/**
 * 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.visibility;

import static org.apache.hadoop.hbase.security.visibility.VisibilityConstants.LABELS_TABLE_NAME;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import com.google.protobuf.ByteString;
import java.io.IOException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellScanner;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.protobuf.generated.VisibilityLabelsProtos.GetAuthsResponse;
import org.apache.hadoop.hbase.protobuf.generated.VisibilityLabelsProtos.VisibilityLabelsResponse;
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.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.ClassRule;
import org.junit.Rule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.rules.TestName;

@Category({SecurityTests.class, MediumTests.class})
public class TestVisibilityLablesWithGroups {

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

  public static final String CONFIDENTIAL = "confidential";
  private static final String SECRET = "secret";
  public static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
  private static final byte[] ROW_1 = Bytes.toBytes("row1");
  private final static byte[] CF = Bytes.toBytes("f");
  private final static byte[] Q1 = Bytes.toBytes("q1");
  private final static byte[] Q2 = Bytes.toBytes("q2");
  private final static byte[] Q3 = Bytes.toBytes("q3");
  private final static byte[] value1 = Bytes.toBytes("value1");
  private final static byte[] value2 = Bytes.toBytes("value2");
  private final static byte[] value3 = Bytes.toBytes("value3");
  public static Configuration conf;

  @Rule
  public final TestName TEST_NAME = new TestName();
  public static User SUPERUSER;
  public static User TESTUSER;

  @BeforeClass
  public static void setupBeforeClass() throws Exception {
    // setup configuration
    conf = TEST_UTIL.getConfiguration();
    VisibilityTestUtil.enableVisiblityLabels(conf);
    // Not setting any SLG class. This means to use the default behavior.
    // Use a group as the super user.
    conf.set("hbase.superuser", "@supergroup");
    TEST_UTIL.startMiniCluster(1);
    // 'admin' has super user permission because it is part of the 'supergroup'
    SUPERUSER = User.createUserForTesting(conf, "admin", new String[] { "supergroup" });
    // 'test' user will inherit 'testgroup' visibility labels
    TESTUSER = User.createUserForTesting(conf, "test", new String[] {"testgroup" });

    // Wait for the labels table to become available
    TEST_UTIL.waitTableEnabled(LABELS_TABLE_NAME.getName(), 50000);

    // Set up for the test
    SUPERUSER.runAs(new PrivilegedExceptionAction<Void>() {
      @Override
      public Void run() throws Exception {
        try (Connection conn = ConnectionFactory.createConnection(conf)) {
          VisibilityClient.addLabels(conn, new String[] { SECRET, CONFIDENTIAL });
          // set auth for @testgroup
          VisibilityClient.setAuths(conn, new String[] { CONFIDENTIAL }, "@testgroup");
        } catch (Throwable t) {
          throw new IOException(t);
        }
        return null;
      }
    });
  }

  @Test
  public void testGroupAuths() throws Exception {
    final TableName tableName = TableName.valueOf(TEST_NAME.getMethodName());
    // create the table
    TEST_UTIL.createTable(tableName, CF);
    // put the data.
    SUPERUSER.runAs(new PrivilegedExceptionAction<Void>() {
      @Override
      public Void run() throws Exception {
        try (Connection connection = ConnectionFactory.createConnection(conf);
             Table table = connection.getTable(tableName)) {
          Put put = new Put(ROW_1);
          put.addColumn(CF, Q1, HConstants.LATEST_TIMESTAMP, value1);
          put.setCellVisibility(new CellVisibility(SECRET));
          table.put(put);
          put = new Put(ROW_1);
          put.addColumn(CF, Q2, HConstants.LATEST_TIMESTAMP, value2);
          put.setCellVisibility(new CellVisibility(CONFIDENTIAL));
          table.put(put);
          put = new Put(ROW_1);
          put.addColumn(CF, Q3, HConstants.LATEST_TIMESTAMP, value3);
          table.put(put);
        }
        return null;
      }
    });

    // 'admin' user is part of 'supergroup', thus can see all the cells.
    SUPERUSER.runAs(new PrivilegedExceptionAction<Void>() {
      @Override
      public Void run() throws Exception {
        try (Connection connection = ConnectionFactory.createConnection(conf);
             Table table = connection.getTable(tableName)) {
          Scan s = new Scan();
          ResultScanner scanner = table.getScanner(s);
          Result[] next = scanner.next(1);

          // Test that super user can see all the cells.
          assertTrue(next.length == 1);
          CellScanner cellScanner = next[0].cellScanner();
          cellScanner.advance();
          Cell current = cellScanner.current();
          assertTrue(Bytes.equals(current.getRowArray(), current.getRowOffset(),
              current.getRowLength(), ROW_1, 0, ROW_1.length));
          assertTrue(Bytes.equals(current.getQualifierArray(), current.getQualifierOffset(),
            current.getQualifierLength(), Q1, 0, Q1.length));
          assertTrue(Bytes.equals(current.getValueArray(), current.getValueOffset(),
            current.getValueLength(), value1, 0, value1.length));
          cellScanner.advance();
          current = cellScanner.current();
          assertTrue(Bytes.equals(current.getRowArray(), current.getRowOffset(),
              current.getRowLength(), ROW_1, 0, ROW_1.length));
          assertTrue(Bytes.equals(current.getQualifierArray(), current.getQualifierOffset(),
            current.getQualifierLength(), Q2, 0, Q2.length));
          assertTrue(Bytes.equals(current.getValueArray(), current.getValueOffset(),
            current.getValueLength(), value2, 0, value2.length));
          cellScanner.advance();
          current = cellScanner.current();
          assertTrue(Bytes.equals(current.getRowArray(), current.getRowOffset(),
              current.getRowLength(), ROW_1, 0, ROW_1.length));
          assertTrue(Bytes.equals(current.getQualifierArray(), current.getQualifierOffset(),
            current.getQualifierLength(), Q3, 0, Q3.length));
          assertTrue(Bytes.equals(current.getValueArray(), current.getValueOffset(),
            current.getValueLength(), value3, 0, value3.length));
        }
        return null;
      }
    });

    // Get testgroup's labels.
    SUPERUSER.runAs(new PrivilegedExceptionAction<Void>() {
      @Override
      public Void run() throws Exception {
        GetAuthsResponse authsResponse = null;
        try (Connection conn = ConnectionFactory.createConnection(conf)) {
          authsResponse = VisibilityClient.getAuths(conn, "@testgroup");
        } catch (Throwable e) {
          fail("Should not have failed");
        }
        List<String> authsList = new ArrayList<>(authsResponse.getAuthList().size());
        for (ByteString authBS : authsResponse.getAuthList()) {
          authsList.add(Bytes.toString(authBS.toByteArray()));
        }
        assertEquals(1, authsList.size());
        assertTrue(authsList.contains(CONFIDENTIAL));
        return null;
      }
    });

    // Test that test user can see what 'testgroup' has been authorized to.
    TESTUSER.runAs(new PrivilegedExceptionAction<Void>() {
      @Override
      public Void run() throws Exception {
        try (Connection connection = ConnectionFactory.createConnection(conf);
             Table table = connection.getTable(tableName)) {
          // Test scan with no auth attribute
          Scan s = new Scan();
          ResultScanner scanner = table.getScanner(s);
          Result[] next = scanner.next(1);

          assertTrue(next.length == 1);
          CellScanner cellScanner = next[0].cellScanner();
          cellScanner.advance();
          Cell current = cellScanner.current();
          // test user can see value2 (CONFIDENTIAL) and value3 (no label)
          assertTrue(Bytes.equals(current.getRowArray(), current.getRowOffset(),
              current.getRowLength(), ROW_1, 0, ROW_1.length));
          assertTrue(Bytes.equals(current.getQualifierArray(), current.getQualifierOffset(),
            current.getQualifierLength(), Q2, 0, Q2.length));
          assertTrue(Bytes.equals(current.getValueArray(), current.getValueOffset(),
            current.getValueLength(), value2, 0, value2.length));
          cellScanner.advance();
          current = cellScanner.current();
          // test user can see value2 (CONFIDENTIAL) and value3 (no label)
          assertTrue(Bytes.equals(current.getRowArray(), current.getRowOffset(),
              current.getRowLength(), ROW_1, 0, ROW_1.length));
          assertTrue(Bytes.equals(current.getQualifierArray(), current.getQualifierOffset(),
            current.getQualifierLength(), Q3, 0, Q3.length));
          assertTrue(Bytes.equals(current.getValueArray(), current.getValueOffset(),
            current.getValueLength(), value3, 0, value3.length));

          // Test scan with correct auth attribute for test user
          Scan s1 = new Scan();
          // test user is entitled to 'CONFIDENTIAL'.
          // If we set both labels in the scan, 'SECRET' will be dropped by the SLGs.
          s1.setAuthorizations(new Authorizations(new String[] { SECRET, CONFIDENTIAL }));
          ResultScanner scanner1 = table.getScanner(s1);
          Result[] next1 = scanner1.next(1);

          assertTrue(next1.length == 1);
          CellScanner cellScanner1 = next1[0].cellScanner();
          cellScanner1.advance();
          Cell current1 = cellScanner1.current();
          // test user can see value2 (CONFIDENTIAL) and value3 (no label)
          assertTrue(Bytes.equals(current1.getRowArray(), current1.getRowOffset(),
            current1.getRowLength(), ROW_1, 0, ROW_1.length));
          assertTrue(Bytes.equals(current1.getQualifierArray(), current1.getQualifierOffset(),
            current1.getQualifierLength(), Q2, 0, Q2.length));
          assertTrue(Bytes.equals(current1.getValueArray(), current1.getValueOffset(),
            current1.getValueLength(), value2, 0, value2.length));
          cellScanner1.advance();
          current1 = cellScanner1.current();
          // test user can see value2 (CONFIDENTIAL) and value3 (no label)
          assertTrue(Bytes.equals(current1.getRowArray(), current1.getRowOffset(),
            current1.getRowLength(), ROW_1, 0, ROW_1.length));
          assertTrue(Bytes.equals(current1.getQualifierArray(), current1.getQualifierOffset(),
            current1.getQualifierLength(), Q3, 0, Q3.length));
          assertTrue(Bytes.equals(current1.getValueArray(), current1.getValueOffset(),
            current1.getValueLength(), value3, 0, value3.length));

          // Test scan with incorrect auth attribute for test user
          Scan s2 = new Scan();
          // test user is entitled to 'CONFIDENTIAL'.
          // If we set 'SECRET', it will be dropped by the SLGs.
          s2.setAuthorizations(new Authorizations(new String[] { SECRET }));
          ResultScanner scanner2 = table.getScanner(s2);
          Result next2 = scanner2.next();
          CellScanner cellScanner2 = next2.cellScanner();
          cellScanner2.advance();
          Cell current2 = cellScanner2.current();
          // This scan will only see value3 (no label)
          assertTrue(Bytes.equals(current2.getRowArray(), current2.getRowOffset(),
            current2.getRowLength(), ROW_1, 0, ROW_1.length));
          assertTrue(Bytes.equals(current2.getQualifierArray(), current2.getQualifierOffset(),
            current2.getQualifierLength(), Q3, 0, Q3.length));
          assertTrue(Bytes.equals(current2.getValueArray(), current2.getValueOffset(),
            current2.getValueLength(), value3, 0, value3.length));

          assertFalse(cellScanner2.advance());
        }
        return null;
      }
    });

    // Clear 'testgroup' of CONFIDENTIAL label.
    SUPERUSER.runAs(new PrivilegedExceptionAction<Void>() {
      @Override
      public Void run() throws Exception {
        VisibilityLabelsResponse response = null;
        try (Connection conn = ConnectionFactory.createConnection(conf)) {
          response = VisibilityClient.clearAuths(conn, new String[] {
            CONFIDENTIAL }, "@testgroup");
        } catch (Throwable e) {
          fail("Should not have failed");
        }
        return null;
      }
    });

    // Get testgroup's labels.  No label is returned.
    SUPERUSER.runAs(new PrivilegedExceptionAction<Void>() {
      @Override
      public Void run() throws Exception {
        GetAuthsResponse authsResponse = null;
        try (Connection conn = ConnectionFactory.createConnection(conf)) {
          authsResponse = VisibilityClient.getAuths(conn, "@testgroup");
        } catch (Throwable e) {
          fail("Should not have failed");
        }
        List<String> authsList = new ArrayList<>(authsResponse.getAuthList().size());
        for (ByteString authBS : authsResponse.getAuthList()) {
          authsList.add(Bytes.toString(authBS.toByteArray()));
        }
        assertEquals(0, authsList.size());
        return null;
      }
    });

    // Test that test user cannot see the cells with the labels anymore.
    TESTUSER.runAs(new PrivilegedExceptionAction<Void>() {
      @Override
      public Void run() throws Exception {
        try (Connection connection = ConnectionFactory.createConnection(conf);
             Table table = connection.getTable(tableName)) {
          Scan s1 = new Scan();
          // test user is not entitled to 'CONFIDENTIAL' anymore since we dropped
          // testgroup's label.  test user has no auth labels now.
          // scan's labels will be dropped on the server side.
          s1.setAuthorizations(new Authorizations(new String[] { SECRET, CONFIDENTIAL }));
          ResultScanner scanner1 = table.getScanner(s1);
          Result[] next1 = scanner1.next(1);

          assertTrue(next1.length == 1);
          CellScanner cellScanner1 = next1[0].cellScanner();
          cellScanner1.advance();
          Cell current1 = cellScanner1.current();
          // test user can only see value3 (no label)
          assertTrue(Bytes.equals(current1.getRowArray(), current1.getRowOffset(),
            current1.getRowLength(), ROW_1, 0, ROW_1.length));
          assertTrue(Bytes.equals(current1.getQualifierArray(), current1.getQualifierOffset(),
            current1.getQualifierLength(), Q3, 0, Q3.length));
          assertTrue(Bytes.equals(current1.getValueArray(), current1.getValueOffset(),
            current1.getValueLength(), value3, 0, value3.length));

          assertFalse(cellScanner1.advance());
        }
        return null;
      }
    });

  }

  @AfterClass
  public static void tearDownAfterClass() throws Exception {
    TEST_UTIL.shutdownMiniCluster();
  }
}