Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2014-2021 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_post_transfers.c
19 : * @brief Implementation of the POST /transfers request of the merchant's HTTP API
20 : * @author Marcello Stanisci
21 : * @author Christian Grothoff
22 : */
23 : #include "platform.h"
24 : #include <curl/curl.h>
25 : #include <jansson.h>
26 : #include <microhttpd.h> /* just for HTTP status codes */
27 : #include <gnunet/gnunet_util_lib.h>
28 : #include "taler_merchant_service.h"
29 : #include "merchant_api_curl_defaults.h"
30 : #include <taler/taler_curl_lib.h>
31 : #include <taler/taler_json_lib.h>
32 :
33 :
34 : /**
35 : * @brief A handle for POSTing transfer data.
36 : */
37 : struct TALER_MERCHANT_PostTransfersHandle
38 : {
39 :
40 : /**
41 : * The url for this request.
42 : */
43 : char *url;
44 :
45 : /**
46 : * Handle for the request.
47 : */
48 : struct GNUNET_CURL_Job *job;
49 :
50 : /**
51 : * Function to call with the result.
52 : */
53 : TALER_MERCHANT_PostTransfersCallback cb;
54 :
55 : /**
56 : * Closure for @a cb.
57 : */
58 : void *cb_cls;
59 :
60 : /**
61 : * Reference to the execution context.
62 : */
63 : struct GNUNET_CURL_Context *ctx;
64 :
65 : /**
66 : * Minor context that holds body and headers.
67 : */
68 : struct TALER_CURL_PostContext post_ctx;
69 :
70 : };
71 :
72 :
73 : /**
74 : * Function called when we're done processing the
75 : * HTTP POST /transfers request.
76 : *
77 : * @param cls the `struct TALER_MERCHANT_PostTransfersHandle`
78 : * @param response_code HTTP response code, 0 on error
79 : * @param response response body, NULL if not in JSON
80 : */
81 : static void
82 0 : handle_post_transfers_finished (void *cls,
83 : long response_code,
84 : const void *response)
85 : {
86 0 : struct TALER_MERCHANT_PostTransfersHandle *pth = cls;
87 0 : const json_t *json = response;
88 0 : json_t *deposit_sum = NULL;
89 0 : struct TALER_MERCHANT_HttpResponse hr = {
90 0 : .http_status = (unsigned int) response_code,
91 : .reply = json
92 : };
93 :
94 0 : pth->job = NULL;
95 0 : switch (response_code)
96 : {
97 0 : case 0:
98 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
99 0 : break;
100 0 : case MHD_HTTP_OK:
101 : {
102 : struct TALER_Amount total;
103 : struct TALER_Amount wire_fee;
104 : struct GNUNET_TIME_Timestamp execution_time;
105 : json_t *deposit_sums;
106 : struct GNUNET_JSON_Specification spec[] = {
107 0 : TALER_JSON_spec_amount_any ("total",
108 : &total),
109 0 : TALER_JSON_spec_amount_any ("wire_fee",
110 : &wire_fee),
111 0 : GNUNET_JSON_spec_timestamp ("execution_time",
112 : &execution_time),
113 0 : GNUNET_JSON_spec_json ("deposit_sums",
114 : &deposit_sums),
115 0 : GNUNET_JSON_spec_end ()
116 : };
117 :
118 0 : if (GNUNET_OK !=
119 0 : GNUNET_JSON_parse (json,
120 : spec,
121 : NULL, NULL))
122 : {
123 0 : GNUNET_break_op (0);
124 0 : hr.http_status = 0;
125 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
126 0 : break;
127 : }
128 : else
129 : {
130 : size_t deposit_sums_length;
131 : struct TALER_MERCHANT_TrackTransferDetail *details;
132 : unsigned int i;
133 : bool ok;
134 :
135 0 : if (! json_is_array (deposit_sums))
136 : {
137 0 : GNUNET_break_op (0);
138 0 : GNUNET_JSON_parse_free (spec);
139 0 : hr.http_status = 0;
140 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
141 0 : break;
142 : }
143 0 : deposit_sums_length = json_array_size (deposit_sums);
144 0 : details = GNUNET_new_array (deposit_sums_length,
145 : struct TALER_MERCHANT_TrackTransferDetail);
146 0 : ok = true;
147 0 : json_array_foreach (deposit_sums, i, deposit_sum) {
148 0 : struct TALER_MERCHANT_TrackTransferDetail *d = &details[i];
149 : struct GNUNET_JSON_Specification ispec[] = {
150 0 : GNUNET_JSON_spec_string ("order_id",
151 : &d->order_id),
152 0 : TALER_JSON_spec_amount_any ("deposit_value",
153 : &d->deposit_value),
154 0 : TALER_JSON_spec_amount_any ("deposit_fee",
155 : &d->deposit_fee),
156 0 : GNUNET_JSON_spec_end ()
157 : };
158 :
159 0 : if (GNUNET_OK !=
160 0 : GNUNET_JSON_parse (deposit_sum,
161 : ispec,
162 : NULL, NULL))
163 : {
164 0 : GNUNET_break_op (0);
165 0 : ok = false;
166 0 : break;
167 : }
168 : }
169 :
170 0 : if (! ok)
171 : {
172 0 : GNUNET_break_op (0);
173 0 : GNUNET_free (details);
174 0 : GNUNET_JSON_parse_free (spec);
175 0 : hr.http_status = 0;
176 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
177 0 : break;
178 : }
179 0 : pth->cb (pth->cb_cls,
180 : &hr,
181 : execution_time,
182 : &total,
183 : &wire_fee,
184 : deposit_sums_length,
185 : details);
186 0 : GNUNET_free (details);
187 0 : GNUNET_JSON_parse_free (spec);
188 0 : TALER_MERCHANT_transfers_post_cancel (pth);
189 0 : return;
190 : }
191 : }
192 0 : case MHD_HTTP_ACCEPTED:
193 0 : break;
194 0 : case MHD_HTTP_UNAUTHORIZED:
195 0 : hr.ec = TALER_JSON_get_error_code (json);
196 0 : hr.hint = TALER_JSON_get_error_hint (json);
197 : /* Nothing really to verify, merchant says we need to authenticate. */
198 0 : break;
199 0 : case MHD_HTTP_NOT_FOUND:
200 : /* Nothing really to verify, this should never
201 : happen, we should pass the JSON reply to the application */
202 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
203 : "Did not find any data\n");
204 0 : hr.ec = TALER_JSON_get_error_code (json);
205 0 : hr.hint = TALER_JSON_get_error_hint (json);
206 0 : break;
207 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
208 : /* Server had an internal issue; we should retry, but this API
209 : leaves this to the application */
210 0 : hr.ec = TALER_JSON_get_error_code (json);
211 0 : hr.hint = TALER_JSON_get_error_hint (json);
212 0 : break;
213 0 : case MHD_HTTP_BAD_GATEWAY:
214 : /* Exchange had an issue; we should retry, but this API
215 : leaves this to the application */
216 0 : hr.ec = TALER_JSON_get_error_code (json);
217 0 : hr.hint = TALER_JSON_get_error_hint (json);
218 : {
219 : uint32_t eec;
220 : uint32_t ehc;
221 : struct GNUNET_JSON_Specification ispec[] = {
222 0 : GNUNET_JSON_spec_uint32 ("exchange_code",
223 : &eec),
224 0 : GNUNET_JSON_spec_uint32 ("exchange_http_status",
225 : &ehc),
226 0 : GNUNET_JSON_spec_end ()
227 : };
228 :
229 0 : if (GNUNET_OK !=
230 0 : GNUNET_JSON_parse (deposit_sum,
231 : ispec,
232 : NULL, NULL))
233 : {
234 0 : GNUNET_break_op (0);
235 0 : break;
236 : }
237 : else
238 : {
239 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
240 : "Exchange returned %u/%u\n",
241 : (unsigned int) eec,
242 : (unsigned int) ehc);
243 : }
244 : }
245 0 : break;
246 0 : case MHD_HTTP_GATEWAY_TIMEOUT:
247 : /* Server had an internal issue; we should retry, but this API
248 : leaves this to the application */
249 0 : hr.ec = TALER_JSON_get_error_code (json);
250 0 : hr.hint = TALER_JSON_get_error_hint (json);
251 0 : break;
252 0 : default:
253 : /* unexpected response code */
254 0 : GNUNET_break_op (0);
255 0 : TALER_MERCHANT_parse_error_details_ (json,
256 : response_code,
257 : &hr);
258 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
259 : "Unexpected response code %u/%d\n",
260 : (unsigned int) response_code,
261 : (int) hr.ec);
262 0 : break;
263 : }
264 0 : pth->cb (pth->cb_cls,
265 : &hr,
266 0 : GNUNET_TIME_UNIT_FOREVER_TS,
267 : NULL,
268 : NULL,
269 : 0,
270 : NULL);
271 0 : TALER_MERCHANT_transfers_post_cancel (pth);
272 : }
273 :
274 :
275 : struct TALER_MERCHANT_PostTransfersHandle *
276 0 : TALER_MERCHANT_transfers_post (
277 : struct GNUNET_CURL_Context *ctx,
278 : const char *backend_url,
279 : const struct TALER_Amount *credit_amount,
280 : const struct TALER_WireTransferIdentifierRawP *wtid,
281 : const char *payto_uri,
282 : const char *exchange_url,
283 : TALER_MERCHANT_PostTransfersCallback cb,
284 : void *cb_cls)
285 : {
286 : struct TALER_MERCHANT_PostTransfersHandle *pth;
287 : CURL *eh;
288 : json_t *req;
289 :
290 0 : pth = GNUNET_new (struct TALER_MERCHANT_PostTransfersHandle);
291 0 : pth->ctx = ctx;
292 0 : pth->cb = cb;
293 0 : pth->cb_cls = cb_cls;
294 0 : pth->url = TALER_url_join (backend_url,
295 : "private/transfers",
296 : NULL);
297 0 : if (NULL == pth->url)
298 : {
299 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
300 : "Could not construct request URL.\n");
301 0 : GNUNET_free (pth);
302 0 : return NULL;
303 : }
304 0 : req = GNUNET_JSON_PACK (
305 : TALER_JSON_pack_amount ("credit_amount",
306 : credit_amount),
307 : GNUNET_JSON_pack_data_auto ("wtid",
308 : wtid),
309 : GNUNET_JSON_pack_string ("payto_uri",
310 : payto_uri),
311 : GNUNET_JSON_pack_string ("exchange_url",
312 : exchange_url));
313 0 : eh = TALER_MERCHANT_curl_easy_get_ (pth->url);
314 0 : if (GNUNET_OK !=
315 0 : TALER_curl_easy_post (&pth->post_ctx,
316 : eh,
317 : req))
318 : {
319 0 : GNUNET_break (0);
320 0 : curl_easy_cleanup (eh);
321 0 : json_decref (req);
322 0 : GNUNET_free (pth->url);
323 0 : GNUNET_free (pth);
324 0 : return NULL;
325 : }
326 0 : json_decref (req);
327 0 : pth->job = GNUNET_CURL_job_add2 (ctx,
328 : eh,
329 0 : pth->post_ctx.headers,
330 : &handle_post_transfers_finished,
331 : pth);
332 0 : return pth;
333 : }
334 :
335 :
336 : void
337 0 : TALER_MERCHANT_transfers_post_cancel (
338 : struct TALER_MERCHANT_PostTransfersHandle *pth)
339 : {
340 0 : if (NULL != pth->job)
341 : {
342 0 : GNUNET_CURL_job_cancel (pth->job);
343 0 : pth->job = NULL;
344 : }
345 0 : GNUNET_free (pth->url);
346 0 : TALER_curl_easy_post_finished (&pth->post_ctx);
347 0 : GNUNET_free (pth);
348 0 : }
349 :
350 :
351 : /* end of merchant_api_post_transfers.c */
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