exchange

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 (2281B)

      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/taler_pq_lib.h"
     23 #include "taler/exchange-database/get_old_coin_by_h_blind.h"
     24 #include "helper.h"
     25 
     26 
     27 enum GNUNET_DB_QueryStatus
     28 TALER_EXCHANGEDB_get_old_coin_by_h_blind (
     29   struct TALER_EXCHANGEDB_PostgresContext *pg,
     30   const struct TALER_BlindedCoinHashP *h_blind_ev,
     31   struct TALER_CoinSpendPublicKeyP *old_coin_pub,
     32   uint64_t *refresh_id)
     33 {
     34   struct GNUNET_PQ_QueryParam params[] = {
     35     GNUNET_PQ_query_param_auto_from_type (h_blind_ev),
     36     GNUNET_PQ_query_param_end
     37   };
     38   struct GNUNET_PQ_ResultSpec rs[] = {
     39     GNUNET_PQ_result_spec_auto_from_type ("old_coin_pub",
     40                                           old_coin_pub),
     41     GNUNET_PQ_result_spec_uint64 ("refresh_id",
     42                                   refresh_id),
     43     GNUNET_PQ_result_spec_end
     44   };
     45 
     46   /* Used in #postgres_get_old_coin_by_h_blind() */
     47   PREPARE (pg,
     48            "old_coin_by_h_blind",
     49            "SELECT"
     50            " okc.coin_pub AS old_coin_pub"
     51            ",refresh_id"
     52            " FROM refresh "
     53            " JOIN known_coins okc ON (refresh.old_coin_pub = okc.coin_pub)"
     54            " WHERE $1=ANY(h_blind_evs)"
     55            " LIMIT 1;");
     56   return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
     57                                                    "old_coin_by_h_blind",
     58                                                    params,
     59                                                    rs);
     60 }