001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.hbase.security.token;
020
021import java.util.Collection;
022
023import org.apache.yetus.audience.InterfaceAudience;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026import org.apache.hadoop.io.Text;
027import org.apache.hadoop.security.token.Token;
028import org.apache.hadoop.security.token.TokenIdentifier;
029import org.apache.hadoop.security.token.TokenSelector;
030
031@InterfaceAudience.Private
032public class AuthenticationTokenSelector
033    implements TokenSelector<AuthenticationTokenIdentifier> {
034  private static final Logger LOG = LoggerFactory.getLogger(AuthenticationTokenSelector.class);
035
036  public AuthenticationTokenSelector() {
037  }
038
039  @Override
040  public Token<AuthenticationTokenIdentifier> selectToken(Text serviceName,
041      Collection<Token<? extends TokenIdentifier>> tokens) {
042    if (serviceName != null) {
043      for (Token ident : tokens) {
044        if (serviceName.equals(ident.getService()) &&
045            AuthenticationTokenIdentifier.AUTH_TOKEN_TYPE.equals(ident.getKind())) {
046          if (LOG.isDebugEnabled()) {
047            LOG.debug("Returning token "+ident);
048          }
049          return (Token<AuthenticationTokenIdentifier>)ident;
050        }
051      }
052    }
053    LOG.debug("No matching token found");
054    return null;
055  }
056}