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1 : /* 2 : This file is part of TALER 3 : Copyright (C) 2021 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_delete_transfer.c 19 : * @brief Implementation of the DELETE /transfer/$ID request of the merchant's HTTP API 20 : * @author Christian Grothoff 21 : */ 22 : #include "platform.h" 23 : #include <curl/curl.h> 24 : #include <jansson.h> 25 : #include <microhttpd.h> /* just for HTTP status codes */ 26 : #include <gnunet/gnunet_util_lib.h> 27 : #include <gnunet/gnunet_curl_lib.h> 28 : #include "taler_merchant_service.h" 29 : #include "merchant_api_curl_defaults.h" 30 : #include <taler/taler_json_lib.h> 31 : #include <taler/taler_signatures.h> 32 : 33 : 34 : /** 35 : * Handle for a DELETE /transfers/$ID operation. 36 : */ 37 : struct TALER_MERCHANT_TransferDeleteHandle 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_TransferDeleteCallback 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 /transfers/$ID request. 70 : * 71 : * @param cls the `struct TALER_MERCHANT_TransferDeleteHandle` 72 : * @param response_code HTTP response code, 0 on error 73 : * @param response response body, NULL if not in JSON 74 : */ 75 : static void 76 0 : handle_delete_transfer_finished (void *cls, 77 : long response_code, 78 : const void *response) 79 : { 80 0 : struct TALER_MERCHANT_TransferDeleteHandle *tdh = cls; 81 0 : const json_t *json = response; 82 0 : struct TALER_MERCHANT_HttpResponse hr = { 83 0 : .http_status = (unsigned int) response_code, 84 : .reply = json 85 : }; 86 : 87 0 : tdh->job = NULL; 88 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 89 : "Got /transfers/$ID response with status code %u\n", 90 : (unsigned int) response_code); 91 0 : switch (response_code) 92 : { 93 0 : case MHD_HTTP_NO_CONTENT: 94 0 : break; 95 0 : case MHD_HTTP_UNAUTHORIZED: 96 0 : hr.ec = TALER_JSON_get_error_code (json); 97 0 : hr.hint = TALER_JSON_get_error_hint (json); 98 : /* Nothing really to verify, merchant says we need to authenticate. */ 99 0 : break; 100 0 : case MHD_HTTP_NOT_FOUND: 101 0 : hr.ec = TALER_JSON_get_error_code (json); 102 0 : hr.hint = TALER_JSON_get_error_hint (json); 103 0 : break; 104 0 : case MHD_HTTP_CONFLICT: 105 0 : hr.ec = TALER_JSON_get_error_code (json); 106 0 : hr.hint = TALER_JSON_get_error_hint (json); 107 0 : break; 108 0 : default: 109 : /* unexpected response code */ 110 0 : hr.ec = TALER_JSON_get_error_code (json); 111 0 : hr.hint = TALER_JSON_get_error_hint (json); 112 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR, 113 : "Unexpected response code %u/%d\n", 114 : (unsigned int) response_code, 115 : (int) hr.ec); 116 0 : break; 117 : } 118 0 : tdh->cb (tdh->cb_cls, 119 : &hr); 120 0 : TALER_MERCHANT_transfer_delete_cancel (tdh); 121 0 : } 122 : 123 : 124 : struct TALER_MERCHANT_TransferDeleteHandle * 125 0 : TALER_MERCHANT_transfer_delete ( 126 : struct GNUNET_CURL_Context *ctx, 127 : const char *backend_url, 128 : uint64_t wire_transfer_serial, 129 : TALER_MERCHANT_TransferDeleteCallback cb, 130 : void *cb_cls) 131 : { 132 : struct TALER_MERCHANT_TransferDeleteHandle *tdh; 133 : 134 0 : tdh = GNUNET_new (struct TALER_MERCHANT_TransferDeleteHandle); 135 0 : tdh->ctx = ctx; 136 0 : tdh->cb = cb; 137 0 : tdh->cb_cls = cb_cls; 138 : { 139 : char *path; 140 : 141 0 : GNUNET_asprintf (&path, 142 : "private/transfers/%llu", 143 : (unsigned long long) wire_transfer_serial); 144 0 : tdh->url = TALER_url_join (backend_url, 145 : path, 146 : NULL); 147 0 : GNUNET_free (path); 148 : } 149 0 : if (NULL == tdh->url) 150 : { 151 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR, 152 : "Could not construct request URL.\n"); 153 0 : GNUNET_free (tdh); 154 0 : return NULL; 155 : } 156 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 157 : "Requesting URL '%s'\n", 158 : tdh->url); 159 : { 160 : CURL *eh; 161 : 162 0 : eh = TALER_MERCHANT_curl_easy_get_ (tdh->url); 163 0 : GNUNET_assert (CURLE_OK == 164 : curl_easy_setopt (eh, 165 : CURLOPT_CUSTOMREQUEST, 166 : MHD_HTTP_METHOD_DELETE)); 167 0 : tdh->job = GNUNET_CURL_job_add (ctx, 168 : eh, 169 : &handle_delete_transfer_finished, 170 : tdh); 171 : } 172 0 : return tdh; 173 : } 174 : 175 : 176 : void 177 0 : TALER_MERCHANT_transfer_delete_cancel ( 178 : struct TALER_MERCHANT_TransferDeleteHandle *tdh) 179 : { 180 0 : if (NULL != tdh->job) 181 0 : GNUNET_CURL_job_cancel (tdh->job); 182 0 : GNUNET_free (tdh->url); 183 0 : GNUNET_free (tdh); 184 0 : }