content: /**
   * 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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.notification.preprocessor;
  
  import org.apache.atlas.model.instance.AtlasEntity;
  import org.apache.commons.lang.StringUtils;
  import org.apache.hadoop.fs.Path;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class AWSS3V2Preprocessor {
      private static final Logger LOG = LoggerFactory.getLogger(AWSS3V2Preprocessor.class);
  
      private static final String AWS_S3_V2_DIR_TYPE      = "aws_s3_v2_directory";
      private static final String ATTRIBUTE_OBJECT_PREFIX = "objectPrefix";
      private static final String SCHEME_SEPARATOR        = "://";
  
      static class AWSS3V2DirectoryPreprocessor extends EntityPreprocessor {
          protected AWSS3V2DirectoryPreprocessor() {
              super(AWS_S3_V2_DIR_TYPE);
          }
  
          @Override
          public void preprocess(AtlasEntity entity, PreprocessorContext context) {
              if (context.getS3V2DirectoryPruneObjectPrefix()) {
                  String qualifiedName = (String) entity.getAttribute(ATTRIBUTE_QUALIFIED_NAME);
                  String objectPrefix  = (String) entity.getAttribute(ATTRIBUTE_OBJECT_PREFIX);
  
                  if (isObjectPrefixPruneNeeded(qualifiedName, objectPrefix)) {
                      if (objectPrefix.lastIndexOf(Path.SEPARATOR) == -1) {
                          objectPrefix = Path.SEPARATOR;
                      } else {
                          if (doesEndsWithPathSeparator(objectPrefix)) {
                              objectPrefix = removeLastPathSeparator(objectPrefix);
                          }
  
                          objectPrefix = objectPrefix.substring(0, objectPrefix.lastIndexOf(Path.SEPARATOR) + 1);
                      }
  
                      LOG.info("Aws S3 V2 Preprocessor: Pruning {} from {} to {}", ATTRIBUTE_OBJECT_PREFIX + QNAME_SEP_CLUSTER_NAME + AWS_S3_V2_DIR_TYPE, entity.getAttribute(ATTRIBUTE_OBJECT_PREFIX), objectPrefix);
  
                      entity.setAttribute(ATTRIBUTE_OBJECT_PREFIX, objectPrefix);
                  }
              }
          }
  
          private boolean isObjectPrefixPruneNeeded(String qualifiedName, String objectPrefix) {
              return StringUtils.isNotBlank(qualifiedName) && StringUtils.isNotBlank(objectPrefix) && qualifiedName.contains(getSchemeAndBucket(qualifiedName) + objectPrefix + QNAME_SEP_CLUSTER_NAME);
          }
  
          private String getSchemeAndBucket(String qualifiedName) {
              String ret = "";
  
              if (StringUtils.isNotEmpty(qualifiedName) && qualifiedName.contains(SCHEME_SEPARATOR)) {
                  int schemeSeparatorEndPosition = qualifiedName.indexOf(SCHEME_SEPARATOR) + SCHEME_SEPARATOR.length();
                  int bucketEndPosition          = qualifiedName.indexOf(Path.SEPARATOR, schemeSeparatorEndPosition);
  
                  ret = qualifiedName.substring(0, bucketEndPosition);
              }
  
              return ret;
          }
  
          private boolean doesEndsWithPathSeparator(String path) {
              return path.endsWith(Path.SEPARATOR);
          }
  
          private String removeLastPathSeparator(String path) {
              return StringUtils.chop(path);
          }
      }
  }
  