/**
    * Copyright 2005-2013 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");
              }
          }
      }
  }