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/*
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 Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General
Public License along with TALER; see the file COPYING. If not,
see <http://www.gnu.org/licenses/>
*/
/**
* @file taler-exchange-httpd_csr.c
* @brief Handle /csr requests
* @author Lucien Heuzeveldt
* @author Gian Demarmles
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <jansson.h>
#include "taler_json_lib.h"
#include "taler_mhd_lib.h"
#include "taler-exchange-httpd_csr.h"
#include "taler-exchange-httpd_responses.h"
#include "taler-exchange-httpd_keys.h"
MHD_RESULT
TEH_handler_csr (struct TEH_RequestContext *rc,
const json_t *root,
const char *const args[])
{
unsigned int csr_requests_num;
json_t *csr_requests;
json_t *csr_response_ewvs;
json_t *csr_response;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_json ("nks",
&csr_requests),
GNUNET_JSON_spec_end ()
};
enum TALER_ErrorCode ec;
struct TEH_DenominationKey *dk;
(void) args;
// parse input
{
enum GNUNET_GenericReturnValue res;
res = TALER_MHD_parse_json_data (rc->connection,
root,
spec);
if (GNUNET_OK != res)
return (GNUNET_SYSERR == res) ? MHD_NO : MHD_YES;
}
csr_requests_num = json_array_size (csr_requests);
if (TALER_MAX_FRESH_COINS <= csr_requests_num)
{
GNUNET_JSON_parse_free (spec);
return TALER_MHD_reply_with_error (
rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_EXCHANGE_GENERIC_NEW_DENOMS_ARRAY_SIZE_EXCESSIVE,
NULL);
}
struct TALER_CsNonce nonces[GNUNET_NZL (csr_requests_num)];
struct TALER_DenominationHash denom_pub_hashes[GNUNET_NZL (csr_requests_num)];
for (unsigned int i = 0; i < csr_requests_num; i++)
{
struct TALER_CsNonce *nonce = &nonces[i];
struct TALER_DenominationHash *denom_pub_hash = &denom_pub_hashes[i];
struct GNUNET_JSON_Specification csr_spec[] = {
GNUNET_JSON_spec_fixed ("nonce",
nonce,
sizeof (struct TALER_CsNonce)),
GNUNET_JSON_spec_fixed ("denom_pub_hash",
denom_pub_hash,
sizeof (struct TALER_DenominationHash)),
GNUNET_JSON_spec_end ()
};
enum GNUNET_GenericReturnValue res;
res = TALER_MHD_parse_json_array (rc->connection,
csr_requests,
csr_spec,
i,
-1);
if (GNUNET_OK != res)
{
GNUNET_JSON_parse_free (spec);
return (GNUNET_NO == res) ? MHD_YES : MHD_NO;
}
}
GNUNET_JSON_parse_free (spec);
struct TALER_ExchangeWithdrawValues ewvs[GNUNET_NZL (csr_requests_num)];
for (unsigned int i = 0; i < csr_requests_num; i++)
{
const struct TALER_CsNonce *nonce = &nonces[i];
const struct TALER_DenominationHash *denom_pub_hash = &denom_pub_hashes[i];
struct TALER_DenominationCSPublicRPairP *r_pub
= &ewvs[i].details.cs_values;
ewvs[i].cipher = TALER_DENOMINATION_CS;
// check denomination referenced by denom_pub_hash
{
struct TEH_KeyStateHandle *ksh;
ksh = TEH_keys_get_state ();
if (NULL == ksh)
{
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_GENERIC_KEYS_MISSING,
NULL);
}
dk = TEH_keys_denomination_by_hash2 (ksh,
denom_pub_hash,
NULL,
NULL);
if (NULL == dk)
{
return TEH_RESPONSE_reply_unknown_denom_pub_hash (
rc->connection,
&denom_pub_hash[i]);
}
if (GNUNET_TIME_absolute_is_past (dk->meta.expire_withdraw.abs_time))
{
/* This denomination is past the expiration time for withdraws/refreshes*/
return TEH_RESPONSE_reply_expired_denom_pub_hash (
rc->connection,
denom_pub_hash,
TALER_EC_EXCHANGE_GENERIC_DENOMINATION_EXPIRED,
"CSR");
}
if (GNUNET_TIME_absolute_is_future (dk->meta.start.abs_time))
{
/* This denomination is not yet valid, no need to check
for idempotency! */
return TEH_RESPONSE_reply_expired_denom_pub_hash (
rc->connection,
denom_pub_hash,
TALER_EC_EXCHANGE_GENERIC_DENOMINATION_VALIDITY_IN_FUTURE,
"CSR");
}
if (dk->recoup_possible)
{
/* This denomination has been revoked */
return TEH_RESPONSE_reply_expired_denom_pub_hash (
rc->connection,
denom_pub_hash,
TALER_EC_EXCHANGE_GENERIC_DENOMINATION_REVOKED,
"CSR");
}
if (TALER_DENOMINATION_CS != dk->denom_pub.cipher)
{
// denomination is valid but not CS
return TEH_RESPONSE_reply_invalid_denom_cipher_for_operation (
rc->connection,
denom_pub_hash);
}
}
// derive r_pub
// FIXME: bundle all requests into one derivation request (TEH_keys_..., crypto helper, security module)
ec = TEH_keys_denomination_cs_r_pub (denom_pub_hash,
nonce,
r_pub);
if (TALER_EC_NONE != ec)
{
GNUNET_break (0);
return TALER_MHD_reply_with_ec (rc->connection,
ec,
NULL);
}
}
// send response
csr_response_ewvs = json_array ();
for (unsigned int i = 0; i < csr_requests_num; i++)
{
json_t *csr_obj;
csr_obj = GNUNET_JSON_PACK (
TALER_JSON_pack_exchange_withdraw_values ("ewv",
&ewvs[i]));
GNUNET_assert (NULL != csr_obj);
GNUNET_assert (0 ==
json_array_append_new (csr_response_ewvs,
csr_obj));
}
csr_response = GNUNET_JSON_PACK (
GNUNET_JSON_pack_array_steal ("ewvs",
csr_response_ewvs));
GNUNET_assert (NULL != csr_response);
return TALER_MHD_reply_json_steal (rc->connection,
csr_response,
MHD_HTTP_OK);
}
/* end of taler-exchange-httpd_csr.c */
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