exchange

Base system with REST service to issue digital coins, run by the payment service provider
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exchange_api_restrictions.c (4065B)

      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  * @author Christian Grothoff
     21  */
     22 #include "taler/taler_exchange_service.h"
     23 #include <regex.h>
     24 
     25 
     26 enum GNUNET_GenericReturnValue
     27 TALER_EXCHANGE_test_account_allowed (
     28   const struct TALER_EXCHANGE_WireAccount *account,
     29   bool check_credit,
     30   const struct TALER_NormalizedPayto payto_uri)
     31 {
     32   unsigned int limit
     33     = check_credit
     34     ? account->credit_restrictions_length
     35     : account->debit_restrictions_length;
     36 
     37   /* check wire method matches */
     38   {
     39     char *wm1;
     40     char *wm2;
     41     bool ok;
     42 
     43     wm1 = TALER_payto_get_method (payto_uri.normalized_payto);
     44     if (NULL == wm1)
     45     {
     46       GNUNET_break (0);
     47       GNUNET_free (wm1);
     48       return GNUNET_SYSERR;
     49     }
     50     wm2 = TALER_payto_get_method (account->fpayto_uri.full_payto);
     51     if (NULL == wm2)
     52     {
     53       GNUNET_break (0);
     54       return GNUNET_SYSERR;
     55     }
     56     ok = (0 == strcmp (wm1,
     57                        wm2));
     58     GNUNET_free (wm1);
     59     GNUNET_free (wm2);
     60     if (! ok)
     61       return GNUNET_NO;
     62   }
     63 
     64   for (unsigned int i = 0; i<limit; i++)
     65   {
     66     const struct TALER_EXCHANGE_AccountRestriction *ar
     67       = check_credit
     68       ? &account->credit_restrictions[i]
     69       : &account->debit_restrictions[i];
     70 
     71     switch (ar->type)
     72     {
     73     case TALER_EXCHANGE_AR_INVALID:
     74       GNUNET_break (0);
     75       return GNUNET_SYSERR;
     76     case TALER_EXCHANGE_AR_DENY:
     77       return GNUNET_NO;
     78     case TALER_EXCHANGE_AR_REGEX:
     79       {
     80         regex_t ex;
     81         bool allowed = false;
     82 
     83         if (0 != regcomp (&ex,
     84                           ar->details.regex.posix_egrep,
     85                           REG_NOSUB | REG_EXTENDED))
     86         {
     87           GNUNET_break_op (0);
     88           return GNUNET_SYSERR;
     89         }
     90         if (0 ==
     91             regexec (&ex,
     92                      payto_uri.normalized_payto,
     93                      0, NULL,
     94                      0))
     95         {
     96           GNUNET_log (GNUNET_ERROR_TYPE_INFO,
     97                       "Account `%s' allowed by regex\n",
     98                       payto_uri.normalized_payto);
     99           allowed = true;
    100         }
    101         regfree (&ex);
    102         if (! allowed)
    103           return GNUNET_NO;
    104         break;
    105       }
    106     }     /* end switch */
    107   }     /* end loop over restrictions */
    108   return GNUNET_YES;
    109 }
    110 
    111 
    112 void
    113 TALER_EXCHANGE_keys_evaluate_hard_limits (
    114   const struct TALER_EXCHANGE_Keys *keys,
    115   enum TALER_KYCLOGIC_KycTriggerEvent event,
    116   struct TALER_Amount *limit)
    117 {
    118   for (unsigned int i = 0; i<keys->hard_limits_length; i++)
    119   {
    120     const struct TALER_EXCHANGE_AccountLimit *al
    121       = &keys->hard_limits[i];
    122 
    123     if (event != al->operation_type)
    124       continue;
    125     if (al->soft_limit)
    126       continue;
    127     if (! TALER_amount_cmp_currency (limit,
    128                                      &al->threshold))
    129       continue;
    130     GNUNET_break (GNUNET_OK ==
    131                   TALER_amount_min (limit,
    132                                     limit,
    133                                     &al->threshold));
    134   }
    135 }
    136 
    137 
    138 bool
    139 TALER_EXCHANGE_keys_evaluate_zero_limits (
    140   const struct TALER_EXCHANGE_Keys *keys,
    141   enum TALER_KYCLOGIC_KycTriggerEvent event)
    142 {
    143   for (unsigned int i = 0; i<keys->zero_limits_length; i++)
    144   {
    145     const struct TALER_EXCHANGE_ZeroLimitedOperation *zlo
    146       = &keys->zero_limits[i];
    147 
    148     if (event == zlo->operation_type)
    149       return true;
    150   }
    151   return false;
    152 }