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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.hadoop.hbase.security.token;
20  
21  import java.util.Collection;
22  
23  import org.apache.commons.logging.Log;
24  import org.apache.commons.logging.LogFactory;
25  import org.apache.hadoop.hbase.classification.InterfaceAudience;
26  import org.apache.hadoop.io.Text;
27  import org.apache.hadoop.security.token.Token;
28  import org.apache.hadoop.security.token.TokenIdentifier;
29  import org.apache.hadoop.security.token.TokenSelector;
30  
31  @InterfaceAudience.Private
32  public class AuthenticationTokenSelector
33      implements TokenSelector<AuthenticationTokenIdentifier> {
34    private static Log LOG = LogFactory.getLog(AuthenticationTokenSelector.class);
35  
36    public AuthenticationTokenSelector() {
37    }
38  
39    @Override
40    public Token<AuthenticationTokenIdentifier> selectToken(Text serviceName,
41        Collection<Token<? extends TokenIdentifier>> tokens) {
42      if (serviceName != null) {
43        for (Token ident : tokens) {
44          if (serviceName.equals(ident.getService()) &&
45              AuthenticationTokenIdentifier.AUTH_TOKEN_TYPE.equals(ident.getKind())) {
46            if (LOG.isDebugEnabled()) {
47              LOG.debug("Returning token "+ident);
48            }
49            return (Token<AuthenticationTokenIdentifier>)ident;
50          }
51        }
52      }
53      LOG.debug("No matching token found");
54      return null;
55    }
56  }