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 5 : case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
152 5 : ks.hr.ec = TALER_JSON_get_error_code (j);
153 5 : ks.hr.hint = TALER_JSON_get_error_hint (j);
154 5 : if (GNUNET_OK !=
155 5 : TALER_EXCHANGE_parse_451 (&ks.details.unavailable_for_legal_reasons,
156 : j))
157 : {
158 0 : GNUNET_break_op (0);
159 0 : ks.hr.http_status = 0;
160 0 : ks.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
161 0 : break;
162 : }
163 5 : break;
164 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
165 0 : ks.hr.ec = TALER_JSON_get_error_code (j);
166 : /* Server had an internal issue; we should retry, but this API
167 : leaves this to the application */
168 0 : break;
169 0 : default:
170 : /* unexpected response code */
171 0 : GNUNET_break_op (0);
172 0 : ks.hr.ec = TALER_JSON_get_error_code (j);
173 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
174 : "Unexpected response code %u/%d for exchange /kyc-wallet\n",
175 : (unsigned int) response_code,
176 : (int) ks.hr.ec);
177 0 : break;
178 : }
179 7 : if (NULL != pkwh->cb)
180 : {
181 7 : pkwh->cb (pkwh->cb_cls,
182 : &ks);
183 7 : pkwh->cb = NULL;
184 : }
185 7 : TALER_EXCHANGE_post_kyc_wallet_cancel (pkwh);
186 7 : }
187 :
188 :
189 : struct TALER_EXCHANGE_PostKycWalletHandle *
190 7 : TALER_EXCHANGE_post_kyc_wallet_create (
191 : struct GNUNET_CURL_Context *ctx,
192 : const char *url,
193 : const struct TALER_ReservePrivateKeyP *reserve_priv,
194 : const struct TALER_Amount *balance)
195 : {
196 : struct TALER_EXCHANGE_PostKycWalletHandle *pkwh;
197 :
198 7 : pkwh = GNUNET_new (struct TALER_EXCHANGE_PostKycWalletHandle);
199 7 : pkwh->ctx = ctx;
200 7 : pkwh->base_url = GNUNET_strdup (url);
201 7 : pkwh->reserve_priv = *reserve_priv;
202 7 : pkwh->balance = *balance;
203 7 : return pkwh;
204 : }
205 :
206 :
207 : enum TALER_ErrorCode
208 7 : TALER_EXCHANGE_post_kyc_wallet_start (
209 : struct TALER_EXCHANGE_PostKycWalletHandle *pkwh,
210 : TALER_EXCHANGE_PostKycWalletCallback cb,
211 : TALER_EXCHANGE_POST_KYC_WALLET_RESULT_CLOSURE *cb_cls)
212 : {
213 : CURL *eh;
214 : json_t *req;
215 : struct TALER_ReservePublicKeyP reserve_pub;
216 : struct TALER_ReserveSignatureP reserve_sig;
217 :
218 7 : pkwh->cb = cb;
219 7 : pkwh->cb_cls = cb_cls;
220 7 : GNUNET_CRYPTO_eddsa_key_get_public (&pkwh->reserve_priv.eddsa_priv,
221 : &reserve_pub.eddsa_pub);
222 7 : TALER_wallet_account_setup_sign (&pkwh->reserve_priv,
223 7 : &pkwh->balance,
224 : &reserve_sig);
225 7 : req = GNUNET_JSON_PACK (
226 : TALER_JSON_pack_amount ("balance",
227 : &pkwh->balance),
228 : GNUNET_JSON_pack_data_auto ("reserve_pub",
229 : &reserve_pub),
230 : GNUNET_JSON_pack_data_auto ("reserve_sig",
231 : &reserve_sig));
232 7 : GNUNET_assert (NULL != req);
233 7 : pkwh->url = TALER_url_join (pkwh->base_url,
234 : "kyc-wallet",
235 : NULL);
236 7 : if (NULL == pkwh->url)
237 : {
238 0 : json_decref (req);
239 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
240 : }
241 7 : eh = TALER_EXCHANGE_curl_easy_get_ (pkwh->url);
242 14 : if ( (NULL == eh) ||
243 : (GNUNET_OK !=
244 7 : TALER_curl_easy_post (&pkwh->post_ctx,
245 : eh,
246 : req)) )
247 : {
248 0 : GNUNET_break (0);
249 0 : if (NULL != eh)
250 0 : curl_easy_cleanup (eh);
251 0 : json_decref (req);
252 0 : GNUNET_free (pkwh->url);
253 0 : pkwh->url = NULL;
254 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
255 : }
256 7 : json_decref (req);
257 7 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
258 : "Requesting URL '%s'\n",
259 : pkwh->url);
260 14 : pkwh->job = GNUNET_CURL_job_add2 (pkwh->ctx,
261 : eh,
262 7 : pkwh->post_ctx.headers,
263 : &handle_kyc_wallet_finished,
264 : pkwh);
265 7 : if (NULL == pkwh->job)
266 : {
267 0 : TALER_curl_easy_post_finished (&pkwh->post_ctx);
268 0 : GNUNET_free (pkwh->url);
269 0 : pkwh->url = NULL;
270 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
271 : }
272 7 : return TALER_EC_NONE;
273 : }
274 :
275 :
276 : void
277 7 : TALER_EXCHANGE_post_kyc_wallet_cancel (
278 : struct TALER_EXCHANGE_PostKycWalletHandle *pkwh)
279 : {
280 7 : if (NULL != pkwh->job)
281 : {
282 0 : GNUNET_CURL_job_cancel (pkwh->job);
283 0 : pkwh->job = NULL;
284 : }
285 7 : TALER_curl_easy_post_finished (&pkwh->post_ctx);
286 7 : GNUNET_free (pkwh->url);
287 7 : GNUNET_free (pkwh->base_url);
288 7 : GNUNET_free (pkwh);
289 7 : }
290 :
291 :
292 : /* end of exchange_api_post-kyc-wallet.c */
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