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//
//  ========================================================================
//  Copyright (c) 1995-2018 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.util.ssl;

import java.net.Socket;
import java.security.Principal;
import java.security.PrivateKey;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLEngine;
import javax.net.ssl.X509ExtendedKeyManager;

/**
 * An {@link X509ExtendedKeyManager} that select a key with desired alias,
 * delegating other processing to a nested X509ExtendedKeyManager.
 * Can be used both with server and client sockets.
 */
public class AliasedX509ExtendedKeyManager extends X509ExtendedKeyManager
{
    private final String _alias;
    private final X509ExtendedKeyManager _delegate;

    public AliasedX509ExtendedKeyManager(X509ExtendedKeyManager keyManager, String keyAlias)
    {
        _alias = keyAlias;
        _delegate = keyManager;
    }

    public X509ExtendedKeyManager getDelegate()
    {
        return _delegate;
    }

    @Override
    public String chooseClientAlias(String[] keyType, Principal[] issuers, Socket socket)
    {
        if (_alias==null)
            return _delegate.chooseClientAlias(keyType,issuers,socket);

        for (String kt : keyType)
        {
            String[] aliases = _delegate.getClientAliases(kt,issuers);
            if (aliases!=null)
            {
                for (String a:aliases)
                    if (_alias.equals(a))
                        return _alias;
            }
        }

        return null;
    }

    @Override
    public String chooseServerAlias(String keyType, Principal[] issuers, Socket socket)
    {
        if (_alias==null)
            return _delegate.chooseServerAlias(keyType,issuers,socket);

        String[] aliases = _delegate.getServerAliases(keyType,issuers);
        if (aliases!=null)
        {
            for (String a:aliases)
                if (_alias.equals(a))
                    return _alias;
        }

        return null;
    }

    @Override
    public String[] getClientAliases(String keyType, Principal[] issuers)
    {
        return _delegate.getClientAliases(keyType, issuers);
    }

    @Override
    public String[] getServerAliases(String keyType, Principal[] issuers)
    {
        return _delegate.getServerAliases(keyType, issuers);
    }

    @Override
    public X509Certificate[] getCertificateChain(String alias)
    {
        return _delegate.getCertificateChain(alias);
    }

    @Override
    public PrivateKey getPrivateKey(String alias)
    {
        return _delegate.getPrivateKey(alias);
    }

    @Override
    public String chooseEngineServerAlias(String keyType, Principal[] issuers, SSLEngine engine)
    {
        if (_alias==null)
            return _delegate.chooseEngineServerAlias(keyType,issuers,engine);

        String[] aliases = _delegate.getServerAliases(keyType,issuers);
        if (aliases!=null)
        {
            for (String a:aliases)
                if (_alias.equals(a))
                    return _alias;
        }

        return null;
    }

    @Override
    public String chooseEngineClientAlias(String keyType[], Principal[] issuers, SSLEngine engine)
    {
        if (_alias==null)
            return _delegate.chooseEngineClientAlias(keyType,issuers,engine);

        for (String kt : keyType)
        {
            String[] aliases = _delegate.getClientAliases(kt,issuers);
            if (aliases!=null)
            {
                for (String a:aliases)
                    if (_alias.equals(a))
                        return _alias;
            }
        }

        return null;
    }
}