| /** |
| * 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.hdfs.security.token.delegation; |
| |
| import java.net.URI; |
| import java.util.Collection; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.net.NetUtils; |
| import org.apache.hadoop.security.SecurityUtil; |
| import org.apache.hadoop.security.token.Token; |
| import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSelector; |
| |
| /** |
| * A delegation token that is specialized for HDFS |
| */ |
| @InterfaceAudience.Private |
| public class DelegationTokenSelector |
| extends AbstractDelegationTokenSelector<DelegationTokenIdentifier>{ |
| public static final String SERVICE_NAME_KEY = "hdfs.service.host_"; |
| |
| /** |
| * Select the delegation token for hdfs. The port will be rewritten to |
| * the port of hdfs.service.host_$nnAddr, or the default rpc namenode port. |
| * This method should only be called by non-hdfs filesystems that do not |
| * use the rpc port to acquire tokens. Ex. webhdfs, hftp |
| * @param nnUri of the remote namenode |
| * @param tokens as a collection |
| * @param conf hadoop configuration |
| * @return Token |
| */ |
| public Token<DelegationTokenIdentifier> selectToken( |
| final URI nnUri, Collection<Token<?>> tokens, |
| final Configuration conf) { |
| // this guesses the remote cluster's rpc service port. |
| // the current token design assumes it's the same as the local cluster's |
| // rpc port unless a config key is set. there should be a way to automatic |
| // and correctly determine the value |
| Text serviceName = SecurityUtil.buildTokenService(nnUri); |
| final String nnServiceName = conf.get(SERVICE_NAME_KEY + serviceName); |
| |
| int nnRpcPort = HdfsClientConfigKeys.DFS_NAMENODE_RPC_PORT_DEFAULT; |
| if (nnServiceName != null) { |
| nnRpcPort = NetUtils.createSocketAddr(nnServiceName, nnRpcPort).getPort(); |
| } |
| // use original hostname from the uri to avoid unintentional host resolving |
| serviceName = SecurityUtil.buildTokenService( |
| NetUtils.createSocketAddrForHost(nnUri.getHost(), nnRpcPort)); |
| |
| return selectToken(serviceName, tokens); |
| } |
| |
| public DelegationTokenSelector() { |
| super(DelegationTokenIdentifier.HDFS_DELEGATION_KIND); |
| } |
| } |