/*******************************************************************************
 * Copyright 2019 Graz University of Technology
 * EAAF-Core Components has been developed in a cooperation between EGIZ,  
 * A-SIT Plus, A-SIT, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.2 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:
 * https://joinup.ec.europa.eu/news/understanding-eupl-v12
 *
 * 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.egiz.eaaf.core.impl.idp.builder.attributes;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.IEidAuthData;
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;

@PVPMETADATA
public class EIDSignerCertificate implements IPVPAttributeBuilder {
	private static final Logger log = LoggerFactory.getLogger(EIDSignerCertificate.class);
	
	@Override
	public String getName() {
		return EID_SIGNER_CERTIFICATE_NAME;
	}

	@Override
	public <ATT> ATT build(final ISPConfiguration oaParam, final IAuthData authData,
			final IAttributeGenerator<ATT> g) throws AttributeBuilderException {
		
		if (authData instanceof IEidAuthData) {
			try {
				
				final byte[] signerCertificate = ((IEidAuthData)authData).getSignerCertificate();
				if (signerCertificate != null) {
					return g.buildStringAttribute(EID_SIGNER_CERTIFICATE_FRIENDLY_NAME, EID_SIGNER_CERTIFICATE_NAME, 
						Base64Utils.encodeToString(signerCertificate));
			
				} else
					log.info(EID_SIGNER_CERTIFICATE_FRIENDLY_NAME + " is only available in MOA-ID context");
			
			} catch (final Exception e) {
				log.info("Signer certificate BASE64 encoding error");
			
			}
			
		} else
			log.info(EID_SIGNER_CERTIFICATE_FRIENDLY_NAME + " is only available in AuthHandler context");
			
		
		throw new UnavailableAttributeException(EID_SIGNER_CERTIFICATE_NAME);
		
	}

	@Override
	public <ATT> ATT buildEmpty(final IAttributeGenerator<ATT> g) {
		return g.buildEmptyAttribute(EID_SIGNER_CERTIFICATE_FRIENDLY_NAME, EID_SIGNER_CERTIFICATE_NAME);
	}

}