aboutsummaryrefslogtreecommitdiff
path: root/src/include/taler_auditor_service.h
blob: 79b131a0fca506fac7eb81fb7d154b3e3b8082bb (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
/*
  This file is part of TALER
  Copyright (C) 2014-2018 Taler Systems SA

  TALER is free software; you can redistribute it and/or modify it under the
  terms of the GNU Affero General Public License as published by the Free Software
  Foundation; either version 3, 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 Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License along with
  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
*/
/**
 * @file include/taler_auditor_service.h
 * @brief C interface of libtalerauditor, a C library to use auditor's HTTP API
 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
 * @author Christian Grothoff
 */
#ifndef _TALER_AUDITOR_SERVICE_H
#define _TALER_AUDITOR_SERVICE_H

#include <jansson.h>
#include "taler_util.h"
#include "taler_error_codes.h"
#include <gnunet/gnunet_curl_lib.h>


/* *********************  /version *********************** */

/**
 * @brief Information we get from the auditor about auditors.
 */
struct TALER_AUDITOR_VersionInformation
{
  /**
   * Public key of the auditing institution.  Wallets and merchants
   * are expected to be configured with a set of public keys of
   * auditors that they deem acceptable.  These public keys are
   * the roots of the Taler PKI.
   */
  struct TALER_AuditorPublicKeyP auditor_pub;

  /**
   * Supported Taler protocol version by the auditor.
   * String in the format current:revision:age using the
   * semantics of GNU libtool.  See
   * https://www.gnu.org/software/libtool/manual/html_node/Versioning.html#Versioning
   */
  char *version;

};


/**
 * How compatible are the protocol version of the auditor and this
 * client?  The bits (1,2,4) can be used to test if the auditor's
 * version is incompatible, older or newer respectively.
 */
enum TALER_AUDITOR_VersionCompatibility
{

  /**
   * The auditor runs exactly the same protocol version.
   */
  TALER_AUDITOR_VC_MATCH = 0,

  /**
   * The auditor is too old or too new to be compatible with this
   * implementation (bit)
   */
  TALER_AUDITOR_VC_INCOMPATIBLE = 1,

  /**
   * The auditor is older than this implementation (bit)
   */
  TALER_AUDITOR_VC_OLDER = 2,

  /**
   * The auditor is too old to be compatible with
   * this implementation.
   */
  TALER_AUDITOR_VC_INCOMPATIBLE_OUTDATED
  = TALER_AUDITOR_VC_INCOMPATIBLE
  | TALER_AUDITOR_VC_OLDER,

  /**
   * The auditor is more recent than this implementation (bit).
   */
  TALER_AUDITOR_VC_NEWER = 4,

  /**
   * The auditor is too recent for this implementation.
   */
  TALER_AUDITOR_VC_INCOMPATIBLE_NEWER
  = TALER_AUDITOR_VC_INCOMPATIBLE
  | TALER_AUDITOR_VC_NEWER,

  /**
   * We could not even parse the version data.
   */
  TALER_AUDITOR_VC_PROTOCOL_ERROR = 8

};


/**
 * Function called with information about the auditor.
 *
 * @param cls closure
 * @param vi basic information about the auditor
 * @param compat protocol compatibility information
 */
typedef void
(*TALER_AUDITOR_VersionCallback) (void *cls,
                                  const struct TALER_AUDITOR_VersionInformation *vi,
                                  enum TALER_AUDITOR_VersionCompatibility compat);


/**
 * @brief Handle to the auditor.  This is where we interact with
 * a particular auditor and keep the per-auditor information.
 */
struct TALER_AUDITOR_Handle;


/**
 * Initialise a connection to the auditor. Will connect to the
 * auditor and obtain information about the auditor's master public
 * key and the auditor's auditor.  The respective information will
 * be passed to the @a version_cb once available, and all future
 * interactions with the auditor will be checked to be signed
 * (where appropriate) by the respective master key.
 *
 * @param ctx the context
 * @param url HTTP base URL for the auditor
 * @param version_cb function to call with the auditor's version information
 * @param version_cb_cls closure for @a version_cb
 * @return the auditor handle; NULL upon error
 */
struct TALER_AUDITOR_Handle *
TALER_AUDITOR_connect (struct GNUNET_CURL_Context *ctx,
		       const char *url,
		       TALER_AUDITOR_VersionCallback version_cb,
		       void *version_cb_cls);


/**
 * Disconnect from the auditor.
 *
 * @param auditor the auditor handle
 */
void
TALER_AUDITOR_disconnect (struct TALER_AUDITOR_Handle *auditor);


/**
 * @brief A DepositConfirmation Handle
 */
struct TALER_AUDITOR_DepositConfirmationHandle;


/**
 * Signature of functions called with the result from our call to the
 * auditor's /deposit-confirmation handler.
 *
 * @param cls closure
 * @param http_status HTTP status code, 200 on success
 * @param ec taler protocol error status code, 0 on success
 * @param json raw json response
 */
typedef void
(*TALER_AUDITOR_DepositConfirmationResultCallback)(void *cls,
                                                   unsigned int http_status,
                                                   enum TALER_ErrorCode ec,
                                                   const json_t *json);


/**
 * Cancel a deposit-confirmation permission request.  This function cannot be used
 * on a request handle if a response is already served for it.
 *
 * @param deposit-confirmation the deposit-confirmation permission request handle
 */
void
TALER_AUDITOR_deposit_confirmation_cancel (struct TALER_AUDITOR_DepositConfirmationHandle *deposit_confirmation);

#endif  /* _TALER_AUDITOR_SERVICE_H */