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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_contract.c
* @brief Implementation of the /track/deposit and /track/wtid request of the
* merchant's HTTP API
* @author Marcello Stanisci
*/
#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 Contract Operation Handle
*/
struct TALER_MERCHANT_TrackDepositOperation
{
/**
* The url for this request.
*/
char *url;
/**
* base32 identifier being the 'witd' parameter required by the
* exchange
*/
char *wtid;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_TrackDepositCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
};
/**
* Function called when we're done processing the
* HTTP /track/deposit request.
*
* @param cls the `struct TALER_MERCHANT_TrackDepositOperation`
* @param response_code HTTP response code, 0 on error
* @param json response body, NULL if not in JSON
*/
static void
handle_trackdeposit_finished (void *cls,
long response_code,
const json_t *json) // body
{
struct TALER_MERCHANT_TrackDepositOperation *tdo = cls;
tdo->job = NULL;
switch (response_code)
{
case 0:
break;
case MHD_HTTP_OK:
{
/* Work out argument for external callback from the body .. */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"200 returned from /track/deposit\n");
}
break;
case MHD_HTTP_NOT_FOUND:
/* Nothing really to verify, this should never
happen, we should pass the JSON reply to the application */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"track deposit URI not found\n");
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;
}
/* FIXME figure out wich parameters ought to be passed back */
tdo->cb (tdo->cb_cls,
response_code,
json);
}
/**
* Request backend to return deposits associated with a given wtid.
*
* @param ctx execution context
* @param backend_uri URI of the backend (having /track/deposit appended)
* @param wtid base32 string indicating a wtid
* @param exchange base URL of the exchange in charge of returning the wanted information
* @param trackdeposit_cb the callback to call when a reply for this request is available
* @param trackdeposit_cb_cls closure for @a contract_cb
* @return a handle for this request
*/
struct TALER_MERCHANT_TrackDepositOperation *
TALER_MERCHANT_track_deposit (struct GNUNET_CURL_Context *ctx,
const char *backend_uri,
const struct TALER_WireTransferIdentifierRawP *wtid,
const char *exchange_uri,
TALER_MERCHANT_TrackDepositCallback trackdeposit_cb,
void *trackdeposit_cb_cls)
{
struct TALER_MERCHANT_TrackDepositOperation *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_TrackDepositOperation);
tdo->ctx = ctx;
tdo->cb = trackdeposit_cb;
tdo->cb_cls = trackdeposit_cb_cls;
/* TO BE FREED SOMEWHERE. GOTTEN WITH /track/deposit ALREADY APPENDED */
GNUNET_asprintf (&tdo->url,
"%s?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_trackdeposit_finished,
tdo);
return tdo;
}
/**
* Cancel a /track/deposit request. This function cannot be used
* on a request handle if a response is already served for it.
*
* @param co the deposit's tracking operation
*/
void
TALER_MERCHANT_track_deposit_cancel (struct TALER_MERCHANT_TrackDepositOperation *tdo)
{
if (NULL != tdo->job)
{
GNUNET_CURL_job_cancel (tdo->job);
tdo->job = NULL;
}
GNUNET_free (tdo->url);
GNUNET_free (tdo->wtid);
GNUNET_free (tdo);
}
/* end of merchant_api_track.c */
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