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//
//  ========================================================================
//  Copyright (c) 1995-2016 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 java.io.IOException;

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

import org.eclipse.jetty.http.HttpHeaders;
import org.eclipse.jetty.security.ServerAuthException;
import org.eclipse.jetty.security.UserAuthentication;
import org.eclipse.jetty.server.Authentication;
import org.eclipse.jetty.server.Authentication.User;
import org.eclipse.jetty.server.UserIdentity;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.security.Constraint;

public class SpnegoAuthenticator extends LoginAuthenticator
{
    private static final Logger LOG = Log.getLogger(SpnegoAuthenticator.class);
    
    private String _authMethod = Constraint.__SPNEGO_AUTH;
    
    public SpnegoAuthenticator()
    {
    	
    }
    
    /**
     * Allow for a custom authMethod value to be set for instances where SPENGO may not be appropriate
     * @param authMethod
     */
    public SpnegoAuthenticator( String authMethod )
    {
    	_authMethod = authMethod;
    }
    
    public String getAuthMethod()
    {
        return _authMethod;
    }



    public Authentication validateRequest(ServletRequest request, ServletResponse response, boolean mandatory) throws ServerAuthException
    {        
        HttpServletRequest req = (HttpServletRequest)request;
        HttpServletResponse res = (HttpServletResponse)response;
        
        String header = req.getHeader(HttpHeaders.AUTHORIZATION);

        if (!mandatory)
        {
            return new DeferredAuthentication(this);
        }
        
        // check to see if we have authorization headers required to continue
        if ( header == null )
        {
            try
            {
            	 if (DeferredAuthentication.isDeferred(res))
            	 {
                     return Authentication.UNAUTHENTICATED;
            	 }
            	 
                LOG.debug("SpengoAuthenticator: sending challenge");
                res.setHeader(HttpHeaders.WWW_AUTHENTICATE, HttpHeaders.NEGOTIATE);
                res.sendError(HttpServletResponse.SC_UNAUTHORIZED);
                return Authentication.SEND_CONTINUE;
            } 
            catch (IOException ioe)
            {
                throw new ServerAuthException(ioe);
            }       
        }
        else if (header != null && header.startsWith(HttpHeaders.NEGOTIATE))
        {
            String spnegoToken = header.substring(10);
            
            UserIdentity user = login(null,spnegoToken, request);
            
            if ( user != null )
            {
                return new UserAuthentication(getAuthMethod(),user);
            }
        }
        
        return Authentication.UNAUTHENTICATED;
    }

    public boolean secureResponse(ServletRequest request, ServletResponse response, boolean mandatory, User validatedUser) throws ServerAuthException
    {
        return true;
    }

}