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18 package org.apache.hadoop.hbase.mapreduce;
19
20 import static org.apache.hadoop.hbase.security.visibility.VisibilityConstants.LABELS_TABLE_FAMILY;
21 import static org.apache.hadoop.hbase.security.visibility.VisibilityConstants.LABELS_TABLE_NAME;
22 import static org.apache.hadoop.hbase.security.visibility.VisibilityConstants.LABEL_QUALIFIER;
23
24 import java.io.IOException;
25 import java.util.HashMap;
26 import java.util.List;
27 import java.util.Map;
28
29 import org.apache.commons.logging.Log;
30 import org.apache.commons.logging.LogFactory;
31 import org.apache.hadoop.hbase.classification.InterfaceAudience;
32 import org.apache.hadoop.conf.Configuration;
33 import org.apache.hadoop.hbase.TableNotFoundException;
34 import org.apache.hadoop.hbase.Tag;
35 import org.apache.hadoop.hbase.client.HTable;
36 import org.apache.hadoop.hbase.client.Result;
37 import org.apache.hadoop.hbase.client.ResultScanner;
38 import org.apache.hadoop.hbase.client.Scan;
39 import org.apache.hadoop.hbase.security.visibility.Authorizations;
40 import org.apache.hadoop.hbase.security.visibility.VisibilityLabelOrdinalProvider;
41 import org.apache.hadoop.hbase.security.visibility.VisibilityUtils;
42 import org.apache.hadoop.hbase.util.Bytes;
43
44
45
46
47
48 @InterfaceAudience.Private
49 public class DefaultVisibilityExpressionResolver implements VisibilityExpressionResolver {
50 private static final Log LOG = LogFactory.getLog(DefaultVisibilityExpressionResolver.class);
51
52 private Configuration conf;
53 private final Map<String, Integer> labels = new HashMap<String, Integer>();
54
55 @Override
56 public Configuration getConf() {
57 return this.conf;
58 }
59
60 @Override
61 public void setConf(Configuration conf) {
62 this.conf = conf;
63 }
64
65 @Override
66 public void init() {
67
68
69 HTable labelsTable = null;
70 try {
71 labelsTable = new HTable(conf, LABELS_TABLE_NAME);
72 } catch (TableNotFoundException e) {
73
74
75 return;
76 } catch (IOException e) {
77 LOG.error("Error opening 'labels' table", e);
78 return;
79 }
80 Scan scan = new Scan();
81 scan.setAuthorizations(new Authorizations(VisibilityUtils.SYSTEM_LABEL));
82 scan.addColumn(LABELS_TABLE_FAMILY, LABEL_QUALIFIER);
83 ResultScanner scanner = null;
84 try {
85 scanner = labelsTable.getScanner(scan);
86 Result next = null;
87 while ((next = scanner.next()) != null) {
88 byte[] row = next.getRow();
89 byte[] value = next.getValue(LABELS_TABLE_FAMILY, LABEL_QUALIFIER);
90 labels.put(Bytes.toString(value), Bytes.toInt(row));
91 }
92 } catch (IOException e) {
93 LOG.error("Error reading 'labels' table", e);
94 } finally {
95 try {
96 if (scanner != null) {
97 scanner.close();
98 }
99 } finally {
100 try {
101 labelsTable.close();
102 } catch (IOException e) {
103 LOG.warn("Error on closing 'labels' table", e);
104 }
105 }
106 }
107 }
108
109 @Override
110 public List<Tag> createVisibilityExpTags(String visExpression) throws IOException {
111 VisibilityLabelOrdinalProvider provider = new VisibilityLabelOrdinalProvider() {
112 @Override
113 public int getLabelOrdinal(String label) {
114 return labels.get(label);
115 }
116
117 @Override
118 public String getLabel(int ordinal) {
119
120 throw new UnsupportedOperationException(
121 "getLabel should not be used in VisibilityExpressionResolver");
122 }
123 };
124 return VisibilityUtils.createVisibilityExpTags(visExpression, true, false, null, provider);
125 }
126 }