csns.web.filter.DepartmentFilter.java Source code

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Here is the source code for csns.web.filter.DepartmentFilter.java

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/*
 * This file is part of the CSNetwork Services (CSNS) project.
 * 
 * Copyright 2012, Chengyu Sun (csun@calstatela.edu).
 * 
 * CSNS is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 * 
 * CSNS is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
 * more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with CSNS. If not, see http://www.gnu.org/licenses/agpl.html.
 */
package csns.web.filter;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;
import org.springframework.web.util.WebUtils;

@Component
public class DepartmentFilter extends OncePerRequestFilter {

    private static final Logger logger = LoggerFactory.getLogger(DepartmentFilter.class);

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
            FilterChain filterChain) throws ServletException, IOException {
        String contextPath = request.getContextPath();
        String path = request.getRequestURI().substring(contextPath.length());
        Cookie cookie = WebUtils.getCookie(request, "default-dept");

        if (path.startsWith("/department/")) {
            int beginIndex = "/department/".length();
            int endIndex = path.indexOf("/", beginIndex);
            if (endIndex < 0)
                endIndex = path.length();
            String dept = path.substring(beginIndex, endIndex);
            request.setAttribute("dept", dept);

            logger.debug(path + " -> " + dept);

            if (cookie == null) {
                cookie = new Cookie("default-dept", dept);
                cookie.setPath("/");
                cookie.setMaxAge(100000000);
                response.addCookie(cookie);
            }
        } else {
            if (cookie != null)
                request.setAttribute("dept", cookie.getValue());
        }

        filterChain.doFilter(request, response);
    }

}