/*
 * Copyright 2017 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.asitplus.eidas.specific.connector.attributes;

import static at.gv.egiz.eaaf.core.api.data.ExtendedPvpAttributeDefinitions.EID_AUTHBLOCK_SIGNED_FRIENDLY_NAME;
import static at.gv.egiz.eaaf.core.api.data.ExtendedPvpAttributeDefinitions.EID_AUTHBLOCK_SIGNED_NAME;

import java.nio.charset.StandardCharsets;
import java.util.Base64;

import org.apache.commons.lang3.StringUtils;

import at.asitplus.eidas.specific.core.MsEidasNodeConstants;
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;


@PvpMetadata
public class AuthBlockAttributeBuilder implements IPvpAttributeBuilder {

  @Override
  public String getName() {
    return EID_AUTHBLOCK_SIGNED_NAME;
  }

  @Override
  public <ATT> ATT build(final ISpConfiguration oaParam, final IAuthData authData,
                         final IAttributeGenerator<ATT> g) throws AttributeBuilderException {

    String authBlock = authData.getGenericData(MsEidasNodeConstants.AUTH_DATA_SZR_AUTHBLOCK, String.class);
    if (StringUtils.isNotEmpty(authBlock)) {
      return g.buildStringAttribute(EID_AUTHBLOCK_SIGNED_FRIENDLY_NAME, EID_AUTHBLOCK_SIGNED_NAME, 
          Base64.getEncoder().encodeToString(authBlock.getBytes(StandardCharsets.UTF_8)));

    } else {
      throw new UnavailableAttributeException(EID_AUTHBLOCK_SIGNED_NAME);
    }

  }

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

}