/*******************************************************************************
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *******************************************************************************/
package at.gv.egovernment.moa.id.protocols.builder.attributes;

import java.io.IOException;

import at.gv.egiz.eaaf.core.api.data.EAAFConstants;
import at.gv.egiz.eaaf.core.api.idp.IAttributeGenerator;
import at.gv.egiz.eaaf.core.api.idp.IAuthData;
import at.gv.egiz.eaaf.core.api.idp.IPVPAttributeBuilder;
import at.gv.egiz.eaaf.core.api.idp.ISPConfiguration;
import at.gv.egiz.eaaf.core.exceptions.AttributeBuilderException;
import at.gv.egiz.eaaf.core.exceptions.UnavailableAttributeException;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.util.Base64Utils;

public class HolderOfKey implements IPVPAttributeBuilder {
	
	public String getName() {
		return PVP_HOLDEROFKEY_NAME;
	}
	
	public <ATT> ATT build(ISPConfiguration oaParam, IAuthData authData,
			IAttributeGenerator<ATT> g) throws AttributeBuilderException {
		
		try {
			byte[] certEncoded = authData.getGenericData(
					EAAFConstants.PROCESS_ENGINE_SSL_CLIENT_CERTIFICATE, 
					byte[].class);
			
			if (certEncoded != null) {
				return g.buildStringAttribute(PVP_HOLDEROFKEY_FRIENDLY_NAME, PVP_HOLDEROFKEY_NAME,
						Base64Utils.encode(certEncoded));
				
			}
			
		}
		catch (IOException e) {
			Logger.info("Encode AuthBlock BASE64 failed.");
		}
		throw new UnavailableAttributeException(PVP_HOLDEROFKEY_NAME);
		
	}
	
	public <ATT> ATT buildEmpty(IAttributeGenerator<ATT> g) {
		return g.buildEmptyAttribute(PVP_HOLDEROFKEY_NAME, PVP_HOLDEROFKEY_NAME);
	}
	
}