Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2014-2018, 2020 Taler Systems SA
4 :
5 : TALER is free software; you can redistribute it and/or modify it under the
6 : terms of the GNU Lesser General Public License as published by the Free Software
7 : Foundation; either version 2.1, 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 Lesser General Public License for more details.
12 :
13 : You should have received a copy of the GNU Lesser General Public License along with
14 : TALER; see the file COPYING.LGPL. If not, see
15 : <http://www.gnu.org/licenses/>
16 : */
17 : /**
18 : * @file lib/merchant_api_delete_instance.c
19 : * @brief Implementation of the DELETE /instance/$ID request of the merchant's HTTP API
20 : * @author Christian Grothoff
21 : */
22 : #include "platform.h"
23 : #include <curl/curl.h>
24 : #include <jansson.h>
25 : #include <microhttpd.h> /* just for HTTP status codes */
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include "taler_merchant_service.h"
29 : #include <taler/taler_json_lib.h>
30 : #include <taler/taler_signatures.h>
31 :
32 :
33 : /**
34 : * Handle for a DELETE /instances/$ID operation.
35 : */
36 : struct TALER_MERCHANT_InstanceDeleteHandle
37 : {
38 : /**
39 : * The url for this request.
40 : */
41 : char *url;
42 :
43 : /**
44 : * Handle for the request.
45 : */
46 : struct GNUNET_CURL_Job *job;
47 :
48 : /**
49 : * Function to call with the result.
50 : */
51 : TALER_MERCHANT_InstanceDeleteCallback cb;
52 :
53 : /**
54 : * Closure for @a cb.
55 : */
56 : void *cb_cls;
57 :
58 : /**
59 : * Reference to the execution context.
60 : */
61 : struct GNUNET_CURL_Context *ctx;
62 :
63 : };
64 :
65 :
66 : /**
67 : * Function called when we're done processing the
68 : * HTTP GET /instances/$ID request.
69 : *
70 : * @param cls the `struct TALER_MERCHANT_InstanceDeleteHandle`
71 : * @param response_code HTTP response code, 0 on error
72 : * @param json response body, NULL if not in JSON
73 : */
74 : static void
75 0 : handle_delete_instance_finished (void *cls,
76 : long response_code,
77 : const void *response)
78 : {
79 0 : struct TALER_MERCHANT_InstanceDeleteHandle *idh = cls;
80 0 : const json_t *json = response;
81 0 : struct TALER_MERCHANT_HttpResponse hr = {
82 0 : .http_status = (unsigned int) response_code,
83 : .reply = json
84 : };
85 :
86 0 : idh->job = NULL;
87 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
88 : "Got /instances/$ID response with status code %u\n",
89 : (unsigned int) response_code);
90 0 : switch (response_code)
91 : {
92 0 : case MHD_HTTP_NO_CONTENT:
93 0 : break;
94 0 : default:
95 : /* unexpected response code */
96 0 : hr.ec = TALER_JSON_get_error_code (json);
97 0 : hr.hint = TALER_JSON_get_error_hint (json);
98 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
99 : "Unexpected response code %u/%d\n",
100 : (unsigned int) response_code,
101 : (int) hr.ec);
102 0 : break;
103 : }
104 0 : idh->cb (idh->cb_cls,
105 : &hr);
106 0 : TALER_MERCHANT_instance_delete_cancel (idh);
107 0 : }
108 :
109 :
110 : /**
111 : * Delete the private key of an instance of a backend, thereby disabling the
112 : * instance for future requests. Will preserve the other instance data
113 : * (i.e. for taxation).
114 : *
115 : * @param ctx the context
116 : * @param backend_url HTTP base URL for the backend
117 : * @param instance_id which instance should be deleted
118 : * @param purge purge instead of just deleting
119 : * @param instances_cb function to call with the
120 : * backend's return
121 : * @param instances_cb_cls closure for @a config_cb
122 : * @return the instances handle; NULL upon error
123 : */
124 : static struct TALER_MERCHANT_InstanceDeleteHandle *
125 0 : instance_delete (struct GNUNET_CURL_Context *ctx,
126 : const char *backend_url,
127 : const char *instance_id,
128 : bool purge,
129 : TALER_MERCHANT_InstanceDeleteCallback cb,
130 : void *cb_cls)
131 : {
132 : struct TALER_MERCHANT_InstanceDeleteHandle *idh;
133 :
134 0 : idh = GNUNET_new (struct TALER_MERCHANT_InstanceDeleteHandle);
135 0 : idh->ctx = ctx;
136 0 : idh->cb = cb;
137 0 : idh->cb_cls = cb_cls;
138 : {
139 : char *path;
140 :
141 0 : GNUNET_asprintf (&path,
142 : "private/instances/%s",
143 : instance_id);
144 0 : if (purge)
145 0 : idh->url = TALER_url_join (backend_url,
146 : path,
147 : "purge",
148 : "yes",
149 : NULL);
150 : else
151 0 : idh->url = TALER_url_join (backend_url,
152 : path,
153 : NULL);
154 0 : GNUNET_free (path);
155 : }
156 0 : if (NULL == idh->url)
157 : {
158 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
159 : "Could not construct request URL.\n");
160 0 : GNUNET_free (idh);
161 0 : return NULL;
162 : }
163 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
164 : "Requesting URL '%s'\n",
165 : idh->url);
166 : {
167 : CURL *eh;
168 :
169 0 : eh = curl_easy_init ();
170 0 : GNUNET_assert (CURLE_OK ==
171 : curl_easy_setopt (eh,
172 : CURLOPT_URL,
173 : idh->url));
174 0 : GNUNET_assert (CURLE_OK ==
175 : curl_easy_setopt (eh,
176 : CURLOPT_CUSTOMREQUEST,
177 : MHD_HTTP_METHOD_DELETE));
178 0 : idh->job = GNUNET_CURL_job_add (ctx,
179 : eh,
180 : &handle_delete_instance_finished,
181 : idh);
182 : }
183 0 : return idh;
184 : }
185 :
186 :
187 : /**
188 : * Delete the private key of an instance of a backend, thereby disabling the
189 : * instance for future requests. Will preserve the other instance data
190 : * (i.e. for taxation).
191 : *
192 : * @param ctx the context
193 : * @param backend_url HTTP base URL for the backend
194 : * @param instance_id which instance should be deleted
195 : * @param instances_cb function to call with the
196 : * backend's return
197 : * @param instances_cb_cls closure for @a config_cb
198 : * @return the instances handle; NULL upon error
199 : */
200 : struct TALER_MERCHANT_InstanceDeleteHandle *
201 0 : TALER_MERCHANT_instance_delete (struct GNUNET_CURL_Context *ctx,
202 : const char *backend_url,
203 : const char *instance_id,
204 : TALER_MERCHANT_InstanceDeleteCallback cb,
205 : void *cb_cls)
206 : {
207 0 : return instance_delete (ctx,
208 : backend_url,
209 : instance_id,
210 : false,
211 : cb,
212 : cb_cls);
213 : }
214 :
215 :
216 : /**
217 : * Purge all data associated with an instance. Use with
218 : * extreme caution.
219 : *
220 : * @param ctx the context
221 : * @param backend_url HTTP base URL for the backend
222 : * @param instance_id which instance should be deleted
223 : * @param instances_cb function to call with the
224 : * backend's return
225 : * @param instances_cb_cls closure for @a config_cb
226 : * @return the instances handle; NULL upon error
227 : */
228 : struct TALER_MERCHANT_InstanceDeleteHandle *
229 0 : TALER_MERCHANT_instance_purge (struct GNUNET_CURL_Context *ctx,
230 : const char *backend_url,
231 : const char *instance_id,
232 : TALER_MERCHANT_InstanceDeleteCallback cb,
233 : void *cb_cls)
234 : {
235 0 : return instance_delete (ctx,
236 : backend_url,
237 : instance_id,
238 : true,
239 : cb,
240 : cb_cls);
241 : }
242 :
243 :
244 : /**
245 : * Cancel DELETE /instance/$ID request. Must not be called by clients after
246 : * the callback was invoked.
247 : *
248 : * @param idh request to cancel.
249 : */
250 : void
251 0 : TALER_MERCHANT_instance_delete_cancel (
252 : struct TALER_MERCHANT_InstanceDeleteHandle *idh)
253 : {
254 0 : if (NULL != idh->job)
255 0 : GNUNET_CURL_job_cancel (idh->job);
256 0 : GNUNET_free (idh->url);
257 0 : GNUNET_free (idh);
258 0 : }
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