/**

  * Copyright 2005-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  * http://www.opensource.org/licenses/ecl2.php

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.rice.ksb.config.wss4j;

 import org.apache.ws.security.WSPasswordCallback;

 import org.kuali.rice.core.api.config.ConfigurationException;

 import org.kuali.rice.core.api.config.property.Config;

 import org.kuali.rice.core.api.config.property.ConfigContext;

 import javax.security.auth.callback.Callback;

 import javax.security.auth.callback.CallbackHandler;

 import javax.security.auth.callback.UnsupportedCallbackException;

 import java.io.IOException;

 /**

  * Workflow CryptoPasswordCallbackHandler which retrieves the keystore password

  * from the workflow Config.

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class CryptoPasswordCallbackHandler implements CallbackHandler {

     /**

      * The actual CallBackHandler implementation.

      */

     public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {

         for (int i = 0; i < callbacks.length; i++) {

             if (callbacks[i] instanceof WSPasswordCallback) {

                 WSPasswordCallback pc = (WSPasswordCallback) callbacks[i];

                 String password = ConfigContext.getCurrentContextConfig().getKeystorePassword();

                 if (password == null) {

                         throw new ConfigurationException("Could not locate the webservice password.  Should be configured as the '" + Config.KEYSTORE_PASSWORD + "' property.");

                 }

                 pc.setPassword(password);

             } else {

                 throw new UnsupportedCallbackException(callbacks[i], "Unrecognized Callback");

             }

         }

     }

 }