Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2014-2023 Taler Systems SA
4 :
5 : TALER is free software; you can redistribute it and/or modify it under the
6 : terms of the GNU General Public License as published by the Free Software
7 : Foundation; either version 3, 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 General Public License for more details.
12 :
13 : You should have received a copy of the GNU General Public License along with
14 : TALER; see the file COPYING. If not, see
15 : <http://www.gnu.org/licenses/>
16 : */
17 : /**
18 : * @file lib/exchange_api_transfers_get.c
19 : * @brief Implementation of the GET /transfers/ request
20 : * @author Christian Grothoff
21 : */
22 : #include "platform.h"
23 : #include <jansson.h>
24 : #include <microhttpd.h> /* just for HTTP status codes */
25 : #include <gnunet/gnunet_util_lib.h>
26 : #include <gnunet/gnunet_curl_lib.h>
27 : #include "taler_exchange_service.h"
28 : #include "taler_json_lib.h"
29 : #include "exchange_api_handle.h"
30 : #include "taler_signatures.h"
31 : #include "exchange_api_curl_defaults.h"
32 :
33 :
34 : /**
35 : * @brief A /transfers/ GET Handle
36 : */
37 : struct TALER_EXCHANGE_TransfersGetHandle
38 : {
39 :
40 : /**
41 : * The keys of the exchange this request handle will use
42 : */
43 : struct TALER_EXCHANGE_Keys *keys;
44 :
45 : /**
46 : * The url for this request.
47 : */
48 : char *url;
49 :
50 : /**
51 : * Handle for the request.
52 : */
53 : struct GNUNET_CURL_Job *job;
54 :
55 : /**
56 : * Function to call with the result.
57 : */
58 : TALER_EXCHANGE_TransfersGetCallback cb;
59 :
60 : /**
61 : * Closure for @a cb.
62 : */
63 : void *cb_cls;
64 :
65 : };
66 :
67 :
68 : /**
69 : * We got a #MHD_HTTP_OK response for the /transfers/ request.
70 : * Check that the response is well-formed and if it is, call the
71 : * callback. If not, return an error code.
72 : *
73 : * This code is very similar to
74 : * merchant_api_track_transfer.c::check_transfers_get_response_ok.
75 : * Any changes should likely be reflected there as well.
76 : *
77 : * @param wdh handle to the operation
78 : * @param json response we got
79 : * @return #GNUNET_OK if we are done and all is well,
80 : * #GNUNET_SYSERR if the response was bogus
81 : */
82 : static enum GNUNET_GenericReturnValue
83 4 : check_transfers_get_response_ok (
84 : struct TALER_EXCHANGE_TransfersGetHandle *wdh,
85 : const json_t *json)
86 : {
87 : const json_t *details_j;
88 : struct TALER_Amount total_expected;
89 : struct TALER_MerchantPublicKeyP merchant_pub;
90 4 : struct TALER_EXCHANGE_TransfersGetResponse tgr = {
91 : .hr.reply = json,
92 : .hr.http_status = MHD_HTTP_OK
93 : };
94 4 : struct TALER_EXCHANGE_TransferData *td
95 : = &tgr.details.ok.td;
96 : struct GNUNET_JSON_Specification spec[] = {
97 4 : TALER_JSON_spec_amount_any ("total",
98 : &td->total_amount),
99 4 : TALER_JSON_spec_amount_any ("wire_fee",
100 : &td->wire_fee),
101 4 : GNUNET_JSON_spec_fixed_auto ("merchant_pub",
102 : &merchant_pub),
103 4 : GNUNET_JSON_spec_fixed_auto ("h_payto",
104 : &td->h_payto),
105 4 : GNUNET_JSON_spec_timestamp ("execution_time",
106 : &td->execution_time),
107 4 : GNUNET_JSON_spec_array_const ("deposits",
108 : &details_j),
109 4 : GNUNET_JSON_spec_fixed_auto ("exchange_sig",
110 : &td->exchange_sig),
111 4 : GNUNET_JSON_spec_fixed_auto ("exchange_pub",
112 : &td->exchange_pub),
113 4 : GNUNET_JSON_spec_end ()
114 : };
115 :
116 4 : if (GNUNET_OK !=
117 4 : GNUNET_JSON_parse (json,
118 : spec,
119 : NULL, NULL))
120 : {
121 0 : GNUNET_break_op (0);
122 0 : return GNUNET_SYSERR;
123 : }
124 4 : if (GNUNET_OK !=
125 4 : TALER_amount_set_zero (td->total_amount.currency,
126 : &total_expected))
127 : {
128 0 : GNUNET_break_op (0);
129 0 : return GNUNET_SYSERR;
130 : }
131 4 : if (GNUNET_OK !=
132 4 : TALER_EXCHANGE_test_signing_key (
133 4 : wdh->keys,
134 4 : &td->exchange_pub))
135 : {
136 0 : GNUNET_break_op (0);
137 0 : return GNUNET_SYSERR;
138 : }
139 4 : td->details_length = json_array_size (details_j);
140 : {
141 : struct GNUNET_HashContext *hash_context;
142 : struct TALER_TrackTransferDetails *details;
143 :
144 4 : details = GNUNET_new_array (td->details_length,
145 : struct TALER_TrackTransferDetails);
146 4 : td->details = details;
147 4 : hash_context = GNUNET_CRYPTO_hash_context_start ();
148 21 : for (unsigned int i = 0; i<td->details_length; i++)
149 : {
150 17 : struct TALER_TrackTransferDetails *detail = &details[i];
151 17 : struct json_t *detail_j = json_array_get (details_j, i);
152 : struct GNUNET_JSON_Specification spec_detail[] = {
153 17 : GNUNET_JSON_spec_fixed_auto ("h_contract_terms",
154 : &detail->h_contract_terms),
155 17 : GNUNET_JSON_spec_fixed_auto ("coin_pub", &detail->coin_pub),
156 17 : TALER_JSON_spec_amount ("deposit_value",
157 : total_expected.currency,
158 : &detail->coin_value),
159 17 : TALER_JSON_spec_amount ("deposit_fee",
160 : total_expected.currency,
161 : &detail->coin_fee),
162 17 : GNUNET_JSON_spec_mark_optional (
163 : TALER_JSON_spec_amount ("refund_total",
164 : total_expected.currency,
165 : &detail->refund_total),
166 : NULL),
167 17 : GNUNET_JSON_spec_end ()
168 : };
169 :
170 17 : GNUNET_assert (GNUNET_OK ==
171 : TALER_amount_set_zero (td->total_amount.currency,
172 : &detail->refund_total));
173 17 : if ( (GNUNET_OK !=
174 17 : GNUNET_JSON_parse (detail_j,
175 : spec_detail,
176 17 : NULL, NULL)) ||
177 : (0 >
178 17 : TALER_amount_add (&total_expected,
179 : &total_expected,
180 34 : &detail->coin_value)) ||
181 : (0 >
182 17 : TALER_amount_subtract (&total_expected,
183 : &total_expected,
184 17 : &detail->coin_fee)) )
185 : {
186 0 : GNUNET_break_op (0);
187 0 : GNUNET_CRYPTO_hash_context_abort (hash_context);
188 0 : GNUNET_free (details);
189 0 : return GNUNET_SYSERR;
190 : }
191 : /* build up big hash for signature checking later */
192 17 : TALER_exchange_online_wire_deposit_append (
193 : hash_context,
194 17 : &detail->h_contract_terms,
195 : td->execution_time,
196 17 : &detail->coin_pub,
197 17 : &detail->coin_value,
198 17 : &detail->coin_fee);
199 : }
200 : /* Check signature */
201 : {
202 : struct GNUNET_HashCode h_details;
203 :
204 4 : GNUNET_CRYPTO_hash_context_finish (hash_context,
205 : &h_details);
206 4 : if (GNUNET_OK !=
207 4 : TALER_exchange_online_wire_deposit_verify (
208 4 : &td->total_amount,
209 4 : &td->wire_fee,
210 : &merchant_pub,
211 4 : &td->h_payto,
212 : &h_details,
213 4 : &td->exchange_pub,
214 4 : &td->exchange_sig))
215 : {
216 0 : GNUNET_break_op (0);
217 0 : GNUNET_free (details);
218 0 : return GNUNET_SYSERR;
219 : }
220 : }
221 :
222 4 : if (0 >
223 4 : TALER_amount_subtract (&total_expected,
224 : &total_expected,
225 4 : &td->wire_fee))
226 : {
227 0 : GNUNET_break_op (0);
228 0 : GNUNET_free (details);
229 0 : return GNUNET_SYSERR;
230 : }
231 4 : if (0 !=
232 4 : TALER_amount_cmp (&total_expected,
233 4 : &td->total_amount))
234 : {
235 0 : GNUNET_break_op (0);
236 0 : GNUNET_free (details);
237 0 : return GNUNET_SYSERR;
238 : }
239 4 : wdh->cb (wdh->cb_cls,
240 : &tgr);
241 4 : GNUNET_free (details);
242 : }
243 4 : return GNUNET_OK;
244 : }
245 :
246 :
247 : /**
248 : * Function called when we're done processing the
249 : * HTTP /transfers/ request.
250 : *
251 : * @param cls the `struct TALER_EXCHANGE_TransfersGetHandle`
252 : * @param response_code HTTP response code, 0 on error
253 : * @param response parsed JSON result, NULL on error
254 : */
255 : static void
256 6 : handle_transfers_get_finished (void *cls,
257 : long response_code,
258 : const void *response)
259 : {
260 6 : struct TALER_EXCHANGE_TransfersGetHandle *wdh = cls;
261 6 : const json_t *j = response;
262 6 : struct TALER_EXCHANGE_TransfersGetResponse tgr = {
263 : .hr.reply = j,
264 6 : .hr.http_status = (unsigned int) response_code
265 : };
266 :
267 6 : wdh->job = NULL;
268 6 : switch (response_code)
269 : {
270 0 : case 0:
271 0 : tgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
272 0 : break;
273 4 : case MHD_HTTP_OK:
274 4 : if (GNUNET_OK ==
275 4 : check_transfers_get_response_ok (wdh,
276 : j))
277 : {
278 4 : TALER_EXCHANGE_transfers_get_cancel (wdh);
279 4 : return;
280 : }
281 0 : GNUNET_break_op (0);
282 0 : tgr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
283 0 : tgr.hr.http_status = 0;
284 0 : break;
285 0 : case MHD_HTTP_BAD_REQUEST:
286 : /* This should never happen, either us or the exchange is buggy
287 : (or API version conflict); just pass JSON reply to the application */
288 0 : tgr.hr.ec = TALER_JSON_get_error_code (j);
289 0 : tgr.hr.hint = TALER_JSON_get_error_hint (j);
290 0 : break;
291 0 : case MHD_HTTP_FORBIDDEN:
292 : /* Nothing really to verify, exchange says one of the signatures is
293 : invalid; as we checked them, this should never happen, we
294 : should pass the JSON reply to the application */
295 0 : tgr.hr.ec = TALER_JSON_get_error_code (j);
296 0 : tgr.hr.hint = TALER_JSON_get_error_hint (j);
297 0 : break;
298 2 : case MHD_HTTP_NOT_FOUND:
299 : /* Exchange does not know about transaction;
300 : we should pass the reply to the application */
301 2 : tgr.hr.ec = TALER_JSON_get_error_code (j);
302 2 : tgr.hr.hint = TALER_JSON_get_error_hint (j);
303 2 : break;
304 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
305 : /* Server had an internal issue; we should retry, but this API
306 : leaves this to the application */
307 0 : tgr.hr.ec = TALER_JSON_get_error_code (j);
308 0 : tgr.hr.hint = TALER_JSON_get_error_hint (j);
309 0 : break;
310 0 : default:
311 : /* unexpected response code */
312 0 : GNUNET_break_op (0);
313 0 : tgr.hr.ec = TALER_JSON_get_error_code (j);
314 0 : tgr.hr.hint = TALER_JSON_get_error_hint (j);
315 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
316 : "Unexpected response code %u/%d for transfers get\n",
317 : (unsigned int) response_code,
318 : (int) tgr.hr.ec);
319 0 : break;
320 : }
321 2 : wdh->cb (wdh->cb_cls,
322 : &tgr);
323 2 : TALER_EXCHANGE_transfers_get_cancel (wdh);
324 : }
325 :
326 :
327 : struct TALER_EXCHANGE_TransfersGetHandle *
328 6 : TALER_EXCHANGE_transfers_get (
329 : struct GNUNET_CURL_Context *ctx,
330 : const char *url,
331 : struct TALER_EXCHANGE_Keys *keys,
332 : const struct TALER_WireTransferIdentifierRawP *wtid,
333 : TALER_EXCHANGE_TransfersGetCallback cb,
334 : void *cb_cls)
335 : {
336 : struct TALER_EXCHANGE_TransfersGetHandle *wdh;
337 : CURL *eh;
338 : char arg_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2 + 32];
339 :
340 6 : wdh = GNUNET_new (struct TALER_EXCHANGE_TransfersGetHandle);
341 6 : wdh->cb = cb;
342 6 : wdh->cb_cls = cb_cls;
343 :
344 : {
345 : char wtid_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2];
346 : char *end;
347 :
348 6 : end = GNUNET_STRINGS_data_to_string (wtid,
349 : sizeof (struct
350 : TALER_WireTransferIdentifierRawP),
351 : wtid_str,
352 : sizeof (wtid_str));
353 6 : *end = '\0';
354 6 : GNUNET_snprintf (arg_str,
355 : sizeof (arg_str),
356 : "transfers/%s",
357 : wtid_str);
358 : }
359 6 : wdh->url = TALER_url_join (url,
360 : arg_str,
361 : NULL);
362 6 : if (NULL == wdh->url)
363 : {
364 0 : GNUNET_free (wdh);
365 0 : return NULL;
366 : }
367 6 : eh = TALER_EXCHANGE_curl_easy_get_ (wdh->url);
368 6 : if (NULL == eh)
369 : {
370 0 : GNUNET_break (0);
371 0 : GNUNET_free (wdh->url);
372 0 : GNUNET_free (wdh);
373 0 : return NULL;
374 : }
375 6 : wdh->keys = TALER_EXCHANGE_keys_incref (keys);
376 6 : wdh->job = GNUNET_CURL_job_add_with_ct_json (ctx,
377 : eh,
378 : &handle_transfers_get_finished,
379 : wdh);
380 6 : return wdh;
381 : }
382 :
383 :
384 : /**
385 : * Cancel wire deposits request. This function cannot be used on a request
386 : * handle if a response is already served for it.
387 : *
388 : * @param wdh the wire deposits request handle
389 : */
390 : void
391 6 : TALER_EXCHANGE_transfers_get_cancel (
392 : struct TALER_EXCHANGE_TransfersGetHandle *wdh)
393 : {
394 6 : if (NULL != wdh->job)
395 : {
396 0 : GNUNET_CURL_job_cancel (wdh->job);
397 0 : wdh->job = NULL;
398 : }
399 6 : GNUNET_free (wdh->url);
400 6 : TALER_EXCHANGE_keys_decref (wdh->keys);
401 6 : GNUNET_free (wdh);
402 6 : }
403 :
404 :
405 : /* end of exchange_api_transfers_get.c */
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