/**
 * 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.security;
import static org.junit.Assume.assumeTrue;
import static org.junit.Assert.*;

import java.util.Arrays;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;

import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.apache.hadoop.security.GroupMappingServiceProvider;
import org.apache.hadoop.security.JniBasedUnixGroupsMapping;
import org.apache.hadoop.security.ShellBasedUnixGroupsMapping;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.NativeCodeLoader;
import org.apache.hadoop.util.ReflectionUtils;
import org.junit.Before;
import org.junit.Test;


public class TestJNIGroupsMapping {
  
  @Before
  public void isNativeCodeLoaded() {
    assumeTrue(NativeCodeLoader.isNativeCodeLoaded());
  }
  
  @Test
  public void testJNIGroupsMapping() throws Exception {
    //for the user running the test, check whether the 
    //ShellBasedUnixGroupsMapping and the JniBasedUnixGroupsMapping
    //return the same groups
    String user = UserGroupInformation.getCurrentUser().getShortUserName();
    testForUser(user);
    //check for a dummy non-existent user (both the implementations should
    //return an empty list
    testForUser("fooBarBaz1234DoesNotExist");
  }
  private void testForUser(String user) throws Exception {
    GroupMappingServiceProvider g = new ShellBasedUnixGroupsMapping();
    List<String> shellBasedGroups = g.getGroups(user);
    g = new JniBasedUnixGroupsMapping();
    List<String> jniBasedGroups = g.getGroups(user);
    
    String[] shellBasedGroupsArray = shellBasedGroups.toArray(new String[0]);
    Arrays.sort(shellBasedGroupsArray);
    String[] jniBasedGroupsArray = jniBasedGroups.toArray(new String[0]);
    Arrays.sort(jniBasedGroupsArray);
    
    if (!Arrays.equals(shellBasedGroupsArray, jniBasedGroupsArray)) {
      fail("Groups returned by " + 
          ShellBasedUnixGroupsMapping.class.getCanonicalName() + 
          " and " +
          JniBasedUnixGroupsMapping.class.getCanonicalName() + 
          " didn't match for " + user);
    }
  }
}