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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[])
{
// TODO: should we have something similar to struct WithdrawContext?
// as far as I can tell this isn't necessary because we don't have
// other functions that the context should be passed to
// struct CsRContext csrc;
struct TALER_WithdrawNonce nonce;
struct TALER_DenominationHash denom_pub_hash;
struct TALER_DenominationCsPublicR r_pub;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed ("nonce",
&nonce,
sizeof (struct TALER_WithdrawNonce)),
GNUNET_JSON_spec_fixed ("denom_pub_hash",
&denom_pub_hash,
sizeof (struct TALER_DenominationHash)),
GNUNET_JSON_spec_end ()
};
enum TALER_ErrorCode ec;
struct TEH_DenominationKey *dk;
(void) args;
memset (&nonce,
0,
sizeof (nonce));
memset (&denom_pub_hash,
0,
sizeof (denom_pub_hash));
memset (&r_pub,
0,
sizeof (r_pub));
// parse input
{
enum GNUNET_GenericReturnValue res;
res = TALER_MHD_parse_json_data (rc->connection,
root,
spec);
GNUNET_JSON_parse_free (spec);
if (GNUNET_OK != res)
return (GNUNET_SYSERR == res) ? MHD_NO : MHD_YES;
}
// check denomination referenced by denom_pub_hash
{
MHD_RESULT mret;
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);
return mret;
}
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);
}
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,
GNUNET_TIME_timestamp_get (),
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,
GNUNET_TIME_timestamp_get (),
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,
GNUNET_TIME_timestamp_get (),
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_unknown_denom_pub_hash (
rc->connection,
&denom_pub_hash);
}
}
// derive r_pub
ec = TALER_EC_NONE;
r_pub = TEH_keys_denomination_cs_r_pub (&denom_pub_hash,
&nonce,
&ec);
if (TALER_EC_NONE != ec)
{
GNUNET_break (0);
return TALER_MHD_reply_with_ec (rc->connection,
ec,
NULL);
}
// send response
{
MHD_RESULT ret;
ret = TALER_MHD_REPLY_JSON_PACK (
rc->connection,
MHD_HTTP_OK,
GNUNET_JSON_pack_data_varsize ("r_pub_0",
&r_pub.r_pub[0],
sizeof(struct GNUNET_CRYPTO_CsRPublic)),
GNUNET_JSON_pack_data_varsize ("r_pub_1",
&r_pub.r_pub[1],
sizeof(struct GNUNET_CRYPTO_CsRPublic)));
return ret;
}
}
/* end of taler-exchange-httpd_csr.c */
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