/*
 * 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.io.crypto;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.Key;
import java.util.Arrays;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.io.crypto.aes.AES;
import org.apache.hadoop.hbase.testclassification.MiscTests;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category({MiscTests.class, SmallTests.class})
public class TestCipherProvider {

  public static class MyCipherProvider implements CipherProvider {
    private Configuration conf;
    @Override
    public Configuration getConf() {
      return conf;
    }

    @Override
    public void setConf(Configuration conf) {
      this.conf = conf;
    }

    @Override
    public String getName() {
      return MyCipherProvider.class.getName();
    }

    @Override
    public String[] getSupportedCiphers() {
      return new String[] { "TEST" };
    }

    @Override
    public Cipher getCipher(String name) {
      if (name.equals("TEST")) {
        return new Cipher(this) {
          @Override
          public String getName() {
            return "TEST";
          }

          @Override
          public int getKeyLength() {
            return 0;
          }

          @Override
          public int getIvLength() {
            return 0;
          }

          @Override
          public Key getRandomKey() {
            return null;
          }

          @Override
          public Encryptor getEncryptor() {
            return null;
          }

          @Override
          public Decryptor getDecryptor() {
            return null;
          }

          @Override
          public OutputStream createEncryptionStream(OutputStream out, Context context, byte[] iv)
              throws IOException {
            return null;
          }

          @Override
          public OutputStream createEncryptionStream(OutputStream out, Encryptor encryptor)
              throws IOException {
            return null;
          }

          @Override
          public InputStream createDecryptionStream(InputStream in, Context context, byte[] iv)
              throws IOException {
            return null;
          }

          @Override
          public InputStream createDecryptionStream(InputStream in, Decryptor decryptor)
              throws IOException {
            return null;
          }
        };
      }
      return null;
    }
  }

  @Test
  public void testCustomProvider() {
    Configuration conf = HBaseConfiguration.create();
    conf.set(HConstants.CRYPTO_CIPHERPROVIDER_CONF_KEY, MyCipherProvider.class.getName());
    CipherProvider provider = Encryption.getCipherProvider(conf);
    assertTrue(provider instanceof MyCipherProvider);
    assertTrue(Arrays.asList(provider.getSupportedCiphers()).contains("TEST"));
    Cipher a = Encryption.getCipher(conf, "TEST");
    assertNotNull(a);
    assertTrue(a.getProvider() instanceof MyCipherProvider);
    assertEquals(a.getName(), "TEST");
    assertEquals(a.getKeyLength(), 0);
  }

  @Test
  public void testDefaultProvider() {
    Configuration conf = HBaseConfiguration.create();
    CipherProvider provider = Encryption.getCipherProvider(conf);
    assertTrue(provider instanceof DefaultCipherProvider);
    String algorithm =
        conf.get(HConstants.CRYPTO_KEY_ALGORITHM_CONF_KEY, HConstants.CIPHER_AES);
    assertTrue(Arrays.asList(provider.getSupportedCiphers()).contains(algorithm));
    Cipher a = Encryption.getCipher(conf, algorithm);
    assertNotNull(a);
    assertTrue(a.getProvider() instanceof DefaultCipherProvider);
    assertEquals(a.getName(), algorithm);
    assertEquals(a.getKeyLength(), AES.KEY_LENGTH);
  }

}