content: /*
   * Licensed 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 io.airlift.secrets.keystore;
  
  import com.google.inject.Inject;
  import io.airlift.spi.secrets.SecretProvider;
  
  import javax.crypto.SecretKeyFactory;
  import javax.crypto.spec.PBEKeySpec;
  
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.security.GeneralSecurityException;
  import java.security.KeyStore;
  
  public class KeystoreSecretProvider
          implements SecretProvider
  {
      private final KeyStore keyStore;
      private final char[] keystorePassword;
  
      @Inject
      public KeystoreSecretProvider(KeystoreSecretProviderConfig config)
              throws GeneralSecurityException, IOException
      {
          keystorePassword = config.getKeyStorePassword().toCharArray();
          keyStore = KeyStore.getInstance(config.getKeyStoreType());
          keyStore.load(new FileInputStream(config.getKeyStoreFilePath()), keystorePassword);
      }
  
      @Override
      public String resolveSecretValue(String key)
      {
          try {
              KeyStore.SecretKeyEntry secretKeyEntry = (KeyStore.SecretKeyEntry) keyStore.getEntry(key, new KeyStore.PasswordProtection(keystorePassword));
  
              if (secretKeyEntry == null) {
                  throw new RuntimeException("Key not found in keystore: " + key);
              }
              SecretKeyFactory factory = SecretKeyFactory.getInstance("PBE");
              PBEKeySpec keySpec = (PBEKeySpec) factory.getKeySpec(secretKeyEntry.getSecretKey(), PBEKeySpec.class);
              return new String(keySpec.getPassword());
          }
          catch (GeneralSecurityException e) {
              throw new RuntimeException(e);
          }
      }
  }
  