/*************************************************************************
 * 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.objectstorage.policy;

import java.util.Collections;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import net.sf.json.JSONException;

import com.eucalyptus.auth.policy.ern.Ern;
import com.eucalyptus.auth.policy.ern.ServiceErnBuilder;

/**
 *
 */
public class S3ErnBuilder extends ServiceErnBuilder {

  public static final Pattern RESOURCE_PATTERN = Pattern.compile("([^\\s/]+)(?:(/\\S+))?");

  public static final int ARN_PATTERNGROUP_S3_BUCKET = 1;
  public static final int ARN_PATTERNGROUP_S3_OBJECT = 2;

  public S3ErnBuilder() {
    super(Collections.singleton("s3"));
  }

  @Override
  public Ern build(final String ern, final String service, final String region, final String account, final String resource) throws JSONException {
    final Matcher matcher = RESOURCE_PATTERN.matcher(resource);
    if (matcher.matches()) {
      String bucket = matcher.group(ARN_PATTERNGROUP_S3_BUCKET);
      String object = matcher.group(ARN_PATTERNGROUP_S3_OBJECT);
      return new S3ResourceName(account, bucket, object);
    }
    throw new JSONException("'" + ern + "' is not a valid ARN");
  }
}