/*******************************************************************************
 * 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 org.springframework.util.Base64Utils;

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.egiz.eaaf.core.impl.idp.builder.attributes.PVPMETADATA;
import at.gv.egovernment.moa.id.data.IMOAAuthData;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.util.MiscUtil;

@PVPMETADATA
public class EIDAuthBlock implements IPVPAttributeBuilder {
	
	public String getName() {
		return EID_AUTH_BLOCK_NAME;
	}
	
	public <ATT> ATT build(ISPConfiguration oaParam, IAuthData authData,
			IAttributeGenerator<ATT> g) throws AttributeBuilderException {
		
		try {
			if (authData instanceof IMOAAuthData) {
				String authblock = ((IMOAAuthData)authData).getAuthBlock();
				if (MiscUtil.isNotEmpty(authblock)) {
					return g.buildStringAttribute(EID_AUTH_BLOCK_FRIENDLY_NAME, EID_AUTH_BLOCK_NAME,
							Base64Utils.encodeToString(authblock.getBytes("UTF-8")));
				}
				
			} else
				Logger.info(EID_AUTH_BLOCK_FRIENDLY_NAME + " is only available in MOA-ID context");
			
		}
		catch (IOException e) {
			Logger.info("Encode AuthBlock BASE64 failed.");
		}
		throw new UnavailableAttributeException(EID_AUTH_BLOCK_NAME);
		
	}
	
	public <ATT> ATT buildEmpty(IAttributeGenerator<ATT> g) {
		return g.buildEmptyAttribute(EID_AUTH_BLOCK_FRIENDLY_NAME, EID_AUTH_BLOCK_NAME);
	}
	
}