merchant_api_get_template.c (5686B)
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 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_template.c 19 * @brief Implementation of the GET /templates/$ID request of the merchant's HTTP API 20 * @author Priscilla HUANG 21 */ 22 #include "platform.h" 23 #include <curl/curl.h> 24 #include <jansson.h> 25 #include <microhttpd.h> /* just for HTTP status codes */ 26 #include <gnunet/gnunet_util_lib.h> 27 #include <gnunet/gnunet_curl_lib.h> 28 #include "taler_merchant_service.h" 29 #include "merchant_api_curl_defaults.h" 30 #include <taler/taler_json_lib.h> 31 #include <taler/taler_signatures.h> 32 33 34 /** 35 * Handle for a GET /templates/$ID operation. 36 */ 37 struct TALER_MERCHANT_TemplateGetHandle 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_TemplateGetCallback 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 /templates/$ID request. 70 * 71 * @param cls the `struct TALER_MERCHANT_TemplateGetHandle` 72 * @param response_code HTTP response code, 0 on error 73 * @param response response body, NULL if not in JSON 74 */ 75 static void 76 handle_get_template_finished (void *cls, 77 long response_code, 78 const void *response) 79 { 80 struct TALER_MERCHANT_TemplateGetHandle *tgh = cls; 81 const json_t *json = response; 82 struct TALER_MERCHANT_TemplateGetResponse tgr = { 83 .hr.http_status = (unsigned int) response_code, 84 .hr.reply = json 85 }; 86 87 tgh->job = NULL; 88 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 89 "Got /templates/$ID response with status code %u\n", 90 (unsigned int) response_code); 91 switch (response_code) 92 { 93 case MHD_HTTP_OK: 94 { 95 const json_t *contract; 96 struct GNUNET_JSON_Specification spec[] = { 97 GNUNET_JSON_spec_string ("template_description", 98 &tgr.details.ok.template_description), 99 GNUNET_JSON_spec_mark_optional ( 100 GNUNET_JSON_spec_string ("otp_id", 101 &tgr.details.ok.otp_id), 102 NULL), 103 GNUNET_JSON_spec_object_const ("template_contract", 104 &contract), 105 GNUNET_JSON_spec_end () 106 }; 107 108 if (GNUNET_OK == 109 GNUNET_JSON_parse (json, 110 spec, 111 NULL, NULL)) 112 { 113 tgr.details.ok.template_contract = contract; 114 tgh->cb (tgh->cb_cls, 115 &tgr); 116 TALER_MERCHANT_template_get_cancel (tgh); 117 return; 118 } 119 tgr.hr.http_status = 0; 120 tgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE; 121 break; 122 } 123 case MHD_HTTP_UNAUTHORIZED: 124 tgr.hr.ec = TALER_JSON_get_error_code (json); 125 tgr.hr.hint = TALER_JSON_get_error_hint (json); 126 /* Nothing really to verify, merchant says we need to authenticate. */ 127 break; 128 case MHD_HTTP_NOT_FOUND: 129 tgr.hr.ec = TALER_JSON_get_error_code (json); 130 tgr.hr.hint = TALER_JSON_get_error_hint (json); 131 break; 132 default: 133 /* unexpected response code */ 134 tgr.hr.ec = TALER_JSON_get_error_code (json); 135 tgr.hr.hint = TALER_JSON_get_error_hint (json); 136 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, 137 "Unexpected response code %u/%d\n", 138 (unsigned int) response_code, 139 (int) tgr.hr.ec); 140 break; 141 } 142 tgh->cb (tgh->cb_cls, 143 &tgr); 144 TALER_MERCHANT_template_get_cancel (tgh); 145 } 146 147 148 struct TALER_MERCHANT_TemplateGetHandle * 149 TALER_MERCHANT_template_get ( 150 struct GNUNET_CURL_Context *ctx, 151 const char *backend_url, 152 const char *template_id, 153 TALER_MERCHANT_TemplateGetCallback cb, 154 void *cb_cls) 155 { 156 struct TALER_MERCHANT_TemplateGetHandle *tgh; 157 CURL *eh; 158 159 tgh = GNUNET_new (struct TALER_MERCHANT_TemplateGetHandle); 160 tgh->ctx = ctx; 161 tgh->cb = cb; 162 tgh->cb_cls = cb_cls; 163 { 164 char *path; 165 166 GNUNET_asprintf (&path, 167 "private/templates/%s", 168 template_id); 169 tgh->url = TALER_url_join (backend_url, 170 path, 171 NULL); 172 GNUNET_free (path); 173 } 174 if (NULL == tgh->url) 175 { 176 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, 177 "Could not construct request URL.\n"); 178 GNUNET_free (tgh); 179 return NULL; 180 } 181 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 182 "Requesting URL '%s'\n", 183 tgh->url); 184 eh = TALER_MERCHANT_curl_easy_get_ (tgh->url); 185 tgh->job = GNUNET_CURL_job_add (ctx, 186 eh, 187 &handle_get_template_finished, 188 tgh); 189 return tgh; 190 } 191 192 193 void 194 TALER_MERCHANT_template_get_cancel ( 195 struct TALER_MERCHANT_TemplateGetHandle *tgh) 196 { 197 if (NULL != tgh->job) 198 GNUNET_CURL_job_cancel (tgh->job); 199 GNUNET_free (tgh->url); 200 GNUNET_free (tgh); 201 }