/**
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.hadoop.hbase.mapreduce;
import static org.apache.hadoop.hbase.security.visibility.VisibilityConstants.LABELS_TABLE_FAMILY;
import static org.apache.hadoop.hbase.security.visibility.VisibilityConstants.LABELS_TABLE_NAME;
import static org.apache.hadoop.hbase.security.visibility.VisibilityConstants.LABEL_QUALIFIER;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.TableNotFoundException;
import org.apache.hadoop.hbase.Tag;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.security.visibility.Authorizations;
import org.apache.hadoop.hbase.security.visibility.VisibilityLabelOrdinalProvider;
import org.apache.hadoop.hbase.security.visibility.VisibilityUtils;
import org.apache.hadoop.hbase.util.Bytes;
/**
* This implementation creates tags by expanding expression using label ordinal. Labels will be
* serialized in sorted order of it's ordinal.
*/
@InterfaceAudience.Private
public class DefaultVisibilityExpressionResolver implements VisibilityExpressionResolver {
private static final Log LOG = LogFactory.getLog(DefaultVisibilityExpressionResolver.class);
private Configuration conf;
private final Map<String, Integer> labels = new HashMap<String, Integer>();
@Override
public Configuration getConf() {
return this.conf;
}
@Override
public void setConf(Configuration conf) {
this.conf = conf;
}
@Override
public void init() {
// Reading all the labels and ordinal.
// This scan should be done by user with global_admin previliges.. Ensure that it works
Table labelsTable = null;
try {
labelsTable = new HTable(conf, LABELS_TABLE_NAME);
} catch (TableNotFoundException e) {
// Just return with out doing any thing. When the VC is not used we wont be having 'labels'
// table in the cluster.
return;
} catch (IOException e) {
LOG.error("Error opening 'labels' table", e);
return;
}
Scan scan = new Scan();
scan.setAuthorizations(new Authorizations(VisibilityUtils.SYSTEM_LABEL));
scan.addColumn(LABELS_TABLE_FAMILY, LABEL_QUALIFIER);
ResultScanner scanner = null;
try {
scanner = labelsTable.getScanner(scan);
Result next = null;
while ((next = scanner.next()) != null) {
byte[] row = next.getRow();
byte[] value = next.getValue(LABELS_TABLE_FAMILY, LABEL_QUALIFIER);
labels.put(Bytes.toString(value), Bytes.toInt(row));
}
} catch (IOException e) {
LOG.error("Error reading 'labels' table", e);
} finally {
try {
if (scanner != null) {
scanner.close();
}
} finally {
try {
labelsTable.close();
} catch (IOException e) {
LOG.warn("Error on closing 'labels' table", e);
}
}
}
}
@Override
public List<Tag> createVisibilityExpTags(String visExpression) throws IOException {
VisibilityLabelOrdinalProvider provider = new VisibilityLabelOrdinalProvider() {
@Override
public int getLabelOrdinal(String label) {
return labels.get(label);
}
};
return VisibilityUtils.createVisibilityExpTags(visExpression, true, false, null, provider);
}
}