/*
 * 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;


import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.joda.time.DateTime;
import org.opensaml.saml2.core.Assertion;
import org.opensaml.saml2.core.Attribute;
import org.opensaml.saml2.core.AttributeQuery;
import org.opensaml.saml2.core.Response;
import org.opensaml.ws.message.encoder.MessageEncodingException;
import org.opensaml.xml.security.SecurityException;

import java.util.Arrays;

import at.gv.egovernment.moa.id.auth.builder.AuthenticationDataBuilder;
import at.gv.egovernment.moa.id.auth.data.AuthenticationSession;
import at.gv.egovernment.moa.id.auth.exception.MOAIDException;
import at.gv.egovernment.moa.id.data.IAuthData;
import at.gv.egovernment.moa.id.data.SLOInformationInterface;
import at.gv.egovernment.moa.id.moduls.IAction;
import at.gv.egovernment.moa.id.moduls.IRequest;
import at.gv.egovernment.moa.id.protocols.pvp2x.binding.SoapBinding;
import at.gv.egovernment.moa.id.protocols.pvp2x.builder.AuthResponseBuilder;
import at.gv.egovernment.moa.id.protocols.pvp2x.builder.assertion.PVP2AssertionBuilder;
import at.gv.egovernment.moa.id.protocols.pvp2x.exceptions.AttributQueryException;
import at.gv.egovernment.moa.id.protocols.pvp2x.messages.MOARequest;
import at.gv.egovernment.moa.id.storage.AuthenticationSessionStoreage;
import at.gv.egovernment.moa.logging.Logger;

/**
 * @author tlenz
 *
 */
public class AttributQueryAction implements IAction {

	private final static List<String> DEFAULTSTORKATTRIBUTES = Arrays.asList(
			new String[]{PVPConstants.EID_STORK_TOKEN_NAME});	
	
	private final static List<String> DEFAULTMANDATEATTRIBUTES = Arrays.asList(
			new String[]{	PVPConstants.MANDATE_FULL_MANDATE_NAME, 
							PVPConstants.MANDATE_PROF_REP_OID_NAME});
	

	
	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.moduls.IAction#processRequest(at.gv.egovernment.moa.id.moduls.IRequest, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, at.gv.egovernment.moa.id.data.IAuthData)
	 */
	@Override
	public SLOInformationInterface processRequest(IRequest req,
			HttpServletRequest httpReq, HttpServletResponse httpResp,
			IAuthData authData) throws MOAIDException {
		
		if (req instanceof PVPTargetConfiguration && 
				((PVPTargetConfiguration) req).getRequest() instanceof MOARequest && 
				((MOARequest)((PVPTargetConfiguration) req).getRequest()).getSamlRequest() instanceof AttributeQuery) {
			
			AttributeQuery attrQuery = (AttributeQuery)((MOARequest)((PVPTargetConfiguration) req).getRequest()).getSamlRequest();			
			
			//load moaSession
			String nameID = attrQuery.getSubject().getNameID().getValue();
			
			AuthenticationSession session = AuthenticationSessionStoreage.getSessionWithUserNameID(nameID);
			if (session == null) {
				Logger.warn("AttributeQuery nameID does not match to an active single sign-on session.");
				throw new AttributQueryException("AttributeQuery nameID does not match to an active single sign-on session.", null);
				
			}

			DateTime date = new DateTime();
			
			//generate authData
			authData = AuthenticationDataBuilder.buildAuthenticationData(req, session, attrQuery.getAttributes());

			//add default attributes in case of mandates or STORK is in use
			List<String> attrList = addDefaultAttributes(attrQuery, authData);			

			//build PVP 2.1 assertion
			Assertion assertion = PVP2AssertionBuilder.buildAssertion(req.getAuthURL(), attrQuery, attrList, authData, date, authData.getSessionIndex());
			
			//build PVP 2.1 response
			Response authResponse = AuthResponseBuilder.buildResponse(req.getAuthURL(), attrQuery, date, assertion);
						
			try {
				SoapBinding decoder = new SoapBinding();				
				decoder.encodeRespone(httpReq, httpResp, authResponse, null, null);
				return null;
				
			} catch (MessageEncodingException e) {
				Logger.error("Message Encoding exception", e);
				throw new MOAIDException("pvp2.01", null, e);
				
			} catch (SecurityException e) {
				Logger.error("Security exception", e);
				throw new MOAIDException("pvp2.01", null, e);

			}
			
		} else {
			Logger.error("Process AttributeQueryAction but request is NOT of type AttributQuery.");
			throw new MOAIDException("pvp2.13", null);
			
		}
	}

	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.moduls.IAction#needAuthentication(at.gv.egovernment.moa.id.moduls.IRequest, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
	 */
	@Override
	public boolean needAuthentication(IRequest req, HttpServletRequest httpReq,
			HttpServletResponse httpResp) {
		return false;
	}

	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.moduls.IAction#getDefaultActionName()
	 */
	@Override
	public String getDefaultActionName() {
		return PVP2XProtocol.ATTRIBUTEQUERY;
	}

	private List<String> addDefaultAttributes(AttributeQuery query, IAuthData authData) {
		
		List<String> reqAttributs = new ArrayList<String>();
		
		for (Attribute attr : query.getAttributes()) {
			reqAttributs.add(attr.getName());
						
		}
		
		//add default STORK attributes if it is a STORK authentication
		if (authData.isForeigner() && !reqAttributs.containsAll(DEFAULTSTORKATTRIBUTES)) {
			for (String el : DEFAULTSTORKATTRIBUTES) {
				if (!reqAttributs.contains(el))
					reqAttributs.add(el);
			}
		}
		
		//add default mandate attributes if it is a authentication with mandates
		if (authData.isUseMandate() && !reqAttributs.containsAll(DEFAULTMANDATEATTRIBUTES)) {
			for (String el : DEFAULTMANDATEATTRIBUTES) {
				if (!reqAttributs.contains(el))
					reqAttributs.add(el);
			}
		}

		return reqAttributs;
	}
}