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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.
/**
* 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.xml.security.c14n.implementations;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.xml.security.c14n.CanonicalizationException;
import org.apache.xml.security.c14n.helper.C14nHelper;
import org.apache.xml.security.signature.XMLSignatureInput;
import org.apache.xml.security.utils.Constants;
import org.apache.xml.security.utils.XMLUtils;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;
/**
* Implements Canonical
* XML Version 1.0, a W3C Recommendation from 15 March 2001.
*
* @author Christian Geuer-Pollmann
*/
public abstract class Canonicalizer20010315 extends CanonicalizerBase {
private static final String XMLNS_URI = Constants.NamespaceSpecNS;
private static final String XML_LANG_URI = Constants.XML_LANG_SPACE_SpecNS;
private boolean firstCall = true;
private final SortedSet result = new TreeSet(COMPARE);
private static class XmlAttrStack {
static class XmlsStackElement {
int level;
boolean rendered = false;
List nodes = new ArrayList();
};
int currentLevel = 0;
int lastlevel = 0;
XmlsStackElement cur;
List levels = new ArrayList();
void push(int level) {
currentLevel = level;
if (currentLevel == -1) {
return;
}
cur = null;
while (lastlevel >= currentLevel) {
levels.remove(levels.size() - 1);
int newSize = levels.size();
if (newSize == 0) {
lastlevel = 0;
return;
}
lastlevel = (levels.get(newSize - 1)).level;
}
}
void addXmlnsAttr(Attr n) {
if (cur == null) {
cur = new XmlsStackElement();
cur.level = currentLevel;
levels.add(cur);
lastlevel = currentLevel;
}
cur.nodes.add(n);
}
void getXmlnsAttr(Collection col) {
int size = levels.size() - 1;
if (cur == null) {
cur = new XmlsStackElement();
cur.level = currentLevel;
lastlevel = currentLevel;
levels.add(cur);
}
boolean parentRendered = false;
XmlsStackElement e = null;
if (size == -1) {
parentRendered = true;
} else {
e = levels.get(size);
if (e.rendered && e.level + 1 == currentLevel) {
parentRendered = true;
}
}
if (parentRendered) {
col.addAll(cur.nodes);
cur.rendered = true;
return;
}
Map loa = new HashMap();
for (; size >= 0; size--) {
e = levels.get(size);
Iterator it = e.nodes.iterator();
while (it.hasNext()) {
Attr n = it.next();
if (!loa.containsKey(n.getName())) {
loa.put(n.getName(), n);
}
}
}
cur.rendered = true;
col.addAll(loa.values());
}
}
private XmlAttrStack xmlattrStack = new XmlAttrStack();
/**
* Constructor Canonicalizer20010315
*
* @param includeComments
*/
public Canonicalizer20010315(boolean includeComments) {
super(includeComments);
}
/**
* Always throws a CanonicalizationException because this is inclusive c14n.
*
* @param xpathNodeSet
* @param inclusiveNamespaces
* @return none it always fails
* @throws CanonicalizationException always
*/
public byte[] engineCanonicalizeXPathNodeSet(Set xpathNodeSet, String inclusiveNamespaces)
throws CanonicalizationException {
/** $todo$ well, should we throw UnsupportedOperationException ? */
throw new CanonicalizationException("c14n.Canonicalizer.UnsupportedOperation");
}
/**
* Always throws a CanonicalizationException because this is inclusive c14n.
*
* @param rootNode
* @param inclusiveNamespaces
* @return none it always fails
* @throws CanonicalizationException
*/
public byte[] engineCanonicalizeSubTree(Node rootNode, String inclusiveNamespaces)
throws CanonicalizationException {
/** $todo$ well, should we throw UnsupportedOperationException ? */
throw new CanonicalizationException("c14n.Canonicalizer.UnsupportedOperation");
}
/**
* Returns the Attr[]s to be output for the given element.
*
* The code of this method is a copy of {@link #handleAttributes(Element,
* NameSpaceSymbTable)},
* whereas it takes into account that subtree-c14n is -- well -- subtree-based.
* So if the element in question isRoot of c14n, it's parent is not in the
* node set, as well as all other ancestors.
*
* @param element
* @param ns
* @return the Attr[]s to be output
* @throws CanonicalizationException
*/
@Override
protected Iterator handleAttributesSubtree(Element element, NameSpaceSymbTable ns)
throws CanonicalizationException {
if (!element.hasAttributes() && !firstCall) {
return null;
}
// result will contain the attrs which have to be output
final SortedSet result = this.result;
result.clear();
if (element.hasAttributes()) {
NamedNodeMap attrs = element.getAttributes();
int attrsLength = attrs.getLength();
for (int i = 0; i < attrsLength; i++) {
Attr attribute = (Attr) attrs.item(i);
String NUri = attribute.getNamespaceURI();
String NName = attribute.getLocalName();
String NValue = attribute.getValue();
if (!XMLNS_URI.equals(NUri)) {
//It's not a namespace attr node. Add to the result and continue.
result.add(attribute);
} else if (!(XML.equals(NName) && XML_LANG_URI.equals(NValue))) {
//The default mapping for xml must not be output.
Node n = ns.addMappingAndRender(NName, NValue, attribute);
if (n != null) {
//Render the ns definition
result.add((Attr)n);
if (C14nHelper.namespaceIsRelative(attribute)) {
Object exArgs[] = { element.getTagName(), NName, attribute.getNodeValue() };
throw new CanonicalizationException(
"c14n.Canonicalizer.RelativeNamespace", exArgs
);
}
}
}
}
}
if (firstCall) {
//It is the first node of the subtree
//Obtain all the namespaces defined in the parents, and added to the output.
ns.getUnrenderedNodes(result);
//output the attributes in the xml namespace.
xmlattrStack.getXmlnsAttr(result);
firstCall = false;
}
return result.iterator();
}
/**
* Returns the Attr[]s to be output for the given element.
*
* IMPORTANT: This method expects to work on a modified DOM tree, i.e. a DOM which has
* been prepared using {@link org.apache.xml.security.utils.XMLUtils#circumventBug2650(
* org.w3c.dom.Document)}.
*
* @param element
* @param ns
* @return the Attr[]s to be output
* @throws CanonicalizationException
*/
@Override
protected Iterator handleAttributes(Element element, NameSpaceSymbTable ns)
throws CanonicalizationException {
// result will contain the attrs which have to be output
xmlattrStack.push(ns.getLevel());
boolean isRealVisible = isVisibleDO(element, ns.getLevel()) == 1;
final SortedSet result = this.result;
result.clear();
if (element.hasAttributes()) {
NamedNodeMap attrs = element.getAttributes();
int attrsLength = attrs.getLength();
for (int i = 0; i < attrsLength; i++) {
Attr attribute = (Attr) attrs.item(i);
String NUri = attribute.getNamespaceURI();
String NName = attribute.getLocalName();
String NValue = attribute.getValue();
if (!XMLNS_URI.equals(NUri)) {
//A non namespace definition node.
if (XML_LANG_URI.equals(NUri)) {
xmlattrStack.addXmlnsAttr(attribute);
} else if (isRealVisible) {
//The node is visible add the attribute to the list of output attributes.
result.add(attribute);
}
} else if (!XML.equals(NName) || !XML_LANG_URI.equals(NValue)) {
/* except omit namespace node with local name xml, which defines
* the xml prefix, if its string value is http://www.w3.org/XML/1998/namespace.
*/
//add the prefix binding to the ns symb table.
if (isVisible(attribute)) {
if (isRealVisible || !ns.removeMappingIfRender(NName)) {
//The xpath select this node output it if needed.
Node n = ns.addMappingAndRender(NName, NValue, attribute);
if (n != null) {
result.add((Attr)n);
if (C14nHelper.namespaceIsRelative(attribute)) {
Object exArgs[] = { element.getTagName(), NName, attribute.getNodeValue() };
throw new CanonicalizationException(
"c14n.Canonicalizer.RelativeNamespace", exArgs
);
}
}
}
} else {
if (isRealVisible && !XMLNS.equals(NName)) {
ns.removeMapping(NName);
} else {
ns.addMapping(NName, NValue, attribute);
}
}
}
}
}
if (isRealVisible) {
//The element is visible, handle the xmlns definition
Attr xmlns = element.getAttributeNodeNS(XMLNS_URI, XMLNS);
Node n = null;
if (xmlns == null) {
//No xmlns def just get the already defined.
n = ns.getMapping(XMLNS);
} else if (!isVisible(xmlns)) {
//There is a definition but the xmlns is not selected by the xpath.
//then xmlns=""
n = ns.addMappingAndRender(XMLNS, "", nullNode);
}
//output the xmlns def if needed.
if (n != null) {
result.add((Attr)n);
}
//Float all xml:* attributes of the unselected parent elements to this one.
xmlattrStack.getXmlnsAttr(result);
ns.getUnrenderedNodes(result);
}
return result.iterator();
}
protected void circumventBugIfNeeded(XMLSignatureInput input)
throws CanonicalizationException, ParserConfigurationException, IOException, SAXException {
if (!input.isNeedsToBeExpanded()) {
return;
}
Document doc = null;
if (input.getSubNode() != null) {
doc = XMLUtils.getOwnerDocument(input.getSubNode());
} else {
doc = XMLUtils.getOwnerDocument(input.getNodeSet());
}
XMLUtils.circumventBug2650(doc);
}
@Override
protected void handleParent(Element e, NameSpaceSymbTable ns) {
if (!e.hasAttributes() && e.getNamespaceURI() == null) {
return;
}
xmlattrStack.push(-1);
NamedNodeMap attrs = e.getAttributes();
int attrsLength = attrs.getLength();
for (int i = 0; i < attrsLength; i++) {
Attr attribute = (Attr) attrs.item(i);
String NName = attribute.getLocalName();
String NValue = attribute.getNodeValue();
if (Constants.NamespaceSpecNS.equals(attribute.getNamespaceURI())) {
if (!XML.equals(NName) || !Constants.XML_LANG_SPACE_SpecNS.equals(NValue)) {
ns.addMapping(NName, NValue, attribute);
}
} else if (XML_LANG_URI.equals(attribute.getNamespaceURI())) {
xmlattrStack.addXmlnsAttr(attribute);
}
}
if (e.getNamespaceURI() != null) {
String NName = e.getPrefix();
String NValue = e.getNamespaceURI();
String Name;
if (NName == null || NName.equals("")) {
NName = "xmlns";
Name = "xmlns";
} else {
Name = "xmlns:" + NName;
}
Attr n = e.getOwnerDocument().createAttributeNS("http://www.w3.org/2000/xmlns/", Name);
n.setValue(NValue);
ns.addMapping(NName, NValue, n);
}
}
}
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