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/**
 * Created : Anirban
 * Date: May 19, 2003
 * Modified by : Chandar
 *
 *  File : ClientAuthenticator.java
 *
 * Overview :
 *     This file defines the client side handler class of SOAP header
 *   Web Service. The handler intercepts the SOAP request from
 *  client, creates a header using client authentication information
 *  and attaches the header to SOAP message  before sending it to
 *  the Web  service.
 */



package oracle.demo.header;

import java.io.*;
   import java.util.Map;

// JAX-RPC imports
import javax.xml.namespace.QName;
import javax.xml.rpc.handler.MessageContext;
import javax.xml.rpc.handler.HandlerInfo;
import javax.xml.rpc.handler.soap.SOAPMessageContext;
import javax.xml.soap.*;
import javax.xml.soap.SOAPFactory;

//utility imports
import java.text.DateFormat;
import java.util.Date;

import com.sun.xml.rpc.soap.message.*;

/**
 * Handler to insert authentication info on the client
 */
public class ClientAuthenticator implements javax.xml.rpc.handler.Handler
{

  // variable holding output stream
  private PrintStream out =System.out;
  private QName[] headers;

  // variable for date
  private DateFormat formater = DateFormat.getDateTimeInstance();

 // variable used for creating SOAPElements
  private static String PREFIX      ="ns0";
  private static String URI           ="http://oracle.j2ee.ws/ejb/Credit";

  // client authentication information
  private static String VALID_ID="SCOTT";
  private static String VALID_PASSWORD="TIGER";



/*
 *  Constructor definition
 */
 public ClientAuthenticator () {
        out.println("--- In ClientAuthenticator Constructor.");
 }

/*
 * This method initializes the handler class
 */

  public void init(HandlerInfo info) {
     out.println("--- In ClientAuthenticator.init ()");
  }

/*
 * The handleFault method processes the SOAP faults based
 * on the SOAP message processing model.
 */

  public boolean handleFault(MessageContext context) {
      out.println("--- In ClientAuthenticator.handleFault ()"
                           + context);
       return true;
  }

 /*
 * The handleRequest method initiates the request processing for this handler.
 * It creates a SOAPHeader element and add the SOAP header to the SOAP
 * message.
 */

  public boolean handleRequest (MessageContext context) {

     out.println("--- In ClientAuthenticator.handleRequest () at "
                                          +formater.format(new Date()));
      try {

          /* add a header with the authentication info into the SOAP message:
           *
           * <env:Header>
           *   <ns0:authHeader1 xmlns:ns0="http://oracle.j2ee.ws/ejb/Credit">
           *      <ns0:id>SCOTT</ns0:id>
           *      <ns0:password>TIGER</ns0:password>
           *   </ns0:authHeader1>
           * </env:Header>
           */
 
         // get SOAP message context
         SOAPMessageContext smc = (SOAPMessageContext) context;

         // get SOAP envelope from SOAP message
         SOAPEnvelope se = smc.getMessage().getSOAPPart().getEnvelope();

         // create instance of SOAP factory
          SOAPFactory sFactory = SOAPFactory.newInstance();

          // create SOAP elements specifying prefix and URI
          SOAPElement sHelem1 = sFactory.createElement("authHeader1",PREFIX,URI);
          SOAPElement sCHelem11 = sFactory.createElement("id",PREFIX,URI);

          // attach value to id element
          sCHelem11.addTextNode("SCOTT");
          SOAPElement sCHelem12 = sFactory.createElement("password",PREFIX,URI);

          // attach value to password element
          sCHelem12.addTextNode("TIGER");

          //add child elements to the root element
          sHelem1.addChildElement(sCHelem11);
          sHelem1.addChildElement(sCHelem12);

         // create SOAPHeader instance for SOAP envelope
          SOAPHeader sh = se.addHeader();

          // add SOAP element for header to SOAP header object
          sh.addChildElement(sHelem1);
       }
        catch (Exception ex) {
            ex.printStackTrace();
        }
        return true;
    }

 /*
 * The handleResponse method initiates the response processing for this handler.
 */
  public boolean handleResponse (MessageContext context) {
      out.println("--- In ClientAuthenticator.handleResponse ()");
    return true;
    }

 /*
 * This method gets the header blocks that can be processed by
 *  this Handler instance
 */

  public javax.xml.namespace.QName[] getHeaders() {
      out.println("--- In ClientAuthenticator.getHeaders ()");
      return null;
  }

 /*
 * The destroy method indicates the end of lifecycle for a Handler instance
 *

 */
  public void destroy() {
      out.println("--- In ClientAuthenticator.destroy ()");
      out.close();
  }

}

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