/*
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */
package at.gv.egovernment.moa.id.auth.servlet.interceptor;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import at.gv.egovernment.moa.id.advancedlogging.TransactionIDUtils;
import at.gv.egovernment.moa.id.commons.MOAIDConstants;
import at.gv.egovernment.moa.id.moduls.SSOManager;
import at.gv.egovernment.moa.id.util.Random;
import at.gv.egovernment.moa.util.MiscUtil;

/**
 * @author tlenz
 *
 */
public class UniqueSessionIdentifierInterceptor implements HandlerInterceptor {

	@Autowired private SSOManager ssomanager;
	
	/* (non-Javadoc)
	 * @see org.springframework.web.servlet.HandlerInterceptor#preHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object)
	 */
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		
		//get SSO Cookie for Request
		String ssoId = ssomanager.getSSOSessionID(request);
		
		//search for unique session identifier
		String uniqueSessionIdentifier = ssomanager.getUniqueSessionIdentifier(ssoId);											
		if (MiscUtil.isEmpty(uniqueSessionIdentifier))
			uniqueSessionIdentifier = Random.nextRandom();
		
		TransactionIDUtils.setSessionId(uniqueSessionIdentifier);		
		request.setAttribute(MOAIDConstants.UNIQUESESSIONIDENTIFIER, uniqueSessionIdentifier);
		
		return true; 
	}

	/* (non-Javadoc)
	 * @see org.springframework.web.servlet.HandlerInterceptor#postHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, org.springframework.web.servlet.ModelAndView)
	 */
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		
	}

	/* (non-Javadoc)
	 * @see org.springframework.web.servlet.HandlerInterceptor#afterCompletion(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, java.lang.Exception)
	 */
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		TransactionIDUtils.removeAllLoggingVariables();
		
	}

}