package at.gv.egovernment.moa.id.auth.invoke;

import java.util.Vector;

import javax.xml.namespace.QName;
import javax.xml.rpc.Call;
import javax.xml.rpc.Service;
import javax.xml.rpc.ServiceFactory;

import org.apache.axis.message.SOAPBodyElement;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import at.gv.egovernment.moa.id.ServiceException;
import at.gv.egovernment.moa.id.config.ConnectionParameter;
import at.gv.egovernment.moa.id.config.auth.AuthConfigurationProvider;
import at.gv.egovernment.moa.logging.Logger;
import at.gv.egovernment.moa.spss.api.SignatureVerificationService;
import at.gv.egovernment.moa.spss.api.xmlbind.VerifyXMLSignatureRequestParser;
import at.gv.egovernment.moa.spss.api.xmlbind.VerifyXMLSignatureResponseBuilder;
import at.gv.egovernment.moa.spss.api.xmlverify.VerifyXMLSignatureRequest;
import at.gv.egovernment.moa.spss.api.xmlverify.VerifyXMLSignatureResponse;

/**
 * Invoker of the <code>SignatureVerification</code> web service of MOA-SPSS.<br>
 * Either invokes the web service, or calls the corresponding API, depending on configuration data.
 * 
 * @author Stefan Knirsch
 * @version $Id$
 */
public class SignatureVerificationInvoker {
  /** This QName Object identifies the SignatureVerification endpoint of the web service */
  private static final QName SERVICE_QNAME = new QName("SignatureVerification");

  /**
   * Method verifyXMLSignature.
   * @param request to be sent
   * @return Element with the answer
   * @throws ServiceException if an error occurs
   */
  public Element verifyXMLSignature(Element request) throws ServiceException {
    return doCall(SERVICE_QNAME, request);
  }

  /**
   * Method doCall.
   * @param serviceName the name of the service
   * @param request the request to be sent
   * @return Element the answer
   * @throws ServiceException if an error occurs
   */
  protected Element doCall(QName serviceName, Element request) throws ServiceException {
    ConnectionParameter authConnParam = null;
    try {
      Service service = ServiceFactory.newInstance().createService(serviceName);
      Call call = service.createCall();
      SOAPBodyElement body = new SOAPBodyElement(request);
      SOAPBodyElement[] params = new SOAPBodyElement[] { body };
      Vector responses;
      SOAPBodyElement response;

      String endPoint;
      AuthConfigurationProvider authConfigProvider = AuthConfigurationProvider.getInstance();
      authConnParam = authConfigProvider.getMoaSpConnectionParameter();

      //If the ConnectionParameter do NOT exist, we try to get the api to work....
      if (authConnParam != null) {
        endPoint = authConnParam.getUrl();
        call.setTargetEndpointAddress(endPoint);
        responses = (Vector) call.invoke(serviceName, params);
        response = (SOAPBodyElement) responses.get(0);
        return response.getAsDOM();
      }
      else {
        SignatureVerificationService svs = SignatureVerificationService.getInstance();
        VerifyXMLSignatureRequest vsrequest = new VerifyXMLSignatureRequestParser().parse(request);
        VerifyXMLSignatureResponse vsresponse = svs.verifyXMLSignature(vsrequest);

        Document result = new VerifyXMLSignatureResponseBuilder().build(vsresponse);
        Logger.setHierarchy("moa.id.auth");
        return result.getDocumentElement();
      }
    }
    catch (Exception ex) {
      if (authConnParam != null)
        throw new ServiceException("service.00", new Object[] { ex.toString()}, ex);
      else
        throw new ServiceException("service.03", new Object[] { ex.toString()}, ex);
    }
  }
}