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The Apache WSS4J project provides a Java implementation of the primary security standards
for Web Services, namely the OASIS Web Services Security (WS-Security) specifications
from the OASIS Web Services Security TC.
/*
* Copyright 2003-2004 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.
*
*/
package org.apache.ws.security.util;
import org.apache.ws.security.WSConstants;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
/**
* This class is a utility to serialize a DOM node as XML. This class
* uses the DOM Level 2 APIs.
* The main difference between this class and DOMWriter is that this class
* generates and prints out namespace declarations.
*
* @author Matthew J. Duftler ([email protected])
* @author Joseph Kesselman
*/
public class DOM2Writer {
public static final char NL = '\n';
public static final String LS = System.getProperty("line.separator",
(new Character(NL)).toString());
/**
* Return a string containing this node serialized as XML.
*/
public static String nodeToString(Node node) {
StringWriter sw = new StringWriter();
serializeAsXML(node, sw, true);
return sw.toString();
}
/**
* Return a string containing this node serialized as XML.
*/
public static String nodeToString(Node node, boolean omitXMLDecl) {
StringWriter sw = new StringWriter();
serializeAsXML(node, sw, omitXMLDecl);
return sw.toString();
}
/**
* Serialize this node into the writer as XML.
*/
public static void serializeAsXML(Node node, Writer writer,
boolean omitXMLDecl) {
serializeAsXML(node, writer, omitXMLDecl, false);
}
/**
* Serialize this node into the writer as XML.
*/
public static void serializeAsXML(Node node, Writer writer,
boolean omitXMLDecl,
boolean pretty) {
PrintWriter out = new PrintWriter(writer);
if (!omitXMLDecl) {
out.print("");
}
NSStack namespaceStack = new NSStack();
print(node, namespaceStack, out, pretty, 0);
out.flush();
}
private static void print(Node node, NSStack namespaceStack,
PrintWriter out, boolean pretty,
int indent) {
if (node == null) {
return;
}
boolean hasChildren = false;
int type = node.getNodeType();
switch (type) {
case Node.DOCUMENT_NODE:
{
NodeList children = node.getChildNodes();
if (children != null) {
int numChildren = children.getLength();
for (int i = 0; i < numChildren; i++) {
print(children.item(i), namespaceStack, out,
pretty, indent);
}
}
break;
}
case Node.ELEMENT_NODE:
{
namespaceStack.push();
if (pretty) {
for (int i = 0; i < indent; i++)
out.print(' ');
}
out.print('<' + node.getNodeName());
String elPrefix = node.getPrefix();
String elNamespaceURI = node.getNamespaceURI();
if (elPrefix != null &&
elNamespaceURI != null &&
elPrefix.length() > 0) {
boolean prefixIsDeclared = false;
try {
String namespaceURI = namespaceStack.getNamespaceURI(elPrefix);
if (elNamespaceURI.equals(namespaceURI)) {
prefixIsDeclared = true;
}
} catch (IllegalArgumentException e) {
}
if (!prefixIsDeclared) {
printNamespaceDecl(node, namespaceStack, out);
}
}
NamedNodeMap attrs = node.getAttributes();
int len = (attrs != null) ? attrs.getLength() : 0;
for (int i = 0; i < len; i++) {
Attr attr = (Attr) attrs.item(i);
out.print(' ' + attr.getNodeName() + "=\"");
normalize(attr.getValue(), out);
out.print('\"');
String attrPrefix = attr.getPrefix();
String attrNamespaceURI = attr.getNamespaceURI();
if (attrPrefix != null && attrNamespaceURI != null) {
boolean prefixIsDeclared = false;
try {
String namespaceURI = namespaceStack.getNamespaceURI(attrPrefix);
if (attrNamespaceURI.equals(namespaceURI)) {
prefixIsDeclared = true;
}
} catch (IllegalArgumentException e) {
}
if (!prefixIsDeclared) {
printNamespaceDecl(attr, namespaceStack, out);
}
}
}
NodeList children = node.getChildNodes();
if (children != null) {
int numChildren = children.getLength();
hasChildren = (numChildren > 0);
if (hasChildren) {
out.print('>');
if (pretty)
out.print(LS);
}
for (int i = 0; i < numChildren; i++) {
print(children.item(i), namespaceStack, out, pretty,
indent + 1);
}
} else {
hasChildren = false;
}
if (!hasChildren) {
out.print("/>");
if (pretty)
out.print(LS);
}
namespaceStack.pop();
break;
}
case Node.ENTITY_REFERENCE_NODE:
{
out.print('&');
out.print(node.getNodeName());
out.print(';');
break;
}
case Node.CDATA_SECTION_NODE:
{
out.print("");
break;
}
case Node.TEXT_NODE:
{
normalize(node.getNodeValue(), out);
break;
}
case Node.COMMENT_NODE:
{
out.print("");
if (pretty)
out.print(LS);
break;
}
case Node.PROCESSING_INSTRUCTION_NODE:
{
out.print(" 0) {
out.print(' ');
out.print(data);
}
out.println("?>");
if (pretty)
out.print(LS);
break;
}
}
if (type == Node.ELEMENT_NODE && hasChildren == true) {
if (pretty) {
for (int i = 0; i < indent; i++)
out.print(' ');
}
out.print("');
if (pretty)
out.print(LS);
hasChildren = false;
}
}
private static void printNamespaceDecl(Node node,
NSStack namespaceStack,
PrintWriter out) {
switch (node.getNodeType()) {
case Node.ATTRIBUTE_NODE:
{
printNamespaceDecl(((Attr) node).getOwnerElement(), node,
namespaceStack, out);
break;
}
case Node.ELEMENT_NODE:
{
printNamespaceDecl((Element) node, node, namespaceStack, out);
break;
}
}
}
private static void printNamespaceDecl(Element owner, Node node,
NSStack namespaceStack,
PrintWriter out) {
String namespaceURI = node.getNamespaceURI();
String prefix = node.getPrefix();
if (!(namespaceURI.equals(WSConstants.XMLNS_NS) && prefix.equals("xmlns")) &&
!(namespaceURI.equals(WSConstants.XML_NS) && prefix.equals("xml"))) {
if (WSSecurityUtil.getNamespace(prefix, owner) == null) {
out.print(" xmlns:" + prefix + "=\"" + namespaceURI + '\"');
}
} else {
prefix = node.getLocalName();
namespaceURI = node.getNodeValue();
}
namespaceStack.add(namespaceURI, prefix);
}
/**
* Normalizes and prints the given string.
*/
public static void normalize(String s, PrintWriter fOut) {
int len = (s != null) ? s.length() : 0;
for (int i = 0; i < len; i++) {
char c = s.charAt(i);
switch (c) {
case '<':
{
fOut.print("<");
break;
}
case '>':
{
fOut.print(">");
break;
}
case '&':
{
fOut.print("&");
break;
}
case '"':
{
fOut.print(""");
break;
}
case '\r':
case '\n':
default:
{
fOut.print(c);
}
}
}
}
}