/*
* Copyright (c) 2007 Adobe Systems Incorporated
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
package com.adobe.epubcheck.ocf;
import com.adobe.epubcheck.util.HandlerUtil;
import com.adobe.epubcheck.xml.XMLElement;
import com.adobe.epubcheck.xml.XMLHandler;
import com.adobe.epubcheck.xml.XMLParser;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
public class EncryptionHandler implements XMLHandler
{
private final OCFPackage ocf;
private final XMLParser parser;
private boolean checkedUnsupportedXmlVersion = false;
EncryptionHandler(OCFPackage ocf, XMLParser parser)
{
this.ocf = ocf;
this.parser = parser;
}
public void startElement()
{
if (!checkedUnsupportedXmlVersion)
{
HandlerUtil.checkXMLVersion(parser);
checkedUnsupportedXmlVersion = true;
}
// if the element is <CipherReference>, then the element name
// is stripped of rootBase, and URLDecoded, and finally put into
// encryptedItemsSet.
XMLElement e = parser.getCurrentElement();
if (e.getName().equals("CipherReference"))
{
String algorithm = null;
XMLElement parent = e.getParent();
if (parent != null)
{
parent = parent.getParent();
if (parent != null && parent.getName().equals("EncryptedData"))
{
algorithm = (String) parent.getPrivateData();
}
}
String entryName = e.getAttribute("URI");
try
{
entryName = URLDecoder.decode(entryName, "UTF-8");
}
catch (UnsupportedEncodingException er)
{
// UTF-8 is guaranteed to be supported
throw new InternalError(e.toString());
}
if (algorithm == null)
{
algorithm = "unknown";
}
if (algorithm.equals("http://www.idpf.org/2008/embedding"))
{
ocf.setEncryption(entryName, new IDPFFontManglingFilter(null));
}
else if (algorithm.equals("http://ns.adobe.com/pdf/enc#RC"))
{
ocf.setEncryption(entryName, new AdobeFontManglingFilter(null));
}
else
{
ocf.setEncryption(entryName, new UnsupportedEncryptionFilter());
}
}
else if (e.getName().equals("EncryptionMethod"))
{
String algorithm = e.getAttribute("Algorithm");
if (algorithm != null)
{
XMLElement parent = e.getParent();
if (parent != null)
{
String comp = parent.getAttributeNS(
"http://ns.adobe.com/digitaleditions/enc",
"compression");
if (comp == null)
{
parent.setPrivateData(algorithm);
}
}
}
}
}
public void endElement()
{
}
public void ignorableWhitespace(char[] chars, int arg1, int arg2)
{
}
public void characters(char[] chars, int arg1, int arg2)
{
}
public void processingInstruction(String arg0, String arg1)
{
}
}