Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2024-2026 Taler Systems SA
4 :
5 : TALER is free software; you can redistribute it and/or modify it under the
6 : terms of the GNU 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 src/lib/merchant_api_get-private-donau.c
19 : * @brief Implementation of the GET /private/donau request
20 : * @author Christian Grothoff
21 : */
22 : #include "platform.h"
23 : #include <curl/curl.h>
24 : #include <jansson.h>
25 : #include <microhttpd.h> /* just for HTTP status codes */
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include <taler/merchant/get-private-donau.h>
29 : #include "merchant_api_curl_defaults.h"
30 : #include <taler/taler_json_lib.h>
31 :
32 :
33 : /**
34 : * Maximum number of Donau instances permitted.
35 : */
36 : #define MAX_DONAU_INSTANCES 1024
37 :
38 :
39 : /**
40 : * Handle for a GET /private/donau operation.
41 : */
42 : struct TALER_MERCHANT_GetPrivateDonauHandle
43 : {
44 : /**
45 : * Base URL of the merchant backend.
46 : */
47 : char *base_url;
48 :
49 : /**
50 : * The full URL for this request.
51 : */
52 : char *url;
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_MERCHANT_GetPrivateDonauCallback cb;
63 :
64 : /**
65 : * Closure for @a cb.
66 : */
67 : TALER_MERCHANT_GET_PRIVATE_DONAU_RESULT_CLOSURE *cb_cls;
68 :
69 : /**
70 : * Reference to the execution context.
71 : */
72 : struct GNUNET_CURL_Context *ctx;
73 : };
74 :
75 :
76 : /**
77 : * Parse Donau instance information from @a ia.
78 : *
79 : * @param ia JSON array (or NULL!) with Donau instance data
80 : * @param[in] dgr partially filled response
81 : * @param gpdh operation handle
82 : * @return #GNUNET_OK on success
83 : */
84 : static enum GNUNET_GenericReturnValue
85 6 : parse_donau_instances (
86 : const json_t *ia,
87 : struct TALER_MERCHANT_GetPrivateDonauResponse *dgr,
88 : struct TALER_MERCHANT_GetPrivateDonauHandle *gpdh)
89 : {
90 6 : unsigned int instances_len = (unsigned int) json_array_size (ia);
91 :
92 6 : if ( (json_array_size (ia) != (size_t) instances_len) ||
93 : (instances_len > MAX_DONAU_INSTANCES) )
94 : {
95 0 : GNUNET_break (0);
96 0 : return GNUNET_SYSERR;
97 : }
98 6 : {
99 6 : struct TALER_MERCHANT_GetPrivateDonauDonauInstanceEntry instances[
100 6 : GNUNET_NZL (instances_len)];
101 6 : enum GNUNET_GenericReturnValue ret = GNUNET_OK;
102 : size_t index;
103 : json_t *value;
104 :
105 6 : memset (instances,
106 : 0,
107 : sizeof (instances));
108 10 : json_array_foreach (ia, index, value) {
109 4 : struct TALER_MERCHANT_GetPrivateDonauDonauInstanceEntry *instance =
110 : &instances[index];
111 4 : const json_t *donau_keys_json = NULL;
112 : struct GNUNET_JSON_Specification spec[] = {
113 4 : GNUNET_JSON_spec_uint64 ("donau_instance_serial",
114 : &instance->donau_instance_serial),
115 4 : TALER_JSON_spec_web_url ("donau_url",
116 : &instance->donau_url),
117 4 : GNUNET_JSON_spec_string ("charity_name",
118 : &instance->charity_name),
119 4 : GNUNET_JSON_spec_fixed_auto ("charity_pub_key",
120 : &instance->charity_pub_key),
121 4 : GNUNET_JSON_spec_uint64 ("charity_id",
122 : &instance->charity_id),
123 4 : TALER_JSON_spec_amount_any ("charity_max_per_year",
124 : &instance->charity_max_per_year),
125 4 : TALER_JSON_spec_amount_any ("charity_receipts_to_date",
126 : &instance->charity_receipts_to_date),
127 4 : GNUNET_JSON_spec_int64 ("current_year",
128 : &instance->current_year),
129 4 : GNUNET_JSON_spec_mark_optional (
130 : GNUNET_JSON_spec_object_const ("donau_keys_json",
131 : &donau_keys_json),
132 : NULL),
133 4 : GNUNET_JSON_spec_end ()
134 : };
135 :
136 4 : if (GNUNET_OK !=
137 4 : GNUNET_JSON_parse (value,
138 : spec,
139 : NULL, NULL))
140 : {
141 0 : GNUNET_break_op (0);
142 0 : ret = GNUNET_SYSERR;
143 0 : break;
144 : }
145 :
146 : /* Parse the Donau keys */
147 4 : if (NULL != donau_keys_json)
148 : {
149 2 : instance->donau_keys = DONAU_keys_from_json (donau_keys_json);
150 2 : if (NULL == instance->donau_keys)
151 : {
152 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
153 : "Failed to convert donau keys from JSON\n");
154 0 : ret = GNUNET_SYSERR;
155 0 : break;
156 : }
157 : }
158 : }
159 6 : if (GNUNET_OK == ret)
160 : {
161 6 : dgr->details.ok.donau_instances_length = instances_len;
162 6 : dgr->details.ok.donau_instances = instances;
163 6 : gpdh->cb (gpdh->cb_cls,
164 : dgr);
165 6 : gpdh->cb = NULL;
166 : }
167 10 : for (unsigned int i = 0; i < instances_len; i++)
168 4 : DONAU_keys_decref ((struct DONAU_Keys *) instances[i].donau_keys);
169 6 : return ret;
170 : }
171 : }
172 :
173 :
174 : /**
175 : * Function called when we're done processing the
176 : * HTTP GET /private/donau request.
177 : *
178 : * @param cls the `struct TALER_MERCHANT_GetPrivateDonauHandle`
179 : * @param response_code HTTP response code, 0 on error
180 : * @param response response body, NULL if not in JSON
181 : */
182 : static void
183 6 : handle_get_donau_finished (void *cls,
184 : long response_code,
185 : const void *response)
186 : {
187 6 : struct TALER_MERCHANT_GetPrivateDonauHandle *gpdh = cls;
188 6 : const json_t *json = response;
189 6 : struct TALER_MERCHANT_GetPrivateDonauResponse dgr = {
190 6 : .hr.http_status = (unsigned int) response_code,
191 : .hr.reply = json
192 : };
193 :
194 6 : gpdh->job = NULL;
195 6 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
196 : "Got /private/donau response with status code %u\n",
197 : (unsigned int) response_code);
198 6 : switch (response_code)
199 : {
200 6 : case MHD_HTTP_OK:
201 : {
202 : const json_t *donau_instances;
203 : struct GNUNET_JSON_Specification spec[] = {
204 6 : GNUNET_JSON_spec_array_const ("donau_instances",
205 : &donau_instances),
206 6 : GNUNET_JSON_spec_end ()
207 : };
208 :
209 6 : if (GNUNET_OK !=
210 6 : GNUNET_JSON_parse (json,
211 : spec,
212 : NULL, NULL))
213 : {
214 0 : dgr.hr.http_status = 0;
215 0 : dgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
216 0 : break;
217 : }
218 6 : if (GNUNET_OK ==
219 6 : parse_donau_instances (donau_instances,
220 : &dgr,
221 : gpdh))
222 : {
223 6 : TALER_MERCHANT_get_private_donau_cancel (gpdh);
224 6 : return;
225 : }
226 0 : dgr.hr.http_status = 0;
227 0 : dgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
228 0 : break;
229 : }
230 0 : case MHD_HTTP_UNAUTHORIZED:
231 : case MHD_HTTP_NOT_FOUND:
232 0 : dgr.hr.ec = TALER_JSON_get_error_code (json);
233 0 : dgr.hr.hint = TALER_JSON_get_error_hint (json);
234 0 : break;
235 0 : default:
236 0 : dgr.hr.ec = TALER_JSON_get_error_code (json);
237 0 : dgr.hr.hint = TALER_JSON_get_error_hint (json);
238 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
239 : "Unexpected response code %u/%d\n",
240 : (unsigned int) response_code,
241 : (int) dgr.hr.ec);
242 0 : break;
243 : }
244 0 : gpdh->cb (gpdh->cb_cls,
245 : &dgr);
246 0 : TALER_MERCHANT_get_private_donau_cancel (gpdh);
247 : }
248 :
249 :
250 : struct TALER_MERCHANT_GetPrivateDonauHandle *
251 6 : TALER_MERCHANT_get_private_donau_create (
252 : struct GNUNET_CURL_Context *ctx,
253 : const char *url)
254 : {
255 : struct TALER_MERCHANT_GetPrivateDonauHandle *gpdh;
256 :
257 6 : gpdh = GNUNET_new (struct TALER_MERCHANT_GetPrivateDonauHandle);
258 6 : gpdh->ctx = ctx;
259 6 : gpdh->base_url = GNUNET_strdup (url);
260 6 : return gpdh;
261 : }
262 :
263 :
264 : enum TALER_ErrorCode
265 6 : TALER_MERCHANT_get_private_donau_start (
266 : struct TALER_MERCHANT_GetPrivateDonauHandle *gpdh,
267 : TALER_MERCHANT_GetPrivateDonauCallback cb,
268 : TALER_MERCHANT_GET_PRIVATE_DONAU_RESULT_CLOSURE *cb_cls)
269 : {
270 : CURL *eh;
271 :
272 6 : gpdh->cb = cb;
273 6 : gpdh->cb_cls = cb_cls;
274 6 : gpdh->url = TALER_url_join (gpdh->base_url,
275 : "private/donau",
276 : NULL);
277 6 : if (NULL == gpdh->url)
278 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
279 6 : eh = TALER_MERCHANT_curl_easy_get_ (gpdh->url);
280 6 : if (NULL == eh)
281 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
282 6 : gpdh->job = GNUNET_CURL_job_add (gpdh->ctx,
283 : eh,
284 : &handle_get_donau_finished,
285 : gpdh);
286 6 : if (NULL == gpdh->job)
287 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
288 6 : return TALER_EC_NONE;
289 : }
290 :
291 :
292 : void
293 6 : TALER_MERCHANT_get_private_donau_cancel (
294 : struct TALER_MERCHANT_GetPrivateDonauHandle *gpdh)
295 : {
296 6 : if (NULL != gpdh->job)
297 : {
298 0 : GNUNET_CURL_job_cancel (gpdh->job);
299 0 : gpdh->job = NULL;
300 : }
301 6 : GNUNET_free (gpdh->url);
302 6 : GNUNET_free (gpdh->base_url);
303 6 : GNUNET_free (gpdh);
304 6 : }
305 :
306 :
307 : /* end of merchant_api_get-private-donau-new.c */
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