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exchange/src/exchange-lib/exchange_api_track_transaction.c

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/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016 GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see
<http://www.gnu.org/licenses/>
*/
/**
* @file exchange-lib/exchange_api_track_transaction.c
* @brief Implementation of the /track/transaction request of the exchange's HTTP API
* @author Christian Grothoff
*/
#include "platform.h"
#include <curl/curl.h>
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP status codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_json_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_json_lib.h"
#include "taler_exchange_service.h"
#include "exchange_api_handle.h"
#include "taler_signatures.h"
/**
* @brief A Deposit Wtid Handle
*/
struct TALER_EXCHANGE_TrackTransactionHandle
{
/**
* The connection to exchange this request handle will use
*/
struct TALER_EXCHANGE_Handle *exchange;
/**
* The url for this request.
*/
char *url;
/**
* JSON encoding of the request to POST.
*/
char *json_enc;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_EXCHANGE_TrackTransactionCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Information the exchange should sign in response.
* (with pre-filled fields from the request).
*/
struct TALER_ConfirmWirePS depconf;
};
/**
* Verify that the signature on the "200 OK" response
* from the exchange is valid.
*
* @param dwh deposit wtid handle
* @param json json reply with the signature
* @param[out] exchange_pub set to the exchange's public key
* @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
*/
static int
verify_deposit_wtid_signature_ok (const struct TALER_EXCHANGE_TrackTransactionHandle *dwh,
const json_t *json,
struct TALER_ExchangePublicKeyP *exchange_pub)
{
struct TALER_ExchangeSignatureP exchange_sig;
const struct TALER_EXCHANGE_Keys *key_state;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig),
GNUNET_JSON_spec_fixed_auto ("exchange_pub", exchange_pub),
GNUNET_JSON_spec_end()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
key_state = TALER_EXCHANGE_get_keys (dwh->exchange);
if (GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (key_state,
exchange_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE,
&dwh->depconf.purpose,
&exchange_sig.eddsa_signature,
&exchange_pub->eddsa_pub))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Function called when we're done processing the
* HTTP /track/transaction request.
*
* @param cls the `struct TALER_EXCHANGE_TrackTransactionHandle`
* @param response_code HTTP response code, 0 on error
* @param json parsed JSON result, NULL on error
*/
static void
handle_deposit_wtid_finished (void *cls,
long response_code,
const json_t *json)
{
struct TALER_EXCHANGE_TrackTransactionHandle *dwh = cls;
const struct TALER_WireTransferIdentifierRawP *wtid = NULL;
struct GNUNET_TIME_Absolute execution_time = GNUNET_TIME_UNIT_FOREVER_ABS;
const struct TALER_Amount *coin_contribution = NULL;
struct TALER_Amount coin_contribution_s;
struct TALER_ExchangePublicKeyP exchange_pub;
struct TALER_ExchangePublicKeyP *ep = NULL;
dwh->job = NULL;
switch (response_code)
{
case 0:
break;
case MHD_HTTP_OK:
{
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("wtid", &dwh->depconf.wtid),
GNUNET_JSON_spec_absolute_time ("execution_time", &execution_time),
TALER_JSON_spec_amount ("coin_contribution", &coin_contribution_s),
GNUNET_JSON_spec_end()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
response_code = 0;
break;
}
wtid = &dwh->depconf.wtid;
dwh->depconf.execution_time = GNUNET_TIME_absolute_hton (execution_time);
TALER_amount_hton (&dwh->depconf.coin_contribution,
&coin_contribution_s);
coin_contribution = &coin_contribution_s;
if (GNUNET_OK !=
verify_deposit_wtid_signature_ok (dwh,
json,
&exchange_pub))
{
GNUNET_break_op (0);
response_code = 0;
}
else
{
ep = &exchange_pub;
}
}
break;
case MHD_HTTP_ACCEPTED:
{
/* Transaction known, but not executed yet */
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_absolute_time ("execution_time", &execution_time),
GNUNET_JSON_spec_end()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
response_code = 0;
break;
}
}
break;
case MHD_HTTP_BAD_REQUEST:
/* This should never happen, either us or the exchange is buggy
(or API version conflict); just pass JSON reply to the application */
break;
case MHD_HTTP_UNAUTHORIZED:
/* 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 */
break;
case MHD_HTTP_NOT_FOUND:
/* Exchange does not know about transaction;
we should pass the reply to the application */
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
break;
default:
/* unexpected response code */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u\n",
(unsigned int) response_code);
GNUNET_break (0);
response_code = 0;
break;
}
dwh->cb (dwh->cb_cls,
response_code,
TALER_JSON_get_error_code (json),
ep,
json,
wtid,
execution_time,
coin_contribution);
TALER_EXCHANGE_track_transaction_cancel (dwh);
}
/**
* Obtain wire transfer details about an existing deposit operation.
*
* @param exchange the exchange to query
* @param merchant_priv the merchant's private key
* @param h_wire hash of merchant's wire transfer details
* @param h_contract_terms hash of the proposal data from the contract
* between merchant and customer
* @param coin_pub public key of the coin
* @param cb function to call with the result
* @param cb_cls closure for @a cb
* @return handle to abort request
*/
struct TALER_EXCHANGE_TrackTransactionHandle *
TALER_EXCHANGE_track_transaction (struct TALER_EXCHANGE_Handle *exchange,
const struct TALER_MerchantPrivateKeyP *merchant_priv,
const struct GNUNET_HashCode *h_wire,
const struct GNUNET_HashCode *h_contract_terms,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
TALER_EXCHANGE_TrackTransactionCallback cb,
void *cb_cls)
{
struct TALER_DepositTrackPS dtp;
struct TALER_MerchantSignatureP merchant_sig;
struct TALER_EXCHANGE_TrackTransactionHandle *dwh;
struct GNUNET_CURL_Context *ctx;
json_t *deposit_wtid_obj;
CURL *eh;
if (GNUNET_YES !=
MAH_handle_is_ready (exchange))
{
GNUNET_break (0);
return NULL;
}
dtp.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_TRACK_TRANSACTION);
dtp.purpose.size = htonl (sizeof (dtp));
dtp.h_contract_terms = *h_contract_terms;
dtp.h_wire = *h_wire;
GNUNET_CRYPTO_eddsa_key_get_public (&merchant_priv->eddsa_priv,
&dtp.merchant.eddsa_pub);
dtp.coin_pub = *coin_pub;
GNUNET_assert (GNUNET_OK ==
GNUNET_CRYPTO_eddsa_sign (&merchant_priv->eddsa_priv,
&dtp.purpose,
&merchant_sig.eddsa_sig));
deposit_wtid_obj = json_pack ("{s:o, s:o," /* H_wire, h_contract_terms */
" s:o," /* coin_pub */
" s:o, s:o}", /* merchant_pub, merchant_sig */
"H_wire", GNUNET_JSON_from_data_auto (h_wire),
"h_contract_terms", GNUNET_JSON_from_data_auto (h_contract_terms),
"coin_pub", GNUNET_JSON_from_data_auto (coin_pub),
"merchant_pub", GNUNET_JSON_from_data_auto (&dtp.merchant),
"merchant_sig", GNUNET_JSON_from_data_auto (&merchant_sig));
if (NULL == deposit_wtid_obj)
{
GNUNET_break (0);
return NULL;
}
dwh = GNUNET_new (struct TALER_EXCHANGE_TrackTransactionHandle);
dwh->exchange = exchange;
dwh->cb = cb;
dwh->cb_cls = cb_cls;
dwh->url = MAH_path_to_url (exchange, "/track/transaction");
dwh->depconf.purpose.size = htonl (sizeof (struct TALER_ConfirmWirePS));
dwh->depconf.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE);
dwh->depconf.h_wire = *h_wire;
dwh->depconf.h_contract_terms = *h_contract_terms;
dwh->depconf.coin_pub = *coin_pub;
eh = curl_easy_init ();
GNUNET_assert (NULL != (dwh->json_enc =
json_dumps (deposit_wtid_obj,
JSON_COMPACT)));
json_decref (deposit_wtid_obj);
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
dwh->url));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_POSTFIELDS,
dwh->json_enc));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_POSTFIELDSIZE,
strlen (dwh->json_enc)));
ctx = MAH_handle_to_context (exchange);
dwh->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&handle_deposit_wtid_finished,
dwh);
return dwh;
}
/**
* Cancel deposit wtid request. This function cannot be used on a request
* handle if a response is already served for it.
*
* @param dwh the wire deposits request handle
*/
void
TALER_EXCHANGE_track_transaction_cancel (struct TALER_EXCHANGE_TrackTransactionHandle *dwh)
{
if (NULL != dwh->job)
{
GNUNET_CURL_job_cancel (dwh->job);
dwh->job = NULL;
}
GNUNET_free (dwh->url);
GNUNET_free (dwh->json_enc);
GNUNET_free (dwh);
}
/* end of exchange_api_deposit_wtid.c */
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