org.freeeed.search.web.interceptors.SessionInterceptor.java Source code

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Here is the source code for org.freeeed.search.web.interceptors.SessionInterceptor.java

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/*
 *
 * Copyright SHMsoft, Inc. 
 *
 * 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 org.freeeed.search.web.interceptors;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;
import org.freeeed.search.web.WebConstants;
import org.freeeed.search.web.controller.SecureController;
import org.freeeed.search.web.session.LoggedSiteVisitor;
import org.freeeed.search.web.session.LoggedSiteVisitorAware;
import org.freeeed.search.web.session.SiteVisitor;
import org.freeeed.search.web.session.SiteVisitorAware;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

/**
 * 
 * The Application Session Interceptor
 * 
 * @author ilazarov
 *
 */
public class SessionInterceptor extends HandlerInterceptorAdapter {
    private static final Logger log = Logger.getLogger(SessionInterceptor.class);

    private boolean isFreePage(Object handle) {
        return !(handle instanceof SecureController);
    }

    public boolean preHandle(HttpServletRequest req, HttpServletResponse res, Object handle) throws Exception {
        HttpSession session = req.getSession();
        SiteVisitor siteVisitor = null;
        LoggedSiteVisitor loggedSiteVisitor = (LoggedSiteVisitor) session
                .getAttribute(WebConstants.LOGGED_SITE_VISITOR_SESSION_KEY);

        if (!isFreePage(handle)) {
            log.debug("The page is NOT free for not logged users!");
            if (loggedSiteVisitor == null) {
                log.debug("The user is not logged in, will redirect the login required page!");

                redirectToLoginRequired(res);
                return false;
            }
        }

        log.debug("The page is free for not logged users!");

        if (handle instanceof SiteVisitorAware) {
            siteVisitor = (SiteVisitor) session.getAttribute(WebConstants.SITE_VISITOR_SESSION_KEY);
            if (siteVisitor == null) {
                siteVisitor = new SiteVisitor();
                siteVisitor.setVisitorIP(req.getRemoteHost());

                session.setAttribute(WebConstants.SITE_VISITOR_SESSION_KEY, siteVisitor);
            }

            ((SiteVisitorAware) handle).setSiteVisitor(siteVisitor);
        }

        if (handle instanceof LoggedSiteVisitorAware) {
            ((LoggedSiteVisitorAware) handle).setLoggedVisitor(loggedSiteVisitor);
        }

        return true;
    }

    private void redirectToLoginRequired(HttpServletResponse res) throws IOException {
        String url = res.encodeRedirectURL(WebConstants.LOGIN_REQUIRED_PAGE);
        res.sendRedirect(url);
    }
}