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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.xml.security.c14n.implementations;
import java.io.IOException;
import java.io.OutputStream;
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.XMLUtils;
import org.w3c.dom.Attr;
import org.w3c.dom.DOMException;
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.
*
*/
public abstract class Canonicalizer20010315 extends CanonicalizerBase {
private boolean firstCall = true;
private final XmlAttrStack xmlattrStack;
private final boolean c14n11;
/**
* Constructor Canonicalizer20010315
*
* @param includeComments
*/
public Canonicalizer20010315(boolean includeComments) {
this(includeComments, false);
}
/**
* Constructor Canonicalizer20010315
*
* @param includeComments
* @param c14n11 Whether this is a Canonical XML 1.1 implementation or not
*/
public Canonicalizer20010315(boolean includeComments, boolean c14n11) {
super(includeComments);
xmlattrStack = new XmlAttrStack(c14n11);
this.c14n11 = c14n11;
}
/**
* 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");
}
/**
* 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, boolean propagateDefaultNamespace)
throws CanonicalizationException {
/** $todo$ well, should we throw UnsupportedOperationException ? */
throw new CanonicalizationException("c14n.Canonicalizer.UnsupportedOperation");
}
/**
* Output the Attr[]s for the given element.
*
* The code of this method is a copy of {@link #outputAttributes(Element,
* NameSpaceSymbTable, Map)},
* 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
* @param cache
* @throws CanonicalizationException, DOMException, IOException
*/
@Override
protected void outputAttributesSubtree(Element element, NameSpaceSymbTable ns,
Map cache)
throws CanonicalizationException, DOMException, IOException {
if (!element.hasAttributes() && !firstCall) {
return;
}
// result will contain the attrs which have to be output
SortedSet result = new TreeSet(COMPARE);
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;
}
OutputStream writer = getWriter();
//we output all Attrs which are available
for (Attr attr : result) {
outputAttrToWriter(attr.getNodeName(), attr.getNodeValue(), writer, cache);
}
}
/**
* Output the Attr[]s 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
* @param cache
* @throws CanonicalizationException, DOMException, IOException
*/
@Override
protected void outputAttributes(Element element, NameSpaceSymbTable ns,
Map cache)
throws CanonicalizationException, DOMException, IOException {
// result will contain the attrs which have to be output
xmlattrStack.push(ns.getLevel());
boolean isRealVisible = isVisibleDO(element, ns.getLevel()) == 1;
SortedSet result = new TreeSet(COMPARE);
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)) {
if (c14n11 && "id".equals(NName)) {
if (isRealVisible) {
// treat xml:id like any other attribute
// (emit it, but don't inherit it)
result.add(attribute);
}
} else {
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, "", getNullNode(xmlns.getOwnerDocument()));
}
//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);
}
OutputStream writer = getWriter();
//we output all Attrs which are available
for (Attr attr : result) {
outputAttrToWriter(attr.getNodeName(), attr.getNodeValue(), writer, cache);
}
}
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 (XMLNS_URI.equals(attribute.getNamespaceURI())) {
if (!XML.equals(NName) || !XML_LANG_URI.equals(NValue)) {
ns.addMapping(NName, NValue, attribute);
}
} else if (XML_LANG_URI.equals(attribute.getNamespaceURI())
&& (!c14n11 || !"id".equals(NName))) {
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);
}
}
}
