/*******************************************************************************
 * 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.binding;

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

import org.apache.velocity.app.VelocityEngine;
import org.opensaml.common.SAMLObject;
import org.opensaml.common.binding.BasicSAMLMessageContext;
import org.opensaml.common.xml.SAMLConstants;
import org.opensaml.saml2.binding.decoding.HTTPPostDecoder;
import org.opensaml.saml2.binding.encoding.HTTPPostEncoder;
import org.opensaml.saml2.core.RequestAbstractType;
import org.opensaml.saml2.core.Response;
import org.opensaml.saml2.core.StatusResponseType;
import org.opensaml.saml2.metadata.SPSSODescriptor;
import org.opensaml.saml2.metadata.SingleSignOnService;
import org.opensaml.saml2.metadata.impl.SingleSignOnServiceBuilder;
import org.opensaml.ws.message.decoder.MessageDecodingException;
import org.opensaml.ws.message.encoder.MessageEncodingException;
import org.opensaml.ws.transport.http.HttpServletRequestAdapter;
import org.opensaml.ws.transport.http.HttpServletResponseAdapter;
import org.opensaml.xml.parse.BasicParserPool;
import org.opensaml.xml.security.SecurityException;
import org.opensaml.xml.security.credential.Credential;
import org.opensaml.xml.security.x509.KeyStoreX509CredentialAdapter;
import org.opensaml.xml.security.x509.X509Credential;

import at.gv.egovernment.moa.id.protocols.pvp2x.metadata.MOAMetadataProvider;
import at.gv.egovernment.moa.id.protocols.pvp2x.signer.CredentialProvider;
import at.gv.egovernment.moa.id.protocols.pvp2x.signer.CredentialsNotAvailableException;
import at.gv.egovernment.moa.id.util.VelocityProvider;
import at.gv.egovernment.moa.logging.Logger;

public class PostBinding implements IDecoder, IEncoder {

	public void encodeRequest(HttpServletRequest req, HttpServletResponse resp,
			RequestAbstractType request, String targetLocation)
			throws MessageEncodingException, SecurityException {
		// TODO Auto-generated method stub

	}

	public void encodeRespone(HttpServletRequest req, HttpServletResponse resp,
			StatusResponseType response, String targetLocation, String relayState)
			throws MessageEncodingException, SecurityException {

		try {
			X509Credential credentials = CredentialProvider
					.getIDPAssertionSigningCredential();

			Logger.debug("create SAML POSTBinding response");
			
			 VelocityEngine engine = VelocityProvider.getClassPathVelocityEngine();

			HTTPPostEncoder encoder = new HTTPPostEncoder(engine,
					"resources/templates/pvp_postbinding_template.html");
			HttpServletResponseAdapter responseAdapter = new HttpServletResponseAdapter(
					resp, true);
			BasicSAMLMessageContext<SAMLObject, SAMLObject, SAMLObject> context = new BasicSAMLMessageContext<SAMLObject, SAMLObject, SAMLObject>();
			SingleSignOnService service = new SingleSignOnServiceBuilder()
					.buildObject();
			service.setBinding(SAMLConstants.SAML2_POST_BINDING_URI);
			service.setLocation(targetLocation);
			context.setOutboundSAMLMessageSigningCredential(credentials);			
			context.setPeerEntityEndpoint(service);
			// context.setOutboundMessage(authReq);
			context.setOutboundSAMLMessage(response);
			context.setOutboundMessageTransport(responseAdapter);
			context.setRelayState(relayState);

			encoder.encode(context);
		} catch (CredentialsNotAvailableException e) {
			e.printStackTrace();
			throw new SecurityException(e);
		} catch (Exception e) {
			e.printStackTrace();
			throw new SecurityException(e);
		}
	}

	public MOARequest decodeRequest(HttpServletRequest req,
			HttpServletResponse resp) throws MessageDecodingException,
			SecurityException {

		HTTPPostDecoder decode = new HTTPPostDecoder(new BasicParserPool());
		BasicSAMLMessageContext<RequestAbstractType, ?, ?> messageContext = new BasicSAMLMessageContext<RequestAbstractType, SAMLObject, SAMLObject>();
		messageContext
				.setInboundMessageTransport(new HttpServletRequestAdapter(req));
		decode.setURIComparator(new MOAURICompare());
		messageContext.setPeerEntityRole(SPSSODescriptor.DEFAULT_ELEMENT_NAME);

		messageContext.setMetadataProvider(MOAMetadataProvider.getInstance());

		decode.decode(messageContext);

		RequestAbstractType inboundMessage = (RequestAbstractType) messageContext
				.getInboundMessage();
		

		
		MOARequest request = new MOARequest(inboundMessage);
		request.setVerified(false);
		
		if (messageContext.getPeerEntityMetadata() != null)
			request.setEntityID(messageContext.getPeerEntityMetadata().getEntityID());
		
		else
			Logger.info("No Metadata found for OA with EntityID " + inboundMessage.getIssuer().getValue());
				
		request.setRelayState(messageContext.getRelayState());
		return request;

	}

	public MOAResponse decodeRespone(HttpServletRequest req,
			HttpServletResponse resp) throws MessageDecodingException,
			SecurityException {

		HTTPPostDecoder decode = new HTTPPostDecoder(new BasicParserPool());
		BasicSAMLMessageContext<Response, ?, ?> messageContext = new BasicSAMLMessageContext<Response, SAMLObject, SAMLObject>();
		messageContext
				.setInboundMessageTransport(new HttpServletRequestAdapter(req));

		messageContext.setPeerEntityRole(SPSSODescriptor.DEFAULT_ELEMENT_NAME);

		decode.decode(messageContext);

		Response inboundMessage = (Response) messageContext.getInboundMessage();

		MOAResponse moaResponse = new MOAResponse(inboundMessage);
		moaResponse.setVerified(false);
		moaResponse.setEntityMetadata(messageContext.getPeerEntityMetadata());
		return moaResponse;

	}

	public boolean handleDecode(String action, HttpServletRequest req) {
		return (req.getMethod().equals("POST"));
	}
}