/**
 * 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;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.crypto.key.JavaKeyStoreProvider;
import org.apache.hadoop.crypto.key.KeyProviderCryptoExtension;
import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.fs.FileSystemTestHelper;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.client.CreateEncryptionZoneFlag;
import org.apache.hadoop.hdfs.server.namenode.ha.HATestUtil;
import org.apache.hadoop.hdfs.client.HdfsAdmin;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

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

/**
 * Tests interaction of encryption zones with HA failover.
 */
public class TestEncryptionZonesWithHA {
  private Configuration conf;
  private MiniDFSCluster cluster;
  private NameNode nn0;
  private NameNode nn1;
  private DistributedFileSystem fs;
  private HdfsAdmin dfsAdmin0;
  private HdfsAdmin dfsAdmin1;
  private FileSystemTestHelper fsHelper;
  private File testRootDir;

  private final String TEST_KEY = "test_key";
  protected static final EnumSet< CreateEncryptionZoneFlag > NO_TRASH =
      EnumSet.of(CreateEncryptionZoneFlag.NO_TRASH);

  @Before
  public void setupCluster() throws Exception {
    conf = new Configuration();
    conf.setInt(DFSConfigKeys.DFS_HA_TAILEDITS_PERIOD_KEY, 1);
    HAUtil.setAllowStandbyReads(conf, true);
    fsHelper = new FileSystemTestHelper();
    String testRoot = fsHelper.getTestRootDir();
    testRootDir = new File(testRoot).getAbsoluteFile();
    conf.set(CommonConfigurationKeysPublic.HADOOP_SECURITY_KEY_PROVIDER_PATH,
        JavaKeyStoreProvider.SCHEME_NAME + "://file" +
        new Path(testRootDir.toString(), "test.jks").toUri()
    );

    cluster = new MiniDFSCluster.Builder(conf)
      .nnTopology(MiniDFSNNTopology.simpleHATopology())
      .numDataNodes(1)
      .build();
    cluster.waitActive();
    cluster.transitionToActive(0);

    fs = (DistributedFileSystem)HATestUtil.configureFailoverFs(cluster, conf);
    DFSTestUtil.createKey(TEST_KEY, cluster, 0, conf);
    DFSTestUtil.createKey(TEST_KEY, cluster, 1, conf);
    nn0 = cluster.getNameNode(0);
    nn1 = cluster.getNameNode(1);
    dfsAdmin0 = new HdfsAdmin(cluster.getURI(0), conf);
    dfsAdmin1 = new HdfsAdmin(cluster.getURI(1), conf);
    KeyProviderCryptoExtension nn0Provider =
        cluster.getNameNode(0).getNamesystem().getProvider();
    fs.getClient().setKeyProvider(nn0Provider);
  }

  @After
  public void shutdownCluster() throws IOException {
    if (cluster != null) {
      cluster.shutdown();
      cluster = null;
    }
  }

  /**
   * Test that encryption zones are properly tracked by the standby.
   */
  @Test(timeout = 60000)
  public void testEncryptionZonesTrackedOnStandby() throws Exception {
    final int len = 8196;
    final Path dir = new Path("/enc");
    final Path dirChild = new Path(dir, "child");
    final Path dirFile = new Path(dir, "file");
    fs.mkdir(dir, FsPermission.getDirDefault());
    dfsAdmin0.createEncryptionZone(dir, TEST_KEY, NO_TRASH);
    fs.mkdir(dirChild, FsPermission.getDirDefault());
    DFSTestUtil.createFile(fs, dirFile, len, (short) 1, 0xFEED);
    String contents = DFSTestUtil.readFile(fs, dirFile);

    // Failover the current standby to active.
    HATestUtil.waitForStandbyToCatchUp(nn0, nn1);
    cluster.shutdownNameNode(0);
    cluster.transitionToActive(1);

    Assert.assertEquals("Got unexpected ez path", dir.toString(),
        dfsAdmin1.getEncryptionZoneForPath(dir).getPath().toString());
    Assert.assertEquals("Got unexpected ez path", dir.toString(),
        dfsAdmin1.getEncryptionZoneForPath(dirChild).getPath().toString());
    Assert.assertEquals("File contents after failover were changed",
        contents, DFSTestUtil.readFile(fs, dirFile));
  }

}