#ifndef _VALIDATOR_H
 #define _VALIDATOR_H

 
 #include <string>

 #include <memory>

 #include "user.h"

 #include "token.h"

 class validator_ifc
 {
 public:
     virtual ~validator_ifc() {}

     virtual bool validate (const std::string &user_name,
                            const std::string &token)

     {
         return false;
     }

 };
 

 class validator : public validator_ifc
 {
 private:
     std::shared_ptr<validator_ifc> delegate_;
 public:

     validator (const std::shared_ptr<validator_ifc> &delegate) : delegate_
         (delegate) {}
     validator() : validator (std::shared_ptr<validator_ifc>
                                  (new validator_ifc)) {}
     bool validate (const std::string &user_name, const std::string &token)

     {

         return delegate_->validate (user_name, token);

     }

 };

 validator create_validator (const directory &directory,
                             const user_token_supplier_p &token_supplier);

 
 #endif