/*************************************************************************
 * Copyright 2009-2014 Eucalyptus Systems, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 * Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
 * CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
 * additional information or have any questions.
 ************************************************************************/
package com.eucalyptus.imaging.manifest;

import com.eucalyptus.auth.Accounts;
import com.eucalyptus.auth.principal.AccountIdentifiers;
import com.eucalyptus.objectstorage.client.EucaS3Client;
import com.eucalyptus.objectstorage.client.EucaS3ClientFactory;
import com.eucalyptus.util.EucalyptusCloudException;

import java.util.concurrent.TimeUnit;

public enum BundleImageManifest implements ImageManifest {
  INSTANCE;

  @Override
  public FileType getFileType() {
    return FileType.BUNDLE;
  }

  @Override
  public String getPartsPath() {
    return "/manifest/image/parts/part";
  }

  @Override
  public String getPartUrlElement() {
    return "filename";
  }

  @Override
  public String getDigestElement() {
    return "digest";
  }

  @Override
  public boolean signPartUrl() {
    return true;
  }

  @Override
  public String getSizePath() {
    return "/manifest/image/bundled_size";
  }

  @Override
  public String getManifest(String location, int maximumSize)
      throws EucalyptusCloudException {
    String cleanLocation = location.replaceAll("^/*", "");
    int index = cleanLocation.indexOf('/');
    String bucketName = cleanLocation.substring(0, index);
    String manifestKey = cleanLocation.substring(index + 1);
    try (final EucaS3Client s3Client = EucaS3ClientFactory.getEucaS3ClientForUser(
        Accounts.lookupSystemAccountByAlias( AccountIdentifiers.AWS_EXEC_READ_SYSTEM_ACCOUNT ),
        (int)TimeUnit.MINUTES.toSeconds( 15 ))) {
      return s3Client.getObjectContent(bucketName, manifestKey, maximumSize);
    } catch (Exception e) {
      throw new EucalyptusCloudException("Failed to read manifest file: "
          + bucketName + "/" + manifestKey, e);
    }
  }

  @Override
  public String getBaseBucket(String location) {
    String cleanLocation = location.replaceAll("^/*", "");
    int index = cleanLocation.indexOf('/');
    return cleanLocation.substring(0, index);
  }
}