Session Expiration Filter
/*
************************************************************************************
* Copyright (C) 2008-2009 Openbravo S.L.
* Licensed under the Apache Software License version 2.0
* 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.
************************************************************************************
*/
import java.io.IOException;
import java.util.Date;
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.HttpServletRequest;
import javax.servlet.http.HttpSession;
public class SessionExpirationFilter implements Filter {
public void init(FilterConfig config) {
}
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest hReq = (HttpServletRequest) req;
HttpSession session = hReq.getSession(false);
if (null != session) {
Date expirationDate = (Date) session.getAttribute("expirationDate");
if (expirationDate == null)
expirationDate = new Date(System.currentTimeMillis() + 1000000); // only
// for
// make
// false
// "expirationDate.before(new Date())"
// in
// the
// first
// execution
if (expirationDate.before(new Date())) {
session.invalidate();
session = null;
} else {
// ignore requests marked as both ajaxCall and ignoreForSessionTimeout
String isAjaxCall = hReq.getParameter("IsAjaxCall");
String ignoreForSessionTimeout = hReq.getParameter("ignoreForSessionTimeout");
boolean ignoreForTimeout = "1".equals(isAjaxCall) && ("1".equals(ignoreForSessionTimeout));
if (ignoreForTimeout) {
// Do nothing; don't update the session timestamp
} else {
session.setAttribute("expirationDate", new Date(System.currentTimeMillis()
+ session.getMaxInactiveInterval() * 1000));
}
}
}
chain.doFilter(req, resp);
}
public void destroy() {
}
}
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