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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.cassandra.cql3.functions.masking;
  
  import java.nio.ByteBuffer;
  
  import org.junit.Assert;
  import org.junit.BeforeClass;
  
  import com.datastax.driver.core.ColumnDefinitions;
  import com.datastax.driver.core.DataType;
  import com.datastax.driver.core.ResultSet;
  import org.apache.cassandra.cql3.CQL3Type;
  import org.apache.cassandra.exceptions.InvalidRequestException;
  import org.apache.cassandra.schema.SchemaConstants;
  
  import static java.lang.String.format;
  
  /**
   * Tests for {@link HashMaskingFunction}.
   */
  public class HashMaskingFunctionTest extends MaskingFunctionTester
  {
      @BeforeClass
      public static void beforeClass()
      {
          requireNetwork();
      }
  
      @Override
      protected void testMaskingOnColumn(String name, CQL3Type type, Object value) throws Throwable
      {
          ByteBuffer serializedValue = serializedValue(type, value);
  
          // with default algorithm
          assertRows(execute(format("SELECT mask_hash(%s) FROM %%s", name)),
                     row(HashMaskingFunction.hash(HashMaskingFunction.messageDigest(HashMaskingFunction.DEFAULT_ALGORITHM),
                                                  serializedValue)));
  
          // with null algorithm
          assertRows(execute(format("SELECT mask_hash(%s, null) FROM %%s", name)),
                     row(HashMaskingFunction.hash(HashMaskingFunction.messageDigest(HashMaskingFunction.DEFAULT_ALGORITHM),
                                                  serializedValue)));
  
          // with manually specified algorithm
          assertRows(execute(format("SELECT mask_hash(%s, 'SHA-512') FROM %%s", name)),
                     row(HashMaskingFunction.hash(HashMaskingFunction.messageDigest("SHA-512"), serializedValue)));
  
          // with not found ASCII algorithm
          assertInvalidThrowMessage("Hash algorithm not found",
                                    InvalidRequestException.class,
                                    format("SELECT mask_hash(%s, 'unknown-algorithm') FROM %%s", name));
  
          // with not found UTF-8 algorithm
          assertInvalidThrowMessage("Hash algorithm not found",
                                    InvalidRequestException.class,
                                    format("SELECT mask_hash(%s, 'áéíóú') FROM %%s", name));
  
          // test result set metadata, it should always be of type blob
          ResultSet rs = executeNet(format("SELECT mask_hash(%s) FROM %%s", name));
          ColumnDefinitions definitions = rs.getColumnDefinitions();
          Assert.assertEquals(1, definitions.size());
          Assert.assertEquals(DataType.blob(), definitions.getType(0));
          Assert.assertEquals(format("%s.mask_hash(%s)", SchemaConstants.SYSTEM_KEYSPACE_NAME, name),
                              definitions.getName(0));
      }
  
      private ByteBuffer serializedValue(CQL3Type type, Object value)
      {
          if (isNullOrEmptyMultiCell(type, value))
              return null;
  
          return makeByteBuffer(value, type.getType());
      }
  }
  