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Base system with REST service to issue digital coins, run by the payment service provider
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pg_select_kyc_attributes.c (4352B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2022, 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 exchangedb/pg_select_kyc_attributes.c
     18  * @brief Implementation of the select_kyc_attributes function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/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_kyc_attributes.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 /**
     30  * Closure for #get_attributes_cb().
     31  */
     32 struct GetAttributesContext
     33 {
     34   /**
     35    * Function to call per result.
     36    */
     37   TALER_EXCHANGEDB_AttributeCallback cb;
     38 
     39   /**
     40    * Closure for @e cb.
     41    */
     42   void *cb_cls;
     43 
     44   /**
     45    * Plugin context.
     46    */
     47   struct PostgresClosure *pg;
     48 
     49   /**
     50    * Key of our query.
     51    */
     52   const struct TALER_NormalizedPaytoHashP *h_payto;
     53 
     54   /**
     55    * Flag set to #GNUNET_OK as long as everything is fine.
     56    */
     57   enum GNUNET_GenericReturnValue status;
     58 
     59 };
     60 
     61 
     62 /**
     63  * Invoke the callback for each result.
     64  *
     65  * @param cls a `struct GetAttributesContext *`
     66  * @param result SQL result
     67  * @param num_results number of rows in @a result
     68  */
     69 static void
     70 get_attributes_cb (void *cls,
     71                    PGresult *result,
     72                    unsigned int num_results)
     73 {
     74   struct GetAttributesContext *ctx = cls;
     75 
     76   for (unsigned int i = 0; i < num_results; i++)
     77   {
     78     struct GNUNET_TIME_Timestamp collection_time;
     79     struct GNUNET_TIME_Timestamp expiration_time;
     80     size_t enc_attributes_size;
     81     void *enc_attributes;
     82     char *provider;
     83     struct GNUNET_PQ_ResultSpec rs[] = {
     84       GNUNET_PQ_result_spec_string ("provider_name",
     85                                     &provider),
     86       GNUNET_PQ_result_spec_timestamp ("collection_time",
     87                                        &collection_time),
     88       GNUNET_PQ_result_spec_timestamp ("expiration_time",
     89                                        &expiration_time),
     90       GNUNET_PQ_result_spec_variable_size ("encrypted_attributes",
     91                                            &enc_attributes,
     92                                            &enc_attributes_size),
     93       GNUNET_PQ_result_spec_end
     94     };
     95 
     96     if (GNUNET_OK !=
     97         GNUNET_PQ_extract_result (result,
     98                                   rs,
     99                                   i))
    100     {
    101       GNUNET_break (0);
    102       ctx->status = GNUNET_SYSERR;
    103       return;
    104     }
    105     ctx->cb (ctx->cb_cls,
    106              ctx->h_payto,
    107              provider,
    108              collection_time,
    109              expiration_time,
    110              enc_attributes_size,
    111              enc_attributes);
    112     GNUNET_PQ_cleanup_result (rs);
    113   }
    114 }
    115 
    116 
    117 enum GNUNET_DB_QueryStatus
    118 TEH_PG_select_kyc_attributes (
    119   void *cls,
    120   const struct TALER_NormalizedPaytoHashP *h_payto,
    121   TALER_EXCHANGEDB_AttributeCallback cb,
    122   void *cb_cls)
    123 {
    124   struct PostgresClosure *pg = cls;
    125   struct GNUNET_PQ_QueryParam params[] = {
    126     GNUNET_PQ_query_param_auto_from_type (h_payto),
    127     GNUNET_PQ_query_param_end
    128   };
    129   struct GetAttributesContext ctx = {
    130     .cb = cb,
    131     .cb_cls = cb_cls,
    132     .pg = pg,
    133     .h_payto = h_payto,
    134     .status = GNUNET_OK
    135   };
    136   enum GNUNET_DB_QueryStatus qs;
    137 
    138   PREPARE (pg,
    139            "select_kyc_attributes",
    140            "SELECT "
    141            " lp.provider_name"
    142            ",ka.collection_time"
    143            ",ka.expiration_time"
    144            ",ka.encrypted_attributes"
    145            " FROM kyc_attributes ka"
    146            " JOIN legitimization_processes lp"
    147            "   ON (ka.legitimization_serial = lp.legitimization_process_serial_id)"
    148            " WHERE ka.h_payto=$1");
    149   qs = GNUNET_PQ_eval_prepared_multi_select (
    150     pg->conn,
    151     "select_kyc_attributes",
    152     params,
    153     &get_attributes_cb,
    154     &ctx);
    155   if (GNUNET_OK != ctx.status)
    156     return GNUNET_DB_STATUS_HARD_ERROR;
    157   return qs;
    158 }