Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2022-2023 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_post-purses-PURSE_PUB-merge.c
19 : * @brief Implementation of the client to merge a purse
20 : * into an account
21 : * @author Christian Grothoff
22 : */
23 : #include "taler/platform.h"
24 : #include <jansson.h>
25 : #include <microhttpd.h> /* just for HTTP status codes */
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_json_lib.h>
28 : #include <gnunet/gnunet_curl_lib.h>
29 : #include "taler/taler_json_lib.h"
30 : #include "taler/taler_exchange_service.h"
31 : #include "exchange_api_handle.h"
32 : #include "exchange_api_common.h"
33 : #include "taler/taler_signatures.h"
34 : #include "exchange_api_curl_defaults.h"
35 :
36 :
37 : /**
38 : * @brief A purse merge with deposit handle
39 : */
40 : struct TALER_EXCHANGE_PostPursesMergeHandle
41 : {
42 :
43 : /**
44 : * The curl context for this request.
45 : */
46 : struct GNUNET_CURL_Context *ctx;
47 :
48 : /**
49 : * The base URL of the exchange.
50 : */
51 : char *base_url;
52 :
53 : /**
54 : * The keys of the exchange this request handle will use
55 : */
56 : struct TALER_EXCHANGE_Keys *keys;
57 :
58 : /**
59 : * The url for this request, set during _start.
60 : */
61 : char *url;
62 :
63 : /**
64 : * Context for #TEH_curl_easy_post(). Keeps the data that must
65 : * persist for Curl to make the upload.
66 : */
67 : struct TALER_CURL_PostContext post_ctx;
68 :
69 : /**
70 : * Handle for the request.
71 : */
72 : struct GNUNET_CURL_Job *job;
73 :
74 : /**
75 : * Function to call with the result.
76 : */
77 : TALER_EXCHANGE_PostPursesMergeCallback cb;
78 :
79 : /**
80 : * Closure for @a cb.
81 : */
82 : TALER_EXCHANGE_POST_PURSES_MERGE_RESULT_CLOSURE *cb_cls;
83 :
84 : /**
85 : * Base URL of the provider hosting the @e reserve_pub.
86 : */
87 : char *provider_url;
88 :
89 : /**
90 : * Signature for our operation.
91 : */
92 : struct TALER_PurseMergeSignatureP merge_sig;
93 :
94 : /**
95 : * Expected value in the purse after fees.
96 : */
97 : struct TALER_Amount purse_value_after_fees;
98 :
99 : /**
100 : * Public key of the reserve public key.
101 : */
102 : struct TALER_ReservePublicKeyP reserve_pub;
103 :
104 : /**
105 : * Public key of the purse.
106 : */
107 : struct TALER_PurseContractPublicKeyP purse_pub;
108 :
109 : /**
110 : * Hash over the purse's contract terms.
111 : */
112 : struct TALER_PrivateContractHashP h_contract_terms;
113 :
114 : /**
115 : * When does the purse expire.
116 : */
117 : struct GNUNET_TIME_Timestamp purse_expiration;
118 :
119 : /**
120 : * Our merge key.
121 : */
122 : struct TALER_PurseMergePrivateKeyP merge_priv;
123 :
124 : /**
125 : * Reserve signature affirming the merge.
126 : */
127 : struct TALER_ReserveSignatureP reserve_sig;
128 :
129 : /**
130 : * The JSON body to post, built during _create and posted during _start.
131 : */
132 : json_t *body;
133 :
134 : };
135 :
136 :
137 : /**
138 : * Function called when we're done processing the
139 : * HTTP /purse/$PID/merge request.
140 : *
141 : * @param cls the `struct TALER_EXCHANGE_PostPursesMergeHandle`
142 : * @param response_code HTTP response code, 0 on error
143 : * @param response parsed JSON result, NULL on error
144 : */
145 : static void
146 6 : handle_purse_merge_finished (void *cls,
147 : long response_code,
148 : const void *response)
149 : {
150 6 : struct TALER_EXCHANGE_PostPursesMergeHandle *pch = cls;
151 6 : const json_t *j = response;
152 6 : struct TALER_EXCHANGE_PostPursesMergeResponse dr = {
153 : .hr.reply = j,
154 6 : .hr.http_status = (unsigned int) response_code,
155 6 : .reserve_sig = &pch->reserve_sig
156 : };
157 :
158 6 : pch->job = NULL;
159 6 : switch (response_code)
160 : {
161 0 : case 0:
162 0 : dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
163 0 : break;
164 3 : case MHD_HTTP_OK:
165 : {
166 : struct GNUNET_JSON_Specification spec[] = {
167 3 : GNUNET_JSON_spec_fixed_auto ("exchange_sig",
168 : &dr.details.ok.exchange_sig),
169 3 : GNUNET_JSON_spec_fixed_auto ("exchange_pub",
170 : &dr.details.ok.exchange_pub),
171 3 : GNUNET_JSON_spec_timestamp ("exchange_timestamp",
172 : &dr.details.ok.etime),
173 3 : TALER_JSON_spec_amount ("merge_amount",
174 3 : pch->purse_value_after_fees.currency,
175 : &dr.details.ok.merge_amount),
176 3 : GNUNET_JSON_spec_end ()
177 : };
178 :
179 3 : if (GNUNET_OK !=
180 3 : GNUNET_JSON_parse (j,
181 : spec,
182 : NULL, NULL))
183 : {
184 0 : GNUNET_break_op (0);
185 0 : dr.hr.http_status = 0;
186 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
187 0 : break;
188 : }
189 3 : if (GNUNET_OK !=
190 3 : TALER_EXCHANGE_test_signing_key (pch->keys,
191 : &dr.details.ok.exchange_pub))
192 : {
193 0 : GNUNET_break_op (0);
194 0 : dr.hr.http_status = 0;
195 0 : dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID;
196 0 : break;
197 : }
198 3 : if (GNUNET_OK !=
199 3 : TALER_exchange_online_purse_merged_verify (
200 : dr.details.ok.etime,
201 : pch->purse_expiration,
202 3 : &pch->purse_value_after_fees,
203 3 : &pch->purse_pub,
204 3 : &pch->h_contract_terms,
205 3 : &pch->reserve_pub,
206 3 : pch->provider_url,
207 : &dr.details.ok.exchange_pub,
208 : &dr.details.ok.exchange_sig))
209 : {
210 0 : GNUNET_break_op (0);
211 0 : dr.hr.http_status = 0;
212 0 : dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID;
213 0 : break;
214 : }
215 : }
216 3 : break;
217 0 : case MHD_HTTP_BAD_REQUEST:
218 : /* This should never happen, either us or the exchange is buggy
219 : (or API version conflict); just pass JSON reply to the application */
220 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
221 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
222 0 : break;
223 0 : case MHD_HTTP_PAYMENT_REQUIRED:
224 : /* purse was not (yet) full */
225 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
226 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
227 0 : break;
228 0 : case MHD_HTTP_FORBIDDEN:
229 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
230 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
231 : /* Nothing really to verify, exchange says one of the signatures is
232 : invalid; as we checked them, this should never happen, we
233 : should pass the JSON reply to the application */
234 0 : break;
235 0 : case MHD_HTTP_NOT_FOUND:
236 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
237 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
238 : /* Nothing really to verify, this should never
239 : happen, we should pass the JSON reply to the application */
240 0 : break;
241 2 : case MHD_HTTP_CONFLICT:
242 : {
243 : struct TALER_PurseMergePublicKeyP merge_pub;
244 :
245 2 : GNUNET_CRYPTO_eddsa_key_get_public (&pch->merge_priv.eddsa_priv,
246 : &merge_pub.eddsa_pub);
247 2 : if (GNUNET_OK !=
248 2 : TALER_EXCHANGE_check_purse_merge_conflict_ (
249 2 : &pch->merge_sig,
250 : &merge_pub,
251 2 : &pch->purse_pub,
252 2 : pch->provider_url,
253 : j))
254 : {
255 0 : GNUNET_break_op (0);
256 0 : dr.hr.http_status = 0;
257 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
258 0 : break;
259 : }
260 2 : break;
261 : }
262 : break;
263 0 : case MHD_HTTP_GONE:
264 : /* could happen if denomination was revoked */
265 : /* Note: one might want to check /keys for revocation
266 : signature here, alas tricky in case our /keys
267 : is outdated => left to clients */
268 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
269 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
270 0 : break;
271 1 : case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
272 1 : dr.hr.ec = TALER_JSON_get_error_code (j);
273 1 : dr.hr.hint = TALER_JSON_get_error_hint (j);
274 1 : if (GNUNET_OK !=
275 1 : TALER_EXCHANGE_parse_451 (&dr.details.unavailable_for_legal_reasons,
276 : j))
277 : {
278 0 : GNUNET_break_op (0);
279 0 : dr.hr.http_status = 0;
280 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
281 0 : break;
282 : }
283 1 : break;
284 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
285 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
286 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
287 : /* Server had an internal issue; we should retry, but this API
288 : leaves this to the application */
289 0 : break;
290 0 : default:
291 : /* unexpected response code */
292 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
293 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
294 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
295 : "Unexpected response code %u/%d for exchange deposit\n",
296 : (unsigned int) response_code,
297 : dr.hr.ec);
298 0 : GNUNET_break_op (0);
299 0 : break;
300 : }
301 6 : if (NULL != pch->cb)
302 : {
303 6 : pch->cb (pch->cb_cls,
304 : &dr);
305 6 : pch->cb = NULL;
306 : }
307 6 : TALER_EXCHANGE_post_purses_merge_cancel (pch);
308 6 : }
309 :
310 :
311 : struct TALER_EXCHANGE_PostPursesMergeHandle *
312 6 : TALER_EXCHANGE_post_purses_merge_create (
313 : struct GNUNET_CURL_Context *ctx,
314 : const char *url,
315 : struct TALER_EXCHANGE_Keys *keys,
316 : const char *reserve_exchange_url,
317 : const struct TALER_ReservePrivateKeyP *reserve_priv,
318 : const struct TALER_PurseContractPublicKeyP *purse_pub,
319 : const struct TALER_PurseMergePrivateKeyP *merge_priv,
320 : const struct TALER_PrivateContractHashP *h_contract_terms,
321 : uint8_t min_age,
322 : const struct TALER_Amount *purse_value_after_fees,
323 : struct GNUNET_TIME_Timestamp purse_expiration,
324 : struct GNUNET_TIME_Timestamp merge_timestamp)
325 : {
326 : struct TALER_EXCHANGE_PostPursesMergeHandle *pch;
327 : struct TALER_NormalizedPayto reserve_url;
328 :
329 6 : pch = GNUNET_new (struct TALER_EXCHANGE_PostPursesMergeHandle);
330 6 : pch->ctx = ctx;
331 6 : pch->base_url = GNUNET_strdup (url);
332 6 : pch->merge_priv = *merge_priv;
333 6 : pch->purse_pub = *purse_pub;
334 6 : pch->h_contract_terms = *h_contract_terms;
335 6 : pch->purse_expiration = purse_expiration;
336 6 : pch->purse_value_after_fees = *purse_value_after_fees;
337 6 : if (NULL == reserve_exchange_url)
338 6 : pch->provider_url = GNUNET_strdup (url);
339 : else
340 0 : pch->provider_url = GNUNET_strdup (reserve_exchange_url);
341 6 : GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
342 : &pch->reserve_pub.eddsa_pub);
343 :
344 6 : reserve_url = TALER_reserve_make_payto (pch->provider_url,
345 6 : &pch->reserve_pub);
346 6 : if (NULL == reserve_url.normalized_payto)
347 : {
348 0 : GNUNET_break (0);
349 0 : GNUNET_free (pch->provider_url);
350 0 : GNUNET_free (pch->base_url);
351 0 : GNUNET_free (pch);
352 0 : return NULL;
353 : }
354 6 : TALER_wallet_purse_merge_sign (reserve_url,
355 : merge_timestamp,
356 : purse_pub,
357 : merge_priv,
358 : &pch->merge_sig);
359 : {
360 : struct TALER_Amount zero_purse_fee;
361 :
362 6 : GNUNET_assert (GNUNET_OK ==
363 : TALER_amount_set_zero (purse_value_after_fees->currency,
364 : &zero_purse_fee));
365 6 : TALER_wallet_account_merge_sign (merge_timestamp,
366 : purse_pub,
367 : purse_expiration,
368 : h_contract_terms,
369 : purse_value_after_fees,
370 : &zero_purse_fee,
371 : min_age,
372 : TALER_WAMF_MODE_MERGE_FULLY_PAID_PURSE,
373 : reserve_priv,
374 : &pch->reserve_sig);
375 : }
376 : // FIXME: move JSON construction into _start() function
377 6 : pch->body = GNUNET_JSON_PACK (
378 : TALER_JSON_pack_normalized_payto ("payto_uri",
379 : reserve_url),
380 : GNUNET_JSON_pack_data_auto ("merge_sig",
381 : &pch->merge_sig),
382 : GNUNET_JSON_pack_data_auto ("reserve_sig",
383 : &pch->reserve_sig),
384 : GNUNET_JSON_pack_timestamp ("merge_timestamp",
385 : merge_timestamp));
386 6 : GNUNET_free (reserve_url.normalized_payto);
387 6 : if (NULL == pch->body)
388 : {
389 0 : GNUNET_break (0);
390 0 : GNUNET_free (pch->provider_url);
391 0 : GNUNET_free (pch->base_url);
392 0 : GNUNET_free (pch);
393 0 : return NULL;
394 : }
395 6 : pch->keys = TALER_EXCHANGE_keys_incref (keys);
396 6 : return pch;
397 : }
398 :
399 :
400 : enum TALER_ErrorCode
401 6 : TALER_EXCHANGE_post_purses_merge_start (
402 : struct TALER_EXCHANGE_PostPursesMergeHandle *pch,
403 : TALER_EXCHANGE_PostPursesMergeCallback cb,
404 : TALER_EXCHANGE_POST_PURSES_MERGE_RESULT_CLOSURE *cb_cls)
405 : {
406 : char arg_str[sizeof (pch->purse_pub) * 2 + 32];
407 : CURL *eh;
408 :
409 6 : pch->cb = cb;
410 6 : pch->cb_cls = cb_cls;
411 :
412 : {
413 : char pub_str[sizeof (pch->purse_pub) * 2];
414 : char *end;
415 :
416 6 : end = GNUNET_STRINGS_data_to_string (
417 6 : &pch->purse_pub,
418 : sizeof (pch->purse_pub),
419 : pub_str,
420 : sizeof (pub_str));
421 6 : *end = '\0';
422 6 : GNUNET_snprintf (arg_str,
423 : sizeof (arg_str),
424 : "purses/%s/merge",
425 : pub_str);
426 : }
427 6 : pch->url = TALER_url_join (pch->base_url,
428 : arg_str,
429 : NULL);
430 6 : if (NULL == pch->url)
431 : {
432 0 : GNUNET_break (0);
433 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
434 : }
435 6 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
436 : "URL for purse merge: `%s'\n",
437 : pch->url);
438 6 : eh = TALER_EXCHANGE_curl_easy_get_ (pch->url);
439 12 : if ( (NULL == eh) ||
440 : (GNUNET_OK !=
441 6 : TALER_curl_easy_post (&pch->post_ctx,
442 : eh,
443 6 : pch->body)) )
444 : {
445 0 : GNUNET_break (0);
446 0 : if (NULL != eh)
447 0 : curl_easy_cleanup (eh);
448 0 : return TALER_EC_GENERIC_CURL_ALLOCATION_FAILURE;
449 : }
450 12 : pch->job = GNUNET_CURL_job_add2 (pch->ctx,
451 : eh,
452 6 : pch->post_ctx.headers,
453 : &handle_purse_merge_finished,
454 : pch);
455 6 : if (NULL == pch->job)
456 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
457 6 : return TALER_EC_NONE;
458 : }
459 :
460 :
461 : void
462 6 : TALER_EXCHANGE_post_purses_merge_cancel (
463 : struct TALER_EXCHANGE_PostPursesMergeHandle *pch)
464 : {
465 6 : if (NULL != pch->job)
466 : {
467 0 : GNUNET_CURL_job_cancel (pch->job);
468 0 : pch->job = NULL;
469 : }
470 6 : GNUNET_free (pch->url);
471 6 : GNUNET_free (pch->base_url);
472 6 : GNUNET_free (pch->provider_url);
473 6 : TALER_curl_easy_post_finished (&pch->post_ctx);
474 6 : TALER_EXCHANGE_keys_decref (pch->keys);
475 6 : json_decref (pch->body);
476 6 : GNUNET_free (pch);
477 6 : }
478 :
479 :
480 : /* end of exchange_api_post-purses-PURSE_PUB-merge.c */
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