merchant_api_get_product.c (7152B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2014--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 Lesser General Public License as published by the Free Software 7 Foundation; either version 2.1, 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 Lesser General Public License for more details. 12 13 You should have received a copy of the GNU Lesser General Public License along with 14 TALER; see the file COPYING.LGPL. If not, see 15 <http://www.gnu.org/licenses/> 16 */ 17 /** 18 * @file merchant_api_get_product.c 19 * @brief Implementation of the GET /product/$ID request of the merchant's HTTP API 20 * @author Christian Grothoff 21 */ 22 #include "platform.h" 23 #include <curl/curl.h> 24 #include <jansson.h> 25 #include <microhttpd.h> /* just for HTTP status codes */ 26 #include <gnunet/gnunet_util_lib.h> 27 #include <gnunet/gnunet_curl_lib.h> 28 #include "taler_merchant_service.h" 29 #include "merchant_api_curl_defaults.h" 30 #include <taler/taler_json_lib.h> 31 #include <taler/taler_signatures.h> 32 33 34 /** 35 * Handle for a GET /products/$ID operation. 36 */ 37 struct TALER_MERCHANT_ProductGetHandle 38 { 39 /** 40 * The url for this request. 41 */ 42 char *url; 43 44 /** 45 * Handle for the request. 46 */ 47 struct GNUNET_CURL_Job *job; 48 49 /** 50 * Function to call with the result. 51 */ 52 TALER_MERCHANT_ProductGetCallback cb; 53 54 /** 55 * Closure for @a cb. 56 */ 57 void *cb_cls; 58 59 /** 60 * Reference to the execution context. 61 */ 62 struct GNUNET_CURL_Context *ctx; 63 64 }; 65 66 67 /** 68 * Function called when we're done processing the 69 * HTTP GET /products/$ID request. 70 * 71 * @param cls the `struct TALER_MERCHANT_ProductGetHandle` 72 * @param response_code HTTP response code, 0 on error 73 * @param response response body, NULL if not in JSON 74 */ 75 static void 76 handle_get_product_finished (void *cls, 77 long response_code, 78 const void *response) 79 { 80 struct TALER_MERCHANT_ProductGetHandle *pgh = cls; 81 const json_t *json = response; 82 struct TALER_MERCHANT_ProductGetResponse pgr = { 83 .hr.http_status = (unsigned int) response_code, 84 .hr.reply = json 85 }; 86 87 pgh->job = NULL; 88 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 89 "Got /products/$ID response with status code %u\n", 90 (unsigned int) response_code); 91 switch (response_code) 92 { 93 case MHD_HTTP_OK: 94 { 95 struct GNUNET_JSON_Specification spec[] = { 96 GNUNET_JSON_spec_string ( 97 "product_name", 98 &pgr.details.ok.product_name), 99 GNUNET_JSON_spec_string ( 100 "description", 101 &pgr.details.ok.description), 102 GNUNET_JSON_spec_object_const ( 103 "description_i18n", 104 &pgr.details.ok.description_i18n), 105 GNUNET_JSON_spec_string ( 106 "unit", 107 &pgr.details.ok.unit), 108 TALER_JSON_spec_amount_any_array ( 109 "unit_price", 110 &pgr.details.ok.unit_price_len, 111 (struct TALER_Amount **) &pgr.details.ok.unit_price), 112 TALER_JSON_spec_amount_any ( 113 "price", 114 &pgr.details.ok.price), 115 GNUNET_JSON_spec_mark_optional ( 116 GNUNET_JSON_spec_string ( 117 "image", 118 &pgr.details.ok.image), 119 NULL), 120 GNUNET_JSON_spec_mark_optional ( 121 GNUNET_JSON_spec_array_const ( 122 "taxes", 123 &pgr.details.ok.taxes), 124 NULL), 125 GNUNET_JSON_spec_int64 ( 126 "total_stock", 127 &pgr.details.ok.total_stock), 128 GNUNET_JSON_spec_string ( 129 "unit_total_stock", 130 &pgr.details.ok.unit_total_stock), 131 GNUNET_JSON_spec_bool ( 132 "unit_allow_fraction", 133 &pgr.details.ok.unit_allow_fraction), 134 GNUNET_JSON_spec_uint32 ( 135 "unit_precision_level", 136 &pgr.details.ok.unit_precision_level), 137 GNUNET_JSON_spec_uint64 ( 138 "total_sold", 139 &pgr.details.ok.total_sold), 140 GNUNET_JSON_spec_uint64 ( 141 "total_lost", 142 &pgr.details.ok.total_lost), 143 GNUNET_JSON_spec_mark_optional ( 144 GNUNET_JSON_spec_object_const ( 145 "address", 146 &pgr.details.ok.location), 147 NULL), 148 GNUNET_JSON_spec_mark_optional ( 149 GNUNET_JSON_spec_timestamp ( 150 "next_restock", 151 &pgr.details.ok.next_restock), 152 NULL), 153 GNUNET_JSON_spec_end () 154 }; 155 156 if (GNUNET_OK == 157 GNUNET_JSON_parse (json, 158 spec, 159 NULL, NULL)) 160 { 161 pgh->cb (pgh->cb_cls, 162 &pgr); 163 GNUNET_JSON_parse_free (spec); 164 TALER_MERCHANT_product_get_cancel (pgh); 165 return; 166 } 167 pgr.hr.http_status = 0; 168 pgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE; 169 break; 170 } 171 case MHD_HTTP_UNAUTHORIZED: 172 pgr.hr.ec = TALER_JSON_get_error_code (json); 173 pgr.hr.hint = TALER_JSON_get_error_hint (json); 174 /* Nothing really to verify, merchant says we need to authenticate. */ 175 break; 176 case MHD_HTTP_NOT_FOUND: 177 pgr.hr.ec = TALER_JSON_get_error_code (json); 178 pgr.hr.hint = TALER_JSON_get_error_hint (json); 179 break; 180 default: 181 /* unexpected response code */ 182 pgr.hr.ec = TALER_JSON_get_error_code (json); 183 pgr.hr.hint = TALER_JSON_get_error_hint (json); 184 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, 185 "Unexpected response code %u/%d\n", 186 (unsigned int) response_code, 187 (int) pgr.hr.ec); 188 break; 189 } 190 pgh->cb (pgh->cb_cls, 191 &pgr); 192 TALER_MERCHANT_product_get_cancel (pgh); 193 } 194 195 196 struct TALER_MERCHANT_ProductGetHandle * 197 TALER_MERCHANT_product_get ( 198 struct GNUNET_CURL_Context *ctx, 199 const char *backend_url, 200 const char *product_id, 201 TALER_MERCHANT_ProductGetCallback cb, 202 void *cb_cls) 203 { 204 struct TALER_MERCHANT_ProductGetHandle *pgh; 205 CURL *eh; 206 207 pgh = GNUNET_new (struct TALER_MERCHANT_ProductGetHandle); 208 pgh->ctx = ctx; 209 pgh->cb = cb; 210 pgh->cb_cls = cb_cls; 211 { 212 char *path; 213 214 GNUNET_asprintf (&path, 215 "private/products/%s", 216 product_id); 217 pgh->url = TALER_url_join (backend_url, 218 path, 219 NULL); 220 GNUNET_free (path); 221 } 222 if (NULL == pgh->url) 223 { 224 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, 225 "Could not construct request URL.\n"); 226 GNUNET_free (pgh); 227 return NULL; 228 } 229 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 230 "Requesting URL '%s'\n", 231 pgh->url); 232 eh = TALER_MERCHANT_curl_easy_get_ (pgh->url); 233 pgh->job = GNUNET_CURL_job_add (ctx, 234 eh, 235 &handle_get_product_finished, 236 pgh); 237 return pgh; 238 } 239 240 241 void 242 TALER_MERCHANT_product_get_cancel ( 243 struct TALER_MERCHANT_ProductGetHandle *pgh) 244 { 245 if (NULL != pgh->job) 246 GNUNET_CURL_job_cancel (pgh->job); 247 GNUNET_free (pgh->url); 248 GNUNET_free (pgh); 249 }