package com.xcong.excoin.common.xss;
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import org.apache.commons.lang3.BooleanUtils;
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import org.apache.commons.lang3.StringUtils;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import javax.servlet.*;
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import javax.servlet.http.HttpServletRequest;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* Xss攻击拦截器
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*
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* @author MrBird
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*/
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public class XssFilter implements Filter {
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private static Logger logger = LoggerFactory.getLogger(XssFilter.class);
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/**
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* 是否过滤富文本内容
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*/
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private boolean flag = false;
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private List<String> excludes = new ArrayList<>();
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@Override
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public void init(FilterConfig filterConfig) {
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logger.info("------------ xss filter init ------------");
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String isIncludeRichText = filterConfig.getInitParameter("isIncludeRichText");
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if (StringUtils.isNotBlank(isIncludeRichText)) {
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flag = BooleanUtils.toBoolean(isIncludeRichText);
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}
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String temp = filterConfig.getInitParameter("excludes");
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if (temp != null) {
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String[] url = temp.split(",");
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excludes.addAll(Arrays.asList(url));
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}
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}
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@Override
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public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
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throws IOException, ServletException {
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HttpServletRequest req = (HttpServletRequest) request;
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if (handleExcludeUrl(req)) {
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chain.doFilter(request, response);
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return;
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}
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XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper((HttpServletRequest) request, flag);
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chain.doFilter(xssRequest, response);
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}
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@Override
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public void destroy() {
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// do nothing
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}
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private boolean handleExcludeUrl(HttpServletRequest request) {
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if (excludes == null || excludes.isEmpty()) {
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return false;
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}
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String url = request.getServletPath();
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return excludes.stream().map(pattern -> Pattern.compile("^" + pattern)).map(p -> p.matcher(url)).anyMatch(Matcher::find);
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}
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}
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