org.apache.sentry.provider.common.HadoopGroupMappingService.java Source code

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Here is the source code for org.apache.sentry.provider.common.HadoopGroupMappingService.java

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/*
 * 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.sentry.provider.common;

import java.io.IOException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.Groups;

import com.google.common.collect.Lists;
import org.apache.sentry.core.common.exception.SentryGroupNotFoundException;

public class HadoopGroupMappingService implements GroupMappingService {

    private static Configuration hadoopConf;
    private final Groups groups;

    public HadoopGroupMappingService(Groups groups) {
        this.groups = groups;
    }

    public HadoopGroupMappingService(Configuration conf, String resource) {
        if (hadoopConf == null) {
            synchronized (HadoopGroupMappingService.class) {
                if (hadoopConf == null) {
                    // clone the current config and add resource path
                    hadoopConf = new Configuration();
                    hadoopConf.addResource(conf);
                    if (!StringUtils.isEmpty(resource)) {
                        hadoopConf.addResource(resource, true);
                    }
                }
            }
        }
        this.groups = Groups.getUserToGroupsMappingService(hadoopConf);
    }

    @Override
    public Set<String> getGroups(String user) throws SentryGroupNotFoundException {
        List<String> groupList = Lists.newArrayList();
        try {
            groupList = groups.getGroups(user);
        } catch (IOException e) {
            throw new SentryGroupNotFoundException("Unable to obtain groups for " + user, e);
        }
        if (groupList == null || groupList.isEmpty()) {
            throw new SentryGroupNotFoundException("Unable to obtain groups for " + user);
        }
        return new HashSet<String>(groupList);
    }
}