| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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.utils.resolver.implementations; |
| |
| |
| |
| import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput; |
| import com.sun.org.apache.xml.internal.security.utils.XMLUtils; |
| import com.sun.org.apache.xml.internal.security.utils.resolver.ResourceResolverException; |
| import com.sun.org.apache.xml.internal.security.utils.resolver.ResourceResolverSpi; |
| import org.w3c.dom.Attr; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.Node; |
| |
| |
| /** |
| * This resolver is used for resolving same-document URIs like URI="" of URI="#id". |
| * |
| * @author $Author: mullan $ |
| * @see <A HREF="http://www.w3.org/TR/xmldsig-core/#sec-ReferenceProcessingModel">The Reference processing model in the XML Signature spec</A> |
| * @see <A HREF="http://www.w3.org/TR/xmldsig-core/#sec-Same-Document">Same-Document URI-References in the XML Signature spec</A> |
| * @see <A HREF="http://www.ietf.org/rfc/rfc2396.txt">Section 4.2 of RFC 2396</A> |
| */ |
| public class ResolverFragment extends ResourceResolverSpi { |
| |
| /** {@link java.util.logging} logging facility */ |
| static java.util.logging.Logger log = |
| java.util.logging.Logger.getLogger( |
| ResolverFragment.class.getName()); |
| public boolean engineIsThreadSafe() { |
| return true; |
| } |
| /** |
| * Method engineResolve |
| * |
| * @inheritDoc |
| * @param uri |
| * @param baseURI |
| */ |
| public XMLSignatureInput engineResolve(Attr uri, String baseURI) |
| throws ResourceResolverException |
| { |
| String uriNodeValue = uri.getNodeValue(); |
| Document doc = uri.getOwnerElement().getOwnerDocument(); |
| |
| Node selectedElem = null; |
| if (uriNodeValue.equals("")) { |
| |
| /* |
| * Identifies the node-set (minus any comment nodes) of the XML |
| * resource containing the signature |
| */ |
| |
| log.log(java.util.logging.Level.FINE, "ResolverFragment with empty URI (means complete document)"); |
| selectedElem = doc; |
| } else { |
| |
| /* |
| * URI="#chapter1" |
| * Identifies a node-set containing the element with ID attribute |
| * value 'chapter1' of the XML resource containing the signature. |
| * XML Signature (and its applications) modify this node-set to |
| * include the element plus all descendents including namespaces and |
| * attributes -- but not comments. |
| */ |
| String id = uriNodeValue.substring(1); |
| |
| selectedElem = doc.getElementById(id); |
| if (selectedElem == null) { |
| Object exArgs[] = { id }; |
| throw new ResourceResolverException( |
| "signature.Verification.MissingID", exArgs, uri, baseURI); |
| } |
| if (secureValidation) { |
| Element start = uri.getOwnerDocument().getDocumentElement(); |
| if (!XMLUtils.protectAgainstWrappingAttack(start, id)) { |
| Object exArgs[] = { id }; |
| throw new ResourceResolverException( |
| "signature.Verification.MultipleIDs", exArgs, |
| uri, baseURI); |
| } |
| } |
| if (log.isLoggable(java.util.logging.Level.FINE)) |
| log.log(java.util.logging.Level.FINE, "Try to catch an Element with ID " + id + " and Element was " + selectedElem); |
| } |
| |
| XMLSignatureInput result = new XMLSignatureInput(selectedElem); |
| result.setExcludeComments(true); |
| |
| result.setMIMEType("text/xml"); |
| if (baseURI != null && baseURI.length() > 0) { |
| result.setSourceURI(baseURI.concat(uri.getNodeValue())); |
| } else { |
| result.setSourceURI(uri.getNodeValue()); |
| } |
| return result; |
| } |
| |
| /** |
| * Method engineCanResolve |
| * @inheritDoc |
| * @param uri |
| * @param BaseURI |
| * |
| */ |
| public boolean engineCanResolve(Attr uri, String BaseURI) { |
| |
| if (uri == null) { |
| log.log(java.util.logging.Level.FINE, "Quick fail for null uri"); |
| return false; |
| } |
| |
| String uriNodeValue = uri.getNodeValue(); |
| |
| if (uriNodeValue.equals("") || |
| ( |
| (uriNodeValue.charAt(0)=='#') |
| && !((uriNodeValue.charAt(1)=='x') && uriNodeValue.startsWith("#xpointer(")) |
| ) |
| ){ |
| if (log.isLoggable(java.util.logging.Level.FINE)) |
| log.log(java.util.logging.Level.FINE, "State I can resolve reference: \"" + uriNodeValue + "\""); |
| return true; |
| } |
| if (log.isLoggable(java.util.logging.Level.FINE)) |
| log.log(java.util.logging.Level.FINE, "Do not seem to be able to resolve reference: \"" + uriNodeValue + "\""); |
| return false; |
| } |
| |
| } |