org.apache.inlong.sort.filesystem.shaded.com.amazonaws.util.XmlUtils Maven / Gradle / Ivy
/*
* Copyright 2010-2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.amazonaws.util;
import com.amazonaws.internal.SdkThreadLocalsRegistry;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.stream.XMLInputFactory;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLReaderFactory;
public class XmlUtils {
/**
* Shared factory for creating XML event readers
*/
private static final ThreadLocal xmlInputFactory = SdkThreadLocalsRegistry.register(
new ThreadLocal() {
@Override
protected XMLInputFactory initialValue() {
return createXmlInputFactory();
}
});
public static XMLReader parse(InputStream in, ContentHandler handler)
throws SAXException, IOException {
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
reader.setFeature("http://xml.org/sax/features/external-general-entities", false);
reader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
reader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
reader.setContentHandler(handler);
reader.parse(new InputSource(in));
in.close();
return reader;
}
/**
* @return A {@link ThreadLocal} copy of {@link XMLInputFactory}.
*/
public static XMLInputFactory getXmlInputFactory() {
return xmlInputFactory.get();
}
/**
* Disables certain dangerous features that attempt to automatically fetch DTDs
*
* See OWASP XXE Cheat Sheet
*/
private static XMLInputFactory createXmlInputFactory() {
XMLInputFactory factory = XMLInputFactory.newInstance();
factory.setProperty(XMLInputFactory.SUPPORT_DTD, false);
factory.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
return factory;
}
}