| /* |
| * 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.web.oauth2; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.util.Timer; |
| |
| import static org.apache.hadoop.hdfs.web.oauth2.Utils.notNull; |
| |
| /** |
| * Obtain an access token via a a credential (provided through the |
| * Configuration) using the |
| * <a href="https://tools.ietf.org/html/rfc6749#section-4.4"> |
| * Client Credentials Grant workflow</a>. |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class ConfCredentialBasedAccessTokenProvider |
| extends CredentialBasedAccessTokenProvider { |
| private String credential; |
| |
| public ConfCredentialBasedAccessTokenProvider() { |
| } |
| |
| public ConfCredentialBasedAccessTokenProvider(Timer timer) { |
| super(timer); |
| } |
| |
| @Override |
| public void setConf(Configuration conf) { |
| super.setConf(conf); |
| credential = notNull(conf, OAUTH_CREDENTIAL_KEY); |
| } |
| |
| @Override |
| public String getCredential() { |
| if(credential == null) { |
| throw new IllegalArgumentException("Credential has not been " + |
| "provided in configuration"); |
| } |
| |
| return credential; |
| } |
| } |