Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2022 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_purse_delete.c
19 : * @brief Implementation of the client to delete a purse
20 : * into an account
21 : * @author Christian Grothoff
22 : */
23 : #include "platform.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_json_lib.h>
28 : #include <gnunet/gnunet_curl_lib.h>
29 : #include "taler_json_lib.h"
30 : #include "taler_exchange_service.h"
31 : #include "exchange_api_handle.h"
32 : #include "exchange_api_common.h"
33 : #include "taler_signatures.h"
34 : #include "exchange_api_curl_defaults.h"
35 :
36 :
37 : /**
38 : * @brief A purse delete with deposit handle
39 : */
40 : struct TALER_EXCHANGE_PurseDeleteHandle
41 : {
42 :
43 : /**
44 : * The url for this request.
45 : */
46 : char *url;
47 :
48 : /**
49 : * Handle for the request.
50 : */
51 : struct GNUNET_CURL_Job *job;
52 :
53 : /**
54 : * Function to call with the result.
55 : */
56 : TALER_EXCHANGE_PurseDeleteCallback cb;
57 :
58 : /**
59 : * Closure for @a cb.
60 : */
61 : void *cb_cls;
62 :
63 : /**
64 : * Header with the purse_sig.
65 : */
66 : struct curl_slist *xhdr;
67 : };
68 :
69 :
70 : /**
71 : * Function called when we're done processing the
72 : * HTTP DELETE /purse/$PID request.
73 : *
74 : * @param cls the `struct TALER_EXCHANGE_PurseDeleteHandle`
75 : * @param response_code HTTP response code, 0 on error
76 : * @param response parsed JSON result, NULL on error
77 : */
78 : static void
79 2 : handle_purse_delete_finished (void *cls,
80 : long response_code,
81 : const void *response)
82 : {
83 2 : struct TALER_EXCHANGE_PurseDeleteHandle *pdh = cls;
84 2 : const json_t *j = response;
85 2 : struct TALER_EXCHANGE_PurseDeleteResponse dr = {
86 : .hr.reply = j,
87 2 : .hr.http_status = (unsigned int) response_code
88 : };
89 :
90 2 : pdh->job = NULL;
91 2 : switch (response_code)
92 : {
93 0 : case 0:
94 0 : dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
95 0 : break;
96 2 : case MHD_HTTP_NO_CONTENT:
97 2 : break;
98 0 : case MHD_HTTP_BAD_REQUEST:
99 : /* This should never happen, either us or the exchange is buggy
100 : (or API version conflict); just pass JSON reply to the application */
101 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
102 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
103 0 : break;
104 0 : case MHD_HTTP_FORBIDDEN:
105 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
106 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
107 : /* Nothing really to verify, exchange says one of the signatures is
108 : invalid; as we checked them, this should never happen, we
109 : should pass the JSON reply to the application */
110 0 : break;
111 0 : case MHD_HTTP_NOT_FOUND:
112 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
113 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
114 : /* Nothing really to verify, this should never
115 : happen, we should pass the JSON reply to the application */
116 0 : break;
117 0 : case MHD_HTTP_CONFLICT:
118 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
119 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
120 0 : break;
121 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
122 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
123 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
124 : /* Server had an internal issue; we should retry, but this API
125 : leaves this to the application */
126 0 : break;
127 0 : default:
128 : /* unexpected response code */
129 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
130 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
131 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
132 : "Unexpected response code %u/%d for exchange deposit\n",
133 : (unsigned int) response_code,
134 : dr.hr.ec);
135 0 : GNUNET_break_op (0);
136 0 : break;
137 : }
138 2 : pdh->cb (pdh->cb_cls,
139 : &dr);
140 2 : TALER_EXCHANGE_purse_delete_cancel (pdh);
141 2 : }
142 :
143 :
144 : struct TALER_EXCHANGE_PurseDeleteHandle *
145 2 : TALER_EXCHANGE_purse_delete (
146 : struct GNUNET_CURL_Context *ctx,
147 : const char *url,
148 : const struct TALER_PurseContractPrivateKeyP *purse_priv,
149 : TALER_EXCHANGE_PurseDeleteCallback cb,
150 : void *cb_cls)
151 : {
152 : struct TALER_EXCHANGE_PurseDeleteHandle *pdh;
153 : CURL *eh;
154 : struct TALER_PurseContractPublicKeyP purse_pub;
155 : struct TALER_PurseContractSignatureP purse_sig;
156 : char arg_str[sizeof (purse_pub) * 2 + 32];
157 :
158 2 : pdh = GNUNET_new (struct TALER_EXCHANGE_PurseDeleteHandle);
159 2 : pdh->cb = cb;
160 2 : pdh->cb_cls = cb_cls;
161 2 : GNUNET_CRYPTO_eddsa_key_get_public (&purse_priv->eddsa_priv,
162 : &purse_pub.eddsa_pub);
163 : {
164 : char pub_str[sizeof (purse_pub) * 2];
165 : char *end;
166 :
167 2 : end = GNUNET_STRINGS_data_to_string (&purse_pub,
168 : sizeof (purse_pub),
169 : pub_str,
170 : sizeof (pub_str));
171 2 : *end = '\0';
172 2 : GNUNET_snprintf (arg_str,
173 : sizeof (arg_str),
174 : "purses/%s",
175 : pub_str);
176 : }
177 2 : pdh->url = TALER_url_join (url,
178 : arg_str,
179 : NULL);
180 2 : if (NULL == pdh->url)
181 : {
182 0 : GNUNET_break (0);
183 0 : GNUNET_free (pdh);
184 0 : return NULL;
185 : }
186 2 : TALER_wallet_purse_delete_sign (purse_priv,
187 : &purse_sig);
188 : {
189 : char *delete_str;
190 : char *xhdr;
191 :
192 : delete_str =
193 2 : GNUNET_STRINGS_data_to_string_alloc (&purse_sig,
194 : sizeof (purse_sig));
195 2 : GNUNET_asprintf (&xhdr,
196 : "Taler-Purse-Signature: %s",
197 : delete_str);
198 2 : GNUNET_free (delete_str);
199 2 : pdh->xhdr = curl_slist_append (NULL,
200 : xhdr);
201 2 : GNUNET_free (xhdr);
202 : }
203 2 : eh = TALER_EXCHANGE_curl_easy_get_ (pdh->url);
204 2 : if (NULL == eh)
205 : {
206 0 : GNUNET_break (0);
207 0 : curl_slist_free_all (pdh->xhdr);
208 0 : GNUNET_free (pdh->url);
209 0 : GNUNET_free (pdh);
210 0 : return NULL;
211 : }
212 2 : GNUNET_assert (CURLE_OK ==
213 : curl_easy_setopt (eh,
214 : CURLOPT_CUSTOMREQUEST,
215 : MHD_HTTP_METHOD_DELETE));
216 2 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
217 : "URL for purse delete: `%s'\n",
218 : pdh->url);
219 4 : pdh->job = GNUNET_CURL_job_add2 (ctx,
220 : eh,
221 2 : pdh->xhdr,
222 : &handle_purse_delete_finished,
223 : pdh);
224 2 : return pdh;
225 : }
226 :
227 :
228 : void
229 2 : TALER_EXCHANGE_purse_delete_cancel (
230 : struct TALER_EXCHANGE_PurseDeleteHandle *pdh)
231 : {
232 2 : if (NULL != pdh->job)
233 : {
234 0 : GNUNET_CURL_job_cancel (pdh->job);
235 0 : pdh->job = NULL;
236 : }
237 2 : curl_slist_free_all (pdh->xhdr);
238 2 : GNUNET_free (pdh->url);
239 2 : GNUNET_free (pdh);
240 2 : }
241 :
242 :
243 : /* end of exchange_api_purse_delete.c */
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