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 merchant_api_delete_instance.c
19 : * @brief Implementation of the DELETE /instance/$ID request of the merchant's HTTP API
20 : * @author Christian Grothoff
21 : */
22 : #include "platform.h"
23 : #include <curl/curl.h>
24 : #include <jansson.h>
25 : #include <microhttpd.h> /* just for HTTP status codes */
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include "taler_merchant_service.h"
29 : #include "merchant_api_curl_defaults.h"
30 : #include <taler/taler_json_lib.h>
31 : #include <taler/taler_signatures.h>
32 :
33 :
34 : /**
35 : * Handle for a DELETE /instances/$ID operation.
36 : */
37 : struct TALER_MERCHANT_InstanceDeleteHandle
38 : {
39 : /**
40 : * The url for this request.
41 : */
42 : char *url;
43 :
44 : /**
45 : * Handle for the request.
46 : */
47 : struct GNUNET_CURL_Job *job;
48 :
49 : /**
50 : * Function to call with the result.
51 : */
52 : TALER_MERCHANT_InstanceDeleteCallback cb;
53 :
54 : /**
55 : * Closure for @a cb.
56 : */
57 : void *cb_cls;
58 :
59 : /**
60 : * Reference to the execution context.
61 : */
62 : struct GNUNET_CURL_Context *ctx;
63 :
64 : };
65 :
66 :
67 : /**
68 : * Function called when we're done processing the
69 : * HTTP GET /instances/$ID request.
70 : *
71 : * @param cls the `struct TALER_MERCHANT_InstanceDeleteHandle`
72 : * @param response_code HTTP response code, 0 on error
73 : * @param response response body, NULL if not in JSON
74 : */
75 : static void
76 0 : handle_delete_instance_finished (void *cls,
77 : long response_code,
78 : const void *response)
79 : {
80 0 : struct TALER_MERCHANT_InstanceDeleteHandle *idh = cls;
81 0 : const json_t *json = response;
82 0 : struct TALER_MERCHANT_HttpResponse hr = {
83 0 : .http_status = (unsigned int) response_code,
84 : .reply = json
85 : };
86 :
87 0 : idh->job = NULL;
88 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
89 : "Got /instances/$ID response with status code %u\n",
90 : (unsigned int) response_code);
91 0 : switch (response_code)
92 : {
93 0 : case MHD_HTTP_NO_CONTENT:
94 0 : break;
95 0 : case MHD_HTTP_UNAUTHORIZED:
96 0 : hr.ec = TALER_JSON_get_error_code (json);
97 0 : hr.hint = TALER_JSON_get_error_hint (json);
98 : /* Nothing really to verify, merchant says we need to authenticate. */
99 0 : break;
100 0 : case MHD_HTTP_NOT_FOUND:
101 0 : break;
102 0 : default:
103 : /* unexpected response code */
104 0 : hr.ec = TALER_JSON_get_error_code (json);
105 0 : hr.hint = TALER_JSON_get_error_hint (json);
106 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
107 : "Unexpected response code %u/%d for DELETE /instance/ID\n",
108 : (unsigned int) response_code,
109 : (int) hr.ec);
110 0 : break;
111 : }
112 0 : idh->cb (idh->cb_cls,
113 : &hr);
114 0 : TALER_MERCHANT_instance_delete_cancel (idh);
115 0 : }
116 :
117 :
118 : /**
119 : * Delete the private key of an instance of a backend, thereby disabling the
120 : * instance for future requests. Will preserve the other instance data
121 : * (i.e. for taxation).
122 : *
123 : * @param ctx the context
124 : * @param backend_url HTTP base URL for the backend
125 : * @param instance_id which instance should be deleted
126 : * @param purge purge instead of just deleting
127 : * @param cb function to call with the
128 : * backend's return
129 : * @param cb_cls closure for @a config_cb
130 : * @return the instances handle; NULL upon error
131 : */
132 : static struct TALER_MERCHANT_InstanceDeleteHandle *
133 0 : instance_delete (struct GNUNET_CURL_Context *ctx,
134 : const char *backend_url,
135 : const char *instance_id,
136 : bool purge,
137 : TALER_MERCHANT_InstanceDeleteCallback cb,
138 : void *cb_cls)
139 : {
140 : struct TALER_MERCHANT_InstanceDeleteHandle *idh;
141 :
142 0 : idh = GNUNET_new (struct TALER_MERCHANT_InstanceDeleteHandle);
143 0 : idh->ctx = ctx;
144 0 : idh->cb = cb;
145 0 : idh->cb_cls = cb_cls;
146 0 : if (NULL != instance_id)
147 : {
148 : char *path;
149 :
150 0 : GNUNET_asprintf (&path,
151 : "management/instances/%s",
152 : instance_id);
153 0 : idh->url = TALER_url_join (backend_url,
154 : path,
155 : "purge",
156 : (purge) ? "yes" : NULL,
157 : NULL);
158 0 : GNUNET_free (path);
159 : }
160 : else
161 : {
162 : /* backend_url is already identifying the instance */
163 0 : idh->url = TALER_url_join (backend_url,
164 : "private",
165 : "purge",
166 : (purge) ? "yes" : NULL,
167 : NULL);
168 : }
169 0 : if (NULL == idh->url)
170 : {
171 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
172 : "Could not construct request URL.\n");
173 0 : GNUNET_free (idh);
174 0 : return NULL;
175 : }
176 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
177 : "Requesting URL '%s'\n",
178 : idh->url);
179 : {
180 : CURL *eh;
181 :
182 0 : eh = TALER_MERCHANT_curl_easy_get_ (idh->url);
183 0 : GNUNET_assert (CURLE_OK ==
184 : curl_easy_setopt (eh,
185 : CURLOPT_CUSTOMREQUEST,
186 : MHD_HTTP_METHOD_DELETE));
187 0 : idh->job = GNUNET_CURL_job_add (ctx,
188 : eh,
189 : &handle_delete_instance_finished,
190 : idh);
191 : }
192 0 : return idh;
193 : }
194 :
195 :
196 : struct TALER_MERCHANT_InstanceDeleteHandle *
197 0 : TALER_MERCHANT_instance_delete (struct GNUNET_CURL_Context *ctx,
198 : const char *backend_url,
199 : const char *instance_id,
200 : TALER_MERCHANT_InstanceDeleteCallback cb,
201 : void *cb_cls)
202 : {
203 0 : return instance_delete (ctx,
204 : backend_url,
205 : instance_id,
206 : false,
207 : cb,
208 : cb_cls);
209 : }
210 :
211 :
212 : struct TALER_MERCHANT_InstanceDeleteHandle *
213 0 : TALER_MERCHANT_instance_purge (struct GNUNET_CURL_Context *ctx,
214 : const char *backend_url,
215 : const char *instance_id,
216 : TALER_MERCHANT_InstanceDeleteCallback cb,
217 : void *cb_cls)
218 : {
219 0 : return instance_delete (ctx,
220 : backend_url,
221 : instance_id,
222 : true,
223 : cb,
224 : cb_cls);
225 : }
226 :
227 :
228 : void
229 0 : TALER_MERCHANT_instance_delete_cancel (
230 : struct TALER_MERCHANT_InstanceDeleteHandle *idh)
231 : {
232 0 : if (NULL != idh->job)
233 0 : GNUNET_CURL_job_cancel (idh->job);
234 0 : GNUNET_free (idh->url);
235 0 : GNUNET_free (idh);
236 0 : }
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