exchange/src/exchange-lib/exchange_api_wire_deposits.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, If not, see
<http://www.gnu.org/licenses/>
*/
/**
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* @file exchange-lib/exchange_api_wire_deposits.c
* @brief Implementation of the /wire/deposits 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>
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#include "taler_exchange_service.h"
#include "exchange_api_common.h"
#include "exchange_api_json.h"
#include "exchange_api_context.h"
#include "exchange_api_handle.h"
#include "taler_signatures.h"
/**
* @brief A /wire/deposits Handle
*/
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struct TALER_EXCHANGE_WireDepositsHandle
{
/**
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* The connection to exchange this request handle will use
*/
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struct TALER_EXCHANGE_Handle *exchange;
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct MAC_Job *job;
/**
* Function to call with the result.
*/
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TALER_EXCHANGE_WireDepositsCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Download buffer
*/
struct MAC_DownloadBuffer db;
};
/**
* Function called when we're done processing the
* HTTP /wire/deposits request.
*
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* @param cls the `struct TALER_EXCHANGE_WireDepositsHandle`
* @param eh the curl request handle
*/
static void
handle_wire_deposits_finished (void *cls,
CURL *eh)
{
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struct TALER_EXCHANGE_WireDepositsHandle *wdh = cls;
long response_code;
json_t *json;
wdh->job = NULL;
json = MAC_download_get_result (&wdh->db,
eh,
&response_code);
switch (response_code)
{
case 0:
break;
case MHD_HTTP_OK:
{
json_t *details_j;
struct GNUNET_HashCode h_wire;
struct TALER_Amount total_amount;
struct TALER_MerchantPublicKeyP merchant_pub;
unsigned int num_details;
struct MAJ_Specification spec[] = {
MAJ_spec_fixed_auto ("H_wire", &h_wire),
MAJ_spec_fixed_auto ("merchant_pub", &merchant_pub),
MAJ_spec_amount ("total_amount", &total_amount),
MAJ_spec_json ("details", &details_j),
MAJ_spec_end
};
if (GNUNET_OK !=
MAJ_parse_json (json,
spec))
{
GNUNET_break_op (0);
response_code = 0;
break;
}
num_details = json_array_size (details_j);
{
struct TALER_WireDepositDetails details[num_details];
unsigned int i;
for (i=0;i<num_details;i++)
{
struct TALER_WireDepositDetails *detail = &details[i];
struct json_t *detail_j = json_array_get (details_j, i);
struct MAJ_Specification spec_detail[] = {
MAJ_spec_fixed_auto ("H_contract", &detail->h_contract),
MAJ_spec_amount ("deposit_value", &detail->coin_value),
MAJ_spec_amount ("deposit_fee", &detail->coin_fee),
MAJ_spec_uint64 ("transaction_id", &detail->transaction_id),
MAJ_spec_fixed_auto ("coin_pub", &detail->coin_pub),
MAJ_spec_end
};
if (GNUNET_OK !=
MAJ_parse_json (detail_j,
spec_detail))
{
GNUNET_break_op (0);
response_code = 0;
break;
}
}
if (0 == response_code)
break;
wdh->cb (wdh->cb_cls,
response_code,
json,
&h_wire,
&total_amount,
num_details,
details);
json_decref (json);
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TALER_EXCHANGE_wire_deposits_cancel (wdh);
return;
}
}
break;
case MHD_HTTP_BAD_REQUEST:
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/* 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:
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/* 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:
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/* 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",
response_code);
GNUNET_break (0);
response_code = 0;
break;
}
wdh->cb (wdh->cb_cls,
response_code,
json,
NULL, NULL, 0, NULL);
json_decref (json);
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TALER_EXCHANGE_wire_deposits_cancel (wdh);
}
/**
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* Query the exchange about which transactions were combined
* to create a wire transfer.
*
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* @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
*/
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struct TALER_EXCHANGE_WireDepositsHandle *
TALER_EXCHANGE_wire_deposits (struct TALER_EXCHANGE_Handle *exchange,
const struct TALER_WireTransferIdentifierRawP *wtid,
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TALER_EXCHANGE_WireDepositsCallback cb,
void *cb_cls)
{
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struct TALER_EXCHANGE_WireDepositsHandle *wdh;
struct TALER_EXCHANGE_Context *ctx;
char *buf;
char *path;
CURL *eh;
if (GNUNET_YES !=
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MAH_handle_is_ready (exchange))
{
GNUNET_break (0);
return NULL;
}
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wdh = GNUNET_new (struct TALER_EXCHANGE_WireDepositsHandle);
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,
"/wire/deposits?wtid=%s",
buf);
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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));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_WRITEFUNCTION,
&MAC_download_cb));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_WRITEDATA,
&wdh->db));
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ctx = MAH_handle_to_context (exchange);
wdh->job = MAC_job_add (ctx,
eh,
GNUNET_YES,
&handle_wire_deposits_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
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TALER_EXCHANGE_wire_deposits_cancel (struct TALER_EXCHANGE_WireDepositsHandle *wdh)
{
if (NULL != wdh->job)
{
MAC_job_cancel (wdh->job);
wdh->job = NULL;
}
GNUNET_free_non_null (wdh->db.buf);
GNUNET_free (wdh->url);
GNUNET_free (wdh);
}
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/* end of exchange_api_wire_deposits.c */