/**
 * 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.tez.runtime.library.shuffle.common;

import java.io.IOException;
import java.nio.ByteBuffer;

import javax.crypto.SecretKey;

import org.apache.hadoop.io.DataInputByteBuffer;
import org.apache.hadoop.io.DataOutputBuffer;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.tez.runtime.library.common.security.JobTokenIdentifier;
import org.apache.tez.runtime.library.common.security.JobTokenSecretManager;

public class ShuffleUtils {

  public static String SHUFFLE_HANDLER_SERVICE_ID = "mapreduce.shuffle";

  public static SecretKey getJobTokenSecretFromTokenBytes(ByteBuffer meta)
      throws IOException {
    DataInputByteBuffer in = new DataInputByteBuffer();
    in.reset(meta);
    Token<JobTokenIdentifier> jt = new Token<JobTokenIdentifier>();
    jt.readFields(in);
    SecretKey sk = JobTokenSecretManager.createSecretKey(jt.getPassword());
    return sk;
  }

  public static ByteBuffer convertJobTokenToBytes(
      Token<JobTokenIdentifier> jobToken) throws IOException {
    DataOutputBuffer dob = new DataOutputBuffer();
    jobToken.write(dob);
    ByteBuffer bb = ByteBuffer.wrap(dob.getData(), 0, dob.getLength());
    return bb;
  }

  public static int deserializeShuffleProviderMetaData(ByteBuffer meta)
      throws IOException {
    DataInputByteBuffer in = new DataInputByteBuffer();
    try {
      in.reset(meta);
      int port = in.readInt();
      return port;
    } finally {
      in.close();
    }
  }
  
  // TODO NEWTEZ handle ssl shuffle
  public static StringBuilder constructBaseURIForShuffleHandler(String host, int port, int partition, ApplicationId appId) {
    StringBuilder sb = new StringBuilder("http://");
    sb.append(host);
    sb.append(":");
    sb.append(String.valueOf(port));
    sb.append("/");
    sb.append("mapOutput?job=");
    sb.append(appId.toString().replace("application", "job"));
    sb.append("&reduce=");
    sb.append(String.valueOf(partition));
    sb.append("&map=");
    return sb;
  }
}