Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2020-2026 Taler Systems SA
4 :
5 : TALER is free software; you can redistribute it and/or modify
6 : it under the terms of the GNU Lesser General Public License as
7 : published by the Free Software Foundation; either version 2.1,
8 : or (at your option) any later version.
9 :
10 : TALER is distributed in the hope that it will be useful,
11 : but WITHOUT ANY WARRANTY; without even the implied warranty of
12 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 : GNU Lesser General Public License for more details.
14 :
15 : You should have received a copy of the GNU Lesser General
16 : Public License along with TALER; see the file COPYING.LGPL.
17 : If not, see <http://www.gnu.org/licenses/>
18 : */
19 : /**
20 : * @file src/lib/merchant_api_post-orders-ORDER_ID-refund.c
21 : * @brief Implementation of the POST /orders/$ORDER_ID/refund request
22 : * @author Christian Grothoff
23 : */
24 : #include "platform.h"
25 : #include <curl/curl.h>
26 : #include <jansson.h>
27 : #include <microhttpd.h> /* just for HTTP status codes */
28 : #include <gnunet/gnunet_util_lib.h>
29 : #include <gnunet/gnunet_curl_lib.h>
30 : #include <taler/merchant/post-orders-ORDER_ID-refund.h>
31 : #include "merchant_api_curl_defaults.h"
32 : #include "merchant_api_common.h"
33 : #include <taler/taler_json_lib.h>
34 : #include <taler/taler_curl_lib.h>
35 : #include <taler/taler_signatures.h>
36 :
37 :
38 : /**
39 : * Maximum number of refunds we return.
40 : */
41 : #define MAX_REFUNDS 1024
42 :
43 :
44 : /**
45 : * Handle for a POST /orders/$ORDER_ID/refund operation.
46 : */
47 : struct TALER_MERCHANT_PostOrdersRefundHandle
48 : {
49 : /**
50 : * Base URL of the merchant backend.
51 : */
52 : char *base_url;
53 :
54 : /**
55 : * The full URL for this request.
56 : */
57 : char *url;
58 :
59 : /**
60 : * Handle for the request.
61 : */
62 : struct GNUNET_CURL_Job *job;
63 :
64 : /**
65 : * Function to call with the result.
66 : */
67 : TALER_MERCHANT_PostOrdersRefundCallback cb;
68 :
69 : /**
70 : * Closure for @a cb.
71 : */
72 : TALER_MERCHANT_POST_ORDERS_REFUND_RESULT_CLOSURE *cb_cls;
73 :
74 : /**
75 : * Reference to the execution context.
76 : */
77 : struct GNUNET_CURL_Context *ctx;
78 :
79 : /**
80 : * Minor context that holds body and headers.
81 : */
82 : struct TALER_CURL_PostContext post_ctx;
83 :
84 : /**
85 : * Order identifier.
86 : */
87 : char *order_id;
88 :
89 : /**
90 : * Hash of the contract terms.
91 : */
92 : struct TALER_PrivateContractHashP h_contract_terms;
93 : };
94 :
95 :
96 : /**
97 : * Function called when we're done processing the
98 : * HTTP POST /orders/$ORDER_ID/refund request.
99 : *
100 : * @param cls the `struct TALER_MERCHANT_PostOrdersRefundHandle`
101 : * @param response_code HTTP response code, 0 on error
102 : * @param response response body, NULL if not in JSON
103 : */
104 : static void
105 2 : handle_refund_finished (void *cls,
106 : long response_code,
107 : const void *response)
108 : {
109 2 : struct TALER_MERCHANT_PostOrdersRefundHandle *porh = cls;
110 2 : const json_t *json = response;
111 2 : struct TALER_MERCHANT_PostOrdersRefundResponse orr = {
112 2 : .hr.http_status = (unsigned int) response_code,
113 : .hr.reply = json
114 : };
115 :
116 2 : porh->job = NULL;
117 2 : GNUNET_log (GNUNET_ERROR_TYPE_INFO,
118 : "POST /orders/$ID/refund completed with response code %u\n",
119 : (unsigned int) response_code);
120 2 : switch (response_code)
121 : {
122 0 : case 0:
123 0 : orr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
124 0 : break;
125 2 : case MHD_HTTP_OK:
126 : {
127 : const json_t *refunds;
128 : unsigned int refund_len;
129 : struct GNUNET_JSON_Specification spec[] = {
130 2 : GNUNET_JSON_spec_array_const (
131 : "refunds",
132 : &refunds),
133 2 : TALER_JSON_spec_amount_any (
134 : "refund_amount",
135 : &orr.details.ok.refund_amount),
136 2 : GNUNET_JSON_spec_fixed_auto (
137 : "merchant_pub",
138 : &orr.details.ok.merchant_pub),
139 2 : GNUNET_JSON_spec_end ()
140 : };
141 :
142 2 : if (GNUNET_OK !=
143 2 : GNUNET_JSON_parse (json,
144 : spec,
145 : NULL, NULL))
146 : {
147 0 : GNUNET_break_op (0);
148 0 : orr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
149 0 : orr.hr.http_status = 0;
150 0 : break;
151 : }
152 2 : refund_len = (unsigned int) json_array_size (refunds);
153 2 : if ( (json_array_size (refunds) != (size_t) refund_len) ||
154 : (refund_len > MAX_REFUNDS) )
155 : {
156 0 : GNUNET_break (0);
157 0 : orr.hr.ec = TALER_EC_GENERIC_ALLOCATION_FAILURE;
158 0 : orr.hr.http_status = 0;
159 0 : break;
160 : }
161 2 : {
162 2 : struct TALER_MERCHANT_PostOrdersRefundDetail rds[GNUNET_NZL (
163 : refund_len)];
164 :
165 2 : memset (rds,
166 : 0,
167 : sizeof (rds));
168 6 : for (unsigned int i = 0; i < refund_len; i++)
169 : {
170 4 : struct TALER_MERCHANT_PostOrdersRefundDetail *rd = &rds[i];
171 4 : const json_t *jrefund = json_array_get (refunds,
172 : i);
173 : const char *refund_status_type;
174 : uint32_t exchange_status;
175 4 : uint32_t eec = 0;
176 : struct GNUNET_JSON_Specification espec[] = {
177 4 : GNUNET_JSON_spec_string ("type",
178 : &refund_status_type),
179 4 : GNUNET_JSON_spec_uint32 ("exchange_status",
180 : &exchange_status),
181 4 : GNUNET_JSON_spec_uint64 ("rtransaction_id",
182 : &rd->rtransaction_id),
183 4 : GNUNET_JSON_spec_fixed_auto ("coin_pub",
184 : &rd->coin_pub),
185 4 : TALER_JSON_spec_amount_any ("refund_amount",
186 : &rd->refund_amount),
187 4 : GNUNET_JSON_spec_mark_optional (
188 : GNUNET_JSON_spec_object_const ("exchange_reply",
189 : &rd->exchange_reply),
190 : NULL),
191 4 : GNUNET_JSON_spec_mark_optional (
192 : GNUNET_JSON_spec_uint32 ("exchange_code",
193 : &eec),
194 : NULL),
195 4 : GNUNET_JSON_spec_end ()
196 : };
197 :
198 4 : if (GNUNET_OK !=
199 4 : GNUNET_JSON_parse (jrefund,
200 : espec,
201 : NULL, NULL))
202 : {
203 0 : GNUNET_break_op (0);
204 0 : orr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
205 0 : orr.hr.http_status = 0;
206 0 : goto finish;
207 : }
208 :
209 4 : rd->exchange_http_status = exchange_status;
210 4 : rd->ec = (enum TALER_ErrorCode) eec;
211 4 : switch (exchange_status)
212 : {
213 4 : case MHD_HTTP_OK:
214 : {
215 : struct GNUNET_JSON_Specification rspec[] = {
216 4 : GNUNET_JSON_spec_fixed_auto ("exchange_sig",
217 : &rd->exchange_sig),
218 4 : GNUNET_JSON_spec_fixed_auto ("exchange_pub",
219 : &rd->exchange_pub),
220 4 : GNUNET_JSON_spec_end ()
221 : };
222 :
223 4 : if (GNUNET_OK !=
224 4 : GNUNET_JSON_parse (jrefund,
225 : rspec,
226 : NULL,
227 : NULL))
228 : {
229 0 : GNUNET_break_op (0);
230 0 : orr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
231 0 : orr.hr.http_status = 0;
232 0 : goto finish;
233 : }
234 4 : if (0 != strcmp ("success",
235 : refund_status_type))
236 : {
237 0 : GNUNET_break_op (0);
238 0 : orr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
239 0 : orr.hr.http_status = 0;
240 0 : goto finish;
241 : }
242 : }
243 4 : break;
244 0 : default:
245 0 : if (0 != strcmp ("failure",
246 : refund_status_type))
247 : {
248 0 : GNUNET_break_op (0);
249 0 : orr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
250 0 : orr.hr.http_status = 0;
251 0 : goto finish;
252 : }
253 : }
254 : }
255 :
256 2 : orr.details.ok.refunds = rds;
257 2 : orr.details.ok.num_refunds = refund_len;
258 2 : porh->cb (porh->cb_cls,
259 : &orr);
260 2 : TALER_MERCHANT_post_orders_refund_cancel (porh);
261 2 : return;
262 : }
263 : }
264 : break;
265 0 : case MHD_HTTP_NO_CONTENT:
266 0 : break;
267 0 : case MHD_HTTP_FORBIDDEN:
268 0 : orr.hr.ec = TALER_JSON_get_error_code (json);
269 0 : orr.hr.hint = TALER_JSON_get_error_hint (json);
270 0 : break;
271 0 : case MHD_HTTP_NOT_FOUND:
272 0 : orr.hr.ec = TALER_JSON_get_error_code (json);
273 0 : orr.hr.hint = TALER_JSON_get_error_hint (json);
274 0 : break;
275 0 : case MHD_HTTP_GONE:
276 0 : orr.hr.ec = TALER_JSON_get_error_code (json);
277 0 : orr.hr.hint = TALER_JSON_get_error_hint (json);
278 0 : break;
279 0 : case MHD_HTTP_CONTENT_TOO_LARGE:
280 0 : orr.hr.ec = TALER_JSON_get_error_code (json);
281 0 : orr.hr.hint = TALER_JSON_get_error_hint (json);
282 0 : break;
283 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
284 0 : orr.hr.ec = TALER_JSON_get_error_code (json);
285 0 : orr.hr.hint = TALER_JSON_get_error_hint (json);
286 0 : break;
287 0 : default:
288 0 : GNUNET_break_op (0);
289 0 : TALER_MERCHANT_parse_error_details_ (json,
290 : response_code,
291 : &orr.hr);
292 0 : break;
293 : }
294 0 : finish:
295 0 : porh->cb (porh->cb_cls,
296 : &orr);
297 0 : TALER_MERCHANT_post_orders_refund_cancel (porh);
298 : }
299 :
300 :
301 : struct TALER_MERCHANT_PostOrdersRefundHandle *
302 2 : TALER_MERCHANT_post_orders_refund_create (
303 : struct GNUNET_CURL_Context *ctx,
304 : const char *url,
305 : const char *order_id,
306 : const struct TALER_PrivateContractHashP *h_contract_terms)
307 : {
308 : struct TALER_MERCHANT_PostOrdersRefundHandle *porh;
309 :
310 2 : porh = GNUNET_new (struct TALER_MERCHANT_PostOrdersRefundHandle);
311 2 : porh->ctx = ctx;
312 2 : porh->base_url = GNUNET_strdup (url);
313 2 : porh->order_id = GNUNET_strdup (order_id);
314 2 : porh->h_contract_terms = *h_contract_terms;
315 2 : return porh;
316 : }
317 :
318 :
319 : enum TALER_ErrorCode
320 2 : TALER_MERCHANT_post_orders_refund_start (
321 : struct TALER_MERCHANT_PostOrdersRefundHandle *porh,
322 : TALER_MERCHANT_PostOrdersRefundCallback cb,
323 : TALER_MERCHANT_POST_ORDERS_REFUND_RESULT_CLOSURE *cb_cls)
324 : {
325 : json_t *req_obj;
326 : CURL *eh;
327 :
328 2 : porh->cb = cb;
329 2 : porh->cb_cls = cb_cls;
330 : {
331 : char *path;
332 :
333 2 : GNUNET_asprintf (&path,
334 : "orders/%s/refund",
335 : porh->order_id);
336 2 : porh->url = TALER_url_join (porh->base_url,
337 : path,
338 : NULL);
339 2 : GNUNET_free (path);
340 : }
341 2 : if (NULL == porh->url)
342 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
343 2 : req_obj = GNUNET_JSON_PACK (
344 : GNUNET_JSON_pack_data_auto ("h_contract",
345 : &porh->h_contract_terms));
346 2 : eh = TALER_MERCHANT_curl_easy_get_ (porh->url);
347 4 : if ( (NULL == eh) ||
348 : (GNUNET_OK !=
349 2 : TALER_curl_easy_post (&porh->post_ctx,
350 : eh,
351 : req_obj)) )
352 : {
353 0 : GNUNET_break (0);
354 0 : json_decref (req_obj);
355 0 : if (NULL != eh)
356 0 : curl_easy_cleanup (eh);
357 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
358 : }
359 2 : json_decref (req_obj);
360 4 : porh->job = GNUNET_CURL_job_add2 (porh->ctx,
361 : eh,
362 2 : porh->post_ctx.headers,
363 : &handle_refund_finished,
364 : porh);
365 2 : if (NULL == porh->job)
366 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
367 2 : return TALER_EC_NONE;
368 : }
369 :
370 :
371 : void
372 2 : TALER_MERCHANT_post_orders_refund_cancel (
373 : struct TALER_MERCHANT_PostOrdersRefundHandle *porh)
374 : {
375 2 : if (NULL != porh->job)
376 : {
377 0 : GNUNET_CURL_job_cancel (porh->job);
378 0 : porh->job = NULL;
379 : }
380 2 : TALER_curl_easy_post_finished (&porh->post_ctx);
381 2 : GNUNET_free (porh->order_id);
382 2 : GNUNET_free (porh->url);
383 2 : GNUNET_free (porh->base_url);
384 2 : GNUNET_free (porh);
385 2 : }
386 :
387 :
388 : /* end of merchant_api_post-orders-ORDER_ID-refund-new.c */
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