insert_client.c (3647B)
1 /* 2 This file is part of Challenger 3 Copyright (C) 2023 Taler Systems SA 4 5 Challenger 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 Challenger 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 Challenger; see the file COPYING. If not, see <http://www.gnu.org/licenses/> 15 */ 16 /** 17 * @file src/challengerdb/insert_client.c 18 * @brief Implementation of the insert_client 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 "insert_client.h" 26 #include "pg_helper.h" 27 28 29 enum GNUNET_DB_QueryStatus 30 CHALLENGERDB_insert_client (struct CHALLENGERDB_PostgresContext *ctx, 31 const char *client_redirect_uri, 32 const char *client_secret, 33 uint64_t *client_id, 34 bool *uri_taken) 35 { 36 struct GNUNET_PQ_QueryParam params[] = { 37 GNUNET_PQ_query_param_string (client_redirect_uri), 38 GNUNET_PQ_query_param_string (client_secret), 39 GNUNET_PQ_query_param_end 40 }; 41 bool inserted; 42 bool taken; 43 struct GNUNET_PQ_ResultSpec rs[] = { 44 GNUNET_PQ_result_spec_allow_null ( 45 GNUNET_PQ_result_spec_uint64 ("client_serial_id", 46 client_id), 47 NULL), 48 GNUNET_PQ_result_spec_bool ("inserted", 49 &inserted), 50 GNUNET_PQ_result_spec_bool ("uri_taken", 51 &taken), 52 GNUNET_PQ_result_spec_end 53 }; 54 enum GNUNET_DB_QueryStatus qs; 55 56 *client_id = 0; 57 *uri_taken = false; 58 /* The ON CONFLICT arbiter must be spelled out: a bare 'ON CONFLICT DO 59 NOTHING' swallows *any* unique violation, including one on the primary 60 key, which happens when the identity sequence of 'clients' lags behind 61 max(client_serial_id) (e.g. after a restore that did not restore the 62 sequence). As GNUnet maps every unique violation to NO_RESULTS, the 63 caller could not tell that apart from "this URI is already registered" 64 either, so report whether the URI was taken; if it was not, the INSERT 65 failed for a different reason and the caller must say so. */ 66 PREPARE (ctx, 67 "insert_client", 68 "WITH ins AS (" 69 " INSERT INTO clients" 70 " (uri" 71 " ,client_secret" 72 " ) VALUES " 73 " ($1, $2)" 74 " ON CONFLICT (uri) DO NOTHING" 75 " RETURNING client_serial_id" 76 ") SELECT" 77 " (SELECT client_serial_id FROM ins) AS client_serial_id" 78 " ,EXISTS (SELECT 1 FROM ins) AS inserted" 79 " ,EXISTS (SELECT 1 FROM clients WHERE uri=$1) AS uri_taken;"); 80 qs = GNUNET_PQ_eval_prepared_singleton_select (ctx->conn, 81 "insert_client", 82 params, 83 rs); 84 if (0 > qs) 85 return qs; 86 if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs) 87 return qs; 88 *uri_taken = taken; 89 if (! inserted) 90 { 91 *client_id = 0; 92 return GNUNET_DB_STATUS_SUCCESS_NO_RESULTS; 93 } 94 return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT; 95 }