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/*
This file is part of TALER
Copyright (C) 2014-2017, 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_get_reserves.c
* @brief Implementation of the GET /reserves 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 wire reserves.
*/
struct TALER_MERCHANT_ReservesGetHandle
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_ReservesGetCallback 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 GET /reserves request.
*
* @param cls the `struct TALER_MERCHANT_ReservesGetHandle`
* @param response_code HTTP response code, 0 on error
* @param json response body, NULL if not in JSON
*/
static void
handle_reserves_get_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_ReservesGetHandle *rgh = cls;
const json_t *json = response;
struct TALER_MERCHANT_HttpResponse hr = {
.http_status = (unsigned int) response_code,
.reply = json
};
rgh->job = NULL;
switch (response_code)
{
case 0:
hr.ec = TALER_EC_INVALID_RESPONSE;
break;
case MHD_HTTP_OK:
{
json_t *reserves;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_json ("reserves",
&reserves),
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_INVALID_RESPONSE;
break;
}
else
{
size_t rds_length;
struct TALER_MERCHANT_ReserveSummary *rds;
json_t *reserve;
unsigned int i;
bool ok;
if (! json_is_array (reserves))
{
GNUNET_break_op (0);
GNUNET_JSON_parse_free (spec);
hr.http_status = 0;
hr.ec = TALER_EC_INVALID_RESPONSE;
break;
}
rds_length = json_array_size (reserves);
rds = GNUNET_new_array (rds_length,
struct TALER_MERCHANT_ReserveSummary);
ok = true;
json_array_foreach (reserves, i, reserve) {
struct TALER_MERCHANT_ReserveSummary *rd = &rds[i];
struct GNUNET_JSON_Specification ispec[] = {
GNUNET_JSON_spec_fixed_auto ("reserve_pub",
&rd->reserve_pub),
TALER_JSON_spec_absolute_time ("creation_time",
&rd->creation_time),
TALER_JSON_spec_absolute_time ("expiration_time",
&rd->expiration_time),
TALER_JSON_spec_amount ("merchant_initial_amount",
&rd->merchant_initial_amount),
TALER_JSON_spec_amount ("exchange_initial_amount",
&rd->exchange_initial_amount),
TALER_JSON_spec_amount ("pickup_amount",
&rd->pickup_amount),
TALER_JSON_spec_amount ("committed_amount",
&rd->committed_amount),
GNUNET_JSON_spec_bool ("active",
&rd->active),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (reserve,
ispec,
NULL, NULL))
{
GNUNET_break_op (0);
ok = false;
break;
}
}
if (! ok)
{
GNUNET_break_op (0);
GNUNET_free (rds);
GNUNET_JSON_parse_free (spec);
hr.http_status = 0;
hr.ec = TALER_EC_INVALID_RESPONSE;
break;
}
rgh->cb (rgh->cb_cls,
&hr,
rds_length,
rds);
GNUNET_free (rds);
GNUNET_JSON_parse_free (spec);
TALER_MERCHANT_reserves_get_cancel (rgh);
return;
}
}
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);
response_code = 0;
break;
}
rgh->cb (rgh->cb_cls,
&hr,
0,
NULL);
TALER_MERCHANT_reserves_get_cancel (rgh);
}
/**
* Issue a GET /reserves request to the backend. Informs the backend
* that a customer wants to pick up a reserves.
*
* @param ctx execution context
* @param backend_url base URL of the merchant backend
* @param after filter for reserves created after this date, use 0 for no filtering
* @param active filter for reserves that are active
* @param failures filter for reserves where we disagree about the balance with
* the exchange
* @param cb function to call with the result(s)
* @param cb_cls closure for @a cb
* @return handle for this operation, NULL upon errors
*/
struct TALER_MERCHANT_ReservesGetHandle *
TALER_MERCHANT_reserves_get (struct GNUNET_CURL_Context *ctx,
const char *backend_url,
struct GNUNET_TIME_Absolute after,
enum TALER_EXCHANGE_YesNoAll active,
enum TALER_EXCHANGE_YesNoAll failures,
TALER_MERCHANT_ReservesGetCallback cb,
void *cb_cls)
{
struct TALER_MERCHANT_ReservesGetHandle *rgh;
CURL *eh;
const char *active_s = NULL;
const char *failures_s = NULL;
char *after_s;
rgh = GNUNET_new (struct TALER_MERCHANT_ReservesGetHandle);
rgh->ctx = ctx;
rgh->cb = cb;
rgh->cb_cls = cb_cls;
active_s = TALER_yna_to_string (active);
failures_s = TALER_yna_to_string (failures);
after_s = GNUNET_strdup (GNUNET_STRINGS_absolute_time_to_string (
after));
rgh->url = TALER_url_join (backend_url,
"private/reserves",
"active",
active_s,
"failures",
failures_s,
"after",
after.abs_value_us != 0
? after_s
: NULL,
NULL);
GNUNET_free (after_s);
if (NULL == rgh->url)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Could not construct request URL.\n");
GNUNET_free (rgh);
return NULL;
}
eh = curl_easy_init ();
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
rgh->url));
rgh->job = GNUNET_CURL_job_add (ctx,
eh,
&handle_reserves_get_finished,
rgh);
return rgh;
}
/**
* Cancel a GET /reserves request.
*
* @param rgh handle to the request to be canceled
*/
void
TALER_MERCHANT_reserves_get_cancel (
struct TALER_MERCHANT_ReservesGetHandle *rgh)
{
if (NULL != rgh->job)
{
GNUNET_CURL_job_cancel (rgh->job);
rgh->job = NULL;
}
GNUNET_free (rgh->url);
GNUNET_free (rgh);
}
/* end of merchant_api_get_reserves.c */
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