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 * reserved comment block

 * 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 javax.crypto.SecretKey;

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 a single Key based on the KeyName.

 */

public class SingleKeyResolver extends KeyResolverSpi {

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

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

    private String keyName;

    private PublicKey publicKey;

    private PrivateKey privateKey;

    private SecretKey secretKey;

    /**

     * Constructor.

     * @param keyName

     * @param publicKey

     */

    public SingleKeyResolver(String keyName, PublicKey publicKey) {

        this.keyName = keyName;

        this.publicKey = publicKey;

    }

    /**

     * Constructor.

     * @param keyName

     * @param privateKey

     */

    public SingleKeyResolver(String keyName, PrivateKey privateKey) {

        this.keyName = keyName;

        this.privateKey = privateKey;

    }

    /**

     * Constructor.

     * @param keyName

     * @param secretKey

     */

    public SingleKeyResolver(String keyName, SecretKey secretKey) {

        this.keyName = keyName;

        this.secretKey = secretKey;

    }

    /**

     * This method returns whether the KeyResolverSpi is able to perform the requested action.

     *

     * @param element

     * @param baseURI

     * @param storage

     * @return whether the KeyResolverSpi is able to perform the requested action.

     */

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

        return XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_KEYNAME);

    }

    /**

     * Method engineLookupAndResolvePublicKey

     *

     * @param element

     * @param baseURI

     * @param storage

     * @return null if no {@link PublicKey} could be obtained

     * @throws KeyResolverException

     */

    public PublicKey engineLookupAndResolvePublicKey(

        Element element, String baseURI, StorageResolver storage

    ) throws KeyResolverException {

        LOG.debug("Can I resolve {}?", element.getTagName());

        if (publicKey != null

            && XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_KEYNAME)) {

            String name = element.getFirstChild().getNodeValue();

            if (keyName.equals(name)) {

                return publicKey;

            }

        }

        LOG.debug("I can't");

        return null;

    }

    /**

     * Method engineResolveX509Certificate

     * {@inheritDoc}

     * @param element

     * @param baseURI

     * @param storage

     * @throws KeyResolverException

     */

    public X509Certificate engineLookupResolveX509Certificate(

        Element element, String baseURI, StorageResolver storage

    ) throws KeyResolverException {

        return null;

    }

    /**

     * Method engineResolveSecretKey

     *

     * @param element

     * @param baseURI

     * @param storage

     * @return resolved SecretKey key or null if no {@link SecretKey} could be obtained

     *

     * @throws KeyResolverException

     */

    public SecretKey engineResolveSecretKey(

        Element element, String baseURI, StorageResolver storage

    ) throws KeyResolverException {

        LOG.debug("Can I resolve {}?", element.getTagName());

        if (secretKey != null

            && XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_KEYNAME)) {

            String name = element.getFirstChild().getNodeValue();

            if (keyName.equals(name)) {

                return secretKey;

            }

        }

        LOG.debug("I can't");

        return null;

    }

    /**

     * Method engineResolvePrivateKey

     * {@inheritDoc}

     * @param element

     * @param baseURI

     * @param storage

     * @return resolved PrivateKey key or null if no {@link PrivateKey} could be obtained

     * @throws KeyResolverException

     */

    public PrivateKey engineLookupAndResolvePrivateKey(

        Element element, String baseURI, StorageResolver storage

    ) throws KeyResolverException {

        LOG.debug("Can I resolve {}?", element.getTagName());

        if (privateKey != null

            && XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_KEYNAME)) {

            String name = element.getFirstChild().getNodeValue();

            if (keyName.equals(name)) {

                return privateKey;

            }

        }

        LOG.debug("I can't");

        return null;

    }

}