416 lines
12 KiB
C
416 lines
12 KiB
C
/*
|
|
This file is part of TALER
|
|
Copyright (C) 2014-2020 Taler Systems SA
|
|
|
|
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 lib/exchange_api_transfers_get.c
|
|
* @brief Implementation of the GET /transfers/ request
|
|
* @author Christian Grothoff
|
|
*/
|
|
#include "platform.h"
|
|
#include <jansson.h>
|
|
#include <microhttpd.h> /* just for HTTP status codes */
|
|
#include <gnunet/gnunet_util_lib.h>
|
|
#include <gnunet/gnunet_curl_lib.h>
|
|
#include "taler_exchange_service.h"
|
|
#include "taler_json_lib.h"
|
|
#include "exchange_api_handle.h"
|
|
#include "taler_signatures.h"
|
|
#include "exchange_api_curl_defaults.h"
|
|
|
|
|
|
/**
|
|
* @brief A /transfers/ GET Handle
|
|
*/
|
|
struct TALER_EXCHANGE_TransfersGetHandle
|
|
{
|
|
|
|
/**
|
|
* 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_TransfersGetCallback cb;
|
|
|
|
/**
|
|
* Closure for @a cb.
|
|
*/
|
|
void *cb_cls;
|
|
|
|
};
|
|
|
|
|
|
/**
|
|
* We got a #MHD_HTTP_OK response for the /transfers/ 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_transfers_get_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_transfers_get_response_ok (
|
|
struct TALER_EXCHANGE_TransfersGetHandle *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_Amount total_expected;
|
|
struct TALER_Amount wire_fee;
|
|
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),
|
|
TALER_JSON_spec_amount ("wire_fee", &wire_fee),
|
|
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;
|
|
}
|
|
if (GNUNET_OK !=
|
|
TALER_amount_get_zero (total_amount.currency,
|
|
&total_expected))
|
|
{
|
|
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; i<num_details; i++)
|
|
{
|
|
struct TALER_TrackTransferDetails *detail = &details[i];
|
|
struct json_t *detail_j = json_array_get (details_j, i);
|
|
struct GNUNET_JSON_Specification spec_detail[] = {
|
|
GNUNET_JSON_spec_fixed_auto ("h_contract_terms",
|
|
&detail->h_contract_terms),
|
|
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_contract_terms = detail->h_contract_terms;
|
|
dd.execution_time = GNUNET_TIME_absolute_hton (exec_time);
|
|
dd.coin_pub = detail->coin_pub;
|
|
TALER_amount_hton (&dd.deposit_value,
|
|
&detail->coin_value);
|
|
TALER_amount_hton (&dd.deposit_fee,
|
|
&detail->coin_fee);
|
|
if ( (GNUNET_OK !=
|
|
TALER_amount_add (&total_expected,
|
|
&total_expected,
|
|
&detail->coin_value)) ||
|
|
(GNUNET_OK !=
|
|
TALER_amount_subtract (&total_expected,
|
|
&total_expected,
|
|
&detail->coin_fee)) )
|
|
{
|
|
GNUNET_break_op (0);
|
|
GNUNET_CRYPTO_hash_context_abort (hash_context);
|
|
GNUNET_JSON_parse_free (spec);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
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);
|
|
TALER_amount_hton (&wdp.wire_fee,
|
|
&wire_fee);
|
|
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 != GNUNET_CRYPTO_eddsa_verify
|
|
(TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE_DEPOSIT,
|
|
&wdp.purpose,
|
|
&exchange_sig.eddsa_signature,
|
|
&exchange_pub.eddsa_pub))
|
|
{
|
|
GNUNET_break_op (0);
|
|
GNUNET_JSON_parse_free (spec);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
|
|
if (GNUNET_OK !=
|
|
TALER_amount_subtract (&total_expected,
|
|
&total_expected,
|
|
&wire_fee))
|
|
{
|
|
GNUNET_break_op (0);
|
|
GNUNET_JSON_parse_free (spec);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
if (0 !=
|
|
TALER_amount_cmp (&total_expected,
|
|
&total_amount))
|
|
{
|
|
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,
|
|
&wire_fee,
|
|
num_details,
|
|
details);
|
|
}
|
|
GNUNET_JSON_parse_free (spec);
|
|
TALER_EXCHANGE_transfers_get_cancel (wdh);
|
|
return GNUNET_OK;
|
|
}
|
|
|
|
|
|
/**
|
|
* Function called when we're done processing the
|
|
* HTTP /transfers/ request.
|
|
*
|
|
* @param cls the `struct TALER_EXCHANGE_TransfersGetHandle`
|
|
* @param response_code HTTP response code, 0 on error
|
|
* @param response parsed JSON result, NULL on error
|
|
*/
|
|
static void
|
|
handle_transfers_get_finished (void *cls,
|
|
long response_code,
|
|
const void *response)
|
|
{
|
|
struct TALER_EXCHANGE_TransfersGetHandle *wdh = cls;
|
|
const json_t *j = response;
|
|
enum TALER_ErrorCode ec;
|
|
|
|
wdh->job = NULL;
|
|
switch (response_code)
|
|
{
|
|
case 0:
|
|
ec = TALER_EC_INVALID_RESPONSE;
|
|
break;
|
|
case MHD_HTTP_OK:
|
|
if (GNUNET_OK ==
|
|
check_transfers_get_response_ok (wdh,
|
|
j))
|
|
return;
|
|
GNUNET_break_op (0);
|
|
ec = TALER_EC_TRACK_TRANSFER_REPLY_MALFORMED;
|
|
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 */
|
|
ec = TALER_JSON_get_error_code (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 */
|
|
ec = TALER_JSON_get_error_code (j);
|
|
break;
|
|
case MHD_HTTP_NOT_FOUND:
|
|
/* Exchange does not know about transaction;
|
|
we should pass the reply to the application */
|
|
ec = TALER_JSON_get_error_code (j);
|
|
break;
|
|
case MHD_HTTP_INTERNAL_SERVER_ERROR:
|
|
/* Server had an internal issue; we should retry, but this API
|
|
leaves this to the application */
|
|
ec = TALER_JSON_get_error_code (j);
|
|
break;
|
|
default:
|
|
/* unexpected response code */
|
|
ec = TALER_JSON_get_error_code (j);
|
|
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,
|
|
ec,
|
|
NULL,
|
|
j,
|
|
NULL,
|
|
GNUNET_TIME_UNIT_ZERO_ABS,
|
|
NULL,
|
|
NULL,
|
|
0, NULL);
|
|
TALER_EXCHANGE_transfers_get_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_TransfersGetHandle *
|
|
TALER_EXCHANGE_transfers_get (
|
|
struct TALER_EXCHANGE_Handle *exchange,
|
|
const struct TALER_WireTransferIdentifierRawP *wtid,
|
|
TALER_EXCHANGE_TransfersGetCallback cb,
|
|
void *cb_cls)
|
|
{
|
|
struct TALER_EXCHANGE_TransfersGetHandle *wdh;
|
|
struct GNUNET_CURL_Context *ctx;
|
|
CURL *eh;
|
|
char arg_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2 + 32];
|
|
|
|
if (GNUNET_YES !=
|
|
TEAH_handle_is_ready (exchange))
|
|
{
|
|
GNUNET_break (0);
|
|
return NULL;
|
|
}
|
|
|
|
wdh = GNUNET_new (struct TALER_EXCHANGE_TransfersGetHandle);
|
|
wdh->exchange = exchange;
|
|
wdh->cb = cb;
|
|
wdh->cb_cls = cb_cls;
|
|
|
|
{
|
|
char wtid_str[sizeof (struct TALER_WireTransferIdentifierRawP) * 2];
|
|
char *end;
|
|
|
|
end = GNUNET_STRINGS_data_to_string (wtid,
|
|
sizeof (struct
|
|
TALER_WireTransferIdentifierRawP),
|
|
wtid_str,
|
|
sizeof (wtid_str));
|
|
*end = '\0';
|
|
GNUNET_snprintf (arg_str,
|
|
sizeof (arg_str),
|
|
"/transfers/%s",
|
|
wtid_str);
|
|
}
|
|
wdh->url = TEAH_path_to_url (wdh->exchange,
|
|
arg_str);
|
|
eh = TALER_EXCHANGE_curl_easy_get_ (wdh->url);
|
|
if (NULL == eh)
|
|
{
|
|
GNUNET_break (0);
|
|
GNUNET_free (wdh->url);
|
|
GNUNET_free (wdh);
|
|
return NULL;
|
|
}
|
|
ctx = TEAH_handle_to_context (exchange);
|
|
wdh->job = GNUNET_CURL_job_add (ctx,
|
|
eh,
|
|
GNUNET_YES,
|
|
&handle_transfers_get_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_transfers_get_cancel (
|
|
struct TALER_EXCHANGE_TransfersGetHandle *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_transfers_get.c */
|