427 lines
13 KiB
C
427 lines
13 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_transfers_get.c
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* @brief Implementation of the GET /transfers/ request
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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_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 /transfers/ GET Handle
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*/
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struct TALER_EXCHANGE_TransfersGetHandle
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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_TransfersGetCallback 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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/**
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* We got a #MHD_HTTP_OK response for the /transfers/ request.
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* Check that the response is well-formed and if it is, call the
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* callback. If not, return an error code.
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*
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* This code is very similar to
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* merchant_api_track_transfer.c::check_transfers_get_response_ok.
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* Any changes should likely be reflected there as well.
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*
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* @param wdh handle to the operation
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* @param json response we got
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* @return #GNUNET_OK if we are done and all is well,
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* #GNUNET_SYSERR if the response was bogus
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*/
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static enum GNUNET_GenericReturnValue
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check_transfers_get_response_ok (
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struct TALER_EXCHANGE_TransfersGetHandle *wdh,
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const json_t *json)
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{
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json_t *details_j;
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struct TALER_EXCHANGE_TransferData td;
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struct TALER_Amount total_expected;
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struct TALER_MerchantPublicKeyP merchant_pub;
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struct GNUNET_JSON_Specification spec[] = {
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TALER_JSON_spec_amount_any ("total", &td.total_amount),
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TALER_JSON_spec_amount_any ("wire_fee", &td.wire_fee),
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GNUNET_JSON_spec_fixed_auto ("merchant_pub", &merchant_pub),
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GNUNET_JSON_spec_fixed_auto ("h_payto", &td.h_payto),
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GNUNET_JSON_spec_timestamp ("execution_time", &td.execution_time),
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GNUNET_JSON_spec_json ("deposits", &details_j),
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GNUNET_JSON_spec_fixed_auto ("exchange_sig", &td.exchange_sig),
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GNUNET_JSON_spec_fixed_auto ("exchange_pub", &td.exchange_pub),
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GNUNET_JSON_spec_end ()
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};
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struct TALER_EXCHANGE_HttpResponse hr = {
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.reply = json,
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.http_status = MHD_HTTP_OK
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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 (GNUNET_OK !=
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TALER_amount_set_zero (td.total_amount.currency,
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&total_expected))
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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_EXCHANGE_test_signing_key (
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TALER_EXCHANGE_get_keys (wdh->exchange),
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&td.exchange_pub))
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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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td.details_length = json_array_size (details_j);
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{
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struct GNUNET_HashContext *hash_context;
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struct TALER_TrackTransferDetails *details;
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details = GNUNET_new_array (td.details_length,
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struct TALER_TrackTransferDetails);
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td.details = details;
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hash_context = GNUNET_CRYPTO_hash_context_start ();
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for (unsigned int i = 0; i<td.details_length; i++)
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{
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struct TALER_TrackTransferDetails *detail = &details[i];
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struct json_t *detail_j = json_array_get (details_j, i);
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struct GNUNET_JSON_Specification spec_detail[] = {
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GNUNET_JSON_spec_fixed_auto ("h_contract_terms",
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&detail->h_contract_terms),
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GNUNET_JSON_spec_fixed_auto ("coin_pub", &detail->coin_pub),
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TALER_JSON_spec_amount_any ("deposit_value", &detail->coin_value),
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TALER_JSON_spec_amount_any ("deposit_fee", &detail->coin_fee),
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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 (detail_j,
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spec_detail,
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NULL, NULL)) ||
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(GNUNET_OK !=
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TALER_amount_cmp_currency (&total_expected,
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&detail->coin_value)) ||
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(GNUNET_OK !=
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TALER_amount_cmp_currency (&total_expected,
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&detail->coin_fee)) ||
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(0 >
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TALER_amount_add (&total_expected,
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&total_expected,
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&detail->coin_value)) ||
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(0 >
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TALER_amount_subtract (&total_expected,
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&total_expected,
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&detail->coin_fee)) )
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{
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GNUNET_break_op (0);
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GNUNET_CRYPTO_hash_context_abort (hash_context);
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GNUNET_JSON_parse_free (spec);
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GNUNET_free (details);
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return GNUNET_SYSERR;
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}
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/* build up big hash for signature checking later */
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{
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struct TALER_WireDepositDetailP dd;
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dd.h_contract_terms = detail->h_contract_terms;
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dd.execution_time = GNUNET_TIME_timestamp_hton (td.execution_time);
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dd.coin_pub = detail->coin_pub;
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TALER_amount_hton (&dd.deposit_value,
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&detail->coin_value);
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TALER_amount_hton (&dd.deposit_fee,
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&detail->coin_fee);
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GNUNET_CRYPTO_hash_context_read (hash_context,
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&dd,
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sizeof (dd));
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}
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}
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/* Check signature */
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{
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struct TALER_WireDepositDataPS wdp = {
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.purpose.purpose = htonl (
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TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE_DEPOSIT),
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.purpose.size = htonl (sizeof (wdp)),
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.merchant_pub = merchant_pub,
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.h_payto = td.h_payto
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};
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TALER_amount_hton (&wdp.total,
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&td.total_amount);
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TALER_amount_hton (&wdp.wire_fee,
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&td.wire_fee);
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GNUNET_CRYPTO_hash_context_finish (hash_context,
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&wdp.h_details);
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if (GNUNET_OK !=
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GNUNET_CRYPTO_eddsa_verify (
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TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE_DEPOSIT,
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&wdp,
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&td.exchange_sig.eddsa_signature,
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&td.exchange_pub.eddsa_pub))
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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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GNUNET_free (details);
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return GNUNET_SYSERR;
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}
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}
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if (0 >
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TALER_amount_subtract (&total_expected,
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&total_expected,
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&td.wire_fee))
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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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GNUNET_free (details);
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return GNUNET_SYSERR;
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}
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if (0 !=
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TALER_amount_cmp (&total_expected,
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&td.total_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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GNUNET_free (details);
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return GNUNET_SYSERR;
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}
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wdh->cb (wdh->cb_cls,
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&hr,
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&td);
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GNUNET_free (details);
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}
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GNUNET_JSON_parse_free (spec);
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TALER_EXCHANGE_transfers_get_cancel (wdh);
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return GNUNET_OK;
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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 /transfers/ request.
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*
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* @param cls the `struct TALER_EXCHANGE_TransfersGetHandle`
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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_transfers_get_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_TransfersGetHandle *wdh = cls;
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const json_t *j = response;
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struct TALER_EXCHANGE_HttpResponse hr = {
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.reply = j,
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.http_status = (unsigned int) response_code
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};
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wdh->job = NULL;
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switch (response_code)
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{
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case 0:
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hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
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break;
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case MHD_HTTP_OK:
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if (GNUNET_OK ==
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check_transfers_get_response_ok (wdh,
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j))
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return;
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GNUNET_break_op (0);
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hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
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hr.http_status = 0;
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break;
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case MHD_HTTP_BAD_REQUEST:
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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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hr.ec = TALER_JSON_get_error_code (j);
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hr.hint = TALER_JSON_get_error_hint (j);
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break;
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case MHD_HTTP_FORBIDDEN:
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/* Nothing really to verify, exchange says one of the signatures is
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invalid; as we checked them, this should never happen, we
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should pass the JSON reply to the application */
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hr.ec = TALER_JSON_get_error_code (j);
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hr.hint = TALER_JSON_get_error_hint (j);
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break;
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case MHD_HTTP_NOT_FOUND:
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/* Exchange does not know about transaction;
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we should pass the reply to the application */
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hr.ec = TALER_JSON_get_error_code (j);
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hr.hint = TALER_JSON_get_error_hint (j);
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break;
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case MHD_HTTP_INTERNAL_SERVER_ERROR:
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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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hr.ec = TALER_JSON_get_error_code (j);
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hr.hint = TALER_JSON_get_error_hint (j);
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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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hr.ec = TALER_JSON_get_error_code (j);
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hr.hint = TALER_JSON_get_error_hint (j);
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Unexpected response code %u/%d for transfers get\n",
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(unsigned int) response_code,
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(int) hr.ec);
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break;
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}
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wdh->cb (wdh->cb_cls,
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&hr,
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NULL);
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TALER_EXCHANGE_transfers_get_cancel (wdh);
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}
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/**
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* Query the exchange about which transactions were combined
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* to create a wire transfer.
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*
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* @param exchange exchange to query
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* @param wtid raw wire transfer identifier to get information about
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* @param cb callback to call
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* @param cb_cls closure for @a cb
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* @return handle to cancel operation
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*/
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struct TALER_EXCHANGE_TransfersGetHandle *
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TALER_EXCHANGE_transfers_get (
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struct TALER_EXCHANGE_Handle *exchange,
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const struct TALER_WireTransferIdentifierRawP *wtid,
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TALER_EXCHANGE_TransfersGetCallback cb,
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void *cb_cls)
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{
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struct TALER_EXCHANGE_TransfersGetHandle *wdh;
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struct GNUNET_CURL_Context *ctx;
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CURL *eh;
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char arg_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2 + 32];
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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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wdh = GNUNET_new (struct TALER_EXCHANGE_TransfersGetHandle);
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wdh->exchange = exchange;
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wdh->cb = cb;
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wdh->cb_cls = cb_cls;
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{
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char wtid_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2];
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char *end;
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end = GNUNET_STRINGS_data_to_string (wtid,
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sizeof (struct
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TALER_WireTransferIdentifierRawP),
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wtid_str,
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sizeof (wtid_str));
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*end = '\0';
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GNUNET_snprintf (arg_str,
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sizeof (arg_str),
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"/transfers/%s",
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wtid_str);
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}
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wdh->url = TEAH_path_to_url (wdh->exchange,
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arg_str);
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if (NULL == wdh->url)
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{
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GNUNET_free (wdh);
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return NULL;
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}
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eh = TALER_EXCHANGE_curl_easy_get_ (wdh->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 (wdh->url);
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GNUNET_free (wdh);
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return NULL;
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}
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ctx = TEAH_handle_to_context (exchange);
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wdh->job = GNUNET_CURL_job_add_with_ct_json (ctx,
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eh,
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&handle_transfers_get_finished,
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wdh);
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return wdh;
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}
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/**
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* Cancel wire deposits request. This function cannot be used on a request
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* handle if a response is already served for it.
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*
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* @param wdh the wire deposits request handle
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*/
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void
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TALER_EXCHANGE_transfers_get_cancel (
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struct TALER_EXCHANGE_TransfersGetHandle *wdh)
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{
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if (NULL != wdh->job)
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{
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GNUNET_CURL_job_cancel (wdh->job);
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wdh->job = NULL;
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}
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GNUNET_free (wdh->url);
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GNUNET_free (wdh);
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}
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/* end of exchange_api_transfers_get.c */
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