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// ========================================================================
// Copyright (c) 2008-2009 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 java.security.Principal;
import java.security.cert.X509Certificate;

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

import org.eclipse.jetty.http.security.Constraint;
import org.eclipse.jetty.security.ServerAuthException;
import org.eclipse.jetty.security.UserAuthentication;
import org.eclipse.jetty.server.Authentication;
import org.eclipse.jetty.server.UserIdentity;
import org.eclipse.jetty.server.Authentication.User;
import org.eclipse.jetty.util.B64Code;

/**
 * @version $Rev: 4793 $ $Date: 2009-03-19 00:00:01 +0100 (Thu, 19 Mar 2009) $
 */
public class ClientCertAuthenticator extends LoginAuthenticator
{
    public ClientCertAuthenticator()
    {
        super();
    }

    public String getAuthMethod()
    {
        return Constraint.__CERT_AUTH;
    }
    
    /**
     * @return Authentication for request
     * @throws ServerAuthException
     */
    public Authentication validateRequest(ServletRequest req, ServletResponse res, boolean mandatory) throws ServerAuthException
    {
        if (!mandatory)
            return _deferred;
        
        HttpServletRequest request = (HttpServletRequest)req;
        HttpServletResponse response = (HttpServletResponse)res;
        X509Certificate[] certs = (X509Certificate[]) request.getAttribute("javax.servlet.request.X509Certificate");

        try
        {
            // Need certificates.
            if (certs != null && certs.length > 0)
            {
                for (X509Certificate cert: certs)
                {
                    if (cert==null)
                        continue;
                    Principal principal = cert.getSubjectDN();
                    if (principal == null) principal = cert.getIssuerDN();
                    final String username = principal == null ? "clientcert" : principal.getName();

                    final char[] credential = B64Code.encode(cert.getSignature());

                    UserIdentity user = _loginService.login(username,credential);
                    if (user!=null)
                    {
                        renewSessionOnAuthentication(request,response);
                        return new UserAuthentication(getAuthMethod(),user);
                    }
                }
            }
                
            if (!_deferred.isDeferred(response))
            {
                response.sendError(HttpServletResponse.SC_FORBIDDEN);
                return Authentication.SEND_FAILURE;
            }
            
            return Authentication.UNAUTHENTICATED;
        }
        catch (IOException e)
        {
            throw new ServerAuthException(e.getMessage());
        }
    }

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