/*
 * 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.builder;

import java.util.List;

import org.opensaml.saml2.core.Attribute;

import at.gv.egovernment.moa.id.auth.exception.DynamicOABuildException;
import at.gv.egovernment.moa.id.commons.db.dao.session.InterfederationSessionStore;
import at.gv.egovernment.moa.id.config.ConfigurationException;
import at.gv.egovernment.moa.id.config.auth.AuthConfigurationProvider;
import at.gv.egovernment.moa.id.config.auth.IOAAuthParameters;
import at.gv.egovernment.moa.id.config.auth.OAAuthParameter;
import at.gv.egovernment.moa.id.config.auth.data.DynamicOAAuthParameters;
import at.gv.egovernment.moa.id.moduls.IRequest;
import at.gv.egovernment.moa.id.protocols.pvp2x.PVPConstants;
import at.gv.egovernment.moa.id.protocols.stork2.MOASTORKRequest;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.util.Constants;

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

	public static IOAAuthParameters buildFromAttributeQuery(List<Attribute> reqAttributes, InterfederationSessionStore interfIDP) throws DynamicOABuildException {

		Logger.debug("Build dynamic OAConfiguration from AttributeQuery and interfederation information");
		
		try {
			DynamicOAAuthParameters dynamicOA = new DynamicOAAuthParameters();
					
			for (Attribute attr : reqAttributes) {				
				//get Target or BusinessService from request 
				if (attr.getName().equals(PVPConstants.EID_SECTOR_FOR_IDENTIFIER_NAME)) {
					String attrValue = attr.getAttributeValues().get(0).getDOM().getTextContent();
					if (attrValue.startsWith(Constants.URN_PREFIX_CDID)) {
						dynamicOA.setBusinessService(false);
						dynamicOA.setTarget(attrValue.substring((Constants.URN_PREFIX_CDID + "+").length()));
						
					} else if( attrValue.startsWith(Constants.URN_PREFIX_WBPK) || 
							attrValue.startsWith(Constants.URN_PREFIX_STORK) ) {
						dynamicOA.setBusinessService(true);
						dynamicOA.setTarget(attrValue);
						 					
					} else {
						Logger.error("Sector identification " + attrValue + " is not a valid Target or BusinessServiceArea");
						throw new DynamicOABuildException("Sector identification " + attrValue + " is not a valid Target or BusinessServiceArea", null);
						
					}
					
				}
				
			}
			
			if (interfIDP != null) {
				//load interfederated IDP informations
				OAAuthParameter idp = AuthConfigurationProvider.getInstance().getOnlineApplicationParameter(interfIDP.getIdpurlprefix());
				if (idp == null) {
					Logger.warn("Interfederated IDP configuration is not loadable.");
					throw new DynamicOABuildException("Interfederated IDP configuration is not loadable.", null);
					
				}
			
				dynamicOA.setApplicationID(idp.getPublicURLPrefix());
				dynamicOA.setInderfederatedIDP(idp.isInderfederationIDP());
				dynamicOA.setIDPQueryURL(idp.getIDPAttributQueryServiceURL());
				
				//check if IDP service area policy. BusinessService IDPs can only request wbPKs 
				if (!dynamicOA.getBusinessService() && !idp.isIDPPublicService()) {
					Logger.error("Interfederated IDP " + idp.getPublicURLPrefix() 
							+ " has a BusinessService-IDP but requests PublicService attributes.");
					throw new DynamicOABuildException("Interfederated IDP " + idp.getPublicURLPrefix() 
							+ " has a BusinessService-IDP but requests PublicService attributes.", null);
					
				}				
			}
			
			return dynamicOA;

		} catch (ConfigurationException e) {
			Logger.warn("Internel server errror. Basic configuration load failed.", e);
			throw new DynamicOABuildException("Basic configuration load failed.", null);
		}

		
		
	}

	/**
	 * @param oaParam
	 * @param protocolRequest
	 * @return
	 */
	public static IOAAuthParameters buildFromAuthnRequest(
			IOAAuthParameters oaParam, IRequest protocolRequest) {
		
		DynamicOAAuthParameters dynOAParams = new DynamicOAAuthParameters();
		dynOAParams.setApplicationID(oaParam.getPublicURLPrefix());
		dynOAParams.setBusinessService(oaParam.getBusinessService());
		
		if (protocolRequest instanceof MOASTORKRequest)
			return buildFromSTORKRequest(dynOAParams, (MOASTORKRequest) protocolRequest);
		
		Logger.warn("Dynamic OA generation failed. RequestType is not implemented.");
		return null;
	}

	/**
	 * @param oaParam
	 * @param protocolRequest
	 * @return
	 */
	private static IOAAuthParameters buildFromSTORKRequest(
			DynamicOAAuthParameters oaParam, MOASTORKRequest protocolRequest) {		

		oaParam.setBusinessTarget(Constants.URN_PREFIX_STORK + "+" + "AT" + "+" + protocolRequest.getSpCountry());
		oaParam.setBusinessService(true);
		
		return oaParam;
	}
}