summaryrefslogtreecommitdiff
path: root/src/lib/merchant_api_delete_instance.c
blob: 684f2c75a9a1cbf64580cdae47f813c49dca972e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
/*
  This file is part of TALER
  Copyright (C) 2014-2018, 2020 Taler Systems SA

  TALER is free software; you can redistribute it and/or modify it under the
  terms of the GNU Lesser General Public License as published by the Free Software
  Foundation; either version 2.1, or (at your option) any later version.

  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License along with
  TALER; see the file COPYING.LGPL.  If not, see
  <http://www.gnu.org/licenses/>
*/
/**
 * @file merchant_api_delete_instance.c
 * @brief Implementation of the DELETE /instance/$ID request of the merchant's HTTP API
 * @author Christian Grothoff
 */
#include "platform.h"
#include <curl/curl.h>
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP status codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_merchant_service.h"
#include <taler/taler_json_lib.h>
#include <taler/taler_signatures.h>


/**
 * Handle for a DELETE /instances/$ID operation.
 */
struct TALER_MERCHANT_InstanceDeleteHandle
{
  /**
   * The url for this request.
   */
  char *url;

  /**
   * Handle for the request.
   */
  struct GNUNET_CURL_Job *job;

  /**
   * Function to call with the result.
   */
  TALER_MERCHANT_InstanceDeleteCallback cb;

  /**
   * Closure for @a cb.
   */
  void *cb_cls;

  /**
   * Reference to the execution context.
   */
  struct GNUNET_CURL_Context *ctx;

};


/**
 * Function called when we're done processing the
 * HTTP GET /instances/$ID request.
 *
 * @param cls the `struct TALER_MERCHANT_InstanceDeleteHandle`
 * @param response_code HTTP response code, 0 on error
 * @param response response body, NULL if not in JSON
 */
static void
handle_delete_instance_finished (void *cls,
                                 long response_code,
                                 const void *response)
{
  struct TALER_MERCHANT_InstanceDeleteHandle *idh = cls;
  const json_t *json = response;
  struct TALER_MERCHANT_HttpResponse hr = {
    .http_status = (unsigned int) response_code,
    .reply = json
  };

  idh->job = NULL;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Got /instances/$ID response with status code %u\n",
              (unsigned int) response_code);
  switch (response_code)
  {
  case MHD_HTTP_NO_CONTENT:
    break;
  case MHD_HTTP_UNAUTHORIZED:
    hr.ec = TALER_JSON_get_error_code (json);
    hr.hint = TALER_JSON_get_error_hint (json);
    /* Nothing really to verify, merchant says we need to authenticate. */
    break;
  case MHD_HTTP_NOT_FOUND:
    break;
  default:
    /* unexpected response code */
    hr.ec = TALER_JSON_get_error_code (json);
    hr.hint = TALER_JSON_get_error_hint (json);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unexpected response code %u/%d for DELETE /instance/ID\n",
                (unsigned int) response_code,
                (int) hr.ec);
    break;
  }
  idh->cb (idh->cb_cls,
           &hr);
  TALER_MERCHANT_instance_delete_cancel (idh);
}


/**
 * Delete the private key of an instance of a backend, thereby disabling the
 * instance for future requests.  Will preserve the other instance data
 * (i.e. for taxation).
 *
 * @param ctx the context
 * @param backend_url HTTP base URL for the backend
 * @param instance_id which instance should be deleted
 * @param purge purge instead of just deleting
 * @param cb function to call with the
 *        backend's return
 * @param cb_cls closure for @a config_cb
 * @return the instances handle; NULL upon error
 */
static struct TALER_MERCHANT_InstanceDeleteHandle *
instance_delete (struct GNUNET_CURL_Context *ctx,
                 const char *backend_url,
                 const char *instance_id,
                 bool purge,
                 TALER_MERCHANT_InstanceDeleteCallback cb,
                 void *cb_cls)
{
  struct TALER_MERCHANT_InstanceDeleteHandle *idh;

  idh = GNUNET_new (struct TALER_MERCHANT_InstanceDeleteHandle);
  idh->ctx = ctx;
  idh->cb = cb;
  idh->cb_cls = cb_cls;
  if (NULL != instance_id)
  {
    char *path;

    GNUNET_asprintf (&path,
                     "management/instances/%s",
                     instance_id);
    idh->url = TALER_url_join (backend_url,
                               path,
                               "purge",
                               (purge) ? "yes" : NULL,
                               NULL);
    GNUNET_free (path);
  }
  else
  {
    /* backend_url is already identifying the instance */
    idh->url = TALER_url_join (backend_url,
                               "private",
                               "purge",
                               (purge) ? "yes" : NULL,
                               NULL);
  }
  if (NULL == idh->url)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Could not construct request URL.\n");
    GNUNET_free (idh);
    return NULL;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Requesting URL '%s'\n",
              idh->url);
  {
    CURL *eh;

    eh = curl_easy_init ();
    GNUNET_assert (CURLE_OK ==
                   curl_easy_setopt (eh,
                                     CURLOPT_URL,
                                     idh->url));
    GNUNET_assert (CURLE_OK ==
                   curl_easy_setopt (eh,
                                     CURLOPT_CUSTOMREQUEST,
                                     MHD_HTTP_METHOD_DELETE));
    idh->job = GNUNET_CURL_job_add (ctx,
                                    eh,
                                    &handle_delete_instance_finished,
                                    idh);
  }
  return idh;
}


struct TALER_MERCHANT_InstanceDeleteHandle *
TALER_MERCHANT_instance_delete (struct GNUNET_CURL_Context *ctx,
                                const char *backend_url,
                                const char *instance_id,
                                TALER_MERCHANT_InstanceDeleteCallback cb,
                                void *cb_cls)
{
  return instance_delete (ctx,
                          backend_url,
                          instance_id,
                          false,
                          cb,
                          cb_cls);
}


struct TALER_MERCHANT_InstanceDeleteHandle *
TALER_MERCHANT_instance_purge (struct GNUNET_CURL_Context *ctx,
                               const char *backend_url,
                               const char *instance_id,
                               TALER_MERCHANT_InstanceDeleteCallback cb,
                               void *cb_cls)
{
  return instance_delete (ctx,
                          backend_url,
                          instance_id,
                          true,
                          cb,
                          cb_cls);
}


void
TALER_MERCHANT_instance_delete_cancel (
  struct TALER_MERCHANT_InstanceDeleteHandle *idh)
{
  if (NULL != idh->job)
    GNUNET_CURL_job_cancel (idh->job);
  GNUNET_free (idh->url);
  GNUNET_free (idh);
}