/*
 * 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.eidas.validator;

import at.gv.egiz.eaaf.core.api.IRequest;
import at.gv.egiz.eaaf.core.impl.data.Trible;
import at.gv.egovernment.moa.id.auth.modules.eidas.Constants;
import at.gv.egovernment.moa.id.auth.modules.eidas.utils.SAMLEngineUtils;
import at.gv.egovernment.moa.id.auth.modules.eidas.utils.eIDASAttributeProcessingUtils;
import at.gv.egovernment.moa.id.commons.api.IOAAuthParameters;
import at.gv.egovernment.moa.id.commons.api.exceptions.MOAIDException;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.util.MiscUtil;
import eu.eidas.auth.commons.protocol.IAuthenticationResponse;
import eu.eidas.auth.commons.protocol.eidas.LevelOfAssurance;

/**
 * @author tlenz
 *
 */
public class eIDASResponseValidator {
	

	public static void validateResponse(IRequest pendingReq, IAuthenticationResponse samlResp, String spCountry) throws MOAIDException {		

		/*-----------------------------------------------------|
		 * validate received LoA against minimum required LoA  |
		 *_____________________________________________________|
		 */
		LevelOfAssurance reqLoA = LevelOfAssurance.fromString(pendingReq.getServiceProviderConfiguration(IOAAuthParameters.class).getQaaLevel());
		LevelOfAssurance respLoA = LevelOfAssurance.fromString(samlResp.getLevelOfAssurance()); 
		if (respLoA.numericValue() < reqLoA.numericValue()) {
			Logger.error("eIDAS Response LevelOfAssurance is lower than the required! "
					+ "(Resp-LoA:" + respLoA.getValue() + " Req-LoA:" + reqLoA.getValue() + ")");
			throw new MOAIDException("eIDAS.14", new Object[]{respLoA.getValue()});
			
		}

		/*-----------------------------------------------------|
		 *     validate 'PersonalIdentifier' attribute         |
		 *_____________________________________________________|
		 */
		String respCC = samlResp.getCountry();		
		Object personalIdObj = samlResp.getAttributes().getFirstValue(
	        		SAMLEngineUtils.getMapOfAllAvailableAttributes().get(
	        				Constants.eIDAS_ATTR_PERSONALIDENTIFIER));
	   
		//check attribute type
		if (personalIdObj == null || !(personalIdObj instanceof String))
	        	Logger.warn("eIDAS Response include NO 'PersonalIdentifier' attriubte "
	        			+ ".... That can be a BIG problem in further processing steps");	
		
		else {
			//validate attribute value format
			Trible<String, String, String> split = 
					eIDASAttributeProcessingUtils.parseEidasPersonalIdentifier((String)personalIdObj);
			if (split == null) {
				throw new MOAIDException("eIDAS.16", 
						new Object[]{
								Constants.eIDAS_ATTR_PERSONALIDENTIFIER,
								"Wrong identifier format"});
				
			} else {
				//validation according to eIDAS SAML Attribute Profile, Section 2.2.3 
				if (MiscUtil.isEmpty(split.getSecond())) {
					Logger.error("eIDAS attribute value for " + Constants.eIDAS_ATTR_PERSONALIDENTIFIER 
							+ " includes NO destination country. Value:" + ((String)personalIdObj));				
					throw new MOAIDException("eIDAS.16", 
							new Object[]{
									Constants.eIDAS_ATTR_PERSONALIDENTIFIER,
									"No or empty destination country"});
					
				}
				if (!split.getSecond().equalsIgnoreCase(spCountry)) {
					Logger.error("eIDAS attribute value for " + Constants.eIDAS_ATTR_PERSONALIDENTIFIER 
							+ " includes wrong destination country. Value:" + ((String)personalIdObj)
							+ " SP-Country:" + spCountry);				
					throw new MOAIDException("eIDAS.16", 
							new Object[]{
									Constants.eIDAS_ATTR_PERSONALIDENTIFIER,
									"Destination country does not match to SP country"});
					
				}
				
				if (MiscUtil.isEmpty(split.getFirst())) {
					Logger.error("eIDAS attribute value for " + Constants.eIDAS_ATTR_PERSONALIDENTIFIER 
							+ " includes NO citizen country. Value:" + ((String)personalIdObj));				
					throw new MOAIDException("eIDAS.16", 
							new Object[]{
									Constants.eIDAS_ATTR_PERSONALIDENTIFIER,
									"No or empty citizen country"});
					
				}
				if (!split.getFirst().equalsIgnoreCase(respCC)) {
					Logger.error("eIDAS attribute value for " + Constants.eIDAS_ATTR_PERSONALIDENTIFIER 
							+ " includes a citizen country that does not match to eIDAS Response node. "
							+ " Value:" + ((String)personalIdObj)
							+ " Response-Node Country:" + respCC);				
					throw new MOAIDException("eIDAS.16", 
							new Object[]{
									Constants.eIDAS_ATTR_PERSONALIDENTIFIER,
									"Citizen country does not match to eIDAS-node country that generates the response"});
					
				}				
			}									
		}
		
		
		
	}
}