Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2021-2026 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-kyc-wallet.c
19 : * @brief Implementation of the /kyc-wallet request
20 : * @author Christian Grothoff
21 : */
22 : #include "taler/platform.h"
23 : #include <microhttpd.h> /* just for HTTP status codes */
24 : #include <gnunet/gnunet_util_lib.h>
25 : #include <gnunet/gnunet_curl_lib.h>
26 : #include "taler/taler_exchange_service.h"
27 : #include "taler/taler_json_lib.h"
28 : #include "taler/taler-exchange/post-kyc-wallet.h"
29 : #include "taler/taler_signatures.h"
30 : #include "exchange_api_curl_defaults.h"
31 : #include "taler/taler_curl_lib.h"
32 :
33 :
34 : /**
35 : * @brief A POST /kyc-wallet handle
36 : */
37 : struct TALER_EXCHANGE_PostKycWalletHandle
38 : {
39 :
40 : /**
41 : * Context for curl easy post. Keeps the data that must
42 : * persist for Curl to make the upload.
43 : */
44 : struct TALER_CURL_PostContext post_ctx;
45 :
46 : /**
47 : * The base URL for this request.
48 : */
49 : char *base_url;
50 :
51 : /**
52 : * The full URL for this request, set during _start.
53 : */
54 : char *url;
55 :
56 : /**
57 : * Handle for the request.
58 : */
59 : struct GNUNET_CURL_Job *job;
60 :
61 : /**
62 : * Function to call with the result.
63 : */
64 : TALER_EXCHANGE_PostKycWalletCallback cb;
65 :
66 : /**
67 : * Closure for @e cb.
68 : */
69 : TALER_EXCHANGE_POST_KYC_WALLET_RESULT_CLOSURE *cb_cls;
70 :
71 : /**
72 : * Reference to the execution context.
73 : */
74 : struct GNUNET_CURL_Context *ctx;
75 :
76 : /**
77 : * Reserve private key of the wallet.
78 : */
79 : struct TALER_ReservePrivateKeyP reserve_priv;
80 :
81 : /**
82 : * Balance (or balance threshold) crossed by the wallet.
83 : */
84 : struct TALER_Amount balance;
85 :
86 : };
87 :
88 :
89 : /**
90 : * Function called when we're done processing the
91 : * HTTP /kyc-wallet request.
92 : *
93 : * @param cls the `struct TALER_EXCHANGE_PostKycWalletHandle`
94 : * @param response_code HTTP response code, 0 on error
95 : * @param response parsed JSON result, NULL on error
96 : */
97 : static void
98 7 : handle_kyc_wallet_finished (void *cls,
99 : long response_code,
100 : const void *response)
101 : {
102 7 : struct TALER_EXCHANGE_PostKycWalletHandle *pkwh = cls;
103 7 : const json_t *j = response;
104 7 : struct TALER_EXCHANGE_PostKycWalletResponse ks = {
105 : .hr.reply = j,
106 7 : .hr.http_status = (unsigned int) response_code
107 : };
108 :
109 7 : pkwh->job = NULL;
110 7 : switch (response_code)
111 : {
112 0 : case 0:
113 0 : ks.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
114 0 : break;
115 2 : case MHD_HTTP_OK:
116 : {
117 : struct GNUNET_JSON_Specification spec[] = {
118 2 : GNUNET_JSON_spec_mark_optional (
119 : TALER_JSON_spec_amount_any (
120 : "next_threshold",
121 : &ks.details.ok.next_threshold),
122 : NULL),
123 2 : GNUNET_JSON_spec_timestamp (
124 : "expiration_time",
125 : &ks.details.ok.expiration_time),
126 2 : GNUNET_JSON_spec_end ()
127 : };
128 :
129 2 : if (GNUNET_OK !=
130 2 : GNUNET_JSON_parse (j,
131 : spec,
132 : NULL, NULL))
133 : {
134 0 : GNUNET_break_op (0);
135 0 : ks.hr.http_status = 0;
136 0 : ks.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
137 0 : break;
138 : }
139 2 : break;
140 : }
141 0 : case MHD_HTTP_NO_CONTENT:
142 0 : break;
143 0 : case MHD_HTTP_BAD_REQUEST:
144 0 : ks.hr.ec = TALER_JSON_get_error_code (j);
145 : /* This should never happen, either us or the exchange is buggy
146 : (or API version conflict); just pass JSON reply to the application */
147 0 : break;
148 0 : case MHD_HTTP_FORBIDDEN:
149 0 : ks.hr.ec = TALER_JSON_get_error_code (j);
150 0 : break;
151 0 : case MHD_HTTP_NOT_FOUND:
152 0 : ks.hr.ec = TALER_JSON_get_error_code (j);
153 0 : break;
154 5 : case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
155 : {
156 : struct GNUNET_JSON_Specification spec[] = {
157 5 : GNUNET_JSON_spec_fixed_auto (
158 : "h_payto",
159 : &ks.details.unavailable_for_legal_reasons.h_payto),
160 5 : GNUNET_JSON_spec_uint64 (
161 : "requirement_row",
162 : &ks.details.unavailable_for_legal_reasons.requirement_row),
163 5 : GNUNET_JSON_spec_end ()
164 : };
165 :
166 5 : if (GNUNET_OK !=
167 5 : GNUNET_JSON_parse (j,
168 : spec,
169 : NULL, NULL))
170 : {
171 0 : GNUNET_break_op (0);
172 0 : ks.hr.http_status = 0;
173 0 : ks.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
174 0 : break;
175 : }
176 5 : break;
177 : }
178 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
179 0 : ks.hr.ec = TALER_JSON_get_error_code (j);
180 : /* Server had an internal issue; we should retry, but this API
181 : leaves this to the application */
182 0 : break;
183 0 : default:
184 : /* unexpected response code */
185 0 : GNUNET_break_op (0);
186 0 : ks.hr.ec = TALER_JSON_get_error_code (j);
187 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
188 : "Unexpected response code %u/%d for exchange /kyc-wallet\n",
189 : (unsigned int) response_code,
190 : (int) ks.hr.ec);
191 0 : break;
192 : }
193 7 : if (NULL != pkwh->cb)
194 : {
195 7 : pkwh->cb (pkwh->cb_cls,
196 : &ks);
197 7 : pkwh->cb = NULL;
198 : }
199 7 : TALER_EXCHANGE_post_kyc_wallet_cancel (pkwh);
200 7 : }
201 :
202 :
203 : struct TALER_EXCHANGE_PostKycWalletHandle *
204 7 : TALER_EXCHANGE_post_kyc_wallet_create (
205 : struct GNUNET_CURL_Context *ctx,
206 : const char *url,
207 : const struct TALER_ReservePrivateKeyP *reserve_priv,
208 : const struct TALER_Amount *balance)
209 : {
210 : struct TALER_EXCHANGE_PostKycWalletHandle *pkwh;
211 :
212 7 : pkwh = GNUNET_new (struct TALER_EXCHANGE_PostKycWalletHandle);
213 7 : pkwh->ctx = ctx;
214 7 : pkwh->base_url = GNUNET_strdup (url);
215 7 : pkwh->reserve_priv = *reserve_priv;
216 7 : pkwh->balance = *balance;
217 7 : return pkwh;
218 : }
219 :
220 :
221 : enum TALER_ErrorCode
222 7 : TALER_EXCHANGE_post_kyc_wallet_start (
223 : struct TALER_EXCHANGE_PostKycWalletHandle *pkwh,
224 : TALER_EXCHANGE_PostKycWalletCallback cb,
225 : TALER_EXCHANGE_POST_KYC_WALLET_RESULT_CLOSURE *cb_cls)
226 : {
227 : CURL *eh;
228 : json_t *req;
229 : struct TALER_ReservePublicKeyP reserve_pub;
230 : struct TALER_ReserveSignatureP reserve_sig;
231 :
232 7 : pkwh->cb = cb;
233 7 : pkwh->cb_cls = cb_cls;
234 7 : GNUNET_CRYPTO_eddsa_key_get_public (&pkwh->reserve_priv.eddsa_priv,
235 : &reserve_pub.eddsa_pub);
236 7 : TALER_wallet_account_setup_sign (&pkwh->reserve_priv,
237 7 : &pkwh->balance,
238 : &reserve_sig);
239 7 : req = GNUNET_JSON_PACK (
240 : TALER_JSON_pack_amount ("balance",
241 : &pkwh->balance),
242 : GNUNET_JSON_pack_data_auto ("reserve_pub",
243 : &reserve_pub),
244 : GNUNET_JSON_pack_data_auto ("reserve_sig",
245 : &reserve_sig));
246 7 : GNUNET_assert (NULL != req);
247 7 : pkwh->url = TALER_url_join (pkwh->base_url,
248 : "kyc-wallet",
249 : NULL);
250 7 : if (NULL == pkwh->url)
251 : {
252 0 : json_decref (req);
253 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
254 : }
255 7 : eh = TALER_EXCHANGE_curl_easy_get_ (pkwh->url);
256 14 : if ( (NULL == eh) ||
257 : (GNUNET_OK !=
258 7 : TALER_curl_easy_post (&pkwh->post_ctx,
259 : eh,
260 : req)) )
261 : {
262 0 : GNUNET_break (0);
263 0 : if (NULL != eh)
264 0 : curl_easy_cleanup (eh);
265 0 : json_decref (req);
266 0 : GNUNET_free (pkwh->url);
267 0 : pkwh->url = NULL;
268 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
269 : }
270 7 : json_decref (req);
271 7 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
272 : "Requesting URL '%s'\n",
273 : pkwh->url);
274 14 : pkwh->job = GNUNET_CURL_job_add2 (pkwh->ctx,
275 : eh,
276 7 : pkwh->post_ctx.headers,
277 : &handle_kyc_wallet_finished,
278 : pkwh);
279 7 : if (NULL == pkwh->job)
280 : {
281 0 : TALER_curl_easy_post_finished (&pkwh->post_ctx);
282 0 : GNUNET_free (pkwh->url);
283 0 : pkwh->url = NULL;
284 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
285 : }
286 7 : return TALER_EC_NONE;
287 : }
288 :
289 :
290 : void
291 7 : TALER_EXCHANGE_post_kyc_wallet_cancel (
292 : struct TALER_EXCHANGE_PostKycWalletHandle *pkwh)
293 : {
294 7 : if (NULL != pkwh->job)
295 : {
296 0 : GNUNET_CURL_job_cancel (pkwh->job);
297 0 : pkwh->job = NULL;
298 : }
299 7 : TALER_curl_easy_post_finished (&pkwh->post_ctx);
300 7 : GNUNET_free (pkwh->url);
301 7 : GNUNET_free (pkwh->base_url);
302 7 : GNUNET_free (pkwh);
303 7 : }
304 :
305 :
306 : /* end of exchange_api_post-kyc-wallet.c */
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