content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.underfs.swift;
  
  import alluxio.AlluxioURI;
  import alluxio.Constants;
  import alluxio.conf.PropertyKey;
  import alluxio.underfs.UnderFileSystem;
  import alluxio.underfs.UnderFileSystemConfiguration;
  import alluxio.underfs.UnderFileSystemFactory;
  
  import com.google.common.base.Preconditions;
  import com.google.common.base.Throwables;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * Factory for creating {@link SwiftUnderFileSystem}.
   */
  @ThreadSafe
  public class SwiftUnderFileSystemFactory implements UnderFileSystemFactory {
    private static final Logger LOG = LoggerFactory.getLogger(SwiftUnderFileSystemFactory.class);
  
    /**
     * Constructs a new {@link SwiftUnderFileSystemFactory}.
     */
    public SwiftUnderFileSystemFactory() {}
  
    @Override
    public UnderFileSystem create(String path, UnderFileSystemConfiguration conf) {
      Preconditions.checkNotNull(path, "path");
  
      if (checkSwiftCredentials(conf)) {
        try {
          return new SwiftUnderFileSystem(new AlluxioURI(path), conf);
        } catch (Exception e) {
          throw Throwables.propagate(e);
        }
      }
  
      String err = "Swift Credentials not available, cannot create Swift Under File System.";
      throw Throwables.propagate(new IOException(err));
    }
  
    @Override
    public boolean supportsPath(String path) {
      return path != null && path.startsWith(Constants.HEADER_SWIFT);
    }
  
    /**
     * @param conf optional configuration object for the UFS
     *
     * @return true if simulation mode or if all required authentication credentials are present
     */
    private boolean checkSwiftCredentials(UnderFileSystemConfiguration conf) {
      // We do not need authentication credentials in simulation mode
      if (conf.isSet(PropertyKey.SWIFT_SIMULATION)
          && conf.getBoolean(PropertyKey.SWIFT_SIMULATION)) {
        return true;
      }
  
      // Check if required credentials exist
      return conf.isSet(PropertyKey.SWIFT_PASSWORD_KEY)
          && conf.isSet(PropertyKey.SWIFT_TENANT_KEY)
          && conf.isSet(PropertyKey.SWIFT_AUTH_URL_KEY)
          && conf.isSet(PropertyKey.SWIFT_USER_KEY);
    }
  }
  