/*
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
*/
/**
* @file exchange-lib/exchange_api_track_transfer.c
* @brief Implementation of the /track/transfer request of the exchange's HTTP API
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include
#include /* just for HTTP status codes */
#include
#include
#include "taler_exchange_service.h"
#include "taler_json_lib.h"
#include "exchange_api_handle.h"
#include "taler_signatures.h"
/**
* @brief A /track/transfer Handle
*/
struct TALER_EXCHANGE_TrackTransferHandle
{
/**
* The connection to exchange this request handle will use
*/
struct TALER_EXCHANGE_Handle *exchange;
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_EXCHANGE_TrackTransferCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
};
/**
* We got a #MHD_HTTP_OK response for the /track/transfer request.
* Check that the response is well-formed and if it is, call the
* callback. If not, return an error code.
*
* This code is very similar to
* merchant_api_track_transfer.c::check_track_transfer_response_ok.
* Any changes should likely be reflected there as well.
*
* @param wdh handle to the operation
* @param json response we got
* @return #GNUNET_OK if we are done and all is well,
* #GNUNET_SYSERR if the response was bogus
*/
static int
check_track_transfer_response_ok (struct TALER_EXCHANGE_TrackTransferHandle *wdh,
const json_t *json)
{
json_t *details_j;
struct GNUNET_HashCode h_wire;
struct GNUNET_TIME_Absolute exec_time;
struct TALER_Amount total_amount;
struct TALER_MerchantPublicKeyP merchant_pub;
unsigned int num_details;
struct TALER_ExchangePublicKeyP exchange_pub;
struct TALER_ExchangeSignatureP exchange_sig;
struct GNUNET_JSON_Specification spec[] = {
TALER_JSON_spec_amount ("total", &total_amount),
GNUNET_JSON_spec_fixed_auto ("merchant_pub", &merchant_pub),
GNUNET_JSON_spec_fixed_auto ("H_wire", &h_wire),
GNUNET_JSON_spec_absolute_time ("execution_time", &exec_time),
GNUNET_JSON_spec_json ("deposits", &details_j),
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;
}
num_details = json_array_size (details_j);
{
struct TALER_TrackTransferDetails details[num_details];
unsigned int i;
struct GNUNET_HashContext *hash_context;
struct TALER_WireDepositDetailP dd;
struct TALER_WireDepositDataPS wdp;
hash_context = GNUNET_CRYPTO_hash_context_start ();
for (i=0;ih_proposal_data),
GNUNET_JSON_spec_uint64 ("transaction_id", &detail->transaction_id),
GNUNET_JSON_spec_fixed_auto ("coin_pub", &detail->coin_pub),
TALER_JSON_spec_amount ("deposit_value", &detail->coin_value),
TALER_JSON_spec_amount ("deposit_fee", &detail->coin_fee),
GNUNET_JSON_spec_end()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (detail_j,
spec_detail,
NULL, NULL))
{
GNUNET_break_op (0);
GNUNET_CRYPTO_hash_context_abort (hash_context);
GNUNET_JSON_parse_free (spec);
return GNUNET_SYSERR;
}
/* build up big hash for signature checking later */
dd.h_proposal_data = detail->h_proposal_data;
dd.execution_time = GNUNET_TIME_absolute_hton (exec_time);
dd.transaction_id = GNUNET_htonll (detail->transaction_id);
dd.coin_pub = detail->coin_pub;
TALER_amount_hton (&dd.deposit_value,
&detail->coin_value);
TALER_amount_hton (&dd.deposit_fee,
&detail->coin_fee);
GNUNET_CRYPTO_hash_context_read (hash_context,
&dd,
sizeof (struct TALER_WireDepositDetailP));
}
/* Check signature */
wdp.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE_DEPOSIT);
wdp.purpose.size = htonl (sizeof (struct TALER_WireDepositDataPS));
TALER_amount_hton (&wdp.total,
&total_amount);
wdp.merchant_pub = merchant_pub;
wdp.h_wire = h_wire;
GNUNET_CRYPTO_hash_context_finish (hash_context,
&wdp.h_details);
if (GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (TALER_EXCHANGE_get_keys (wdh->exchange),
&exchange_pub))
{
GNUNET_break_op (0);
GNUNET_JSON_parse_free (spec);
return GNUNET_SYSERR;
}
if (GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (TALER_EXCHANGE_get_keys (wdh->exchange),
&exchange_pub))
{
GNUNET_break_op (0);
GNUNET_JSON_parse_free (spec);
return GNUNET_SYSERR;
}
wdh->cb (wdh->cb_cls,
MHD_HTTP_OK,
TALER_EC_NONE,
&exchange_pub,
json,
&h_wire,
exec_time,
&total_amount,
num_details,
details);
}
GNUNET_JSON_parse_free (spec);
TALER_EXCHANGE_track_transfer_cancel (wdh);
return GNUNET_OK;
}
/**
* Function called when we're done processing the
* HTTP /track/transfer request.
*
* @param cls the `struct TALER_EXCHANGE_TrackTransferHandle`
* @param response_code HTTP response code, 0 on error
* @param json parsed JSON result, NULL on error
*/
static void
handle_track_transfer_finished (void *cls,
long response_code,
const json_t *json)
{
struct TALER_EXCHANGE_TrackTransferHandle *wdh = cls;
wdh->job = NULL;
switch (response_code)
{
case 0:
break;
case MHD_HTTP_OK:
if (GNUNET_OK ==
check_track_transfer_response_ok (wdh,
json))
return;
GNUNET_break_op (0);
response_code = 0;
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;
}
wdh->cb (wdh->cb_cls,
response_code,
TALER_JSON_get_error_code (json),
NULL,
json,
NULL,
GNUNET_TIME_UNIT_ZERO_ABS,
NULL,
0, NULL);
TALER_EXCHANGE_track_transfer_cancel (wdh);
}
/**
* Query the exchange about which transactions were combined
* to create a wire transfer.
*
* @param exchange exchange to query
* @param wtid raw wire transfer identifier to get information about
* @param cb callback to call
* @param cb_cls closure for @a cb
* @return handle to cancel operation
*/
struct TALER_EXCHANGE_TrackTransferHandle *
TALER_EXCHANGE_track_transfer (struct TALER_EXCHANGE_Handle *exchange,
const struct TALER_WireTransferIdentifierRawP *wtid,
TALER_EXCHANGE_TrackTransferCallback cb,
void *cb_cls)
{
struct TALER_EXCHANGE_TrackTransferHandle *wdh;
struct GNUNET_CURL_Context *ctx;
char *buf;
char *path;
CURL *eh;
if (GNUNET_YES !=
MAH_handle_is_ready (exchange))
{
GNUNET_break (0);
return NULL;
}
wdh = GNUNET_new (struct TALER_EXCHANGE_TrackTransferHandle);
wdh->exchange = exchange;
wdh->cb = cb;
wdh->cb_cls = cb_cls;
buf = GNUNET_STRINGS_data_to_string_alloc (wtid,
sizeof (struct TALER_WireTransferIdentifierRawP));
GNUNET_asprintf (&path,
"/track/transfer?wtid=%s",
buf);
wdh->url = MAH_path_to_url (wdh->exchange,
path);
GNUNET_free (buf);
GNUNET_free (path);
eh = curl_easy_init ();
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
wdh->url));
ctx = MAH_handle_to_context (exchange);
wdh->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&handle_track_transfer_finished,
wdh);
return wdh;
}
/**
* Cancel wire deposits request. This function cannot be used on a request
* handle if a response is already served for it.
*
* @param wdh the wire deposits request handle
*/
void
TALER_EXCHANGE_track_transfer_cancel (struct TALER_EXCHANGE_TrackTransferHandle *wdh)
{
if (NULL != wdh->job)
{
GNUNET_CURL_job_cancel (wdh->job);
wdh->job = NULL;
}
GNUNET_free (wdh->url);
GNUNET_free (wdh);
}
/* end of exchange_api_wire_deposits.c */