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/*
This file is part of TALER
Copyright (C) 2014-2018 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_query.c
* @brief Implementation of the /tip-query request of the merchant's HTTP API
* @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 handle for tracking /tip-pickup operations
*/
struct TALER_MERCHANT_TipQueryOperation
{
/**
* 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_TipQueryCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
/**
* Expected number of planchets.
*/
unsigned int num_planchets;
};
/**
* We got a 200 response back from the exchange (or the merchant).
* Now we need to parse the response and if it is well-formed,
* call the callback (and set it to NULL afterwards).
*
* @param tqo handle of the original operation
* @param json cryptographic proof returned by the exchange/merchant
* @return #GNUNET_OK if response is valid
*/
static int
check_ok (struct TALER_MERCHANT_TipQueryOperation *tqo,
const json_t *json)
{
struct GNUNET_TIME_Absolute reserve_expiration;
struct TALER_Amount amount_authorized;
struct TALER_Amount amount_available;
struct TALER_Amount amount_picked_up;
struct TALER_ReservePublicKeyP reserve_pub;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("reserve_pub", &reserve_pub),
GNUNET_JSON_spec_absolute_time ("reserve_expiration", &reserve_expiration),
TALER_JSON_spec_amount ("amount_authorized", &amount_authorized),
TALER_JSON_spec_amount ("amount_available", &amount_available),
TALER_JSON_spec_amount ("amount_picked_up", &amount_picked_up),
GNUNET_JSON_spec_end()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
tqo->cb (tqo->cb_cls,
MHD_HTTP_OK,
TALER_JSON_get_error_code (json),
json,
reserve_expiration,
&reserve_pub,
&amount_authorized,
&amount_available,
&amount_picked_up);
return GNUNET_OK;
}
/**
* Function called when we're done processing the
* HTTP /track/transaction request.
*
* @param cls the `struct TALER_MERCHANT_TipQueryOperation`
* @param response_code HTTP response code, 0 on error
* @param json response body, NULL if not in JSON
*/
static void
handle_tip_query_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_TipQueryOperation *tqo = cls;
const json_t *json = response;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Got /tip-query response with status code %u\n",
(unsigned int) response_code);
tqo->job = NULL;
switch (response_code)
{
case MHD_HTTP_OK:
if (GNUNET_OK != check_ok (tqo,
json))
{
GNUNET_break_op (0);
response_code = 0;
}
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
break;
case MHD_HTTP_NOT_FOUND:
/* legal, can happen if instance or tip reserve is unknown */
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;
}
if (MHD_HTTP_OK != response_code)
tqo->cb (tqo->cb_cls,
response_code,
TALER_JSON_get_error_code (json),
json,
GNUNET_TIME_UNIT_ZERO_ABS,
NULL,
NULL,
NULL,
NULL);
TALER_MERCHANT_tip_query_cancel (tqo);
}
/**
* Issue a /tip-query request to the backend. Informs the backend
* that a customer wants to pick up a tip.
*
* @param ctx execution context
* @param backend_url base URL of the merchant backend
* @return handle for this operation, NULL upon errors
*/
struct TALER_MERCHANT_TipQueryOperation *
TALER_MERCHANT_tip_query (struct GNUNET_CURL_Context *ctx,
const char *backend_url,
TALER_MERCHANT_TipQueryCallback query_cb,
void *query_cb_cls)
{
struct TALER_MERCHANT_TipQueryOperation *tqo;
CURL *eh;
tqo = GNUNET_new (struct TALER_MERCHANT_TipQueryOperation);
tqo->ctx = ctx;
tqo->cb = query_cb;
tqo->cb_cls = query_cb_cls;
tqo->url = TALER_url_join (backend_url, "tip-query",
NULL);
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Requesting URL '%s'\n",
tqo->url);
eh = curl_easy_init ();
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
tqo->url));
tqo->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&handle_tip_query_finished,
tqo);
return tqo;
}
/**
* Cancel a /tip-query request. This function cannot be used
* on a request handle if a response is already served for it.
*
* @param tqo handle to the operation being cancelled
*/
void
TALER_MERCHANT_tip_query_cancel (struct TALER_MERCHANT_TipQueryOperation *tqo)
{
if (NULL != tqo->job)
{
GNUNET_CURL_job_cancel (tqo->job);
tqo->job = NULL;
}
GNUNET_free (tqo->url);
GNUNET_free (tqo);
}
/* end of merchant_api_tip_query.c */
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