507 lines
12 KiB
C
507 lines
12 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014-2021 Taler Systems SA
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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, 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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json_t *
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TALER_JSON_from_amount (const struct TALER_Amount *amount)
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{
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char *amount_str = TALER_amount_to_string (amount);
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GNUNET_assert (NULL != amount_str);
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{
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json_t *j = json_string (amount_str);
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GNUNET_free (amount_str);
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return j;
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}
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}
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json_t *
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TALER_JSON_from_amount_nbo (const struct TALER_AmountNBO *amount)
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{
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struct TALER_Amount a;
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TALER_amount_ntoh (&a,
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amount);
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return TALER_JSON_from_amount (&a);
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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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(void) cls;
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if (! json_is_string (root))
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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 (GNUNET_OK !=
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TALER_string_to_amount (json_string_value (root),
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r_amount))
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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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return GNUNET_OK;
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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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/**
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* Parse given JSON object to Amount in NBO.
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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_nbo (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_AmountNBO *r_amount = spec->ptr;
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(void) cls;
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if (! json_is_string (root))
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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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if (GNUNET_OK !=
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TALER_string_to_amount_nbo (json_string_value (root),
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r_amount))
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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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return GNUNET_OK;
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}
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_amount_nbo (const char *name,
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struct TALER_AmountNBO *r_amount)
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{
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struct GNUNET_JSON_Specification ret = {
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.parser = &parse_amount_nbo,
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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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/**
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* Parse given JSON object to *rounded* absolute time.
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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_abs_time (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 GNUNET_TIME_Absolute *abs = spec->ptr;
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json_t *json_t_ms;
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unsigned long long int tval;
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if (! json_is_object (root))
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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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json_t_ms = json_object_get (root, "t_ms");
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if (json_is_integer (json_t_ms))
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{
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tval = json_integer_value (json_t_ms);
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/* Time is in milliseconds in JSON, but in microseconds in GNUNET_TIME_Absolute */
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abs->abs_value_us = tval * 1000LL;
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if ((abs->abs_value_us) / 1000LL != tval)
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{
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/* Integer overflow */
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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if (GNUNET_OK !=
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GNUNET_TIME_round_abs (abs))
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{
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/* time not rounded */
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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return GNUNET_OK;
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}
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if (json_is_string (json_t_ms))
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{
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const char *val;
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val = json_string_value (json_t_ms);
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if ((0 == strcasecmp (val, "never")))
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{
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*abs = GNUNET_TIME_UNIT_FOREVER_ABS;
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return GNUNET_OK;
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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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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_absolute_time (const char *name,
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struct GNUNET_TIME_Absolute *r_time)
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{
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struct GNUNET_JSON_Specification ret = {
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.parser = &parse_abs_time,
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.cleaner = NULL,
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.cls = NULL,
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.field = name,
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.ptr = r_time,
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.ptr_size = sizeof(struct GNUNET_TIME_Absolute),
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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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/**
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* Parse given JSON object to absolute time.
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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_abs_time_nbo (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 GNUNET_TIME_AbsoluteNBO *abs = spec->ptr;
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struct GNUNET_TIME_Absolute a;
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struct GNUNET_JSON_Specification ispec;
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ispec = *spec;
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ispec.parser = &parse_abs_time;
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ispec.ptr = &a;
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if (GNUNET_OK !=
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parse_abs_time (NULL,
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root,
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&ispec))
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return GNUNET_SYSERR;
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*abs = GNUNET_TIME_absolute_hton (a);
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return GNUNET_OK;
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}
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_absolute_time_nbo (const char *name,
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struct GNUNET_TIME_AbsoluteNBO *r_time)
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{
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struct GNUNET_JSON_Specification ret = {
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.parser = &parse_abs_time_nbo,
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.cleaner = NULL,
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.cls = NULL,
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.field = name,
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.ptr = r_time,
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.ptr_size = sizeof(struct GNUNET_TIME_AbsoluteNBO),
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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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/**
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* Parse given JSON object to relative time.
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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_rel_time (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 GNUNET_TIME_Relative *rel = spec->ptr;
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json_t *json_d_ms;
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unsigned long long int tval;
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if (! json_is_object (root))
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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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json_d_ms = json_object_get (root, "d_ms");
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if (json_is_integer (json_d_ms))
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{
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tval = json_integer_value (json_d_ms);
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/* Time is in milliseconds in JSON, but in microseconds in GNUNET_TIME_Absolute */
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rel->rel_value_us = tval * 1000LL;
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if ((rel->rel_value_us) / 1000LL != tval)
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{
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/* Integer overflow */
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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if (GNUNET_OK !=
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GNUNET_TIME_round_rel (rel))
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{
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/* time not rounded */
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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return GNUNET_OK;
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}
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if (json_is_string (json_d_ms))
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{
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const char *val;
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val = json_string_value (json_d_ms);
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if ((0 == strcasecmp (val, "forever")))
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{
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*rel = GNUNET_TIME_UNIT_FOREVER_REL;
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return GNUNET_OK;
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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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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_relative_time (const char *name,
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struct GNUNET_TIME_Relative *r_time)
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{
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struct GNUNET_JSON_Specification ret = {
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.parser = &parse_rel_time,
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.cleaner = NULL,
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.cls = NULL,
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.field = name,
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.ptr = r_time,
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.ptr_size = sizeof(struct GNUNET_TIME_Relative),
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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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struct GNUNET_JSON_Specification
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TALER_JSON_spec_denomination_public_key (const char *field,
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struct TALER_DenominationPublicKey *pk)
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{
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return GNUNET_JSON_spec_rsa_public_key (field,
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&pk->rsa_public_key);
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}
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_denomination_signature (const char *field,
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struct TALER_DenominationSignature *sig)
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{
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return GNUNET_JSON_spec_rsa_signature (field,
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&sig->rsa_signature);
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}
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/**
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* Closure for #parse_i18n_string.
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*/
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struct I18nContext
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{
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/**
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* Language pattern to match.
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*/
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const char *lp;
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/**
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* Name of the field to match.
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*/
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const char *field;
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};
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/**
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* Parse given JSON object to internationalized string.
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*
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* @param cls closure, our `struct I18nContext *`
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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_i18n_string (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 I18nContext *ctx = cls;
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json_t *i18n;
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json_t *val;
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{
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char *i18nf;
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GNUNET_asprintf (&i18nf,
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"%s_i18n",
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ctx->field);
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i18n = json_object_get (root,
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i18nf);
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GNUNET_free (i18nf);
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}
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val = json_object_get (root,
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ctx->field);
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if (NULL != i18n)
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{
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double best = 0.0;
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json_t *pos;
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const char *lang;
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json_object_foreach (i18n, lang, pos)
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{
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double score;
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score = TALER_language_matches (ctx->lp,
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lang);
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if (score > best)
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{
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best = score;
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val = pos;
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}
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}
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}
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{
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const char *str;
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str = json_string_value (val);
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if (NULL == str)
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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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*(const char **) spec->ptr = str;
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}
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return GNUNET_OK;
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}
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/**
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* Function called to clean up data from earlier parsing.
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*
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* @param cls closure
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* @param spec our specification entry with data to clean.
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*/
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static void
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i18n_cleaner (void *cls,
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struct GNUNET_JSON_Specification *spec)
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{
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struct I18nContext *ctx = cls;
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GNUNET_free (ctx);
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}
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_i18n_string (const char *name,
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const char *language_pattern,
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const char **strptr)
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{
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struct I18nContext *ctx = GNUNET_new (struct I18nContext);
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struct GNUNET_JSON_Specification ret = {
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.parser = &parse_i18n_string,
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.cleaner = &i18n_cleaner,
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.cls = ctx,
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.field = NULL, /* we want the main object */
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.ptr = strptr,
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.ptr_size = 0,
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.size_ptr = NULL
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};
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ctx->lp = language_pattern;
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ctx->field = name;
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*strptr = NULL;
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return ret;
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}
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struct GNUNET_JSON_Specification
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TALER_JSON_spec_i18n_str (const char *name,
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const char **strptr)
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{
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return TALER_JSON_spec_i18n_string (name,
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getenv ("LANG"),
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strptr);
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}
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/* end of json/json_helper.c */
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