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-drain.c
19 : * @brief functions to drain profits from an exchange account
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-drain.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_PostManagementDrainHandle
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_PostManagementDrainCallback cb;
60 :
61 : /**
62 : * Closure for @a cb.
63 : */
64 : TALER_EXCHANGE_POST_MANAGEMENT_DRAIN_RESULT_CLOSURE *cb_cls;
65 :
66 : /**
67 : * Reference to the execution context.
68 : */
69 : struct GNUNET_CURL_Context *ctx;
70 :
71 : /**
72 : * Wire transfer identifier to use.
73 : */
74 : struct TALER_WireTransferIdentifierRawP wtid;
75 :
76 : /**
77 : * Total to transfer.
78 : */
79 : struct TALER_Amount amount;
80 :
81 : /**
82 : * When was the request created.
83 : */
84 : struct GNUNET_TIME_Timestamp date;
85 :
86 : /**
87 : * Configuration section identifying account to debit.
88 : */
89 : char *account_section;
90 :
91 : /**
92 : * Payto URI of the account to credit.
93 : */
94 : char *payto_uri_str;
95 :
96 : /**
97 : * Signature affirming the operation.
98 : */
99 : struct TALER_MasterSignatureP master_sig;
100 :
101 : };
102 :
103 :
104 : /**
105 : * Function called when we're done processing the
106 : * HTTP POST /management/drain request.
107 : *
108 : * @param cls the `struct TALER_EXCHANGE_PostManagementDrainHandle`
109 : * @param response_code HTTP response code, 0 on error
110 : * @param response response body, NULL if not in JSON
111 : */
112 : static void
113 0 : handle_drain_finished (void *cls,
114 : long response_code,
115 : const void *response)
116 : {
117 0 : struct TALER_EXCHANGE_PostManagementDrainHandle *pmdh = cls;
118 0 : const json_t *json = response;
119 0 : struct TALER_EXCHANGE_PostManagementDrainResponse res = {
120 0 : .hr.http_status = (unsigned int) response_code,
121 : .hr.reply = json
122 : };
123 :
124 0 : pmdh->job = NULL;
125 0 : switch (response_code)
126 : {
127 0 : case MHD_HTTP_NO_CONTENT:
128 0 : break;
129 0 : case MHD_HTTP_FORBIDDEN:
130 0 : res.hr.ec = TALER_JSON_get_error_code (json);
131 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
132 0 : break;
133 0 : case MHD_HTTP_CONFLICT:
134 0 : res.hr.ec = TALER_JSON_get_error_code (json);
135 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
136 0 : break;
137 0 : case MHD_HTTP_PRECONDITION_FAILED:
138 0 : res.hr.ec = TALER_JSON_get_error_code (json);
139 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
140 0 : break;
141 0 : default:
142 : /* unexpected response code */
143 0 : GNUNET_break_op (0);
144 0 : res.hr.ec = TALER_JSON_get_error_code (json);
145 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
146 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
147 : "Unexpected response code %u/%d for exchange management drain profits\n",
148 : (unsigned int) response_code,
149 : (int) res.hr.ec);
150 0 : break;
151 : }
152 0 : if (NULL != pmdh->cb)
153 : {
154 0 : pmdh->cb (pmdh->cb_cls,
155 : &res);
156 0 : pmdh->cb = NULL;
157 : }
158 0 : TALER_EXCHANGE_post_management_drain_cancel (pmdh);
159 0 : }
160 :
161 :
162 : struct TALER_EXCHANGE_PostManagementDrainHandle *
163 0 : TALER_EXCHANGE_post_management_drain_create (
164 : struct GNUNET_CURL_Context *ctx,
165 : const char *url,
166 : const struct TALER_WireTransferIdentifierRawP *wtid,
167 : const struct TALER_Amount *amount,
168 : struct GNUNET_TIME_Timestamp date,
169 : const char *account_section,
170 : const struct TALER_FullPayto payto_uri,
171 : const struct TALER_MasterSignatureP *master_sig)
172 : {
173 : struct TALER_EXCHANGE_PostManagementDrainHandle *pmdh;
174 :
175 0 : pmdh = GNUNET_new (struct TALER_EXCHANGE_PostManagementDrainHandle);
176 0 : pmdh->ctx = ctx;
177 0 : pmdh->base_url = GNUNET_strdup (url);
178 0 : pmdh->wtid = *wtid;
179 0 : pmdh->amount = *amount;
180 0 : pmdh->date = date;
181 0 : pmdh->account_section = GNUNET_strdup (account_section);
182 0 : pmdh->payto_uri_str = GNUNET_strdup (payto_uri.full_payto);
183 0 : pmdh->master_sig = *master_sig;
184 0 : return pmdh;
185 : }
186 :
187 :
188 : enum TALER_ErrorCode
189 0 : TALER_EXCHANGE_post_management_drain_start (
190 : struct TALER_EXCHANGE_PostManagementDrainHandle *pmdh,
191 : TALER_EXCHANGE_PostManagementDrainCallback cb,
192 : TALER_EXCHANGE_POST_MANAGEMENT_DRAIN_RESULT_CLOSURE *cb_cls)
193 : {
194 : CURL *eh;
195 : json_t *body;
196 0 : struct TALER_FullPayto payto_uri = {
197 0 : .full_payto = pmdh->payto_uri_str
198 : };
199 :
200 0 : pmdh->cb = cb;
201 0 : pmdh->cb_cls = cb_cls;
202 0 : pmdh->url = TALER_url_join (pmdh->base_url,
203 : "management/drain",
204 : NULL);
205 0 : if (NULL == pmdh->url)
206 : {
207 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
208 : "Could not construct request URL.\n");
209 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
210 : }
211 0 : body = GNUNET_JSON_PACK (
212 : GNUNET_JSON_pack_string ("debit_account_section",
213 : pmdh->account_section),
214 : TALER_JSON_pack_full_payto ("credit_payto_uri",
215 : payto_uri),
216 : GNUNET_JSON_pack_data_auto ("wtid",
217 : &pmdh->wtid),
218 : GNUNET_JSON_pack_data_auto ("master_sig",
219 : &pmdh->master_sig),
220 : GNUNET_JSON_pack_timestamp ("date",
221 : pmdh->date),
222 : TALER_JSON_pack_amount ("amount",
223 : &pmdh->amount));
224 0 : eh = TALER_EXCHANGE_curl_easy_get_ (pmdh->url);
225 0 : if ( (NULL == eh) ||
226 : (GNUNET_OK !=
227 0 : TALER_curl_easy_post (&pmdh->post_ctx,
228 : eh,
229 : body)) )
230 : {
231 0 : GNUNET_break (0);
232 0 : if (NULL != eh)
233 0 : curl_easy_cleanup (eh);
234 0 : json_decref (body);
235 0 : GNUNET_free (pmdh->url);
236 0 : pmdh->url = NULL;
237 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
238 : }
239 0 : json_decref (body);
240 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
241 : "Requesting URL '%s'\n",
242 : pmdh->url);
243 0 : pmdh->job = GNUNET_CURL_job_add2 (pmdh->ctx,
244 : eh,
245 0 : pmdh->post_ctx.headers,
246 : &handle_drain_finished,
247 : pmdh);
248 0 : if (NULL == pmdh->job)
249 : {
250 0 : TALER_curl_easy_post_finished (&pmdh->post_ctx);
251 0 : GNUNET_free (pmdh->url);
252 0 : pmdh->url = NULL;
253 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
254 : }
255 0 : return TALER_EC_NONE;
256 : }
257 :
258 :
259 : void
260 0 : TALER_EXCHANGE_post_management_drain_cancel (
261 : struct TALER_EXCHANGE_PostManagementDrainHandle *pmdh)
262 : {
263 0 : if (NULL != pmdh->job)
264 : {
265 0 : GNUNET_CURL_job_cancel (pmdh->job);
266 0 : pmdh->job = NULL;
267 : }
268 0 : TALER_curl_easy_post_finished (&pmdh->post_ctx);
269 0 : GNUNET_free (pmdh->account_section);
270 0 : GNUNET_free (pmdh->payto_uri_str);
271 0 : GNUNET_free (pmdh->url);
272 0 : GNUNET_free (pmdh->base_url);
273 0 : GNUNET_free (pmdh);
274 0 : }
275 :
276 :
277 : /* end of exchange_api_post-management-drain.c */
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