812 lines
25 KiB
C
812 lines
25 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014-2021 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_refund.c
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* @brief Implementation of the /refund request of the exchange's HTTP API
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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_json_lib.h"
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#include "taler_exchange_service.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 Refund Handle
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*/
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struct TALER_EXCHANGE_RefundHandle
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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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* Context for #TEH_curl_easy_post(). Keeps the data that must
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* persist for Curl to make the upload.
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*/
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struct TALER_CURL_PostContext ctx;
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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_RefundCallback cb;
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/**
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* Closure for @a cb.
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*/
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void *cb_cls;
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/**
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* Hash over the proposal data to identify the contract
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* which is being refunded.
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*/
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struct TALER_PrivateContractHashP h_contract_terms;
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/**
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* The coin's public key. This is the value that must have been
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* signed (blindly) by the Exchange.
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*/
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struct TALER_CoinSpendPublicKeyP coin_pub;
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/**
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* The Merchant's public key. Allows the merchant to later refund
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* the transaction or to inquire about the wire transfer identifier.
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*/
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struct TALER_MerchantPublicKeyP merchant;
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/**
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* Merchant-generated transaction ID for the refund.
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*/
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uint64_t rtransaction_id;
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/**
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* Amount to be refunded, including refund fee charged by the
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* exchange to the customer.
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*/
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struct TALER_Amount refund_amount;
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};
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/**
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* Verify that the signature on the "200 OK" response
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* from the exchange is valid.
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*
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* @param[in,out] rh refund handle (refund fee added)
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* @param json json reply with the signature
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* @param[out] exchange_pub set to the exchange's public key
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* @param[out] exchange_sig set to the exchange's signature
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* @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
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*/
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static enum GNUNET_GenericReturnValue
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verify_refund_signature_ok (struct TALER_EXCHANGE_RefundHandle *rh,
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const json_t *json,
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struct TALER_ExchangePublicKeyP *exchange_pub,
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struct TALER_ExchangeSignatureP *exchange_sig)
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{
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const struct TALER_EXCHANGE_Keys *key_state;
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_fixed_auto ("exchange_sig",
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exchange_sig),
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GNUNET_JSON_spec_fixed_auto ("exchange_pub",
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exchange_pub),
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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 (json,
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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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return GNUNET_SYSERR;
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}
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key_state = TALER_EXCHANGE_get_keys (rh->exchange);
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if (GNUNET_OK !=
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TALER_EXCHANGE_test_signing_key (key_state,
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exchange_pub))
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{
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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if (GNUNET_OK !=
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TALER_exchange_online_refund_confirmation_verify (
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&rh->h_contract_terms,
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&rh->coin_pub,
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&rh->merchant,
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rh->rtransaction_id,
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&rh->refund_amount,
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exchange_pub,
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exchange_sig))
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{
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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return GNUNET_OK;
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}
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/**
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* Verify that the information in the "409 Conflict" response
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* from the exchange is valid and indeed shows that the refund
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* amount requested is too high.
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*
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* @param[in,out] rh refund handle (refund fee added)
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* @param json json reply with the coin transaction history
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* @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
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*/
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static enum GNUNET_GenericReturnValue
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verify_conflict_history_ok (struct TALER_EXCHANGE_RefundHandle *rh,
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const json_t *json)
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{
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json_t *history;
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_json ("history",
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&history),
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GNUNET_JSON_spec_end ()
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};
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size_t len;
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struct TALER_Amount dtotal;
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bool have_deposit;
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struct TALER_Amount rtotal;
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bool have_refund;
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if (GNUNET_OK !=
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GNUNET_JSON_parse (json,
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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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return GNUNET_SYSERR;
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}
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len = json_array_size (history);
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if (0 == len)
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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have_deposit = false;
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have_refund = false;
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for (size_t off = 0; off<len; off++)
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{
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json_t *transaction;
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struct TALER_Amount amount;
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const char *type;
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struct GNUNET_JSON_Specification spec_glob[] = {
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TALER_JSON_spec_amount_any ("amount",
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&amount),
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GNUNET_JSON_spec_string ("type",
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&type),
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GNUNET_JSON_spec_end ()
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};
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transaction = json_array_get (history,
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off);
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if (GNUNET_OK !=
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GNUNET_JSON_parse (transaction,
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spec_glob,
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NULL, NULL))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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if (0 == strcasecmp (type,
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"DEPOSIT"))
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{
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struct TALER_Amount deposit_fee;
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struct TALER_MerchantWireHashP h_wire;
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struct TALER_PrivateContractHashP h_contract_terms;
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struct TALER_AgeCommitmentHash h_age_commitment;
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bool no_hac;
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// struct TALER_ExtensionContractHashP h_extensions; // FIXME!
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struct TALER_DenominationHashP h_denom_pub;
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struct GNUNET_TIME_Timestamp wallet_timestamp;
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struct TALER_MerchantPublicKeyP merchant_pub;
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struct GNUNET_TIME_Timestamp refund_deadline;
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struct TALER_CoinSpendSignatureP sig;
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struct GNUNET_JSON_Specification ispec[] = {
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GNUNET_JSON_spec_fixed_auto ("coin_sig",
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&sig),
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GNUNET_JSON_spec_fixed_auto ("h_contract_terms",
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&h_contract_terms),
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GNUNET_JSON_spec_fixed_auto ("h_wire",
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&h_wire),
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GNUNET_JSON_spec_fixed_auto ("h_denom_pub",
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&h_denom_pub),
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GNUNET_JSON_spec_mark_optional (
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GNUNET_JSON_spec_fixed_auto ("h_age_commitment",
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&h_age_commitment),
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&no_hac),
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GNUNET_JSON_spec_timestamp ("timestamp",
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&wallet_timestamp),
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GNUNET_JSON_spec_timestamp ("refund_deadline",
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&refund_deadline),
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TALER_JSON_spec_amount_any ("deposit_fee",
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&deposit_fee),
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GNUNET_JSON_spec_fixed_auto ("merchant_pub",
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&merchant_pub),
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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 (transaction,
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ispec,
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NULL, NULL))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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if (GNUNET_OK !=
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TALER_wallet_deposit_verify (&amount,
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&deposit_fee,
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&h_wire,
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&h_contract_terms,
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no_hac
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? NULL
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: &h_age_commitment,
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NULL /* FIXME-OEC: h_extensions! */,
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&h_denom_pub,
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wallet_timestamp,
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&merchant_pub,
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refund_deadline,
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&rh->coin_pub,
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&sig))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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if ( (0 != GNUNET_memcmp (&rh->h_contract_terms,
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&h_contract_terms)) ||
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(0 != GNUNET_memcmp (&rh->merchant,
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&merchant_pub)) )
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{
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/* deposit information is about a different merchant/contract */
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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if (have_deposit)
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{
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/* this cannot really happen, but we conservatively support it anyway */
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if (GNUNET_YES !=
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TALER_amount_cmp_currency (&amount,
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&dtotal))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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GNUNET_break (0 <=
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TALER_amount_add (&dtotal,
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&dtotal,
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&amount));
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}
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else
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{
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dtotal = amount;
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have_deposit = true;
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}
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}
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else if (0 == strcasecmp (type,
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"REFUND"))
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{
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struct TALER_MerchantSignatureP sig;
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struct TALER_Amount refund_fee;
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struct TALER_Amount sig_amount;
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struct TALER_PrivateContractHashP h_contract_terms;
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uint64_t rtransaction_id;
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struct TALER_MerchantPublicKeyP merchant_pub;
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struct GNUNET_JSON_Specification ispec[] = {
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TALER_JSON_spec_amount_any ("refund_fee",
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&refund_fee),
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GNUNET_JSON_spec_fixed_auto ("merchant_sig",
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&sig),
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GNUNET_JSON_spec_fixed_auto ("h_contract_terms",
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&h_contract_terms),
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GNUNET_JSON_spec_fixed_auto ("merchant_pub",
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&merchant_pub),
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GNUNET_JSON_spec_uint64 ("rtransaction_id",
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&rtransaction_id),
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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 (transaction,
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ispec,
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NULL, NULL))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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if (0 >
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TALER_amount_add (&sig_amount,
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&refund_fee,
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&amount))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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if (GNUNET_OK !=
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TALER_merchant_refund_verify (&rh->coin_pub,
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&h_contract_terms,
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rtransaction_id,
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&sig_amount,
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&merchant_pub,
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&sig))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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if ( (0 != GNUNET_memcmp (&rh->h_contract_terms,
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&h_contract_terms)) ||
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(0 != GNUNET_memcmp (&rh->merchant,
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&merchant_pub)) )
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{
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/* refund is about a different merchant/contract */
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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if (rtransaction_id == rh->rtransaction_id)
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{
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/* Eh, this shows either a dependency failure or idempotency,
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but must not happen in a conflict reply. Fail! */
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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if (have_refund)
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{
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if (GNUNET_YES !=
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TALER_amount_cmp_currency (&amount,
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&rtotal))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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GNUNET_break (0 <=
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TALER_amount_add (&rtotal,
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&rtotal,
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&amount));
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}
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else
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{
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rtotal = amount;
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have_refund = true;
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}
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}
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else
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{
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/* unexpected type, new version on server? */
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Unexpected type `%s' in response for exchange refund\n",
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type);
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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}
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{
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if (have_refund)
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{
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if (0 >
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TALER_amount_add (&rtotal,
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&rtotal,
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&rh->refund_amount))
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{
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GNUNET_break (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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}
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else
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{
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rtotal = rh->refund_amount;
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}
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}
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if (-1 == TALER_amount_cmp (&dtotal,
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&rtotal))
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{
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/* dtotal < rtotal: good! */
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GNUNET_JSON_parse_free (spec);
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return GNUNET_OK;
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}
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/* this fails to prove a conflict */
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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/**
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* Verify that the information on the "412 Dependency Failed" response
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* from the exchange is valid and indeed shows that there is a refund
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* transaction ID reuse going on.
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*
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* @param[in,out] rh refund handle (refund fee added)
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* @param json json reply with the signature
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* @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
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*/
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static enum GNUNET_GenericReturnValue
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verify_failed_dependency_ok (struct TALER_EXCHANGE_RefundHandle *rh,
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const json_t *json)
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{
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json_t *h;
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json_t *e;
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_json ("history",
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&h),
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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 (json,
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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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return GNUNET_SYSERR;
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}
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if ( (! json_is_array (h)) ||
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(1 != json_array_size (h) ) )
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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e = json_array_get (h, 0);
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{
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struct TALER_Amount amount;
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const char *type;
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struct TALER_MerchantSignatureP sig;
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struct TALER_Amount refund_fee;
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struct TALER_PrivateContractHashP h_contract_terms;
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uint64_t rtransaction_id;
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struct TALER_MerchantPublicKeyP merchant_pub;
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struct GNUNET_JSON_Specification ispec[] = {
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TALER_JSON_spec_amount_any ("amount",
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&amount),
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GNUNET_JSON_spec_string ("type",
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&type),
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TALER_JSON_spec_amount_any ("refund_fee",
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&refund_fee),
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GNUNET_JSON_spec_fixed_auto ("merchant_sig",
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&sig),
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GNUNET_JSON_spec_fixed_auto ("h_contract_terms",
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&h_contract_terms),
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GNUNET_JSON_spec_fixed_auto ("merchant_pub",
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&merchant_pub),
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GNUNET_JSON_spec_uint64 ("rtransaction_id",
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&rtransaction_id),
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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 (e,
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ispec,
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NULL, NULL))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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|
return GNUNET_SYSERR;
|
|
}
|
|
if (GNUNET_OK !=
|
|
TALER_merchant_refund_verify (&rh->coin_pub,
|
|
&h_contract_terms,
|
|
rtransaction_id,
|
|
&amount,
|
|
&merchant_pub,
|
|
&sig))
|
|
{
|
|
GNUNET_break_op (0);
|
|
GNUNET_JSON_parse_free (spec);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
if ( (rtransaction_id != rh->rtransaction_id) ||
|
|
(0 != GNUNET_memcmp (&rh->h_contract_terms,
|
|
&h_contract_terms)) ||
|
|
(0 != GNUNET_memcmp (&rh->merchant,
|
|
&merchant_pub)) ||
|
|
(0 == TALER_amount_cmp (&rh->refund_amount,
|
|
&amount)) )
|
|
{
|
|
GNUNET_break_op (0);
|
|
GNUNET_JSON_parse_free (spec);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
}
|
|
GNUNET_JSON_parse_free (spec);
|
|
return GNUNET_OK;
|
|
}
|
|
|
|
|
|
/**
|
|
* Function called when we're done processing the
|
|
* HTTP /refund request.
|
|
*
|
|
* @param cls the `struct TALER_EXCHANGE_RefundHandle`
|
|
* @param response_code HTTP response code, 0 on error
|
|
* @param response parsed JSON result, NULL on error
|
|
*/
|
|
static void
|
|
handle_refund_finished (void *cls,
|
|
long response_code,
|
|
const void *response)
|
|
{
|
|
struct TALER_EXCHANGE_RefundHandle *rh = cls;
|
|
struct TALER_ExchangePublicKeyP exchange_pub;
|
|
struct TALER_ExchangeSignatureP exchange_sig;
|
|
struct TALER_ExchangePublicKeyP *ep = NULL;
|
|
struct TALER_ExchangeSignatureP *es = NULL;
|
|
const json_t *j = response;
|
|
struct TALER_EXCHANGE_HttpResponse hr = {
|
|
.reply = j,
|
|
.http_status = (unsigned int) response_code
|
|
};
|
|
|
|
rh->job = NULL;
|
|
switch (response_code)
|
|
{
|
|
case 0:
|
|
hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
|
|
break;
|
|
case MHD_HTTP_OK:
|
|
if (GNUNET_OK !=
|
|
verify_refund_signature_ok (rh,
|
|
j,
|
|
&exchange_pub,
|
|
&exchange_sig))
|
|
{
|
|
GNUNET_break_op (0);
|
|
hr.http_status = 0;
|
|
hr.ec = TALER_EC_EXCHANGE_REFUND_INVALID_SIGNATURE_BY_EXCHANGE;
|
|
}
|
|
else
|
|
{
|
|
ep = &exchange_pub;
|
|
es = &exchange_sig;
|
|
}
|
|
break;
|
|
case MHD_HTTP_BAD_REQUEST:
|
|
/* This should never happen, either us or the exchange is buggy
|
|
(or API version conflict); also can happen if the currency
|
|
differs (which we should obviously never support).
|
|
Just pass JSON reply to the application */
|
|
hr.ec = TALER_JSON_get_error_code (j);
|
|
hr.hint = TALER_JSON_get_error_hint (j);
|
|
break;
|
|
case MHD_HTTP_FORBIDDEN:
|
|
/* Nothing really to verify, exchange says one of the signatures is
|
|
invalid; as we checked them, this should never happen, we
|
|
should pass the JSON reply to the application */
|
|
hr.ec = TALER_JSON_get_error_code (j);
|
|
hr.hint = TALER_JSON_get_error_hint (j);
|
|
break;
|
|
case MHD_HTTP_NOT_FOUND:
|
|
/* Nothing really to verify, this should never
|
|
happen, we should pass the JSON reply to the application */
|
|
hr.ec = TALER_JSON_get_error_code (j);
|
|
hr.hint = TALER_JSON_get_error_hint (j);
|
|
break;
|
|
case MHD_HTTP_CONFLICT:
|
|
/* Requested total refunds exceed deposited amount */
|
|
if (GNUNET_OK !=
|
|
verify_conflict_history_ok (rh,
|
|
j))
|
|
{
|
|
GNUNET_break (0);
|
|
hr.http_status = 0;
|
|
hr.ec = TALER_EC_EXCHANGE_REFUND_INVALID_FAILURE_PROOF_BY_EXCHANGE;
|
|
hr.hint = "conflict information provided by exchange is invalid";
|
|
break;
|
|
}
|
|
hr.ec = TALER_JSON_get_error_code (j);
|
|
hr.hint = TALER_JSON_get_error_hint (j);
|
|
break;
|
|
case MHD_HTTP_GONE:
|
|
/* Kind of normal: the money was already sent to the merchant
|
|
(it was too late for the refund). */
|
|
hr.ec = TALER_JSON_get_error_code (j);
|
|
hr.hint = TALER_JSON_get_error_hint (j);
|
|
break;
|
|
case MHD_HTTP_PRECONDITION_FAILED:
|
|
if (GNUNET_OK !=
|
|
verify_failed_dependency_ok (rh,
|
|
j))
|
|
{
|
|
GNUNET_break (0);
|
|
hr.http_status = 0;
|
|
hr.ec = TALER_EC_EXCHANGE_REFUND_INVALID_FAILURE_PROOF_BY_EXCHANGE;
|
|
hr.hint = "failed precondition proof returned by exchange is invalid";
|
|
break;
|
|
}
|
|
/* Two different refund requests were made about the same deposit, but
|
|
carrying identical refund transaction ids. */
|
|
hr.ec = TALER_JSON_get_error_code (j);
|
|
hr.hint = TALER_JSON_get_error_hint (j);
|
|
break;
|
|
case MHD_HTTP_INTERNAL_SERVER_ERROR:
|
|
/* Server had an internal issue; we should retry, but this API
|
|
leaves this to the application */
|
|
hr.ec = TALER_JSON_get_error_code (j);
|
|
hr.hint = TALER_JSON_get_error_hint (j);
|
|
break;
|
|
default:
|
|
/* unexpected response code */
|
|
GNUNET_break_op (0);
|
|
hr.ec = TALER_JSON_get_error_code (j);
|
|
hr.hint = TALER_JSON_get_error_hint (j);
|
|
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
|
|
"Unexpected response code %u/%d for exchange refund\n",
|
|
(unsigned int) response_code,
|
|
hr.ec);
|
|
break;
|
|
}
|
|
rh->cb (rh->cb_cls,
|
|
&hr,
|
|
ep,
|
|
es);
|
|
TALER_EXCHANGE_refund_cancel (rh);
|
|
}
|
|
|
|
|
|
struct TALER_EXCHANGE_RefundHandle *
|
|
TALER_EXCHANGE_refund (
|
|
struct TALER_EXCHANGE_Handle *exchange,
|
|
const struct TALER_Amount *amount,
|
|
const struct TALER_PrivateContractHashP *h_contract_terms,
|
|
const struct TALER_CoinSpendPublicKeyP *coin_pub,
|
|
uint64_t rtransaction_id,
|
|
const struct TALER_MerchantPrivateKeyP *merchant_priv,
|
|
TALER_EXCHANGE_RefundCallback cb,
|
|
void *cb_cls)
|
|
{
|
|
struct TALER_MerchantPublicKeyP merchant_pub;
|
|
struct TALER_MerchantSignatureP merchant_sig;
|
|
struct TALER_EXCHANGE_RefundHandle *rh;
|
|
struct GNUNET_CURL_Context *ctx;
|
|
json_t *refund_obj;
|
|
CURL *eh;
|
|
char arg_str[sizeof (struct TALER_CoinSpendPublicKeyP) * 2 + 32];
|
|
|
|
GNUNET_assert (GNUNET_YES ==
|
|
TEAH_handle_is_ready (exchange));
|
|
GNUNET_CRYPTO_eddsa_key_get_public (&merchant_priv->eddsa_priv,
|
|
&merchant_pub.eddsa_pub);
|
|
TALER_merchant_refund_sign (coin_pub,
|
|
h_contract_terms,
|
|
rtransaction_id,
|
|
amount,
|
|
merchant_priv,
|
|
&merchant_sig);
|
|
{
|
|
char pub_str[sizeof (struct TALER_CoinSpendPublicKeyP) * 2];
|
|
char *end;
|
|
|
|
end = GNUNET_STRINGS_data_to_string (
|
|
coin_pub,
|
|
sizeof (struct TALER_CoinSpendPublicKeyP),
|
|
pub_str,
|
|
sizeof (pub_str));
|
|
*end = '\0';
|
|
GNUNET_snprintf (arg_str,
|
|
sizeof (arg_str),
|
|
"/coins/%s/refund",
|
|
pub_str);
|
|
}
|
|
refund_obj = GNUNET_JSON_PACK (
|
|
TALER_JSON_pack_amount ("refund_amount",
|
|
amount),
|
|
GNUNET_JSON_pack_data_auto ("h_contract_terms",
|
|
h_contract_terms),
|
|
GNUNET_JSON_pack_uint64 ("rtransaction_id",
|
|
rtransaction_id),
|
|
GNUNET_JSON_pack_data_auto ("merchant_pub",
|
|
&merchant_pub),
|
|
GNUNET_JSON_pack_data_auto ("merchant_sig",
|
|
&merchant_sig));
|
|
rh = GNUNET_new (struct TALER_EXCHANGE_RefundHandle);
|
|
rh->exchange = exchange;
|
|
rh->cb = cb;
|
|
rh->cb_cls = cb_cls;
|
|
rh->url = TEAH_path_to_url (exchange,
|
|
arg_str);
|
|
if (NULL == rh->url)
|
|
{
|
|
json_decref (refund_obj);
|
|
GNUNET_free (rh);
|
|
return NULL;
|
|
}
|
|
rh->h_contract_terms = *h_contract_terms;
|
|
rh->coin_pub = *coin_pub;
|
|
rh->merchant = merchant_pub;
|
|
rh->rtransaction_id = rtransaction_id;
|
|
rh->refund_amount = *amount;
|
|
eh = TALER_EXCHANGE_curl_easy_get_ (rh->url);
|
|
if ( (NULL == eh) ||
|
|
(GNUNET_OK !=
|
|
TALER_curl_easy_post (&rh->ctx,
|
|
eh,
|
|
refund_obj)) )
|
|
{
|
|
GNUNET_break (0);
|
|
if (NULL != eh)
|
|
curl_easy_cleanup (eh);
|
|
json_decref (refund_obj);
|
|
GNUNET_free (rh->url);
|
|
GNUNET_free (rh);
|
|
return NULL;
|
|
}
|
|
json_decref (refund_obj);
|
|
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
|
|
"URL for refund: `%s'\n",
|
|
rh->url);
|
|
ctx = TEAH_handle_to_context (exchange);
|
|
rh->job = GNUNET_CURL_job_add2 (ctx,
|
|
eh,
|
|
rh->ctx.headers,
|
|
&handle_refund_finished,
|
|
rh);
|
|
return rh;
|
|
}
|
|
|
|
|
|
void
|
|
TALER_EXCHANGE_refund_cancel (struct TALER_EXCHANGE_RefundHandle *refund)
|
|
{
|
|
if (NULL != refund->job)
|
|
{
|
|
GNUNET_CURL_job_cancel (refund->job);
|
|
refund->job = NULL;
|
|
}
|
|
GNUNET_free (refund->url);
|
|
TALER_curl_easy_post_finished (&refund->ctx);
|
|
GNUNET_free (refund);
|
|
}
|
|
|
|
|
|
/* end of exchange_api_refund.c */
|