Line data    Source code

       1              : /*
       2              :    This file is part of TALER
       3              :    Copyright (C) 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 backenddb/pg_select_order_blinded_sigs.c
      18              :  * @brief Implementation of the select blinded sigs by order_id function for Postgres
      19              :  * @author Bohdan Potuzhnyi
      20              :  */
      21              : #include "platform.h"
      22              : #include <taler/taler_error_codes.h>
      23              : #include <taler/taler_dbevents.h>
      24              : #include <taler/taler_pq_lib.h>
      25              : #include "pg_select_order_blinded_sigs.h"
      26              : #include "pg_helper.h"
      27              : 
      28              : /**
      29              :  * @brief Context for the callback to handle the result of the blinded sigs selection.
      30              :  */
      31              : struct SelectBlindedSigsContext
      32              : {
      33              :   /**
      34              :    * @brief Callback to be called with the result of the blinded sigs selection.
      35              :    */
      36              :   void *cb_cls;
      37              : 
      38              :   /**
      39              :    * @brief Callback to be called with the result of the blinded sigs selection.
      40              :    */
      41              :   TALER_MERCHANTDB_BlindedSigCallback cb;
      42              : 
      43              :   /**
      44              :    * @brief Result status of the query.
      45              :    */
      46              :   enum GNUNET_DB_QueryStatus qs;
      47              : };
      48              : 
      49              : 
      50              : /**
      51              :  * @brief Callback to handle the result of the blinded sigs selection.
      52              :  *
      53              :  * @param cls the closure containing the callback and its context
      54              :  * @param result the result of the query
      55              :  * @param num_results number of results in the result set
      56              :  */
      57              : static void
      58            2 : restore_sig_cb (void *cls,
      59              :                 PGresult *result,
      60              :                 unsigned int num_results)
      61              : {
      62            2 :   struct SelectBlindedSigsContext *ctx = cls;
      63              : 
      64            2 :   for (unsigned int i = 0; i < num_results; i++)
      65              :   {
      66              :     struct GNUNET_HashCode h_issue;
      67              :     struct GNUNET_CRYPTO_BlindedSignature *sig;
      68            0 :     struct GNUNET_PQ_ResultSpec rs[] = {
      69            0 :       GNUNET_PQ_result_spec_auto_from_type ("token_hash",
      70              :                                             &h_issue),
      71            0 :       GNUNET_PQ_result_spec_blinded_sig ("token_blinded_signature",
      72              :                                          &sig),
      73              :       GNUNET_PQ_result_spec_end
      74              :     };
      75              : 
      76            0 :     if (GNUNET_OK !=
      77            0 :         GNUNET_PQ_extract_result (result,
      78              :                                   rs,
      79              :                                   i))
      80              :     {
      81            0 :       ctx->qs = GNUNET_DB_STATUS_HARD_ERROR;
      82            0 :       return;
      83              :     }
      84            0 :     ctx->cb (ctx->cb_cls,
      85              :              &h_issue,
      86              :              sig);
      87            0 :     GNUNET_PQ_cleanup_result (rs);
      88              :   }
      89              : }
      90              : 
      91              : 
      92              : enum GNUNET_DB_QueryStatus
      93            2 : TMH_PG_select_order_blinded_sigs (
      94              :   void *cls,
      95              :   const char *order_id,
      96              :   TALER_MERCHANTDB_BlindedSigCallback cb,
      97              :   void *cb_cls)
      98              : {
      99            2 :   struct PostgresClosure *pg = cls;
     100            2 :   struct SelectBlindedSigsContext ctx = {
     101              :     .cb = cb,
     102              :     .cb_cls = cb_cls,
     103              :     .qs = GNUNET_DB_STATUS_SUCCESS_NO_RESULTS
     104              :   };
     105              : 
     106            2 :   struct GNUNET_PQ_QueryParam params[] = {
     107            2 :     GNUNET_PQ_query_param_string (order_id),
     108              :     GNUNET_PQ_query_param_end
     109              :   };
     110              : 
     111            2 :   check_connection (pg);
     112            2 :   PREPARE (pg,
     113              :            "select_blinded_sigs",
     114              :            "SELECT"
     115              :            "  motbs.token_blinded_signature"
     116              :            " ,motbs.token_hash"
     117              :            " FROM merchant_order_token_blinded_sigs AS motbs"
     118              :            " JOIN merchant_contract_terms AS mct USING (order_serial)"
     119              :            " WHERE mct.order_id = $1"
     120              :            " ORDER BY motbs.token_index ASC");
     121            2 :   return GNUNET_PQ_eval_prepared_multi_select (
     122              :     pg->conn,
     123              :     "select_blinded_sigs",
     124              :     params,
     125              :     &restore_sig_cb,
     126              :     &ctx);
     127              : }