2020-02-29 16:42:10 +01:00
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/*
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This file is part of TALER
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Copyright (C) 2014-2020 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_withdraw.c
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2020-04-12 19:22:45 +02:00
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* @brief Implementation of /reserves/$RESERVE_PUB/withdraw requests with blinding/unblinding
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2020-02-29 16:42:10 +01:00
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <jansson.h>
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#include <microhttpd.h> /* just for HTTP status codes */
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#include <gnunet/gnunet_util_lib.h>
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#include <gnunet/gnunet_json_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 Withdraw Handle
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*/
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struct TALER_EXCHANGE_WithdrawHandle
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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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2020-04-12 19:22:45 +02:00
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* Handle for the actual (internal) withdraw operation.
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2020-02-29 16:42:10 +01:00
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*/
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2020-04-12 19:22:45 +02:00
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struct TALER_EXCHANGE_Withdraw2Handle *wh2;
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2020-02-29 16:42:10 +01:00
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/**
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2020-04-12 19:22:45 +02:00
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* Function to call with the result.
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2020-02-29 16:42:10 +01:00
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*/
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2020-04-12 19:22:45 +02:00
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TALER_EXCHANGE_WithdrawCallback cb;
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2020-02-29 16:42:10 +01:00
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/**
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2020-04-12 19:22:45 +02:00
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* Closure for @a cb.
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2020-02-29 16:42:10 +01:00
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*/
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2020-04-12 19:22:45 +02:00
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void *cb_cls;
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2020-02-29 16:42:10 +01:00
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/**
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* Secrets of the planchet.
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*/
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struct TALER_PlanchetSecretsP ps;
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/**
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* Denomination key we are withdrawing.
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*/
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struct TALER_EXCHANGE_DenomPublicKey pk;
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/**
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* Hash of the public key of the coin we are signing.
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*/
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struct GNUNET_HashCode c_hash;
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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 /reserves/$RESERVE_PUB/withdraw request.
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*
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* @param cls the `struct TALER_EXCHANGE_WithdrawHandle`
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2020-04-12 19:22:45 +02:00
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* @param hr HTTP response data
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* @param blind_sig blind signature over the coin, NULL on error
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2020-02-29 16:42:10 +01:00
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*/
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static void
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2020-04-12 19:22:45 +02:00
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handle_reserve_withdraw_finished (
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void *cls,
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const struct TALER_EXCHANGE_HttpResponse *hr,
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const struct GNUNET_CRYPTO_RsaSignature *blind_sig)
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2020-02-29 16:42:10 +01:00
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{
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struct TALER_EXCHANGE_WithdrawHandle *wh = cls;
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2021-10-13 18:52:59 +02:00
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struct TALER_EXCHANGE_WithdrawResponse wr = {
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.hr = *hr
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};
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2020-02-29 16:42:10 +01:00
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2020-04-12 19:22:45 +02:00
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wh->wh2 = NULL;
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2021-10-13 18:52:59 +02:00
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switch (hr->http_status)
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2020-02-29 16:42:10 +01:00
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{
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2021-10-13 18:52:59 +02:00
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case MHD_HTTP_OK:
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2020-02-29 16:42:10 +01:00
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{
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2021-10-13 18:52:59 +02:00
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struct TALER_FreshCoin fc;
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if (GNUNET_OK !=
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TALER_planchet_to_coin (&wh->pk.key,
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blind_sig,
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&wh->ps,
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&wh->c_hash,
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&fc))
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{
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wr.hr.http_status = 0;
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wr.hr.ec = TALER_EC_EXCHANGE_WITHDRAW_UNBLIND_FAILURE;
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break;
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}
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wr.details.success.sig = fc.sig;
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break;
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2020-03-20 02:36:50 +01:00
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}
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2021-10-13 18:52:59 +02:00
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case MHD_HTTP_ACCEPTED:
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wr.details.accepted.payment_target_uuid; // FIXME
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break;
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default:
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break;
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2020-02-29 16:42:10 +01:00
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}
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2021-10-13 18:52:59 +02:00
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wh->cb (wh->cb_cls,
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&wr);
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if (MHD_HTTP_OK == hr->http_status)
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GNUNET_CRYPTO_rsa_signature_free (wr.details.success.sig.rsa_signature);
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2020-04-12 19:22:45 +02:00
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TALER_EXCHANGE_withdraw_cancel (wh);
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2020-02-29 16:42:10 +01:00
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}
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/**
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* Withdraw a coin from the exchange using a /reserve/withdraw request. Note
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* that to ensure that no money is lost in case of hardware failures,
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* the caller must have committed (most of) the arguments to disk
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* before calling, and be ready to repeat the request with the same
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* arguments in case of failures.
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*
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* @param exchange the exchange handle; the exchange must be ready to operate
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* @param pk kind of coin to create
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* @param reserve_priv private key of the reserve to withdraw from
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* @param ps secrets of the planchet
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* caller must have committed this value to disk before the call (with @a pk)
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* @param res_cb the callback to call when the final result for this request is available
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* @param res_cb_cls closure for the above callback
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* @return handle for the operation on success, NULL on error, i.e.
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* if the inputs are invalid (i.e. denomination key not with this exchange).
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* In this case, the callback is not called.
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*/
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struct TALER_EXCHANGE_WithdrawHandle *
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2020-03-17 17:47:53 +01:00
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TALER_EXCHANGE_withdraw (
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struct TALER_EXCHANGE_Handle *exchange,
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const struct TALER_EXCHANGE_DenomPublicKey *pk,
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const struct TALER_ReservePrivateKeyP *reserve_priv,
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const struct TALER_PlanchetSecretsP *ps,
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TALER_EXCHANGE_WithdrawCallback res_cb,
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void *res_cb_cls)
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2020-02-29 16:42:10 +01:00
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{
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struct TALER_PlanchetDetail pd;
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struct TALER_EXCHANGE_WithdrawHandle *wh;
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2020-04-12 19:22:45 +02:00
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wh = GNUNET_new (struct TALER_EXCHANGE_WithdrawHandle);
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wh->exchange = exchange;
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wh->cb = res_cb;
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wh->cb_cls = res_cb_cls;
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wh->pk = *pk;
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wh->ps = *ps;
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2020-02-29 16:42:10 +01:00
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if (GNUNET_OK !=
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TALER_planchet_prepare (&pk->key,
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ps,
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2020-04-12 19:22:45 +02:00
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&wh->c_hash,
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2020-02-29 16:42:10 +01:00
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&pd))
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{
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2020-04-12 20:46:33 +02:00
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GNUNET_break (0);
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2020-04-12 19:22:45 +02:00
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GNUNET_free (wh);
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2020-02-29 16:42:10 +01:00
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return NULL;
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}
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2020-04-12 19:22:45 +02:00
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wh->pk.key.rsa_public_key
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= GNUNET_CRYPTO_rsa_public_key_dup (pk->key.rsa_public_key);
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wh->wh2 = TALER_EXCHANGE_withdraw2 (exchange,
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&pd,
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reserve_priv,
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&handle_reserve_withdraw_finished,
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wh);
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2020-02-29 16:42:10 +01:00
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GNUNET_free (pd.coin_ev);
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return wh;
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}
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/**
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* Cancel a withdraw status request. This function cannot be used
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* on a request handle if a response is already served for it.
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*
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2020-02-29 17:13:43 +01:00
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* @param wh the withdraw sign request handle
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2020-02-29 16:42:10 +01:00
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*/
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void
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TALER_EXCHANGE_withdraw_cancel (struct TALER_EXCHANGE_WithdrawHandle *wh)
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{
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2020-04-12 19:22:45 +02:00
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if (NULL != wh->wh2)
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2020-02-29 16:42:10 +01:00
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{
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2020-04-12 19:22:45 +02:00
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TALER_EXCHANGE_withdraw2_cancel (wh->wh2);
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wh->wh2 = NULL;
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2020-02-29 16:42:10 +01:00
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}
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GNUNET_CRYPTO_rsa_public_key_free (wh->pk.key.rsa_public_key);
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GNUNET_free (wh);
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}
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