package com.jcdm.common.filter;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.FilterConfig;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import com.jcdm.common.utils.StringUtils;
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import com.jcdm.common.enums.HttpMethod;
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/**
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* 防止XSS攻击的过滤器
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*
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* @author jc
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*/
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public class XssFilter implements Filter
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{
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/**
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* 排除链接
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*/
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public List<String> excludes = new ArrayList<>();
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@Override
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public void init(FilterConfig filterConfig) throws ServletException
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{
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String tempExcludes = filterConfig.getInitParameter("excludes");
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if (StringUtils.isNotEmpty(tempExcludes))
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{
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String[] url = tempExcludes.split(",");
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for (int i = 0; url != null && i < url.length; i++)
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{
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excludes.add(url[i]);
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}
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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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{
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HttpServletRequest req = (HttpServletRequest) request;
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HttpServletResponse resp = (HttpServletResponse) response;
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if (handleExcludeURL(req, resp))
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{
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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);
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chain.doFilter(xssRequest, response);
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}
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private boolean handleExcludeURL(HttpServletRequest request, HttpServletResponse response)
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{
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String url = request.getServletPath();
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String method = request.getMethod();
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// GET DELETE 不过滤
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if (method == null || HttpMethod.GET.matches(method) || HttpMethod.DELETE.matches(method))
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{
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return true;
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}
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return StringUtils.matches(url, excludes);
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}
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@Override
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public void destroy()
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{
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}
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}
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