Line data Source code
1 : /*
2 : This file is part of GNU Taler
3 : Copyright (C) 2017--2023 Taler Systems SA
4 :
5 : Taler is free software; you can redistribute it and/or
6 : modify it under the terms of the GNU General Public License
7 : as published by the Free Software Foundation; either version 3,
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 General Public License for more details.
14 :
15 : You should have received a copy of the GNU General Public
16 : License along with Taler; see the file COPYING. If not,
17 : see <http://www.gnu.org/licenses/>
18 : */
19 : /**
20 : * @file bank/mb_credit.c
21 : * @brief Implementation of the /history
22 : * requests of the libeufin's Taler merchant facade
23 : * @author Christian Grothoff
24 : * @author Marcello Stanisci
25 : */
26 : #include "platform.h"
27 : #include "mb_common.h"
28 : #include <microhttpd.h> /* just for HTTP status codes */
29 :
30 :
31 : /**
32 : * @brief A /history Handle
33 : */
34 : struct TALER_MERCHANT_BANK_CreditHistoryHandle
35 : {
36 :
37 : /**
38 : * The url for this request.
39 : */
40 : char *request_url;
41 :
42 : /**
43 : * Handle for the request.
44 : */
45 : struct GNUNET_CURL_Job *job;
46 :
47 : /**
48 : * Function to call with the result.
49 : */
50 : TALER_MERCHANT_BANK_CreditHistoryCallback hcb;
51 :
52 : /**
53 : * Closure for @a cb.
54 : */
55 : void *hcb_cls;
56 : };
57 :
58 :
59 : /**
60 : * Parse history given in JSON format and invoke the callback on each item.
61 : *
62 : * @param hh handle to the account history request
63 : * @param history JSON array with the history
64 : * @return #GNUNET_OK if history was valid and @a rhistory and @a balance
65 : * were set,
66 : * #GNUNET_SYSERR if there was a protocol violation in @a history
67 : */
68 : static enum GNUNET_GenericReturnValue
69 4 : parse_account_history (struct TALER_MERCHANT_BANK_CreditHistoryHandle *hh,
70 : const json_t *history)
71 : {
72 : const json_t *history_array;
73 : struct TALER_FullPayto credit_account_uri;
74 : struct GNUNET_JSON_Specification spec[] = {
75 4 : GNUNET_JSON_spec_array_const ("incoming_transactions",
76 : &history_array),
77 4 : TALER_JSON_spec_full_payto_uri ("credit_account",
78 : &credit_account_uri),
79 4 : GNUNET_JSON_spec_end ()
80 : };
81 :
82 4 : if (GNUNET_OK !=
83 4 : GNUNET_JSON_parse (history,
84 : spec,
85 : NULL,
86 : NULL))
87 : {
88 0 : GNUNET_break_op (0);
89 0 : return GNUNET_SYSERR;
90 : }
91 8 : for (unsigned int i = 0; i<json_array_size (history_array); i++)
92 : {
93 : struct TALER_MERCHANT_BANK_CreditDetails td;
94 : uint64_t row_id;
95 : struct GNUNET_JSON_Specification hist_spec[] = {
96 4 : TALER_JSON_spec_amount_any ("amount",
97 : &td.amount),
98 4 : GNUNET_JSON_spec_timestamp ("date",
99 : &td.execution_date),
100 4 : GNUNET_JSON_spec_uint64 ("row_id",
101 : &row_id),
102 4 : GNUNET_JSON_spec_string ("subject",
103 : &td.wire_subject),
104 4 : TALER_JSON_spec_full_payto_uri ("debit_account",
105 : &td.debit_account_uri),
106 4 : GNUNET_JSON_spec_end ()
107 : };
108 4 : json_t *transaction = json_array_get (history_array,
109 : i);
110 :
111 4 : if (GNUNET_OK !=
112 4 : GNUNET_JSON_parse (transaction,
113 : hist_spec,
114 : NULL, NULL))
115 : {
116 0 : GNUNET_break_op (0);
117 0 : return GNUNET_SYSERR;
118 : }
119 4 : td.credit_account_uri = credit_account_uri;
120 4 : if (GNUNET_OK !=
121 4 : hh->hcb (hh->hcb_cls,
122 : MHD_HTTP_OK,
123 : TALER_EC_NONE,
124 : row_id,
125 : &td))
126 : {
127 0 : hh->hcb = NULL;
128 0 : GNUNET_JSON_parse_free (hist_spec);
129 0 : return GNUNET_OK;
130 : }
131 4 : GNUNET_JSON_parse_free (hist_spec);
132 : }
133 4 : return GNUNET_OK;
134 : }
135 :
136 :
137 : /**
138 : * Function called when we're done processing the
139 : * HTTP "/history" request.
140 : *
141 : * @param cls the `struct TALER_MERCHANT_BANK_CreditHistoryHandle`
142 : * @param response_code HTTP response code, 0 on error
143 : * @param response parsed JSON result, NULL on error
144 : */
145 : static void
146 8 : handle_credit_history_finished (void *cls,
147 : long response_code,
148 : const void *response)
149 : {
150 8 : struct TALER_MERCHANT_BANK_CreditHistoryHandle *hh = cls;
151 8 : const json_t *j = response;
152 : enum TALER_ErrorCode ec;
153 :
154 8 : hh->job = NULL;
155 8 : switch (response_code)
156 : {
157 0 : case 0:
158 0 : ec = TALER_EC_GENERIC_INVALID_RESPONSE;
159 0 : break;
160 4 : case MHD_HTTP_OK:
161 4 : if (GNUNET_OK !=
162 4 : parse_account_history (hh,
163 : j))
164 : {
165 0 : GNUNET_break_op (0);
166 0 : response_code = 0;
167 0 : ec = TALER_EC_GENERIC_INVALID_RESPONSE;
168 0 : break;
169 : }
170 4 : response_code = MHD_HTTP_NO_CONTENT; /* signal end of list */
171 4 : ec = TALER_EC_NONE;
172 4 : break;
173 4 : case MHD_HTTP_NO_CONTENT:
174 4 : ec = TALER_EC_NONE;
175 4 : break;
176 0 : case MHD_HTTP_BAD_REQUEST:
177 : /* This should never happen, either us or the bank is buggy
178 : (or API version conflict); just pass JSON reply to the application */
179 0 : GNUNET_break_op (0);
180 0 : ec = TALER_JSON_get_error_code (j);
181 0 : break;
182 0 : case MHD_HTTP_UNAUTHORIZED:
183 : /* Nothing really to verify, bank says the HTTP Authentication
184 : failed. May happen if HTTP authentication is used and the
185 : user supplied a wrong username/password combination. */
186 0 : ec = TALER_JSON_get_error_code (j);
187 0 : break;
188 0 : case MHD_HTTP_NOT_FOUND:
189 : /* Nothing really to verify: the bank is either unaware
190 : of the endpoint (not a bank), or of the account.
191 : We should pass the JSON (?) reply to the application */
192 0 : ec = TALER_JSON_get_error_code (j);
193 0 : break;
194 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
195 : /* Server had an internal issue; we should retry, but this API
196 : leaves this to the application */
197 0 : ec = TALER_JSON_get_error_code (j);
198 0 : break;
199 0 : default:
200 : /* unexpected response code */
201 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
202 : "Unexpected response code %u\n",
203 : (unsigned int) response_code);
204 0 : ec = TALER_JSON_get_error_code (j);
205 0 : break;
206 : }
207 8 : if (NULL != hh->hcb)
208 8 : hh->hcb (hh->hcb_cls,
209 : response_code,
210 : ec,
211 : 0LLU,
212 : NULL);
213 8 : TALER_MERCHANT_BANK_credit_history_cancel (hh);
214 8 : }
215 :
216 :
217 : struct TALER_MERCHANT_BANK_CreditHistoryHandle *
218 8 : TALER_MERCHANT_BANK_credit_history (
219 : struct GNUNET_CURL_Context *ctx,
220 : const struct TALER_MERCHANT_BANK_AuthenticationData *auth,
221 : uint64_t start_row,
222 : int64_t num_results,
223 : struct GNUNET_TIME_Relative timeout,
224 : TALER_MERCHANT_BANK_CreditHistoryCallback hres_cb,
225 : void *hres_cb_cls)
226 : {
227 : char url[128];
228 : struct TALER_MERCHANT_BANK_CreditHistoryHandle *hh;
229 : CURL *eh;
230 : unsigned long long tms;
231 :
232 8 : if (0 == num_results)
233 : {
234 0 : GNUNET_break (0);
235 0 : return NULL;
236 : }
237 :
238 16 : tms = (unsigned long long) (timeout.rel_value_us
239 8 : / GNUNET_TIME_UNIT_MILLISECONDS.rel_value_us);
240 8 : if ( ( (UINT64_MAX == start_row) &&
241 8 : (0 > num_results) ) ||
242 2 : ( (0 == start_row) &&
243 : (0 < num_results) ) )
244 : {
245 2 : if ( (0 < num_results) &&
246 2 : (! GNUNET_TIME_relative_is_zero (timeout)) )
247 0 : GNUNET_snprintf (url,
248 : sizeof (url),
249 : "history?delta=%lld&long_poll_ms=%llu",
250 : (long long) num_results,
251 : tms);
252 : else
253 2 : GNUNET_snprintf (url,
254 : sizeof (url),
255 : "history?delta=%lld",
256 : (long long) num_results);
257 : }
258 : else
259 : {
260 6 : if ( (0 < num_results) &&
261 6 : (! GNUNET_TIME_relative_is_zero (timeout)) )
262 0 : GNUNET_snprintf (url,
263 : sizeof (url),
264 : "history?delta=%lld&start=%llu&long_poll_ms=%llu",
265 : (long long) num_results,
266 : (unsigned long long) start_row,
267 : tms);
268 : else
269 6 : GNUNET_snprintf (url,
270 : sizeof (url),
271 : "history?delta=%lld&start=%llu",
272 : (long long) num_results,
273 : (unsigned long long) start_row);
274 : }
275 8 : hh = GNUNET_new (struct TALER_MERCHANT_BANK_CreditHistoryHandle);
276 8 : hh->hcb = hres_cb;
277 8 : hh->hcb_cls = hres_cb_cls;
278 8 : hh->request_url = TALER_url_join (auth->wire_gateway_url,
279 : url,
280 : NULL);
281 8 : if (NULL == hh->request_url)
282 : {
283 0 : GNUNET_free (hh);
284 0 : GNUNET_break (0);
285 0 : return NULL;
286 : }
287 8 : GNUNET_log (GNUNET_ERROR_TYPE_INFO,
288 : "Requesting credit history at `%s'\n",
289 : hh->request_url);
290 8 : eh = curl_easy_init ();
291 16 : if ( (NULL == eh) ||
292 : (GNUNET_OK !=
293 8 : TALER_MERCHANT_BANK_setup_auth_ (eh,
294 8 : auth)) ||
295 : (CURLE_OK !=
296 8 : curl_easy_setopt (eh,
297 : CURLOPT_URL,
298 : hh->request_url)) )
299 : {
300 0 : GNUNET_break (0);
301 0 : TALER_MERCHANT_BANK_credit_history_cancel (hh);
302 0 : if (NULL != eh)
303 0 : curl_easy_cleanup (eh);
304 0 : return NULL;
305 : }
306 8 : if (0 != tms)
307 : {
308 0 : GNUNET_break (CURLE_OK ==
309 : curl_easy_setopt (eh,
310 : CURLOPT_TIMEOUT_MS,
311 : (long) (tms + 100L)));
312 : }
313 : #if DEBUG
314 : GNUNET_break (CURLE_OK ==
315 : curl_easy_setopt (eh,
316 : CURLOPT_VERBOSE,
317 : 1L));
318 : #endif
319 8 : hh->job = GNUNET_CURL_job_add2 (ctx,
320 : eh,
321 : NULL,
322 : &handle_credit_history_finished,
323 : hh);
324 8 : return hh;
325 : }
326 :
327 :
328 : void
329 8 : TALER_MERCHANT_BANK_credit_history_cancel (
330 : struct TALER_MERCHANT_BANK_CreditHistoryHandle *hh)
331 : {
332 8 : if (NULL != hh->job)
333 : {
334 0 : GNUNET_CURL_job_cancel (hh->job);
335 0 : hh->job = NULL;
336 : }
337 8 : GNUNET_free (hh->request_url);
338 8 : GNUNET_free (hh);
339 8 : }
340 :
341 :
342 : /* end of mb_credit.c */
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