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 Lesser General Public License as published by the Free Software
7 : Foundation; either version 2.1, 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 Lesser General Public License for more details.
12 :
13 : You should have received a copy of the GNU Lesser General Public License along with
14 : TALER; see the file COPYING.LGPL. If not, see
15 : <http://www.gnu.org/licenses/>
16 : */
17 : /**
18 : * @file merchant_api_tip_pickup2.c
19 : * @brief Implementation of the /tip-pickup request of the merchant's HTTP API
20 : * @author Marcello Stanisci
21 : * @author Christian Grothoff
22 : */
23 : #include "platform.h"
24 : #include <curl/curl.h>
25 : #include <jansson.h>
26 : #include <microhttpd.h> /* just for HTTP status codes */
27 : #include <gnunet/gnunet_util_lib.h>
28 : #include <gnunet/gnunet_curl_lib.h>
29 : #include "taler_merchant_service.h"
30 : #include "merchant_api_curl_defaults.h"
31 : #include <taler/taler_json_lib.h>
32 : #include <taler/taler_signatures.h>
33 : #include <taler/taler_curl_lib.h>
34 :
35 :
36 : /**
37 : * @brief A handle for tracking transactions.
38 : */
39 : struct TALER_MERCHANT_TipPickup2Handle
40 : {
41 :
42 : /**
43 : * The url for this request.
44 : */
45 : char *url;
46 :
47 : /**
48 : * Minor context that holds body and headers.
49 : */
50 : struct TALER_CURL_PostContext post_ctx;
51 :
52 : /**
53 : * Handle for the request.
54 : */
55 : struct GNUNET_CURL_Job *job;
56 :
57 : /**
58 : * Function to call with the result.
59 : */
60 : TALER_MERCHANT_TipPickup2Callback cb;
61 :
62 : /**
63 : * Closure for @a cb.
64 : */
65 : void *cb_cls;
66 :
67 : /**
68 : * Reference to the execution context.
69 : */
70 : struct GNUNET_CURL_Context *ctx;
71 :
72 : /**
73 : * Expected number of planchets.
74 : */
75 : unsigned int num_planchets;
76 : };
77 :
78 :
79 : /**
80 : * We got a 200 response back from the exchange (or the merchant).
81 : * Now we need to parse the response and if it is well-formed,
82 : * call the callback (and set it to NULL afterwards).
83 : *
84 : * @param tpo handle of the original authorization operation
85 : * @param json cryptographic proof returned by the exchange/merchant
86 : * @return #GNUNET_OK if response is valid
87 : */
88 : static int
89 0 : check_ok (struct TALER_MERCHANT_TipPickup2Handle *tpo,
90 : const json_t *json)
91 : {
92 : json_t *ja;
93 : unsigned int ja_len;
94 : struct GNUNET_JSON_Specification spec[] = {
95 0 : GNUNET_JSON_spec_json ("blind_sigs", &ja),
96 0 : GNUNET_JSON_spec_end ()
97 : };
98 0 : struct TALER_MERCHANT_HttpResponse hr = {
99 : .http_status = MHD_HTTP_OK,
100 : .reply = json
101 : };
102 :
103 0 : if (GNUNET_OK !=
104 0 : GNUNET_JSON_parse (json,
105 : spec,
106 : NULL, NULL))
107 : {
108 0 : GNUNET_break_op (0);
109 0 : return GNUNET_SYSERR;
110 : }
111 0 : ja_len = json_array_size (ja);
112 0 : if (ja_len != tpo->num_planchets)
113 : {
114 0 : GNUNET_break_op (0);
115 0 : GNUNET_JSON_parse_free (spec);
116 0 : return GNUNET_SYSERR;
117 : }
118 0 : {
119 0 : struct TALER_BlindedDenominationSignature mblind_sigs[ja_len];
120 :
121 0 : for (unsigned int i = 0; i<ja_len; i++)
122 : {
123 0 : json_t *pj = json_array_get (ja, i);
124 : struct GNUNET_JSON_Specification ispec[] = {
125 0 : TALER_JSON_spec_blinded_denom_sig ("blind_sig",
126 : &mblind_sigs[i]),
127 0 : GNUNET_JSON_spec_end ()
128 : };
129 :
130 0 : if (GNUNET_OK !=
131 0 : GNUNET_JSON_parse (pj,
132 : ispec,
133 : NULL, NULL))
134 : {
135 0 : GNUNET_break_op (0);
136 0 : GNUNET_JSON_parse_free (spec);
137 0 : return GNUNET_SYSERR;
138 : }
139 : }
140 0 : tpo->cb (tpo->cb_cls,
141 : &hr,
142 : ja_len,
143 : mblind_sigs);
144 0 : for (unsigned int i = 0; i<ja_len; i++)
145 0 : TALER_blinded_denom_sig_free (&mblind_sigs[i]);
146 0 : tpo->cb = NULL; /* do not call twice */
147 : }
148 0 : GNUNET_JSON_parse_free (spec);
149 0 : return GNUNET_OK;
150 : }
151 :
152 :
153 : /**
154 : * Function called when we're done processing the
155 : * HTTP /track/transaction request.
156 : *
157 : * @param cls the `struct TALER_MERCHANT_TipPickupHandle`
158 : * @param response_code HTTP response code, 0 on error
159 : * @param response response body, NULL if not in JSON
160 : */
161 : static void
162 0 : handle_tip_pickup_finished (void *cls,
163 : long response_code,
164 : const void *response)
165 : {
166 0 : struct TALER_MERCHANT_TipPickup2Handle *tpo = cls;
167 0 : const json_t *json = response;
168 0 : struct TALER_MERCHANT_HttpResponse hr = {
169 0 : .http_status = (unsigned int) response_code,
170 : .reply = json
171 : };
172 :
173 0 : tpo->job = NULL;
174 0 : switch (response_code)
175 : {
176 0 : case MHD_HTTP_OK:
177 0 : if (GNUNET_OK != check_ok (tpo,
178 : json))
179 : {
180 0 : GNUNET_break_op (0);
181 0 : hr.http_status = 0;
182 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
183 : }
184 0 : break;
185 0 : case MHD_HTTP_BAD_REQUEST:
186 : /* Can happen if we pickup an amount that exceeds the tip... */
187 0 : hr.ec = TALER_JSON_get_error_code (json);
188 0 : hr.hint = TALER_JSON_get_error_hint (json);
189 0 : GNUNET_break (TALER_EC_MERCHANT_TIP_PICKUP_AMOUNT_EXCEEDS_TIP_REMAINING ==
190 : hr.ec);
191 0 : break;
192 0 : case MHD_HTTP_CONFLICT:
193 : /* legal, can happen if we pickup a tip twice... */
194 0 : hr.ec = TALER_JSON_get_error_code (json);
195 0 : hr.hint = TALER_JSON_get_error_hint (json);
196 0 : break;
197 0 : case MHD_HTTP_NOT_FOUND:
198 : /* legal, can happen if tip ID is unknown */
199 0 : hr.ec = TALER_JSON_get_error_code (json);
200 0 : hr.hint = TALER_JSON_get_error_hint (json);
201 0 : break;
202 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
203 : /* Server had an internal issue; we should retry, but this API
204 : leaves this to the application */
205 0 : hr.ec = TALER_JSON_get_error_code (json);
206 0 : hr.hint = TALER_JSON_get_error_hint (json);
207 0 : break;
208 0 : default:
209 : /* unexpected response code */
210 0 : GNUNET_break_op (0);
211 0 : TALER_MERCHANT_parse_error_details_ (json,
212 : response_code,
213 : &hr);
214 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
215 : "Unexpected response code %u/%d\n",
216 : (unsigned int) response_code,
217 : (int) hr.ec);
218 0 : break;
219 : }
220 0 : if (NULL != tpo->cb)
221 : {
222 0 : tpo->cb (tpo->cb_cls,
223 : &hr,
224 : 0,
225 : NULL);
226 0 : tpo->cb = NULL;
227 : }
228 0 : TALER_MERCHANT_tip_pickup2_cancel (tpo);
229 0 : }
230 :
231 :
232 : struct TALER_MERCHANT_TipPickup2Handle *
233 0 : TALER_MERCHANT_tip_pickup2 (struct GNUNET_CURL_Context *ctx,
234 : const char *backend_url,
235 : const struct TALER_TipIdentifierP *tip_id,
236 : unsigned int num_planchets,
237 : const struct TALER_PlanchetDetail planchets[],
238 : TALER_MERCHANT_TipPickup2Callback pickup_cb,
239 : void *pickup_cb_cls)
240 : {
241 : struct TALER_MERCHANT_TipPickup2Handle *tpo;
242 : CURL *eh;
243 : json_t *pa;
244 : json_t *tp_obj;
245 :
246 0 : if (0 == num_planchets)
247 : {
248 0 : GNUNET_break (0);
249 0 : return NULL;
250 : }
251 0 : pa = json_array ();
252 0 : for (unsigned int i = 0; i<num_planchets; i++)
253 : {
254 0 : const struct TALER_PlanchetDetail *planchet = &planchets[i];
255 : json_t *p;
256 :
257 0 : p = GNUNET_JSON_PACK (
258 : GNUNET_JSON_pack_data_auto ("denom_pub_hash",
259 : &planchet->denom_pub_hash),
260 : TALER_JSON_pack_blinded_planchet ("coin_ev",
261 : &planchet->blinded_planchet));
262 0 : if (0 !=
263 0 : json_array_append_new (pa,
264 : p))
265 : {
266 0 : GNUNET_break (0);
267 0 : json_decref (pa);
268 0 : return NULL;
269 : }
270 : }
271 0 : tp_obj = GNUNET_JSON_PACK (
272 : GNUNET_JSON_pack_array_steal ("planchets",
273 : pa));
274 0 : tpo = GNUNET_new (struct TALER_MERCHANT_TipPickup2Handle);
275 0 : tpo->num_planchets = num_planchets;
276 0 : tpo->ctx = ctx;
277 0 : tpo->cb = pickup_cb;
278 0 : tpo->cb_cls = pickup_cb_cls;
279 :
280 : {
281 : char tip_str[sizeof (*tip_id) * 2];
282 : char arg_str[sizeof (tip_str) + 32];
283 : char *end;
284 :
285 0 : end = GNUNET_STRINGS_data_to_string (tip_id,
286 : sizeof (*tip_id),
287 : tip_str,
288 : sizeof (tip_str));
289 0 : *end = '\0';
290 0 : GNUNET_snprintf (arg_str,
291 : sizeof (arg_str),
292 : "tips/%s/pickup",
293 : tip_str);
294 0 : tpo->url = TALER_url_join (backend_url,
295 : arg_str,
296 : NULL);
297 : }
298 0 : if (NULL == tpo->url)
299 : {
300 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
301 : "Could not construct request URL.\n");
302 0 : json_decref (tp_obj);
303 0 : GNUNET_free (tpo);
304 0 : return NULL;
305 : }
306 0 : eh = TALER_MERCHANT_curl_easy_get_ (tpo->url);
307 0 : if (GNUNET_OK !=
308 0 : TALER_curl_easy_post (&tpo->post_ctx,
309 : eh,
310 : tp_obj))
311 : {
312 0 : GNUNET_break (0);
313 0 : json_decref (tp_obj);
314 0 : curl_easy_cleanup (eh);
315 0 : GNUNET_free (tpo->url);
316 0 : GNUNET_free (tpo);
317 0 : return NULL;
318 : }
319 0 : json_decref (tp_obj);
320 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
321 : "Requesting URL '%s'\n",
322 : tpo->url);
323 0 : tpo->job = GNUNET_CURL_job_add2 (ctx,
324 : eh,
325 0 : tpo->post_ctx.headers,
326 : &handle_tip_pickup_finished,
327 : tpo);
328 0 : if (NULL == tpo->job)
329 : {
330 0 : TALER_MERCHANT_tip_pickup2_cancel (tpo);
331 0 : return NULL;
332 : }
333 0 : return tpo;
334 : }
335 :
336 :
337 : void
338 0 : TALER_MERCHANT_tip_pickup2_cancel (
339 : struct TALER_MERCHANT_TipPickup2Handle *tpo)
340 : {
341 0 : if (NULL != tpo->job)
342 : {
343 0 : GNUNET_CURL_job_cancel (tpo->job);
344 0 : tpo->job = NULL;
345 : }
346 0 : TALER_curl_easy_post_finished (&tpo->post_ctx);
347 0 : GNUNET_free (tpo->url);
348 0 : GNUNET_free (tpo);
349 0 : }
350 :
351 :
352 : /* end of merchant_api_tip_pickup2.c */
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