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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.List;
21  
22  import org.apache.commons.logging.Log;
23  import org.apache.commons.logging.LogFactory;
24  import org.apache.hadoop.hbase.classification.InterfaceAudience;
25  import org.apache.hadoop.conf.Configuration;
26  import org.apache.hadoop.hbase.security.User;
27  
28  /**
29   * If the passed in authorization is null, then this ScanLabelGenerator
30   * feeds the set of predefined authorization labels for the given user. That is
31   * the set defined by the admin using the VisibilityClient admin interface
32   * or the set_auths shell command.
33   * Otherwise the passed in authorization labels are returned with no change.
34   *
35   * Note: This SLG should not be used alone because it does not check
36   * the passed in authorization labels against what the user is authorized for.
37   */
38  @InterfaceAudience.Private
39  public class FeedUserAuthScanLabelGenerator implements ScanLabelGenerator {
40  
41    private static final Log LOG = LogFactory.getLog(FeedUserAuthScanLabelGenerator.class);
42  
43    private Configuration conf;
44    private VisibilityLabelsCache labelsCache;
45  
46    public FeedUserAuthScanLabelGenerator() {
47      this.labelsCache = VisibilityLabelsCache.get();
48    }
49  
50    @Override
51    public void setConf(Configuration conf) {
52      this.conf = conf;
53    }
54  
55    @Override
56    public Configuration getConf() {
57      return this.conf;
58    }
59  
60    @Override
61    public List<String> getLabels(User user, Authorizations authorizations) {
62      if (authorizations == null || authorizations.getLabels() == null
63          || authorizations.getLabels().isEmpty()) {
64        String userName = user.getShortName();
65        return this.labelsCache.getAuths(userName);
66      }
67      return authorizations.getLabels();
68    }
69  
70  }