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.c
19 : * @brief Implementation of the GET /reserves/$RESERVE_PUB requests
20 : * @author Christian Grothoff
21 : */
22 : #include "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_exchange_service.h"
29 : #include "taler_json_lib.h"
30 : #include "exchange_api_handle.h"
31 : #include "taler_signatures.h"
32 : #include "exchange_api_curl_defaults.h"
33 :
34 :
35 : /**
36 : * @brief A /reserves/ GET Handle
37 : */
38 : struct TALER_EXCHANGE_ReservesGetHandle
39 : {
40 :
41 : /**
42 : * The connection to exchange this request handle will use
43 : */
44 : struct TALER_EXCHANGE_Handle *exchange;
45 :
46 : /**
47 : * The url for this request.
48 : */
49 : char *url;
50 :
51 : /**
52 : * Handle for the request.
53 : */
54 : struct GNUNET_CURL_Job *job;
55 :
56 : /**
57 : * Function to call with the result.
58 : */
59 : TALER_EXCHANGE_ReservesGetCallback cb;
60 :
61 : /**
62 : * Public key of the reserve we are querying.
63 : */
64 : struct TALER_ReservePublicKeyP reserve_pub;
65 :
66 : /**
67 : * Closure for @a cb.
68 : */
69 : void *cb_cls;
70 :
71 : };
72 :
73 :
74 : /**
75 : * We received an #MHD_HTTP_OK status code. Handle the JSON
76 : * response.
77 : *
78 : * @param rgh handle of the request
79 : * @param j JSON response
80 : * @return #GNUNET_OK on success
81 : */
82 : static enum GNUNET_GenericReturnValue
83 0 : handle_reserves_get_ok (struct TALER_EXCHANGE_ReservesGetHandle *rgh,
84 : const json_t *j)
85 : {
86 0 : struct TALER_EXCHANGE_ReserveSummary rs = {
87 : .hr.reply = j,
88 : .hr.http_status = MHD_HTTP_OK
89 : };
90 : struct GNUNET_JSON_Specification spec[] = {
91 0 : TALER_JSON_spec_amount_any ("balance",
92 : &rs.details.ok.balance),
93 0 : GNUNET_JSON_spec_end ()
94 : };
95 :
96 0 : if (GNUNET_OK !=
97 0 : GNUNET_JSON_parse (j,
98 : spec,
99 : NULL,
100 : NULL))
101 : {
102 0 : GNUNET_break_op (0);
103 0 : return GNUNET_SYSERR;
104 : }
105 0 : rgh->cb (rgh->cb_cls,
106 : &rs);
107 0 : rgh->cb = NULL;
108 0 : return GNUNET_OK;
109 : }
110 :
111 :
112 : /**
113 : * Function called when we're done processing the
114 : * HTTP /reserves/ GET request.
115 : *
116 : * @param cls the `struct TALER_EXCHANGE_ReservesGetHandle`
117 : * @param response_code HTTP response code, 0 on error
118 : * @param response parsed JSON result, NULL on error
119 : */
120 : static void
121 0 : handle_reserves_get_finished (void *cls,
122 : long response_code,
123 : const void *response)
124 : {
125 0 : struct TALER_EXCHANGE_ReservesGetHandle *rgh = cls;
126 0 : const json_t *j = response;
127 0 : struct TALER_EXCHANGE_ReserveSummary rs = {
128 : .hr.reply = j,
129 0 : .hr.http_status = (unsigned int) response_code
130 : };
131 :
132 0 : rgh->job = NULL;
133 0 : switch (response_code)
134 : {
135 0 : case 0:
136 0 : rs.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
137 0 : break;
138 0 : case MHD_HTTP_OK:
139 0 : if (GNUNET_OK !=
140 0 : handle_reserves_get_ok (rgh,
141 : j))
142 : {
143 0 : rs.hr.http_status = 0;
144 0 : rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
145 : }
146 0 : break;
147 0 : case MHD_HTTP_BAD_REQUEST:
148 : /* This should never happen, either us or the exchange is buggy
149 : (or API version conflict); just pass JSON reply to the application */
150 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
151 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
152 0 : break;
153 0 : case MHD_HTTP_NOT_FOUND:
154 : /* Nothing really to verify, this should never
155 : happen, we should pass the JSON reply to the application */
156 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
157 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
158 0 : break;
159 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
160 : /* Server had an internal issue; we should retry, but this API
161 : leaves this to the application */
162 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
163 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
164 0 : break;
165 0 : default:
166 : /* unexpected response code */
167 0 : GNUNET_break_op (0);
168 0 : rs.hr.ec = TALER_JSON_get_error_code (j);
169 0 : rs.hr.hint = TALER_JSON_get_error_hint (j);
170 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
171 : "Unexpected response code %u/%d for reserves get\n",
172 : (unsigned int) response_code,
173 : (int) rs.hr.ec);
174 0 : break;
175 : }
176 0 : if (NULL != rgh->cb)
177 : {
178 0 : rgh->cb (rgh->cb_cls,
179 : &rs);
180 0 : rgh->cb = NULL;
181 : }
182 0 : TALER_EXCHANGE_reserves_get_cancel (rgh);
183 0 : }
184 :
185 :
186 : struct TALER_EXCHANGE_ReservesGetHandle *
187 0 : TALER_EXCHANGE_reserves_get (
188 : struct TALER_EXCHANGE_Handle *exchange,
189 : const struct TALER_ReservePublicKeyP *reserve_pub,
190 : struct GNUNET_TIME_Relative timeout,
191 : TALER_EXCHANGE_ReservesGetCallback cb,
192 : void *cb_cls)
193 : {
194 : struct TALER_EXCHANGE_ReservesGetHandle *rgh;
195 : struct GNUNET_CURL_Context *ctx;
196 : CURL *eh;
197 : char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 16 + 32];
198 :
199 0 : if (GNUNET_YES !=
200 0 : TEAH_handle_is_ready (exchange))
201 : {
202 0 : GNUNET_break (0);
203 0 : return NULL;
204 : }
205 : {
206 : char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
207 : char *end;
208 : char timeout_str[32];
209 :
210 0 : end = GNUNET_STRINGS_data_to_string (
211 : reserve_pub,
212 : sizeof (*reserve_pub),
213 : pub_str,
214 : sizeof (pub_str));
215 0 : *end = '\0';
216 0 : GNUNET_snprintf (timeout_str,
217 : sizeof (timeout_str),
218 : "%llu",
219 : (unsigned long long)
220 0 : (timeout.rel_value_us
221 0 : / GNUNET_TIME_UNIT_MILLISECONDS.rel_value_us));
222 0 : if (GNUNET_TIME_relative_is_zero (timeout))
223 0 : GNUNET_snprintf (arg_str,
224 : sizeof (arg_str),
225 : "/reserves/%s",
226 : pub_str);
227 : else
228 0 : GNUNET_snprintf (arg_str,
229 : sizeof (arg_str),
230 : "/reserves/%s?timeout_ms=%s",
231 : pub_str,
232 : timeout_str);
233 : }
234 0 : rgh = GNUNET_new (struct TALER_EXCHANGE_ReservesGetHandle);
235 0 : rgh->exchange = exchange;
236 0 : rgh->cb = cb;
237 0 : rgh->cb_cls = cb_cls;
238 0 : rgh->reserve_pub = *reserve_pub;
239 0 : rgh->url = TEAH_path_to_url (exchange,
240 : arg_str);
241 0 : if (NULL == rgh->url)
242 : {
243 0 : GNUNET_free (rgh);
244 0 : return NULL;
245 : }
246 0 : eh = TALER_EXCHANGE_curl_easy_get_ (rgh->url);
247 0 : if (NULL == eh)
248 : {
249 0 : GNUNET_break (0);
250 0 : GNUNET_free (rgh->url);
251 0 : GNUNET_free (rgh);
252 0 : return NULL;
253 : }
254 0 : ctx = TEAH_handle_to_context (exchange);
255 0 : rgh->job = GNUNET_CURL_job_add (ctx,
256 : eh,
257 : &handle_reserves_get_finished,
258 : rgh);
259 0 : return rgh;
260 : }
261 :
262 :
263 : void
264 0 : TALER_EXCHANGE_reserves_get_cancel (
265 : struct TALER_EXCHANGE_ReservesGetHandle *rgh)
266 : {
267 0 : if (NULL != rgh->job)
268 : {
269 0 : GNUNET_CURL_job_cancel (rgh->job);
270 0 : rgh->job = NULL;
271 : }
272 0 : GNUNET_free (rgh->url);
273 0 : GNUNET_free (rgh);
274 0 : }
275 :
276 :
277 : /* end of exchange_api_reserves_get.c */
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