summaryrefslogtreecommitdiff
path: root/src/json/json_helper.c
blob: 746b39e497195b123c66995ecd861138181321e9 (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
/*
  This file is part of TALER
  Copyright (C) 2014-2020 Taler Systems SA

  TALER is free software; you can redistribute it and/or modify it under the
  terms of the GNU 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 General Public License for more details.

  You should have received a copy of the GNU General Public License along with
  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
*/
/**
 * @file json/json_helper.c
 * @brief helper functions to generate specifications to parse
 *        Taler-specific JSON objects with libgnunetjson
 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
 * @author Christian Grothoff
 */
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include "taler_util.h"
#include "taler_json_lib.h"


/**
 * Convert a TALER amount to a JSON object.
 *
 * @param amount the amount
 * @return a json object describing the amount
 */
json_t *
TALER_JSON_from_amount (const struct TALER_Amount *amount)
{
  char *amount_str = TALER_amount_to_string (amount);

  GNUNET_assert (NULL != amount_str);
  {
    json_t *j = json_string (amount_str);

    GNUNET_free (amount_str);
    return j;
  }
}


/**
 * Convert a TALER amount to a JSON object.
 *
 * @param amount the amount
 * @return a json object describing the amount
 */
json_t *
TALER_JSON_from_amount_nbo (const struct TALER_AmountNBO *amount)
{
  struct TALER_Amount a;

  TALER_amount_ntoh (&a,
                     amount);
  return TALER_JSON_from_amount (&a);
}


/**
 * Parse given JSON object to Amount
 *
 * @param cls closure, NULL
 * @param root the json object representing data
 * @param[out] spec where to write the data
 * @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
 */
static int
parse_amount (void *cls,
              json_t *root,
              struct GNUNET_JSON_Specification *spec)
{
  struct TALER_Amount *r_amount = spec->ptr;

  (void) cls;
  if (! json_is_string (root))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  if (GNUNET_OK !=
      TALER_string_to_amount (json_string_value (root),
                              r_amount))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}


/**
 * Provide specification to parse given JSON object to an amount.
 *
 * @param name name of the amount field in the JSON
 * @param[out] r_amount where the amount has to be written
 */
struct GNUNET_JSON_Specification
TALER_JSON_spec_amount (const char *name,
                        struct TALER_Amount *r_amount)
{
  struct GNUNET_JSON_Specification ret = {
    .parser = &parse_amount,
    .cleaner = NULL,
    .cls = NULL,
    .field = name,
    .ptr = r_amount,
    .ptr_size = 0,
    .size_ptr = NULL
  };
  return ret;
}


/**
 * Parse given JSON object to Amount in NBO.
 *
 * @param cls closure, NULL
 * @param root the json object representing data
 * @param[out] spec where to write the data
 * @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
 */
static int
parse_amount_nbo (void *cls,
                  json_t *root,
                  struct GNUNET_JSON_Specification *spec)
{
  struct TALER_AmountNBO *r_amount = spec->ptr;

  (void) cls;
  if (! json_is_string (root))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  if (GNUNET_OK !=
      TALER_string_to_amount_nbo (json_string_value (root),
                                  r_amount))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}


/**
 * Provide specification to parse given JSON object to an amount.
 *
 * @param name name of the amount field in the JSON
 * @param[out] r_amount where the amount has to be written
 */
struct GNUNET_JSON_Specification
TALER_JSON_spec_amount_nbo (const char *name,
                            struct TALER_AmountNBO *r_amount)
{
  struct GNUNET_JSON_Specification ret = {
    .parser = &parse_amount_nbo,
    .cleaner = NULL,
    .cls = NULL,
    .field = name,
    .ptr = r_amount,
    .ptr_size = 0,
    .size_ptr = NULL
  };
  return ret;
}


/**
 * Generate line in parser specification for denomination public key.
 *
 * @param field name of the field
 * @param[out] pk key to initialize
 * @return corresponding field spec
 */
struct GNUNET_JSON_Specification
TALER_JSON_spec_denomination_public_key (const char *field,
                                         struct TALER_DenominationPublicKey *pk)
{
  return GNUNET_JSON_spec_rsa_public_key (field,
                                          &pk->rsa_public_key);
}


/**
 * Generate line in parser specification for denomination signature.
 *
 * @param field name of the field
 * @param sig the signature to initialize
 * @return corresponding field spec
 */
struct GNUNET_JSON_Specification
TALER_JSON_spec_denomination_signature (const char *field,
                                        struct TALER_DenominationSignature *sig)
{
  return GNUNET_JSON_spec_rsa_signature (field,
                                         &sig->rsa_signature);
}


/* end of json/json_helper.c */