Java tutorial
/** * 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.sqoop.security.authorization; import org.apache.hadoop.security.UserGroupInformation; import org.apache.hadoop.security.token.delegation.web.HttpUserGroupInformation; import org.apache.sqoop.common.SqoopException; import org.apache.sqoop.security.AuthenticationProvider; import org.apache.sqoop.security.SecurityError; public class DefaultAuthenticationProvider extends AuthenticationProvider { @Override public String[] getGroupNames() { return getRemoteUGI().getGroupNames(); } @Override public String getUserName() { return getRemoteUGI().getShortUserName(); } private UserGroupInformation getRemoteUGI() { UserGroupInformation ugi = null; try { ugi = HttpUserGroupInformation.get(); } catch (Exception e) { throw new SqoopException(SecurityError.AUTH_0011, "Unable to get remote authentication from http request", e); } if (ugi == null) { throw new SqoopException(SecurityError.AUTH_0011, "Unable to get remote authentication from http request"); } return ugi; } }