298 lines
8.3 KiB
C
298 lines
8.3 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2021 Taler Systems SA
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see
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<http://www.gnu.org/licenses/>
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*/
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/**
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* @file lib/exchange_api_kyc_check.c
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* @brief Implementation of the /kyc-check request
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <microhttpd.h> /* just for HTTP check codes */
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#include <gnunet/gnunet_util_lib.h>
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#include <gnunet/gnunet_curl_lib.h>
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#include "taler_exchange_service.h"
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#include "taler_json_lib.h"
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#include "exchange_api_handle.h"
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#include "taler_signatures.h"
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#include "exchange_api_curl_defaults.h"
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/**
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* @brief A ``/kyc-check`` handle
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*/
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struct TALER_EXCHANGE_KycCheckHandle
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{
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/**
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* The connection to exchange this request handle will use
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*/
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struct TALER_EXCHANGE_Handle *exchange;
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/**
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* The url for this request.
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*/
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char *url;
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/**
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* Handle for the request.
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*/
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struct GNUNET_CURL_Job *job;
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/**
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* Function to call with the result.
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*/
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TALER_EXCHANGE_KycStatusCallback cb;
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/**
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* Closure for @e cb.
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*/
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void *cb_cls;
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/**
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* Hash of the payto:// URL that is being KYC'ed.
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*/
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struct TALER_PaytoHash h_payto;
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};
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/**
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* Function called when we're done processing the
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* HTTP /kyc-check request.
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*
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* @param cls the `struct TALER_EXCHANGE_KycCheckHandle`
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* @param response_code HTTP response code, 0 on error
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* @param response parsed JSON result, NULL on error
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*/
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static void
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handle_kyc_check_finished (void *cls,
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long response_code,
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const void *response)
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{
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struct TALER_EXCHANGE_KycCheckHandle *kch = cls;
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const json_t *j = response;
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struct TALER_EXCHANGE_KycStatus ks = {
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.http_status = (unsigned int) response_code
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};
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kch->job = NULL;
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switch (response_code)
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{
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case 0:
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ks.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
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break;
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case MHD_HTTP_OK:
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{
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_fixed_auto ("exchange_sig",
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&ks.details.kyc_ok.exchange_sig),
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GNUNET_JSON_spec_fixed_auto ("exchange_pub",
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&ks.details.kyc_ok.exchange_pub),
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GNUNET_JSON_spec_timestamp ("now",
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&ks.details.kyc_ok.timestamp),
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GNUNET_JSON_spec_end ()
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};
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const struct TALER_EXCHANGE_Keys *key_state;
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struct TALER_ExchangeAccountSetupSuccessPS kyc_purpose = {
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.purpose.size = htonl (sizeof (kyc_purpose)),
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.purpose.purpose = htonl (
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TALER_SIGNATURE_EXCHANGE_ACCOUNT_SETUP_SUCCESS),
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.h_payto = kch->h_payto
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};
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if (GNUNET_OK !=
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GNUNET_JSON_parse (j,
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spec,
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NULL, NULL))
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{
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GNUNET_break_op (0);
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ks.http_status = 0;
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ks.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
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break;
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}
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kyc_purpose.timestamp = GNUNET_TIME_timestamp_hton (
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ks.details.kyc_ok.timestamp);
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key_state = TALER_EXCHANGE_get_keys (kch->exchange);
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if (GNUNET_OK !=
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TALER_EXCHANGE_test_signing_key (key_state,
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&ks.details.kyc_ok.exchange_pub))
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{
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GNUNET_break_op (0);
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ks.http_status = 0;
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ks.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
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GNUNET_JSON_parse_free (spec);
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break;
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}
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if (GNUNET_OK !=
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GNUNET_CRYPTO_eddsa_verify (
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TALER_SIGNATURE_EXCHANGE_ACCOUNT_SETUP_SUCCESS,
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&kyc_purpose,
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&ks.details.kyc_ok.exchange_sig.eddsa_signature,
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&ks.details.kyc_ok.exchange_pub.eddsa_pub))
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{
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GNUNET_break_op (0);
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ks.http_status = 0;
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ks.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
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GNUNET_JSON_parse_free (spec);
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break;
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}
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kch->cb (kch->cb_cls,
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&ks);
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GNUNET_JSON_parse_free (spec);
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TALER_EXCHANGE_kyc_check_cancel (kch);
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return;
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}
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case MHD_HTTP_ACCEPTED:
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{
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_string ("kyc_url",
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&ks.details.kyc_url),
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GNUNET_JSON_spec_end ()
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};
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if (GNUNET_OK !=
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GNUNET_JSON_parse (j,
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spec,
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NULL, NULL))
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{
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GNUNET_break_op (0);
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ks.http_status = 0;
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ks.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
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break;
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}
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kch->cb (kch->cb_cls,
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&ks);
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GNUNET_JSON_parse_free (spec);
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TALER_EXCHANGE_kyc_check_cancel (kch);
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return;
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}
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case MHD_HTTP_NO_CONTENT:
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break;
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case MHD_HTTP_BAD_REQUEST:
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ks.ec = TALER_JSON_get_error_code (j);
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/* This should never happen, either us or the exchange is buggy
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(or API version conflict); just pass JSON reply to the application */
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break;
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case MHD_HTTP_UNAUTHORIZED:
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ks.ec = TALER_JSON_get_error_code (j);
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break;
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case MHD_HTTP_NOT_FOUND:
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ks.ec = TALER_JSON_get_error_code (j);
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break;
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case MHD_HTTP_INTERNAL_SERVER_ERROR:
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ks.ec = TALER_JSON_get_error_code (j);
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/* Server had an internal issue; we should retry, but this API
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leaves this to the application */
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break;
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default:
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/* unexpected response code */
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GNUNET_break_op (0);
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ks.ec = TALER_JSON_get_error_code (j);
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Unexpected response code %u/%d for exchange kyc_check\n",
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(unsigned int) response_code,
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(int) ks.ec);
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break;
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}
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kch->cb (kch->cb_cls,
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&ks);
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TALER_EXCHANGE_kyc_check_cancel (kch);
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}
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struct TALER_EXCHANGE_KycCheckHandle *
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TALER_EXCHANGE_kyc_check (struct TALER_EXCHANGE_Handle *exchange,
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uint64_t payment_target,
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const struct TALER_PaytoHash *h_payto,
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struct GNUNET_TIME_Relative timeout,
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TALER_EXCHANGE_KycStatusCallback cb,
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void *cb_cls)
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{
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struct TALER_EXCHANGE_KycCheckHandle *kch;
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CURL *eh;
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struct GNUNET_CURL_Context *ctx;
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char *arg_str;
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if (GNUNET_YES !=
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TEAH_handle_is_ready (exchange))
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{
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GNUNET_break (0);
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return NULL;
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}
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{
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char payto_str[sizeof (*h_payto) * 2];
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char *end;
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unsigned long long timeout_ms;
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end = GNUNET_STRINGS_data_to_string (
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h_payto,
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sizeof (*h_payto),
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payto_str,
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sizeof (payto_str) - 1);
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*end = '\0';
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timeout_ms = timeout.rel_value_us
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/ GNUNET_TIME_UNIT_MILLISECONDS.rel_value_us;
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GNUNET_asprintf (&arg_str,
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"/kyc-check/%llu?h_payto=%s&timeout_ms=%llu",
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(unsigned long long) payment_target,
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payto_str,
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timeout_ms);
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}
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kch = GNUNET_new (struct TALER_EXCHANGE_KycCheckHandle);
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kch->exchange = exchange;
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kch->h_payto = *h_payto;
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kch->cb = cb;
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kch->cb_cls = cb_cls;
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kch->url = TEAH_path_to_url (exchange,
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arg_str);
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GNUNET_free (arg_str);
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if (NULL == kch->url)
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{
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GNUNET_free (kch);
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return NULL;
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}
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eh = TALER_EXCHANGE_curl_easy_get_ (kch->url);
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if (NULL == eh)
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{
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GNUNET_break (0);
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GNUNET_free (kch->url);
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GNUNET_free (kch);
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return NULL;
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}
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ctx = TEAH_handle_to_context (exchange);
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kch->job = GNUNET_CURL_job_add_with_ct_json (ctx,
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eh,
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&handle_kyc_check_finished,
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kch);
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return kch;
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}
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void
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TALER_EXCHANGE_kyc_check_cancel (struct TALER_EXCHANGE_KycCheckHandle *kch)
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{
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if (NULL != kch->job)
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{
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GNUNET_CURL_job_cancel (kch->job);
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kch->job = NULL;
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}
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GNUNET_free (kch->url);
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GNUNET_free (kch);
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}
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/* end of exchange_api_kyc_check.c */
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