/*
  Copyright (c) 2016, 2025, Oracle and/or its affiliates.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.

  This program is designed to work with certain software (including
  but not limited to OpenSSL) that is licensed under separate terms,
  as designated in a particular file or component or in included license
  documentation.  The authors of MySQL hereby grant you an additional
  permission to link the program and your derivative works with the
  separately licensed software that they have either included with
  the program or referenced in the documentation.

  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 General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef MYSQL_HARNESS_KEYRING_INCLUDED
#define MYSQL_HARNESS_KEYRING_INCLUDED

#include <stdexcept>
#include <string>
#include "harness_export.h"

namespace mysql_harness {

/**
 * Keyring interface.
 *
 * Keyrings are responsible for storage and retrieval of sensitive data
 * (such as login credentials).
 */
class HARNESS_EXPORT Keyring {
 public:
  explicit Keyring() = default;
  explicit Keyring(const Keyring &) = default;
  Keyring &operator=(const Keyring &) = default;
  virtual ~Keyring() = default;

  /**
   * Stores an attribute value in an entry.
   *
   * @param[in] uid Entry id.
   * @param[in] attribute Attribute id.
   * @param[in] value Attribute value.
   */
  virtual void store(const std::string &uid, const std::string &attribute,
                     const std::string &value) = 0;

  /**
   * Retrieves attribute value from an entry.
   *
   * @param[in] uid Entry id.
   * @param[in] attribute Attribute id.
   *
   * @return Attribute value.
   *
   * @exception std::out_of_range Attribute not found.
   */
  virtual std::string fetch(const std::string &uid,
                            const std::string &attribute) const = 0;

  /**
   * Removes an entry.
   *
   * @param[in] uid Entry id.
   *
   * @returns success
   * @retval true uid removed
   * @retval false uid not removed
   */
  virtual bool remove(const std::string &uid) = 0;

  /**
   * Removes an attribute from an entry.
   *
   * @param[in] uid Entry id.
   * @param[in] attribute Attribute id.
   *
   * @returns success
   * @retval true uid removed
   * @retval false uid not removed
   */
  virtual bool remove_attribute(const std::string &uid,
                                const std::string &attribute) = 0;
};

}  // namespace mysql_harness

#endif  // MYSQL_HARNESS_KEYRING_INCLUDED
