//
//  ========================================================================
//  Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.security.authentication;

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

import org.eclipse.jetty.security.Authenticator;
import org.eclipse.jetty.security.IdentityService;
import org.eclipse.jetty.security.LoginService;
import org.eclipse.jetty.server.Authentication;
import org.eclipse.jetty.server.UserIdentity;
import org.eclipse.jetty.server.session.AbstractSessionManager;

public abstract class LoginAuthenticator implements Authenticator
{
    protected LoginService _loginService;
    protected IdentityService _identityService;
    private boolean _renewSession;

    protected LoginAuthenticator()
    {
    }


    /* ------------------------------------------------------------ */
    public UserIdentity login(String username, Object password, ServletRequest request)
    {
        UserIdentity user = _loginService.login(username,password);
        if (user!=null)
        {
            renewSession((HttpServletRequest)request, null);
            return user;
        }
        return null;
    }


    public void setConfiguration(AuthConfiguration configuration)
    {
        _loginService=configuration.getLoginService();
        if (_loginService==null)
            throw new IllegalStateException("No LoginService for "+this+" in "+configuration);
        _identityService=configuration.getIdentityService();
        if (_identityService==null)
            throw new IllegalStateException("No IdentityService for "+this+" in "+configuration);
        _renewSession=configuration.isSessionRenewedOnAuthentication();
    }
    
    public LoginService getLoginService()
    {
        return _loginService;
    }
    
    /** Change the session id.
     * The session is changed to a new instance with a new ID if and only if:<ul>
     * <li>A session exists.
     * <li>The {@link AuthConfiguration#isSessionRenewedOnAuthentication()} returns true.
     * <li>The session ID has been given to unauthenticated responses
     * </ul>
     * @param request
     * @param response
     * @return The new session.
     */
    protected HttpSession renewSession(HttpServletRequest request, HttpServletResponse response)
    {
        HttpSession httpSession = request.getSession(false);
       
        //if we should renew sessions, and there is an existing session that may have been seen by non-authenticated users
        //(indicated by SESSION_SECURED not being set on the session) then we should change id
        if (_renewSession && httpSession!=null && httpSession.getAttribute(AbstractSessionManager.SESSION_KNOWN_ONLY_TO_AUTHENTICATED)!=Boolean.TRUE)
        {
            synchronized (this)
            {
                httpSession = AbstractSessionManager.renewSession(request, httpSession,true);
            }
        }
        return httpSession;
    }
}