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/*
 *    Copyright (C) 2014 MongoDB Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#pragma once

#include <string>

#include "mongo/base/disallow_copying.h"
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/db/auth/sasl_authentication_session.h"
#include "mongo/db/auth/user.h"

namespace mongo {
    
    class SaslAuthenticationSession;
    template <typename T> class StatusWith;
    
    /**
     * Abstract class for implementing the server-side
     * of a SASL mechanism conversation.
     */
    class SaslServerConversation {
        MONGO_DISALLOW_COPYING(SaslServerConversation);
    public:
        /**
         * Implements the server side of a SASL authentication mechanism.
         *
         * "saslAuthSession" is the corresponding SASLAuthenticationSession.
         * "saslAuthSession" must stay in scope until the SaslServerConversation's 
         *  destructor completes.
         * 
         **/
        explicit SaslServerConversation(SaslAuthenticationSession* saslAuthSession) :
            _saslAuthSession(saslAuthSession),
            _user("") {}

        virtual ~SaslServerConversation();

        /**
         * Performs one step of the server side of the authentication session,
         * consuming "inputData" and producing "*outputData".
         *
         * A return of Status::OK() indicates successful progress towards authentication. 
         * A return of !Status::OK() indicates failed authentication
         *
         * A return of true means that the authentication process has finished.
         * A return of false means that the authentication process has more steps.
         *
         */
        virtual StatusWith<bool> step(StringData inputData, std::string* outputData) = 0;

        /**
         * Gets the SASL principal id (user name) for the conversation
         **/
        std::string getPrincipalId();
    
    protected:
        SaslAuthenticationSession* _saslAuthSession;
        std::string _user;
    };

}  // namespace mongo