147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014, 2015, 2016 GNUnet e.V.
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file json/json_helper.c
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* @brief helper functions to generate specifications to parse
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* Taler-specific JSON objects with libgnunetjson
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* @author Sree Harsha Totakura <sreeharsha@totakura.in>
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <gnunet/gnunet_util_lib.h>
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#include "taler_util.h"
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#include "taler_json_lib.h"
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/**
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* Convert a TALER amount to a JSON object.
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*
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* @param amount the amount
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* @return a json object describing the amount
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*/
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json_t *
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TALER_JSON_from_amount (const struct TALER_Amount *amount)
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{
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json_t *j;
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if ( (amount->value != (uint64_t) ((json_int_t) amount->value)) ||
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(0 > ((json_int_t) amount->value)) )
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{
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/* Theoretically, json_int_t can be a 32-bit "long", or we might
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have a 64-bit value which converted to a 63-bit signed long
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long causes problems here. So we check. Note that depending
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on the platform, the compiler may be able to statically tell
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that at least the first check is always false. */
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GNUNET_break (0);
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return NULL;
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}
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j = json_pack ("{s:s, s:I, s:I}",
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"currency", amount->currency,
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"value", (json_int_t) amount->value,
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"fraction", (json_int_t) amount->fraction);
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GNUNET_assert (NULL != j);
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return j;
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}
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/**
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* Parse given JSON object to Amount
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*
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* @param cls closure, NULL
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* @param root the json object representing data
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* @param[out] spec where to write the data
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* @return #GNUNET_OK upon successful parsing; #GNUNET_SYSERR upon error
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*/
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static int
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parse_amount (void *cls,
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json_t *root,
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struct GNUNET_JSON_Specification *spec)
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{
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struct TALER_Amount *r_amount = spec->ptr;
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json_int_t value;
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json_int_t fraction;
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const char *currency;
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memset (r_amount,
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0,
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sizeof (struct TALER_Amount));
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if (0 != json_unpack (root,
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"{s:I, s:I, s:s}",
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"value", &value,
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"fraction", &fraction,
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"currency", ¤cy))
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{
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char *json_enc;
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if (NULL == (json_enc = json_dumps (root,
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JSON_COMPACT | JSON_ENCODE_ANY)))
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{
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GNUNET_break (0);
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return GNUNET_SYSERR;
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}
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GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
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"Malformed JSON amount: %s\n",
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json_enc);
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free (json_enc);
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return GNUNET_SYSERR;
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}
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if ( (value < 0) ||
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(fraction < 0) ||
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(value > UINT64_MAX) ||
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(fraction > UINT32_MAX) )
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{
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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if (strlen (currency) >= TALER_CURRENCY_LEN)
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{
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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r_amount->value = (uint64_t) value;
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r_amount->fraction = (uint32_t) fraction;
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strcpy (r_amount->currency, currency);
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(void) TALER_amount_normalize (r_amount);
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return GNUNET_OK;
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}
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/**
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* Provide specification to parse given JSON object to an amount.
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*
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* @param name name of the amount field in the JSON
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* @param[out] r_amount where the amount has to be written
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*/
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_amount (const char *name,
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struct TALER_Amount *r_amount)
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{
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struct GNUNET_JSON_Specification ret = {
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.parser = &parse_amount,
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.cleaner = NULL,
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.cls = NULL,
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.field = name,
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.ptr = r_amount,
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.ptr_size = 0,
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.size_ptr = NULL
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};
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return ret;
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}
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/* end of json/json_helper.c */
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