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/*
This file is part of TALER
(C) 2019, 2020, 2021, 2023, 2024 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation; either version 3, 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file taler-merchant-httpd_config.c
* @brief implement API for querying configuration data of the backend
* @author Florian Dold
*/
#include "platform.h"
#include <jansson.h>
#include <taler/taler_util.h>
#include <taler/taler_json_lib.h>
#include "taler-merchant-httpd.h"
#include "taler-merchant-httpd_config.h"
#include "taler-merchant-httpd_mhd.h"
#include "taler-merchant-httpd_exchanges.h"
/**
* Taler protocol version in the format CURRENT:REVISION:AGE
* as used by GNU libtool. See
* https://www.gnu.org/software/libtool/manual/html_node/Libtool-versioning.html
*
* Please be very careful when updating and follow
* https://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html#Updating-version-info
* precisely. Note that this version has NOTHING to do with the
* release version, and the format is NOT the same that semantic
* versioning uses either.
*
* When changing this version, you likely want to also update
* #MERCHANT_PROTOCOL_CURRENT and #MERCHANT_PROTOCOL_AGE in
* merchant_api_config.c!
*/
#define MERCHANT_PROTOCOL_VERSION "17:0:13"
/**
* Callback on an exchange known to us. Does not warrant
* that the "keys" information is actually available for
* @a exchange.
*
* @param cls closure with `json_t *` array to expand
* @param url base URL of the exchange
* @param exchange internal handle for the exchange
*/
static void
add_exchange (void *cls,
const char *url,
const struct TMH_Exchange *exchange)
{
json_t *xa = cls;
json_t *xi;
xi = GNUNET_JSON_PACK (
GNUNET_JSON_pack_data_auto ("master_pub",
TMH_EXCHANGES_get_master_pub (exchange)),
GNUNET_JSON_pack_string ("currency",
TMH_EXCHANGES_get_currency (exchange)),
GNUNET_JSON_pack_string ("base_url",
url));
GNUNET_assert (NULL != xi);
GNUNET_assert (0 ==
json_array_append_new (xa,
xi));
}
MHD_RESULT
MH_handler_config (const struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
struct TMH_HandlerContext *hc)
{
static struct MHD_Response *response;
static struct GNUNET_TIME_Absolute a;
(void) rh;
(void) hc;
if ( (GNUNET_TIME_absolute_is_past (a)) &&
(NULL != response) )
{
MHD_destroy_response (response);
response = NULL;
}
if (NULL == response)
{
json_t *specs = json_object ();
json_t *exchanges = json_array ();
struct GNUNET_TIME_Timestamp km;
char dat[128];
GNUNET_assert (NULL != specs);
GNUNET_assert (NULL != exchanges);
a = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_DAYS);
/* Round up to next full day to ensure the expiration
time does not become a fingerprint! */
a = GNUNET_TIME_absolute_round_down (a,
GNUNET_TIME_UNIT_DAYS);
a = GNUNET_TIME_absolute_add (a,
GNUNET_TIME_UNIT_DAYS);
/* => /config response stays at most 48h in caches! */
km = GNUNET_TIME_absolute_to_timestamp (a);
TALER_MHD_get_date_string (km.abs_time,
dat);
TMH_exchange_get_trusted (&add_exchange,
exchanges);
for (unsigned int i = 0; i<TMH_num_cspecs; i++)
{
const struct TALER_CurrencySpecification *cspec = &TMH_cspecs[i];
if (TMH_test_exchange_configured_for_currency (cspec->currency))
GNUNET_assert (0 ==
json_object_set_new (specs,
cspec->currency,
TALER_CONFIG_currency_specs_to_json
(
cspec)));
}
response = TALER_MHD_MAKE_JSON_PACK (
GNUNET_JSON_pack_string ("currency",
TMH_currency),
GNUNET_JSON_pack_object_steal ("currencies",
specs),
GNUNET_JSON_pack_array_steal ("exchanges",
exchanges),
GNUNET_JSON_pack_string (
"implementation",
"urn:net:taler:specs:taler-merchant:c-reference"),
GNUNET_JSON_pack_string ("name",
"taler-merchant"),
GNUNET_JSON_pack_string ("version",
MERCHANT_PROTOCOL_VERSION));
GNUNET_break (MHD_YES ==
MHD_add_response_header (response,
MHD_HTTP_HEADER_EXPIRES,
dat));
GNUNET_break (MHD_YES ==
MHD_add_response_header (response,
MHD_HTTP_HEADER_CACHE_CONTROL,
"public,max-age=21600")); /* 6h */
}
return MHD_queue_response (connection,
MHD_HTTP_OK,
response);
}
/* end of taler-merchant-httpd_config.c */
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