/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "<WebSig>" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, Institute for
 * Data Communications Systems, <http://www.nue.et-inf.uni-siegen.de/>.
 * The development of this software was partly funded by the European 
 * Commission in the <WebSig> project in the ISIS Programme. 
 * For more information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

/*
 * XSEC
 *
 * DSIGTransformBase64 := Class that holds a Base64 transform structure
 *
 * Author(s): Berin Lautenbach
 *
 * $Id: DSIGTransformBase64.cpp,v 1.3 2003/02/21 11:53:06 blautenb Exp $
 *
 */

// XSEC

#include <xsec/dsig/DSIGTransformBase64.hpp>
#include <xsec/dsig/DSIGSignature.hpp>
#include <xsec/transformers/TXFMBase64.hpp>
#include <xsec/transformers/TXFMC14n.hpp>
#include <xsec/transformers/TXFMChain.hpp>
#include <xsec/transformers/TXFMXPath.hpp>
#include <xsec/framework/XSECException.hpp>
#include <xsec/utils/XSECDOMUtils.hpp>
#include <xsec/framework/XSECError.hpp>

// --------------------------------------------------------------------------------
//           Constructors and Destructors
// --------------------------------------------------------------------------------

DSIGTransformBase64::DSIGTransformBase64(DSIGSignature *sig, DOMNode * node) :
DSIGTransform(sig, node) {};


DSIGTransformBase64::DSIGTransformBase64(DSIGSignature *sig) :
DSIGTransform(sig) {};
		  

DSIGTransformBase64::~DSIGTransformBase64() {};

// --------------------------------------------------------------------------------
//           Interface Methods
// --------------------------------------------------------------------------------


transformType DSIGTransformBase64::getTransformType() {

	return TRANSFORM_BASE64;

}


void DSIGTransformBase64::appendTransformer(TXFMChain * input) {

	// If the input is a Nodeset then we need to find the text from the input

	if (input->getLastTxfm()->getOutputType() == TXFMBase::DOM_NODES) {


#ifdef XSEC_NO_XPATH

		throw XSECException(XSECException::UnsupportedFunction,
			"Unable to extract Base64 text from Nodes without XPath support");

#else
		
		// Use an XPath transform to get "Self::text()" from the nodeset
		
		TXFMXPath *x;
		
		XSECnew(x, TXFMXPath(mp_txfmNode->getOwnerDocument()));
		input->appendTxfm(x);
		((TXFMXPath *) x)->evaluateExpr(mp_txfmNode, "self::text()");
		
		TXFMC14n *c;
		
		// Now use c14n to translate to BYTES
		
		XSECnew(c, TXFMC14n(mp_txfmNode->getOwnerDocument()));
		input->appendTxfm(c);
#endif

	}

	// Now the actual Base64

	TXFMBase64 *b;
	XSECnew(b, TXFMBase64(mp_txfmNode->getOwnerDocument()));
	input->appendTxfm(b);

}

DOMElement * DSIGTransformBase64::createBlankTransform(DOMDocument * parentDoc) {

	safeBuffer str;
	const XMLCh * prefix;
	DOMElement *ret;
	DOMDocument *doc = mp_parentSignature->getParentDocument();

	prefix = mp_parentSignature->getDSIGNSPrefix();
	
	// Create the transform node
	makeQName(str, prefix, "Transform");
	ret = doc->createElementNS(DSIGConstants::s_unicodeStrURIDSIG, str.rawXMLChBuffer());
	ret->setAttribute(DSIGConstants::s_unicodeStrAlgorithm, DSIGConstants::s_unicodeStrURIBASE64);

	mp_txfmNode = ret;

	return ret;

}

void DSIGTransformBase64::load(void) {

	// Do nothing for a Base64 transform

}