cn.vlabs.duckling.vwb.CPSFilter.java Source code

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Here is the source code for cn.vlabs.duckling.vwb.CPSFilter.java

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/*
 * Copyright (c) 2008-2016 Computer Network Information Center (CNIC), Chinese Academy of Sciences.
 * 
 * This file is part of Duckling project.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 *
 */

package cn.vlabs.duckling.vwb;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;

/**
 * @date 2015414
 * @author xzj
 */
public class CPSFilter implements Filter {

    private static String CPS_ADV = "cps_adv";

    @Override
    public void destroy() {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        int advSiteId = Integer.parseInt(StringUtils.defaultIfEmpty(request.getParameter("as"), "-1"));

        if (advSiteId <= 0) {
            chain.doFilter(request, response);
            return;
        }

        HttpServletResponse rep = (HttpServletResponse) response;
        HttpServletRequest req = (HttpServletRequest) request;
        request.setAttribute("cps", advSiteId);

        Cookie[] cookies = req.getCookies();

        if (cookies != null) {
            for (Cookie cookie : cookies) {
                if (StringUtils.equals(CPS_ADV, cookie.getName())) {
                    cookie.setPath(req.getContextPath());
                    cookie.setMaxAge(0);
                }
            }
        }

        Cookie myCookie = new Cookie(CPS_ADV, advSiteId + "");
        myCookie.setMaxAge(60 * 60 * 24);//
        myCookie.setPath(req.getContextPath());
        rep.addCookie(myCookie);
        chain.doFilter(request, response);
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {

    }

}