merchant

Merchant backend to process payments, run by merchants
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taler-merchant-httpd_kyc-order.c (2789B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2026 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 <http://www.gnu.org/licenses/>
     15  */
     16 /**
     17  * @file backend/taler-merchant-httpd_kyc-order.c
     18  * @brief Deterministic ordering of KYC response data
     19  */
     20 #include "platform.h"
     21 #include <gnunet/gnunet_util_lib.h>
     22 #include "taler-merchant-httpd_kyc-order.h"
     23 
     24 
     25 /**
     26  * Compare two entries in a KYC response.
     27  *
     28  * @param a pointer to the first JSON entry
     29  * @param b pointer to the second JSON entry
     30  * @return result of the comparison
     31  */
     32 static int
     33 compare_kyc_data (const void *a,
     34                   const void *b)
     35 {
     36   const json_t *ja = *(const json_t * const *) a;
     37   const json_t *jb = *(const json_t * const *) b;
     38   const char *ha;
     39   const char *hb;
     40   const char *ea;
     41   const char *eb;
     42   int ret;
     43 
     44   ha = json_string_value (json_object_get (ja,
     45                                            "h_wire"));
     46   hb = json_string_value (json_object_get (jb,
     47                                            "h_wire"));
     48   ea = json_string_value (json_object_get (ja,
     49                                            "exchange_url"));
     50   eb = json_string_value (json_object_get (jb,
     51                                            "exchange_url"));
     52   GNUNET_assert (NULL != ha);
     53   GNUNET_assert (NULL != hb);
     54   GNUNET_assert (NULL != ea);
     55   GNUNET_assert (NULL != eb);
     56   ret = strcmp (ha,
     57                 hb);
     58   if (0 != ret)
     59     return ret;
     60   return strcmp (ea,
     61                  eb);
     62 }
     63 
     64 
     65 void
     66 TMH_kyc_data_sort (json_t *kyc_data)
     67 {
     68   json_t **entries;
     69   size_t len;
     70 
     71   GNUNET_assert (json_is_array (kyc_data));
     72   len = json_array_size (kyc_data);
     73   if (2 > len)
     74     return;
     75   entries = GNUNET_new_array (len,
     76                               json_t *);
     77   for (size_t i = 0; i < len; i++)
     78   {
     79     entries[i] = json_array_get (kyc_data,
     80                                  i);
     81     GNUNET_assert (NULL != entries[i]);
     82     json_incref (entries[i]);
     83   }
     84   qsort (entries,
     85          len,
     86          sizeof (*entries),
     87          &compare_kyc_data);
     88   for (size_t i = 0; i < len; i++)
     89     GNUNET_assert (0 ==
     90                    json_array_set_new (kyc_data,
     91                                        i,
     92                                        entries[i]));
     93   GNUNET_free (entries);
     94 }