Line data    Source code

       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          18 : 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          18 :   unsigned int limit
      34             :     = check_credit
      35             :     ? account->credit_restrictions_length
      36          18 :     : account->debit_restrictions_length;
      37             : 
      38             :   /* check wire method matches */
      39             :   {
      40             :     char *wm1;
      41             :     char *wm2;
      42             :     bool ok;
      43             : 
      44          18 :     wm1 = TALER_payto_get_method (payto_uri.normalized_payto);
      45          18 :     wm2 = TALER_payto_get_method (account->fpayto_uri.full_payto);
      46          18 :     ok = (0 == strcmp (wm1,
      47             :                        wm2));
      48          18 :     GNUNET_free (wm1);
      49          18 :     GNUNET_free (wm2);
      50          18 :     if (! ok)
      51           2 :       return GNUNET_NO;
      52             :   }
      53             : 
      54          16 :   for (unsigned int i = 0; i<limit; i++)
      55             :   {
      56           2 :     const struct TALER_EXCHANGE_AccountRestriction *ar
      57             :       = check_credit
      58           2 :       ? &account->credit_restrictions[i]
      59           0 :       : &account->debit_restrictions[i];
      60             : 
      61           2 :     switch (ar->type)
      62             :     {
      63           0 :     case TALER_EXCHANGE_AR_INVALID:
      64           0 :       GNUNET_break (0);
      65           0 :       return GNUNET_SYSERR;
      66           0 :     case TALER_EXCHANGE_AR_DENY:
      67           0 :       return GNUNET_NO;
      68           2 :     case TALER_EXCHANGE_AR_REGEX:
      69             :       {
      70             :         regex_t ex;
      71           2 :         bool allowed = false;
      72             : 
      73           2 :         if (0 != regcomp (&ex,
      74           2 :                           ar->details.regex.posix_egrep,
      75             :                           REG_NOSUB | REG_EXTENDED))
      76             :         {
      77           0 :           GNUNET_break_op (0);
      78           2 :           return GNUNET_SYSERR;
      79             :         }
      80           2 :         if (0 ==
      81           2 :             regexec (&ex,
      82           2 :                      payto_uri.normalized_payto,
      83             :                      0, NULL,
      84             :                      0))
      85             :         {
      86           0 :           GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      87             :                       "Account `%s' allowed by regex\n",
      88             :                       payto_uri.normalized_payto);
      89           0 :           allowed = true;
      90             :         }
      91           2 :         regfree (&ex);
      92           2 :         if (! allowed)
      93           2 :           return GNUNET_NO;
      94           0 :         break;
      95             :       }
      96             :     }     /* end switch */
      97             :   }     /* end loop over restrictions */
      98          14 :   return GNUNET_YES;
      99             : }
     100             : 
     101             : 
     102             : void
     103           0 : 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           0 :   for (unsigned int i = 0; i<keys->hard_limits_length; i++)
     109             :   {
     110           0 :     const struct TALER_EXCHANGE_AccountLimit *al
     111           0 :       = &keys->hard_limits[i];
     112             : 
     113           0 :     if (event != al->operation_type)
     114           0 :       continue;
     115           0 :     if (al->soft_limit)
     116           0 :       continue;
     117           0 :     if (! TALER_amount_cmp_currency (limit,
     118             :                                      &al->threshold))
     119           0 :       continue;
     120           0 :     GNUNET_break (GNUNET_OK ==
     121             :                   TALER_amount_min (limit,
     122             :                                     limit,
     123             :                                     &al->threshold));
     124             :   }
     125           0 : }
     126             : 
     127             : 
     128             : bool
     129           0 : TALER_EXCHANGE_keys_evaluate_zero_limits (
     130             :   const struct TALER_EXCHANGE_Keys *keys,
     131             :   enum TALER_KYCLOGIC_KycTriggerEvent event)
     132             : {
     133           0 :   for (unsigned int i = 0; i<keys->zero_limits_length; i++)
     134             :   {
     135           0 :     const struct TALER_EXCHANGE_ZeroLimitedOperation *zlo
     136           0 :       = &keys->zero_limits[i];
     137             : 
     138           0 :     if (event == zlo->operation_type)
     139           0 :       return true;
     140             :   }
     141           0 :   return false;
     142             : }