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 * DO NOT REMOVE OR ALTER!

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/**

 * 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

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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.Certificate;

import java.security.cert.X509Certificate;

import java.util.Iterator;

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

import com.sun.org.apache.xml.internal.security.keys.content.x509.XMLX509SKI;

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;

public class X509SKIResolver extends KeyResolverSpi {

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

        com.sun.org.slf4j.internal.LoggerFactory.getLogger(X509SKIResolver.class);

    /** {@inheritDoc} */

    @Override

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

        if (!XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_X509DATA)) {

            return false;

        }

        Element[] x509childNodes =

            XMLUtils.selectDsNodes(element.getFirstChild(), Constants._TAG_X509SKI);

        return x509childNodes != null && x509childNodes.length > 0;

    }

    /** {@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 {

        Element[] x509childNodes =

            XMLUtils.selectDsNodes(element.getFirstChild(), Constants._TAG_X509SKI);

        if (!(x509childNodes != null && x509childNodes.length > 0)) {

            return null;

        }

        try {

            if (storage == null) {

                Object[] exArgs = { Constants._TAG_X509SKI };

                KeyResolverException ex =

                    new KeyResolverException("KeyResolver.needStorageResolver", exArgs);

                LOG.debug("", ex);

                throw ex;

            }

            XMLX509SKI[] x509childObject = new XMLX509SKI[x509childNodes.length];

            for (int i = 0; i < x509childNodes.length; i++) {

                x509childObject[i] = new XMLX509SKI(x509childNodes[i], baseURI);

            }

            Iterator<Certificate> storageIterator = storage.getIterator();

            while (storageIterator.hasNext()) {

                X509Certificate cert = (X509Certificate)storageIterator.next();

                XMLX509SKI certSKI = new XMLX509SKI(element.getOwnerDocument(), cert);

                for (int i = 0; i < x509childObject.length; i++) {

                    if (certSKI.equals(x509childObject[i])) {

                        LOG.debug("Return PublicKey from {}", cert.getSubjectX500Principal().getName());

                        return cert;

                    }

                }

            }

        } catch (XMLSecurityException ex) {

            throw new KeyResolverException(ex);

        }

        return null;

    }

    /** {@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;

    }

}