/*
 * 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.auth.modules.eidas.utils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import at.gv.egiz.eaaf.core.impl.data.Trible;
import at.gv.egovernment.moa.id.auth.modules.eidas.Constants;
import at.gv.egovernment.moa.logging.Logger;

/**
 * @author tlenz
 *
 */
public class eIDASAttributeProcessingUtils {
	public static final String PERSONALIDENIFIER_VALIDATION_PATTERN = "^[A-Z,a-z]{2}/[A-Z,a-z]{2}/.*";
	
	/**
	 * Validate a eIDAS PersonalIdentifier attribute value 
	 * This validation is done according to eIDAS SAML Attribute Profile -  Section 2.2.3 Unique Identifier 
	 * 
	 * @param uniqueID eIDAS attribute value of a unique identifier
	 * @return true if the uniqueID matches to eIDAS to Unique Identifier specification, otherwise false
	 */
	public static boolean validateEidasPersonalIdentifier(String uniqueID) {
		Pattern pattern = Pattern.compile(PERSONALIDENIFIER_VALIDATION_PATTERN );
		Matcher matcher = pattern.matcher(uniqueID);	
		return matcher.matches();
		
	}
	
	
	/**
	 * Parse an eIDAS PersonalIdentifier attribute value into it components. 
	 * This processing is done according to eIDAS SAML Attribute Profile -  Section 2.2.3 Unique Identifier 
	 * 
	 * @param uniqueID eIDAS attribute value of a unique identifier
	 * @return {@link Trible} that contains: 
	 * 				<br> First : citizen country
	 * 				<br> Second: destination country
	 * 				<br> Third : unique identifier
	 * 	<br> or null if the attribute value has a wrong format
	 */					
	public static Trible<String, String, String> parseEidasPersonalIdentifier(String uniqueID) {
		if (!validateEidasPersonalIdentifier(uniqueID)) {
			Logger.error("eIDAS attribute value for " + Constants.eIDAS_ATTR_PERSONALIDENTIFIER 
					+ " looks wrong formated. Value:" + ((String)uniqueID));				
			return null;
			
		}		
		return Trible.newInstance(uniqueID.substring(0, 2), uniqueID.substring(3, 5), uniqueID.substring(6)); 
		
	}
}