/* 
 * Copyright (c) 2001, Xiaoping Jia.  
 * All Rights Reserved. 
 */

package expo2; 

import java.io.*; 
import java.util.*; 
import javax.servlet.*; 
import javax.servlet.http.*; 
import org.apache.ecs.*;
import org.apache.ecs.html.*;

/** 
 *  Java Expo web app version 2.
 *  The Java Expo web app logout servlet.
 *  
 * @version 1.1 2001/04/20 
 * @since 1.0
 * @author Xiaoping Jia
 */ 
public class JavaExpoLogout extends JavaExpoBase { 

  public boolean handleRequest(HttpServletRequest request, 
			       HttpServletResponse response, 
			       List contents) 
    throws ServletException, IOException { 
    Cookie[] cookies = request.getCookies(); 
    Cookie loginCookie = null;
    if (cookies != null) { 
      for (int i = 0; i < cookies.length; i++) { 
	if ("direct-login".equals(cookies[i].getName())) { 
	  loginCookie = cookies[i]; 
	}
      }
    }
    
    String submit = request.getParameter("submit"); 
    if (submit == null) { 
      // invoked from the menu 
      if (loginCookie != null) { 
	// logged in 
	contents.add(new Form(response.encodeURL(urlPrefix + "JavaExpoLogout"), "post")
	  .addElement(new Input(Input.submit, "submit", "Logout"))
	  .addElement(new Input(Input.submit, "submit", "Disable direct login & logout")));
      } else { 
	// not logged in 
	contents.add(new H1("Bye."));
      }
    } else {
      // invoked by submitting the form 
      if ("Disable direct login & logout".equals(submit)) { 
	if (loginCookie != null) { 
	  // remove login cookie 
	  loginCookie.setMaxAge(0); 
	}
	response.addCookie(loginCookie);
      }
      contents.add(new H1("Bye."));
    }
    return true; 
  }

}