View Javadoc

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 org.apache.commons.logging.Log;
22  import org.apache.commons.logging.LogFactory;
23  import org.apache.hadoop.io.Text;
24  import org.apache.hadoop.security.token.Token;
25  import org.apache.hadoop.security.token.TokenIdentifier;
26  import org.apache.hadoop.security.token.TokenSelector;
27  
28  import java.util.Collection;
29  
30  public class AuthenticationTokenSelector
31      implements TokenSelector<AuthenticationTokenIdentifier> {
32    private static Log LOG = LogFactory.getLog(AuthenticationTokenSelector.class);
33  
34    public AuthenticationTokenSelector() {
35    }
36  
37    @Override
38    public Token<AuthenticationTokenIdentifier> selectToken(Text serviceName,
39        Collection<Token<? extends TokenIdentifier>> tokens) {
40      if (serviceName != null) {
41        for (Token ident : tokens) {
42          if (serviceName.equals(ident.getService()) &&
43              AuthenticationTokenIdentifier.AUTH_TOKEN_TYPE.equals(ident.getKind())) {
44            if (LOG.isDebugEnabled()) {
45              LOG.debug("Returning token "+ident);
46            }
47            return (Token<AuthenticationTokenIdentifier>)ident;
48          }
49        }
50      }
51      LOG.debug("No matching token found");
52      return null;
53    }
54  }