exchange

Base system with REST service to issue digital coins, run by the payment service provider
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exchange_api_restrictions.c (3899B)

      1 /*
      2   This file is part of TALER
      3   Copyright (C) 2024 Taler Systems SA
      4 
      5   TALER is free software; you can redistribute it and/or modify it under the
      6   terms of the GNU General Public License as published by the Free Software
      7   Foundation; either version 3, or (at your option) any later version.
      8 
      9   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
     10   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
     11   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
     12 
     13   You should have received a copy of the GNU General Public License along with
     14   TALER; see the file COPYING.  If not, see
     15   <http://www.gnu.org/licenses/>
     16 */
     17 /**
     18  * @file lib/exchange_api_restrictions.c
     19  * @brief convenience functions related to account restrictions
     20 a * @author Christian Grothoff
     21  */
     22 #include "taler/platform.h"
     23 #include "taler/taler_exchange_service.h"
     24 #include <regex.h>
     25 
     26 
     27 enum GNUNET_GenericReturnValue
     28 TALER_EXCHANGE_test_account_allowed (
     29   const struct TALER_EXCHANGE_WireAccount *account,
     30   bool check_credit,
     31   const struct TALER_NormalizedPayto payto_uri)
     32 {
     33   unsigned int limit
     34     = check_credit
     35     ? account->credit_restrictions_length
     36     : account->debit_restrictions_length;
     37 
     38   /* check wire method matches */
     39   {
     40     char *wm1;
     41     char *wm2;
     42     bool ok;
     43 
     44     wm1 = TALER_payto_get_method (payto_uri.normalized_payto);
     45     wm2 = TALER_payto_get_method (account->fpayto_uri.full_payto);
     46     ok = (0 == strcmp (wm1,
     47                        wm2));
     48     GNUNET_free (wm1);
     49     GNUNET_free (wm2);
     50     if (! ok)
     51       return GNUNET_NO;
     52   }
     53 
     54   for (unsigned int i = 0; i<limit; i++)
     55   {
     56     const struct TALER_EXCHANGE_AccountRestriction *ar
     57       = check_credit
     58       ? &account->credit_restrictions[i]
     59       : &account->debit_restrictions[i];
     60 
     61     switch (ar->type)
     62     {
     63     case TALER_EXCHANGE_AR_INVALID:
     64       GNUNET_break (0);
     65       return GNUNET_SYSERR;
     66     case TALER_EXCHANGE_AR_DENY:
     67       return GNUNET_NO;
     68     case TALER_EXCHANGE_AR_REGEX:
     69       {
     70         regex_t ex;
     71         bool allowed = false;
     72 
     73         if (0 != regcomp (&ex,
     74                           ar->details.regex.posix_egrep,
     75                           REG_NOSUB | REG_EXTENDED))
     76         {
     77           GNUNET_break_op (0);
     78           return GNUNET_SYSERR;
     79         }
     80         if (0 ==
     81             regexec (&ex,
     82                      payto_uri.normalized_payto,
     83                      0, NULL,
     84                      0))
     85         {
     86           GNUNET_log (GNUNET_ERROR_TYPE_INFO,
     87                       "Account `%s' allowed by regex\n",
     88                       payto_uri.normalized_payto);
     89           allowed = true;
     90         }
     91         regfree (&ex);
     92         if (! allowed)
     93           return GNUNET_NO;
     94         break;
     95       }
     96     }     /* end switch */
     97   }     /* end loop over restrictions */
     98   return GNUNET_YES;
     99 }
    100 
    101 
    102 void
    103 TALER_EXCHANGE_keys_evaluate_hard_limits (
    104   const struct TALER_EXCHANGE_Keys *keys,
    105   enum TALER_KYCLOGIC_KycTriggerEvent event,
    106   struct TALER_Amount *limit)
    107 {
    108   for (unsigned int i = 0; i<keys->hard_limits_length; i++)
    109   {
    110     const struct TALER_EXCHANGE_AccountLimit *al
    111       = &keys->hard_limits[i];
    112 
    113     if (event != al->operation_type)
    114       continue;
    115     if (al->soft_limit)
    116       continue;
    117     if (! TALER_amount_cmp_currency (limit,
    118                                      &al->threshold))
    119       continue;
    120     GNUNET_break (GNUNET_OK ==
    121                   TALER_amount_min (limit,
    122                                     limit,
    123                                     &al->threshold));
    124   }
    125 }
    126 
    127 
    128 bool
    129 TALER_EXCHANGE_keys_evaluate_zero_limits (
    130   const struct TALER_EXCHANGE_Keys *keys,
    131   enum TALER_KYCLOGIC_KycTriggerEvent event)
    132 {
    133   for (unsigned int i = 0; i<keys->zero_limits_length; i++)
    134   {
    135     const struct TALER_EXCHANGE_ZeroLimitedOperation *zlo
    136       = &keys->zero_limits[i];
    137 
    138     if (event == zlo->operation_type)
    139       return true;
    140   }
    141   return false;
    142 }