merchant

Merchant backend to process payments, run by merchants
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lookup_spent_tokens_by_order.c (5055B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2024 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 src/backenddb/lookup_spent_tokens_by_order.c
     18  * @brief Implementation of the lookup_spent_tokens_by_order function for Postgres
     19  * @author Christian Blättler
     20  */
     21 #include "platform.h"
     22 #include <taler/taler_pq_lib.h>
     23 #include "merchant-database/lookup_spent_tokens_by_order.h"
     24 #include "helper.h"
     25 #include "merchantdb_lib.h"
     26 
     27 /**
     28  * Closure for lookup_spent_tokens_by_order_cb().
     29  */
     30 struct LookupSpentTokensByOrderContext
     31 {
     32 
     33   /**
     34    * Plugin context.
     35    */
     36   struct TALER_MERCHANTDB_PostgresContext *pg;
     37 
     38   /**
     39    * Function to call with all results.
     40    */
     41   TALER_MERCHANTDB_UsedTokensCallback cb;
     42 
     43   /**
     44    * Closure for @e cb.
     45    */
     46   void *cb_cls;
     47 
     48   /**
     49    * Set to the query result.
     50    */
     51   enum GNUNET_DB_QueryStatus qs;
     52 };
     53 
     54 
     55 /**
     56  * Function to be called with the results of a SELECT statement
     57  * that has returned @a num_results results.
     58  *
     59  * @param cls of type `struct LookupSpentTokensByOrderContext *`
     60  * @param result the postgres result
     61  * @param num_results the number of results in @a result
     62  */
     63 static void
     64 lookup_spent_tokens_by_order_cb (void *cls,
     65                                  PGresult *result,
     66                                  unsigned int num_results)
     67 {
     68   struct LookupSpentTokensByOrderContext *ctx = cls;
     69 
     70   for (unsigned int i = 0; i<num_results; i++)
     71   {
     72     uint64_t spent_token_serial;
     73     struct TALER_PrivateContractHashP h_contract_terms;
     74     struct TALER_TokenIssuePublicKeyHashP h_issue_pub;
     75     struct TALER_TokenUsePublicKeyP use_pub;
     76     struct TALER_TokenUseSignatureP use_sig;
     77     struct TALER_TokenIssueSignature issue_sig;
     78     struct GNUNET_PQ_ResultSpec rs[] = {
     79       GNUNET_PQ_result_spec_uint64 ("spent_token_serial",
     80                                     &spent_token_serial),
     81       GNUNET_PQ_result_spec_auto_from_type ("h_contract_terms",
     82                                             &h_contract_terms),
     83       GNUNET_PQ_result_spec_auto_from_type ("h_pub",
     84                                             &h_issue_pub),
     85       GNUNET_PQ_result_spec_auto_from_type ("token_pub",
     86                                             &use_pub),
     87       GNUNET_PQ_result_spec_auto_from_type ("token_sig",
     88                                             &use_sig),
     89       GNUNET_PQ_result_spec_unblinded_sig ("blind_sig",
     90                                            &issue_sig.signature),
     91       GNUNET_PQ_result_spec_end
     92     };
     93 
     94     if (GNUNET_OK !=
     95         GNUNET_PQ_extract_result (result,
     96                                   rs,
     97                                   i))
     98     {
     99       GNUNET_break (0);
    100       ctx->qs = GNUNET_DB_STATUS_HARD_ERROR;
    101       return;
    102     }
    103     ctx->cb (ctx->cb_cls,
    104              spent_token_serial,
    105              &h_contract_terms,
    106              &h_issue_pub,
    107              &use_pub,
    108              &use_sig,
    109              &issue_sig);
    110     GNUNET_PQ_cleanup_result (rs);
    111   }
    112   ctx->qs = num_results;
    113 }
    114 
    115 
    116 enum GNUNET_DB_QueryStatus
    117 TALER_MERCHANTDB_lookup_spent_tokens_by_order (
    118   struct TALER_MERCHANTDB_PostgresContext *pg,
    119   uint64_t order_serial,
    120   TALER_MERCHANTDB_UsedTokensCallback cb,
    121   void *cb_cls)
    122 {
    123   struct LookupSpentTokensByOrderContext ctx = {
    124     .pg = pg,
    125     .cb = cb,
    126     .cb_cls = cb_cls
    127   };
    128   struct GNUNET_PQ_QueryParam params[] = {
    129     GNUNET_PQ_query_param_uint64 (&order_serial),
    130     GNUNET_PQ_query_param_end
    131   };
    132   enum GNUNET_DB_QueryStatus qs;
    133 
    134   GNUNET_assert (NULL != pg->current_merchant_id);
    135   check_connection (pg);
    136   TMH_PQ_prepare_anon (pg,
    137                        "SELECT"
    138                        " spent_token_serial"
    139                        ",h_contract_terms"
    140                        ",h_pub"
    141                        ",token_pub"
    142                        ",token_sig"
    143                        ",blind_sig"
    144                        " FROM merchant_used_tokens"
    145                        " JOIN merchant_contract_terms"
    146                        "   USING (h_contract_terms)"
    147                        " JOIN merchant_token_family_keys"
    148                        "   USING (token_family_key_serial)"
    149                        " WHERE order_serial=$1");
    150   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    151                                              "",
    152                                              params,
    153                                              &lookup_spent_tokens_by_order_cb,
    154                                              &ctx);
    155 
    156   if (qs < 0)
    157     return qs;
    158   return ctx.qs;
    159 }