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 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 connection to exchange this request handle will use
42 : */
43 : struct TALER_EXCHANGE_Handle *exchange;
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 0 : check_transfers_get_response_ok (
84 : struct TALER_EXCHANGE_TransfersGetHandle *wdh,
85 : const json_t *json)
86 : {
87 : json_t *details_j;
88 : struct TALER_EXCHANGE_TransferData td;
89 : struct TALER_Amount total_expected;
90 : struct TALER_MerchantPublicKeyP merchant_pub;
91 : struct GNUNET_JSON_Specification spec[] = {
92 0 : TALER_JSON_spec_amount_any ("total", &td.total_amount),
93 0 : TALER_JSON_spec_amount_any ("wire_fee", &td.wire_fee),
94 0 : GNUNET_JSON_spec_fixed_auto ("merchant_pub", &merchant_pub),
95 0 : GNUNET_JSON_spec_fixed_auto ("h_payto", &td.h_payto),
96 0 : GNUNET_JSON_spec_timestamp ("execution_time", &td.execution_time),
97 0 : GNUNET_JSON_spec_json ("deposits", &details_j),
98 0 : GNUNET_JSON_spec_fixed_auto ("exchange_sig", &td.exchange_sig),
99 0 : GNUNET_JSON_spec_fixed_auto ("exchange_pub", &td.exchange_pub),
100 0 : GNUNET_JSON_spec_end ()
101 : };
102 0 : struct TALER_EXCHANGE_HttpResponse hr = {
103 : .reply = json,
104 : .http_status = MHD_HTTP_OK
105 : };
106 :
107 0 : if (GNUNET_OK !=
108 0 : GNUNET_JSON_parse (json,
109 : spec,
110 : NULL, NULL))
111 : {
112 0 : GNUNET_break_op (0);
113 0 : return GNUNET_SYSERR;
114 : }
115 0 : if (GNUNET_OK !=
116 0 : TALER_amount_set_zero (td.total_amount.currency,
117 : &total_expected))
118 : {
119 0 : GNUNET_break_op (0);
120 0 : GNUNET_JSON_parse_free (spec);
121 0 : return GNUNET_SYSERR;
122 : }
123 0 : if (GNUNET_OK !=
124 0 : TALER_EXCHANGE_test_signing_key (
125 : TALER_EXCHANGE_get_keys (wdh->exchange),
126 : &td.exchange_pub))
127 : {
128 0 : GNUNET_break_op (0);
129 0 : GNUNET_JSON_parse_free (spec);
130 0 : return GNUNET_SYSERR;
131 : }
132 0 : td.details_length = json_array_size (details_j);
133 : {
134 : struct GNUNET_HashContext *hash_context;
135 : struct TALER_TrackTransferDetails *details;
136 :
137 0 : details = GNUNET_new_array (td.details_length,
138 : struct TALER_TrackTransferDetails);
139 0 : td.details = details;
140 0 : hash_context = GNUNET_CRYPTO_hash_context_start ();
141 0 : for (unsigned int i = 0; i<td.details_length; i++)
142 : {
143 0 : struct TALER_TrackTransferDetails *detail = &details[i];
144 0 : struct json_t *detail_j = json_array_get (details_j, i);
145 : struct GNUNET_JSON_Specification spec_detail[] = {
146 0 : GNUNET_JSON_spec_fixed_auto ("h_contract_terms",
147 : &detail->h_contract_terms),
148 0 : GNUNET_JSON_spec_fixed_auto ("coin_pub", &detail->coin_pub),
149 0 : TALER_JSON_spec_amount_any ("deposit_value", &detail->coin_value),
150 0 : TALER_JSON_spec_amount_any ("deposit_fee", &detail->coin_fee),
151 0 : GNUNET_JSON_spec_end ()
152 : };
153 :
154 0 : if ( (GNUNET_OK !=
155 0 : GNUNET_JSON_parse (detail_j,
156 : spec_detail,
157 0 : NULL, NULL)) ||
158 : (GNUNET_OK !=
159 0 : TALER_amount_cmp_currency (&total_expected,
160 0 : &detail->coin_value)) ||
161 : (GNUNET_OK !=
162 0 : TALER_amount_cmp_currency (&total_expected,
163 0 : &detail->coin_fee)) ||
164 : (0 >
165 0 : TALER_amount_add (&total_expected,
166 : &total_expected,
167 0 : &detail->coin_value)) ||
168 : (0 >
169 0 : TALER_amount_subtract (&total_expected,
170 : &total_expected,
171 0 : &detail->coin_fee)) )
172 : {
173 0 : GNUNET_break_op (0);
174 0 : GNUNET_CRYPTO_hash_context_abort (hash_context);
175 0 : GNUNET_JSON_parse_free (spec);
176 0 : GNUNET_free (details);
177 0 : return GNUNET_SYSERR;
178 : }
179 : /* build up big hash for signature checking later */
180 0 : TALER_exchange_online_wire_deposit_append (
181 : hash_context,
182 0 : &detail->h_contract_terms,
183 : td.execution_time,
184 0 : &detail->coin_pub,
185 0 : &detail->coin_value,
186 0 : &detail->coin_fee);
187 : }
188 : /* Check signature */
189 : {
190 : struct GNUNET_HashCode h_details;
191 :
192 0 : GNUNET_CRYPTO_hash_context_finish (hash_context,
193 : &h_details);
194 0 : if (GNUNET_OK !=
195 0 : TALER_exchange_online_wire_deposit_verify (
196 : &td.total_amount,
197 : &td.wire_fee,
198 : &merchant_pub,
199 : &td.h_payto,
200 : &h_details,
201 : &td.exchange_pub,
202 : &td.exchange_sig))
203 : {
204 0 : GNUNET_break_op (0);
205 0 : GNUNET_JSON_parse_free (spec);
206 0 : GNUNET_free (details);
207 0 : return GNUNET_SYSERR;
208 : }
209 : }
210 :
211 0 : if (0 >
212 0 : TALER_amount_subtract (&total_expected,
213 : &total_expected,
214 : &td.wire_fee))
215 : {
216 0 : GNUNET_break_op (0);
217 0 : GNUNET_JSON_parse_free (spec);
218 0 : GNUNET_free (details);
219 0 : return GNUNET_SYSERR;
220 : }
221 0 : if (0 !=
222 0 : TALER_amount_cmp (&total_expected,
223 : &td.total_amount))
224 : {
225 0 : GNUNET_break_op (0);
226 0 : GNUNET_JSON_parse_free (spec);
227 0 : GNUNET_free (details);
228 0 : return GNUNET_SYSERR;
229 : }
230 0 : wdh->cb (wdh->cb_cls,
231 : &hr,
232 : &td);
233 0 : GNUNET_free (details);
234 : }
235 0 : GNUNET_JSON_parse_free (spec);
236 0 : TALER_EXCHANGE_transfers_get_cancel (wdh);
237 0 : return GNUNET_OK;
238 : }
239 :
240 :
241 : /**
242 : * Function called when we're done processing the
243 : * HTTP /transfers/ request.
244 : *
245 : * @param cls the `struct TALER_EXCHANGE_TransfersGetHandle`
246 : * @param response_code HTTP response code, 0 on error
247 : * @param response parsed JSON result, NULL on error
248 : */
249 : static void
250 0 : handle_transfers_get_finished (void *cls,
251 : long response_code,
252 : const void *response)
253 : {
254 0 : struct TALER_EXCHANGE_TransfersGetHandle *wdh = cls;
255 0 : const json_t *j = response;
256 0 : struct TALER_EXCHANGE_HttpResponse hr = {
257 : .reply = j,
258 0 : .http_status = (unsigned int) response_code
259 : };
260 :
261 0 : wdh->job = NULL;
262 0 : switch (response_code)
263 : {
264 0 : case 0:
265 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
266 0 : break;
267 0 : case MHD_HTTP_OK:
268 0 : if (GNUNET_OK ==
269 0 : check_transfers_get_response_ok (wdh,
270 : j))
271 0 : return;
272 0 : GNUNET_break_op (0);
273 0 : hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
274 0 : hr.http_status = 0;
275 0 : break;
276 0 : case MHD_HTTP_BAD_REQUEST:
277 : /* This should never happen, either us or the exchange is buggy
278 : (or API version conflict); just pass JSON reply to the application */
279 0 : hr.ec = TALER_JSON_get_error_code (j);
280 0 : hr.hint = TALER_JSON_get_error_hint (j);
281 0 : break;
282 0 : case MHD_HTTP_FORBIDDEN:
283 : /* Nothing really to verify, exchange says one of the signatures is
284 : invalid; as we checked them, this should never happen, we
285 : should pass the JSON reply to the application */
286 0 : hr.ec = TALER_JSON_get_error_code (j);
287 0 : hr.hint = TALER_JSON_get_error_hint (j);
288 0 : break;
289 0 : case MHD_HTTP_NOT_FOUND:
290 : /* Exchange does not know about transaction;
291 : we should pass the reply to the application */
292 0 : hr.ec = TALER_JSON_get_error_code (j);
293 0 : hr.hint = TALER_JSON_get_error_hint (j);
294 0 : break;
295 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
296 : /* Server had an internal issue; we should retry, but this API
297 : leaves this to the application */
298 0 : hr.ec = TALER_JSON_get_error_code (j);
299 0 : hr.hint = TALER_JSON_get_error_hint (j);
300 0 : break;
301 0 : default:
302 : /* unexpected response code */
303 0 : GNUNET_break_op (0);
304 0 : hr.ec = TALER_JSON_get_error_code (j);
305 0 : hr.hint = TALER_JSON_get_error_hint (j);
306 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
307 : "Unexpected response code %u/%d for transfers get\n",
308 : (unsigned int) response_code,
309 : (int) hr.ec);
310 0 : break;
311 : }
312 0 : wdh->cb (wdh->cb_cls,
313 : &hr,
314 : NULL);
315 0 : TALER_EXCHANGE_transfers_get_cancel (wdh);
316 : }
317 :
318 :
319 : struct TALER_EXCHANGE_TransfersGetHandle *
320 0 : TALER_EXCHANGE_transfers_get (
321 : struct TALER_EXCHANGE_Handle *exchange,
322 : const struct TALER_WireTransferIdentifierRawP *wtid,
323 : TALER_EXCHANGE_TransfersGetCallback cb,
324 : void *cb_cls)
325 : {
326 : struct TALER_EXCHANGE_TransfersGetHandle *wdh;
327 : struct GNUNET_CURL_Context *ctx;
328 : CURL *eh;
329 : char arg_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2 + 32];
330 :
331 0 : if (GNUNET_YES !=
332 0 : TEAH_handle_is_ready (exchange))
333 : {
334 0 : GNUNET_break (0);
335 0 : return NULL;
336 : }
337 :
338 0 : wdh = GNUNET_new (struct TALER_EXCHANGE_TransfersGetHandle);
339 0 : wdh->exchange = exchange;
340 0 : wdh->cb = cb;
341 0 : wdh->cb_cls = cb_cls;
342 :
343 : {
344 : char wtid_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2];
345 : char *end;
346 :
347 0 : end = GNUNET_STRINGS_data_to_string (wtid,
348 : sizeof (struct
349 : TALER_WireTransferIdentifierRawP),
350 : wtid_str,
351 : sizeof (wtid_str));
352 0 : *end = '\0';
353 0 : GNUNET_snprintf (arg_str,
354 : sizeof (arg_str),
355 : "/transfers/%s",
356 : wtid_str);
357 : }
358 0 : wdh->url = TEAH_path_to_url (wdh->exchange,
359 : arg_str);
360 0 : if (NULL == wdh->url)
361 : {
362 0 : GNUNET_free (wdh);
363 0 : return NULL;
364 : }
365 0 : eh = TALER_EXCHANGE_curl_easy_get_ (wdh->url);
366 0 : if (NULL == eh)
367 : {
368 0 : GNUNET_break (0);
369 0 : GNUNET_free (wdh->url);
370 0 : GNUNET_free (wdh);
371 0 : return NULL;
372 : }
373 0 : ctx = TEAH_handle_to_context (exchange);
374 0 : wdh->job = GNUNET_CURL_job_add_with_ct_json (ctx,
375 : eh,
376 : &handle_transfers_get_finished,
377 : wdh);
378 0 : return wdh;
379 : }
380 :
381 :
382 : /**
383 : * Cancel wire deposits request. This function cannot be used on a request
384 : * handle if a response is already served for it.
385 : *
386 : * @param wdh the wire deposits request handle
387 : */
388 : void
389 0 : TALER_EXCHANGE_transfers_get_cancel (
390 : struct TALER_EXCHANGE_TransfersGetHandle *wdh)
391 : {
392 0 : if (NULL != wdh->job)
393 : {
394 0 : GNUNET_CURL_job_cancel (wdh->job);
395 0 : wdh->job = NULL;
396 : }
397 0 : GNUNET_free (wdh->url);
398 0 : GNUNET_free (wdh);
399 0 : }
400 :
401 :
402 : /* end of exchange_api_transfers_get.c */
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