/**
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* Copyright (c) 2018 人人开源 All rights reserved.
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*
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* https://www.renren.io
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*
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* 版权所有，侵权必究！
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*/
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package com.zt.common.servlet.xss;
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import org.apache.commons.io.IOUtils;
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import org.apache.commons.lang3.StringUtils;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.MediaType;
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import javax.servlet.ReadListener;
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import javax.servlet.ServletInputStream;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletRequestWrapper;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import java.util.LinkedHashMap;
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import java.util.Map;
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/**
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* XSS过滤处理
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*
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* @author Mark sunlightcs@gmail.com
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* @since 1.0.0
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*/
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public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
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HttpServletRequest orgRequest;
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public XssHttpServletRequestWrapper(HttpServletRequest request) {
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super(request);
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orgRequest = request;
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}
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@Override
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public ServletInputStream getInputStream() throws IOException {
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//非json类型，直接返回
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if(!MediaType.APPLICATION_JSON_VALUE.equalsIgnoreCase(super.getHeader(HttpHeaders.CONTENT_TYPE))){
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return super.getInputStream();
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}
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//为空，直接返回
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String json = IOUtils.toString(super.getInputStream(), StandardCharsets.UTF_8);
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if (StringUtils.isBlank(json)) {
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return super.getInputStream();
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}
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//xss过滤
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json = xssEncode(json);
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final ByteArrayInputStream bis = new ByteArrayInputStream(json.getBytes(StandardCharsets.UTF_8));
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return new ServletInputStream() {
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@Override
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public boolean isFinished() {
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return true;
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}
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@Override
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public boolean isReady() {
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return true;
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}
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@Override
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public void setReadListener(ReadListener readListener) {
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}
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@Override
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public int read() {
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return bis.read();
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}
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};
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}
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@Override
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public String getParameter(String name) {
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String value = super.getParameter(xssEncode(name));
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if (StringUtils.isNotBlank(value)) {
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value = xssEncode(value);
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}
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return value;
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}
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@Override
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public String[] getParameterValues(String name) {
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String[] parameters = super.getParameterValues(name);
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if (parameters == null || parameters.length == 0) {
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return null;
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}
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for (int i = 0; i < parameters.length; i++) {
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parameters[i] = xssEncode(parameters[i]);
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}
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return parameters;
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}
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@Override
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public Map<String,String[]> getParameterMap() {
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Map<String,String[]> map = new LinkedHashMap<>();
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Map<String,String[]> parameters = super.getParameterMap();
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for (String key : parameters.keySet()) {
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String[] values = parameters.get(key);
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for (int i = 0; i < values.length; i++) {
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values[i] = xssEncode(values[i]);
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}
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map.put(key, values);
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}
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return map;
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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(xssEncode(name));
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if (StringUtils.isNotBlank(value)) {
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value = xssEncode(value);
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}
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return value;
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}
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private String xssEncode(String input) {
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return XssUtils.filter(input);
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}
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/**
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* 获取最原始的request
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*/
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public HttpServletRequest getOrgRequest() {
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return orgRequest;
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}
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/**
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* 获取最原始的request
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*/
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public static HttpServletRequest getOrgRequest(HttpServletRequest request) {
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if (request instanceof XssHttpServletRequestWrapper) {
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return ((XssHttpServletRequestWrapper) request).getOrgRequest();
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}
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return request;
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}
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}
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