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/*
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 */
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