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 TALER_Amount total_deposited;
167 : struct GNUNET_JSON_Specification spec[] = {
168 3 : GNUNET_JSON_spec_fixed_auto ("exchange_sig",
169 : &dr.details.ok.exchange_sig),
170 3 : GNUNET_JSON_spec_fixed_auto ("exchange_pub",
171 : &dr.details.ok.exchange_pub),
172 3 : GNUNET_JSON_spec_timestamp ("exchange_timestamp",
173 : &dr.details.ok.etime),
174 3 : TALER_JSON_spec_amount ("merge_amount",
175 3 : pch->purse_value_after_fees.currency,
176 : &total_deposited),
177 3 : GNUNET_JSON_spec_end ()
178 : };
179 :
180 3 : if (GNUNET_OK !=
181 3 : GNUNET_JSON_parse (j,
182 : spec,
183 : NULL, NULL))
184 : {
185 0 : GNUNET_break_op (0);
186 0 : dr.hr.http_status = 0;
187 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
188 0 : break;
189 : }
190 3 : if (GNUNET_OK !=
191 3 : TALER_EXCHANGE_test_signing_key (pch->keys,
192 : &dr.details.ok.exchange_pub))
193 : {
194 0 : GNUNET_break_op (0);
195 0 : dr.hr.http_status = 0;
196 0 : dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID;
197 0 : break;
198 : }
199 3 : if (GNUNET_OK !=
200 3 : TALER_exchange_online_purse_merged_verify (
201 : dr.details.ok.etime,
202 : pch->purse_expiration,
203 3 : &pch->purse_value_after_fees,
204 3 : &pch->purse_pub,
205 3 : &pch->h_contract_terms,
206 3 : &pch->reserve_pub,
207 3 : pch->provider_url,
208 : &dr.details.ok.exchange_pub,
209 : &dr.details.ok.exchange_sig))
210 : {
211 0 : GNUNET_break_op (0);
212 0 : dr.hr.http_status = 0;
213 0 : dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID;
214 0 : break;
215 : }
216 : }
217 3 : break;
218 0 : case MHD_HTTP_BAD_REQUEST:
219 : /* This should never happen, either us or the exchange is buggy
220 : (or API version conflict); just pass JSON reply to the application */
221 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
222 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
223 0 : break;
224 0 : case MHD_HTTP_PAYMENT_REQUIRED:
225 : /* purse was not (yet) full */
226 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
227 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
228 0 : break;
229 0 : case MHD_HTTP_FORBIDDEN:
230 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
231 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
232 : /* Nothing really to verify, exchange says one of the signatures is
233 : invalid; as we checked them, this should never happen, we
234 : should pass the JSON reply to the application */
235 0 : break;
236 0 : case MHD_HTTP_NOT_FOUND:
237 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
238 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
239 : /* Nothing really to verify, this should never
240 : happen, we should pass the JSON reply to the application */
241 0 : break;
242 2 : case MHD_HTTP_CONFLICT:
243 : {
244 : struct TALER_PurseMergePublicKeyP merge_pub;
245 :
246 2 : GNUNET_CRYPTO_eddsa_key_get_public (&pch->merge_priv.eddsa_priv,
247 : &merge_pub.eddsa_pub);
248 2 : if (GNUNET_OK !=
249 2 : TALER_EXCHANGE_check_purse_merge_conflict_ (
250 2 : &pch->merge_sig,
251 : &merge_pub,
252 2 : &pch->purse_pub,
253 2 : pch->provider_url,
254 : j))
255 : {
256 0 : GNUNET_break_op (0);
257 0 : dr.hr.http_status = 0;
258 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
259 0 : break;
260 : }
261 2 : break;
262 : }
263 : break;
264 0 : case MHD_HTTP_GONE:
265 : /* could happen if denomination was revoked */
266 : /* Note: one might want to check /keys for revocation
267 : signature here, alas tricky in case our /keys
268 : is outdated => left to clients */
269 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
270 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
271 0 : break;
272 1 : case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
273 : {
274 : struct GNUNET_JSON_Specification spec[] = {
275 1 : GNUNET_JSON_spec_uint64 (
276 : "requirement_row",
277 : &dr.details.unavailable_for_legal_reasons.requirement_row),
278 1 : GNUNET_JSON_spec_end ()
279 : };
280 :
281 1 : if (GNUNET_OK !=
282 1 : GNUNET_JSON_parse (j,
283 : spec,
284 : NULL, NULL))
285 : {
286 0 : GNUNET_break_op (0);
287 0 : dr.hr.http_status = 0;
288 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
289 0 : break;
290 : }
291 : }
292 1 : break;
293 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
294 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
295 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
296 : /* Server had an internal issue; we should retry, but this API
297 : leaves this to the application */
298 0 : break;
299 0 : default:
300 : /* unexpected response code */
301 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
302 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
303 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
304 : "Unexpected response code %u/%d for exchange deposit\n",
305 : (unsigned int) response_code,
306 : dr.hr.ec);
307 0 : GNUNET_break_op (0);
308 0 : break;
309 : }
310 6 : if (NULL != pch->cb)
311 : {
312 6 : pch->cb (pch->cb_cls,
313 : &dr);
314 6 : pch->cb = NULL;
315 : }
316 6 : TALER_EXCHANGE_post_purses_merge_cancel (pch);
317 6 : }
318 :
319 :
320 : struct TALER_EXCHANGE_PostPursesMergeHandle *
321 6 : TALER_EXCHANGE_post_purses_merge_create (
322 : struct GNUNET_CURL_Context *ctx,
323 : const char *url,
324 : struct TALER_EXCHANGE_Keys *keys,
325 : const char *reserve_exchange_url,
326 : const struct TALER_ReservePrivateKeyP *reserve_priv,
327 : const struct TALER_PurseContractPublicKeyP *purse_pub,
328 : const struct TALER_PurseMergePrivateKeyP *merge_priv,
329 : const struct TALER_PrivateContractHashP *h_contract_terms,
330 : uint8_t min_age,
331 : const struct TALER_Amount *purse_value_after_fees,
332 : struct GNUNET_TIME_Timestamp purse_expiration,
333 : struct GNUNET_TIME_Timestamp merge_timestamp)
334 : {
335 : struct TALER_EXCHANGE_PostPursesMergeHandle *pch;
336 : struct TALER_NormalizedPayto reserve_url;
337 :
338 6 : pch = GNUNET_new (struct TALER_EXCHANGE_PostPursesMergeHandle);
339 6 : pch->ctx = ctx;
340 6 : pch->base_url = GNUNET_strdup (url);
341 6 : pch->merge_priv = *merge_priv;
342 6 : pch->purse_pub = *purse_pub;
343 6 : pch->h_contract_terms = *h_contract_terms;
344 6 : pch->purse_expiration = purse_expiration;
345 6 : pch->purse_value_after_fees = *purse_value_after_fees;
346 6 : if (NULL == reserve_exchange_url)
347 6 : pch->provider_url = GNUNET_strdup (url);
348 : else
349 0 : pch->provider_url = GNUNET_strdup (reserve_exchange_url);
350 6 : GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
351 : &pch->reserve_pub.eddsa_pub);
352 :
353 6 : reserve_url = TALER_reserve_make_payto (pch->provider_url,
354 6 : &pch->reserve_pub);
355 6 : if (NULL == reserve_url.normalized_payto)
356 : {
357 0 : GNUNET_break (0);
358 0 : GNUNET_free (pch->provider_url);
359 0 : GNUNET_free (pch->base_url);
360 0 : GNUNET_free (pch);
361 0 : return NULL;
362 : }
363 6 : TALER_wallet_purse_merge_sign (reserve_url,
364 : merge_timestamp,
365 : purse_pub,
366 : merge_priv,
367 : &pch->merge_sig);
368 : {
369 : struct TALER_Amount zero_purse_fee;
370 :
371 6 : GNUNET_assert (GNUNET_OK ==
372 : TALER_amount_set_zero (purse_value_after_fees->currency,
373 : &zero_purse_fee));
374 6 : TALER_wallet_account_merge_sign (merge_timestamp,
375 : purse_pub,
376 : purse_expiration,
377 : h_contract_terms,
378 : purse_value_after_fees,
379 : &zero_purse_fee,
380 : min_age,
381 : TALER_WAMF_MODE_MERGE_FULLY_PAID_PURSE,
382 : reserve_priv,
383 : &pch->reserve_sig);
384 : }
385 : // FIXME: move JSON construction into _start() function
386 6 : pch->body = GNUNET_JSON_PACK (
387 : TALER_JSON_pack_normalized_payto ("payto_uri",
388 : reserve_url),
389 : GNUNET_JSON_pack_data_auto ("merge_sig",
390 : &pch->merge_sig),
391 : GNUNET_JSON_pack_data_auto ("reserve_sig",
392 : &pch->reserve_sig),
393 : GNUNET_JSON_pack_timestamp ("merge_timestamp",
394 : merge_timestamp));
395 6 : GNUNET_free (reserve_url.normalized_payto);
396 6 : if (NULL == pch->body)
397 : {
398 0 : GNUNET_break (0);
399 0 : GNUNET_free (pch->provider_url);
400 0 : GNUNET_free (pch->base_url);
401 0 : GNUNET_free (pch);
402 0 : return NULL;
403 : }
404 6 : pch->keys = TALER_EXCHANGE_keys_incref (keys);
405 6 : return pch;
406 : }
407 :
408 :
409 : enum TALER_ErrorCode
410 6 : TALER_EXCHANGE_post_purses_merge_start (
411 : struct TALER_EXCHANGE_PostPursesMergeHandle *pch,
412 : TALER_EXCHANGE_PostPursesMergeCallback cb,
413 : TALER_EXCHANGE_POST_PURSES_MERGE_RESULT_CLOSURE *cb_cls)
414 : {
415 : char arg_str[sizeof (pch->purse_pub) * 2 + 32];
416 : CURL *eh;
417 :
418 6 : pch->cb = cb;
419 6 : pch->cb_cls = cb_cls;
420 :
421 : {
422 : char pub_str[sizeof (pch->purse_pub) * 2];
423 : char *end;
424 :
425 6 : end = GNUNET_STRINGS_data_to_string (
426 6 : &pch->purse_pub,
427 : sizeof (pch->purse_pub),
428 : pub_str,
429 : sizeof (pub_str));
430 6 : *end = '\0';
431 6 : GNUNET_snprintf (arg_str,
432 : sizeof (arg_str),
433 : "purses/%s/merge",
434 : pub_str);
435 : }
436 6 : pch->url = TALER_url_join (pch->base_url,
437 : arg_str,
438 : NULL);
439 6 : if (NULL == pch->url)
440 : {
441 0 : GNUNET_break (0);
442 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
443 : }
444 6 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
445 : "URL for purse merge: `%s'\n",
446 : pch->url);
447 6 : eh = TALER_EXCHANGE_curl_easy_get_ (pch->url);
448 12 : if ( (NULL == eh) ||
449 : (GNUNET_OK !=
450 6 : TALER_curl_easy_post (&pch->post_ctx,
451 : eh,
452 6 : pch->body)) )
453 : {
454 0 : GNUNET_break (0);
455 0 : if (NULL != eh)
456 0 : curl_easy_cleanup (eh);
457 0 : return TALER_EC_GENERIC_CURL_ALLOCATION_FAILURE;
458 : }
459 12 : pch->job = GNUNET_CURL_job_add2 (pch->ctx,
460 : eh,
461 6 : pch->post_ctx.headers,
462 : &handle_purse_merge_finished,
463 : pch);
464 6 : if (NULL == pch->job)
465 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
466 6 : return TALER_EC_NONE;
467 : }
468 :
469 :
470 : void
471 6 : TALER_EXCHANGE_post_purses_merge_cancel (
472 : struct TALER_EXCHANGE_PostPursesMergeHandle *pch)
473 : {
474 6 : if (NULL != pch->job)
475 : {
476 0 : GNUNET_CURL_job_cancel (pch->job);
477 0 : pch->job = NULL;
478 : }
479 6 : GNUNET_free (pch->url);
480 6 : GNUNET_free (pch->base_url);
481 6 : GNUNET_free (pch->provider_url);
482 6 : TALER_curl_easy_post_finished (&pch->post_ctx);
483 6 : TALER_EXCHANGE_keys_decref (pch->keys);
484 6 : json_decref (pch->body);
485 6 : GNUNET_free (pch);
486 6 : }
487 :
488 :
489 : /* end of exchange_api_post-purses-PURSE_PUB-merge.c */
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