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
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * 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.ambari.server.security.encryption;
  
  import java.io.IOException;
  import java.io.UncheckedIOException;
  import java.io.UnsupportedEncodingException;
  import java.nio.charset.StandardCharsets;
  
  import jakarta.inject.Inject;
  
  import org.apache.ambari.server.configuration.Configuration;
  import org.apache.ambari.server.utils.TextEncoding;
  import org.apache.commons.codec.DecoderException;
  import org.apache.commons.codec.binary.Base64;
  import org.apache.commons.codec.binary.Hex;
  
  import com.google.common.cache.Cache;
  import com.google.common.cache.CacheBuilder;
  import com.google.inject.Singleton;
  
  @Singleton
  public class AESEncryptionService implements EncryptionService {
  
    private static final String ENCODED_TEXT_FIELD_DELIMITER = "::";
    private static final String UTF_8_CHARSET = StandardCharsets.UTF_8.name();
  
    private final Cache<String, AESEncryptor> aesEncryptorCache = CacheBuilder.newBuilder().build();
  
    private MasterKeyService environmentMasterKeyService;
  
    @Inject
    private Configuration configuration;
  
    @Override
    public String encrypt(String toBeEncrypted) {
      return encrypt(toBeEncrypted, TextEncoding.BASE_64);
    }
  
    @Override
    public String encrypt(String toBeEncrypted, TextEncoding textEncoding) {
      return encrypt(toBeEncrypted, getAmbariMasterKey(), textEncoding);
    }
  
    @Override
    public String encrypt(String toBeEncrypted, String key) {
      return encrypt(toBeEncrypted, key, TextEncoding.BASE_64);
    }
  
    @Override
    public String encrypt(String toBeEncrypted, String key, TextEncoding textEncoding) {
      try {
        final EncryptionResult encryptionResult = getAesEncryptor(key).encrypt(toBeEncrypted);
        return TextEncoding.BASE_64 == textEncoding ? encodeEncryptionResultBase64(encryptionResult) : encodeEncryptionResultBinHex(encryptionResult);
      } catch (IOException e) {
        throw new UncheckedIOException(e);
      }
    }
  
    private AESEncryptor getAesEncryptor(String key) {
      AESEncryptor aesEncryptor = aesEncryptorCache.getIfPresent(key);
      if (aesEncryptor == null) {
        aesEncryptor = new AESEncryptor(key);
        aesEncryptorCache.put(key, aesEncryptor);
      }
  
      return aesEncryptor;
    }
  
    @Override
    public final String getAmbariMasterKey() {
      initEnvironmentMasterKeyService();
      return String.valueOf(environmentMasterKeyService.getMasterSecret());
    }
  
    private void initEnvironmentMasterKeyService() {
      if (environmentMasterKeyService == null) {
        environmentMasterKeyService = new MasterKeyServiceImpl(configuration);
        if (!environmentMasterKeyService.isMasterKeyInitialized()) {
          throw new SecurityException("You are trying to use a persisted master key but its initialization has been failed!");
        }
      }
    }
  
    private String encodeEncryptionResultBase64(EncryptionResult encryptionResult) throws UnsupportedEncodingException {
      return Base64.encodeBase64String((Base64.encodeBase64String(encryptionResult.salt) + ENCODED_TEXT_FIELD_DELIMITER + Base64.encodeBase64String(encryptionResult.iv)
          + ENCODED_TEXT_FIELD_DELIMITER + Base64.encodeBase64String(encryptionResult.cipher)).getBytes(UTF_8_CHARSET));
    }
  
    private String encodeEncryptionResultBinHex(EncryptionResult encryptionResult) throws UnsupportedEncodingException {
      return Hex.encodeHexString((Hex.encodeHexString(encryptionResult.salt) + ENCODED_TEXT_FIELD_DELIMITER + Hex.encodeHexString(encryptionResult.iv)
          + ENCODED_TEXT_FIELD_DELIMITER + Hex.encodeHexString(encryptionResult.cipher)).getBytes(UTF_8_CHARSET));
    }
  
    @Override
    public String decrypt(String toBeDecrypted) {
      return decrypt(toBeDecrypted, TextEncoding.BASE_64);
    }
  
    @Override
    public String decrypt(String toBeDecrypted, TextEncoding textEncoding) {
      return decrypt(toBeDecrypted, getAmbariMasterKey(), textEncoding);
    }
  
    @Override
    public String decrypt(String toBeDecrypted, String key) {
      return decrypt(toBeDecrypted, key, TextEncoding.BASE_64);
    }
  
    @Override
    public String decrypt(String toBeDecrypted, String key, TextEncoding textEncoding) {
      try {
        final byte[] decodedValue = TextEncoding.BASE_64 == textEncoding ? Base64.decodeBase64(toBeDecrypted) : Hex.decodeHex(toBeDecrypted.toCharArray());
        final String decodedText = new String(decodedValue, UTF_8_CHARSET);
        final String[] decodedParts = decodedText.split(ENCODED_TEXT_FIELD_DELIMITER);
        final AESEncryptor aes = getAesEncryptor(key);
        if (TextEncoding.BASE_64 == textEncoding) {
          return new String(aes.decrypt(Base64.decodeBase64(decodedParts[0]), Base64.decodeBase64(decodedParts[1]), Base64.decodeBase64(decodedParts[2])), UTF_8_CHARSET);
        } else {
          return new String(
            aes.decrypt(Hex.decodeHex(decodedParts[0].toCharArray()), Hex.decodeHex(decodedParts[1].toCharArray()), Hex.decodeHex(decodedParts[2].toCharArray())),
            UTF_8_CHARSET);
        }
      } catch (IOException e) {
        throw new UncheckedIOException(e);
      } catch (DecoderException e) {
        throw new RuntimeException(e);
      }
    }
  }
  