Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2020-2026 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_post-management-global-fees.c
19 : * @brief functions to set global fees at an exchange
20 : * @author Christian Grothoff
21 : */
22 : #include "taler/platform.h"
23 : #include "taler/taler_json_lib.h"
24 : #include <gnunet/gnunet_curl_lib.h>
25 : #include <microhttpd.h>
26 : #include "taler/taler_exchange_service.h"
27 : #include "taler/taler-exchange/post-management-global-fees.h"
28 : #include "exchange_api_curl_defaults.h"
29 : #include "taler/taler_signatures.h"
30 : #include "taler/taler_curl_lib.h"
31 :
32 :
33 : struct TALER_EXCHANGE_PostManagementGlobalFeesHandle
34 : {
35 :
36 : /**
37 : * The base URL for this request.
38 : */
39 : char *base_url;
40 :
41 : /**
42 : * The full URL for this request, set during _start.
43 : */
44 : char *url;
45 :
46 : /**
47 : * Minor context that holds body and headers.
48 : */
49 : struct TALER_CURL_PostContext post_ctx;
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_PostManagementGlobalFeesCallback cb;
60 :
61 : /**
62 : * Closure for @a cb.
63 : */
64 : TALER_EXCHANGE_POST_MANAGEMENT_GLOBAL_FEES_RESULT_CLOSURE *cb_cls;
65 :
66 : /**
67 : * Reference to the execution context.
68 : */
69 : struct GNUNET_CURL_Context *ctx;
70 :
71 : /**
72 : * Start of validity period.
73 : */
74 : struct GNUNET_TIME_Timestamp validity_start;
75 :
76 : /**
77 : * End of validity period.
78 : */
79 : struct GNUNET_TIME_Timestamp validity_end;
80 :
81 : /**
82 : * Global fees for this time period.
83 : */
84 : struct TALER_GlobalFeeSet fees;
85 :
86 : /**
87 : * When do purses time out.
88 : */
89 : struct GNUNET_TIME_Relative purse_timeout;
90 :
91 : /**
92 : * How long are account histories preserved.
93 : */
94 : struct GNUNET_TIME_Relative history_expiration;
95 :
96 : /**
97 : * How many purses are free per account.
98 : */
99 : uint32_t purse_account_limit;
100 :
101 : /**
102 : * Signature affirming the global fees.
103 : */
104 : struct TALER_MasterSignatureP master_sig;
105 :
106 : };
107 :
108 :
109 : /**
110 : * Function called when we're done processing the
111 : * HTTP POST /management/global-fees request.
112 : *
113 : * @param cls the `struct TALER_EXCHANGE_PostManagementGlobalFeesHandle`
114 : * @param response_code HTTP response code, 0 on error
115 : * @param response response body, NULL if not in JSON
116 : */
117 : static void
118 34 : handle_global_fees_finished (void *cls,
119 : long response_code,
120 : const void *response)
121 : {
122 34 : struct TALER_EXCHANGE_PostManagementGlobalFeesHandle *pmgfh = cls;
123 34 : const json_t *json = response;
124 34 : struct TALER_EXCHANGE_PostManagementGlobalFeesResponse res = {
125 34 : .hr.http_status = (unsigned int) response_code,
126 : .hr.reply = json
127 : };
128 :
129 34 : pmgfh->job = NULL;
130 34 : switch (response_code)
131 : {
132 34 : case MHD_HTTP_NO_CONTENT:
133 34 : break;
134 0 : case MHD_HTTP_FORBIDDEN:
135 0 : res.hr.ec = TALER_JSON_get_error_code (json);
136 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
137 0 : break;
138 0 : case MHD_HTTP_NOT_FOUND:
139 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
140 : "Server did not find handler at `%s'. Did you configure the correct exchange base URL?\n",
141 : pmgfh->url);
142 0 : if (NULL != json)
143 : {
144 0 : res.hr.ec = TALER_JSON_get_error_code (json);
145 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
146 : }
147 : else
148 : {
149 0 : res.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
150 0 : res.hr.hint = TALER_ErrorCode_get_hint (res.hr.ec);
151 : }
152 0 : break;
153 0 : case MHD_HTTP_CONFLICT:
154 0 : res.hr.ec = TALER_JSON_get_error_code (json);
155 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
156 0 : break;
157 0 : case MHD_HTTP_PRECONDITION_FAILED:
158 0 : res.hr.ec = TALER_JSON_get_error_code (json);
159 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
160 0 : break;
161 0 : default:
162 : /* unexpected response code */
163 0 : GNUNET_break_op (0);
164 0 : res.hr.ec = TALER_JSON_get_error_code (json);
165 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
166 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
167 : "Unexpected response code %u/%d for exchange management set global fee\n",
168 : (unsigned int) response_code,
169 : (int) res.hr.ec);
170 0 : break;
171 : }
172 34 : if (NULL != pmgfh->cb)
173 : {
174 34 : pmgfh->cb (pmgfh->cb_cls,
175 : &res);
176 34 : pmgfh->cb = NULL;
177 : }
178 34 : TALER_EXCHANGE_post_management_global_fees_cancel (pmgfh);
179 34 : }
180 :
181 :
182 : struct TALER_EXCHANGE_PostManagementGlobalFeesHandle *
183 34 : TALER_EXCHANGE_post_management_global_fees_create (
184 : struct GNUNET_CURL_Context *ctx,
185 : const char *exchange_base_url,
186 : struct GNUNET_TIME_Timestamp validity_start,
187 : struct GNUNET_TIME_Timestamp validity_end,
188 : const struct TALER_GlobalFeeSet *fees,
189 : struct GNUNET_TIME_Relative purse_timeout,
190 : struct GNUNET_TIME_Relative history_expiration,
191 : uint32_t purse_account_limit,
192 : const struct TALER_MasterSignatureP *master_sig)
193 : {
194 : struct TALER_EXCHANGE_PostManagementGlobalFeesHandle *pmgfh;
195 :
196 34 : pmgfh = GNUNET_new (struct TALER_EXCHANGE_PostManagementGlobalFeesHandle);
197 34 : pmgfh->ctx = ctx;
198 34 : pmgfh->base_url = GNUNET_strdup (exchange_base_url);
199 34 : pmgfh->validity_start = validity_start;
200 34 : pmgfh->validity_end = validity_end;
201 34 : pmgfh->fees = *fees;
202 34 : pmgfh->purse_timeout = purse_timeout;
203 34 : pmgfh->history_expiration = history_expiration;
204 34 : pmgfh->purse_account_limit = purse_account_limit;
205 34 : pmgfh->master_sig = *master_sig;
206 34 : return pmgfh;
207 : }
208 :
209 :
210 : enum TALER_ErrorCode
211 34 : TALER_EXCHANGE_post_management_global_fees_start (
212 : struct TALER_EXCHANGE_PostManagementGlobalFeesHandle *pmgfh,
213 : TALER_EXCHANGE_PostManagementGlobalFeesCallback cb,
214 : TALER_EXCHANGE_POST_MANAGEMENT_GLOBAL_FEES_RESULT_CLOSURE *cb_cls)
215 : {
216 : CURL *eh;
217 : json_t *body;
218 :
219 34 : pmgfh->cb = cb;
220 34 : pmgfh->cb_cls = cb_cls;
221 34 : pmgfh->url = TALER_url_join (pmgfh->base_url,
222 : "management/global-fee",
223 : NULL);
224 34 : if (NULL == pmgfh->url)
225 : {
226 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
227 : "Could not construct request URL.\n");
228 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
229 : }
230 34 : body = GNUNET_JSON_PACK (
231 : GNUNET_JSON_pack_data_auto ("master_sig",
232 : &pmgfh->master_sig),
233 : GNUNET_JSON_pack_timestamp ("fee_start",
234 : pmgfh->validity_start),
235 : GNUNET_JSON_pack_timestamp ("fee_end",
236 : pmgfh->validity_end),
237 : TALER_JSON_pack_amount ("history_fee",
238 : &pmgfh->fees.history),
239 : TALER_JSON_pack_amount ("account_fee",
240 : &pmgfh->fees.account),
241 : TALER_JSON_pack_amount ("purse_fee",
242 : &pmgfh->fees.purse),
243 : GNUNET_JSON_pack_time_rel ("purse_timeout",
244 : pmgfh->purse_timeout),
245 : GNUNET_JSON_pack_time_rel ("history_expiration",
246 : pmgfh->history_expiration),
247 : GNUNET_JSON_pack_uint64 ("purse_account_limit",
248 : pmgfh->purse_account_limit));
249 34 : eh = TALER_EXCHANGE_curl_easy_get_ (pmgfh->url);
250 68 : if ( (NULL == eh) ||
251 : (GNUNET_OK !=
252 34 : TALER_curl_easy_post (&pmgfh->post_ctx,
253 : eh,
254 : body)) )
255 : {
256 0 : GNUNET_break (0);
257 0 : if (NULL != eh)
258 0 : curl_easy_cleanup (eh);
259 0 : json_decref (body);
260 0 : GNUNET_free (pmgfh->url);
261 0 : pmgfh->url = NULL;
262 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
263 : }
264 34 : json_decref (body);
265 34 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
266 : "Requesting URL '%s'\n",
267 : pmgfh->url);
268 68 : pmgfh->job = GNUNET_CURL_job_add2 (pmgfh->ctx,
269 : eh,
270 34 : pmgfh->post_ctx.headers,
271 : &handle_global_fees_finished,
272 : pmgfh);
273 34 : if (NULL == pmgfh->job)
274 : {
275 0 : GNUNET_break (0);
276 0 : TALER_curl_easy_post_finished (&pmgfh->post_ctx);
277 0 : GNUNET_free (pmgfh->url);
278 0 : pmgfh->url = NULL;
279 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
280 : }
281 34 : return TALER_EC_NONE;
282 : }
283 :
284 :
285 : void
286 34 : TALER_EXCHANGE_post_management_global_fees_cancel (
287 : struct TALER_EXCHANGE_PostManagementGlobalFeesHandle *pmgfh)
288 : {
289 34 : if (NULL != pmgfh->job)
290 : {
291 0 : GNUNET_CURL_job_cancel (pmgfh->job);
292 0 : pmgfh->job = NULL;
293 : }
294 34 : TALER_curl_easy_post_finished (&pmgfh->post_ctx);
295 34 : GNUNET_free (pmgfh->url);
296 34 : GNUNET_free (pmgfh->base_url);
297 34 : GNUNET_free (pmgfh);
298 34 : }
299 :
300 :
301 : /* end of exchange_api_post-management-global-fees.c */
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