/**
* 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.falcon.regression.core.util;
import org.apache.falcon.regression.core.enumsAndConstants.MerlinConstants;
import org.apache.hadoop.security.UserGroupInformation;
import java.io.IOException;
/**
* Util methods for Kerberos.
*/
public final class KerberosHelper {
private KerberosHelper() {
throw new AssertionError("Instantiating utility class...");
}
public static UserGroupInformation getUGI(String user) throws IOException {
// if unsecure cluster create a remote user object
if (!MerlinConstants.IS_SECURE) {
return UserGroupInformation.createRemoteUser(user);
}
// if secure create a ugi object from keytab
return UserGroupInformation.loginUserFromKeytabAndReturnUGI(getPrincipal(user),
getKeyTab(user));
}
private static String getKeyTab(String user) {
return MerlinConstants.getKeytabForUser(user);
}
private static String getPrincipal(String user) {
return MerlinConstants.USER_REALM.isEmpty() ? user : user + '@' + MerlinConstants
.USER_REALM;
}
}