授权许可,请在官网购买授权,地址为 https://www.xiaonuo.vip
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*/
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package vip.xiaonuo.sys.core.filter.xss;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletRequestWrapper;
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/**
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* xss针对http请求的包装
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*
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* @author yubaoshan
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* @date 2020/6/21 10:29
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*/
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public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
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XssHttpServletRequestWrapper(HttpServletRequest servletRequest) {
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super(servletRequest);
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}
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@Override
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public String[] getParameterValues(String parameter) {
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String[] values = super.getParameterValues(parameter);
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if (values == null) {
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return null;
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}
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int count = values.length;
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String[] encodedValues = new String[count];
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for (int i = 0; i < count; i++) {
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encodedValues[i] = cleanXss(values[i]);
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}
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return encodedValues;
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}
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@Override
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public String getParameter(String parameter) {
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String value = super.getParameter(parameter);
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if (value == null) {
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return null;
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}
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return cleanXss(value);
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}
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@Override
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public String getHeader(String name) {
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String value = super.getHeader(name);
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if (value == null) {
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return null;
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}
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return cleanXss(value);
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}
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private String cleanXss(String value) {
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value = value.replaceAll("<", "& lt;").replaceAll(">", "& gt;");
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value = value.replaceAll("\\(", "& #40;").replaceAll("\\)", "& #41;");
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value = value.replaceAll("'", "& #39;");
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value = value.replaceAll("eval\\((.*)\\)", "");
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value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']", "\"\"");
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return value;
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}
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}
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