aboutsummaryrefslogtreecommitdiff
path: root/src/bank-lib/bank_api_common.c
blob: ec55db892da15a000a8b70dc12f7e2cbe4e94041 (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
/*
  This file is part of TALER
  Copyright (C) 2015, 2016, 2017 GNUnet e.V.

  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 bank-lib/bank_api_common.c
 * @brief Common functions for the bank API
 * @author Christian Grothoff
 */
#include "platform.h"
#include "bank_api_common.h"


/**
 * Append HTTP key-value pair to curl header list.
 *
 * @param hdr list to append to, can be NULL
 * @param key key to append
 * @param value value to append
 * @return new list, NULL on error
 */
static struct curl_slist *
append (struct curl_slist *hdr,
        const char *key,
        const char *value)
{
  char *str;
  struct curl_slist *ret;

  GNUNET_asprintf (&str,
                   "%s: %s",
                   key,
                   value);
  ret = curl_slist_append (hdr,
                           str);
  GNUNET_free (str);
  if (NULL == ret)
  {
    GNUNET_break (0);
    curl_slist_free_all (hdr);
    return NULL;
  }
  return ret;
}


/**
 * Build authentication header from @a auth.
 *
 * @param auth authentication data to use
 * @return NULL on error, otherwise curl headers to use
 */
struct curl_slist *
TALER_BANK_make_auth_header_ (const struct TALER_BANK_AuthenticationData *auth)
{
  struct curl_slist *authh;

  switch (auth->method)
  {
  case TALER_BANK_AUTH_NONE:
    return NULL;
  case TALER_BANK_AUTH_BASIC:
    authh = append (NULL,
                    "X-Taler-Bank-Username",
                    auth->details.basic.username);
    if (NULL == authh)
      return NULL;
    authh = append (authh,
                    "X-Taler-Bank-Password",
                    auth->details.basic.password);
    return authh;
  }
  return NULL;
}


/**
 * Obtain the URL to use for an API request.
 *
 * @param u base URL of the bank
 * @param path Taler API path (i.e. "/history")
 * @return the full URL to use with cURL
 */
char *
TALER_BANK_path_to_url_ (const char *u,
                         const char *path)
{
  char *url;

  if ( ('/' == path[0]) &&
       (0 < strlen (u)) &&
       ('/' == u[strlen (u) - 1]) )
    path++; /* avoid generating URL with "//" from concat */
  GNUNET_asprintf (&url,
                   "%s%s",
                   u,
                   path);
  return url;
}


/**
 * Parse error code given in @a json.
 *
 * @param json the json to parse
 * @return error code, or #TALER_EC_INVALID if not found
 */
enum TALER_ErrorCode
TALER_BANK_parse_ec_ (const json_t *json)
{
  uint32_t ec;

  struct GNUNET_JSON_Specification spec[] = {
    GNUNET_JSON_spec_uint32 ("ec",
                             &ec),
    GNUNET_JSON_spec_end()
  };

  if (GNUNET_OK !=
      GNUNET_JSON_parse (json,
                         spec,
                         NULL, NULL))
  {
    GNUNET_break_op (0);
    return TALER_EC_INVALID;
  }
  return (enum TALER_ErrorCode) ec;
}


/* end of bank_api_common.c */