exchange/src/util/config.c

/*
  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 config.c
 * @brief configuration parsing functions for Taler-specific data types
 * @author Florian Dold
 * @author Benedikt Mueller
 */
#include "platform.h"
#include "taler_util.h"


enum GNUNET_GenericReturnValue
TALER_config_get_amount (const struct GNUNET_CONFIGURATION_Handle *cfg,
                         const char *section,
                         const char *option,
                         struct TALER_Amount *denom)
{
  char *str;

  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_string (cfg,
                                             section,
                                             option,
                                             &str))
  {
    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
                               section,
                               option);
    return GNUNET_NO;
  }
  if (GNUNET_OK !=
      TALER_string_to_amount (str,
                              denom))
  {
    GNUNET_free (str);
    GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
                               section,
                               option,
                               "invalid amount");
    return GNUNET_SYSERR;
  }
  GNUNET_free (str);
  return GNUNET_OK;
}


enum GNUNET_GenericReturnValue
TALER_config_get_denom_fees (const struct GNUNET_CONFIGURATION_Handle *cfg,
                             const char *currency,
                             const char *section,
                             struct TALER_DenomFeeSet *fees)
{
  if (GNUNET_OK !=
      TALER_config_get_amount (cfg,
                               section,
                               "FEE_WITHDRAW",
                               &fees->withdraw))
  {
    GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
                               "Need amount for option `%s' in section `%s'\n",
                               "FEE_WITHDRAW",
                               section);
    return GNUNET_SYSERR;
  }
  if (GNUNET_OK !=
      TALER_config_get_amount (cfg,
                               section,
                               "FEE_DEPOSIT",
                               &fees->deposit))
  {
    GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
                               "Need amount for option `%s' in section `%s'\n",
                               "FEE_DEPOSIT",
                               section);
    return GNUNET_SYSERR;
  }
  if (GNUNET_OK !=
      TALER_config_get_amount (cfg,
                               section,
                               "FEE_REFRESH",
                               &fees->refresh))
  {
    GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
                               "Need amount for option `%s' in section `%s'\n",
                               "FEE_REFRESH",
                               section);
    return GNUNET_SYSERR;
  }
  if (GNUNET_OK !=
      TALER_config_get_amount (cfg,
                               section,
                               "FEE_REFUND",
                               &fees->refund))
  {
    GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
                               "Need amount for option `%s' in section `%s'\n",
                               "FEE_REFUND",
                               section);
    return GNUNET_SYSERR;
  }
  if (GNUNET_OK !=
      TALER_denom_fee_check_currency (currency,
                                      fees))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Need fee amounts in section `%s' to use currency `%s'\n",
                section,
                currency);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}


enum GNUNET_GenericReturnValue
TALER_config_get_currency (const struct GNUNET_CONFIGURATION_Handle *cfg,
                           char **currency)
{
  size_t slen;

  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_string (cfg,
                                             "taler",
                                             "CURRENCY",
                                             currency))
  {
    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
                               "taler",
                               "CURRENCY");
    return GNUNET_SYSERR;
  }
  slen = strlen (*currency);
  if (slen >= TALER_CURRENCY_LEN)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Currency `%s' longer than the allowed limit of %u characters.",
                *currency,
                (unsigned int) TALER_CURRENCY_LEN);
    GNUNET_free (*currency);
    *currency = NULL;
    return GNUNET_SYSERR;
  }
  for (size_t i = 0; i<slen; i++)
    if (! isalpha ((unsigned char) (*currency)[i]))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Currency `%s' must only use characters from the A-Z range.",
                  *currency);
      GNUNET_free (*currency);
      *currency = NULL;
      return GNUNET_SYSERR;
    }
  return GNUNET_OK;
}