content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache 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.apache.org/licenses/LICENSE-2.0
   *
   * 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.apache.activemq.jaas;
  
  import java.io.IOException;
  
  import javax.security.auth.callback.Callback;
  import javax.security.auth.callback.CallbackHandler;
  import javax.security.auth.callback.NameCallback;
  import javax.security.auth.callback.PasswordCallback;
  import javax.security.auth.callback.UnsupportedCallbackException;
  
  /**
   * A JASS username password CallbackHandler.
   */
  public class JassCredentialCallbackHandler implements CallbackHandler {
  
      private final String username;
      private final String password;
  
      public JassCredentialCallbackHandler(String username, String password) {
          this.username = username;
          this.password = password;
      }
  
      @Override
      public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
          for (int i = 0; i < callbacks.length; i++) {
              Callback callback = callbacks[i];
              if (callback instanceof PasswordCallback) {
                  PasswordCallback passwordCallback = (PasswordCallback)callback;
                  if (password == null) {
                      passwordCallback.setPassword(null);
                  } else {
                      passwordCallback.setPassword(password.toCharArray());
                  }
              } else if (callback instanceof NameCallback) {
                  NameCallback nameCallback = (NameCallback)callback;
                  if (username == null) {
                      nameCallback.setName(null);
                  } else {
                      nameCallback.setName(username);
                  }
              }
          }
      }
  }
  