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/*
This file is part of TALER
Copyright (C) 2018 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_wire.c
* @brief helper functions to generate or check /wire replies
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include "taler_util.h"
#include "taler_json_lib.h"
/**
* Compute the hash of the given wire details. The resulting
* hash is what is put into the contract.
*
* @param wire_s wire details to hash
* @param[out] hc set to the hash
* @return #GNUNET_OK on success, #GNUNET_SYSERR if @a wire_s is malformed
*/
int
TALER_JSON_merchant_wire_signature_hash (const json_t *wire_s,
struct GNUNET_HashCode *hc)
{
const char *payto_uri;
const char *salt; /* Current merchant backend will always make the salt
a `struct GNUNET_HashCode`, but *we* do not insist
on that. */
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("payto_uri", &payto_uri),
GNUNET_JSON_spec_string ("salt", &salt),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (wire_s,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Validating `%s'\n",
payto_uri);
{
char *err;
err = TALER_payto_validate (payto_uri);
if (NULL != err)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"URI `%s' ill-formed: %s\n",
payto_uri,
err);
GNUNET_free (err);
return GNUNET_SYSERR;
}
}
TALER_merchant_wire_signature_hash (payto_uri,
salt,
hc);
return GNUNET_OK;
}
/**
* Check the signature in @a wire_s. Also performs rudimentary
* checks on the account data *if* supported.
*
* @param wire_s signed wire information of an exchange
* @param master_pub master public key of the exchange
* @return #GNUNET_OK if signature is valid
*/
int
TALER_JSON_exchange_wire_signature_check (
const json_t *wire_s,
const struct TALER_MasterPublicKeyP *master_pub)
{
const char *payto_uri;
struct TALER_MasterSignatureP master_sig;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("payto_uri", &payto_uri),
GNUNET_JSON_spec_fixed_auto ("master_sig", &master_sig),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (wire_s,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
{
char *err;
err = TALER_payto_validate (payto_uri);
if (NULL != err)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"URI `%s' ill-formed: %s\n",
payto_uri,
err);
GNUNET_free (err);
return GNUNET_SYSERR;
}
}
return TALER_exchange_wire_signature_check (payto_uri,
master_pub,
&master_sig);
}
/**
* Create a signed wire statement for the given account.
*
* @param payto_uri account specification
* @param master_priv private key to sign with
* @return NULL if @a payto_uri is malformed
*/
json_t *
TALER_JSON_exchange_wire_signature_make (
const char *payto_uri,
const struct TALER_MasterPrivateKeyP *master_priv)
{
struct TALER_MasterSignatureP master_sig;
char *err;
if (NULL !=
(err = TALER_payto_validate (payto_uri)))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Invalid payto URI `%s': %s\n",
payto_uri,
err);
GNUNET_free (err);
return NULL;
}
TALER_exchange_wire_signature_make (payto_uri,
master_priv,
&master_sig);
return GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("payto_uri",
payto_uri),
GNUNET_JSON_pack_data_auto ("master_sig",
&master_sig));
}
/**
* Obtain the wire method associated with the given
* wire account details. @a wire_s must contain a payto://-URL
* under 'payto_uri'.
*
* @return NULL on error
*/
char *
TALER_JSON_wire_to_payto (const json_t *wire_s)
{
json_t *payto_o;
const char *payto_str;
char *err;
payto_o = json_object_get (wire_s,
"payto_uri");
if ( (NULL == payto_o) ||
(NULL == (payto_str = json_string_value (payto_o))) )
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Malformed wire record encountered: lacks payto://-url\n");
return NULL;
}
if (NULL !=
(err = TALER_payto_validate (payto_str)))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Malformed wire record encountered: payto URI `%s' invalid: %s\n",
payto_str,
err);
GNUNET_free (err);
return NULL;
}
return GNUNET_strdup (payto_str);
}
/**
* Obtain the wire method associated with the given
* wire account details. @a wire_s must contain a payto://-URL
* under 'url'.
*
* @return NULL on error
*/
char *
TALER_JSON_wire_to_method (const json_t *wire_s)
{
json_t *payto_o;
const char *payto_str;
payto_o = json_object_get (wire_s,
"payto_uri");
if ( (NULL == payto_o) ||
(NULL == (payto_str = json_string_value (payto_o))) )
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Fatally malformed wire record encountered: lacks payto://-url\n");
return NULL;
}
return TALER_payto_get_method (payto_str);
}
/* end of json_wire.c */
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