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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.hadoop.hbase.security.visibility;
19  
20  import java.util.ArrayList;
21  import java.util.List;
22  
23  import org.apache.hadoop.hbase.classification.InterfaceAudience;
24  import org.apache.hadoop.conf.Configuration;
25  import org.apache.hadoop.hbase.security.User;
26  
27  // Strictly removes a specified label
28  @InterfaceAudience.Private
29  public class LabelFilteringScanLabelGenerator implements ScanLabelGenerator {
30  
31    public static String labelToFilter = null;
32  
33    @Override
34    public Configuration getConf() {
35      return null;
36    }
37  
38    @Override
39    public void setConf(Configuration conf) {
40  
41    }
42  
43    @Override
44    public List<String> getLabels(User user, Authorizations authorizations) {
45      if (authorizations != null) {
46        if (labelToFilter == null) return authorizations.getLabels();
47        List<String> newAuths = new ArrayList<String>();
48        for (String auth : authorizations.getLabels()) {
49          if (!labelToFilter.equals(auth)) newAuths.add(auth);
50        }
51        return newAuths;
52      }
53      return null;
54    }
55  }