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