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/*
This file is part of TALER
Copyright (C) 2021, 2022 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_kyc-wallet.c
* @brief Handle request for wallet for KYC check.
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_json_lib.h>
#include <jansson.h>
#include <microhttpd.h>
#include <pthread.h>
#include "taler_json_lib.h"
#include "taler_mhd_lib.h"
#include "taler_kyclogic_lib.h"
#include "taler-exchange-httpd_kyc-wallet.h"
#include "taler-exchange-httpd_responses.h"
/**
* Context for the request.
*/
struct KycRequestContext
{
/**
* Public key of the reserve/wallet this is about.
*/
struct TALER_PaytoHashP h_payto;
/**
* Row with the legitimization requirement.
*/
uint64_t legi_row;
/**
* Balance threshold crossed by the wallet.
*/
struct TALER_Amount balance;
/**
* Name of the required check.
*/
const char *required;
};
/**
* Function called to iterate over KYC-relevant
* transaction amounts for a particular time range.
* Returns the wallet balance.
*
* @param cls closure, a `struct KycRequestContext`
* @param limit maximum time-range for which events
* should be fetched (timestamp in the past)
* @param cb function to call on each event found,
* events must be returned in reverse chronological
* order
* @param cb_cls closure for @a cb
*/
static void
balance_iterator (void *cls,
struct GNUNET_TIME_Absolute limit,
TALER_EXCHANGEDB_KycAmountCallback cb,
void *cb_cls)
{
struct KycRequestContext *krc = cls;
(void) limit;
cb (cb_cls,
&krc->balance,
GNUNET_TIME_absolute_get ());
}
/**
* Function implementing database transaction to check wallet's KYC status.
* Runs the transaction logic; IF it returns a non-error code, the transaction
* logic MUST NOT queue a MHD response. IF it returns an hard error, the
* transaction logic MUST queue a MHD response and set @a mhd_ret. IF it
* returns the soft error code, the function MAY be called again to retry and
* MUST not queue a MHD response.
*
* @param cls closure with a `struct KycRequestContext *`
* @param connection MHD request which triggered the transaction
* @param[out] mhd_ret set to MHD response status for @a connection,
* if transaction failed (!)
* @return transaction status
*/
static enum GNUNET_DB_QueryStatus
wallet_kyc_check (void *cls,
struct MHD_Connection *connection,
MHD_RESULT *mhd_ret)
{
struct KycRequestContext *krc = cls;
enum GNUNET_DB_QueryStatus qs;
krc->required = TALER_KYCLOGIC_kyc_test_required (
TALER_KYCLOGIC_KYC_TRIGGER_WALLET_BALANCE,
&krc->h_payto,
TEH_plugin->select_satisfied_kyc_processes,
TEH_plugin->cls,
&balance_iterator,
krc);
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"KYC check required at %s is `%s'\n",
TALER_amount2s (&krc->balance),
krc->required);
if (NULL == krc->required)
return GNUNET_DB_STATUS_SUCCESS_NO_RESULTS;
qs = TEH_plugin->insert_kyc_requirement_for_account (TEH_plugin->cls,
krc->required,
&krc->h_payto,
&krc->legi_row);
if (qs < 0)
{
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
return qs;
GNUNET_break (0);
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_FETCH_FAILED,
"insert_kyc_requirement_for_account");
return qs;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"KYC requirement inserted for wallet %s (%llu, %d)\n",
TALER_B2S (&krc->h_payto),
(unsigned long long) krc->legi_row,
qs);
return qs;
}
MHD_RESULT
TEH_handler_kyc_wallet (
struct TEH_RequestContext *rc,
const json_t *root,
const char *const args[])
{
struct TALER_ReserveSignatureP reserve_sig;
struct KycRequestContext krc;
struct TALER_ReservePublicKeyP reserve_pub;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("reserve_sig",
&reserve_sig),
GNUNET_JSON_spec_fixed_auto ("reserve_pub",
&reserve_pub),
// FIXME: add balance threshold crossed to the request
// to spec and client API!
TALER_JSON_spec_amount ("balance",
TEH_currency,
&krc.balance),
GNUNET_JSON_spec_end ()
};
MHD_RESULT res;
enum GNUNET_GenericReturnValue ret;
(void) args;
ret = TALER_MHD_parse_json_data (rc->connection,
root,
spec);
if (GNUNET_SYSERR == ret)
return MHD_NO; /* hard failure */
if (GNUNET_NO == ret)
return MHD_YES; /* failure */
TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_EDDSA]++;
// FIXME: add balance threshold crossed to
// what the wallet signs over!
if (GNUNET_OK !=
TALER_wallet_account_setup_verify (&reserve_pub,
&reserve_sig))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (
rc->connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_EXCHANGE_KYC_WALLET_SIGNATURE_INVALID,
NULL);
}
{
char *payto_uri;
payto_uri = TALER_reserve_make_payto (TEH_base_url,
&reserve_pub);
TALER_payto_hash (payto_uri,
&krc.h_payto);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"h_payto of wallet %s is %s\n",
payto_uri,
TALER_B2S (&krc.h_payto));
GNUNET_free (payto_uri);
}
ret = TEH_DB_run_transaction (rc->connection,
"check wallet kyc",
TEH_MT_REQUEST_OTHER,
&res,
&wallet_kyc_check,
&krc);
if (GNUNET_SYSERR == ret)
return res;
if (NULL == krc.required)
{
/* KYC not required or already satisfied */
return TALER_MHD_reply_static (
rc->connection,
MHD_HTTP_NO_CONTENT,
NULL,
NULL,
0);
}
return TALER_MHD_REPLY_JSON_PACK (
rc->connection,
MHD_HTTP_OK,
GNUNET_JSON_pack_uint64 ("payment_target_uuid",
krc.legi_row));
}
/* end of taler-exchange-httpd_kyc-wallet.c */
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