content: /*****************************************************************
   *   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
   *
   *    https://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.cayenne.crypto.transformer.bytes;
  
  import static org.junit.Assert.assertArrayEquals;
  import static org.junit.Assert.assertEquals;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.ArgumentMatchers.anyInt;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  
  import org.apache.cayenne.crypto.unit.CryptoUnitUtils;
  import org.junit.Test;
  import org.mockito.stubbing.Answer;
  
  public class GzipEncryptorTest {
  
      @Test
      public void testGzip() throws IOException {
  
          byte[] input1 = "Hello Hello Hello".getBytes(StandardCharsets.UTF_8);
          byte[] output1 = GzipEncryptor.gzip(input1);
          byte[] expectedOutput1 = CryptoUnitUtils.hexToBytes("1f8b0800000000000000f348cdc9c957f0409000a91a078c11000000");
  
          // since JDK 16, gzip call sets OS flag to 255, that means "unknown", previous versions set this byte to 0
          // see http://www.zlib.org/rfc-gzip.html spec for gzip header bytes details
          if(output1.length > 8 && output1[9] == -1) {
              output1[9] = 0;
          }
  
          assertArrayEquals(expectedOutput1, output1);
      }
  
      @Test
      public void testEncrypt() {
  
          BytesEncryptor delegate = mock(BytesEncryptor.class);
          when(delegate.encrypt(any(byte[].class), anyInt(), any(byte[].class))).thenAnswer((Answer<byte[]>) invocation -> {
              Object[] args = invocation.getArguments();
  
              byte[] answer = (byte[]) args[0];
              int offset = (Integer) args[1];
  
              assertEquals(1, offset);
  
              return answer;
          });
  
          GzipEncryptor e = new GzipEncryptor(delegate);
  
          byte[] input1 = "Hello Hello Hello".getBytes(StandardCharsets.UTF_8);
          byte[] output1 = e.encrypt(input1, 1, new byte[1]);
          byte[] expectedOutput1 = input1;
  
          assertArrayEquals(expectedOutput1, output1);
  
          byte[] input2 = ("Hello AAAAA Hello AAAAA Hello AAAAA Hello AAAAA Hello AAAAA Hello AAAAA Hello "
                  + "Hello AAAAA Hello AAAAA Hello AAAAA Hello AAAAA Hello AAAAA Hello AAAAA Hello").getBytes(StandardCharsets.UTF_8);
          byte[] output2 = e.encrypt(input2, 1, new byte[1]);
  
          // somehow 'gzip -c' fills bytes 3..9 with values... the rest of the
          // gzip string is identical...
          byte[] expectedOutput2 = CryptoUnitUtils
                  .hexToBytes("1f8b0800000000000000f348cdc9c957700401050f8ad9949b80c40600bbec62509b000000");
          // since JDK 16, gzip call sets OS flag to 255, that means "unknown", previous versions set this byte to 0
          // see http://www.zlib.org/rfc-gzip.html spec for gzip header bytes details
          if(output2.length > 8 && output2[9] == -1) {
              output2[9] = 0;
          }
  
          assertArrayEquals(expectedOutput2, output2);
  
      }
  
  }
  