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exchange/src/lib/exchange_api_kyc_check.c

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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 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 lib/exchange_api_kyc_check.c
* @brief Implementation of the /kyc-check request
* @author Christian Grothoff
*/
#include "platform.h"
#include <microhttpd.h> /* just for HTTP check codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_exchange_service.h"
#include "taler_json_lib.h"
#include "exchange_api_handle.h"
#include "taler_signatures.h"
#include "exchange_api_curl_defaults.h"
/**
* @brief A ``/kyc-check`` handle
*/
struct TALER_EXCHANGE_KycCheckHandle
{
/**
* The connection to exchange this request handle will use
*/
struct TALER_EXCHANGE_Handle *exchange;
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_EXCHANGE_KycStatusCallback cb;
/**
* Closure for @e cb.
*/
void *cb_cls;
/**
* Hash of the payto:// URL that is being KYC'ed.
*/
struct TALER_PaytoHashP h_payto;
};
/**
* Function called when we're done processing the
* HTTP /kyc-check request.
*
* @param cls the `struct TALER_EXCHANGE_KycCheckHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_kyc_check_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_EXCHANGE_KycCheckHandle *kch = cls;
const json_t *j = response;
struct TALER_EXCHANGE_KycStatus ks = {
.http_status = (unsigned int) response_code
};
kch->job = NULL;
switch (response_code)
{
case 0:
ks.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
case MHD_HTTP_OK:
{
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("exchange_sig",
&ks.details.kyc_ok.exchange_sig),
GNUNET_JSON_spec_fixed_auto ("exchange_pub",
&ks.details.kyc_ok.exchange_pub),
GNUNET_JSON_spec_timestamp ("now",
&ks.details.kyc_ok.timestamp),
GNUNET_JSON_spec_end ()
};
const struct TALER_EXCHANGE_Keys *key_state;
struct TALER_ExchangeAccountSetupSuccessPS kyc_purpose = {
.purpose.size = htonl (sizeof (kyc_purpose)),
.purpose.purpose = htonl (
TALER_SIGNATURE_EXCHANGE_ACCOUNT_SETUP_SUCCESS),
.h_payto = kch->h_payto
};
if (GNUNET_OK !=
GNUNET_JSON_parse (j,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
ks.http_status = 0;
ks.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
}
kyc_purpose.timestamp = GNUNET_TIME_timestamp_hton (
ks.details.kyc_ok.timestamp);
key_state = TALER_EXCHANGE_get_keys (kch->exchange);
if (GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (key_state,
&ks.details.kyc_ok.exchange_pub))
{
GNUNET_break_op (0);
ks.http_status = 0;
ks.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
GNUNET_JSON_parse_free (spec);
break;
}
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (
TALER_SIGNATURE_EXCHANGE_ACCOUNT_SETUP_SUCCESS,
&kyc_purpose,
&ks.details.kyc_ok.exchange_sig.eddsa_signature,
&ks.details.kyc_ok.exchange_pub.eddsa_pub))
{
GNUNET_break_op (0);
ks.http_status = 0;
ks.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
GNUNET_JSON_parse_free (spec);
break;
}
kch->cb (kch->cb_cls,
&ks);
GNUNET_JSON_parse_free (spec);
TALER_EXCHANGE_kyc_check_cancel (kch);
return;
}
case MHD_HTTP_ACCEPTED:
{
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("kyc_url",
&ks.details.kyc_url),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (j,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
ks.http_status = 0;
ks.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
break;
}
kch->cb (kch->cb_cls,
&ks);
GNUNET_JSON_parse_free (spec);
TALER_EXCHANGE_kyc_check_cancel (kch);
return;
}
case MHD_HTTP_NO_CONTENT:
break;
case MHD_HTTP_BAD_REQUEST:
ks.ec = TALER_JSON_get_error_code (j);
/* This should never happen, either us or the exchange is buggy
(or API version conflict); just pass JSON reply to the application */
break;
case MHD_HTTP_UNAUTHORIZED:
ks.ec = TALER_JSON_get_error_code (j);
break;
case MHD_HTTP_NOT_FOUND:
ks.ec = TALER_JSON_get_error_code (j);
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
ks.ec = TALER_JSON_get_error_code (j);
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
break;
default:
/* unexpected response code */
GNUNET_break_op (0);
ks.ec = TALER_JSON_get_error_code (j);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u/%d for exchange kyc_check\n",
(unsigned int) response_code,
(int) ks.ec);
break;
}
kch->cb (kch->cb_cls,
&ks);
TALER_EXCHANGE_kyc_check_cancel (kch);
}
struct TALER_EXCHANGE_KycCheckHandle *
TALER_EXCHANGE_kyc_check (struct TALER_EXCHANGE_Handle *exchange,
uint64_t payment_target,
const struct TALER_PaytoHashP *h_payto,
struct GNUNET_TIME_Relative timeout,
TALER_EXCHANGE_KycStatusCallback cb,
void *cb_cls)
{
struct TALER_EXCHANGE_KycCheckHandle *kch;
CURL *eh;
struct GNUNET_CURL_Context *ctx;
char *arg_str;
if (GNUNET_YES !=
TEAH_handle_is_ready (exchange))
{
GNUNET_break (0);
return NULL;
}
{
char payto_str[sizeof (*h_payto) * 2];
char *end;
unsigned long long timeout_ms;
end = GNUNET_STRINGS_data_to_string (
h_payto,
sizeof (*h_payto),
payto_str,
sizeof (payto_str) - 1);
*end = '\0';
timeout_ms = timeout.rel_value_us
/ GNUNET_TIME_UNIT_MILLISECONDS.rel_value_us;
GNUNET_asprintf (&arg_str,
"/kyc-check/%llu?h_payto=%s&timeout_ms=%llu",
(unsigned long long) payment_target,
payto_str,
timeout_ms);
}
kch = GNUNET_new (struct TALER_EXCHANGE_KycCheckHandle);
kch->exchange = exchange;
kch->h_payto = *h_payto;
kch->cb = cb;
kch->cb_cls = cb_cls;
kch->url = TEAH_path_to_url (exchange,
arg_str);
GNUNET_free (arg_str);
if (NULL == kch->url)
{
GNUNET_free (kch);
return NULL;
}
eh = TALER_EXCHANGE_curl_easy_get_ (kch->url);
if (NULL == eh)
{
GNUNET_break (0);
GNUNET_free (kch->url);
GNUNET_free (kch);
return NULL;
}
ctx = TEAH_handle_to_context (exchange);
kch->job = GNUNET_CURL_job_add_with_ct_json (ctx,
eh,
&handle_kyc_check_finished,
kch);
return kch;
}
void
TALER_EXCHANGE_kyc_check_cancel (struct TALER_EXCHANGE_KycCheckHandle *kch)
{
if (NULL != kch->job)
{
GNUNET_CURL_job_cancel (kch->job);
kch->job = NULL;
}
GNUNET_free (kch->url);
GNUNET_free (kch);
}
/* end of exchange_api_kyc_check.c */
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