SSLTransportFactory.java

package org.opennaas.extensions.transports.sockets;

import org.opennaas.core.resources.protocol.ProtocolSessionContext;
import org.opennaas.core.resources.transport.ITransport;
import org.opennaas.core.resources.transport.ITransportConstants;
import org.opennaas.core.resources.transport.ITransportFactory;
import org.opennaas.core.resources.transport.TransportException;

/**
 * Provides a factory method to create SSL transport instances. The following properties need to be present in the capability descriptor: transport =
 * SSL transport.host = <ip_address or hostname> transport.port = <port number> transport.keystore = <path to keystore file>
 * transport.keystorePassword = <password of the keystore>
 */
public class SSLTransportFactory implements ITransportFactory {

	public ITransport createTransportInstance(ProtocolSessionContext protocolSessionContext) throws TransportException {
		String transportId = null;
		try {
			transportId = (String) protocolSessionContext.getSessionParameters().get(ITransportConstants.TRANSPORT);
		} catch (ClassCastException ex) {
			throw new TransportException(ex.getMessage());
		}

		if (transportId == null) {
			throw new TransportException("No transport id has been specified at the resource configuration");
		} else if (transportId.equals(SSLTransport.SSL)) {
			return createSSLTransport(protocolSessionContext);
		} else {
			throw new TransportException("Transport " + transportId + " cannot be created by this factory");
		}
	}

	private ITransport createSSLTransport(ProtocolSessionContext protocolSessionContext) throws TransportException {
		String host = getAndValidateProperty(protocolSessionContext, ITransportConstants.TRANSPORT_HOST);
		String port = getAndValidateProperty(protocolSessionContext, ITransportConstants.TRANSPORT_PORT);
		String keystore = getAndValidateProperty(protocolSessionContext, ITransportConstants.TRANSPORT_KEYSTORE);
		String keystorePassword = getAndValidateProperty(protocolSessionContext, ITransportConstants.TRANSPORT_KEYSTORE_PASSWORD);
		return new SSLTransport(host, port, keystore, keystorePassword);
	}

	private String getAndValidateProperty(ProtocolSessionContext protocolSessionContext, String propertyName) throws TransportException {
		String property = null;
		try {
			property = (String) protocolSessionContext.getSessionParameters().get(propertyName);
		} catch (ClassCastException ex) {
			throw new TransportException(ex.getMessage());
		}

		if (property == null) {
			throw new TransportException("Could not create an instance of transport. Property " + propertyName + " has not been specified");
		}

		return property;
	}
}