PseudonymSerializerXml.java

//* Licensed Materials - Property of                                  *
//* IBM                                                               *
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//* eu.abc4trust.pabce.1.34                                           *
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//*   http://www.apache.org/licenses/LICENSE-2.0                      *
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package eu.abc4trust.cryptoEngine.user;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.net.URI;

import eu.abc4trust.smartcard.CardStorage;
import eu.abc4trust.xml.ObjectFactory;
import eu.abc4trust.xml.PseudonymWithMetadata;
import eu.abc4trust.xml.util.XmlUtils;

/**
 * This class serializes pseudonym by their XML value.
 * 
 * @author enr
 */
public class PseudonymSerializerXml extends AbstractPseudonymSerializer {

	private final CardStorage cardStorage;
	
	public PseudonymSerializerXml(CardStorage cardStorage){
		this.cardStorage = cardStorage;
	}
	
	@Override
	public CardStorage getCardStorage(){
		return this.cardStorage;
	}
	
  @Override
  public byte[] serializePseudonym(PseudonymWithMetadata pwm) {
	  if(pwm.getPseudonym().isExclusive()){
		  return this.serializeExclusivePseudonym(pwm);
	  }
	  
    try {
      ByteArrayOutputStream ser = new ByteArrayOutputStream();
      ser.write(magicHeader());

      ObjectFactory of = new ObjectFactory();
      ByteArrayOutputStream xml = XmlUtils.toXmlAsBaos(of.createPseudonymWithMetadata(pwm), true);
      ser.write(xml.toByteArray());

      return ser.toByteArray();
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

  @Override
  public PseudonymWithMetadata unserializePseudonym(byte[] data, URI pseudonymUID) {
    PseudonymWithMetadata pwm;
    int magicHeader = data[0];

    if (magicHeader == this.magicHeaderForScopeExclusive()) {
      return this.unserializeExclusivePseudonym(data, pseudonymUID);
    }
	  
    try {
      ByteArrayInputStream bais = new ByteArrayInputStream(data);
      int header = bais.read();
      if (header != magicHeader()) {
        throw new RuntimeException("Cannot unserialize this pseudonym: header was " + header
            + " expected header " + magicHeader());
      }
      return (PseudonymWithMetadata) XmlUtils.getObjectFromXML(bais, true);
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

  @Override
  public int magicHeader() {
    return 65;
  }

}