Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2014-2026 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_get-reserves-RESERVE_PUB-attest.c
19 : * @brief Implementation of the GET /reserves/$RESERVE_PUB/attest request
20 : * @author Christian Grothoff
21 : */
22 : #include <jansson.h>
23 : #include <microhttpd.h> /* just for HTTP status codes */
24 : #include <gnunet/gnunet_util_lib.h>
25 : #include <gnunet/gnunet_json_lib.h>
26 : #include <gnunet/gnunet_curl_lib.h>
27 : #include "taler/taler_json_lib.h"
28 : #include "exchange_api_handle.h"
29 : #include "taler/taler_signatures.h"
30 : #include "exchange_api_curl_defaults.h"
31 :
32 :
33 : /**
34 : * @brief A GET /reserves/$RESERVE_PUB/attest Handle
35 : */
36 : struct TALER_EXCHANGE_GetReservesAttestHandle
37 : {
38 :
39 : /**
40 : * Base URL of the exchange.
41 : */
42 : char *base_url;
43 :
44 : /**
45 : * The url for this request.
46 : */
47 : char *url;
48 :
49 : /**
50 : * CURL context to use.
51 : */
52 : struct GNUNET_CURL_Context *ctx;
53 :
54 : /**
55 : * Handle for the request.
56 : */
57 : struct GNUNET_CURL_Job *job;
58 :
59 : /**
60 : * Function to call with the result.
61 : */
62 : TALER_EXCHANGE_GetReservesAttestCallback cb;
63 :
64 : /**
65 : * Closure for @e cb.
66 : */
67 : TALER_EXCHANGE_GET_RESERVES_ATTEST_RESULT_CLOSURE *cb_cls;
68 :
69 : /**
70 : * Public key of the reserve we are querying.
71 : */
72 : struct TALER_ReservePublicKeyP reserve_pub;
73 :
74 : };
75 :
76 :
77 : /**
78 : * We received an #MHD_HTTP_OK status code. Handle the JSON response.
79 : *
80 : * @param grah handle of the request
81 : * @param j JSON response
82 : * @return #GNUNET_OK on success
83 : */
84 : static enum GNUNET_GenericReturnValue
85 1 : handle_reserves_get_attestable_ok (
86 : struct TALER_EXCHANGE_GetReservesAttestHandle *grah,
87 : const json_t *j)
88 : {
89 1 : struct TALER_EXCHANGE_GetReservesAttestResponse rs = {
90 : .hr.reply = j,
91 : .hr.http_status = MHD_HTTP_OK
92 : };
93 : const json_t *details;
94 : struct GNUNET_JSON_Specification spec[] = {
95 1 : GNUNET_JSON_spec_array_const ("details",
96 : &details),
97 1 : GNUNET_JSON_spec_end ()
98 : };
99 :
100 1 : if (GNUNET_OK !=
101 1 : GNUNET_JSON_parse (j,
102 : spec,
103 : NULL,
104 : NULL))
105 : {
106 0 : GNUNET_break_op (0);
107 0 : return GNUNET_SYSERR;
108 : }
109 1 : {
110 1 : size_t dlen = json_array_size (details);
111 1 : const char *attributes[GNUNET_NZL (dlen)];
112 :
113 5 : for (unsigned int i = 0; i < dlen; i++)
114 : {
115 4 : json_t *detail = json_array_get (details,
116 : i);
117 4 : attributes[i] = json_string_value (detail);
118 4 : if (NULL == attributes[i])
119 : {
120 0 : GNUNET_break_op (0);
121 0 : return GNUNET_SYSERR;
122 : }
123 : }
124 1 : rs.details.ok.attributes_length = dlen;
125 1 : rs.details.ok.attributes = attributes;
126 1 : grah->cb (grah->cb_cls,
127 : &rs);
128 1 : grah->cb = NULL;
129 : }
130 1 : return GNUNET_OK;
131 : }
132 :
133 :
134 : /**
135 : * Function called when we're done processing the
136 : * HTTP GET /reserves/$RESERVE_PUB/attest request.
137 : *
138 : * @param cls the `struct TALER_EXCHANGE_GetReservesAttestHandle`
139 : * @param response_code HTTP response code, 0 on error
140 : * @param response parsed JSON result, NULL on error
141 : */
142 : static void
143 6 : handle_reserves_get_attestable_finished (void *cls,
144 : long response_code,
145 : const void *response)
146 : {
147 6 : struct TALER_EXCHANGE_GetReservesAttestHandle *grah = cls;
148 6 : const json_t *j = response;
149 6 : struct TALER_EXCHANGE_GetReservesAttestResponse rs = {
150 : .hr.reply = j,
151 6 : .hr.http_status = (unsigned int) response_code
152 : };
153 :
154 6 : grah->job = NULL;
155 6 : switch (response_code)
156 : {
157 0 : case 0:
158 0 : rs.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
159 0 : break;
160 1 : case MHD_HTTP_OK:
161 1 : if (GNUNET_OK !=
162 1 : handle_reserves_get_attestable_ok (grah,
163 : j))
164 : {
165 0 : rs.hr.http_status = 0;
166 0 : rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
167 : }
168 1 : break;
169 0 : case MHD_HTTP_BAD_REQUEST:
170 : /* This should never happen, either us or the exchange is buggy
171 : (or API version conflict); just pass JSON reply to the application */
172 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
173 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
174 0 : break;
175 5 : case MHD_HTTP_NOT_FOUND:
176 : /* Nothing really to verify, this should never
177 : happen, we should pass the JSON reply to the application */
178 5 : rs.hr.ec = TALER_JSON_get_error_code (j);
179 5 : rs.hr.hint = TALER_JSON_get_error_hint (j);
180 5 : break;
181 0 : case MHD_HTTP_CONFLICT:
182 : /* Nothing really to verify, this should never
183 : happen, we should pass the JSON reply to the application */
184 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
185 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
186 0 : break;
187 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
188 : /* Server had an internal issue; we should retry, but this API
189 : leaves this to the application */
190 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
191 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
192 0 : break;
193 0 : default:
194 : /* unexpected response code */
195 0 : GNUNET_break_op (0);
196 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
197 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
198 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
199 : "Unexpected response code %u/%d for reserves get_attestable\n",
200 : (unsigned int) response_code,
201 : (int) rs.hr.ec);
202 0 : break;
203 : }
204 6 : if (NULL != grah->cb)
205 : {
206 5 : grah->cb (grah->cb_cls,
207 : &rs);
208 5 : grah->cb = NULL;
209 : }
210 6 : TALER_EXCHANGE_get_reserves_attest_cancel (grah);
211 6 : }
212 :
213 :
214 : struct TALER_EXCHANGE_GetReservesAttestHandle *
215 6 : TALER_EXCHANGE_get_reserves_attest_create (
216 : struct GNUNET_CURL_Context *ctx,
217 : const char *url,
218 : const struct TALER_ReservePublicKeyP *reserve_pub)
219 : {
220 : struct TALER_EXCHANGE_GetReservesAttestHandle *grah;
221 :
222 6 : grah = GNUNET_new (struct TALER_EXCHANGE_GetReservesAttestHandle);
223 6 : grah->ctx = ctx;
224 6 : grah->base_url = GNUNET_strdup (url);
225 6 : grah->reserve_pub = *reserve_pub;
226 6 : return grah;
227 : }
228 :
229 :
230 : enum TALER_ErrorCode
231 6 : TALER_EXCHANGE_get_reserves_attest_start (
232 : struct TALER_EXCHANGE_GetReservesAttestHandle *grah,
233 : TALER_EXCHANGE_GetReservesAttestCallback cb,
234 : TALER_EXCHANGE_GET_RESERVES_ATTEST_RESULT_CLOSURE *cb_cls)
235 : {
236 : char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
237 : CURL *eh;
238 :
239 6 : if (NULL != grah->job)
240 : {
241 0 : GNUNET_break (0);
242 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
243 : }
244 6 : grah->cb = cb;
245 6 : grah->cb_cls = cb_cls;
246 : {
247 : char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
248 : char *end;
249 :
250 6 : end = GNUNET_STRINGS_data_to_string (
251 6 : &grah->reserve_pub,
252 : sizeof (grah->reserve_pub),
253 : pub_str,
254 : sizeof (pub_str));
255 6 : *end = '\0';
256 6 : GNUNET_snprintf (arg_str,
257 : sizeof (arg_str),
258 : "reserves/%s/attest",
259 : pub_str);
260 : }
261 6 : grah->url = TALER_url_join (grah->base_url,
262 : arg_str,
263 : NULL);
264 6 : if (NULL == grah->url)
265 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
266 6 : eh = TALER_EXCHANGE_curl_easy_get_ (grah->url);
267 6 : if (NULL == eh)
268 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
269 6 : grah->job = GNUNET_CURL_job_add (grah->ctx,
270 : eh,
271 : &handle_reserves_get_attestable_finished,
272 : grah);
273 6 : if (NULL == grah->job)
274 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
275 6 : return TALER_EC_NONE;
276 : }
277 :
278 :
279 : void
280 6 : TALER_EXCHANGE_get_reserves_attest_cancel (
281 : struct TALER_EXCHANGE_GetReservesAttestHandle *grah)
282 : {
283 6 : if (NULL != grah->job)
284 : {
285 0 : GNUNET_CURL_job_cancel (grah->job);
286 0 : grah->job = NULL;
287 : }
288 6 : GNUNET_free (grah->url);
289 6 : GNUNET_free (grah->base_url);
290 6 : GNUNET_free (grah);
291 6 : }
292 :
293 :
294 : /* end of exchange_api_get-reserves-RESERVE_PUB-attest.c */
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