/*
* 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.file;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.sentry.provider.common.GroupMappingService;
import org.apache.shiro.config.Ini;
import org.apache.shiro.config.Ini.Section;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Strings;
import com.google.common.collect.Lists;
/**
* Mapping users to groups
* parse the ini file with section [users] that contains the user names.
* For each user in that list, there's section that contains the group
* name for that user If there's no user section or no group section for
* one of users, then just print a warning and continue.
* Example -
* [users]
* usr1
* usr2
*
* [[usr1]
* group1
* group11
*
* [usr2]
* group21
* group22
*
*/
public class LocalGroupMappingService implements GroupMappingService {
private static final Logger LOGGER = LoggerFactory
.getLogger(LocalGroupMappingService.class);
private final Map <String, List<String>> groupMap =
new HashMap <String, List<String>> ();
public LocalGroupMappingService(Path resourcePath) throws IOException {
this(new Configuration(), resourcePath);
}
@VisibleForTesting
public LocalGroupMappingService(Configuration configuration, Path resourcePath) throws IOException {
// parse user/group mapping
parseGroups(resourcePath.getFileSystem(configuration), resourcePath);
}
@Override
public List<String> getGroups(String user) {
if (groupMap.containsKey(user)) {
return groupMap.get(user);
} else {
return Collections.emptyList();
}
}
private void parseGroups(FileSystem fileSystem, Path resourcePath) throws IOException {
Ini ini = PolicyFiles.loadFromPath(fileSystem, resourcePath);
Section usersSection = ini.getSection(PolicyFileConstants.USERS);
if (usersSection == null) {
LOGGER.warn("No section " + PolicyFileConstants.USERS + " in the " + resourcePath);
return;
}
for (Entry<String, String> userEntry : usersSection.entrySet()) {
String userName = Strings.nullToEmpty(userEntry.getKey()).trim();
String groupNames = Strings.nullToEmpty(userEntry.getValue()).trim();
if (userName.isEmpty()) {
LOGGER.error("Invalid user name in the " + resourcePath);
continue;
}
if (groupNames.isEmpty()) {
LOGGER.warn("No groups available for user " + userName +
" in the " + resourcePath);
continue;
}
List<String> groupList = Lists.newArrayList(
PolicyFileConstants.ROLE_SPLITTER.trimResults().split(groupNames));
LOGGER.debug("Got user mapping: " + userName + ", Groups: " + groupNames);
groupMap.put(userName, groupList);
}
}
}