/*******************************************************************************
 * 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.pvp2x.builder.attributes;

import java.io.IOException;

import javax.xml.transform.TransformerException;

import org.w3c.dom.Element;

import at.gv.egovernment.moa.id.auth.data.AuthenticationSession;
import at.gv.egovernment.moa.id.auth.exception.MOAIDException;
import at.gv.egovernment.moa.id.config.auth.OAAuthParameter;
import at.gv.egovernment.moa.id.data.AuthenticationData;
import at.gv.egovernment.moa.id.protocols.pvp2x.builder.attributes.exceptions.AttributeException;
import at.gv.egovernment.moa.id.util.IdentityLinkReSigner;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.util.Base64Utils;
import at.gv.egovernment.moa.util.DOMUtils;

public class EIDIdentityLinkBuilder implements IPVPAttributeBuilder {

	public String getName() {
		return EID_IDENTITY_LINK_NAME;
	}

	public <ATT> ATT build(AuthenticationSession authSession, OAAuthParameter oaParam, AuthenticationData authData,
			IAttributeGenerator<ATT> g) throws AttributeException {
		try {
			String ilAssertion = null;
			if (oaParam.getBusinessService()) {
			
				IdentityLinkReSigner identitylinkresigner = IdentityLinkReSigner.getInstance();
						
				Element resignedilAssertion;

				resignedilAssertion = identitylinkresigner.resignIdentityLink(authData.getIdentityLink()
							.getSamlAssertion());
				
				ilAssertion = DOMUtils.serializeNode(resignedilAssertion);
				
			} else
				ilAssertion = authData.getIdentityLink().getSerializedSamlAssertion();
		
		
			return g.buildStringAttribute(EID_IDENTITY_LINK_FRIENDLY_NAME,
					EID_IDENTITY_LINK_NAME, Base64Utils.encode(ilAssertion.getBytes()));
			
		} catch (MOAIDException e) {
			Logger.warn("IdentityLink serialization error.", e);
			return g.buildEmptyAttribute(EID_IDENTITY_LINK_FRIENDLY_NAME,
					EID_IDENTITY_LINK_NAME);
		} catch (TransformerException e) {
			Logger.warn("IdentityLink serialization error.", e);
			return g.buildEmptyAttribute(EID_IDENTITY_LINK_FRIENDLY_NAME,
					EID_IDENTITY_LINK_NAME);
		} catch (IOException e) {
			Logger.warn("IdentityLink serialization error.", e);
			return g.buildEmptyAttribute(EID_IDENTITY_LINK_FRIENDLY_NAME,
					EID_IDENTITY_LINK_NAME);
		}
		
	}

	public <ATT> ATT buildEmpty(IAttributeGenerator<ATT> g) {
		return g.buildEmptyAttribute(EID_IDENTITY_LINK_FRIENDLY_NAME,
				EID_IDENTITY_LINK_NAME);
	}

}