merchant

Merchant backend to process payments, run by merchants
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pg_solve_mfa_challenge.c (2818B)

      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_solve_mfa_challenge.c
     18  * @brief Implementation of the solve_mfa_challenge function for Postgres
     19  * @author Christian Grothoff
     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_solve_mfa_challenge.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 enum GNUNET_DB_QueryStatus
     30 TMH_PG_solve_mfa_challenge (
     31   void *cls,
     32   uint64_t challenge_id,
     33   const struct TALER_MERCHANT_MFA_BodyHash *h_body,
     34   const char *solution,
     35   bool *solved,
     36   uint32_t *retry_counter)
     37 {
     38   struct PostgresClosure *pg = cls;
     39   struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
     40   bool no_match;
     41   struct GNUNET_PQ_QueryParam params[] = {
     42     GNUNET_PQ_query_param_uint64 (&challenge_id),
     43     GNUNET_PQ_query_param_auto_from_type (h_body),
     44     GNUNET_PQ_query_param_string (solution),
     45     GNUNET_PQ_query_param_absolute_time (&now),
     46     GNUNET_PQ_query_param_end
     47   };
     48   struct GNUNET_PQ_ResultSpec rs[] = {
     49     GNUNET_PQ_result_spec_bool ("out_solved",
     50                                 solved),
     51     GNUNET_PQ_result_spec_allow_null (
     52       GNUNET_PQ_result_spec_uint32 ("out_retry_counter",
     53                                     retry_counter),
     54       &no_match),
     55     GNUNET_PQ_result_spec_end
     56   };
     57   enum GNUNET_DB_QueryStatus qs;
     58 
     59   /* conservatively set security-relevant return values to
     60      safe values, even though these should not be used with qs <= 0 */
     61   *solved = false;
     62   *retry_counter = 0;
     63   PREPARE (pg,
     64            "solve_mfa_challenge",
     65            "SELECT"
     66            "  out_solved"
     67            " ,out_retry_counter"
     68            "  FROM merchant_do_solve_mfa_challenge"
     69            " ($1, $2, $3, $4);");
     70   qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
     71                                                  "solve_mfa_challenge",
     72                                                  params,
     73                                                  rs);
     74   if (qs <= 0)
     75     return qs;
     76   if (no_match)
     77   {
     78     GNUNET_PQ_cleanup_result (rs);
     79     return GNUNET_DB_STATUS_SUCCESS_NO_RESULTS;
     80   }
     81   GNUNET_PQ_cleanup_result (rs);
     82   return qs;
     83 }