Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2014-2022 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_reserves_get_attestable.c
19 : * @brief Implementation of the GET_ATTESTABLE /reserves/$RESERVE_PUB requests
20 : * @author Christian Grothoff
21 : */
22 : #include "taler/platform.h"
23 : #include <jansson.h>
24 : #include <microhttpd.h> /* just for HTTP status codes */
25 : #include <gnunet/gnunet_util_lib.h>
26 : #include <gnunet/gnunet_json_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include "taler/taler_exchange_service.h"
29 : #include "taler/taler_json_lib.h"
30 : #include "exchange_api_handle.h"
31 : #include "taler/taler_signatures.h"
32 : #include "exchange_api_curl_defaults.h"
33 :
34 :
35 : /**
36 : * @brief A /reserves/ GET_ATTESTABLE Handle
37 : */
38 : struct TALER_EXCHANGE_ReservesGetAttestHandle
39 : {
40 :
41 : /**
42 : * The url for this request.
43 : */
44 : char *url;
45 :
46 : /**
47 : * Handle for the request.
48 : */
49 : struct GNUNET_CURL_Job *job;
50 :
51 : /**
52 : * Function to call with the result.
53 : */
54 : TALER_EXCHANGE_ReservesGetAttestCallback cb;
55 :
56 : /**
57 : * Public key of the reserve we are querying.
58 : */
59 : struct TALER_ReservePublicKeyP reserve_pub;
60 :
61 : /**
62 : * Closure for @a cb.
63 : */
64 : void *cb_cls;
65 :
66 : };
67 :
68 :
69 : /**
70 : * We received an #MHD_HTTP_OK status code. Handle the JSON
71 : * response.
72 : *
73 : * @param rgah handle of the request
74 : * @param j JSON response
75 : * @return #GNUNET_OK on success
76 : */
77 : static enum GNUNET_GenericReturnValue
78 1 : handle_reserves_get_attestable_ok (
79 : struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah,
80 : const json_t *j)
81 : {
82 1 : struct TALER_EXCHANGE_ReserveGetAttestResult rs = {
83 : .hr.reply = j,
84 : .hr.http_status = MHD_HTTP_OK
85 : };
86 : const json_t *details;
87 : struct GNUNET_JSON_Specification spec[] = {
88 1 : GNUNET_JSON_spec_array_const ("details",
89 : &details),
90 1 : GNUNET_JSON_spec_end ()
91 : };
92 :
93 1 : if (GNUNET_OK !=
94 1 : GNUNET_JSON_parse (j,
95 : spec,
96 : NULL,
97 : NULL))
98 : {
99 0 : GNUNET_break_op (0);
100 0 : return GNUNET_SYSERR;
101 : }
102 1 : {
103 1 : unsigned int dlen = json_array_size (details);
104 1 : const char *attributes[GNUNET_NZL (dlen)];
105 :
106 4 : for (unsigned int i = 0; i<dlen; i++)
107 : {
108 3 : json_t *detail = json_array_get (details,
109 : i);
110 3 : attributes[i] = json_string_value (detail);
111 3 : if (NULL == attributes[i])
112 : {
113 0 : GNUNET_break_op (0);
114 0 : return GNUNET_SYSERR;
115 : }
116 : }
117 1 : rs.details.ok.attributes_length = dlen;
118 1 : rs.details.ok.attributes = attributes;
119 1 : rgah->cb (rgah->cb_cls,
120 : &rs);
121 1 : rgah->cb = NULL;
122 : }
123 1 : return GNUNET_OK;
124 : }
125 :
126 :
127 : /**
128 : * Function called when we're done processing the
129 : * HTTP GET /reserves-attest/$RID request.
130 : *
131 : * @param cls the `struct TALER_EXCHANGE_ReservesGetAttestableHandle`
132 : * @param response_code HTTP response code, 0 on error
133 : * @param response parsed JSON result, NULL on error
134 : */
135 : static void
136 6 : handle_reserves_get_attestable_finished (void *cls,
137 : long response_code,
138 : const void *response)
139 : {
140 6 : struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah = cls;
141 6 : const json_t *j = response;
142 6 : struct TALER_EXCHANGE_ReserveGetAttestResult rs = {
143 : .hr.reply = j,
144 6 : .hr.http_status = (unsigned int) response_code
145 : };
146 :
147 6 : rgah->job = NULL;
148 6 : switch (response_code)
149 : {
150 0 : case 0:
151 0 : rs.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
152 0 : break;
153 1 : case MHD_HTTP_OK:
154 1 : if (GNUNET_OK !=
155 1 : handle_reserves_get_attestable_ok (rgah,
156 : j))
157 : {
158 0 : rs.hr.http_status = 0;
159 0 : rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
160 : }
161 1 : break;
162 0 : case MHD_HTTP_BAD_REQUEST:
163 : /* This should never happen, either us or the exchange is buggy
164 : (or API version conflict); just pass JSON reply to the application */
165 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
166 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
167 0 : break;
168 5 : case MHD_HTTP_NOT_FOUND:
169 : /* Nothing really to verify, this should never
170 : happen, we should pass the JSON reply to the application */
171 5 : rs.hr.ec = TALER_JSON_get_error_code (j);
172 5 : rs.hr.hint = TALER_JSON_get_error_hint (j);
173 5 : break;
174 0 : case MHD_HTTP_CONFLICT:
175 : /* Nothing really to verify, this should never
176 : happen, we should pass the JSON reply to the application */
177 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
178 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
179 0 : break;
180 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
181 : /* Server had an internal issue; we should retry, but this API
182 : leaves this to the application */
183 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
184 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
185 0 : break;
186 0 : default:
187 : /* unexpected response code */
188 0 : GNUNET_break_op (0);
189 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
190 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
191 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
192 : "Unexpected response code %u/%d for reserves get_attestable\n",
193 : (unsigned int) response_code,
194 : (int) rs.hr.ec);
195 0 : break;
196 : }
197 6 : if (NULL != rgah->cb)
198 : {
199 5 : rgah->cb (rgah->cb_cls,
200 : &rs);
201 5 : rgah->cb = NULL;
202 : }
203 6 : TALER_EXCHANGE_reserves_get_attestable_cancel (rgah);
204 6 : }
205 :
206 :
207 : struct TALER_EXCHANGE_ReservesGetAttestHandle *
208 6 : TALER_EXCHANGE_reserves_get_attestable (
209 : struct GNUNET_CURL_Context *ctx,
210 : const char *url,
211 : const struct TALER_ReservePublicKeyP *reserve_pub,
212 : TALER_EXCHANGE_ReservesGetAttestCallback cb,
213 : void *cb_cls)
214 : {
215 : struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah;
216 : CURL *eh;
217 : char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
218 :
219 : {
220 : char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
221 : char *end;
222 :
223 6 : end = GNUNET_STRINGS_data_to_string (
224 : reserve_pub,
225 : sizeof (*reserve_pub),
226 : pub_str,
227 : sizeof (pub_str));
228 6 : *end = '\0';
229 6 : GNUNET_snprintf (arg_str,
230 : sizeof (arg_str),
231 : "reserves-attest/%s",
232 : pub_str);
233 : }
234 6 : rgah = GNUNET_new (struct TALER_EXCHANGE_ReservesGetAttestHandle);
235 6 : rgah->cb = cb;
236 6 : rgah->cb_cls = cb_cls;
237 6 : rgah->reserve_pub = *reserve_pub;
238 6 : rgah->url = TALER_url_join (url,
239 : arg_str,
240 : NULL);
241 6 : if (NULL == rgah->url)
242 : {
243 0 : GNUNET_free (rgah);
244 0 : return NULL;
245 : }
246 6 : eh = TALER_EXCHANGE_curl_easy_get_ (rgah->url);
247 6 : if (NULL == eh)
248 : {
249 0 : GNUNET_break (0);
250 0 : GNUNET_free (rgah->url);
251 0 : GNUNET_free (rgah);
252 0 : return NULL;
253 : }
254 6 : rgah->job = GNUNET_CURL_job_add (ctx,
255 : eh,
256 : &handle_reserves_get_attestable_finished,
257 : rgah);
258 6 : return rgah;
259 : }
260 :
261 :
262 : void
263 6 : TALER_EXCHANGE_reserves_get_attestable_cancel (
264 : struct TALER_EXCHANGE_ReservesGetAttestHandle *rgah)
265 : {
266 6 : if (NULL != rgah->job)
267 : {
268 0 : GNUNET_CURL_job_cancel (rgah->job);
269 0 : rgah->job = NULL;
270 : }
271 6 : GNUNET_free (rgah->url);
272 6 : GNUNET_free (rgah);
273 6 : }
274 :
275 :
276 : /* end of exchange_api_reserves_get_attestable.c */
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