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 * DO NOT REMOVE OR ALTER!

 */

/**

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements. See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership. The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License. You may obtain a copy of the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing,

 * software distributed under the License is distributed on an

 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

 * KIND, either express or implied. See the License for the

 * specific language governing permissions and limitations

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 */

package com.sun.org.apache.xml.internal.security.keys.keyresolver.implementations;

import java.security.PrivateKey;

import java.security.PublicKey;

import java.security.cert.X509Certificate;

import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;

import com.sun.org.apache.xml.internal.security.keys.content.x509.XMLX509Certificate;

import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverException;

import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi;

import com.sun.org.apache.xml.internal.security.keys.storage.StorageResolver;

import com.sun.org.apache.xml.internal.security.utils.Constants;

import com.sun.org.apache.xml.internal.security.utils.XMLUtils;

import org.w3c.dom.Element;

/**

 * Resolves Certificates which are directly contained inside a

 * {@code ds:X509Certificate} Element.

 *

 */

public class X509CertificateResolver extends KeyResolverSpi {

    private static final com.sun.org.slf4j.internal.Logger LOG =

        com.sun.org.slf4j.internal.LoggerFactory.getLogger(X509CertificateResolver.class);

    /** {@inheritDoc} */

    @Override

    protected boolean engineCanResolve(Element element, String baseURI, StorageResolver storage) {

        return Constants.SignatureSpecNS.equals(element.getNamespaceURI());

    }

    /** {@inheritDoc} */

    @Override

    protected PublicKey engineResolvePublicKey(

        Element element, String baseURI, StorageResolver storage, boolean secureValidation

    ) throws KeyResolverException {

        X509Certificate cert =

            this.engineResolveX509Certificate(element, baseURI, storage, secureValidation);

        if (cert != null) {

            return cert.getPublicKey();

        }

        return null;

    }

    /** {@inheritDoc} */

    @Override

    protected X509Certificate engineResolveX509Certificate(

        Element element, String baseURI, StorageResolver storage, boolean secureValidation

    ) throws KeyResolverException {

        try {

            Element[] els =

                XMLUtils.selectDsNodes(element.getFirstChild(), Constants._TAG_X509CERTIFICATE);

            if (els == null || els.length == 0) {

                Element el =

                    XMLUtils.selectDsNode(element.getFirstChild(), Constants._TAG_X509DATA, 0);

                if (el != null) {

                    return engineResolveX509Certificate(el, baseURI, storage, secureValidation);

                }

                return null;

            }

            // populate Object array

            for (int i = 0; i < els.length; i++) {

                XMLX509Certificate xmlCert = new XMLX509Certificate(els[i], baseURI);

                X509Certificate cert = xmlCert.getX509Certificate();

                if (cert != null) {

                    return cert;

                }

            }

            return null;

        } catch (XMLSecurityException ex) {

            LOG.debug("Security Exception", ex);

            throw new KeyResolverException(ex);

        }

    }

    /** {@inheritDoc} */

    @Override

    protected javax.crypto.SecretKey engineResolveSecretKey(

        Element element, String baseURI, StorageResolver storage, boolean secureValidation

    ) {

        return null;

    }

    /** {@inheritDoc} */

    @Override

    protected PrivateKey engineResolvePrivateKey(

        Element element, String baseURI, StorageResolver storage, boolean secureValidation

    ) {

        return null;

    }

}