/*
This file is part of TALER
Copyright (C) 2014-2021 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 merchant_api_post_order_refund.c
* @brief Implementation of the POST /orders/ID/refund request
* @author Christian Grothoff
* @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 "merchant_api_curl_defaults.h"
#include "merchant_api_common.h"
#include <taler/taler_json_lib.h>
#include <taler/taler_signatures.h>
#include <taler/taler_curl_lib.h>
/**
* Handle for a POST /orders/ID/refund operation.
*/
struct TALER_MERCHANT_OrderRefundHandle
{
/**
* Complete URL where the backend offers /refund
*/
char *url;
/**
* Minor context that holds body and headers.
*/
struct TALER_CURL_PostContext post_ctx;
/**
* The CURL context to connect to the backend
*/
struct GNUNET_CURL_Context *ctx;
/**
* The callback to pass the backend response to
*/
TALER_MERCHANT_RefundCallback cb;
/**
* Clasure to pass to the callback
*/
void *cb_cls;
/**
* Handle for the request
*/
struct GNUNET_CURL_Job *job;
};
/**
* Callback to process POST /orders/ID/refund response
*
* @param cls the `struct TALER_MERCHANT_OrderRefundHandle`
* @param response_code HTTP response code, 0 on error
* @param response response body, NULL if not JSON
*/
static void
handle_refund_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_OrderRefundHandle *orh = cls;
const json_t *json = response;
struct TALER_MERCHANT_HttpResponse hr = {
.http_status = (unsigned int) response_code,
.reply = json
};
orh->job = NULL;
switch (response_code)
{
case 0:
hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
orh->cb (orh->cb_cls,
&hr,
NULL,
NULL);
break;
case MHD_HTTP_OK:
{
const char *taler_refund_uri;
struct TALER_PrivateContractHashP h_contract;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("taler_refund_uri",
&taler_refund_uri),
GNUNET_JSON_spec_fixed_auto ("h_contract",
&h_contract),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
hr.http_status = 0;
hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
orh->cb (orh->cb_cls,
&hr,
NULL,
NULL);
break;
}
orh->cb (orh->cb_cls,
&hr,
taler_refund_uri,
&h_contract);
GNUNET_JSON_parse_free (spec);
}
break;
case MHD_HTTP_UNAUTHORIZED:
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
/* Nothing really to verify, merchant says we need to authenticate. */
break;
case MHD_HTTP_FORBIDDEN:
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
/* Nothing really to verify, merchant says we need to authenticate. */
break;
case MHD_HTTP_NOT_FOUND:
case MHD_HTTP_CONFLICT:
hr.ec = TALER_JSON_get_error_code (json);
hr.hint = TALER_JSON_get_error_hint (json);
orh->cb (orh->cb_cls,
&hr,
NULL,
NULL);
break;
default:
GNUNET_break_op (0); /* unexpected status code */
TALER_MERCHANT_parse_error_details_ (json,
response_code,
&hr);
orh->cb (orh->cb_cls,
&hr,
NULL,
NULL);
break;
}
TALER_MERCHANT_post_order_refund_cancel (orh);
}
void
TALER_MERCHANT_post_order_refund_cancel (
struct TALER_MERCHANT_OrderRefundHandle *orh)
{
if (NULL != orh->job)
{
GNUNET_CURL_job_cancel (orh->job);
orh->job = NULL;
}
TALER_curl_easy_post_finished (&orh->post_ctx);
GNUNET_free (orh->url);
GNUNET_free (orh);
}
struct TALER_MERCHANT_OrderRefundHandle *
TALER_MERCHANT_post_order_refund (struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const char *order_id,
const struct TALER_Amount *refund,
const char *reason,
TALER_MERCHANT_RefundCallback cb,
void *cb_cls)
{
struct TALER_MERCHANT_OrderRefundHandle *orh;
json_t *req;
CURL *eh;
orh = GNUNET_new (struct TALER_MERCHANT_OrderRefundHandle);
orh->ctx = ctx;
orh->cb = cb;
orh->cb_cls = cb_cls;
{
char *path;
GNUNET_asprintf (&path,
"private/orders/%s/refund",
order_id);
orh->url = TALER_url_join (backend_url,
path,
NULL);
GNUNET_free (path);
}
if (NULL == orh->url)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Could not construct request URL.\n");
GNUNET_free (orh);
return NULL;
}
req = GNUNET_JSON_PACK (
TALER_JSON_pack_amount ("refund",
refund),
GNUNET_JSON_pack_string ("reason",
reason));
GNUNET_assert (NULL != req);
eh = TALER_MERCHANT_curl_easy_get_ (orh->url);
if (GNUNET_OK !=
TALER_curl_easy_post (&orh->post_ctx,
eh,
req))
{
GNUNET_break (0);
curl_easy_cleanup (eh);
json_decref (req);
GNUNET_free (orh->url);
GNUNET_free (orh);
return NULL;
}
json_decref (req);
orh->job = GNUNET_CURL_job_add2 (ctx,
eh,
orh->post_ctx.headers,
&handle_refund_finished,
orh);
if (NULL == orh->job)
{
GNUNET_free (orh->url);
GNUNET_free (orh);
return NULL;
}
return orh;
}
/* end of merchant_api_post_order_refund.c */