/**
 * 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.hbase.security.token;

import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHORIZATION;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import com.google.protobuf.BlockingService;
import com.google.protobuf.RpcController;
import com.google.protobuf.ServiceException;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hbase.ChoreService;
import org.apache.hadoop.hbase.ClusterId;
import org.apache.hadoop.hbase.CoordinatedStateManager;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.client.ClusterConnection;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.coprocessor.HasRegionServerServices;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
import org.apache.hadoop.hbase.ipc.FifoRpcScheduler;
import org.apache.hadoop.hbase.ipc.NettyRpcServer;
import org.apache.hadoop.hbase.ipc.RpcServer;
import org.apache.hadoop.hbase.ipc.RpcServer.BlockingServiceAndInterface;
import org.apache.hadoop.hbase.ipc.RpcServerFactory;
import org.apache.hadoop.hbase.ipc.RpcServerInterface;
import org.apache.hadoop.hbase.ipc.ServerRpcController;
import org.apache.hadoop.hbase.ipc.SimpleRpcServer;
import org.apache.hadoop.hbase.log.HBaseMarkers;
import org.apache.hadoop.hbase.protobuf.generated.AuthenticationProtos;
import org.apache.hadoop.hbase.regionserver.RegionServerServices;
import org.apache.hadoop.hbase.security.SecurityInfo;
import org.apache.hadoop.hbase.security.User;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.testclassification.SecurityTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.util.Sleeper;
import org.apache.hadoop.hbase.util.Strings;
import org.apache.hadoop.hbase.util.Threads;
import org.apache.hadoop.hbase.util.Writables;
import org.apache.hadoop.hbase.zookeeper.ZKClusterId;
import org.apache.hadoop.hbase.zookeeper.ZKWatcher;
import org.apache.hadoop.net.DNS;
import org.apache.hadoop.security.authorize.PolicyProvider;
import org.apache.hadoop.security.authorize.Service;
import org.apache.hadoop.security.token.SecretManager;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.TokenIdentifier;
import org.junit.After;
import org.junit.Before;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.Parameterized.Parameters;
import org.mockito.Mockito;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.hbase.thirdparty.com.google.protobuf.Descriptors.MethodDescriptor;
import org.apache.hbase.thirdparty.com.google.protobuf.Descriptors.ServiceDescriptor;
import org.apache.hbase.thirdparty.com.google.protobuf.Message;

/**
 * Tests for authentication token creation and usage
 */
// This test does a fancy trick where it uses RpcServer and plugs in the Token Service for RpcServer
// to offer up. It worked find pre-hbase-2.0.0 but post the shading project, it fails because
// RpcServer is all about shaded protobuf whereas the Token Service is a CPEP which does non-shaded
// protobufs. Since hbase-2.0.0, we added convertion from shaded to  non-shaded so this test keeps
// working.
@RunWith(Parameterized.class)
@Category({SecurityTests.class, MediumTests.class})
public class TestTokenAuthentication {

  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
      HBaseClassTestRule.forClass(TestTokenAuthentication.class);

  static {
    // Setting whatever system properties after recommendation from
    // http://docs.oracle.com/javase/6/docs/technotes/guides/security/jgss/tutorials/KerberosReq.html
    System.setProperty("java.security.krb5.realm", "hbase");
    System.setProperty("java.security.krb5.kdc", "blah");
  }

  /**
   * Basic server process for RPC authentication testing
   */
  private static class TokenServer extends TokenProvider implements
      AuthenticationProtos.AuthenticationService.BlockingInterface, Runnable, Server {
    private static final Logger LOG = LoggerFactory.getLogger(TokenServer.class);
    private Configuration conf;
    private HBaseTestingUtility TEST_UTIL;
    private RpcServerInterface rpcServer;
    private InetSocketAddress isa;
    private ZKWatcher zookeeper;
    private Sleeper sleeper;
    private boolean started = false;
    private boolean aborted = false;
    private boolean stopped = false;
    private long startcode;

    public TokenServer(Configuration conf, HBaseTestingUtility TEST_UTIL) throws IOException {
      this.conf = conf;
      this.TEST_UTIL = TEST_UTIL;
      this.startcode = EnvironmentEdgeManager.currentTime();
      // Server to handle client requests.
      String hostname =
        Strings.domainNamePointerToHostName(DNS.getDefaultHost("default", "default"));
      int port = 0;
      // Creation of an ISA will force a resolve.
      InetSocketAddress initialIsa = new InetSocketAddress(hostname, port);
      if (initialIsa.getAddress() == null) {
        throw new IllegalArgumentException("Failed resolve of " + initialIsa);
      }
      final List<BlockingServiceAndInterface> sai = new ArrayList<>(1);
      // Make a proxy to go between the shaded Service that rpc expects and the
      // non-shaded Service this CPEP is providing. This is because this test does a neat
      // little trick of testing the CPEP Service by inserting it as RpcServer Service. This
      // worked fine before we shaded PB. Now we need these proxies.
      final BlockingService service =
        AuthenticationProtos.AuthenticationService.newReflectiveBlockingService(this);
      final org.apache.hbase.thirdparty.com.google.protobuf.BlockingService proxy =
        new org.apache.hbase.thirdparty.com.google.protobuf.BlockingService() {
          @Override
          public Message callBlockingMethod(MethodDescriptor md,
              org.apache.hbase.thirdparty.com.google.protobuf.RpcController controller,
              Message param)
              throws org.apache.hbase.thirdparty.com.google.protobuf.ServiceException {
            com.google.protobuf.Descriptors.MethodDescriptor methodDescriptor =
              service.getDescriptorForType().findMethodByName(md.getName());
            com.google.protobuf.Message request = service.getRequestPrototype(methodDescriptor);
            // TODO: Convert rpcController
            com.google.protobuf.Message response = null;
            try {
              response = service.callBlockingMethod(methodDescriptor, null, request);
            } catch (ServiceException e) {
              throw new org.apache.hbase.thirdparty.com.google.protobuf.ServiceException(e);
            }
            return null;// Convert 'response'.
          }

          @Override
          public ServiceDescriptor getDescriptorForType() {
            return null;
          }

          @Override
          public Message getRequestPrototype(MethodDescriptor arg0) {
            // TODO Auto-generated method stub
            return null;
          }

          @Override
          public Message getResponsePrototype(MethodDescriptor arg0) {
            // TODO Auto-generated method stub
            return null;
          }
        };
      sai.add(new BlockingServiceAndInterface(proxy,
        AuthenticationProtos.AuthenticationService.BlockingInterface.class));
      this.rpcServer = RpcServerFactory.createRpcServer(this, "tokenServer", sai, initialIsa, conf,
          new FifoRpcScheduler(conf, 1));
      InetSocketAddress address = rpcServer.getListenerAddress();
      if (address == null) {
        throw new IOException("Listener channel is closed");
      }
      this.isa = address;
      this.sleeper = new Sleeper(1000, this);
    }

    @Override
    public Configuration getConfiguration() {
      return conf;
    }

    @Override
    public ClusterConnection getConnection() {
      return null;
    }

    @Override
    public ZKWatcher getZooKeeper() {
      return zookeeper;
    }

    @Override
    public CoordinatedStateManager getCoordinatedStateManager() {
      return null;
    }

    @Override
    public boolean isAborted() {
      return aborted;
    }

    @Override
    public ServerName getServerName() {
      return ServerName.valueOf(isa.getHostName(), isa.getPort(), startcode);
    }

    @Override
    public FileSystem getFileSystem() {
      return null;
    }

    @Override
    public boolean isStopping() {
      return this.stopped;
    }

    @Override
    public void abort(String reason, Throwable error) {
      LOG.error(HBaseMarkers.FATAL, "Aborting on: "+reason, error);
      this.aborted = true;
      this.stopped = true;
      sleeper.skipSleepCycle();
    }

    private void initialize() throws IOException {
      // ZK configuration must _not_ have hbase.security.authentication or it will require SASL auth
      Configuration zkConf = new Configuration(conf);
      zkConf.set(User.HBASE_SECURITY_CONF_KEY, "simple");
      this.zookeeper = new ZKWatcher(zkConf, TokenServer.class.getSimpleName(),
          this, true);
      this.rpcServer.start();

      // Mock up region coprocessor environment
      RegionCoprocessorEnvironment mockRegionCpEnv = mock(RegionCoprocessorEnvironment.class,
          Mockito.withSettings().extraInterfaces(HasRegionServerServices.class));
      when(mockRegionCpEnv.getConfiguration()).thenReturn(conf);
      when(mockRegionCpEnv.getClassLoader()).then(
          (var1) -> Thread.currentThread().getContextClassLoader());
      RegionServerServices mockRss = mock(RegionServerServices.class);
      when(mockRss.getRpcServer()).thenReturn(rpcServer);
      when(((HasRegionServerServices) mockRegionCpEnv).getRegionServerServices())
          .thenReturn(mockRss);

      super.start(mockRegionCpEnv);
      started = true;
    }

    @Override
    public void run() {
      try {
        initialize();
        while (!stopped) {
          this.sleeper.sleep();
        }
      } catch (Exception e) {
        abort(e.getMessage(), e);
      }
      this.rpcServer.stop();
    }

    public boolean isStarted() {
      return started;
    }

    @Override
    public void stop(String reason) {
      LOG.info("Stopping due to: "+reason);
      this.stopped = true;
      sleeper.skipSleepCycle();
    }

    @Override
    public boolean isStopped() {
      return stopped;
    }

    public InetSocketAddress getAddress() {
      return isa;
    }

    public SecretManager<? extends TokenIdentifier> getSecretManager() {
      return ((RpcServer)rpcServer).getSecretManager();
    }

    @Override
    public AuthenticationProtos.GetAuthenticationTokenResponse getAuthenticationToken(
        RpcController controller, AuthenticationProtos.GetAuthenticationTokenRequest request)
      throws ServiceException {
      LOG.debug("Authentication token request from " + RpcServer.getRequestUserName().orElse(null));
      // Ignore above passed in controller -- it is always null
      ServerRpcController serverController = new ServerRpcController();
      final NonShadedBlockingRpcCallback<AuthenticationProtos.GetAuthenticationTokenResponse>
        callback = new NonShadedBlockingRpcCallback<>();
      getAuthenticationToken(null, request, callback);
      try {
        serverController.checkFailed();
        return callback.get();
      } catch (IOException ioe) {
        throw new ServiceException(ioe);
      }
    }

    @Override
    public AuthenticationProtos.WhoAmIResponse whoAmI(
        RpcController controller, AuthenticationProtos.WhoAmIRequest request)
      throws ServiceException {
      LOG.debug("whoAmI() request from " + RpcServer.getRequestUserName().orElse(null));
      // Ignore above passed in controller -- it is always null
      ServerRpcController serverController = new ServerRpcController();
      NonShadedBlockingRpcCallback<AuthenticationProtos.WhoAmIResponse> callback =
          new NonShadedBlockingRpcCallback<>();
      whoAmI(null, request, callback);
      try {
        serverController.checkFailed();
        return callback.get();
      } catch (IOException ioe) {
        throw new ServiceException(ioe);
      }
    }

    @Override
    public ChoreService getChoreService() {
      return null;
    }

    @Override
    public ClusterConnection getClusterConnection() {
      // TODO Auto-generated method stub
      return null;
    }

    @Override
    public Connection createConnection(Configuration conf) throws IOException {
      return null;
    }
  }

  @Parameters(name = "{index}: rpcServerImpl={0}")
  public static Collection<Object[]> parameters() {
    return Arrays.asList(new Object[] { SimpleRpcServer.class.getName() },
        new Object[] { NettyRpcServer.class.getName() });
  }

  @Parameter(0)
  public String rpcServerImpl;

  private HBaseTestingUtility TEST_UTIL;
  private TokenServer server;
  private Thread serverThread;
  private AuthenticationTokenSecretManager secretManager;
  private ClusterId clusterId = new ClusterId();

  @Before
  public void setUp() throws Exception {
    TEST_UTIL = new HBaseTestingUtility();
    // Override the connection registry to avoid spinning up a mini cluster for the connection below
    // to go through.
    TEST_UTIL.getConfiguration().set(HConstants.CLIENT_CONNECTION_REGISTRY_IMPL_CONF_KEY,
        HConstants.ZK_CONNECTION_REGISTRY_CLASS);
    TEST_UTIL.startMiniZKCluster();
    // register token type for protocol
    SecurityInfo.addInfo(AuthenticationProtos.AuthenticationService.getDescriptor().getName(),
      new SecurityInfo("hbase.test.kerberos.principal",
        AuthenticationProtos.TokenIdentifier.Kind.HBASE_AUTH_TOKEN));
    // security settings only added after startup so that ZK does not require SASL
    Configuration conf = TEST_UTIL.getConfiguration();
    conf.set("hadoop.security.authentication", "kerberos");
    conf.set("hbase.security.authentication", "kerberos");
    conf.setBoolean(HADOOP_SECURITY_AUTHORIZATION, true);
    conf.set(RpcServerFactory.CUSTOM_RPC_SERVER_IMPL_CONF_KEY, rpcServerImpl);
    server = new TokenServer(conf, TEST_UTIL);
    serverThread = new Thread(server);
    Threads.setDaemonThreadRunning(serverThread, "TokenServer:"+server.getServerName().toString());
    // wait for startup
    while (!server.isStarted() && !server.isStopped()) {
      Thread.sleep(10);
    }
    server.rpcServer.refreshAuthManager(conf, new PolicyProvider() {
      @Override
      public Service[] getServices() {
        return new Service [] {
          new Service("security.client.protocol.acl",
            AuthenticationProtos.AuthenticationService.BlockingInterface.class)};
      }
    });
    ZKClusterId.setClusterId(server.getZooKeeper(), clusterId);
    secretManager = (AuthenticationTokenSecretManager)server.getSecretManager();
    while(secretManager.getCurrentKey() == null) {
      Thread.sleep(1);
    }
  }

  @After
  public void tearDown() throws Exception {
    server.stop("Test complete");
    Threads.shutdown(serverThread);
    TEST_UTIL.shutdownMiniZKCluster();
  }

  @Test
  public void testTokenCreation() throws Exception {
    Token<AuthenticationTokenIdentifier> token =
        secretManager.generateToken("testuser");

    AuthenticationTokenIdentifier ident = new AuthenticationTokenIdentifier();
    Writables.getWritable(token.getIdentifier(), ident);
    assertEquals("Token username should match", "testuser",
        ident.getUsername());
    byte[] passwd = secretManager.retrievePassword(ident);
    assertTrue("Token password and password from secret manager should match",
        Bytes.equals(token.getPassword(), passwd));
  }
// This won't work any more now RpcServer takes Shaded Service. It depends on RPCServer being able to provide a
// non-shaded service. TODO: FIX. Tried to make RPC generic but then it ripples; have to make Connection generic.
// And Call generic, etc.
//
//  @Test
//  public void testTokenAuthentication() throws Exception {
//    UserGroupInformation testuser =
//        UserGroupInformation.createUserForTesting("testuser", new String[]{"testgroup"});
//    testuser.setAuthenticationMethod(
//        UserGroupInformation.AuthenticationMethod.TOKEN);
//    final Configuration conf = TEST_UTIL.getConfiguration();
//    UserGroupInformation.setConfiguration(conf);
//    Token<AuthenticationTokenIdentifier> token = secretManager.generateToken("testuser");
//    LOG.debug("Got token: " + token.toString());
//    testuser.addToken(token);
//    // Verify the server authenticates us as this token user
//    testuser.doAs(new PrivilegedExceptionAction<Object>() {
//      public Object run() throws Exception {
//        Configuration c = server.getConfiguration();
//        final RpcClient rpcClient = RpcClientFactory.createClient(c, clusterId.toString());
//        ServerName sn =
//            ServerName.valueOf(server.getAddress().getHostName(), server.getAddress().getPort(),
//                System.currentTimeMillis());
//        try {
//          // Make a proxy to go between the shaded RpcController that rpc expects and the
//          // non-shaded controller this CPEP is providing. This is because this test does a neat
//          // little trick of testing the CPEP Service by inserting it as RpcServer Service. This
//          // worked fine before we shaded PB. Now we need these proxies.
//          final org.apache.hbase.thirdparty.com.google.protobuf.BlockingRpcChannel channel =
//              rpcClient.createBlockingRpcChannel(sn, User.getCurrent(), HConstants.DEFAULT_HBASE_RPC_TIMEOUT);
//          AuthenticationProtos.AuthenticationService.BlockingInterface stub =
//              AuthenticationProtos.AuthenticationService.newBlockingStub(channel);
//          AuthenticationProtos.WhoAmIResponse response =
//              stub.whoAmI(null, AuthenticationProtos.WhoAmIRequest.getDefaultInstance());
//          String myname = response.getUsername();
//          assertEquals("testuser", myname);
//          String authMethod = response.getAuthMethod();
//          assertEquals("TOKEN", authMethod);
//        } finally {
//          rpcClient.close();
//        }
//        return null;
//      }
//    });
//  }

  @Test
  public void testUseExistingToken() throws Exception {
    User user = User.createUserForTesting(TEST_UTIL.getConfiguration(), "testuser2",
        new String[]{"testgroup"});
    Token<AuthenticationTokenIdentifier> token =
        secretManager.generateToken(user.getName());
    assertNotNull(token);
    user.addToken(token);

    // make sure we got a token
    Token<AuthenticationTokenIdentifier> firstToken =
        new AuthenticationTokenSelector().selectToken(token.getService(), user.getTokens());
    assertNotNull(firstToken);
    assertEquals(token, firstToken);

    Connection conn = ConnectionFactory.createConnection(TEST_UTIL.getConfiguration());
    try {
      assertFalse(TokenUtil.addTokenIfMissing(conn, user));
      // make sure we still have the same token
      Token<AuthenticationTokenIdentifier> secondToken =
          new AuthenticationTokenSelector().selectToken(token.getService(), user.getTokens());
      assertEquals(firstToken, secondToken);
    } finally {
      conn.close();
    }
  }

  /**
   * A copy of the BlockingRpcCallback class for use locally. Only difference is that it makes
   * use of non-shaded protobufs; i.e. refers to com.google.protobuf.* rather than to
   * org.apache.hbase.thirdparty.com.google.protobuf.*
   */
  private static class NonShadedBlockingRpcCallback<R> implements
      com.google.protobuf.RpcCallback<R> {
    private R result;
    private boolean resultSet = false;

    /**
     * Called on completion of the RPC call with the response object, or {@code null} in the case of
     * an error.
     * @param parameter the response object or {@code null} if an error occurred
     */
    @Override
    public void run(R parameter) {
      synchronized (this) {
        result = parameter;
        resultSet = true;
        this.notifyAll();
      }
    }

    /**
     * Returns the parameter passed to {@link #run(Object)} or {@code null} if a null value was
     * passed.  When used asynchronously, this method will block until the {@link #run(Object)}
     * method has been called.
     * @return the response object or {@code null} if no response was passed
     */
    public synchronized R get() throws IOException {
      while (!resultSet) {
        try {
          this.wait();
        } catch (InterruptedException ie) {
          InterruptedIOException exception = new InterruptedIOException(ie.getMessage());
          exception.initCause(ie);
          throw exception;
        }
      }
      return result;
    }
  }
}