/**
* Copyright (C) 2010 Orbeon, Inc.
*
* 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
* 2.1 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.
*
* The full text of the license is available at http://www.gnu.org/copyleft/lesser.html
*/
package org.orbeon.oxf.xforms.function;
import org.orbeon.oxf.util.SecureUtils;
import org.orbeon.saxon.expr.Expression;
import org.orbeon.saxon.expr.XPathContext;
import org.orbeon.saxon.om.Item;
import org.orbeon.saxon.trans.XPathException;
import org.orbeon.saxon.value.StringValue;
/**
* XForms digest() function (XForms 1.1).
*/
public class Digest extends XFormsFunction {
public Item evaluateItem(XPathContext xpathContext) throws XPathException {
final Expression dataExpression = argument[0];
final Expression algorithmExpression = argument[1];
final Expression encodingExpression = argument.length == 3 ? argument[2] : null;
final String data = dataExpression.evaluateAsString(xpathContext).toString();
final String algorithm = algorithmExpression.evaluateAsString(xpathContext).toString();
final String encoding = encodingExpression != null ? encodingExpression.evaluateAsString(xpathContext).toString() : "base64";
// Create digest
final String result = SecureUtils.digestString(data, algorithm, encoding);
return new StringValue(result);
}
}