get_exists_aml_officer.c (2363B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2022 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/get_exists_aml_officer.c 18 * @brief Implementation of the get_exists_aml_officer function for Postgres 19 * @author Christian Grothoff 20 */ 21 #include "taler/taler_pq_lib.h" 22 #include "exchange-database/get_exists_aml_officer.h" 23 #include "helper.h" 24 25 26 enum GNUNET_DB_QueryStatus 27 TALER_EXCHANGEDB_get_exists_aml_officer ( 28 struct TALER_EXCHANGEDB_PostgresContext *pg, 29 const struct TALER_AmlOfficerPublicKeyP *decider_pub, 30 bool *read_only) 31 { 32 struct GNUNET_PQ_QueryParam params[] = { 33 GNUNET_PQ_query_param_auto_from_type (decider_pub), 34 GNUNET_PQ_query_param_end 35 }; 36 struct GNUNET_PQ_ResultSpec rs[] = { 37 GNUNET_PQ_result_spec_bool ("read_only", 38 read_only), 39 GNUNET_PQ_result_spec_end 40 }; 41 42 /* aml_staff is append-only, so the officer's status is the row with the 43 greatest last_change. The is_active filter has to be applied to that 44 row and only to it: filtering first would let any active status the 45 officer ever held answer for one that has since been revoked. */ 46 PREPARE (pg, 47 "get_exists_aml_officer", 48 "SELECT read_only" 49 " FROM (SELECT is_active" 50 " ,read_only" 51 " FROM aml_staff" 52 " WHERE decider_pub=$1" 53 " ORDER BY last_change DESC" 54 " LIMIT 1) latest" 55 " WHERE is_active;"); 56 return GNUNET_PQ_eval_prepared_singleton_select (pg->conn, 57 "get_exists_aml_officer", 58 params, 59 rs); 60 }