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/*
This file is part of TALER
(C) 2014 Christian Grothoff (and other contributing authors)
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, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file util/json.c
* @brief helper functions for JSON processing using libjansson
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include "taler_util.h"
#include "taler_json_lib.h"
/**
* Shorthand for exit jumps.
*/
#define EXITIF(cond) \
do { \
if (cond) { GNUNET_break (0); goto EXITIF_exit; } \
} while (0)
/**
* Print JSON parsing related error information
*/
#define WARN_JSON(error) \
GNUNET_log (GNUNET_ERROR_TYPE_WARNING, \
"JSON parsing failed at %s:%u: %s (%s)", \
__FILE__, __LINE__, error.text, error.source)
/**
* Shorthand for JSON parsing related exit jumps.
*/
#define UNPACK_EXITIF(cond) \
do { \
if (cond) { WARN_JSON(error); goto EXITIF_exit; } \
} while (0)
/**
* 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 (struct TALER_Amount amount)
{
json_t *j;
j = json_pack ("{s: s, s:I, s:I}",
"currency", amount.currency,
"value", (json_int_t) amount.value,
"fraction", (json_int_t) amount.fraction);
GNUNET_assert (NULL != j);
return j;
}
/**
* Convert absolute timestamp to a json string.
*
* @param the time stamp
* @return a json string with the timestamp in @a stamp
*/
json_t *
TALER_JSON_from_abs (struct GNUNET_TIME_Absolute stamp)
{
json_t *j;
char *mystr;
int ret;
ret = GNUNET_asprintf (&mystr, "%llu",
(long long) (stamp.abs_value_us / (1000 * 1000)));
GNUNET_assert (ret > 0);
j = json_string (mystr);
GNUNET_free (mystr);
return j;
}
/**
* Convert a signature (with purpose) to a JSON object representation.
*
* @param purpose purpose of the signature
* @param signature the signature
* @return the JSON reporesentation of the signature with purpose
*/
json_t *
TALER_JSON_from_sig (const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose,
const struct GNUNET_CRYPTO_EddsaSignature *signature)
{
json_t *root;
json_t *el;
root = json_object ();
el = json_integer ((json_int_t) ntohl (purpose->size));
json_object_set_new (root, "size", el);
el = json_integer ((json_int_t) ntohl (purpose->purpose));
json_object_set_new (root, "purpose", el);
el = TALER_JSON_from_data (signature,
sizeof (struct GNUNET_CRYPTO_EddsaSignature));
json_object_set_new (root, "sig", el);
return root;
}
/**
* Convert binary data to a JSON string
* with the base32crockford encoding.
*
* @param data binary data
* @param size size of @a data in bytes
* @return json string that encodes @a data
*/
json_t *
TALER_JSON_from_data (const void *data, size_t size)
{
char *buf;
json_t *json;
buf = GNUNET_STRINGS_data_to_string_alloc (data, size);
json = json_string (buf);
GNUNET_free (buf);
return json;
}
/**
* Parse given JSON object to Amount
*
* @param json the json object representing Amount
* @param r_amount where the amount has to be written
* @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
*/
int
TALER_JSON_to_amount (json_t *json,
struct TALER_Amount *r_amount)
{
char *currency;
json_int_t value;
json_int_t fraction;
json_error_t error;
UNPACK_EXITIF (0 != json_unpack_ex (json, &error, JSON_STRICT,
"{s:s, s:I, s:I}",
"curreny", ¤cy,
"value", &value,
"fraction", &fraction));
EXITIF (3 < strlen (currency));
r_amount->value = (uint32_t) value;
r_amount->fraction = (uint32_t) fraction;
return GNUNET_OK;
EXITIF_exit:
return GNUNET_SYSERR;
}
/**
* Parse given JSON object to Amount
*
* @param json the json object representing Amount
* @param r_amount where the amount has to be written
* @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
*/
int
TALER_JSON_to_abs (json_t *json,
struct GNUNET_TIME_Absolute *abs)
{
const char *str;
unsigned long long abs_value_s;
GNUNET_assert (NULL != abs);
EXITIF (NULL == (str = json_string_value (json)));
EXITIF (1 > sscanf (str, "%llu", &abs_value_s));
abs->abs_value_us = abs_value_s * 1000 * 1000;
return GNUNET_OK;
EXITIF_exit:
return GNUNET_SYSERR;
}
/**
* Parse given JSON object to data
*
* @param json the json object representing data
* @param out the pointer to hold the parsed data.
* @param out_size the size of @a out
* @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
*/
int
TALER_JSON_to_data (json_t *json,
void *out,
size_t out_size)
{
const char *enc;
unsigned int len;
EXITIF (NULL == (enc = json_string_value (json)));
len = strlen (enc);
EXITIF ((((len * 5) / 8) + ((((len * 5) % 8) == 0) ? 0 : 1)) == out_size);
EXITIF (GNUNET_OK != GNUNET_STRINGS_string_to_data (enc, len, out, out_size));
return GNUNET_OK;
EXITIF_exit:
return GNUNET_SYSERR;
}
/* End of util/json.c */
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