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/*
This file is part of TALER
Copyright (C) 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_kyc-check.c
* @brief Handle request for generic 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_signatures.h"
#include "taler-exchange-httpd_keys.h"
#include "taler-exchange-httpd_kyc-wallet.h"
#include "taler-exchange-httpd_responses.h"
/**
* Context for the request.
*/
struct KycCheckContext
{
/**
* UUID being checked.
*/
uint64_t payment_target_uuid;
/**
* Current KYC status.
*/
struct TALER_EXCHANGEDB_KycStatus kyc;
/**
* Hash of the payto:// URI we are confirming to
* have finished the KYC for.
*/
struct TALER_PaytoHash h_payto;
};
/**
* 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 KycCheckContext *`
* @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
kyc_check (void *cls,
struct MHD_Connection *connection,
MHD_RESULT *mhd_ret)
{
struct KycCheckContext *kcc = cls;
enum GNUNET_DB_QueryStatus qs;
qs = TEH_plugin->select_kyc_status (TEH_plugin->cls,
kcc->payment_target_uuid,
&kcc->h_payto,
&kcc->kyc);
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,
"inselect_wallet_status");
return qs;
}
return qs;
}
MHD_RESULT
TEH_handler_kyc_check (
struct TEH_RequestContext *rc,
const char *const args[])
{
unsigned long long payment_target_uuid;
MHD_RESULT res;
enum GNUNET_GenericReturnValue ret;
char dummy;
struct TALER_PaytoHash h_payto;
if (1 !=
sscanf (args[0],
"%llu%c",
&payment_target_uuid,
&dummy))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
"payment_target_uuid");
}
{
const char *ts;
ts = MHD_lookup_connection_value (rc->connection,
MHD_GET_ARGUMENT_KIND,
"timeout_ms");
if (NULL != ts)
{
unsigned long long tms;
if (1 !=
sscanf (ts,
"%llu%c",
&tms,
&dummy))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
"timeout_ms");
}
/* FIXME: write long polling logic ... */
}
}
{
const char *hps;
hps = MHD_lookup_connection_value (rc->connection,
MHD_GET_ARGUMENT_KIND,
"h_payto");
if (NULL == hps)
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MISSING,
"h_payto");
}
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (hps,
strlen (hps),
&h_payto,
sizeof (h_payto)))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
"h_payto");
}
}
if (TEH_KYC_NONE == TEH_kyc_config.mode)
return TALER_MHD_reply_static (
rc->connection,
MHD_HTTP_NO_CONTENT,
NULL,
NULL,
0);
{
struct GNUNET_TIME_Absolute now;
struct KycCheckContext kcc = {
.payment_target_uuid = payment_target_uuid
};
now = GNUNET_TIME_absolute_get ();
(void) GNUNET_TIME_round_abs (&now);
ret = TEH_DB_run_transaction (rc->connection,
"kyc check",
&res,
&kyc_check,
&kcc);
if (GNUNET_SYSERR == ret)
return res;
if (0 !=
GNUNET_memcmp (&kcc.h_payto,
&h_payto))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_UNAUTHORIZED,
TALER_EC_EXCHANGE_KYC_CHECK_AUTHORIZATION_FAILED,
"h_payto");
}
if (! kcc.kyc.ok)
{
char *url;
char *redirect_uri;
char *redirect_uri_encoded;
GNUNET_assert (TEH_KYC_OAUTH2 == TEH_kyc_config.mode);
GNUNET_asprintf (&redirect_uri,
"%s/kyc-proof/%llu",
TEH_base_url,
payment_target_uuid);
redirect_uri_encoded = TALER_urlencode (redirect_uri);
GNUNET_free (redirect_uri);
GNUNET_asprintf (&url,
"%s/login?client_id=%s&redirect_uri=%s",
TEH_kyc_config.details.oauth2.url,
TEH_kyc_config.details.oauth2.client_id,
redirect_uri_encoded);
GNUNET_free (redirect_uri_encoded);
res = TALER_MHD_REPLY_JSON_PACK (
rc->connection,
MHD_HTTP_ACCEPTED,
GNUNET_JSON_pack_string ("kyc_url",
url));
GNUNET_free (url);
return res;
}
{
struct TALER_ExchangePublicKeyP pub;
struct TALER_ExchangeSignatureP sig;
struct TALER_ExchangeAccountSetupSuccessPS as = {
.purpose.purpose = htonl (
TALER_SIGNATURE_EXCHANGE_ACCOUNT_SETUP_SUCCESS),
.purpose.size = htonl (sizeof (as)),
.h_payto = kcc.h_payto,
.timestamp = GNUNET_TIME_absolute_hton (now)
};
enum TALER_ErrorCode ec;
if (TALER_EC_NONE !=
(ec = TEH_keys_exchange_sign (&as,
&pub,
&sig)))
{
return TALER_MHD_reply_with_ec (rc->connection,
ec,
NULL);
}
return TALER_MHD_REPLY_JSON_PACK (
rc->connection,
MHD_HTTP_OK,
GNUNET_JSON_pack_data_auto ("exchange_sig",
&sig),
GNUNET_JSON_pack_data_auto ("exchange_pub",
&pub),
GNUNET_JSON_pack_time_abs ("now",
now));
}
}
}
/* end of taler-exchange-httpd_kyc-check.c */
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