nifi-registry-core/nifi-registry-framework/src/main/java/org/apache/nifi/registry/security/util/XmlUtils.java

/*
 * 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.nifi.registry.security.util;

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.stream.StreamSource;
import java.io.InputStream;

public class XmlUtils {

    public static XMLStreamReader createSafeReader(InputStream inputStream) throws XMLStreamException {
        if (inputStream == null) {
            throw new IllegalArgumentException("The provided input stream cannot be null");
        }
        return createSafeReader(new StreamSource(inputStream));
    }

    public static XMLStreamReader createSafeReader(StreamSource source) throws XMLStreamException {
        if (source == null) {
            throw new IllegalArgumentException("The provided source cannot be null");
        }

        XMLInputFactory xif = XMLInputFactory.newFactory();
        xif.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
        xif.setProperty(XMLInputFactory.SUPPORT_DTD, false);
        return xif.createXMLStreamReader(source);
    }
}