/**
 * 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.security.alias;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;

import java.io.IOException;
import java.net.URI;

/**
 * CredentialProvider based on Java's KeyStore file format. The file may be
 * stored in any Hadoop FileSystem using the following name mangling:
 * jceks://hdfs@nn1.example.com/my/creds.jceks {@literal ->}
 * hdfs://nn1.example.com/my/creds.jceks jceks://file/home/larry/creds.jceks
 * {@literal ->} file:///home/larry/creds.jceks
 */
@InterfaceAudience.Private
public final class JavaKeyStoreProvider extends KeyStoreProvider {
  public static final String SCHEME_NAME = "jceks";
  public static final String KEYSTORE_TYPE = "jceks";
  public static final String ALGORITHM = "AES";

  private JavaKeyStoreProvider(URI uri, Configuration conf)
      throws IOException {
    super(uri, conf);
  }

  @Override
  protected String getSchemeName() {
    return SCHEME_NAME;
  }

  @Override
  protected String getKeyStoreType() {
    return KEYSTORE_TYPE;
  }

  @Override
  protected String getAlgorithm() {
    return ALGORITHM;
  }

  /**
   * The factory to create JksProviders, which is used by the ServiceLoader.
   */
  public static class Factory extends CredentialProviderFactory {
    @Override
    public CredentialProvider createProvider(URI providerName,
        Configuration conf) throws IOException {
      if (SCHEME_NAME.equals(providerName.getScheme())) {
        return new JavaKeyStoreProvider(providerName, conf);
      }
      return null;
    }
  }
}
