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 merchant_api_get-private-donau-new.c
19 : * @brief Implementation of the GET /private/donau request
20 : * @author Christian Grothoff
21 : */
22 : #include "taler/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 0 : parse_donau_instances (const json_t *ia,
86 : struct TALER_MERCHANT_GetPrivateDonauResponse *dgr,
87 : struct TALER_MERCHANT_GetPrivateDonauHandle *gpdh)
88 : {
89 0 : unsigned int instances_len = (unsigned int) json_array_size (ia);
90 0 : struct DONAU_Keys *donau_keys_ptr = NULL;
91 :
92 0 : 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 0 : {
99 0 : struct TALER_MERCHANT_GetPrivateDonauDonauInstanceEntry instances[
100 0 : GNUNET_NZL (instances_len)];
101 : size_t index;
102 : json_t *value;
103 :
104 0 : json_array_foreach (ia, index, value) {
105 0 : struct TALER_MERCHANT_GetPrivateDonauDonauInstanceEntry *instance =
106 : &instances[index];
107 0 : const json_t *donau_keys_json = NULL;
108 : struct GNUNET_JSON_Specification spec[] = {
109 0 : GNUNET_JSON_spec_uint64 ("donau_instance_serial",
110 : &instance->donau_instance_serial),
111 0 : GNUNET_JSON_spec_string ("donau_url",
112 : &instance->donau_url),
113 0 : GNUNET_JSON_spec_string ("charity_name",
114 : &instance->charity_name),
115 0 : GNUNET_JSON_spec_fixed_auto ("charity_pub_key",
116 : &instance->charity_pub_key),
117 0 : GNUNET_JSON_spec_uint64 ("charity_id",
118 : &instance->charity_id),
119 0 : TALER_JSON_spec_amount_any ("charity_max_per_year",
120 : &instance->charity_max_per_year),
121 0 : TALER_JSON_spec_amount_any ("charity_receipts_to_date",
122 : &instance->charity_receipts_to_date),
123 0 : GNUNET_JSON_spec_int64 ("current_year",
124 : &instance->current_year),
125 0 : GNUNET_JSON_spec_mark_optional (
126 : GNUNET_JSON_spec_object_const ("donau_keys_json",
127 : &donau_keys_json),
128 : NULL),
129 0 : GNUNET_JSON_spec_end ()
130 : };
131 :
132 0 : if (GNUNET_OK !=
133 0 : GNUNET_JSON_parse (value,
134 : spec,
135 : NULL, NULL))
136 : {
137 0 : GNUNET_break_op (0);
138 0 : return GNUNET_SYSERR;
139 : }
140 :
141 : /* Parse the Donau keys */
142 0 : if (NULL != donau_keys_json)
143 : {
144 0 : donau_keys_ptr = DONAU_keys_from_json (donau_keys_json);
145 0 : if (NULL == donau_keys_ptr)
146 : {
147 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
148 : "Failed to convert donau keys from JSON\n");
149 0 : return GNUNET_SYSERR;
150 : }
151 0 : instance->donau_keys = donau_keys_ptr;
152 : }
153 : }
154 0 : dgr->details.ok.donau_instances_length = instances_len;
155 0 : dgr->details.ok.donau_instances = instances;
156 0 : gpdh->cb (gpdh->cb_cls,
157 : dgr);
158 0 : gpdh->cb = NULL;
159 0 : if (NULL != donau_keys_ptr)
160 : {
161 0 : DONAU_keys_decref (donau_keys_ptr);
162 0 : donau_keys_ptr = NULL;
163 : }
164 : }
165 0 : return GNUNET_OK;
166 : }
167 :
168 :
169 : /**
170 : * Function called when we're done processing the
171 : * HTTP GET /private/donau request.
172 : *
173 : * @param cls the `struct TALER_MERCHANT_GetPrivateDonauHandle`
174 : * @param response_code HTTP response code, 0 on error
175 : * @param response response body, NULL if not in JSON
176 : */
177 : static void
178 0 : handle_get_donau_finished (void *cls,
179 : long response_code,
180 : const void *response)
181 : {
182 0 : struct TALER_MERCHANT_GetPrivateDonauHandle *gpdh = cls;
183 0 : const json_t *json = response;
184 0 : struct TALER_MERCHANT_GetPrivateDonauResponse dgr = {
185 0 : .hr.http_status = (unsigned int) response_code,
186 : .hr.reply = json
187 : };
188 :
189 0 : gpdh->job = NULL;
190 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
191 : "Got /private/donau response with status code %u\n",
192 : (unsigned int) response_code);
193 0 : switch (response_code)
194 : {
195 0 : case MHD_HTTP_OK:
196 : {
197 : const json_t *donau_instances;
198 : struct GNUNET_JSON_Specification spec[] = {
199 0 : GNUNET_JSON_spec_array_const ("donau_instances",
200 : &donau_instances),
201 0 : GNUNET_JSON_spec_end ()
202 : };
203 :
204 0 : if (GNUNET_OK !=
205 0 : GNUNET_JSON_parse (json,
206 : spec,
207 : NULL, NULL))
208 : {
209 0 : dgr.hr.http_status = 0;
210 0 : dgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
211 0 : break;
212 : }
213 0 : if (GNUNET_OK ==
214 0 : parse_donau_instances (donau_instances,
215 : &dgr,
216 : gpdh))
217 : {
218 0 : TALER_MERCHANT_get_private_donau_cancel (gpdh);
219 0 : return;
220 : }
221 0 : dgr.hr.http_status = 0;
222 0 : dgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
223 0 : break;
224 : }
225 0 : case MHD_HTTP_UNAUTHORIZED:
226 : case MHD_HTTP_NOT_FOUND:
227 0 : dgr.hr.ec = TALER_JSON_get_error_code (json);
228 0 : dgr.hr.hint = TALER_JSON_get_error_hint (json);
229 0 : break;
230 0 : default:
231 0 : dgr.hr.ec = TALER_JSON_get_error_code (json);
232 0 : dgr.hr.hint = TALER_JSON_get_error_hint (json);
233 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
234 : "Unexpected response code %u/%d\n",
235 : (unsigned int) response_code,
236 : (int) dgr.hr.ec);
237 0 : break;
238 : }
239 0 : gpdh->cb (gpdh->cb_cls,
240 : &dgr);
241 0 : TALER_MERCHANT_get_private_donau_cancel (gpdh);
242 : }
243 :
244 :
245 : struct TALER_MERCHANT_GetPrivateDonauHandle *
246 0 : TALER_MERCHANT_get_private_donau_create (
247 : struct GNUNET_CURL_Context *ctx,
248 : const char *url)
249 : {
250 : struct TALER_MERCHANT_GetPrivateDonauHandle *gpdh;
251 :
252 0 : gpdh = GNUNET_new (struct TALER_MERCHANT_GetPrivateDonauHandle);
253 0 : gpdh->ctx = ctx;
254 0 : gpdh->base_url = GNUNET_strdup (url);
255 0 : return gpdh;
256 : }
257 :
258 :
259 : enum TALER_ErrorCode
260 0 : TALER_MERCHANT_get_private_donau_start (
261 : struct TALER_MERCHANT_GetPrivateDonauHandle *gpdh,
262 : TALER_MERCHANT_GetPrivateDonauCallback cb,
263 : TALER_MERCHANT_GET_PRIVATE_DONAU_RESULT_CLOSURE *cb_cls)
264 : {
265 : CURL *eh;
266 :
267 0 : gpdh->cb = cb;
268 0 : gpdh->cb_cls = cb_cls;
269 0 : gpdh->url = TALER_url_join (gpdh->base_url,
270 : "private/donau",
271 : NULL);
272 0 : if (NULL == gpdh->url)
273 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
274 0 : eh = TALER_MERCHANT_curl_easy_get_ (gpdh->url);
275 0 : if (NULL == eh)
276 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
277 0 : gpdh->job = GNUNET_CURL_job_add (gpdh->ctx,
278 : eh,
279 : &handle_get_donau_finished,
280 : gpdh);
281 0 : if (NULL == gpdh->job)
282 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
283 0 : return TALER_EC_NONE;
284 : }
285 :
286 :
287 : void
288 0 : TALER_MERCHANT_get_private_donau_cancel (
289 : struct TALER_MERCHANT_GetPrivateDonauHandle *gpdh)
290 : {
291 0 : if (NULL != gpdh->job)
292 : {
293 0 : GNUNET_CURL_job_cancel (gpdh->job);
294 0 : gpdh->job = NULL;
295 : }
296 0 : GNUNET_free (gpdh->url);
297 0 : GNUNET_free (gpdh->base_url);
298 0 : GNUNET_free (gpdh);
299 0 : }
300 :
301 :
302 : /* end of merchant_api_get-private-donau-new.c */
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