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Base system with REST service to issue digital coins, run by the payment service provider
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pg_get_old_coin_by_h_blind.c (2354B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2022, 2025 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 exchangedb/pg_get_old_coin_by_h_blind.c
     18  * @brief Implementation of the get_old_coin_by_h_blind function for Postgres
     19  * @author Christian Grothoff
     20  * @author Özgür Kesim
     21  */
     22 #include "taler/platform.h"
     23 #include "taler/taler_error_codes.h"
     24 #include "taler/taler_dbevents.h"
     25 #include "taler/taler_pq_lib.h"
     26 #include "pg_get_old_coin_by_h_blind.h"
     27 #include "pg_helper.h"
     28 
     29 
     30 enum GNUNET_DB_QueryStatus
     31 TEH_PG_get_old_coin_by_h_blind (
     32   void *cls,
     33   const struct TALER_BlindedCoinHashP *h_blind_ev,
     34   struct TALER_CoinSpendPublicKeyP *old_coin_pub,
     35   uint64_t *refresh_id)
     36 {
     37   struct PostgresClosure *pg = cls;
     38   struct GNUNET_PQ_QueryParam params[] = {
     39     GNUNET_PQ_query_param_auto_from_type (h_blind_ev),
     40     GNUNET_PQ_query_param_end
     41   };
     42   struct GNUNET_PQ_ResultSpec rs[] = {
     43     GNUNET_PQ_result_spec_auto_from_type ("old_coin_pub",
     44                                           old_coin_pub),
     45     GNUNET_PQ_result_spec_uint64 ("refresh_id",
     46                                   refresh_id),
     47     GNUNET_PQ_result_spec_end
     48   };
     49 
     50   /* Used in #postgres_get_old_coin_by_h_blind() */
     51   PREPARE (pg,
     52            "old_coin_by_h_blind",
     53            "SELECT"
     54            " okc.coin_pub AS old_coin_pub"
     55            ",refresh_id"
     56            " FROM refresh "
     57            " JOIN known_coins okc ON (refresh.old_coin_pub = okc.coin_pub)"
     58            " WHERE $1=ANY(h_blind_evs)"
     59            " LIMIT 1;");
     60   return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
     61                                                    "old_coin_by_h_blind",
     62                                                    params,
     63                                                    rs);
     64 }