/**
    * 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.wss4j.dom.message.token;
  
  import java.util.Arrays;
  
  import org.apache.wss4j.dom.WSConstants;
  import org.apache.wss4j.common.bsp.BSPEnforcer;
  import org.apache.wss4j.common.bsp.BSPRule;
  import org.apache.wss4j.common.ext.WSSecurityException;
  import org.apache.wss4j.common.util.DOM2Writer;
  import org.apache.wss4j.common.util.XMLUtils;
  import org.w3c.dom.Document;
  import org.w3c.dom.Element;
  
  
  /**
   * Signature Confirmation element.
   */
  public class SignatureConfirmation {
  
      public static final String SC_VALUE_ATTR = "Value";
      private Element element;
      private byte[] signatureValue;
  
      /**
       * Constructs a <code>SignatureConfirmation</code> object and parses the
       * <code>wsse11:SignatureConfirmation</code> element to initialize it.
       *
       * @param elem the <code>wsse11:SignatureCOnfirmation</code> element that
       *             contains the confirmation data
       * @param bspEnforcer a BSPEnforcer instance used to enforce BSP rules
       */
      public SignatureConfirmation(Element elem, BSPEnforcer bspEnforcer) throws WSSecurityException {
          element = elem;
  
          String id = getID();
          if (id == null || id.length() == 0) {
              bspEnforcer.handleBSPRule(BSPRule.R5441);
          }
  
          String sv = element.getAttributeNS(null, SC_VALUE_ATTR);
          if (sv != null) {
              signatureValue = org.apache.xml.security.utils.XMLUtils.decode(sv);
          }
      }
  
      /**
       * Constructs a <code>SignatureConfirmation</code> object according
       * to the defined parameters.
       *
       * @param doc the SOAP envelope as <code>Document</code>
       * @param signVal the Signature value as byte[] of <code>null</code>
       * if no value available.
       */
      public SignatureConfirmation(Document doc, byte[] signVal) {
          element =
              doc.createElementNS(
                  WSConstants.WSSE11_NS,
                  WSConstants.WSSE11_PREFIX + ":"  + WSConstants.SIGNATURE_CONFIRMATION_LN
              );
          XMLUtils.setNamespace(element, WSConstants.WSSE11_NS, WSConstants.WSSE11_PREFIX);
          if (signVal != null) {
              String sv = org.apache.xml.security.utils.XMLUtils.encodeToString(signVal);
              element.setAttributeNS(null, SC_VALUE_ATTR, sv);
          }
      }
  
      /**
       * Add the WSU Namespace to this SC. The namespace is not added by default for
       * efficiency purposes.
       */
      public void addWSUNamespace() {
          element.setAttributeNS(XMLUtils.XMLNS_NS, "xmlns:" + WSConstants.WSU_PREFIX, WSConstants.WSU_NS);
      }
  
      /**
       * Returns the dom element of this <code>SignatureConfirmation</code> object.
       *
       * @return the <code>wsse11:SignatureConfirmation</code> element
       */
      public Element getElement() {
         return element;
     }
 
     /**
      * Returns the string representation of the token.
      *
      * @return a XML string representation
      */
     public String toString() {
         return DOM2Writer.nodeToString(element);
     }
 
     /**
      * Set wsu:Id attribute of this SignatureConfirmation element.
      * @param id
      */
     public void setID(String id) {
         element.setAttributeNS(WSConstants.WSU_NS, WSConstants.WSU_PREFIX + ":Id", id);
     }
 
     /**
      * Returns the value of the wsu:Id attribute
      * @return the WSU ID
      */
     public String getID() {
         return element.getAttributeNS(WSConstants.WSU_NS, "Id");
     }
 
     /**
      * @return Returns the signatureValue.
      */
     public byte[] getSignatureValue() {
         return signatureValue;
     }
 
     @Override
     public int hashCode() {
         int result = 17;
         if (signatureValue != null) {
             result = 31 * result + Arrays.hashCode(signatureValue);
         }
         return result;
     }
 
     @Override
     public boolean equals(Object object) {
         if (!(object instanceof SignatureConfirmation)) {
             return false;
         }
         SignatureConfirmation signatureConfirmation = (SignatureConfirmation)object;
         byte[] sigValue = signatureConfirmation.getSignatureValue();
         return Arrays.equals(sigValue, getSignatureValue());
     }
 
 }