org.apache.jcp.xml.dsig.internal.dom.DOMXPathFilter2Transform Maven / Gradle / Ivy

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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.
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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.
 */
/*
 * ===========================================================================
 *
 * (C) Copyright IBM Corp. 2003 All Rights Reserved.
 *
 * ===========================================================================
 */
/*
 * Portions copyright 2005 Sun Microsystems, Inc. All rights reserved.
 */
/*
 * $Id: DOMXPathFilter2Transform.java 1680217 2015-05-19 09:38:08Z coheigea $
 */
package org.apache.jcp.xml.dsig.internal.dom;

import javax.xml.crypto.*;
import javax.xml.crypto.dsig.*;
import javax.xml.crypto.dsig.spec.TransformParameterSpec;
import javax.xml.crypto.dsig.spec.XPathType;
import javax.xml.crypto.dsig.spec.XPathFilter2ParameterSpec;
import java.security.InvalidAlgorithmParameterException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;

/**
 * DOM-based implementation of XPath Filter 2.0 Transform.
 * (Uses Apache XML-Sec Transform implementation)
 *
 * @author Joyce Leung
 */
public final class DOMXPathFilter2Transform extends ApacheTransform {

    @Override
    public void init(TransformParameterSpec params)
        throws InvalidAlgorithmParameterException
    {
        if (params == null) {
            throw new InvalidAlgorithmParameterException("params are required");
        } else if (!(params instanceof XPathFilter2ParameterSpec)) {
            throw new InvalidAlgorithmParameterException
                ("params must be of type XPathFilter2ParameterSpec");
        }
        this.params = params;
    }

    @Override
    public void init(XMLStructure parent, XMLCryptoContext context)
        throws InvalidAlgorithmParameterException
    {
        super.init(parent, context);
        try {
            unmarshalParams(DOMUtils.getFirstChildElement(transformElem));
        } catch (MarshalException me) {
            throw new InvalidAlgorithmParameterException(me);
        }
    }

    private void unmarshalParams(Element curXPathElem) throws MarshalException
    {
        List list = new ArrayList();
        Element currentElement = curXPathElem;
        while (currentElement != null) {
            String xPath = currentElement.getFirstChild().getNodeValue();
            String filterVal = DOMUtils.getAttributeValue(currentElement,
                                                          "Filter");
            if (filterVal == null) {
                throw new MarshalException("filter cannot be null");
            }
            XPathType.Filter filter = null;
            if (filterVal.equals("intersect")) {
                filter = XPathType.Filter.INTERSECT;
            } else if (filterVal.equals("subtract")) {
                filter = XPathType.Filter.SUBTRACT;
            } else if (filterVal.equals("union")) {
                filter = XPathType.Filter.UNION;
            } else {
                throw new MarshalException("Unknown XPathType filter type" +
                                           filterVal);
            }
            NamedNodeMap attributes = currentElement.getAttributes();
            if (attributes != null) {
                int length = attributes.getLength();
                Map namespaceMap =
                    new HashMap(length);
                for (int i = 0; i < length; i++) {
                    Attr attr = (Attr)attributes.item(i);
                    String prefix = attr.getPrefix();
                    if (prefix != null && prefix.equals("xmlns")) {
                        namespaceMap.put(attr.getLocalName(), attr.getValue());
                    }
                }
                list.add(new XPathType(xPath, filter, namespaceMap));
            } else {
                list.add(new XPathType(xPath, filter));
            }

            currentElement = DOMUtils.getNextSiblingElement(currentElement);
        }
        this.params = new XPathFilter2ParameterSpec(list);
    }

    @Override
    public void marshalParams(XMLStructure parent, XMLCryptoContext context)
        throws MarshalException
    {
        super.marshalParams(parent, context);
        XPathFilter2ParameterSpec xp =
            (XPathFilter2ParameterSpec)getParameterSpec();
        String prefix = DOMUtils.getNSPrefix(context, Transform.XPATH2);
        String qname = prefix == null || prefix.length() == 0 
                       ? "xmlns" : "xmlns:" + prefix;
        @SuppressWarnings("unchecked")
        List xpathList = xp.getXPathList();
        for (XPathType xpathType : xpathList) {
            Element elem = DOMUtils.createElement(ownerDoc, "XPath",
                                                  Transform.XPATH2, prefix);
            elem.appendChild
                (ownerDoc.createTextNode(xpathType.getExpression()));
            DOMUtils.setAttribute(elem, "Filter",
                                  xpathType.getFilter().toString());
            elem.setAttributeNS("http://www.w3.org/2000/xmlns/", qname,
                                Transform.XPATH2);

            // add namespace attributes, if necessary
            @SuppressWarnings("unchecked")
            Set> entries =
                xpathType.getNamespaceMap().entrySet();
            for (Map.Entry entry : entries) {
                elem.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:" +
                                    entry.getKey(),
                                    entry.getValue());
            }

            transformElem.appendChild(elem);
        }
    }
}