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/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016 GNUnet e.V. and INRIA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2.1, 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with
TALER; see the file COPYING.LGPL. If not, If not, see
<http://www.gnu.org/licenses/>
*/
/**
* @file lib/merchant_api_track_transfer.c
* @brief Implementation of the /track/transfer request of the
* merchant's HTTP API
* @author Marcello Stanisci
* @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_curl_lib.h>
#include "taler_merchant_service.h"
#include <taler/taler_json_lib.h>
#include <taler/taler_signatures.h>
/**
* @brief A Handle for tracking wire transfers.
*/
struct TALER_MERCHANT_TrackTransferHandle
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_TrackTransferCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
};
/**
* 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
* exchange_api_track_transfer.c::check_track_transfer_response_ok.
* (Except we do not check the signature, as that was done by the
* backend which we trust already.)
* 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_MERCHANT_TrackTransferHandle *wdh,
const json_t *json)
{
json_t *details_j;
struct GNUNET_HashCode h_wire;
struct TALER_Amount total_amount;
struct TALER_MerchantPublicKeyP merchant_pub;
unsigned int num_details;
struct TALER_ExchangePublicKeyP exchange_pub;
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_json ("deposits", &details_j),
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;
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", &detail->h_contract),
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);
return GNUNET_SYSERR;
}
}
wdh->cb (wdh->cb_cls,
MHD_HTTP_OK,
&exchange_pub,
json,
&h_wire,
&total_amount,
num_details,
details);
}
TALER_MERCHANT_track_transfer_cancel (wdh);
return GNUNET_OK;
}
/**
* Function called when we're done processing the
* HTTP /track/transfer request.
*
* @param cls the `struct TALER_MERCHANT_TrackTransferHandle`
* @param response_code HTTP response code, 0 on error
* @param json response body, NULL if not in JSON
*/
static void
handle_track_transfer_finished (void *cls,
long response_code,
const json_t *json)
{
struct TALER_MERCHANT_TrackTransferHandle *tdo = cls;
tdo->job = NULL;
switch (response_code)
{
case 0:
break;
case MHD_HTTP_OK:
if (GNUNET_OK ==
check_track_transfer_response_ok (tdo,
json))
return;
GNUNET_break_op (0);
response_code = 0;
break;
case MHD_HTTP_NOT_FOUND:
/* Nothing really to verify, this should never
happen, we should pass the JSON 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;
}
tdo->cb (tdo->cb_cls,
response_code,
NULL,
json,
NULL,
NULL,
0,
NULL);
TALER_MERCHANT_track_transfer_cancel (tdo);
}
/**
* Request backend to return transfers associated with a given wtid.
*
* @param ctx execution context
* @param backend_uri base URI of the backend
* @param wtid base32 string indicating a wtid
* @param exchange base URL of the exchange in charge of returning the wanted information
* @param tracktransfer_cb the callback to call when a reply for this request is available
* @param tracktransfer_cb_cls closure for @a contract_cb
* @return a handle for this request
*/
struct TALER_MERCHANT_TrackTransferHandle *
TALER_MERCHANT_track_transfer (struct GNUNET_CURL_Context *ctx,
const char *backend_uri,
const struct TALER_WireTransferIdentifierRawP *wtid,
const char *exchange_uri,
TALER_MERCHANT_TrackTransferCallback tracktransfer_cb,
void *tracktransfer_cb_cls)
{
struct TALER_MERCHANT_TrackTransferHandle *tdo;
CURL *eh;
char *wtid_str;
wtid_str = GNUNET_STRINGS_data_to_string_alloc (wtid,
sizeof (struct TALER_WireTransferIdentifierRawP));
tdo = GNUNET_new (struct TALER_MERCHANT_TrackTransferHandle);
tdo->ctx = ctx;
tdo->cb = tracktransfer_cb;
tdo->cb_cls = tracktransfer_cb_cls;
GNUNET_asprintf (&tdo->url,
"%s/track/transfer?wtid=%s&exchange=%s",
backend_uri,
wtid_str,
exchange_uri);
GNUNET_free (wtid_str);
eh = curl_easy_init ();
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
tdo->url));
tdo->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&handle_track_transfer_finished,
tdo);
return tdo;
}
/**
* Cancel a /track/transfer request. This function cannot be used
* on a request handle if a response is already served for it.
*
* @param co the transfer's tracking handle
*/
void
TALER_MERCHANT_track_transfer_cancel (struct TALER_MERCHANT_TrackTransferHandle *tdo)
{
if (NULL != tdo->job)
{
GNUNET_CURL_job_cancel (tdo->job);
tdo->job = NULL;
}
GNUNET_free (tdo->url);
GNUNET_free (tdo);
}
/* end of merchant_api_track_transfer.c */
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