/*
    * 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.giraph.comm.requests;
  
  import org.apache.giraph.comm.netty.SaslNettyServer;
  import org.apache.log4j.Logger;
  import java.io.DataInput;
  import java.io.DataOutput;
  import java.io.IOException;
  
  /**
   * Send and receive SASL tokens.
   */
  public class SaslTokenMessageRequest extends WritableRequest {
    /** Class logger */
    private static final Logger LOG =
        Logger.getLogger(SaslTokenMessageRequest.class);
  
    /** Used for client or server's token to send or receive from each other. */
    private byte[] token;
  
    /**
     * Constructor used for reflection only.
     */
    public SaslTokenMessageRequest() { }
  
   /**
     * Constructor used to send request.
     *
     * @param token the SASL token, generated by a SaslClient or SaslServer.
     */
    public SaslTokenMessageRequest(byte[] token) {
      this.token = token;
    }
  
    /**
     * Read accessor for SASL token
     *
     * @return saslToken SASL token
     */
    public byte[] getSaslToken() {
      return token;
    }
  
    /**
     * Write accessor for SASL token
     *
     * @param token SASL token
     */
    public void setSaslToken(byte[] token) {
      this.token = token;
    }
  
    @Override
    public RequestType getType() {
      return RequestType.SASL_TOKEN_MESSAGE_REQUEST;
    }
  
    @Override
    public void readFieldsRequest(DataInput input) throws IOException {
      int tokenSize = input.readInt();
      token = new byte[tokenSize];
      input.readFully(token);
    }
  
    /**
     * Update server's token in response to the SASL token received from
     * client. Updated token is sent to client by
     * SaslServerHandler.messageReceived().
     *
     * @param saslNettyServer used to create response.
     */
  
    public void processToken(SaslNettyServer saslNettyServer) {
      if (LOG.isDebugEnabled()) {
        LOG.debug("processToken:  With nettyServer: " + saslNettyServer +
            " and token length: " + token.length);
      }
      token = saslNettyServer.response(token);
      if (LOG.isDebugEnabled()) {
        LOG.debug("processToken: Response token's length is:" + token.length);
      }
    }
 
   @Override
   public void writeRequest(DataOutput output) throws IOException {
     output.writeInt(token.length);
     output.write(token);
   }
 
   @Override
   public int getSerializedSize() {
     return super.getSerializedSize() + 4 + token.length;
   }
 }