/*
 * Copyright 2011 by Graz University of Technology, Austria
 * MOCCA has been developed by the E-Government Innovation Center EGIZ, a joint
 * initiative of the Federal Chancellery Austria 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.egiz.bku.local.webapp;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Collections;
import java.util.List;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import at.gv.egiz.bku.local.stal.LocalIdentityLinkSTALFactory;
import at.gv.egiz.stal.QuitRequest;
import at.gv.egiz.stal.STAL;
import at.gv.egiz.stal.STALResponse;
import at.gv.egiz.stal.ext.IdentityLinkRequest;

/**
 * IdentityLink BKU Worker for non-applet version
 * 
 * @author Andreas Fitzek <andreas.fitzek@iaik.tugraz.at>
 */
public class IdentityLinkServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	private final Logger log = LoggerFactory
			.getLogger(IdentityLinkServlet.class);

	LocalIdentityLinkSTALFactory stalFactory;

	public IdentityLinkServlet() {
		stalFactory = new LocalIdentityLinkSTALFactory();
		try {
			stalFactory.setHelpURL("http://localhost:3495/help/");
		} catch (MalformedURLException e) {
			log.info("Failed to set help URL.", e);
		}
	}

	/**
	 * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
	 * methods.
	 * 
	 * @param request
	 *            servlet request
	 * @param response
	 *            servlet response
	 * @throws ServletException
	 *             if a servlet-specific error occurs
	 * @throws IOException
	 *             if an I/O error occurs
	 */
	protected void processRequest(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		log.info("processRequest: IdentityLinkServlet");
		STAL pinMgmtSTAL = stalFactory.createSTAL();
	    List<STALResponse> stalResps = pinMgmtSTAL.handleRequest(Collections.singletonList(new IdentityLinkRequest()));
	    log.debug("Received STAL reponse {}.", stalResps.get(0).getClass());
	    pinMgmtSTAL.handleRequest(Collections.singletonList(new QuitRequest()));

	    String redirect = request.getParameter("redirect");
	    if (redirect != null) {
	      String referer = request.getHeader("Referer");
	      if (referer != null) {
	        redirect = new URL(new URL(referer), redirect).toExternalForm();
	      }
	      response.sendRedirect(redirect);
	    } else {
	      response.setStatus(HttpServletResponse.SC_OK);
	    }
	}

	/**
	 * Handles the HTTP <code>GET</code> method.
	 * 
	 * @param request
	 *            servlet request
	 * @param response
	 *            servlet response
	 * @throws ServletException
	 *             if a servlet-specific error occurs
	 * @throws IOException
	 *             if an I/O error occurs
	 */
	@Override
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		processRequest(request, response);
	}

	/**
	 * Handles the HTTP <code>POST</code> method.
	 * 
	 * @param request
	 *            servlet request
	 * @param response
	 *            servlet response
	 * @throws ServletException
	 *             if a servlet-specific error occurs
	 * @throws IOException
	 *             if an I/O error occurs
	 */
	@Override
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		processRequest(request, response);
	}
}