GNUnet  0.11.x
json.c
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1 /*
2  This file is part of GNUnet
3  Copyright (C) 2014-2017, 2021, 2022 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
27 #include "platform.h"
28 #include "gnunet_json_lib.h"
29 
30 
32 GNUNET_JSON_parse (const json_t *root,
33  struct GNUNET_JSON_Specification *spec,
34  const char **error_json_name,
35  unsigned int *error_line)
36 {
37  if (NULL == root)
38  return GNUNET_SYSERR;
39  for (unsigned int i = 0; NULL != spec[i].parser; i++)
40  {
41  json_t *pos;
42 
43  if (NULL == spec[i].field)
44  pos = (json_t *) root;
45  else
46  pos = json_object_get (root,
47  spec[i].field);
48  if ( ( (NULL == pos) ||
49  (json_is_null (pos) ) ) &&
50  (spec[i].is_optional) )
51  {
52  if (NULL != spec[i].missing)
53  *spec[i].missing = true;
54  continue;
55  }
56  if ( (NULL == pos) ||
57  (GNUNET_OK !=
58  spec[i].parser (spec[i].cls,
59  pos,
60  &spec[i])) )
61  {
62  if (NULL != error_json_name)
63  *error_json_name = spec[i].field;
64  else
66  "Parsing failed for field `%s:%u`\n",
67  spec[i].field,
68  i);
69  if (NULL != error_line)
70  *error_line = i;
72  return GNUNET_SYSERR;
73  }
74  if (NULL != spec[i].missing)
75  *spec[i].missing = false;
76  }
77  return GNUNET_OK; /* all OK! */
78 }
79 
80 
83  bool *missing)
84 {
85  struct GNUNET_JSON_Specification ret = spec;
86 
87  ret.is_optional = true;
88  ret.missing = missing;
89  return ret;
90 }
91 
92 
93 void
95 {
96  for (unsigned int i = 0; NULL != spec[i].parser; i++)
97  if (NULL != spec[i].cleaner)
98  spec[i].cleaner (spec[i].cls,
99  &spec[i]);
100 }
101 
102 
115 static enum GNUNET_GenericReturnValue
117  void *scls,
118  const char *option,
119  const char *value)
120 {
121  json_t **json = scls;
122  json_error_t error;
123 
124  *json = json_loads (value,
125  JSON_REJECT_DUPLICATES,
126  &error);
127  if (NULL == *json)
128  {
129  fprintf (stderr,
130  _ ("Failed to parse JSON in option `%s': %s (%s)\n"),
131  option,
132  error.text,
133  error.source);
134  return GNUNET_SYSERR;
135  }
136  return GNUNET_OK;
137 }
138 
139 
142  const char *name,
143  const char *argumentHelp,
144  const char *description,
145  json_t **json)
146 {
147  struct GNUNET_GETOPT_CommandLineOption clo = {
148  .shortName = shortName,
149  .name = name,
150  .argumentHelp = argumentHelp,
151  .description = description,
152  .require_argument = 1,
153  .processor = &set_json,
154  .scls = (void *) json
155  };
156 
157  return clo;
158 }
159 
160 
161 /* end of json.c */
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
static char * value
Value of the record to add/remove.
static struct GNUNET_DNSSTUB_Context * ctx
Context for DNS resolution.
#define GNUNET_log(kind,...)
GNUNET_GenericReturnValue
Named constants for return values.
Definition: gnunet_common.h:92
@ GNUNET_OK
Definition: gnunet_common.h:95
@ GNUNET_SYSERR
Definition: gnunet_common.h:93
functions to parse JSON objects into GNUnet objects
@ GNUNET_ERROR_TYPE_WARNING
static enum GNUNET_GenericReturnValue set_json(struct GNUNET_GETOPT_CommandLineProcessorContext *ctx, void *scls, const char *option, const char *value)
Set an option with a JSON value from the command line.
Definition: json.c:116
void GNUNET_JSON_parse_free(struct GNUNET_JSON_Specification *spec)
Frees all elements allocated during a GNUNET_JSON_parse() operation.
Definition: json.c:94
struct GNUNET_JSON_Specification GNUNET_JSON_spec_mark_optional(struct GNUNET_JSON_Specification spec, bool *missing)
Set the "optional" flag for a parser specification entry.
Definition: json.c:82
struct GNUNET_GETOPT_CommandLineOption GNUNET_JSON_getopt(char shortName, const char *name, const char *argumentHelp, const char *description, json_t **json)
Allow user to specify a JSON input value.
Definition: json.c:141
enum GNUNET_GenericReturnValue GNUNET_JSON_parse(const json_t *root, struct GNUNET_JSON_Specification *spec, const char **error_json_name, unsigned int *error_line)
Navigate and parse data in a JSON tree.
Definition: json.c:32
#define _(String)
GNU gettext support macro.
Definition: platform.h:177
const char * name
Definition of a command line option.
const char * description
Help text for the option (description)
const char * argumentHelp
Name of the argument for the user in help text.
const char shortName
Short name of the option.
General context for command line processors.
Entry in parser specification for GNUNET_JSON_parse().
GNUNET_JSON_Cleaner cleaner
Function for how to clean up this type of entry.
bool * missing
Pointer to set to true if this argument is indeed missing.
const char * field
Name of the field to parse, use NULL to get the JSON of the main object instead of the JSON of an ind...
void * cls
Closure for parser and cleaner.
GNUNET_JSON_Parser parser
Function for how to parse this type of entry.