| /* |
| * Copyright 2005 The Apache Software Foundation. |
| * |
| * Licensed 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. |
| * |
| */ |
| /* |
| * Copyright 2005 Sun Microsystems, Inc. All rights reserved. |
| */ |
| /* |
| * $Id$ |
| */ |
| package org.jcp.xml.dsig.internal.dom; |
| |
| import java.util.*; |
| import java.security.spec.AlgorithmParameterSpec; |
| import org.w3c.dom.Attr; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| import javax.xml.crypto.*; |
| import javax.xml.crypto.dsig.dom.DOMSignContext; |
| import javax.xml.crypto.dsig.*; |
| import javax.xml.crypto.dsig.spec.*; |
| |
| import org.apache.xml.security.utils.IdResolver; |
| |
| /** |
| * Useful static DOM utility methods. |
| * |
| * @author Sean Mullan |
| */ |
| public class DOMUtils { |
| |
| // class cannot be instantiated |
| private DOMUtils() {} |
| |
| /** |
| * Returns the owner document of the specified node. |
| * |
| * @param node the node |
| * @return the owner document |
| */ |
| public static Document getOwnerDocument(Node node) { |
| if (node.getNodeType() == Node.DOCUMENT_NODE) { |
| return (Document) node; |
| } else { |
| return node.getOwnerDocument(); |
| } |
| } |
| |
| /** |
| * Creates an element in the specified namespace, with the specified tag |
| * and namespace prefix. |
| * |
| * @param doc the owner document |
| * @param tag the tag |
| * @param nsURI the namespace URI |
| * @param prefix the namespace prefix |
| * @return the newly created element |
| */ |
| public static Element createElement(Document doc, String tag, String nsURI, |
| String prefix) { |
| String qName = prefix == null ? tag : prefix + ":" + tag; |
| return doc.createElementNS(nsURI, qName); |
| } |
| |
| /** |
| * Sets an element's attribute (using DOM level 2) with the |
| * specified value and namespace prefix. |
| * |
| * @param elem the element to set the attribute on |
| * @param name the name of the attribute |
| * @param value the attribute value. If null, no attribute is set. |
| */ |
| public static void setAttribute(Element elem, String name, String value) { |
| if (value == null) return; |
| elem.setAttributeNS(null, name, value); |
| } |
| |
| /** |
| * Sets an element's attribute (using DOM level 2) with the |
| * specified value and namespace prefix AND registers the ID value with |
| * the specified element. This is for resolving same-document |
| * ID references. |
| * |
| * @param elem the element to set the attribute on |
| * @param name the name of the attribute |
| * @param value the attribute value. If null, no attribute is set. |
| */ |
| public static void setAttributeID(Element elem, String name, String value) { |
| if (value == null) return; |
| elem.setAttributeNS(null, name, value); |
| IdResolver.registerElementById(elem, value); |
| } |
| |
| /** |
| * Returns the first child element of the specified node, or null if there |
| * is no such element. |
| * |
| * @param node the node |
| * @return the first child element of the specified node, or null if there |
| * is no such element |
| * @throws NullPointerException if <code>node == null</code> |
| */ |
| public static Element getFirstChildElement(Node node) { |
| Node child = node.getFirstChild(); |
| while (child != null && child.getNodeType() != Node.ELEMENT_NODE) { |
| child = child.getNextSibling(); |
| } |
| return (Element) child; |
| } |
| |
| /** |
| * Returns the last child element of the specified node, or null if there |
| * is no such element. |
| * |
| * @param node the node |
| * @return the last child element of the specified node, or null if there |
| * is no such element |
| * @throws NullPointerException if <code>node == null</code> |
| */ |
| public static Element getLastChildElement(Node node) { |
| Node child = node.getLastChild(); |
| while (child != null && child.getNodeType() != Node.ELEMENT_NODE) { |
| child = child.getPreviousSibling(); |
| } |
| return (Element) child; |
| } |
| |
| /** |
| * Returns the next sibling element of the specified node, or null if there |
| * is no such element. |
| * |
| * @param node the node |
| * @return the next sibling element of the specified node, or null if there |
| * is no such element |
| * @throws NullPointerException if <code>node == null</code> |
| */ |
| public static Element getNextSiblingElement(Node node) { |
| Node sibling = node.getNextSibling(); |
| while (sibling != null && sibling.getNodeType() != Node.ELEMENT_NODE) { |
| sibling = sibling.getNextSibling(); |
| } |
| return (Element) sibling; |
| } |
| |
| /** |
| * Returns the attribute value for the attribute with the specified name. |
| * Returns null if there is no such attribute, or |
| * the empty string if the attribute value is empty. |
| * |
| * <p>This works around a limitation of the DOM |
| * <code>Element.getAttributeNode</code> method, which does not distinguish |
| * between an unspecified attribute and an attribute with a value of |
| * "" (it returns "" for both cases). |
| * |
| * @param elem the element containing the attribute |
| * @param name the name of the attribute |
| * @return the attribute value (may be null if unspecified) |
| */ |
| public static String getAttributeValue(Element elem, String name) { |
| Attr attr = elem.getAttributeNodeNS(null, name); |
| return (attr == null) ? null : attr.getValue(); |
| } |
| |
| /** |
| * Returns a Set of <code>Node</code>s, backed by the specified |
| * <code>NodeList</code>. |
| * |
| * @param nl the NodeList |
| * @return a Set of Nodes |
| */ |
| public static Set nodeSet(NodeList nl) { |
| return new NodeSet(nl); |
| } |
| |
| static class NodeSet extends AbstractSet { |
| private NodeList nl; |
| public NodeSet(NodeList nl) { |
| this.nl = nl; |
| } |
| |
| public int size() { return nl.getLength(); } |
| public Iterator iterator() { |
| return new Iterator() { |
| int index = 0; |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| public Object next() { |
| if (!hasNext()) { |
| throw new NoSuchElementException(); |
| } |
| return nl.item(index++); |
| } |
| public boolean hasNext() { |
| return index < nl.getLength() ? true : false; |
| } |
| }; |
| } |
| } |
| |
| /** |
| * Returns the prefix associated with the specified namespace URI |
| * |
| * @param context contains the namespace map |
| * @param nsURI the namespace URI |
| * @return the prefix associated with the specified namespace URI, or |
| * null if not set |
| */ |
| public static String getNSPrefix(XMLCryptoContext context, String nsURI) { |
| if (context != null) { |
| return context.getNamespacePrefix |
| (nsURI, context.getDefaultNamespacePrefix()); |
| } else { |
| return null; |
| } |
| } |
| |
| /** |
| * Returns the prefix associated with the XML Signature namespace URI |
| * |
| * @param context contains the namespace map |
| * @return the prefix associated with the specified namespace URI, or |
| * null if not set |
| */ |
| public static String getSignaturePrefix(XMLCryptoContext context) { |
| return getNSPrefix(context, XMLSignature.XMLNS); |
| } |
| |
| /** |
| * Removes all children nodes from the specified node. |
| * |
| * @param node the parent node whose children are to be removed |
| */ |
| public static void removeAllChildren(Node node) { |
| NodeList children = node.getChildNodes(); |
| for (int i = 0, length = children.getLength(); i < length; i++) { |
| node.removeChild(children.item(i)); |
| } |
| } |
| |
| /** |
| * Compares 2 nodes for equality. Implementation is not complete. |
| */ |
| public static boolean nodesEqual(Node thisNode, Node otherNode) { |
| if (thisNode == otherNode) { |
| return true; |
| } |
| if (thisNode.getNodeType() != otherNode.getNodeType()) { |
| return false; |
| } |
| // FIXME - test content, etc |
| return true; |
| } |
| |
| /** |
| * Checks if child element has same owner document before |
| * appending to the parent, and imports it to the parent's document |
| * if necessary. |
| */ |
| public static void appendChild(Node parent, Node child) { |
| Document ownerDoc = getOwnerDocument(parent); |
| if (child.getOwnerDocument() != ownerDoc) { |
| parent.appendChild(ownerDoc.importNode(child, true)); |
| } else { |
| parent.appendChild(child); |
| } |
| } |
| |
| public static boolean paramsEqual(AlgorithmParameterSpec spec1, |
| AlgorithmParameterSpec spec2) { |
| if (spec1 == spec2) { |
| return true; |
| } |
| if (spec1 instanceof XPathFilter2ParameterSpec && |
| spec2 instanceof XPathFilter2ParameterSpec) { |
| return paramsEqual((XPathFilter2ParameterSpec) spec1, |
| (XPathFilter2ParameterSpec) spec2); |
| } |
| if (spec1 instanceof ExcC14NParameterSpec && |
| spec2 instanceof ExcC14NParameterSpec) { |
| return paramsEqual((ExcC14NParameterSpec) spec1, |
| (ExcC14NParameterSpec) spec2); |
| } |
| if (spec1 instanceof XPathFilterParameterSpec && |
| spec2 instanceof XPathFilterParameterSpec) { |
| return paramsEqual((XPathFilterParameterSpec) spec1, |
| (XPathFilterParameterSpec) spec2); |
| } |
| if (spec1 instanceof XSLTTransformParameterSpec && |
| spec2 instanceof XSLTTransformParameterSpec) { |
| return paramsEqual((XSLTTransformParameterSpec) spec1, |
| (XSLTTransformParameterSpec) spec2); |
| } |
| return false; |
| } |
| |
| private static boolean paramsEqual(XPathFilter2ParameterSpec spec1, |
| XPathFilter2ParameterSpec spec2) { |
| |
| List types = spec1.getXPathList(); |
| List otypes = spec2.getXPathList(); |
| int size = types.size(); |
| if (size != otypes.size()) { |
| return false; |
| } |
| for (int i = 0; i < size; i++) { |
| XPathType type = (XPathType) types.get(i); |
| XPathType otype = (XPathType) otypes.get(i); |
| if (!type.getExpression().equals(otype.getExpression()) || |
| type.getFilter() != otype.getFilter()) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private static boolean paramsEqual(ExcC14NParameterSpec spec1, |
| ExcC14NParameterSpec spec2) { |
| return spec1.getPrefixList().equals(spec2.getPrefixList()); |
| } |
| |
| private static boolean paramsEqual(XPathFilterParameterSpec spec1, |
| XPathFilterParameterSpec spec2) { |
| |
| return spec1.getXPath().equals(spec2.getXPath()); |
| } |
| |
| private static boolean paramsEqual(XSLTTransformParameterSpec spec1, |
| XSLTTransformParameterSpec spec2) { |
| |
| XMLStructure ostylesheet = spec2.getStylesheet(); |
| if (!(ostylesheet instanceof javax.xml.crypto.dom.DOMStructure)) { |
| return false; |
| } |
| Node ostylesheetElem = |
| ((javax.xml.crypto.dom.DOMStructure) ostylesheet).getNode(); |
| XMLStructure stylesheet = spec1.getStylesheet(); |
| Node stylesheetElem = |
| ((javax.xml.crypto.dom.DOMStructure) stylesheet).getNode(); |
| return nodesEqual(stylesheetElem, ostylesheetElem); |
| } |
| } |