package com.ibm.test.wcm.app.atom.servlet;

import java.io.IOException;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionServlet;

public class AuthServlet extends ActionServlet
{

    public AuthServlet()
    {
    }

    protected void process(HttpServletRequest p_request, HttpServletResponse p_response)
        throws IOException, ServletException
    {
        try
        {
            if(authenticateSession(p_request))
            {
                if(!p_request.getServletPath().endsWith(PROTECTED_SERVLET_PATH))
                    redirectToMyAtom(p_request, p_response);
                super.process(p_request, p_response);
            } else
            {
                super.process(p_request, p_response);
            }
        }
        catch (Exception e) 
        {
        	throw new ServletException("Exception in AuthServlet", e);
        }
        
    
        
    }

    private boolean authenticateSession(HttpServletRequest p_request)
    {
    	return (p_request.getUserPrincipal() != null || !p_request.getUserPrincipal().equals(null)) ;
    }

    private void redirectToMyAtom(HttpServletRequest p_request, HttpServletResponse p_response)
        throws IOException
    {
        String url = p_request.getRequestURL().toString();
        url = url.replaceFirst(PUBLIC_SERVLET_PATH, PROTECTED_SERVLET_PATH);
        if(p_request.getParameterMap().size() != 0)
        {
            StringBuffer sb = new StringBuffer(url);
            Enumeration en = p_request.getParameterNames();
            char separator = '?';
            while(en.hasMoreElements()) 
            {
                String parmName = (String)en.nextElement();
                String parmValues[] = p_request.getParameterValues(parmName);
                for(int i = 0; i < parmValues.length; i++)
                {
                    sb.append(separator);
                    separator = '&';
                    sb.append(parmName);
                    sb.append('=');
                    sb.append(parmValues[i]);
                }

            }
            url = sb.toString();
        }
        p_response.sendRedirect(url);
    }

    public static final String PROTECTED_SERVLET_PATH = "/myatom";
    public static final String PUBLIC_SERVLET_PATH = "/atom";

   
}