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/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016, 2020 Taler Systems SA
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, see
<http://www.gnu.org/licenses/>
*/
/**
* @file lib/merchant_api_track_transaction.c
* @brief Implementation of the /track/transaction 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 transactions.
*/
struct TALER_MERCHANT_TrackTransactionHandle
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_TrackTransactionCallback 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/transaction request.
*
* @param cls the `struct TALER_MERCHANT_TrackTransactionHandle`
* @param response_code HTTP response code, 0 on error
* @param json response body, NULL if not in JSON
*/
static void
handle_track_transaction_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_TrackTransactionHandle *tdo = cls;
const json_t *json = response;
struct TALER_MERCHANT_HttpResponse hr = {
.http_status = (unsigned int) response_code,
.reply = json
};
tdo->job = NULL;
switch (response_code)
{
case 0:
hr.ec = TALER_EC_INVALID_RESPONSE;
break;
case MHD_HTTP_OK:
/* FIXME: should we not have a timestamp here as well? */
tdo->cb (tdo->cb_cls,
&hr);
TALER_MERCHANT_track_transaction_cancel (tdo);
return;
case MHD_HTTP_ACCEPTED:
{
/* FIXME: Expect time stamp of when the transfer is supposed to happen
=> Parse it? */
}
break;
case MHD_HTTP_FAILED_DEPENDENCY:
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Exchange gave inconsistent response\n");
TALER_MERCHANT_parse_error_details_ (json,
response_code,
&hr);
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,
"Did not find any data\n");
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
break;
default:
/* unexpected response code */
GNUNET_break_op (0);
TALER_MERCHANT_parse_error_details_ (json,
response_code,
&hr);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u/%d\n",
(unsigned int) response_code,
(int) hr.ec);
break;
}
tdo->cb (tdo->cb_cls,
&hr);
TALER_MERCHANT_track_transaction_cancel (tdo);
}
/**
* Request backend to return transactions associated with a given wtid.
*
* @param ctx execution context
* @param backend_url base URL of the backend
* @param order_id order id pointing to the transaction being tracked
* @param track_transaction_cb the callback to call when a reply for this request is available
* @param track_transaction_cb_cls closure for @a track_transaction_cb
* @return a handle for this request
*/
struct TALER_MERCHANT_TrackTransactionHandle *
TALER_MERCHANT_track_transaction (
struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const char *order_id,
TALER_MERCHANT_TrackTransactionCallback track_transaction_cb,
void *track_transaction_cb_cls)
{
struct TALER_MERCHANT_TrackTransactionHandle *tdo;
CURL *eh;
tdo = GNUNET_new (struct TALER_MERCHANT_TrackTransactionHandle);
tdo->ctx = ctx;
tdo->cb = track_transaction_cb;
tdo->cb_cls = track_transaction_cb_cls;
tdo->url = TALER_url_join (backend_url,
"track/transaction",
"order_id", order_id,
NULL);
if (NULL == tdo->url)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Could not construct request URL.\n");
GNUNET_free (tdo);
return NULL;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Requesting URL '%s'\n",
tdo->url);
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_transaction_finished,
tdo);
return tdo;
}
/**
* Cancel a /track/transaction request. This function cannot be used
* on a request handle if a response is already served for it.
*
* @param tdo handle to the tracking operation being cancelled
*/
void
TALER_MERCHANT_track_transaction_cancel (
struct TALER_MERCHANT_TrackTransactionHandle *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_transaction.c */
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