/*
* Copyright 1999-2004 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 com.sun.org.apache.xml.internal.security.c14n;
import java.io.ByteArrayInputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import com.sun.org.apache.xml.internal.security.exceptions.AlgorithmAlreadyRegisteredException;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
/**
*
*
* @author Christian Geuer-Pollmann
*/
public class Canonicalizer {
//J-
/** The output encoding of canonicalized data */
public static final String ENCODING = "UTF8";
/**
* XPath Expresion for selecting every node and continuos comments joined in only one node
*/
public static final String XPATH_C14N_WITH_COMMENTS_SINGLE_NODE = "(.//. | .//@* | .//namespace::*)";
/**
* The URL defined in XML-SEC Rec for inclusive c14n <b>without</b> comments.
*/
public static final String ALGO_ID_C14N_OMIT_COMMENTS = "http://www.w3.org/TR/2001/REC-xml-c14n-20010315";
/**
* The URL defined in XML-SEC Rec for inclusive c14n <b>with</b> comments.
*/
public static final String ALGO_ID_C14N_WITH_COMMENTS = ALGO_ID_C14N_OMIT_COMMENTS + "#WithComments";
/**
* The URL defined in XML-SEC Rec for exclusive c14n <b>without</b> comments.
*/
public static final String ALGO_ID_C14N_EXCL_OMIT_COMMENTS = "http://www.w3.org/2001/10/xml-exc-c14n#";
/**
* The URL defined in XML-SEC Rec for exclusive c14n <b>with</b> comments.
*/
public static final String ALGO_ID_C14N_EXCL_WITH_COMMENTS = ALGO_ID_C14N_EXCL_OMIT_COMMENTS + "WithComments";
static boolean _alreadyInitialized = false;
static Map _canonicalizerHash = null;
protected CanonicalizerSpi canonicalizerSpi = null;
//J+
/**
* Method init
*
*/
public static void init() {
if (!Canonicalizer._alreadyInitialized) {
Canonicalizer._canonicalizerHash = new HashMap(10);
Canonicalizer._alreadyInitialized = true;
}
}
/**
* Constructor Canonicalizer
*
* @param algorithmURI
* @throws InvalidCanonicalizerException
*/
private Canonicalizer(String algorithmURI)
throws InvalidCanonicalizerException {
try {
Class implementingClass = getImplementingClass(algorithmURI);
this.canonicalizerSpi =
(CanonicalizerSpi) implementingClass.newInstance();
this.canonicalizerSpi.reset=true;
} catch (Exception e) {
Object exArgs[] = { algorithmURI };
throw new InvalidCanonicalizerException(
"signature.Canonicalizer.UnknownCanonicalizer", exArgs);
}
}
/**
* Method getInstance
*
* @param algorithmURI
* @return a Conicicalizer instance ready for the job
* @throws InvalidCanonicalizerException
*/
public static final Canonicalizer getInstance(String algorithmURI)
throws InvalidCanonicalizerException {
Canonicalizer c14nizer = new Canonicalizer(algorithmURI);
return c14nizer;
}
/**
* Method register
*
* @param algorithmURI
* @param implementingClass
* @throws AlgorithmAlreadyRegisteredException
*/
public static void register(String algorithmURI, String implementingClass)
throws AlgorithmAlreadyRegisteredException {
// check whether URI is already registered
Class registeredClass = getImplementingClass(algorithmURI);
if (registeredClass != null) {
Object exArgs[] = { algorithmURI, registeredClass };
throw new AlgorithmAlreadyRegisteredException(
"algorithm.alreadyRegistered", exArgs);
}
try {
_canonicalizerHash.put(algorithmURI, Class.forName(implementingClass));
} catch (ClassNotFoundException e) {
throw new RuntimeException("c14n class not found");
}
}
/**
* Method getURI
*
* @return the URI defined for this c14n instance.
*/
public final String getURI() {
return this.canonicalizerSpi.engineGetURI();
}
/**
* Method getIncludeComments
*
* @return true if the c14n respect the comments.
*/
public boolean getIncludeComments() {
return this.canonicalizerSpi.engineGetIncludeComments();
}
/**
* This method tries to canonicalize the given bytes. It's possible to even
* canonicalize non-wellformed sequences if they are well-formed after being
* wrapped with a <CODE>>a<...>/a<</CODE>.
*
* @param inputBytes
* @return the result of the conicalization.
* @throws CanonicalizationException
* @throws java.io.IOException
* @throws javax.xml.parsers.ParserConfigurationException
* @throws org.xml.sax.SAXException
*/
public byte[] canonicalize(byte[] inputBytes)
throws javax.xml.parsers.ParserConfigurationException,
java.io.IOException, org.xml.sax.SAXException,
CanonicalizationException {
ByteArrayInputStream bais = new ByteArrayInputStream(inputBytes);
InputSource in = new InputSource(bais);
DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
dfactory.setNamespaceAware(true);
// needs to validate for ID attribute nomalization
dfactory.setValidating(true);
DocumentBuilder db = dfactory.newDocumentBuilder();
/*
* for some of the test vectors from the specification,
* there has to be a validatin parser for ID attributes, default
* attribute values, NMTOKENS, etc.
* Unfortunaltely, the test vectors do use different DTDs or
* even no DTD. So Xerces 1.3.1 fires many warnings about using
* ErrorHandlers.
*
* Text from the spec:
*
* The input octet stream MUST contain a well-formed XML document,
* but the input need not be validated. However, the attribute
* value normalization and entity reference resolution MUST be
* performed in accordance with the behaviors of a validating
* XML processor. As well, nodes for default attributes (declared
* in the ATTLIST with an AttValue but not specified) are created
* in each element. Thus, the declarations in the document type
* declaration are used to help create the canonical form, even
* though the document type declaration is not retained in the
* canonical form.
*
*/
db.setErrorHandler(new com.sun.org.apache.xml.internal.security.utils
.IgnoreAllErrorHandler());
Document document = db.parse(in);
byte result[] = this.canonicalizeSubtree(document);
return result;
}
/**
* Canonicalizes the subtree rooted by <CODE>node</CODE>.
*
* @param node The node to canicalize
* @return the result of the c14n.
*
* @throws CanonicalizationException
*/
public byte[] canonicalizeSubtree(Node node)
throws CanonicalizationException {
return this.canonicalizerSpi.engineCanonicalizeSubTree(node);
}
/**
* Canonicalizes the subtree rooted by <CODE>node</CODE>.
*
* @param node
* @param inclusiveNamespaces
* @return the result of the c14n.
* @throws CanonicalizationException
*/
public byte[] canonicalizeSubtree(Node node, String inclusiveNamespaces)
throws CanonicalizationException {
return this.canonicalizerSpi.engineCanonicalizeSubTree(node,
inclusiveNamespaces);
}
/**
* Canonicalizes an XPath node set. The <CODE>xpathNodeSet</CODE> is treated
* as a list of XPath nodes, not as a list of subtrees.
*
* @param xpathNodeSet
* @return the result of the c14n.
* @throws CanonicalizationException
*/
public byte[] canonicalizeXPathNodeSet(NodeList xpathNodeSet)
throws CanonicalizationException {
return this.canonicalizerSpi.engineCanonicalizeXPathNodeSet(xpathNodeSet);
}
/**
* Canonicalizes an XPath node set. The <CODE>xpathNodeSet</CODE> is treated
* as a list of XPath nodes, not as a list of subtrees.
*
* @param xpathNodeSet
* @param inclusiveNamespaces
* @return the result of the c14n.
* @throws CanonicalizationException
*/
public byte[] canonicalizeXPathNodeSet(
NodeList xpathNodeSet, String inclusiveNamespaces)
throws CanonicalizationException {
return this.canonicalizerSpi.engineCanonicalizeXPathNodeSet(xpathNodeSet,
inclusiveNamespaces);
}
/**
* Canonicalizes an XPath node set.
*
* @param xpathNodeSet
* @return the result of the c14n.
* @throws CanonicalizationException
*/
public byte[] canonicalizeXPathNodeSet(Set xpathNodeSet)
throws CanonicalizationException {
return this.canonicalizerSpi.engineCanonicalizeXPathNodeSet(xpathNodeSet);
}
/**
* Canonicalizes an XPath node set.
*
* @param xpathNodeSet
* @param inclusiveNamespaces
* @return the result of the c14n.
* @throws CanonicalizationException
*/
public byte[] canonicalizeXPathNodeSet(
Set xpathNodeSet, String inclusiveNamespaces)
throws CanonicalizationException {
return this.canonicalizerSpi.engineCanonicalizeXPathNodeSet(xpathNodeSet,
inclusiveNamespaces);
}
/**
* Sets the writter where the cannocalization ends. ByteArrayOutputStream if
* none is setted.
* @param os
*/
public void setWriter(OutputStream os) {
this.canonicalizerSpi.setWriter(os);
}
/**
* Returns the name of the implementing {@link CanonicalizerSpi} class
*
* @return the name of the implementing {@link CanonicalizerSpi} class
*/
public String getImplementingCanonicalizerClass() {
return this.canonicalizerSpi.getClass().getName();
}
/**
* Method getImplementingClass
*
* @param URI
* @return the name of the class that implements the give URI
*/
private static Class getImplementingClass(String URI) {
return (Class) _canonicalizerHash.get(URI);
}
/**
* Set the canonicalizator behaviour to not reset.
*
*/
public void notReset() {
this.canonicalizerSpi.reset=false;
}
}
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