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/*
This file is part of TALER
Copyright (C) 2018 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, see
<http://www.gnu.org/licenses/>
*/
/**
* @file lib/merchant_api_check_payment.c
* @brief Implementation of the /check-payment GET request
* @author Christian Grothoff
* @author Marcello Stanisci
* @author Florian Dold
*/
#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 check payment operation handle
*/
struct TALER_MERCHANT_CheckPaymentOperation
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_CheckPaymentCallback 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 GET /check-payment request.
*
* @param cls the `struct TALER_MERCHANT_CheckPaymentOperation`
* @param response_code HTTP response code, 0 on error
* @param json response body, should be NULL
*/
static void
handle_check_payment_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_CheckPaymentOperation *cpo = cls;
struct TALER_Amount refund_amount = { 0 };
int refunded;
const json_t *json = response;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_boolean ("refunded",
&refunded),
TALER_JSON_spec_amount ("refund_amount",
&refund_amount),
GNUNET_JSON_spec_end()
};
cpo->job = NULL;
if (MHD_HTTP_OK != response_code)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Checking payment failed with HTTP status code %u\n",
(unsigned int) response_code);
GNUNET_break_op (0);
cpo->cb (cpo->cb_cls,
response_code,
json,
GNUNET_SYSERR,
GNUNET_SYSERR,
&refund_amount,
NULL);
TALER_MERCHANT_check_payment_cancel (cpo);
return;
}
if (! json_boolean_value (json_object_get (json, "paid")))
{
const char *taler_pay_uri = json_string_value (json_object_get (json, "taler_pay_uri"));
if (NULL == taler_pay_uri)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"no taler_pay_uri in unpaid check-payment response\n");
GNUNET_break_op (0);
cpo->cb (cpo->cb_cls,
0,
json,
GNUNET_SYSERR,
GNUNET_SYSERR,
&refund_amount,
NULL);
} else {
cpo->cb (cpo->cb_cls,
response_code,
json,
GNUNET_NO,
GNUNET_NO,
&refund_amount,
taler_pay_uri);
}
TALER_MERCHANT_check_payment_cancel (cpo);
return;
}
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"check payment failed to parse JSON\n");
GNUNET_break_op (0);
cpo->cb (cpo->cb_cls,
0,
json,
GNUNET_SYSERR,
GNUNET_SYSERR,
&refund_amount,
NULL);
TALER_MERCHANT_check_payment_cancel (cpo);
return;
}
cpo->cb (cpo->cb_cls,
MHD_HTTP_OK,
json,
GNUNET_YES,
refunded,
&refund_amount,
NULL);
GNUNET_JSON_parse_free (spec);
TALER_MERCHANT_check_payment_cancel (cpo);
}
/**
* Issue a /check-payment request to the backend. Checks the status
* of a payment.
*
* @param ctx execution context
* @param backend_url base URL of the merchant backend
* @param instance instance used for the transaction
* @param order_id order id to identify the payment
* @parem resource_url resource URL to identify duplicate payments (can be NULL)
* @parem session_id sesion id for the payment (or NULL if the payment is not bound to a session)
* @param check_payment_cb callback which will work the response gotten from the backend
* @param check_payment_cb_cls closure to pass to @a check_payment_cb
* @return handle for this operation, NULL upon errors
*/
struct TALER_MERCHANT_CheckPaymentOperation *
TALER_MERCHANT_check_payment (struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const char *instance,
const char *order_id,
const char *resource_url,
const char *session_id,
TALER_MERCHANT_CheckPaymentCallback check_payment_cb,
void *check_payment_cb_cls)
{
struct TALER_MERCHANT_CheckPaymentOperation *cpo;
CURL *eh;
GNUNET_assert (NULL != backend_url);
GNUNET_assert (NULL != instance);
GNUNET_assert (NULL != order_id);
cpo = GNUNET_new (struct TALER_MERCHANT_CheckPaymentOperation);
cpo->ctx = ctx;
cpo->cb = check_payment_cb;
cpo->cb_cls = check_payment_cb_cls;
cpo->url = TALER_url_join (backend_url, "/check-payment",
"instance", instance,
"order_id", order_id,
"resource_url", resource_url,
"session_id", session_id,
NULL);
eh = curl_easy_init ();
if (CURLE_OK != curl_easy_setopt (eh,
CURLOPT_URL,
cpo->url))
{
GNUNET_break (0);
return NULL;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"checking payment from %s\n",
cpo->url);
if (NULL == (cpo->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&handle_check_payment_finished,
cpo)))
{
GNUNET_break (0);
return NULL;
}
return cpo;
}
/**
* Cancel a GET /check-payment request.
*
* @param cph handle to the request to be canceled
*/
void
TALER_MERCHANT_check_payment_cancel (struct TALER_MERCHANT_CheckPaymentOperation *cph)
{
if (NULL != cph->job)
{
GNUNET_CURL_job_cancel (cph->job);
cph->job = NULL;
}
GNUNET_free (cph->url);
GNUNET_free (cph);
}
/* end of merchant_api_check_payment.c */
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