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.transport.amqp.client.sasl;
  
  /**
   * Implements the SASL PLAIN authentication Mechanism.
   *
   * User name and Password values are sent without being encrypted.
   */
  public class PlainMechanism extends AbstractMechanism {
  
      public static final String MECH_NAME = "PLAIN";
  
      @Override
      public int getPriority() {
          return PRIORITY.MEDIUM.getValue();
      }
  
      @Override
      public String getName() {
          return MECH_NAME;
      }
  
      @Override
      public byte[] getInitialResponse() {
  
          String authzid = getAuthzid();
          String username = getUsername();
          String password = getPassword();
  
          if (authzid == null) {
              authzid = "";
          }
  
          if (username == null) {
              username = "";
          }
  
          if (password == null) {
              password = "";
          }
  
          byte[] authzidBytes = authzid.getBytes();
          byte[] usernameBytes = username.getBytes();
          byte[] passwordBytes = password.getBytes();
          byte[] data = new byte[authzidBytes.length + 1 + usernameBytes.length + 1 + passwordBytes.length];
          System.arraycopy(authzidBytes, 0, data, 0, authzidBytes.length);
          System.arraycopy(usernameBytes, 0, data, 1 + authzidBytes.length, usernameBytes.length);
          System.arraycopy(passwordBytes, 0, data, 2 + authzidBytes.length + usernameBytes.length, passwordBytes.length);
          return data;
      }
  
      @Override
      public byte[] getChallengeResponse(byte[] challenge) {
          return EMPTY;
      }
  
      @Override
      public boolean isApplicable(String username, String password) {
          return username != null && username.length() > 0 && password != null && password.length() > 0;
      }
  }
  