Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2022-2026 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_delete-purses-PURSE_PUB.c
19 : * @brief Implementation of the client to delete a purse
20 : * @author Christian Grothoff
21 : */
22 : #include "taler/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/taler_json_lib.h"
29 : #include "taler/taler_exchange_service.h"
30 : #include "exchange_api_handle.h"
31 : #include "exchange_api_common.h"
32 : #include "taler/taler_signatures.h"
33 : #include "exchange_api_curl_defaults.h"
34 :
35 :
36 : /**
37 : * @brief A purse delete handle
38 : */
39 : struct TALER_EXCHANGE_DeletePursesHandle
40 : {
41 :
42 : /**
43 : * The base url for this request.
44 : */
45 : char *base_url;
46 :
47 : /**
48 : * The full url for this request, set during _start.
49 : */
50 : char *url;
51 :
52 : /**
53 : * Handle for the request.
54 : */
55 : struct GNUNET_CURL_Job *job;
56 :
57 : /**
58 : * Function to call with the result.
59 : */
60 : TALER_EXCHANGE_DeletePursesCallback cb;
61 :
62 : /**
63 : * Closure for @a cb.
64 : */
65 : TALER_EXCHANGE_DELETE_PURSES_RESULT_CLOSURE *cb_cls;
66 :
67 : /**
68 : * Reference to the execution context.
69 : */
70 : struct GNUNET_CURL_Context *ctx;
71 :
72 : /**
73 : * Header with the purse_sig.
74 : */
75 : struct curl_slist *xhdr;
76 :
77 : /**
78 : * Public key of the purse (derived from private key in _create).
79 : */
80 : struct TALER_PurseContractPublicKeyP purse_pub;
81 : };
82 :
83 :
84 : /**
85 : * Function called when we're done processing the
86 : * HTTP DELETE /purse/$PID request.
87 : *
88 : * @param cls the `struct TALER_EXCHANGE_DeletePursesHandle`
89 : * @param response_code HTTP response code, 0 on error
90 : * @param response parsed JSON result, NULL on error
91 : */
92 : static void
93 2 : handle_purse_delete_finished (void *cls,
94 : long response_code,
95 : const void *response)
96 : {
97 2 : struct TALER_EXCHANGE_DeletePursesHandle *dph = cls;
98 2 : const json_t *j = response;
99 2 : struct TALER_EXCHANGE_DeletePursesResponse dr = {
100 : .hr.reply = j,
101 2 : .hr.http_status = (unsigned int) response_code
102 : };
103 :
104 2 : dph->job = NULL;
105 2 : switch (response_code)
106 : {
107 0 : case 0:
108 0 : dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
109 0 : break;
110 2 : case MHD_HTTP_NO_CONTENT:
111 2 : break;
112 0 : case MHD_HTTP_BAD_REQUEST:
113 : /* This should never happen, either us or the exchange is buggy
114 : (or API version conflict); just pass JSON reply to the application */
115 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
116 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
117 0 : break;
118 0 : case MHD_HTTP_FORBIDDEN:
119 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
120 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
121 : /* Nothing really to verify, exchange says one of the signatures is
122 : invalid; as we checked them, this should never happen, we
123 : should pass the JSON reply to the application */
124 0 : break;
125 0 : case MHD_HTTP_NOT_FOUND:
126 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
127 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
128 : /* Nothing really to verify, this should never
129 : happen, we should pass the JSON reply to the application */
130 0 : break;
131 0 : case MHD_HTTP_CONFLICT:
132 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
133 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
134 0 : break;
135 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
136 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
137 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
138 : /* Server had an internal issue; we should retry, but this API
139 : leaves this to the application */
140 0 : break;
141 0 : default:
142 : /* unexpected response code */
143 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
144 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
145 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
146 : "Unexpected response code %u/%d for exchange purse delete\n",
147 : (unsigned int) response_code,
148 : dr.hr.ec);
149 0 : GNUNET_break_op (0);
150 0 : break;
151 : }
152 2 : dph->cb (dph->cb_cls,
153 : &dr);
154 2 : TALER_EXCHANGE_delete_purses_cancel (dph);
155 2 : }
156 :
157 :
158 : struct TALER_EXCHANGE_DeletePursesHandle *
159 2 : TALER_EXCHANGE_delete_purses_create (
160 : struct GNUNET_CURL_Context *ctx,
161 : const char *url,
162 : const struct TALER_PurseContractPrivateKeyP *purse_priv)
163 : {
164 : struct TALER_EXCHANGE_DeletePursesHandle *dph;
165 : struct TALER_PurseContractSignatureP purse_sig;
166 :
167 2 : dph = GNUNET_new (struct TALER_EXCHANGE_DeletePursesHandle);
168 2 : dph->ctx = ctx;
169 2 : dph->base_url = GNUNET_strdup (url);
170 2 : GNUNET_CRYPTO_eddsa_key_get_public (&purse_priv->eddsa_priv,
171 : &dph->purse_pub.eddsa_pub);
172 2 : TALER_wallet_purse_delete_sign (purse_priv,
173 : &purse_sig);
174 : {
175 : char *delete_str;
176 : char *xhdr;
177 :
178 : delete_str =
179 2 : GNUNET_STRINGS_data_to_string_alloc (&purse_sig,
180 : sizeof (purse_sig));
181 2 : GNUNET_asprintf (&xhdr,
182 : "Taler-Purse-Signature: %s",
183 : delete_str);
184 2 : GNUNET_free (delete_str);
185 2 : dph->xhdr = curl_slist_append (NULL,
186 : xhdr);
187 2 : GNUNET_free (xhdr);
188 : }
189 2 : return dph;
190 : }
191 :
192 :
193 : enum TALER_ErrorCode
194 2 : TALER_EXCHANGE_delete_purses_start (
195 : struct TALER_EXCHANGE_DeletePursesHandle *dph,
196 : TALER_EXCHANGE_DeletePursesCallback cb,
197 : TALER_EXCHANGE_DELETE_PURSES_RESULT_CLOSURE *cb_cls)
198 : {
199 : CURL *eh;
200 : char arg_str[sizeof (dph->purse_pub) * 2 + 32];
201 :
202 2 : dph->cb = cb;
203 2 : dph->cb_cls = cb_cls;
204 : {
205 : char pub_str[sizeof (dph->purse_pub) * 2];
206 : char *end;
207 :
208 2 : end = GNUNET_STRINGS_data_to_string (&dph->purse_pub,
209 : sizeof (dph->purse_pub),
210 : pub_str,
211 : sizeof (pub_str));
212 2 : *end = '\0';
213 2 : GNUNET_snprintf (arg_str,
214 : sizeof (arg_str),
215 : "purses/%s",
216 : pub_str);
217 : }
218 2 : dph->url = TALER_url_join (dph->base_url,
219 : arg_str,
220 : NULL);
221 2 : if (NULL == dph->url)
222 : {
223 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
224 : "Could not construct request URL.\n");
225 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
226 : }
227 2 : eh = TALER_EXCHANGE_curl_easy_get_ (dph->url);
228 2 : if (NULL == eh)
229 : {
230 0 : GNUNET_break (0);
231 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
232 : }
233 2 : GNUNET_assert (CURLE_OK ==
234 : curl_easy_setopt (eh,
235 : CURLOPT_CUSTOMREQUEST,
236 : MHD_HTTP_METHOD_DELETE));
237 2 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
238 : "URL for purse delete: `%s'\n",
239 : dph->url);
240 4 : dph->job = GNUNET_CURL_job_add2 (dph->ctx,
241 : eh,
242 2 : dph->xhdr,
243 : &handle_purse_delete_finished,
244 : dph);
245 2 : if (NULL == dph->job)
246 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
247 2 : return TALER_EC_NONE;
248 : }
249 :
250 :
251 : void
252 2 : TALER_EXCHANGE_delete_purses_cancel (
253 : struct TALER_EXCHANGE_DeletePursesHandle *dph)
254 : {
255 2 : if (NULL != dph->job)
256 : {
257 0 : GNUNET_CURL_job_cancel (dph->job);
258 0 : dph->job = NULL;
259 : }
260 2 : curl_slist_free_all (dph->xhdr);
261 2 : GNUNET_free (dph->url);
262 2 : GNUNET_free (dph->base_url);
263 2 : GNUNET_free (dph);
264 2 : }
265 :
266 :
267 : /* end of exchange_api_delete-purses-PURSE_PUB.c */
|
