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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
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.ws.security.message.token;

import org.apache.ws.security.WSConstants;
import org.apache.ws.security.WSSecurityException;
import org.apache.ws.security.util.DOM2Writer;
import org.apache.ws.security.util.WSSecurityUtil;
import org.apache.ws.security.util.Base64;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;


/**
 * Signature Confirmation element.
 *
 *
 * @author Werner Dittmann ([email protected])
 */
public class SignatureConfirmation {

    private static final String VALUE = "Value"; 
    protected Element element = null;
    private byte[] signatureValue = null;
    
    /**
     * Constructs a SignatureConfirmation object and parses the
     * wsse11:SignatureCOnfirmation element to initialize it.
     *
     * @param elem the wsse11:SignatureCOnfirmation element that
     *             contains the confirmation data
     */
    public SignatureConfirmation(Element elem) throws WSSecurityException {
        element = elem;
        String sv = element.getAttributeNS(null, VALUE);
        if (sv != null) {
            signatureValue = Base64.decode(sv);
        }
    }

    /**
     * Constructs a SignatureConfirmation object according
     * to the defined parameters.
     *
     * @param doc the SOAP envelope as Document
     * @param signVal the Signature value as byte[] of null 
     *   if no value available.
     */
    public SignatureConfirmation(Document doc, byte[] signVal) {
        element = 
            doc.createElementNS(
                WSConstants.WSSE11_NS, 
                WSConstants.WSSE11_PREFIX + ":"  + WSConstants.SIGNATURE_CONFIRMATION_LN
            );
        WSSecurityUtil.setNamespace(element, WSConstants.WSSE11_NS, WSConstants.WSSE11_PREFIX);
        if (signVal != null) {
            String sv = Base64.encode(signVal);
            element.setAttributeNS(null, VALUE, sv);
        }

    }

    /**
     * Returns the dom element of this Timestamp object.
     *
     * @return the wsse:UsernameToken element
     */
    public Element getElement() {
        return this.element;
    }

    /**
     * Returns the string representation of the token.
     *
     * @return a XML string representation
     */
    public String toString() {
        return DOM2Writer.nodeToString((Node) this.element);
    }
    
    /**
     * Set wsu:Id attribute of this SignatureConfirmation element.
     * @param id
     */
    public void setID(String id) {
        String prefix = 
            WSSecurityUtil.setNamespace(this.element, WSConstants.WSU_NS, WSConstants.WSU_PREFIX);
        this.element.setAttributeNS(WSConstants.WSU_NS, prefix + ":Id", id);
    }
    
    /**
     * Returns the value of the wsu:Id attribute
     * @return TODO
     */
    public String getID() {
        return this.element.getAttributeNS(WSConstants.WSU_NS, "Id");
    }

    /**
     * @return Returns the signatureValue.
     */
    public byte[] getSignatureValue() {
        return signatureValue;
    }
    
}