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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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* KIND, either express or implied. See the License for the
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package org.apache.wink.common.internal.providers.entity;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Properties;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.apache.wink.common.RuntimeContext;
import org.apache.wink.common.internal.WinkConfiguration;
import org.apache.wink.common.internal.i18n.Messages;
import org.apache.wink.common.internal.runtime.RuntimeContextTLS;
import org.apache.wink.common.internal.utils.MediaTypeUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
public abstract class SourceProvider implements MessageBodyWriter {
private static TransformerFactory transformerFactory;
private static DocumentBuilderFactory documentBuilderFactory;
private static final Logger logger =
LoggerFactory
.getLogger(SourceProvider.class);
static {
transformerFactory = TransformerFactory.newInstance();
documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilderFactory.setNamespaceAware(true);
}
@Provider
@Consumes( {MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.WILDCARD})
@Produces( {MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.WILDCARD})
public static class StreamSourceProvider extends SourceProvider implements
MessageBodyReader {
public boolean isReadable(Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return (type.isAssignableFrom(StreamSource.class) && super.isReadable(mediaType));
}
public StreamSource readFrom(Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap httpHeaders,
InputStream entityStream) throws IOException,
WebApplicationException {
return new StreamSource(entityStream);
}
}
@Provider
@Consumes( {MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.WILDCARD})
@Produces( {MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.WILDCARD})
public static class SAXSourceProvider extends SourceProvider implements
MessageBodyReader {
public boolean isReadable(Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return (SAXSource.class == type && super.isReadable(mediaType));
}
public SAXSource readFrom(Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap httpHeaders,
InputStream entityStream) throws IOException,
WebApplicationException {
return new SAXSource(new InputSource(entityStream));
}
}
@Provider
@Consumes( {MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.WILDCARD})
@Produces( {MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.WILDCARD})
public static class DOMSourceProvider extends SourceProvider implements
MessageBodyReader {
public boolean isReadable(Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return (DOMSource.class == type && super.isReadable(mediaType));
}
private DocumentBuilder getDocumentBuilder() throws ParserConfigurationException {
RuntimeContext runtimeContext = RuntimeContextTLS.getRuntimeContext();
WinkConfiguration winkConfig = runtimeContext.getAttribute(WinkConfiguration.class);
if (winkConfig != null) {
Properties props = winkConfig.getProperties();
if (props != null) {
// use valueOf method to require the word "true"
if (Boolean.valueOf(props.getProperty("wink.supportDTDEntityExpansion"))) { //$NON-NLS-1$
return documentBuilderFactory.newDocumentBuilder();
}
}
}
try {
// important: keep this order
documentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
} catch (ParserConfigurationException e) {
// this should never happen if you run the SourceProviderTest unittests
logger.error(e.getMessage());
}
try {
// workaround for JDK5 bug that causes NPE in checking done due to above FEATURE_SECURE_PROCESSING
// For Apache Xerces-J: https://issues.apache.org/jira/browse/XERCESJ-977
documentBuilderFactory.setFeature("http://apache.org/xml/features/dom/defer-node-expansion", Boolean.FALSE); //$NON-NLS-1$
} catch (ParserConfigurationException e) {
// possible if not on apache parser? ignore...
}
DocumentBuilder dbuilder = documentBuilderFactory.newDocumentBuilder();
/*
* You might think you could just do this to prevent entity expansion:
* documentBuilderFactory.setExpandEntityReferences(false);
* In fact, you should not do that, because it will just increase the size
* of your DOMSource. We want to actively reject XML when a DTD is present, so...
*/
dbuilder.setEntityResolver(new EntityResolver() {
public InputSource resolveEntity(String name, String baseURI)
throws SAXException, IOException {
// we don't support entity resolution here
throw new SAXParseException(Messages.getMessage("entityRefsNotSupported"), null); //$NON-NLS-1$
}
});
return dbuilder;
}
public DOMSource readFrom(Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap httpHeaders,
InputStream entityStream) throws IOException,
WebApplicationException {
try {
DocumentBuilder dbuilder = getDocumentBuilder(); //documentBuilderFactory.newDocumentBuilder();
return new DOMSource(dbuilder.parse(entityStream));
} catch (NullPointerException npe) {
// For Sun JDK5, they will never fix this problem. See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6181020
// Let's be as safe as possible, and check that all the conditions that indicate we're avoiding DTD expansion attack
// are present. We'll need the catch the NPE when we do the parse, inspect the stack, and fail gracefully. Ugly
// hack, but it works. (Ideally, we'd also inspect the entityStream to ensure we're definitely doing DTD expansion
// when we get this NPE, but we cannot reliably reset the stream and re-read it due to possibly getting a stream
// that does not support .reset().)
StackTraceElement[] stackTraceElement = npe.getStackTrace();
for(int i = 0; i < stackTraceElement.length; i++) {
if(stackTraceElement[i].getClassName().equals("com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl") //$NON-NLS-1$
&& (stackTraceElement[i].getMethodName().equals("setChunkIndex"))) { //$NON-NLS-1$
// then it's really Sun JDK5, and as far as we can tell, it's related to DTD expansion attack, and we should fail gracefully
logger.error(Messages.getMessage("entityRefsNotSupportedSunJDK5"), npe); //$NON-NLS-1$
throw new WebApplicationException(Response.Status.BAD_REQUEST);
}
}
throw npe;
} catch (SAXException e) {
logger.error(Messages.getMessage("saxParseException", type.getName()), e); //$NON-NLS-1$
throw new WebApplicationException(e, Response.Status.BAD_REQUEST);
} catch (ParserConfigurationException e) {
logger.error(Messages.getMessage("saxParserConfigurationException"), e); //$NON-NLS-1$
throw new WebApplicationException(e, Response.Status.BAD_REQUEST);
}
}
}
protected boolean isReadable(MediaType mediaType) {
return MediaTypeUtils.isXmlType(mediaType);
}
public long getSize(Source t,
Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return -1;
}
public boolean isWriteable(Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return (Source.class.isAssignableFrom(type) && MediaTypeUtils.isXmlType(mediaType));
}
public void writeTo(Source t,
Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap httpHeaders,
OutputStream entityStream) throws IOException, WebApplicationException {
StreamResult sr = new StreamResult(entityStream);
Transformer transformer;
try {
transformer = transformerFactory.newTransformer();
transformer.transform(t, sr);
} catch (TransformerException e) {
throw asIOException(e);
}
}
private static IOException asIOException(Exception e) throws IOException {
IOException exception = new IOException();
exception.initCause(e);
return exception;
}
}
