/*
This file is part of TALER
Copyright (C) 2014-2021 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
*/
/**
* @file json/json_helper.c
* @brief helper functions to generate specifications to parse
* Taler-specific JSON objects with libgnunetjson
* @author Sree Harsha Totakura
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include "taler_util.h"
#include "taler_json_lib.h"
/**
* Convert string value to numeric cipher value.
*
* @param cipher_s input string
* @return numeric cipher value
*/
static enum TALER_DenominationCipher
string_to_cipher (const char *cipher_s)
{
if ((0 == strcasecmp (cipher_s,
"RSA")) ||
(0 == strcasecmp (cipher_s,
"RSA+age_restricted")))
return TALER_DENOMINATION_RSA;
if ((0 == strcasecmp (cipher_s,
"CS")) ||
(0 == strcasecmp (cipher_s,
"CS+age_restricted")))
return TALER_DENOMINATION_CS;
return TALER_DENOMINATION_INVALID;
}
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;
}
}
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, expected currency, or 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 enum GNUNET_GenericReturnValue
parse_amount (void *cls,
json_t *root,
struct GNUNET_JSON_Specification *spec)
{
const char *currency = cls;
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;
}
if ( (NULL != currency) &&
(0 !=
strcasecmp (currency,
r_amount->currency)) )
{
GNUNET_break_op (0);
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Expected currency `%s', but amount used currency `%s' in field `%s'\n",
currency,
r_amount->currency,
spec->field);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_amount (const char *name,
const char *currency,
struct TALER_Amount *r_amount)
{
struct GNUNET_JSON_Specification ret = {
.parser = &parse_amount,
.cleaner = NULL,
.cls = (void *) currency,
.field = name,
.ptr = r_amount,
.ptr_size = 0,
.size_ptr = NULL
};
GNUNET_assert (NULL != currency);
return ret;
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_amount_any (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 enum GNUNET_GenericReturnValue
parse_amount_nbo (void *cls,
json_t *root,
struct GNUNET_JSON_Specification *spec)
{
const char *currency = cls;
struct TALER_AmountNBO *r_amount = spec->ptr;
const char *sv;
(void) cls;
if (! json_is_string (root))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
sv = json_string_value (root);
if (GNUNET_OK !=
TALER_string_to_amount_nbo (sv,
r_amount))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"`%s' is not a valid amount\n",
sv);
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
if ( (NULL != currency) &&
(0 !=
strcasecmp (currency,
r_amount->currency)) )
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_amount_nbo (const char *name,
const char *currency,
struct TALER_AmountNBO *r_amount)
{
struct GNUNET_JSON_Specification ret = {
.parser = &parse_amount_nbo,
.cleaner = NULL,
.cls = (void *) currency,
.field = name,
.ptr = r_amount,
.ptr_size = 0,
.size_ptr = NULL
};
GNUNET_assert (NULL != currency);
return ret;
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_amount_any_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;
}
static enum GNUNET_GenericReturnValue
parse_denomination_group (void *cls,
json_t *root,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_DenominationGroup *group = spec->ptr;
const char *cipher;
bool age_mask_missing = false;
bool has_age_restricted_suffix = false;
struct GNUNET_JSON_Specification gspec[] = {
GNUNET_JSON_spec_string ("cipher",
&cipher),
TALER_JSON_spec_amount ("value",
group->currency,
&group->value),
TALER_JSON_SPEC_DENOM_FEES ("fee",
group->currency,
&group->fees),
GNUNET_JSON_spec_mark_optional (
GNUNET_JSON_spec_uint32 ("age_mask",
&group->age_mask.bits),
&age_mask_missing),
GNUNET_JSON_spec_fixed_auto ("hash",
&group->hash),
GNUNET_JSON_spec_end ()
};
const char *emsg;
unsigned int eline;
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
gspec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
group->cipher = string_to_cipher (cipher);
if (TALER_DENOMINATION_INVALID == group->cipher)
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
/* age_mask and suffix must be consistent */
has_age_restricted_suffix =
(NULL != strstr (cipher, "+age_restricted"));
if (has_age_restricted_suffix && age_mask_missing)
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
if (age_mask_missing)
group->age_mask.bits = 0;
return GNUNET_OK;
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_denomination_group (const char *name,
struct TALER_DenominationGroup *group)
{
struct GNUNET_JSON_Specification ret = {
.parser = &parse_denomination_group,
.cleaner = NULL,
.field = name,
.ptr = group,
.ptr_size = sizeof(*group),
.size_ptr = NULL,
};
return ret;
}
/**
* Parse given JSON object to an encrypted contract.
*
* @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 enum GNUNET_GenericReturnValue
parse_econtract (void *cls,
json_t *root,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_EncryptedContract *econtract = spec->ptr;
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_varsize ("econtract",
&econtract->econtract,
&econtract->econtract_size),
GNUNET_JSON_spec_fixed_auto ("econtract_sig",
&econtract->econtract_sig),
GNUNET_JSON_spec_fixed_auto ("contract_pub",
&econtract->contract_pub),
GNUNET_JSON_spec_end ()
};
const char *emsg;
unsigned int eline;
(void) cls;
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Cleanup data left from parsing encrypted contract.
*
* @param cls closure, NULL
* @param[out] spec where to free the data
*/
static void
clean_econtract (void *cls,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_EncryptedContract *econtract = spec->ptr;
(void) cls;
GNUNET_free (econtract->econtract);
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_econtract (const char *name,
struct TALER_EncryptedContract *econtract)
{
struct GNUNET_JSON_Specification ret = {
.parser = &parse_econtract,
.cleaner = &clean_econtract,
.cls = NULL,
.field = name,
.ptr = econtract,
.ptr_size = 0,
.size_ptr = NULL
};
return ret;
}
/**
* Parse given JSON object to denomination public key.
*
* @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 enum GNUNET_GenericReturnValue
parse_denom_pub (void *cls,
json_t *root,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_DenominationPublicKey *denom_pub = spec->ptr;
const char *cipher;
bool age_mask_missing = false;
struct GNUNET_JSON_Specification dspec[] = {
GNUNET_JSON_spec_string ("cipher",
&cipher),
GNUNET_JSON_spec_mark_optional (
GNUNET_JSON_spec_uint32 ("age_mask",
&denom_pub->age_mask.bits),
&age_mask_missing),
GNUNET_JSON_spec_end ()
};
const char *emsg;
unsigned int eline;
(void) cls;
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
dspec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
if (age_mask_missing)
denom_pub->age_mask.bits = 0;
denom_pub->cipher = string_to_cipher (cipher);
switch (denom_pub->cipher)
{
case TALER_DENOMINATION_RSA:
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_rsa_public_key (
"rsa_public_key",
&denom_pub->details.rsa_public_key),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
case TALER_DENOMINATION_CS:
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_fixed ("cs_public_key",
&denom_pub->details.cs_public_key,
sizeof (denom_pub->details.cs_public_key)),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
default:
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
}
/**
* Cleanup data left from parsing denomination public key.
*
* @param cls closure, NULL
* @param[out] spec where to free the data
*/
static void
clean_denom_pub (void *cls,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_DenominationPublicKey *denom_pub = spec->ptr;
(void) cls;
TALER_denom_pub_free (denom_pub);
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_denom_pub (const char *field,
struct TALER_DenominationPublicKey *pk)
{
struct GNUNET_JSON_Specification ret = {
.parser = &parse_denom_pub,
.cleaner = &clean_denom_pub,
.field = field,
.ptr = pk
};
pk->cipher = TALER_DENOMINATION_INVALID;
return ret;
}
/**
* Parse given JSON object partially into a denomination public key.
*
* Depending on the cipher in cls, it parses the corresponding public key type.
*
* @param cls closure, enum TALER_DenominationCipher
* @param cipher cipher to parse for
* @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 enum GNUNET_GenericReturnValue
parse_denom_pub_cipher (void *cls,
json_t *root,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_DenominationPublicKey *denom_pub = spec->ptr;
enum TALER_DenominationCipher cipher = (enum TALER_DenominationCipher) cls;
const char *emsg;
unsigned int eline;
switch (cipher)
{
case TALER_DENOMINATION_RSA:
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_rsa_public_key (
"rsa_pub",
&denom_pub->details.rsa_public_key),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
case TALER_DENOMINATION_CS:
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_fixed ("cs_pub",
&denom_pub->details.cs_public_key,
sizeof (denom_pub->details.cs_public_key)),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
default:
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_denom_pub_cipher (const char *field,
enum TALER_DenominationCipher cipher,
struct TALER_DenominationPublicKey *pk)
{
struct GNUNET_JSON_Specification ret = {
.parser = &parse_denom_pub_cipher,
.cleaner = &clean_denom_pub,
.field = field,
.cls = (void *) cipher,
.ptr = pk
};
return ret;
}
/**
* Parse given JSON object to denomination signature.
*
* @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 enum GNUNET_GenericReturnValue
parse_denom_sig (void *cls,
json_t *root,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_DenominationSignature *denom_sig = spec->ptr;
const char *cipher;
struct GNUNET_JSON_Specification dspec[] = {
GNUNET_JSON_spec_string ("cipher",
&cipher),
GNUNET_JSON_spec_end ()
};
const char *emsg;
unsigned int eline;
(void) cls;
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
dspec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
denom_sig->cipher = string_to_cipher (cipher);
switch (denom_sig->cipher)
{
case TALER_DENOMINATION_RSA:
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_rsa_signature (
"rsa_signature",
&denom_sig->details.rsa_signature),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
case TALER_DENOMINATION_CS:
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_fixed_auto ("cs_signature_r",
&denom_sig->details.cs_signature.r_point),
GNUNET_JSON_spec_fixed_auto ("cs_signature_s",
&denom_sig->details.cs_signature.s_scalar),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
default:
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
}
/**
* Cleanup data left from parsing denomination public key.
*
* @param cls closure, NULL
* @param[out] spec where to free the data
*/
static void
clean_denom_sig (void *cls,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_DenominationSignature *denom_sig = spec->ptr;
(void) cls;
TALER_denom_sig_free (denom_sig);
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_denom_sig (const char *field,
struct TALER_DenominationSignature *sig)
{
struct GNUNET_JSON_Specification ret = {
.parser = &parse_denom_sig,
.cleaner = &clean_denom_sig,
.field = field,
.ptr = sig
};
sig->cipher = TALER_DENOMINATION_INVALID;
return ret;
}
/**
* Parse given JSON object to blinded denomination signature.
*
* @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 enum GNUNET_GenericReturnValue
parse_blinded_denom_sig (void *cls,
json_t *root,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_BlindedDenominationSignature *denom_sig = spec->ptr;
const char *cipher;
struct GNUNET_JSON_Specification dspec[] = {
GNUNET_JSON_spec_string ("cipher",
&cipher),
GNUNET_JSON_spec_end ()
};
const char *emsg;
unsigned int eline;
(void) cls;
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
dspec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
denom_sig->cipher = string_to_cipher (cipher);
switch (denom_sig->cipher)
{
case TALER_DENOMINATION_RSA:
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_rsa_signature (
"blinded_rsa_signature",
&denom_sig->details.blinded_rsa_signature),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
case TALER_DENOMINATION_CS:
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_uint32 ("b",
&denom_sig->details.blinded_cs_answer.b),
GNUNET_JSON_spec_fixed_auto ("s",
&denom_sig->details.blinded_cs_answer.
s_scalar),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
break;
default:
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
}
/**
* Cleanup data left from parsing denomination public key.
*
* @param cls closure, NULL
* @param[out] spec where to free the data
*/
static void
clean_blinded_denom_sig (void *cls,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_BlindedDenominationSignature *denom_sig = spec->ptr;
(void) cls;
TALER_blinded_denom_sig_free (denom_sig);
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_blinded_denom_sig (
const char *field,
struct TALER_BlindedDenominationSignature *sig)
{
struct GNUNET_JSON_Specification ret = {
.parser = &parse_blinded_denom_sig,
.cleaner = &clean_blinded_denom_sig,
.field = field,
.ptr = sig
};
sig->cipher = TALER_DENOMINATION_INVALID;
return ret;
}
/**
* Parse given JSON object to blinded planchet.
*
* @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 enum GNUNET_GenericReturnValue
parse_blinded_planchet (void *cls,
json_t *root,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_BlindedPlanchet *blinded_planchet = spec->ptr;
const char *cipher;
struct GNUNET_JSON_Specification dspec[] = {
GNUNET_JSON_spec_string ("cipher",
&cipher),
GNUNET_JSON_spec_end ()
};
const char *emsg;
unsigned int eline;
(void) cls;
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
dspec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
blinded_planchet->cipher = string_to_cipher (cipher);
switch (blinded_planchet->cipher)
{
case TALER_DENOMINATION_RSA:
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_varsize (
"rsa_blinded_planchet",
&blinded_planchet->details.rsa_blinded_planchet.blinded_msg,
&blinded_planchet->details.rsa_blinded_planchet.blinded_msg_size),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
case TALER_DENOMINATION_CS:
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_fixed_auto (
"cs_nonce",
&blinded_planchet->details.cs_blinded_planchet.nonce),
GNUNET_JSON_spec_fixed_auto (
"cs_blinded_c0",
&blinded_planchet->details.cs_blinded_planchet.c[0]),
GNUNET_JSON_spec_fixed_auto (
"cs_blinded_c1",
&blinded_planchet->details.cs_blinded_planchet.c[1]),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
break;
default:
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
}
/**
* Cleanup data left from parsing blinded planchet.
*
* @param cls closure, NULL
* @param[out] spec where to free the data
*/
static void
clean_blinded_planchet (void *cls,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_BlindedPlanchet *blinded_planchet = spec->ptr;
(void) cls;
TALER_blinded_planchet_free (blinded_planchet);
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_blinded_planchet (const char *field,
struct TALER_BlindedPlanchet *blinded_planchet)
{
struct GNUNET_JSON_Specification ret = {
.parser = &parse_blinded_planchet,
.cleaner = &clean_blinded_planchet,
.field = field,
.ptr = blinded_planchet
};
blinded_planchet->cipher = TALER_DENOMINATION_INVALID;
return ret;
}
/**
* Parse given JSON object to exchange withdraw values (/csr).
*
* @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 enum GNUNET_GenericReturnValue
parse_exchange_withdraw_values (void *cls,
json_t *root,
struct GNUNET_JSON_Specification *spec)
{
struct TALER_ExchangeWithdrawValues *ewv = spec->ptr;
const char *cipher;
struct GNUNET_JSON_Specification dspec[] = {
GNUNET_JSON_spec_string ("cipher",
&cipher),
GNUNET_JSON_spec_end ()
};
const char *emsg;
unsigned int eline;
(void) cls;
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
dspec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
ewv->cipher = string_to_cipher (cipher);
switch (ewv->cipher)
{
case TALER_DENOMINATION_RSA:
return GNUNET_OK;
case TALER_DENOMINATION_CS:
{
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_fixed (
"r_pub_0",
&ewv->details.cs_values.r_pub[0],
sizeof (struct GNUNET_CRYPTO_CsRPublic)),
GNUNET_JSON_spec_fixed (
"r_pub_1",
&ewv->details.cs_values.r_pub[1],
sizeof (struct GNUNET_CRYPTO_CsRPublic)),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (root,
ispec,
&emsg,
&eline))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
default:
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_exchange_withdraw_values (
const char *field,
struct TALER_ExchangeWithdrawValues *ewv)
{
struct GNUNET_JSON_Specification ret = {
.parser = &parse_exchange_withdraw_values,
.field = field,
.ptr = ewv
};
ewv->cipher = TALER_DENOMINATION_INVALID;
return ret;
}
/**
* Closure for #parse_i18n_string.
*/
struct I18nContext
{
/**
* Language pattern to match.
*/
char *lp;
/**
* Name of the field to match.
*/
const char *field;
};
/**
* Parse given JSON object to internationalized string.
*
* @param cls closure, our `struct I18nContext *`
* @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 enum GNUNET_GenericReturnValue
parse_i18n_string (void *cls,
json_t *root,
struct GNUNET_JSON_Specification *spec)
{
struct I18nContext *ctx = cls;
json_t *i18n;
json_t *val;
{
char *i18nf;
GNUNET_asprintf (&i18nf,
"%s_i18n",
ctx->field);
i18n = json_object_get (root,
i18nf);
GNUNET_free (i18nf);
}
val = json_object_get (root,
ctx->field);
if ( (NULL != i18n) &&
(NULL != ctx->lp) )
{
double best = 0.0;
json_t *pos;
const char *lang;
json_object_foreach (i18n, lang, pos)
{
double score;
score = TALER_language_matches (ctx->lp,
lang);
if (score > best)
{
best = score;
val = pos;
}
}
}
{
const char *str;
str = json_string_value (val);
if (NULL == str)
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
*(const char **) spec->ptr = str;
}
return GNUNET_OK;
}
/**
* Function called to clean up data from earlier parsing.
*
* @param cls closure
* @param spec our specification entry with data to clean.
*/
static void
i18n_cleaner (void *cls,
struct GNUNET_JSON_Specification *spec)
{
struct I18nContext *ctx = cls;
(void) spec;
GNUNET_free (ctx->lp);
GNUNET_free (ctx);
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_i18n_string (const char *name,
const char *language_pattern,
const char **strptr)
{
struct I18nContext *ctx = GNUNET_new (struct I18nContext);
struct GNUNET_JSON_Specification ret = {
.parser = &parse_i18n_string,
.cleaner = &i18n_cleaner,
.cls = ctx,
.field = NULL, /* we want the main object */
.ptr = strptr,
.ptr_size = 0,
.size_ptr = NULL
};
ctx->lp = (NULL != language_pattern) ? GNUNET_strdup (language_pattern) :
NULL;
ctx->field = name;
*strptr = NULL;
return ret;
}
struct GNUNET_JSON_Specification
TALER_JSON_spec_i18n_str (const char *name,
const char **strptr)
{
const char *lang = getenv ("LANG");
char *dot;
char *l;
struct GNUNET_JSON_Specification ret;
if (NULL != lang)
{
dot = strchr (lang,
'.');
if (NULL == dot)
l = GNUNET_strdup (lang);
else
l = GNUNET_strndup (lang,
dot - lang);
}
else
{
l = NULL;
}
ret = TALER_JSON_spec_i18n_string (name,
l,
strptr);
GNUNET_free (l);
return ret;
}
/* end of json/json_helper.c */