/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-09 Wolfgang M. Meier
* wolfgang@exist-db.org
* http://exist.sourceforge.net
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package org.exist.xquery.functions.request;
import org.apache.log4j.Logger;
import org.exist.external.org.apache.commons.io.output.ByteArrayOutputStream;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import org.exist.dom.QName;
import org.exist.http.servlets.RequestWrapper;
import org.exist.xquery.BasicFunction;
import org.exist.xquery.Cardinality;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.Variable;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.Base64Binary;
import org.exist.xquery.value.FunctionParameterSequenceType;
import org.exist.xquery.value.FunctionReturnSequenceType;
import org.exist.xquery.value.JavaObjectValue;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.Type;
/**
* @author wolf
*/
public class GetUploadedFile extends BasicFunction {
protected static final Logger logger = Logger.getLogger(GetUploadedFile.class);
public final static FunctionSignature signatures[] = {
new FunctionSignature(
new QName("get-uploaded-file", RequestModule.NAMESPACE_URI, RequestModule.PREFIX),
"Retrieve the Java file object where the file part of a multi-part request has been stored. " +
"Returns the empty sequence if the request is not a multi-part request or the parameter name " +
"does not point to a file part.",
new SequenceType[] {
new FunctionParameterSequenceType("upload-param-name", Type.STRING, Cardinality.EXACTLY_ONE, "The parameter name")
},
new SequenceType(Type.ITEM, Cardinality.ZERO_OR_ONE),
"Deprecated in favour of get-uploaded-file-data()"
),
new FunctionSignature(
new QName("get-uploaded-file-data", RequestModule.NAMESPACE_URI, RequestModule.PREFIX),
"Retrieve the base64 encoded data where the file part of a multi-part request has been stored. " +
"Returns the empty sequence if the request is not a multi-part request or the parameter name " +
"does not point to a file part.",
new SequenceType[] {
new FunctionParameterSequenceType("upload-param-name", Type.STRING, Cardinality.EXACTLY_ONE, "The parameter name")
},
new FunctionReturnSequenceType(Type.BASE64_BINARY, Cardinality.ZERO_OR_ONE, "the base64 encoded data from the uploaded file")
)
};
public GetUploadedFile(XQueryContext context, FunctionSignature signature) {
super(context, signature);
}
/* (non-Javadoc)
* @see org.exist.xquery.BasicFunction#eval(org.exist.xquery.value.Sequence[], org.exist.xquery.value.Sequence)
*/
public Sequence eval(Sequence[] args, Sequence contextSequence)
throws XPathException {
RequestModule myModule =
(RequestModule) context.getModule(RequestModule.NAMESPACE_URI);
// request object is read from global variable $request
Variable var = myModule.resolveVariable(RequestModule.REQUEST_VAR);
if(var == null || var.getValue() == null)
throw new XPathException(this, "No request object found in the current XQuery context.");
if (var.getValue().getItemType() != Type.JAVA_OBJECT)
throw new XPathException(this, "Variable $request is not bound to an Java object.");
// get parameters
String uploadParamName = args[0].getStringValue();
JavaObjectValue value = (JavaObjectValue) var.getValue().itemAt(0);
if (value.getObject() instanceof RequestWrapper) {
RequestWrapper request = (RequestWrapper)value.getObject();
File file = request.getFileUploadParam(uploadParamName);
if(file == null) {
logger.debug("File param not found: " + uploadParamName);
return Sequence.EMPTY_SEQUENCE;
} else
logger.debug("Uploaded file: " + file.getAbsolutePath());
if(isCalledAs("get-uploaded-file-data"))
{
InputStream is = null;
try
{
is = new BufferedInputStream(new FileInputStream(file));
byte buf[] = new byte[1024];
int read = -1;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while((read = is.read(buf)) != -1)
{
baos.write(buf, 0, read);
}
return new Base64Binary(baos.toByteArray());
}
catch(FileNotFoundException fnfe)
{
throw new XPathException(this, fnfe.getMessage(), fnfe);
}
catch (IOException ioe)
{
throw new XPathException(this, ioe.getMessage(), ioe);
}
finally
{
if(is != null)
{
try
{
is.close();
}
catch (IOException ioe)
{
logger.warn(ioe.getMessage(), ioe);
}
}
}
}
else
{
return new JavaObjectValue(file);
}
}
else
{
throw new XPathException(this, "Variable $request is not bound to a Request object.");
}
}
}