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/*
 * Copyright 2005 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
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 *      http://www.apache.org/licenses/LICENSE-2.0
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/*
 * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
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/*
 * $Id: DOMExcC14NMethod.java,v 1.2 2008/07/24 15:20:32 mullan Exp $
 */
package org.jcp.xml.dsig.internal.dom;

import javax.xml.crypto.*;
import javax.xml.crypto.dsig.*;
import javax.xml.crypto.dsig.spec.C14NMethodParameterSpec;
import javax.xml.crypto.dsig.spec.ExcC14NParameterSpec;
import javax.xml.crypto.dsig.spec.TransformParameterSpec;

import java.security.InvalidAlgorithmParameterException;
import java.security.spec.AlgorithmParameterSpec;
import java.util.*;
import org.w3c.dom.Element;

import com.sun.org.apache.xml.internal.security.c14n.Canonicalizer;
import com.sun.org.apache.xml.internal.security.c14n.InvalidCanonicalizerException;

DOM-based implementation of CanonicalizationMethod for Exclusive Canonical XML algorithm (with or without comments). Uses Apache XML-Sec Canonicalizer.
Author:Sean Mullan
/** * DOM-based implementation of CanonicalizationMethod for Exclusive * Canonical XML algorithm (with or without comments). * Uses Apache XML-Sec Canonicalizer. * * @author Sean Mullan */
public final class DOMExcC14NMethod extends ApacheCanonicalizer { public void init(TransformParameterSpec params) throws InvalidAlgorithmParameterException { if (params != null) { if (!(params instanceof ExcC14NParameterSpec)) { throw new InvalidAlgorithmParameterException ("params must be of type ExcC14NParameterSpec"); } this.params = (C14NMethodParameterSpec) params; } } public void init(XMLStructure parent, XMLCryptoContext context) throws InvalidAlgorithmParameterException { super.init(parent, context); Element paramsElem = DOMUtils.getFirstChildElement(transformElem); if (paramsElem == null) { this.params = null; this.inclusiveNamespaces = null; return; } unmarshalParams(paramsElem); } private void unmarshalParams(Element paramsElem) { String prefixListAttr = paramsElem.getAttributeNS(null, "PrefixList"); this.inclusiveNamespaces = prefixListAttr; int begin = 0; int end = prefixListAttr.indexOf(' '); List prefixList = new ArrayList(); while (end != -1) { prefixList.add(prefixListAttr.substring(begin, end)); begin = end + 1; end = prefixListAttr.indexOf(' ', begin); } if (begin <= prefixListAttr.length()) { prefixList.add(prefixListAttr.substring(begin)); } this.params = new ExcC14NParameterSpec(prefixList); } public void marshalParams(XMLStructure parent, XMLCryptoContext context) throws MarshalException { super.marshalParams(parent, context); AlgorithmParameterSpec spec = getParameterSpec(); if (spec == null) { return; } String prefix = DOMUtils.getNSPrefix(context, CanonicalizationMethod.EXCLUSIVE); Element excElem = DOMUtils.createElement (ownerDoc, "InclusiveNamespaces", CanonicalizationMethod.EXCLUSIVE, prefix); if (prefix == null || prefix.length() == 0) { excElem.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns", CanonicalizationMethod.EXCLUSIVE); } else { excElem.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:" + prefix, CanonicalizationMethod.EXCLUSIVE); } ExcC14NParameterSpec params = (ExcC14NParameterSpec) spec; StringBuffer prefixListAttr = new StringBuffer(""); List prefixList = params.getPrefixList(); for (int i = 0, size = prefixList.size(); i < size; i++) { prefixListAttr.append((String) prefixList.get(i)); if (i < size - 1) { prefixListAttr.append(" "); } } DOMUtils.setAttribute(excElem, "PrefixList", prefixListAttr.toString()); this.inclusiveNamespaces = prefixListAttr.toString(); transformElem.appendChild(excElem); } public String getParamsNSURI() { return CanonicalizationMethod.EXCLUSIVE; } public Data transform(Data data, XMLCryptoContext xc) throws TransformException { // ignore comments if dereferencing same-document URI that require // you to omit comments, even if the Transform says otherwise - // this is to be compliant with section 4.3.3.3 of W3C Rec. if (data instanceof DOMSubTreeData) { DOMSubTreeData subTree = (DOMSubTreeData) data; if (subTree.excludeComments()) { try { apacheCanonicalizer = Canonicalizer.getInstance (CanonicalizationMethod.EXCLUSIVE); } catch (InvalidCanonicalizerException ice) { throw new TransformException ("Couldn't find Canonicalizer for: " + CanonicalizationMethod.EXCLUSIVE + ": " + ice.getMessage(), ice); } } } return canonicalize(data, xc); } }