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/**
 * 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.hadoop.hdfs.server.balancer;

import java.io.Closeable;
import java.io.IOException;
import java.util.EnumSet;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.datatransfer.sasl.DataEncryptionKeyFactory;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenSecretManager.AccessMode;
import org.apache.hadoop.hdfs.security.token.block.DataEncryptionKey;
import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.util.Daemon;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.util.Timer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The class provides utilities for key and token management.
 */
@InterfaceAudience.Private
public class KeyManager implements Closeable, DataEncryptionKeyFactory {
  private static final Logger LOG = LoggerFactory.getLogger(KeyManager.class);

  private final NamenodeProtocol namenode;

  private final boolean isBlockTokenEnabled;
  private final boolean encryptDataTransfer;
  private boolean shouldRun;

  private final BlockTokenSecretManager blockTokenSecretManager;
  private final BlockKeyUpdater blockKeyUpdater;
  private DataEncryptionKey encryptionKey;
  /**
   * Timer object for querying the current time. Separated out for
   * unit testing.
   */
  private Timer timer;

  public KeyManager(String blockpoolID, NamenodeProtocol namenode,
      boolean encryptDataTransfer, Configuration conf) throws IOException {
    this.namenode = namenode;
    this.encryptDataTransfer = encryptDataTransfer;
    this.timer = new Timer();

    final ExportedBlockKeys keys = namenode.getBlockKeys();
    this.isBlockTokenEnabled = keys.isBlockTokenEnabled();
    if (isBlockTokenEnabled) {
      long updateInterval = keys.getKeyUpdateInterval();
      long tokenLifetime = keys.getTokenLifetime();
      LOG.info("Block token params received from NN: update interval="
          + StringUtils.formatTime(updateInterval)
          + ", token lifetime=" + StringUtils.formatTime(tokenLifetime));
      String encryptionAlgorithm = conf.get(
          DFSConfigKeys.DFS_DATA_ENCRYPTION_ALGORITHM_KEY);
      this.blockTokenSecretManager = new BlockTokenSecretManager(
          updateInterval, tokenLifetime, blockpoolID, encryptionAlgorithm);
      this.blockTokenSecretManager.addKeys(keys);

      // sync block keys with NN more frequently than NN updates its block keys
      this.blockKeyUpdater = new BlockKeyUpdater(updateInterval / 4);
      this.shouldRun = true;
    } else {
      this.blockTokenSecretManager = null;
      this.blockKeyUpdater = null;
    }
  }
  
  public void startBlockKeyUpdater() {
    if (blockKeyUpdater != null) {
      blockKeyUpdater.daemon.start();
    }
  }

  /** Get an access token for a block. */
  public Token getAccessToken(ExtendedBlock eb
      ) throws IOException {
    if (!isBlockTokenEnabled) {
      return BlockTokenSecretManager.DUMMY_TOKEN;
    } else {
      if (!shouldRun) {
        throw new IOException(
            "Cannot get access token since BlockKeyUpdater is not running");
      }
      return blockTokenSecretManager.generateToken(null, eb,
          EnumSet.of(AccessMode.REPLACE, AccessMode.COPY));
    }
  }

  @Override
  public DataEncryptionKey newDataEncryptionKey() {
    if (encryptDataTransfer) {
      synchronized (this) {
        if (encryptionKey == null ||
            encryptionKey.expiryDate < timer.now()) {
          // Encryption Key (EK) is generated from Block Key (BK).
          // Check if EK is expired, and generate a new one using the current BK
          // if so, otherwise continue to use the previously generated EK.
          //
          // It's important to make sure that when EK is not expired, the BK
          // used to generate the EK is not expired and removed, because
          // the same BK will be used to re-generate the EK
          // by BlockTokenSecretManager.
          //
          // The current implementation ensures that when an EK is not expired
          // (within tokenLifetime), the BK that's used to generate it
          // still has at least "keyUpdateInterval" of life time before
          // the BK gets expired and removed.
          // See BlockTokenSecretManager for details.
          LOG.debug("Generating new data encryption key because current key "
              + (encryptionKey == null ?
              "is null." : "expired on " + encryptionKey.expiryDate));
          encryptionKey = blockTokenSecretManager.generateDataEncryptionKey();
        }
        return encryptionKey;
      }
    } else {
      return null;
    }
  }

  @Override
  public void close() {
    shouldRun = false;
    try {
      if (blockKeyUpdater != null) {
        blockKeyUpdater.daemon.interrupt();
      }
    } catch(Exception e) {
      LOG.warn("Exception shutting down access key updater thread", e);
    }
  }

  /**
   * Periodically updates access keys.
   */
  class BlockKeyUpdater implements Runnable, Closeable {
    private final Daemon daemon = new Daemon(this);
    private final long sleepInterval;

    BlockKeyUpdater(final long sleepInterval) {
      this.sleepInterval = sleepInterval;
      LOG.info("Update block keys every " + StringUtils.formatTime(sleepInterval));
    }

    @Override
    public void run() {
      try {
        while (shouldRun) {
          try {
            blockTokenSecretManager.addKeys(namenode.getBlockKeys());
          } catch (IOException e) {
            LOG.error("Failed to set keys", e);
          }
          Thread.sleep(sleepInterval);
        }
      } catch (InterruptedException e) {
        LOG.debug("InterruptedException in block key updater thread", e);
      } catch (Throwable e) {
        LOG.error("Exception in block key updater thread", e);
        shouldRun = false;
      }
    }

    @Override
    public void close() throws IOException {
      try {
        daemon.interrupt();
      } catch(Exception e) {
        LOG.warn("Exception shutting down key updater thread", e);
      }
    }
  }
}