/*
 * #%L
 * Alfresco Remote API
 * %%
 * Copyright (C) 2005 - 2019 Alfresco Software Limited
 * %%
 * This file is part of the Alfresco software. 
 * If the software was purchased under a paid Alfresco license, the terms of 
 * the paid license agreement will prevail.  Otherwise, the software is 
 * provided under the following open source license terms:
 * 
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Alfresco is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */
package org.alfresco.web.app.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.alfresco.repo.web.auth.WebCredentials;
import org.alfresco.repo.webdav.auth.AuthenticationDriver;
import org.alfresco.repo.webdav.auth.BaseKerberosAuthenticationFilter;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Kerberos Authentication Filter Class
 * 
 * @author GKSpencer
 */
public class KerberosAuthenticationFilter extends BaseKerberosAuthenticationFilter
{
    // Debug logging
    
    private static Log logger = LogFactory.getLog(KerberosAuthenticationFilter.class);
  
    
    /* (non-Javadoc)
     * @see org.alfresco.repo.webdav.auth.BaseKerberosAuthenticationFilter#init()
     */
    @Override
    protected void init() throws ServletException
    {
        // Call the base Kerberos filter initialization
        super.init();

        // Use the web client user attribute name
        setUserAttributeName(AuthenticationDriver.AUTHENTICATION_USER);
    }
    
    /* (non-Javadoc)
     * @see org.alfresco.repo.webdav.auth.BaseSSOAuthenticationFilter#onValidateFailed(javax.servlet.Ser