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/*
This file is part of TALER
Copyright (C) 2014-2020 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file include/taler_exchangedb_lib.h
* @brief IO operations for the exchange's private keys
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#ifndef TALER_EXCHANGEDB_LIB_H
#define TALER_EXCHANGEDB_LIB_H
#include "taler_signatures.h"
#include "taler_exchangedb_plugin.h"
#include "taler_bank_service.h"
/**
* Initialize the plugin.
*
* @param cfg configuration to use
* @return NULL on failure
*/
struct TALER_EXCHANGEDB_Plugin *
TALER_EXCHANGEDB_plugin_load (const struct GNUNET_CONFIGURATION_Handle *cfg);
/**
* Shutdown the plugin.
*
* @param plugin plugin to unload
*/
void
TALER_EXCHANGEDB_plugin_unload (struct TALER_EXCHANGEDB_Plugin *plugin);
/**
* Information about an account from the configuration.
*/
struct TALER_EXCHANGEDB_AccountInfo
{
/**
* Section in the configuration file that specifies the
* account. Must start with "exchange-account-".
*/
const char *section_name;
/**
* Name of the wire method used by this account.
*/
const char *method;
/**
* #GNUNET_YES if this account is enabed to be debited
* by the taler-exchange-aggregator.
*/
int debit_enabled;
/**
* #GNUNET_YES if this account is enabed to be credited by wallets
* and needs to be watched by the taler-exchange-wirewatch.
* Also, the account will only be included in /wire if credit
* is enabled.
*/
int credit_enabled;
};
/**
* Function called with information about a wire account.
*
* @param cls closure
* @param ai account information
*/
typedef void
(*TALER_EXCHANGEDB_AccountCallback)(
void *cls,
const struct TALER_EXCHANGEDB_AccountInfo *ai);
/**
* Parse the configuration to find account information.
*
* @param cfg configuration to use
* @param cb callback to invoke
* @param cb_cls closure for @a cb
* @return #GNUNET_OK if the configuration seems valid, #GNUNET_SYSERR if not
*/
int
TALER_EXCHANGEDB_find_accounts (const struct GNUNET_CONFIGURATION_Handle *cfg,
TALER_EXCHANGEDB_AccountCallback cb,
void *cb_cls);
/**
* Calculate the total value of all transactions performed.
* Stores @a off plus the cost of all transactions in @a tl
* in @a ret.
*
* @param tl transaction list to process
* @param off offset to use as the starting value
* @param[out] ret where the resulting total is to be stored
* @return #GNUNET_OK on success, #GNUNET_SYSERR on errors
*/
int
TALER_EXCHANGEDB_calculate_transaction_list_totals (
struct TALER_EXCHANGEDB_TransactionList *tl,
const struct TALER_Amount *off,
struct TALER_Amount *ret);
/* ***************** convenience functions ******** */
/**
* Information we keep for each supported account of the exchange.
*/
struct TALER_EXCHANGEDB_WireAccount
{
/**
* Accounts are kept in a DLL.
*/
struct TALER_EXCHANGEDB_WireAccount *next;
/**
* Plugins are kept in a DLL.
*/
struct TALER_EXCHANGEDB_WireAccount *prev;
/**
* Authentication data.
*/
struct TALER_BANK_AuthenticationData auth;
/**
* Name of the section that configures this account.
*/
char *section_name;
/**
* Name of the wire method underlying the account.
*/
char *method;
};
/**
* Find the wire plugin for the given payto:// URL.
* Only useful after the accounts have been loaded
* using #TALER_EXCHANGEDB_load_accounts().
*
* @param method wire method we need an account for
* @return NULL on error
*/
struct TALER_EXCHANGEDB_WireAccount *
TALER_EXCHANGEDB_find_account_by_method (const char *method);
/**
* Find the wire plugin for the given payto:// URL
* Only useful after the accounts have been loaded
* using #TALER_EXCHANGEDB_load_accounts().
*
* @param url wire address we need an account for
* @return NULL on error
*/
struct TALER_EXCHANGEDB_WireAccount *
TALER_EXCHANGEDB_find_account_by_payto_uri (const char *url);
/**
* Load account information opf the exchange from
* @a cfg.
*
* @param cfg configuration to load from
* @return #GNUNET_OK on success, #GNUNET_NO if no accounts are configured
*/
int
TALER_EXCHANGEDB_load_accounts (const struct GNUNET_CONFIGURATION_Handle *cfg);
/**
* Free resources allocated by
* #TALER_EXCHANGEDB_load_accounts().
*/
void
TALER_EXCHANGEDB_unload_accounts (void);
#endif
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