keyring_keys_metadata_iterator.h

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/* Copyright (c) 2021, 2024, 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
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as designated in a particular file or component or in included license
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permission to link the program and your derivative works with the
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This program is distributed in the hope that it will be useful,
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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You should have received a copy of the GNU General Public License
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef KEYRING_FORWARD_ITERATOR_INCLUDED
#define KEYRING_FORWARD_ITERATOR_INCLUDED
 
#include <mysql/components/service.h>
 
DEFINE_SERVICE_HANDLE(my_h_keyring_keys_metadata_iterator);
 
/**
  @ingroup group_keyring_component_services_inventory
 
  Keyring keys metadata iterator service provides APIs to create and use
  iterator to access metadata associated with all keys stored in keyring.
 
  @code
  bool print_keys_metadata() {
    char data_id[KEYRING_ITEM_BUFFER_SIZE] = "\0";
    char auth_id[KEYRING_ITEM_BUFFER_SIZE] = "\0";
    my_h_keyring_keys_metadata_iterator forward_iterator = nullptr;
    my_service<SERVICE_TYPE(keyring_keys_metadata_iterator)>
        keys_metadata_iterator("keyring_keys_metadata_iterator", m_reg_srv);
    if (!keys_metadata_iterator.is_valid()) {
      return true;
    }
 
    if (keys_metadata_iterator->init(&forward_iterator) == true) {
      return true;
    }
 
    bool ok = false;
    bool move_next = false;
    for (; keys_metadata_iterator->is_valid(forward_iterator) && move_next;
         move_next = !keys_metadata_iterator->next(forward_iterator)) {
      if (keys_metadata_iterator->get(
              forward_iterator, data_id, KEYRING_ITEM_BUFFER_SIZE, auth_id,
              KEYRING_ITEM_BUFFER_SIZE) == true) {
        ok = true;
        break;
      }
      std::cout << "Key name: " << data_id << ". User name: " << auth_id << "."
                << std::endl;
      memset(data_id, 0, KEYRING_ITEM_BUFFER_SIZE);
      memset(auth_id, 0, KEYRING_ITEM_BUFFER_SIZE);
    }
 
    if (keys_metadata_iterator->deinit(forward_iterator)) {
      return true;
    }
    return ok;
  }
  @endcode
*/
 
BEGIN_SERVICE_DEFINITION(keyring_keys_metadata_iterator)
 
/**
  Forward iterator initialization.
 
  This function allocates required memory for forward_iterator and initializes
  it. Caller should use deinit() to perform clean-up.
 
  An iterator may become invalid if content of keyring is changed.
 
  @param [out] forward_iterator metadata iterator
 
  @returns Status of the operation
    @retval false Success
    @retval true  Failure
*/
 
DECLARE_BOOL_METHOD(init,
                    (my_h_keyring_keys_metadata_iterator * forward_iterator));
 
/**
  Iterator deinitialization
 
  @note forward_iterator should not be used after call to deinit
 
  @param [in, out] forward_iterator metadata iterator
 
  @returns Status of the operation
    @retval false Success
    @retval true  Failure
*/
 
DECLARE_BOOL_METHOD(deinit,
                    (my_h_keyring_keys_metadata_iterator forward_iterator));
 
/**
  Check validity of the iterator
 
  @param [in] forward_iterator metadata iterator
 
  @returns Validty of the iterator
    @retval true  Success
    @retval false Failure
*/
DECLARE_BOOL_METHOD(is_valid,
                    (my_h_keyring_keys_metadata_iterator forward_iterator));
 
/**
  Move iterator forward.
 
  @param [in,out] forward_iterator metadata iterator
 
  @returns Status of the operation
    @retval false Success - indicates that iterator is pointing to next entry
    @retval true  Failure - Failure in moving iterator forward or next was
                            called after iterator reached the end.
*/
 
DECLARE_BOOL_METHOD(next,
                    (my_h_keyring_keys_metadata_iterator forward_iterator));
 
/**
  Fetch length metadata for current key pointed by iterator
 
  @param [in]  forward_iterator forward_iterator metadata iterator
  @param [out]  data_id_length   Length of data_id buffer
  @param [out]  auth_id_length   Length of auth_id buffer
 
  @returns Status of the operation
    @retval false Success
    @retval true  Failure
*/
DECLARE_BOOL_METHOD(get_length,
                    (my_h_keyring_keys_metadata_iterator forward_iterator,
                     size_t *data_id_length, size_t *auth_id_length));
/**
  Fetch metadata for current key pointed by iterator
 
  Out buffers should be big enough to accommodate data + null terminating
  character
 
  @param [in]  forward_iterator forward_iterator metadata iterator
  @param [out] data_id          ID information of current data. Byte string.
  @param [in]  data_id_length   Length of data_id buffer
  @param [out] auth_id          Owner of the key. Byte string.
  @param [in]  auth_id_length   Length of auth_id buffer
 
  @returns Status of the operation
    @retval false Success
    @retval true  Failure
*/
DECLARE_BOOL_METHOD(get, (my_h_keyring_keys_metadata_iterator forward_iterator,
                          char *data_id, size_t data_id_length, char *auth_id,
                          size_t auth_id_length));
 
END_SERVICE_DEFINITION(keyring_keys_metadata_iterator)
 
#endif  // !KEYRING_FORWARD_ITERATOR_INCLUDED