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/*
This file is part of TALER
Copyright (C) 2014-2017 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_tip_enable.c
* @brief Implementation of the /tip-enable 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>
#include "merchant_api_common.h"
/**
* @brief A handle for tracking transactions.
*/
struct TALER_MERCHANT_TipEnableOperation
{
/**
* The url for this request.
*/
char *url;
/**
* JSON encoding of the request to POST.
*/
char *json_enc;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_TipEnableCallback 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_TipEnableOperation`
* @param response_code HTTP response code, 0 on error
* @param json response body, NULL if not in JSON
*/
static void
handle_tip_enable_finished (void *cls,
long response_code,
const json_t *json)
{
struct TALER_MERCHANT_TipEnableOperation *teo = cls;
teo->job = NULL;
switch (response_code)
{
case MHD_HTTP_OK:
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;
}
teo->cb (teo->cb_cls,
response_code,
TALER_JSON_get_error_code (json));
TALER_MERCHANT_tip_enable_cancel (teo);
}
/**
* Issue a /tip-enable request to the backend. Informs the backend
* that a reserve is now available for tipping. Note that the
* respective @a reserve_priv must also be bound to one or more
* instances (together with the URI of the exchange) via the backend's
* configuration file before it can be used. Usually, the process
* is that one first configures an exchange and a @a reserve_priv for
* an instance, and then enables (or re-enables) the reserve by
* performing wire transfers and informs the backend about it using
* this API.
*
* @param ctx execution context
* @param backend_uri base URL of the merchant backend
* @param amount amount that was credited to the reserve
* @param expiration when will the reserve expire
* @param reserve_priv private key of the reserve
* @param credit_uuid unique ID of the wire transfer
* @param enable_cb callback which will work the response gotten from the backend
* @param enable_cb_cls closure to pass to @a enable_cb
* @return handle for this operation, NULL upon errors
*/
struct TALER_MERCHANT_TipEnableOperation *
TALER_MERCHANT_tip_enable (struct GNUNET_CURL_Context *ctx,
const char *backend_uri,
const struct TALER_Amount *amount,
struct GNUNET_TIME_Absolute expiration,
const struct TALER_ReservePrivateKeyP *reserve_priv,
const struct GNUNET_HashCode *credit_uuid,
TALER_MERCHANT_TipEnableCallback enable_cb,
void *enable_cb_cls)
{
struct TALER_MERCHANT_TipEnableOperation *teo;
CURL *eh;
json_t *te_obj;
(void) GNUNET_TIME_round_abs (&expiration);
teo = GNUNET_new (struct TALER_MERCHANT_TipEnableOperation);
teo->ctx = ctx;
teo->cb = enable_cb;
teo->cb_cls = enable_cb_cls;
teo->url = MAH_path_to_url_ (backend_uri,
"/tip-enable");
te_obj = json_pack ("{"
" s:o," /* amount */
" s:o," /* expiration */
" s:o," /* credit_uuid */
" s:o," /* reserve_priv */
"}",
"credit", TALER_JSON_from_amount (amount),
"expiration", GNUNET_JSON_from_time_abs (expiration),
"credit_uuid", GNUNET_JSON_from_data_auto (credit_uuid),
"reserve_priv", GNUNET_JSON_from_data_auto (reserve_priv));
if (NULL == te_obj)
{
GNUNET_break (0);
GNUNET_free (teo->url);
GNUNET_free (teo);
return NULL;
}
if (NULL == (teo->json_enc =
json_dumps (te_obj,
JSON_COMPACT)))
{
GNUNET_break (0);
json_decref (te_obj);
GNUNET_free (teo->url);
GNUNET_free (teo);
return NULL;
}
json_decref (te_obj);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Requesting URI '%s'\n",
teo->url);
eh = curl_easy_init ();
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
teo->url));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_POSTFIELDS,
teo->json_enc));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_POSTFIELDSIZE,
strlen (teo->json_enc)));
teo->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&handle_tip_enable_finished,
teo);
return teo;
}
/**
* Cancel a /track/transaction request. This function cannot be used
* on a request handle if a response is already served for it.
*
* @param teo handle to the tracking operation being cancelled
*/
void
TALER_MERCHANT_tip_enable_cancel (struct TALER_MERCHANT_TipEnableOperation *teo)
{
if (NULL != teo->job)
{
GNUNET_CURL_job_cancel (teo->job);
teo->job = NULL;
}
GNUNET_free_non_null (teo->json_enc);
GNUNET_free (teo->url);
GNUNET_free (teo);
}
/* end of merchant_api_tip_enable.c */
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