org.apache.xml.security.stax.impl.processor.input.XMLEventReaderInputProcessor Maven / Gradle / Ivy

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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.

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/**
 * 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.
 */
package org.apache.xml.security.stax.impl.processor.input;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.config.ConfigurationProperties;
import org.apache.xml.security.stax.ext.*;
import org.apache.xml.security.stax.ext.stax.XMLSecEvent;
import org.apache.xml.security.stax.ext.stax.XMLSecEventFactory;
import org.apache.xml.security.stax.ext.stax.XMLSecStartElement;

import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.util.NoSuchElementException;

/**
 * The XMLEventReaderInputProcessor reads requested XMLEvents from the original XMLEventReader
 * and returns them to the requester
 *
 * @author $Author: coheigea $
 * @version $Revision: 1676996 $ $Date: 2015-04-30 15:10:20 +0100 (Thu, 30 Apr 2015) $
 */
public class XMLEventReaderInputProcessor extends AbstractInputProcessor {

    private static final Integer maximumAllowedXMLStructureDepth =
            Integer.valueOf(ConfigurationProperties.getProperty("MaximumAllowedXMLStructureDepth"));
    private int currentXMLStructureDepth = 0;
    private final XMLStreamReader xmlStreamReader;
    private XMLSecStartElement parentXmlSecStartElement;
    private boolean EOF = false;

    public XMLEventReaderInputProcessor(XMLSecurityProperties securityProperties, XMLStreamReader xmlStreamReader) {
        super(securityProperties);
        setPhase(XMLSecurityConstants.Phase.PREPROCESSING);
        this.xmlStreamReader = xmlStreamReader;
    }

    @Override
    public XMLSecEvent processNextHeaderEvent(InputProcessorChain inputProcessorChain)
            throws XMLStreamException, XMLSecurityException {
        return processNextEventInternal();
    }

    @Override
    public XMLSecEvent processNextEvent(InputProcessorChain inputProcessorChain)
            throws XMLStreamException, XMLSecurityException {
        return processNextEventInternal();
    }

    private XMLSecEvent processNextEventInternal() throws XMLStreamException {
        XMLSecEvent xmlSecEvent = XMLSecEventFactory.allocate(xmlStreamReader, parentXmlSecStartElement);
        switch (xmlSecEvent.getEventType()) {
            case XMLStreamConstants.START_ELEMENT:
                currentXMLStructureDepth++;
                if (currentXMLStructureDepth > maximumAllowedXMLStructureDepth) {
                    XMLSecurityException xmlSecurityException = new XMLSecurityException(
                            "secureProcessing.MaximumAllowedXMLStructureDepth",
                            new Object[] {maximumAllowedXMLStructureDepth}
                    );
                    throw new XMLStreamException(xmlSecurityException);
                }

                parentXmlSecStartElement = (XMLSecStartElement) xmlSecEvent;
                break;
            case XMLStreamConstants.END_ELEMENT:
                currentXMLStructureDepth--;

                if (parentXmlSecStartElement != null) {
                    parentXmlSecStartElement = parentXmlSecStartElement.getParentXMLSecStartElement();
                }
                break;
        }
        if (xmlStreamReader.hasNext()) {
            xmlStreamReader.next();
        } else {
            if (EOF) {
                throw new NoSuchElementException();
            }
            EOF = true;
        }
        return xmlSecEvent;
    }

    @Override
    public void doFinal(InputProcessorChain inputProcessorChain) throws XMLStreamException, XMLSecurityException {
        //nothing to-do. Also don't call super.doFinal() we are the last processor
    }
}