org.apache.jcp.xml.dsig.internal.dom.DOMURIDereferencer Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of xmlsec Show documentation

Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

There is a newer version: 4.0.2

Show newest version

/**
 * 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.
 */
/*
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
 */
/*
 * $Id: DOMURIDereferencer.java 1709784 2015-10-21 10:02:22Z coheigea $
 */
package org.apache.jcp.xml.dsig.internal.dom;

import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import org.apache.xml.security.Init;
import org.apache.xml.security.utils.XMLUtils;
import org.apache.xml.security.utils.resolver.ResourceResolver;
import org.apache.xml.security.signature.XMLSignatureInput;

import javax.xml.crypto.*;
import javax.xml.crypto.dom.*;

/**
 * DOM-based implementation of URIDereferencer.
 *
 * @author Sean Mullan
 */
public final class DOMURIDereferencer implements URIDereferencer {

    static final URIDereferencer INSTANCE = new DOMURIDereferencer();

    private DOMURIDereferencer() {
        // need to call org.apache.xml.security.Init.init() 
        // before calling any apache security code
        Init.init();
    }

    @Override
    public Data dereference(URIReference uriRef, XMLCryptoContext context)
        throws URIReferenceException {

        if (uriRef == null) {
            throw new NullPointerException("uriRef cannot be null");
        }
        if (context == null) {
            throw new NullPointerException("context cannot be null");
        }

        DOMURIReference domRef = (DOMURIReference) uriRef;
        Attr uriAttr = (Attr) domRef.getHere();
        String uri = uriRef.getURI();
        DOMCryptoContext dcc = (DOMCryptoContext) context;
        String baseURI = context.getBaseURI();

        boolean secVal = Utils.secureValidation(context);

        // Check if same-document URI and already registered on the context
        if (uri != null && uri.length() != 0 && uri.charAt(0) == '#') {
            String id = uri.substring(1);

            if (id.startsWith("xpointer(id(")) {
                int i1 = id.indexOf('\'');
                int i2 = id.indexOf('\'', i1+1);
                id = id.substring(i1+1, i2);
            }

            Node referencedElem = dcc.getElementById(id);
            if (referencedElem != null) {
                if (secVal) {
                    Element start = referencedElem.getOwnerDocument().getDocumentElement();
                    if (!XMLUtils.protectAgainstWrappingAttack(start, (Element)referencedElem, id)) {
                        String error = "Multiple Elements with the same ID " + id + " were detected";
                        throw new URIReferenceException(error);
                    }
                }

                XMLSignatureInput result = new XMLSignatureInput(referencedElem);
                result.setSecureValidation(secVal);
                if (!uri.substring(1).startsWith("xpointer(id(")) {
                    result.setExcludeComments(true);
                }

                result.setMIMEType("text/xml");
                if (baseURI != null && baseURI.length() > 0) {
                    result.setSourceURI(baseURI.concat(uriAttr.getNodeValue()));
                } else {
                    result.setSourceURI(uriAttr.getNodeValue());
                }
                return new ApacheNodeSetData(result);
            }
        }

        try {
            ResourceResolver apacheResolver =
                ResourceResolver.getInstance(uriAttr, baseURI, secVal);
            XMLSignatureInput in = apacheResolver.resolve(uriAttr, baseURI, secVal);
            if (in.isOctetStream()) {
                return new ApacheOctetStreamData(in);
            } else {
                return new ApacheNodeSetData(in);
            }
        } catch (Exception e) {
            throw new URIReferenceException(e);
        }
    }
}