/*
     This file is part of GNUnet.
     Copyright (C) 2013 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.

     GNUnet 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/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */

/**
 * @author Christian Grothoff
 * @file identity/identity.h
 *
 * @brief Common type definitions for the identity
 *        service and API.
 */
#ifndef IDENTITY_H
#define IDENTITY_H

#include "gnunet_common.h"


GNUNET_NETWORK_STRUCT_BEGIN


/**
 * Answer from service to client about last operation;
 * GET_DEFAULT maybe answered with this message on failure;
 * CREATE and RENAME will always be answered with this message.
 */
struct ResultCodeMessage
{
  /**
   * Type: #GNUNET_MESSAGE_TYPE_IDENTITY_RESULT_CODE
   */
  struct GNUNET_MessageHeader header;

  /**
   * Status code for the last operation, in NBO.
   * (currently not used).
   */
  uint32_t result_code GNUNET_PACKED;

  /* followed by 0-terminated error message (on error) */
};


/**
 * Client informs service about desire to lookup a (single) pseudonym.
 */
struct LookupMessage
{
  /**
   * Type: #GNUNET_MESSAGE_TYPE_IDENTITY_LOOKUP or
   * #GNUNET_MESSAGE_TYPE_IDENTITY_LOOKUP_BY_SUFFIX
   */
  struct GNUNET_MessageHeader header;

  /* followed by 0-terminated ego name */
};


/**
 * Service informs client about status of a pseudonym.
 */
struct UpdateMessage
{
  /**
   * Type: #GNUNET_MESSAGE_TYPE_IDENTITY_UPDATE
   */
  struct GNUNET_MessageHeader header;

  /**
   * Number of bytes in ego name string including 0-termination, in NBO;
   * 0 if the ego was deleted.
   */
  uint16_t name_len GNUNET_PACKED;

  /**
   * Usually #GNUNET_NO, #GNUNET_YES to signal end of list.
   */
  uint16_t end_of_list GNUNET_PACKED;

  /**
   * The private key
   */
  struct GNUNET_CRYPTO_EcdsaPrivateKey private_key;

  /* followed by 0-terminated ego name */
};


/**
 * Client requests knowledge about default identity for
 * a subsystem from identity service.
 */
struct GetDefaultMessage
{
  /**
   * Type: #GNUNET_MESSAGE_TYPE_IDENTITY_GET_DEFAULT
   */
  struct GNUNET_MessageHeader header;

  /**
   * Number of bytes in service name string including 0-termination, in NBO.
   */
  uint16_t name_len GNUNET_PACKED;

  /**
   * Always zero.
   */
  uint16_t reserved GNUNET_PACKED;


  /* followed by 0-terminated service name */
};


/**
 * Used from service to client as a result to the GET_DEFAULT
 * message, used from client to service to SET_DEFAULT.
 */
struct SetDefaultMessage
{
  /**
   * Type: #GNUNET_MESSAGE_TYPE_IDENTITY_SET_DEFAULT
   */
  struct GNUNET_MessageHeader header;

  /**
   * Number of bytes in service name string including 0-termination, in NBO.
   */
  uint16_t name_len GNUNET_PACKED;

  /**
   * Always zero.
   */
  uint16_t reserved GNUNET_PACKED;

  /**
   * The private key
   */
  struct GNUNET_CRYPTO_EcdsaPrivateKey private_key;

  /* followed by 0-terminated service name */
};


/**
 * Client requests creation of an identity.  Service
 * will respond with a result code.
 */
struct CreateRequestMessage
{
  /**
   * Type: #GNUNET_MESSAGE_TYPE_IDENTITY_CREATE
   */
  struct GNUNET_MessageHeader header;

  /**
   * Number of bytes in identity name string including 0-termination, in NBO.
   */
  uint16_t name_len GNUNET_PACKED;

  /**
   * Always zero.
   */
  uint16_t reserved GNUNET_PACKED;

  /**
   * The private key
   */
  struct GNUNET_CRYPTO_EcdsaPrivateKey private_key;

  /* followed by 0-terminated identity name */
};


/**
 * Client requests renaming of an identity.  Service
 * will respond with a result code.
 */
struct RenameMessage
{
  /**
   * Type: #GNUNET_MESSAGE_TYPE_IDENTITY_RENAME
   */
  struct GNUNET_MessageHeader header;

  /**
   * Number of characters in the old name including 0-termination, in NBO.
   */
  uint16_t old_name_len GNUNET_PACKED;

  /**
   * Number of characters in the new name including 0-termination, in NBO.
   */
  uint16_t new_name_len GNUNET_PACKED;

  /* followed by 0-terminated old name */
  /* followed by 0-terminated new name */
};


/**
 * Client requests deletion of an identity.  Service
 * will respond with a result code.
 */
struct DeleteMessage
{
  /**
   * Type: #GNUNET_MESSAGE_TYPE_IDENTITY_DELETE
   */
  struct GNUNET_MessageHeader header;

  /**
   * Number of characters in the name including 0-termination, in NBO.
   */
  uint16_t name_len GNUNET_PACKED;

  /**
   * Always zero.
   */
  uint16_t reserved GNUNET_PACKED;

  /* followed by 0-terminated name */
};

GNUNET_NETWORK_STRUCT_END

/**
 * Handle for an ego.
 */
struct GNUNET_IDENTITY_Ego
{
  /**
   * Hash of the private key of this ego.
   */
  struct GNUNET_HashCode id;

  /**
   * Private key associated with this ego.
   */
  struct GNUNET_CRYPTO_EcdsaPrivateKey pk;

  /**
   * Public key associated with this ego. Initialized on demand.
   * Always use #GNUNET_IDENTITY_ego_get_public_key() to obtain.
   */
  struct GNUNET_CRYPTO_EcdsaPublicKey pub;

  /**
   * Current name associated with this ego.
   */
  char *name;

  /**
   * Client context associated with this ego.
   */
  void *ctx;

  /**
   * Set to true once @e pub was initialized
   */
  bool pub_initialized;
};


#endif
