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Milton Community Edition: Supports DAV level 1 and is available on Apache2 license
/*
* 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 io.milton.http.webdav;
import io.milton.common.StreamUtils;
import java.io.ByteArrayInputStream;
import org.apache.commons.io.output.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.LinkedHashSet;
import java.util.Set;
import javax.xml.namespace.QName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLReaderFactory;
/**
* Simple implmentation which just parses the request body. If no xml is present
* it will return an empty set.
*
* Note this generally shouldnt be used directly, but should be wrapped by
* MSPropFindRequestFieldParser to support windows clients.
*
* @author brad
*/
public class DefaultPropFindRequestFieldParser implements PropFindRequestFieldParser {
private static final Logger log = LoggerFactory.getLogger( DefaultPropFindRequestFieldParser.class );
public DefaultPropFindRequestFieldParser() {
}
@Override
public PropertiesRequest getRequestedFields( InputStream in ) {
final Set set = new LinkedHashSet<>();
try {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
StreamUtils.readTo( in, bout, false, true );
byte[] arr = bout.toByteArray();
if( arr.length > 1 ) {
ByteArrayInputStream bin = new ByteArrayInputStream( arr );
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
// https://www.owasp.org/index.php/XML_External_Entity_%28XXE%29_Processing
reader.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
reader.setFeature("http://xml.org/sax/features/external-general-entities", false);
PropFindSaxHandler handler = new PropFindSaxHandler();
reader.setContentHandler( handler );
try {
reader.parse( new InputSource( bin ) );
if( handler.isAllProp() ) {
return new PropertiesRequest();
} else {
set.addAll( handler.getAttributes().keySet() );
}
} catch( IOException | SAXException e ) {
log.warn( "exception parsing request body", e );
// ignore
}
}
} catch( Exception ex ) {
// There's a report of an exception being thrown here by IT Hit Webdav client
// Perhaps we can just log the error and return an empty set. Usually this
// class is wrapped by the MsPropFindRequestFieldParser which will use a default
// set of properties if this returns an empty set
log.warn("Exception parsing PROPFIND request fields. Returning empty property set", ex);
//throw new RuntimeException( ex );
}
return PropertiesRequest.toProperties(set);
}
}