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token_cache.h

/***************************************************************
 *
 * Copyright (C) 1990-2007, Condor Team, Computer Sciences Department,
 * University of Wisconsin-Madison, WI.
 * 
 * Licensed 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.
 *
 ***************************************************************/

#ifndef __TOKEN_CACHE_H
#define __TOKEN_CACHE_H

#ifdef WIN32

#include "condor_common.h"
#include "HashTable.h"
#include "MyString.h"

#define MAX_CACHE_SIZE 10           // maximum number of tokens to cache. This 
                                                // might be a config file knob one day.


/* define a couple data structures */

struct token_cache_entry {
      int age;
      HANDLE user_token;
};

typedef HashTable<MyString, token_cache_entry*> TokenHashTable;

/* This class manages our cached user tokens. */

class token_cache {
      public:
            token_cache();
            ~token_cache();

            HANDLE getToken(const char* username, const char* domain);
            bool storeToken(const char* username, const char* domain, 
                  const HANDLE token);
            MyString cacheToString();           
            
      private:

            /* Data Members */
            int current_age;
            TokenHashTable *TokenTable;
            
            /* helper functions */
            int getNextAge() { return current_age++; }
            void removeOldestToken();
            bool isOlder(int index, int olderIndex) { 
                  return ( index < olderIndex); 
            }
            int getCacheSize() { return TokenTable->getNumElements(); }
      
};

#endif // WIN32
#endif // __TOKEN_CACHE_H

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