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Java example source code file (Canonicalizer11.java)
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The Canonicalizer11.java Java example source code
/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/**
* 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 com.sun.org.apache.xml.internal.security.c14n.implementations;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
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.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;
import com.sun.org.apache.xml.internal.security.c14n.CanonicalizationException;
import com.sun.org.apache.xml.internal.security.c14n.helper.C14nHelper;
import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput;
import com.sun.org.apache.xml.internal.security.utils.Constants;
import com.sun.org.apache.xml.internal.security.utils.XMLUtils;
/**
* Implements <A HREF="http://www.w3.org/TR/2008/PR-xml-c14n11-20080129/">
* Canonical XML Version 1.1</A>, a W3C Proposed Recommendation from 29
* January 2008.
*
* @author Sean Mullan
* @author Raul Benito
*/
public abstract class Canonicalizer11 extends CanonicalizerBase {
private static final String XMLNS_URI = Constants.NamespaceSpecNS;
private static final String XML_LANG_URI = Constants.XML_LANG_SPACE_SpecNS;
private static java.util.logging.Logger log =
java.util.logging.Logger.getLogger(Canonicalizer11.class.getName());
private final SortedSet<Attr> result = new TreeSet(COMPARE);
private boolean firstCall = true;
private static class XmlAttrStack {
static class XmlsStackElement {
int level;
boolean rendered = false;
List<Attr> nodes = new ArrayList();
};
int currentLevel = 0;
int lastlevel = 0;
XmlsStackElement cur;
List<XmlsStackElement> 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<Attr> 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<String, Attr> loa = new HashMap();
List<Attr> baseAttrs = new ArrayList();
boolean successiveOmitted = true;
for (; size >= 0; size--) {
e = levels.get(size);
if (e.rendered) {
successiveOmitted = false;
}
Iterator<Attr> it = e.nodes.iterator();
while (it.hasNext() && successiveOmitted) {
Attr n = it.next();
if (n.getLocalName().equals("base") && !e.rendered) {
baseAttrs.add(n);
} else if (!loa.containsKey(n.getName())) {
loa.put(n.getName(), n);
}
}
}
if (!baseAttrs.isEmpty()) {
Iterator<Attr> it = col.iterator();
String base = null;
Attr baseAttr = null;
while (it.hasNext()) {
Attr n = it.next();
if (n.getLocalName().equals("base")) {
base = n.getValue();
baseAttr = n;
break;
}
}
it = baseAttrs.iterator();
while (it.hasNext()) {
Attr n = it.next();
if (base == null) {
base = n.getValue();
baseAttr = n;
} else {
try {
base = joinURI(n.getValue(), base);
} catch (URISyntaxException ue) {
if (log.isLoggable(java.util.logging.Level.FINE)) {
log.log(java.util.logging.Level.FINE, ue.getMessage(), ue);
}
}
}
}
if (base != null && base.length() != 0) {
baseAttr.setValue(base);
col.add(baseAttr);
}
}
cur.rendered = true;
col.addAll(loa.values());
}
};
private XmlAttrStack xmlattrStack = new XmlAttrStack();
/**
* Constructor Canonicalizer11
*
* @param includeComments
*/
public Canonicalizer11(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<Node> xpathNodeSet, String inclusiveNamespaces
) throws CanonicalizationException {
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 {
throw new CanonicalizationException("c14n.Canonicalizer.UnsupportedOperation");
}
/**
* Returns the Attr[]s to be output for the given element.
* <br>
* 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<Attr> 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<Attr> 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.
* <br>
* IMPORTANT: This method expects to work on a modified DOM tree, i.e. a
* DOM which has been prepared using
* {@link com.sun.org.apache.xml.internal.security.utils.XMLUtils#circumventBug2650(
* org.w3c.dom.Document)}.
*
* @param element
* @param ns
* @return the Attr[]s to be output
* @throws CanonicalizationException
*/
@Override
protected Iterator<Attr> 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<Attr> 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)) {
if (NName.equals("id")) {
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);
}
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);
}
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 (!"id".equals(NName) && 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);
}
}
private static String joinURI(String baseURI, String relativeURI) throws URISyntaxException {
String bscheme = null;
String bauthority = null;
String bpath = "";
String bquery = null;
// pre-parse the baseURI
if (baseURI != null) {
if (baseURI.endsWith("..")) {
baseURI = baseURI + "/";
}
URI base = new URI(baseURI);
bscheme = base.getScheme();
bauthority = base.getAuthority();
bpath = base.getPath();
bquery = base.getQuery();
}
URI r = new URI(relativeURI);
String rscheme = r.getScheme();
String rauthority = r.getAuthority();
String rpath = r.getPath();
String rquery = r.getQuery();
String tscheme, tauthority, tpath, tquery;
if (rscheme != null && rscheme.equals(bscheme)) {
rscheme = null;
}
if (rscheme != null) {
tscheme = rscheme;
tauthority = rauthority;
tpath = removeDotSegments(rpath);
tquery = rquery;
} else {
if (rauthority != null) {
tauthority = rauthority;
tpath = removeDotSegments(rpath);
tquery = rquery;
} else {
if (rpath.length() == 0) {
tpath = bpath;
if (rquery != null) {
tquery = rquery;
} else {
tquery = bquery;
}
} else {
if (rpath.startsWith("/")) {
tpath = removeDotSegments(rpath);
} else {
if (bauthority != null && bpath.length() == 0) {
tpath = "/" + rpath;
} else {
int last = bpath.lastIndexOf('/');
if (last == -1) {
tpath = rpath;
} else {
tpath = bpath.substring(0, last+1) + rpath;
}
}
tpath = removeDotSegments(tpath);
}
tquery = rquery;
}
tauthority = bauthority;
}
tscheme = bscheme;
}
return new URI(tscheme, tauthority, tpath, tquery, null).toString();
}
private static String removeDotSegments(String path) {
if (log.isLoggable(java.util.logging.Level.FINE)) {
log.log(java.util.logging.Level.FINE, "STEP OUTPUT BUFFER\t\tINPUT BUFFER");
}
// 1. The input buffer is initialized with the now-appended path
// components then replace occurrences of "//" in the input buffer
// with "/" until no more occurrences of "//" are in the input buffer.
String input = path;
while (input.indexOf("//") > -1) {
input = input.replaceAll("//", "/");
}
// Initialize the output buffer with the empty string.
StringBuilder output = new StringBuilder();
// If the input buffer starts with a root slash "/" then move this
// character to the output buffer.
if (input.charAt(0) == '/') {
output.append("/");
input = input.substring(1);
}
printStep("1 ", output.toString(), input);
// While the input buffer is not empty, loop as follows
while (input.length() != 0) {
// 2A. If the input buffer begins with a prefix of "./",
// then remove that prefix from the input buffer
// else if the input buffer begins with a prefix of "../", then
// if also the output does not contain the root slash "/" only,
// then move this prefix to the end of the output buffer else
// remove that prefix
if (input.startsWith("./")) {
input = input.substring(2);
printStep("2A", output.toString(), input);
} else if (input.startsWith("../")) {
input = input.substring(3);
if (!output.toString().equals("/")) {
output.append("../");
}
printStep("2A", output.toString(), input);
// 2B. if the input buffer begins with a prefix of "/./" or "/.",
// where "." is a complete path segment, then replace that prefix
// with "/" in the input buffer; otherwise,
} else if (input.startsWith("/./")) {
input = input.substring(2);
printStep("2B", output.toString(), input);
} else if (input.equals("/.")) {
// FIXME: what is complete path segment?
input = input.replaceFirst("/.", "/");
printStep("2B", output.toString(), input);
// 2C. if the input buffer begins with a prefix of "/../" or "/..",
// where ".." is a complete path segment, then replace that prefix
// with "/" in the input buffer and if also the output buffer is
// empty, last segment in the output buffer equals "../" or "..",
// where ".." is a complete path segment, then append ".." or "/.."
// for the latter case respectively to the output buffer else
// remove the last segment and its preceding "/" (if any) from the
// output buffer and if hereby the first character in the output
// buffer was removed and it was not the root slash then delete a
// leading slash from the input buffer; otherwise,
} else if (input.startsWith("/../")) {
input = input.substring(3);
if (output.length() == 0) {
output.append("/");
} else if (output.toString().endsWith("../")) {
output.append("..");
} else if (output.toString().endsWith("..")) {
output.append("/..");
} else {
int index = output.lastIndexOf("/");
if (index == -1) {
output = new StringBuilder();
if (input.charAt(0) == '/') {
input = input.substring(1);
}
} else {
output = output.delete(index, output.length());
}
}
printStep("2C", output.toString(), input);
} else if (input.equals("/..")) {
// FIXME: what is complete path segment?
input = input.replaceFirst("/..", "/");
if (output.length() == 0) {
output.append("/");
} else if (output.toString().endsWith("../")) {
output.append("..");
} else if (output.toString().endsWith("..")) {
output.append("/..");
} else {
int index = output.lastIndexOf("/");
if (index == -1) {
output = new StringBuilder();
if (input.charAt(0) == '/') {
input = input.substring(1);
}
} else {
output = output.delete(index, output.length());
}
}
printStep("2C", output.toString(), input);
// 2D. if the input buffer consists only of ".", then remove
// that from the input buffer else if the input buffer consists
// only of ".." and if the output buffer does not contain only
// the root slash "/", then move the ".." to the output buffer
// else delte it.; otherwise,
} else if (input.equals(".")) {
input = "";
printStep("2D", output.toString(), input);
} else if (input.equals("..")) {
if (!output.toString().equals("/")) {
output.append("..");
}
input = "";
printStep("2D", output.toString(), input);
// 2E. move the first path segment (if any) in the input buffer
// to the end of the output buffer, including the initial "/"
// character (if any) and any subsequent characters up to, but not
// including, the next "/" character or the end of the input buffer.
} else {
int end = -1;
int begin = input.indexOf('/');
if (begin == 0) {
end = input.indexOf('/', 1);
} else {
end = begin;
begin = 0;
}
String segment;
if (end == -1) {
segment = input.substring(begin);
input = "";
} else {
segment = input.substring(begin, end);
input = input.substring(end);
}
output.append(segment);
printStep("2E", output.toString(), input);
}
}
// 3. Finally, if the only or last segment of the output buffer is
// "..", where ".." is a complete path segment not followed by a slash
// then append a slash "/". The output buffer is returned as the result
// of remove_dot_segments
if (output.toString().endsWith("..")) {
output.append("/");
printStep("3 ", output.toString(), input);
}
return output.toString();
}
private static void printStep(String step, String output, String input) {
if (log.isLoggable(java.util.logging.Level.FINE)) {
log.log(java.util.logging.Level.FINE, " " + step + ": " + output);
if (output.length() == 0) {
log.log(java.util.logging.Level.FINE, "\t\t\t\t" + input);
} else {
log.log(java.util.logging.Level.FINE, "\t\t\t" + input);
}
}
}
}
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